JPH07324720A - Facility for melting dust combustion ash - Google Patents

Abstract

PURPOSE:To provide a facility for melting dust combustion ash in which it has a simple system configuration, it has a superior durability and environmental adaption, its maintenance can be easily performed and its consumption energy is also less in its volume. CONSTITUTION:In a facility for melting dust combustion ash comprised of a dust incinerator 2 and an ash melting furnace 19 for use in melting dust combustion ash discharged out of the incinerator, a high temperature cyclone 50 capable of enduring against 700 deg.C to 950 deg.C is installed at an outlet port of the dust incinerator, an ash discharging port of the high temperature cyclone and an ash supplying port of an ash melting furnace are directly connected by pipe passages 51 and 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for melting incinerated ash such as municipal solid waste, and more particularly to a means for simplifying the facility structure and saving energy.

[0002]

2. Description of the Related Art Conventionally, incinerated ash from municipal waste, etc. was used for landfilling, but recently it has become difficult to secure a landfill site due to an increase in the amount of treated waste. Volume reduction processing by solidification is required.

FIG. 6 shows an example of a conventionally known refuse incineration ash melting facility. In this figure, 1 is a waste input chute, 2 is a waste incinerator, 13 is a blower for supplying combustion air to the waste incinerator 2, and the waste introduced from the input chute 1 is supplied from the blower 13. The combustion air is burned in the refuse incinerator 2. After being preheated by the air preheater 4, the combustion air is divided into primary air that has passed through the valve 14 and secondary air that has passed through the valve 15, and is supplied into the refuse incinerator 2. Exhaust gas from the refuse incinerator 2 is attracted by the induced air blower 9, and the gas cooler 3,
Smoke is exhausted from the chimney 12 via the air preheater 4, the gas cooler 5, and the bag filter 6.

The gas cooler 3 is provided at the exit of the refuse incinerator 2
A device for cooling a high temperature combustion gas which reaches as high as 00 to 950 ° C. to 300 to 500 ° C. which does not cause heat damage to the air preheater 4, and is usually a combustion gas by injecting water into a flue. The method of cooling (water injection method) is adopted. On the other hand, the gas cooler 5 is about 300 ° C.
This is a device for cooling the outlet gas of the air preheater 4 up to about 200 ° C. which is an appropriate gas temperature of the bag filter 6. Normally, a water injection type device is also used for this device.

Reference numeral 31 is a slaked lime hopper which stores slaked lime (Ca (OH) ₂ ) in the form of powder or particles, and 32
Is a constant quantity feeder for supplying a fixed amount of slaked lime stored in the slaked lime hopper 31 into the flue 34. Quantitative feeder 10
The slaked lime supplied from the flue 3 together with the transport air 33.
The gaseous hydrogen chloride (HCl), which was blown into 4 and was generated by the chlorine content contained in the waste, and contained in the combustion gas of the waste incinerator 2 at a concentration of several hundred ppm, was solidified by the following reaction. Of calcium chloride (CaCl ₂ ). This is called desalination treatment. 2HCl + Ca (OH) ₂ → CaCl ₂ + 2H ₂ O Solid CaCl ₂ is collected by the bag filter 6 together with the refuse incineration ash. The collected ash containing CaCl ₂ is transferred to the ash melting furnace 19 via the relay hopper 17, the valve 16 and the ash transfer pipe 18, and is melted by the high temperature flame of the heavy oil burner 20. The molten ash flows down the furnace wall of the ash melting furnace 19 and the slag tap 21 and falls into the slag hopper 22 to be solidified. To the heavy oil burner 20, the combustion air supplied from the blower 30 and preheated by the air preheater 26 is introduced.

[0006] The exhaust gas from the ash melting furnace 19 is an induced air blower 28.
And is exhausted from the chimney 29 via the gas cooler 23, the air preheater 26, the gas cooler 35, and the bag filter 39. In the ash melting furnace 19, 1400 to 1600
Exhaust gas with a temperature of up to ℃ is generated. The high-temperature exhaust gas is cooled to 300 to 500 ° C. by the gas cooler 23 and introduced into the air preheater 26. After passing through the air preheater 26, the high temperature exhaust gas is further cooled to about 200 ° C. by the gas cooler 35, and the bag filter 39. Will be introduced to.

In the ash melting furnace 19, CaCl _{2 in} the ash reacts again with the moisture in the atmosphere due to the high temperature, and the original HCl gas is released into the exhaust gas. Therefore, in the equipment of FIG. 6, it is necessary to perform desalination treatment on the exhaust gas from the ash melting furnace 19, and as shown in the figure, the slaked lime stored in the slaked lime hopper 31 is fed to the flue of the inlet of the bag filter 39. The HCl in the exhaust gas is blown into 27 and turned into CaCl ₂ again, and is collected by the bag filter 39.

The ash collected by the bag filter 39 contains C
Since aCl ₂ , mercury, lead, etc. are contained in high concentration,
It must be chemically stable to prevent toxic substances from eluting. Therefore, the ash collected by the bag filter 39 passes through the relay hopper 40 and the valve 41, and the ash stabilizer 3
6 is stabilized by the action of the solidified drug supplied from the drug supply pipe 37, and then discharged from the discharge pipe 38 to the outside.

