JPH0518522A - Combustion control method for garbage incinerator - Google Patents

Abstract

PURPOSE:To control burning condition of garbage more properly by controlling the stroke of a garbage extruder based on the temperature of an exhaust gas generated from the burning of the garbage. CONSTITUTION:The quality of garbage is set in percentage with a garbage setting dial 27 as input variable. The temperature of an exhaust gas is measured with an exhaust gas temperature sensor 12, an amount of the exhaust gas is measured with an amount of exhaust gas detection sensor 24 and an amount of the garbage fed into a hopper is measured with a garbage feeding quantity sensor 26. Resulting measured values are inputted into a fuzzy inferance engine 29 through a signal converter. Preceding extrusion stroke outputted from the fuzzy inference engine 29 is fed back to be inputted into the fuzzy inference engine 29 through a signal converter. Then, a fuzzy inference is performed to output an extrusion stroke under fixed conditions of interval. Thus, the supply of garbage with the maximum contribution rate to the burning condition of the garbage is operated directly thereby enabling the controlling of the burning condition of the garbage more properly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control method for a refuse combustion furnace which optimally controls the combustion state of the refuse in the refuse combustion furnace.

[0002]

2. Description of the Related Art Generally, combustible waste discharged from homes is collected and incinerated in a refuse incinerator as disclosed in, for example, JP-A-3-28617. Generally, such an incinerator has a hopper to which waste is supplied by a waste crane (not shown), a hopper chute that guides the waste from the hopper, and a waste extruder that transfers the waste of the hopper chute. It is provided with a dust device, a drying stoker that dries the dust supplied by the dust feeding device, a combustion stoker that burns the dust from the drying stoker, and a post-combustion stoker that burns the dust from the burning stoker and burns it. The above-mentioned waste extruder is composed of upper and lower two stages and is provided in the lower part of the hopper chute. The dry stoker, the combustion stoker, and the post-combustion stoker are housed in the furnace body, and an exhaust port for discharging combustion gas is formed at the upper end of the furnace body.

Then, the waste is transferred from the hopper chute to the dry stoker by the waste extruder, and the waste is transferred forward while being stirred and disentangled in the dry stoker, and is conveyed from the dry stoker to the combustion stoker. The combustion stoker is burned while being stirred and unraveled, transferred to the front and conveyed to the post-combustion stoker. Here, the amount of waste to be supplied to the waste incinerator is a factor that controls the combustion state by the extrusion stroke of the waste extruder. The amount of refuse supplied depends on the quality of the waste, the temperature of the exhaust gas, the amount of the exhaust gas, and the amount of the waste input, which influence the combustion state.
It is set empirically by human judgment, and is adjusted by the length of the interval at which the dust extruder operates intermittently and the operating speed of the dust extruder under the condition that the extrusion stroke of the dust extruder is constant.

Waste is supplied to the refuse incinerator, and the combustion shifts to a steady state through an unsteady state (during start-up). However, in the unsteady state of the combustion of waste, the temperature of the burner-free incinerator is raised by a burner. After that, garbage is fed and burned. When the combustion is in a non-steady state, while keeping the amount of refuse supplied at the same level, the operating speed of the refuse extruder, for example, is controlled in accordance with the temperature increase of the burner to slow down or speed up the waste feed. It has been determined that the combustion shifts to a steady state when the exhaust gas temperature reaches a predetermined temperature after the waste is fed.

Then, in order to control the combustion of the waste in the waste incinerator, for example, the following operations can be mentioned. (1) By adjusting the waste feed speed of the waste extruder, drying stoker, combustion stoker, and post-combustion stoker until the waste sent to the waste incinerator is dried and burned to ash,
The unburned waste in the waste incinerator is reduced by controlling the processing time until the waste becomes ash according to the combustion state of the waste.

(2) The amount of air required to burn the refuse in the refuse incinerator is sent to stabilize the exhaust gas. (3) The amount of air distributed to each of these stokers is adjusted according to the amount of waste on the dry stoker, the burner stoker, and the post-burner stoker.

(4) The temperature of the combustion air is raised to a temperature required for drying and burning the dust according to the quality of the dust.

[0008]

However, the amount of waste supplied is adjusted by the length of the interval at which the waste extruder operates intermittently and the operating speed of the waste extruder under the condition that the extrusion stroke of the waste extruder is constant. Since it has been
When the state of combustion of waste is unsteady, for example, if the amount of waste supplied intermittently and in large quantities is too large for the required amount of heat, incomplete combustion occurs, and if the quantity of waste supplied is too small. , Burnout may occur.

Further, the quality of the waste that is put into the hopper of the waste incinerator is unstable, such as the amount of heat and properties, and the combustion state due to the waste cannot be predicted. So, for example,
A good combustion unsteady state can be obtained when the waste quality is good and it is easy to burn, but it is possible to secure a normal combustion unsteady state when the dust quality is high and the density is high in the summer. could not.

Then, the refuse supply amount is controlled and the combustion state is changed by judging whether the exhaust gas temperature or the exhaust gas amount as a result of burning the waste in the waste incinerator is within the range of the target value. However, it was not possible to control the combustion state accurately because the time delay of the combustion was large or changes in the combustion state could not be predicted.

Further, even if the combustion air amount is adjusted by controlling the exhaust gas temperature or the exhaust gas amount to control the combustion state, for example, when the exhaust gas amount is increased by uncertain information, hunting or the like occurs, and the combustion is accurately performed. The state could not be controlled.

In particular, in a refuse incinerator that performs intermittent operation without continuous operation for 24 hours for 8 hours or 16 hours, it is difficult to operate in a non-steady state until it reaches a steady state, and in this non-steady state, bad exhaust gas is discharged to the outside of the system. I had to discharge it.

Therefore, there is also a method of performing the constant weight supply control by grasping the amount of refuse supply as weight, but the stability of the combustion system is not good because the stability due to heat quantity control is ignored.
In short, the most important and most difficult factor to control the combustion state is the amount of refuse supply. However, in the past, the judgment of the quality of waste and the density of waste depended largely on the experience and intuition of operators, and it has been difficult to grasp this and control the amount of waste supply that matches this fluctuation. There is. Therefore, the control of the waste supply amount was abandoned, and as described above, the length of the interval at which the waste extruder intermittently operates and the waste extruder under the condition that the extrusion stroke of the waste extruder is constant. It is adjusted according to the operating speed of. Then, for a given amount of waste supplied to the waste incinerator, let's control the combustion state of the waste by the operation of distributing the waste feed rate in the waste incinerator, the amount of combustion air, the air for combustion, and the air temperature. However, it was difficult to properly control the combustion state according to the quality of the waste and the density of the waste.

Many factors are involved in the combustion state change in a complicated manner, and even if an attempt is made to operate the combustion state based on uncertain information, the reaction of the combustion state caused by the operation For example, the combustion state in the steady state is deteriorated.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to appropriately control the combustion state of refuse in a refuse incinerator from an unsteady state to a steady state. It is to provide a combustion control method for a refuse incinerator that can be performed.

[0016]

The invention according to claim 1 is
In the combustion control method of the waste incinerator, which controls the combustion state of the waste by supplying the waste to the waste incinerator by the dust extruder of the dust collector, the exhaust gas temperature of the exhaust gas generated by the incineration of the waste causes It is characterized by controlling the extrusion stroke.

According to a second aspect of the present invention, in a combustion control method for a waste incinerator, the waste is supplied to the waste incinerator by a dust extruder of a dust supply device to control the combustion state of the waste, and is generated by incineration of the waste. The extrusion stroke of the waste extruder is controlled by the exhaust gas temperature of the exhaust gas and other factors that affect the combustion state of the waste.

According to a third aspect of the present invention, in a combustion control method for a waste incinerator, the waste is supplied to the waste incinerator by a dust extruder of a dust supply device to control the combustion state of the waste. The feature is that the extrusion stroke of the waste extruder is controlled by the amount of exhaust gas of the exhaust gas.

According to a fourth aspect of the present invention, in a combustion control method for a waste incinerator, the waste is supplied to the waste incinerator by a dust extruder of a dust supply device to control the combustion state of the waste, and is generated by incineration of the waste. It is characterized in that the extrusion stroke of the waste extruder is controlled by other factors that affect the exhaust gas amount of the exhaust gas and the combustion state of the waste.

According to a fifth aspect of the present invention, in the method of controlling combustion of a refuse incinerator, the waste is supplied to the refuse incinerator by controlling the combustion state of the refuse by supplying the refuse to the refuse incinerator by the dust extruder of the dust supply device. The feature is that the extrusion stroke of the waste extruder is controlled by the amount of waste input.

According to a sixth aspect of the present invention, in a dust incinerator combustion control method of supplying dust to a dust incinerator and controlling the combustion state of the dust by a dust extruder of a dust supply device, the dust is supplied to the dust incinerator. It is characterized in that the extrusion stroke of the waste extruder is controlled depending on the amount of waste input and other factors that affect the combustion state of the waste.

According to a seventh aspect of the present invention, in a combustion control method for a waste incinerator, the waste is supplied to the waste incinerator by a dust extruder of a dust supply device to control the combustion state of the waste. It is characterized by controlling the extrusion stroke of the extruder.

According to the eighth aspect of the present invention, there is provided a waste incinerator combustion control method for supplying waste to an incinerator to control the combustion state of the waste by means of a dust extruder of a dust supply device. Due to other factors that affect combustion conditions,
It is characterized by controlling the extrusion stroke of the waste extruder.

According to a ninth aspect of the present invention, in a combustion control method for a refuse incinerator, the dust is supplied to the refuse incinerator to control the combustion state of the refuse by the dust extruder of the dust supply device. The extrusion stroke is controlled by the extrusion stroke.

According to a tenth aspect of the present invention, in a combustion control method for a waste incinerator, the dust is supplied to the waste incinerator by a dust extruder of a dust supply device to control the combustion state of the waste, and The extrusion stroke is controlled by the extrusion stroke and other factors that affect the combustion state of the dust.

The invention according to claim 11 is a combustion control method for a refuse incinerator, which controls the combustion state of the refuse by supplying it to the refuse incinerator by a dust extruder of a dust supply device. It is characterized in that the extrusion stroke is controlled by the quality, the exhaust gas temperature and amount of the exhaust gas generated by incineration of the waste, and the previous extrusion stroke of the waste extruder.

According to a twelfth aspect of the present invention, in the method of controlling combustion of a refuse incinerator, the waste is supplied to the refuse incinerator by the dust extruder of the dust supply device to control the combustion state of the refuse, and the amount of refuse to be injected and the amount of dust Extrusion stroke under at least one of the following conditions: quality, exhaust gas temperature and amount of exhaust gas generated by incineration of waste, and previous extrusion stroke of waste extruder as control factors. Is controlled to be longer than the previous extrusion stroke.

According to a thirteenth aspect of the present invention, in the method for controlling combustion of a refuse incinerator, the waste is supplied to the refuse incinerator by a dust extruder of a dust supply apparatus to control the combustion state of the refuse, and the amount of refuse input, the amount of dust, and the like. With the quality, the exhaust gas temperature and amount of exhaust gas generated by incineration of waste, and the previous extrusion stroke of the waste extruder as control factors, the extrusion stroke is adjusted in a state where at least one of the exhaust gas temperature and the exhaust gas amount is appropriate. , Is controlled to be the same as the previous pushing stroke.

According to a fourteenth aspect of the present invention, in the combustion control method for a waste incinerator, the waste is supplied to the waste incinerator by the dust extruder of the dust supply device to control the combustion state of the waste. With the quality, exhaust gas temperature and exhaust gas amount of exhaust gas generated by incineration of waste, and the previous extrusion stroke of the waste extruder as control factors, at least one of exhaust gas temperature and exhaust gas amount deviates from the appropriate state, It is characterized in that the pushing stroke is controlled so as to be changed with respect to the previous pushing stroke.

[0030]

According to the first aspect of the invention, the extrusion stroke of the waste extruder is controlled by the temperature of the exhaust gas generated by incineration of the waste.

According to the second aspect of the present invention, the extrusion stroke of the waste extruder is controlled by the exhaust gas temperature of the exhaust gas generated by the incineration of the waste and other factors that affect the combustion state of the waste.

According to the third aspect of the invention, the extrusion stroke of the waste extruder is controlled by the amount of exhaust gas generated by incineration of the waste. In the invention described in claim 4, the extrusion stroke of the dust extruder is controlled by the exhaust gas amount of the exhaust gas generated by the incineration of the dust and other factors that affect the combustion state of the dust.

In the fifth aspect of the invention, the extrusion stroke of the waste extruder is controlled by the amount of waste that is supplied to the waste incinerator. In the invention described in claim 6, the extrusion stroke of the waste extruder is controlled by the other factors that affect the amount of waste input to the waste incinerator and the combustion state of the waste.

In the invention according to claim 7, the extrusion stroke of the dust extruder is controlled by the dust quality. In the invention according to claim 8, the extrusion stroke of the waste extruder is controlled by other factors that affect the quality of the waste and the combustion state of the waste.

In the ninth aspect of the invention, the extrusion stroke is controlled by the previous extrusion stroke of the dust extruder. In the invention according to claim 10, the extrusion stroke is controlled by the previous extrusion stroke of the dust extruder and other factors that affect the combustion state of the dust.

According to the eleventh aspect of the present invention, the extrusion stroke is controlled by the amount of waste input, the quality of waste, the exhaust gas temperature and amount of exhaust gas generated by incineration of the waste, and the previous extrusion stroke of the waste extruder.

According to the twelfth aspect of the present invention, the temperature of the exhaust gas rises by using the amount of waste input, the quality of the waste, the exhaust gas temperature and amount of the exhaust gas generated by incineration of the waste, and the previous extrusion stroke of the waste extruder as control factors. The extrusion stroke is controlled to be longer than the previous extrusion stroke under at least one of the increase of the exhaust gas amount.

According to the thirteenth aspect of the present invention, the exhaust gas temperature, the exhaust gas, and the exhaust gas temperature and the exhaust gas amount of the exhaust gas generated by incineration of the waste, the previous extrusion stroke of the waste extruder are used as control factors. The extrusion stroke is controlled to be the same as the previous extrusion stroke, with at least one of the quantities being appropriate.

In the fourteenth aspect of the present invention, the exhaust gas temperature, the exhaust gas temperature, the exhaust gas temperature, the exhaust gas temperature and the exhaust gas amount of the exhaust gas generated by the incineration of the waste, the previous extrusion stroke of the waste extruder are used as control factors. The extrusion stroke is controlled so as to be changed with respect to the previous extrusion stroke in a state where at least one of the amounts deviates from the appropriate state.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 indicates a refuse incinerator. The waste incinerator 1 includes a hopper 2 to which waste is supplied by a waste crane (not shown), a hopper chute 3 that guides the waste from the hopper 2, and a waste extruder 4 that transfers the waste from the hopper chute 3. A dust collector having
It is provided with a dry stoker 5 for drying the waste supplied by the dust supply device, a combustion stoker 6 for burning the waste from the dry stoker 5, and a post-combustion stoker 7 for burning the waste from the combustion stoker 6 and burning it. . Waste extruder 4 above
Are provided in two stages, upper and lower, and are provided in the lower part of the hopper chute 3. The dry stoker 5, the combustion stoker 6, and the post-combustion stoker 7 are housed in a furnace body 8, an exhaust port 9 for discharging combustion gas is formed at an upper end of the furnace body 8, and a side wall surface of the furnace body 8 is formed. A cooling water supply port 10, a secondary air forced air blower 11, and an exhaust gas temperature sensor 12 between the cooling water supply port 10 and the secondary forced air blower 11 are provided, and an auxiliary combustion burner 13 is provided at the lower end of the furnace body 8. Is provided. Furnace body 8
The inside of is a combustion chamber 14 above the dry stoker 5, the combustion stoker 6, and the post-combustion stoker 7, and the secondary forced draft blower 1.
It is composed of an upper chamber 15 near 1 and a gas cooling chamber 16 above the upper chamber 15.

Then, one end of the air supply pipe 17 is connected to the dust pit 18, and the other end side is branched midway to connect to the lower part 8A of the drying stoker 5 of the furnace body 8; The second branch pipe 17B connected to the lower portion 8B of the combustion stoker 6 and the third branched pipe 17B connected to the lower portion 8C of the post combustion stoker 7.
It constitutes the branch pipe 17C. An air volume adjusting damper 17D, a primary air pushing blower 19 and a primary air temperature adjusting damper 19A are provided in the middle of the air supply pipe 17 described above. A primary air distribution first damper 20A is provided in the middle of the first branch pipe 17A, a primary air distribution second damper 20B is provided in the middle of the second branch pipe 17B, and a primary air distribution is provided in the middle of the third branch pipe 17C. The distribution third dampers 20C are provided respectively.

A discharge pipe 21 is connected to the discharge port 9 of the furnace body 8, and an air preheater 22, an electric dust collector 23, and an exhaust gas amount detection sensor 24 are sequentially provided in the middle of the discharge pipe 21. There is. Primary air temperature adjustment damper 19A of the air supply pipe 17
Air pipes 25, 25 for heat exchange passing through the air preheater 22 are connected to both side portions of.

A dust input amount sensor 26 is mounted on the hopper chute 3, and a dust quality setting dial 27 (shown in FIG. 2) is provided on a control panel (not shown).
The quality of waste is decided by the operator. The waste quality setting dial can be adjusted in the range of 0% to 100%, and the waste quality setting dial 0% = bad waste (hard to burn), waste quality setting dial 100% = good waste (easy to burn), and waste If it is difficult to judge the quality, temporarily enter 50%, for example.

In FIG. 2, 28 is a fuzzy controller, which has a fuzzy inference engine 29 and a knowledge K. The fuzzy inference engine 29 inputs the knowledge K and facts (input variables) described later. The fact is compared with the knowledge K, and if it matches with the content of the knowledge K, the conclusion is that a control output according to the content of the knowledge K is output. The input variables to the fuzzy inference engine 29 are the amount of waste input, the exhaust gas temperature, the exhaust gas amount,
These are the waste quality and the previous extrusion stroke. The control output is the push stroke.

Knowledge K includes a group of non-steady state control rules R1, R2, R3, ... RN including a plurality of rules and a group of steady state control rules T1, T2, T3 ...
・, TN is included. Specifically, the unsteady state control rule groups R1, R2, R3, ..., RN are input variable names and their inputs under the judgment that the combustion state of the refuse incinerator 1 is an unsteady state. It consists of an antecedent part proposition that corresponds fuzzy variable names to quantities and an antecedent part proposition that corresponds fuzzy variable names to output variable names called extrusion strokes. The antecedent part proposition consists of an input variable name including at least one element among the five input variable names of the waste input amount, the exhaust gas temperature, the exhaust gas amount, the waste quality, and the previous extrusion stroke.

For example, the rule group R1 defines "if the amount of dust input is a little larger, make the extrusion stroke a little shorter than the previous extrusion stroke." There are as many rules as there are.

The rule group R2 stipulates that "if the exhaust gas amount is small, increase the extrusion stroke a little as the exhaust gas temperature rises", and there are as many rules as the number of fuzzy variables of the exhaust gas temperature. is there.

The rule group R3 defines "If the extrusion stroke should be determined in accordance with the quality of the dust," there are rules corresponding to the number of fuzzy variables indicating the quality of the dust. Steady-state control rule group T1, T2, T3 ..., TN
As one of the above, there is a judgment that it is a steady state in which the extrusion stroke (control output) does not change when the exhaust gas temperature and the exhaust gas amount indicating the combustion state are in a predetermined state. For example,
Rule group T1 stipulates that "if the exhaust gas temperature is high and the exhaust gas amount is large, make the previous extrusion stroke and the extrusion stroke the same." There are as many rules as there are.

A general controller 30 receives the inference result (extrusion stroke) of the controller 28 as a voltage signal, sends this voltage signal to a hydraulic cylinder (not shown) which gives the dust extruder 4 a predetermined extrusion stroke, and For example, conventional control such as PID control is performed on the air amount and temperature.

3 to 8 show the labels of the input / output variable names in the control rules of the knowledge K, respectively. That is,
Figure 3 is a label for the amount of waste input, Figure 4 is a label for the amount of exhaust gas,
5 shows a label of dust quality, FIG. 6 shows a label of exhaust gas temperature, FIG. 7 shows a label of the previous extrusion stroke, and FIG. 8 shows a label of the extrusion stroke. In each figure, the entire range of input and output variables is assigned with multiple labels, and multiple fuzzy variables represented by membership functions are shown.
The horizontal axis shows the measured value and the vertical axis shows the grade. As a label (quantity to be expressed), a reference label (ZR) assigned near the center of the entire range of input / output values of input / output variables, one or more positive labels evaluated to be above the reference label, and a reference label Is labeled with one or more negative labels that are evaluated as below. That is, the following four types are defined as the amount of waste to be input.

NM Small (small) NS Small (small) ZR Medium (suitable) PS Large (large) In addition, for input variables and output variables other than the amount of waste input, the following seven types are used. It has established.

NL very (very) small (less) NM small (less) NS slightly smaller (less) ZR medium (suitable) PS slightly larger (more) PM larger (more) PL very (very) larger (Many) In addition, in the pushing stroke of FIG. 8, the stroke range L1 is assigned by seven labels. In contrast, in FIG. Since the subject part membership function is determined, the range L of the horizontal axis thereof is made narrower than the range L1 of the horizontal axis of the extrusion stroke.

Then, a refuse crane (not shown) starts to put dust in the dust pit 18 and the operation of the controller 28 is started. The waste of the hopper chute 3 is transferred to the drying stoker 5 by the waste extruder 4.
The amount of dust supplied is controlled under a constant interval condition by the extrusion stroke of the dust extruder 4, and as a result,
The combustion state of dust is fuzzy controlled by the fuzzy controller 28 as follows. And the garbage is agitated
While being unraveled, it is transferred forward, transported from the dry stoker 5 to the combustion stoker 6, and further burned stoker 6
Then, it is burned while being stirred and unraveled, transferred to the front and conveyed to the post-combustion stoker 7.

The operation of the fuzzy inference engine 29 will be described in detail below. 1 and 2, the waste quality is set as a percentage by the waste quality setting dial 27 as an input variable, the exhaust gas temperature is measured by the exhaust gas temperature sensor 12, and the exhaust gas amount is measured by the exhaust gas amount detection sensor 24. The amount of dust thrown into the hopper chute 3 is measured by the throw amount sensor 26, and the measured values are input to the fuzzy inference engine 29 via a signal converter (not shown). Further, the previous pushing stroke output from the fuzzy inference engine 29 is fed back as an input variable and input to the fuzzy inference engine 29 via a signal converter (not shown).

In the fuzzy inference engine 29, fuzzy inference is performed and the pushing stroke is output under the condition that the interval is constant. First, in the fuzzy controller 28, initial values are given to the measured values of the input / output variables. Then, the combustion state enters an unsteady state, and this initial value is input to the fuzzy inference engine 29, and the amount of dust according to the extrusion stroke is supplied by the extrusion stroke of the fuzzy inference engine 29 as follows. Transferred to the drying stoker 5 via the hydraulic cylinder of the device, the exhaust gas temperature and the exhaust gas amount indicating the combustion state of the controlled system generated as a result of the combustion of dust are changed, and from the unsteady state to the steady state corresponding to the extrusion stroke. Move to.

Here, as the above-mentioned initial values, dust quality (set value) = 30%, dust input amount (initial input) = 7.5 t /
The exhaust gas amount is 10000 cubic m / h, the exhaust gas temperature (measured value) is 300 ° C., and the previous extrusion stroke is 60.
The case of 0 mm will be described as an example. In the unsteady state, the fuzzy inference engine 29 causes the waste input amount, the waste quality, the exhaust gas temperature and the exhaust gas amount of the exhaust gas generated by the incineration of the waste as input variables, and the previous extrusion stroke of the waste extruder 4 to be in the unsteady state. Control rule group R1, R2
Fuzzy inference is performed as follows in the light of R3 ... RN.

The dust quality is set as follows. In the non-steady state that the waste is not burning, when the waste is put into the waste incinerator and incinerated, the quality of the waste can be judged only by the judgment criteria of the condition observed from the outside. For example, if the result of operation in which the quality of waste is set to 50% is thick and difficult to burn, it is determined that the quality of waste is poor, and the operation is made 40%. On the contrary, if the dust is thin and burned out, even an inexperienced operator can drive for a short day by simply repeating the extremely simple judgment such as changing the dust quality dial to 60%. Appropriate settings for the waste quality dial are determined.

First, the label and grade of the initial value and measured value of each input variable are obtained. As shown in FIG. 5, when the quality of the waste as the input variable is 30% as described above, the grade of the fuzzy variable named label NM is 0.2 and the grade of the fuzzy variable named label NS. Becomes 0.8.

The waste input amount as an input variable is given as (initial input) = 7.5 t / h as described above,
As shown in FIG. 3, the grade of the fuzzy variable called the label PS is 1.0.

As shown in FIG. 4, the fuzzy variable grade of label NM is 0.35 and the fuzzy variable grade of label NS is 0.65 with respect to the exhaust gas amount = 10000 cubic m / h as the input variable. Becomes

With respect to the exhaust gas temperature = 300 ° C. as an input variable, as shown in FIG. 6, the grade of the fuzzy variable labeled NL is 0.5 and the grade of the fuzzy variable labeled NM is 0.5.

For the previous extrusion stroke = 600 mm as an input variable, as shown in FIG. 7, the label NL
The grade of the fuzzy variable is 1.0. next,
A label indicating the membership function of each of the above input variables,
Non-steady state control rule group R1, R2, R for grade
.., RN, the membership function of each extrusion stroke is obtained for each unsteady state control rule group.

"If the dust input amount is a little larger, the extrusion stroke should be made slightly shorter than the previous extrusion stroke." As the 1 of the unsteady state control rule group R1, "If the dust input amount = PS And, if the previous extrusion stroke = NL, there should be a rule of "extrusion stroke = NL". Substituting the waste input amount PS = 1 and the extrusion stroke NL = 1 results in grade 1 as shown in Fig. 9. The label NL of the cut extrusion stroke is obtained.

Also, "if the amount of exhaust gas is small,
Increase the extrusion stroke a little as the exhaust gas temperature rises. As one of the non-steady-state control rule groups R2 defined as "," if the exhaust gas amount = NM and the exhaust gas temperature = NL
Then, push stroke = NL "rule R2
There is (1), exhaust gas amount NM = 0.35, exhaust gas temperature N
When L = 0 and 5 are substituted, the smaller value of the grade becomes the conforming value, and as shown in FIG. 10, the label NL of the extrusion stroke cut at the grade 0.35 is obtained. "if,
If exhaust gas amount = NM and exhaust gas temperature = NM, then stroke = NS ", there is a rule R2 (2). If exhaust gas amount NM = 0.35, exhaust gas temperature NM = 0, 5 is substituted, The smaller value becomes the conforming value, and as shown in FIG. 10, an extrusion stroke label NM cut with grade 0.35 is obtained.

Then, as one of the non-steady-state control rule groups R3 defined as "determine the extrusion stroke according to the dust quality,""if the dust quality = NM, change the extrusion stroke = NM. Rule R3 (1)
By substituting the trash quality NM = 0, 2 as shown in FIG. 11, the label NM of the extrusion stroke cut with grade 0.2 is obtained. There is a rule R3 (2) "If waste quality = NS, push out stroke = NS", and if waste quality NM = 0, 8 is substituted, it will be cut to grade 0.8 as shown in Fig. 11. The label NS of the extrusion stroke is obtained.

Next, as shown in FIG. 12, the center of gravity of the area of the membership function of the output variable shown in FIGS. 9, 10, and 111 obtained in accordance with each control rule is synthesized, and the synthesized center of gravity is synthesized. The position is the output value (720 mm) of the extrusion stroke indicated by the arrow (defification).

By the above fuzzy control, the waste is sent to the waste incinerator 1 little by little while observing the state of combustion of the waste, and the heat of the auxiliary burner 13 burns the waste while drying it.

In the fuzzy inference engine 29, when the fuzzy variable indicating that the exhaust gas temperature is high as the input variable to be fed back and the fuzzy variable indicating that the exhaust gas amount is large are displayed, "If the exhaust gas temperature is high, And if the amount of exhaust gas is large, make the extrusion stroke the same as the previous one. "
Fuzzy inference is performed based on one rule of the steady state control rule group T1 defined as follows, and the extrusion stroke is output so as not to change. In this way, the extrusion stroke does not change, the exhaust gas temperature is high, and the exhaust gas temperature and the exhaust gas amount are converged to a predetermined convergence value, which is a steady state in which the exhaust gas temperature is high and the exhaust gas amount is large. In this state, the exhaust gas temperature, the exhaust gas amount, and the extrusion stroke are in a balanced state, and the exhaust gas temperature is high and the exhaust gas amount is large. When at least one of the exhaust gas temperature and the exhaust gas amount deviates from the appropriate state, the extrusion stroke is controlled to be changed (lengthened or shortened) with respect to the previous extrusion stroke.

The steady state convergence value of the exhaust gas temperature is
The temperature is in the vicinity of the label PM (about 800 ° C. to 900 ° C.), and the steady state convergence value of the exhaust gas amount is the amount in the vicinity of the label PM (30000 cubic m / h). In, the membership function of the positive label and the membership function in the vicinity thereof are applied as fuzzy variables. Therefore, when the exhaust gas temperature and the exhaust gas amount indicating the combustion state change, fuzzy inference is performed by these labels, and the extrusion stroke is output from the fuzzy inference engine 29 according to the change in the combustion state. Even if the (exhaust gas temperature, exhaust gas amount) deviates from the steady state converged value, the sensitivity of the fuzzy inference engine 29 does not deteriorate. On the other hand, in the non-steady state, labels other than the labels assigned to the steady state are assigned to the exhaust gas temperature and the exhaust gas amount as input variables, and a predetermined number of labels are secured within the range of the non-steady state. . Therefore, an appropriate number of fuzzy variables represented by those labels is secured for the input value, the control rule is applied in an appropriate number, and the extrusion stroke is appropriately controlled.

Then, when the input of the waste is completed, the fuzzy inference by the controller 28 is completed, and the waste extruder 4
The waste extruder is operated without changing the extrusion stroke, and thereafter the operation is continued within each set time by selecting either the open flame or the burnout.

According to the above-mentioned structure, the following effects can be obtained. Firstly, since the extrusion stroke of the waste extruder 4 is controlled by the exhaust gas temperature of the exhaust gas generated by the incineration of the waste, the waste supply amount of the maximum contribution rate to the combustion state of the waste is directly controlled. , It is possible to more appropriately control the combustion state of waste.

Secondly, since the extrusion stroke of the waste extruder 4 is controlled by the exhaust gas amount of the exhaust gas generated by the incineration of the waste, the waste supply amount of the maximum contribution rate to the combustion state of the waste is directly controlled. It is possible to more appropriately control the combustion state of waste by operating the above.

Thirdly, since the extrusion stroke of the waste extruder 4 is controlled by the amount of waste supplied to the waste incinerator 1, the maximum contribution to the combustion state of the waste is made according to the amount of waste input. It is possible to directly control the rate of the refuse supply and to more appropriately control the combustion state of the refuse. Therefore,
The stability of combustion can be increased.

Fourthly, since the extrusion stroke of the waste extruder 4 is controlled by the quality of the waste, depending on the quality of the waste,
It is possible to directly control the amount of refuse supplied with the maximum contribution rate with respect to the state of combustion of the waste to more appropriately control the state of combustion of the waste.

For example, the dust quality dial is set in the range of 0 to 100%, the dust quality is appropriately determined, and if the dust quality is bad, the direction is brought closer to 0%, and if it is good, the direction is brought closer to 100%. In addition, even a person other than a skilled engineer who has no knowledge of combustion operation can make the same level of operation determination as a skilled engineer, such as what kind of waste quality will be produced and what result will be produced. it can. Even an inexperienced driving operator can make a proper judgment of the waste quality dial during a short-day operation, and as a result, the combustion state of the waste can be stabilized.

Fifth, since the extrusion stroke is controlled by the previous extrusion stroke of the dust extruder 4, the extrusion stroke is determined on the basis of the previous extrusion stroke, and therefore does not move largely from the previous extrusion stroke. For example, it is possible to maintain a good combustion state.

Sixth, since the extrusion stroke is controlled by the previous extrusion stroke together with the state signal of the factor that influences the combustion state of the refuse incinerator 1, it follows the previous extrusion stroke and greatly increases. It can be appropriately changed without changing the extrusion stroke. In particular, when it is difficult to determine the input variable that contributes to the combustion state, or when the input variable is an abnormal value, the extrusion stroke does not move significantly.Therefore, determine whether the combustion state is abnormal or not. It can be judged in the process of changing the stroke. More specifically, since the previous extrusion stroke is fed back to the fuzzy inference engine 29, the suitability of the antecedent part due to the previous extrusion stroke is the membership function of the consequent part during the defuzzification of the fuzzy inference. Construct an element for determining a subset of.

Therefore, the composite output value of the consequent part membership function is pulled to the subset of the consequent part membership function corresponding to the previous extrusion stroke. Therefore, when the push stroke does not move largely from the previous push stroke and the state signal of the factor affecting the state of the controlled system is input to the fuzzy inference engine 29, the push stroke of the fuzzy inference engine 29 is changed to the previous push stroke. On the other hand, it can be appropriately changed without following the change.

Seventh, since the extrusion stroke is controlled by the amount of waste input, the quality of waste, the exhaust gas temperature and amount of exhaust gas generated by incineration of the waste, and the previous extrusion stroke of the waste extruder 4, In addition to the above-mentioned fifth effect from the effect of No. 1, in addition to the fifth effect, it is impossible to judge the amount of waste supplied according to the quality of waste on behalf of an experienced engineer, and control of the amount of waste supply is possible. can do.

Eighth, since the extruding stroke of the waste extruder 4 is controlled so as to be slightly longer than the previous extruding stroke as the exhaust gas temperature rises and the exhaust gas amount increases, the above seventh effect is obtained. In addition, it is possible to control the combustion so as to improve the combustion even in a non-steady state combustion state of the waste, and it is possible to secure a supply amount of the waste according to the waste quality even if the waste quality is unknown.

Ninth, since the extruding stroke of the dust extruder 4 is controlled to be the same as the previous extruding stroke in a state where the exhaust gas temperature and the exhaust gas temperature are appropriate, the seventh effect can be obtained. In addition, it is possible to judge whether the exhaust gas temperature and the amount of exhaust gas generated as a result of the combustion state are appropriate as a result. In addition, even if the quality of the waste is unknown, the amount of the waste supplied according to the quality of the waste can be secured. be able to.

More specifically, in order to control the amount of waste supplied by general feedback control, the target value of the amount of waste supply is required, and the target value was set, but even if there is no target value, In the fuzzy inference engine 29, when the state of the controlled system (exhaust gas temperature, exhaust gas amount) falls within a predetermined range, the push stroke outputs the same value as the previous push stroke in light of the steady state control rule group.
That is, in this state, it becomes a balanced steady state,
It is judged from the result that the state of the controlled system is within the predetermined range is appropriate.

Further, since the previous pushing stroke is fed back as a fact to the fuzzy inference engine 29, the pushing stroke changes slowly. This gentle pushing stroke and the state of the controlled system described above are fed back to the fuzzy inference engine 29, so that the state of the controlled system changes while it is judged whether or not it is appropriate as a result. Therefore, it is possible to make a transition from the unsteady state to the steady state and ensure the transition.

Therefore, even if there is no target state for setting the state of the controlled system, in the fuzzy reasoning engine 29, at least when the fact is matched with the steady state control rule group, the extrusion is performed. It is determined from the result that the stroke is output so as not to change, and the state of the controlled system is within a predetermined range, and that state is maintained.

That is, even if there is no target state of the controlled system, the state of the controlled system within a predetermined range is a pseudo target state for determining this with respect to the extrusion stroke. The condition of setting the target state in the feedback control can be eliminated, the device for determining the target state is not required, and the system can be simplified.

As described above, as the factor for controlling the combustion state, the amount of refuse supply, which is the most important and the most difficult to control, can be manipulated according to the quality and density of the waste, The extrusion stroke of the waste extruder 4 that controls the supply amount (thickness, etc.) is gradually increased from the previous extrusion stroke as the exhaust gas temperature rises and the exhaust gas amount increases. By adopting a control method that allows the extrusion stroke to remain the same as the previous extrusion stroke when it enters a section that is in a well-balanced state, it is possible to supply according to the dust quality even if the dust quality is unknown. .

As a result, the conventional combustion control was not possible without changing the operation of the refuse feed rate operation, air amount operation, air temperature operation, and combustion air distribution operation in the refuse incinerator 1. , The waste supply amount according to the waste quality is judged on behalf of a skilled engineer, and the waste supply amount is controlled by operating the extrusion stroke of the waste extruder 4.
This has the effect of starting combustion from an unsteady state and maintaining a normal combustion state (steady state).

In the present embodiment, the amount of dust input,
The extrusion stroke of the waste extruder 4 is controlled by inputting the waste quality, the exhaust gas temperature, the exhaust gas amount, and the previous extrusion stroke of the waste extruder 4 to the fuzzy inference engine 29 as the control means. The fuzzy reasoning engine 29 is not limited to the fuzzy reasoning engine 29, but may be replaced by the following control device. This controller is
Waste input amount, waste quality, exhaust gas temperature, exhaust gas amount, previous extrusion stroke of the waste extruder are input respectively, and those values are recorded in a multi-dimensional matrix for the combustion state from unsteady state to steady state. A storage device that stores an optimum combination table and an optimum extrusion stroke corresponding to this combination table is provided, and the above-mentioned inputs are collated with the combination table to optimally control the extrusion stroke of the dust extruder 4. .

Further, in this embodiment,
By inputting the waste quality, the exhaust gas temperature, the exhaust gas amount, and the previous extrusion stroke of the waste extruder 4 into the fuzzy inference engine 29 as input variables, the waste extruder 4 is input.
The pushing stroke is controlled, but the pushing stroke can be controlled by inputting at least one or more input variables from the plurality of input variables to the fuzzy inference engine 29.

Further, in this embodiment, the extrusion stroke is controlled so as to be longer than the previous extrusion stroke as the exhaust gas temperature rises. However, the present invention is not limited to such a case, and the exhaust gas amount Under the conditions of increasing the exhaust gas temperature or increasing the exhaust gas temperature and the exhaust gas amount, the extrusion stroke can be controlled to be longer than the previous extrusion stroke.

[0091]

As described above, according to the present invention,
It has the following effects. According to the first and second aspects of the present invention, since the extrusion stroke of the waste extruder is controlled by the exhaust gas temperature of the exhaust gas generated by the incineration of the waste, the waste supply with the maximum contribution rate to the combustion state of the waste is supplied. The quantity can be directly manipulated to better control the combustion state of the refuse.

According to the third and fourth aspects of the invention, since the extrusion stroke of the waste extruder is controlled by the amount of exhaust gas generated by incineration of the waste, the maximum contribution rate to the combustion state of the waste It is possible to more directly control the combustion state of the waste by directly controlling the amount of waste supplied.

According to the fifth and sixth aspects of the present invention, since the extrusion stroke of the waste extruder is controlled by the amount of waste that is supplied to the waste incinerator, the combustion of the waste depends on the amount of the waste that is input. It is possible to more directly control the combustion state of the waste by directly controlling the waste supply amount of the maximum contribution rate to the state. Therefore, for example, in steady-state combustion, combustion stability can be ensured.

According to the seventh and eighth aspects of the present invention, since the extrusion stroke of the dust extruder is controlled by the dust quality, the dust having the maximum contribution rate to the combustion state of the dust depends on the dust quality. It is possible to directly control the supply amount and more appropriately control the combustion state of the waste, and to ensure the stability of combustion in, for example, steady-state combustion.

According to the ninth aspect of the present invention, since the extrusion stroke of the dust extruder is controlled by the previous extrusion stroke of the dust extruder, the extrusion stroke is
It is determined based on the previous push stroke, and does not move much from the previous push stroke. Therefore, for example, the combustion state can be favorably maintained.

According to the tenth aspect of the present invention, the extrusion stroke is controlled by the previous extrusion stroke together with the factors affecting the combustion state of the refuse incinerator. Therefore, it is possible to appropriately change the extrusion stroke without changing the extrusion stroke. In particular, when it is difficult to determine the input variable that contributes to the combustion state, or when the input variable is an abnormal value, the extrusion stroke does not move significantly, so
Whether the combustion state is abnormal or not can be determined in the process of changing the extrusion stroke.

According to the eleventh aspect of the invention, the extrusion stroke is controlled by the amount of waste input, the quality of waste, the exhaust gas temperature and amount of exhaust gas generated by incineration of waste, and the previous extrusion stroke of the waste extruder. Therefore, in addition to the effect from the invention of claim 1 to the invention of claim 10, it is necessary for a skilled engineer to judge the amount of waste supply according to the quality of waste, which was impossible with the conventional combustion control. Instead, it can be comprehensively controlled to control the amount of waste supplied.

According to the invention of claim 12, claim 1
In addition to the configuration of the invention described in 1, the extrusion stroke is controlled so that the extrusion stroke of the waste extruder is set to be longer than the previous extrusion stroke under at least one of the increase in exhaust gas temperature and the increase in exhaust gas amount. Therefore, in addition to the effect of the invention according to claim 11, it is possible to control so that combustion is improved even in a non-steady-state combustion state of waste, and even if the waste quality is unknown, it depends on the waste quality. It is possible to secure the amount of garbage supplied.

According to the invention of claim 13, claim 1
In addition to the configuration of the invention described in 1, in the state where at least one of the exhaust gas temperature and the exhaust gas temperature is appropriate, the extrusion stroke of the extruder is controlled to be the same as the previous extrusion stroke. In addition to the effect of the invention described in Item 11, it is possible to judge whether the exhaust gas temperature and the exhaust gas amount resulting from the combustion state are appropriate as a result. It is possible to secure the amount of garbage supplied.

According to the invention of claim 14, claim 1
The same effect as the invention described in 3 is obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refuse incinerator according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a fuzzy control method for the refuse incinerator.

FIG. 3 is a diagram showing labels of a waste supply amount in fuzzy control.

FIG. 4 is a diagram showing labels of exhaust gas amounts in fuzzy control.

FIG. 5 is a diagram showing labels of dust quality in fuzzy control.

FIG. 6 is a diagram showing labels of exhaust gas temperatures in fuzzy control.

FIG. 7 is a diagram showing labels of previous extrusion strokes in fuzzy control.

FIG. 8 is a diagram showing labels of extrusion strokes in fuzzy control.

FIG. 9 is an explanatory diagram showing a membership function of output variables.

FIG. 10 is an explanatory diagram showing a membership function of output variables.

FIG. 11 is an explanatory diagram showing a membership function of output variables.

FIG. 12 is an explanatory diagram of defuzzification of fuzzy inference.

[Explanation of symbols]

4 garbage extruder 12 Exhaust gas temperature sensor 24 Exhaust gas amount detection sensor 26 Waste input sensor 27 Garbage quality setting dial 29 Fuzzy inference engine K knowledge

Claims (14)

[Claims] 1. A combustion control method for a waste incinerator, which controls the combustion state of the waste by supplying the waste to a waste incinerator by a dust extruder of a dust supply device, according to the exhaust gas temperature of exhaust gas generated by incineration of the waste. , A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of the refuse extruder. 2. A method for controlling combustion in a refuse incinerator, which controls the combustion state of the refuse by supplying the waste to a refuse incinerator by means of a dust extruder of a dust supply device, and the exhaust gas temperature of exhaust gas generated by incineration of the refuse and A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of a refuse extruder according to other factors that affect the combustion state of the refuse. 3. A method for controlling combustion in a refuse incinerator, which controls the combustion state of the refuse by supplying the waste to a refuse incinerator by a dust extruder of a dust supply device, according to the amount of exhaust gas of exhaust gas generated by incineration of the refuse. , A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of the refuse extruder. 4. A combustion control method for a refuse incinerator, which controls the combustion state of the refuse by supplying the refuse to a refuse incinerator by a dust extruder of a dust supply device, and the amount of exhaust gas of exhaust gas generated by incineration of the refuse and A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of a refuse extruder according to other factors that affect the combustion state of the refuse. 5. In a combustion control method for a refuse incinerator, which controls the combustion state of the refuse by supplying the refuse to a refuse incinerator by a dust extruder of a dust collector, depending on the amount of refuse input to the refuse incinerator. , A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of the refuse extruder. 6. In a combustion control method for a refuse incinerator, which controls the combustion state of the refuse by supplying the refuse to a refuse incinerator by a dust extruder of a dust supply device, and the amount of refuse input to the refuse incinerator and A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of a refuse extruder according to other factors that affect the combustion state of the refuse. 7. In a combustion control method for a refuse incinerator, which controls the combustion state of the refuse by supplying the waste to the refuse incinerator by the dust extruder of the dust supply device, the extrusion stroke of the refuse extruder depends on the quality of the refuse. A combustion control method for a refuse incinerator, which is characterized by controlling. 8. A combustion control method for a refuse incinerator, which controls the combustion state of the refuse by supplying the waste to the refuse incinerator by a dust extruder of the dust supply device, which affects the quality of the refuse and the combustion state of the refuse. A combustion control method for a refuse incinerator, comprising controlling the extrusion stroke of the refuse extruder according to other factors. 9. A method for controlling combustion in a refuse incinerator, wherein waste is supplied to a refuse incinerator by a dust extruder of a dust supply device to control the combustion state of the waste, and extrusion is performed by the previous extrusion stroke of the waste extruder. A combustion control method for a refuse incinerator, characterized by controlling stroke. 10. A method of controlling combustion in a refuse incinerator, which comprises controlling the combustion state of the refuse by supplying the refuse to a refuse incinerator by means of the dust extruder of the dust supply device, and A combustion control method for a refuse incinerator, comprising controlling an extrusion stroke according to other factors that affect a combustion state. 11. A method for controlling combustion in a refuse incinerator, which comprises controlling the combustion state of the refuse by supplying the waste to a refuse incinerator by means of a dust extruder of a dust supply device, and A combustion control method for a refuse combustion furnace, characterized in that the extrusion stroke is controlled by the exhaust gas temperature and exhaust gas amount of the generated exhaust gas, and the previous extrusion stroke of the waste extruder. 12. A method for controlling combustion in a refuse incinerator, which comprises controlling the combustion state of the waste by supplying the waste to a refuse incinerator by means of a dust extruder of a dust supply device. Using the exhaust gas temperature and the exhaust gas amount of the generated exhaust gas and the previous extrusion stroke of the waste extruder as control factors, the extrusion stroke is changed to the previous extrusion stroke under at least one of the increase of the exhaust gas temperature and the increase of the exhaust gas amount. A combustion control method for a refuse combustion furnace, which is characterized in that the combustion is controlled to be longer. 13. A method of controlling combustion of a refuse incinerator, which comprises controlling the combustion state of the refuse by supplying the refuse to a refuse incinerator by means of a dust extruder of a dust supply device, and by injecting the refuse, quality of the refuse, and incineration of the refuse. With the exhaust gas temperature and the exhaust gas amount of the generated exhaust gas and the previous extrusion stroke of the waste extruder as control factors, the extrusion stroke is set to the previous extrusion stroke with at least one of the exhaust gas temperature and the exhaust gas amount being appropriate. A combustion control method for a refuse combustion furnace, which is characterized in that the same control is performed. 14. A method for controlling combustion in a refuse incinerator, which comprises controlling the combustion state of the refuse by supplying the waste to a refuse incinerator by means of a dust extruder of a dust supply device, and With the exhaust gas temperature and exhaust gas amount of the generated exhaust gas and the previous extrusion stroke of the waste extruder as control factors, the extrusion stroke is adjusted to the previous value with at least one of the exhaust gas temperature and the exhaust gas amount deviating from the appropriate state. A combustion control method for a refuse combustion furnace, characterized in that control is performed so as to change with respect to an extrusion stroke.