[0009]

However, the above-mentioned conventional equipment for melting refuse incinerated ash has various points to be improved as described below.

Since a high-concentration HCl gas is generated in the ash melting furnace 19, the refractory material forming the ash melting furnace 19, the flue from the ash melting furnace 19 to the bag filter 39, and the middle of the flue. Corrosion and corrosion of the provided gas coolers 23 and 35 and the air preheater 26 are remarkable, and frequent inspection work, repair work and equipment replacement work are required.

FIG. 7 shows the calculated relations between the Cl concentration in the combustible waste, the CaCl ₂ concentration in the bag filter ash, and the unreacted Ca (OH) ₂ concentration. As is clear from this figure, in the ash collected by the bag filter 6, that is, in the ash supplied to the ash melting furnace 19, normally 1
The Cl to% contained at a concentration, because CaCl ₂ is contained several% becomes the original HCl gas CaCl ₂ in this ash reacts with moisture again in the atmosphere by the high temperature, ash melting furnace It is released into the exhaust gas of 19.

For example, when 3.5% by weight of CaCl ₂ is contained in the ash to be melted, 1.22% by volume of HCl is contained in the exhaust gas of the ash melting furnace 19,
Not only is it harmful to the human body, but it also requires frequent inspections, repairs, and equipment replacements in order to significantly corrode the refractory materials and flues that make up the ash melting furnace 19. The HCl concentration in the combustion gas of the refuse incinerator 2 is usually about several hundred ppm, whereas the HCl concentration in the exhaust gas of the ash melting furnace 19 is 1% by volume or more. It becomes a big problem.

Since Cl in the waste is desalted in duplicate on the waste incinerator side and the ash melting furnace side, there is a lot of waste in terms of equipment and effective use of slaked lime.

As shown in FIG. 7 above, CaCl ₂ which is originally not suitable for melting and solidification is contained in the ash treated in the ash melting furnace.
And unreacted slaked lime that does not require melting and solidification is 10% in total
The above is also included, and the melting energy for this is wasted.

Since the combustion ash, which was originally 800 to 950 ° C. in the refuse incinerator, is cooled to about 100 to 150 ° C. and then heated again to 1500 ° C. or higher, a large amount of heat energy is wasted.

Since two systems such as a gas cooler, an air preheater and a bag filter are required, the system becomes complicated and expensive.

An object of the present invention is to solve the above disadvantages of the prior art, to provide a facility for melting refuse incineration ash with a simple system configuration, excellent durability and environmental friendliness, easy maintenance, and less energy consumption. To provide.

[0018]

In order to achieve the above-mentioned object, the present invention provides a waste incineration ash equipped with a waste incinerator and an ash melting furnace for melting the waste incinerator ash discharged from the incinerator. In the melting facility, a dust collector is provided at the exit of the refuse incinerator, and the ash outlet of the dust collector and the ash supply port of the ash melting furnace are connected by a pipe line.

[0019]

[Function] Cyclone dust collectors, etc.
Can withstand high temperatures. Such a high-temperature dust collector is provided at the exit of the refuse incinerator, the incinerator ash discharged from the refuse incinerator is collected before the desalting agent is blown, and the incinerated ash is sent to the ash melting furnace to be melted. Since almost no chloride is contained therein, generation of HCl and the like from the ash melting furnace can be significantly reduced. Therefore, environmental pollution is prevented, corrosion of the ash melting furnace and devices and flues arranged downstream thereof is reduced, and maintenance is facilitated.

Further, when the incinerated ash discharged from the refuse incinerator is directly introduced into the ash melting furnace and melted in this manner, the generation of HCl and the like from the ash melting furnace can be significantly reduced.
The desalination process for the outlet gas of the ash melting furnace becomes unnecessary, the system configuration can be simplified, and the amount of the desalting agent used can be halved.

Furthermore, when the incineration ash discharged from the refuse incinerator is directly introduced into the ash melting furnace and melted in this way, excess CaCl ₂ and unreacted ash are collected in the ash collected by the high temperature dust collector. Since Ca (OH) ₂ is not contained in the ash melting furnace, the amount of processing in the ash melting furnace can be reduced and the energy consumption in the ash melting furnace can be reduced.

Further, when the ash discharge pipe of the high temperature dust collector and the ash melting furnace are directly connected to each other, cooling of the ash by heat radiation is prevented, so that energy consumption in the ash melting furnace can be reduced also from this point. .

[0023]

【Example】

<First Embodiment> An ash melting facility according to the first embodiment will be described with reference to the system configuration diagram of FIG.

In this figure, 50 is a high temperature cyclone,
51 is an ash discharge pipe of the high-temperature cyclone 50, 52 is an ash supply pipe of the ash melting furnace 19, 53 is a water pipe, 54 is an opening / closing valve provided in the water pipe 53, 55 is a reactor pressure controller, 56 is a differential pressure gauge, 57
Is an outlet pipe of the gas cooler 35, 58 is a pressure adjusting damper provided in the outlet pipe 57, and the other parts corresponding to those in FIG. 6 have the same reference numerals.

The high temperature cyclone 50 is lined with a refractory material so that the gas temperature at the outlet of the refuse incinerator 2 is 7
The dust collector is configured to withstand a high temperature of 00 ° C. to 950 ° C. and is connected to the outlet of the refuse incinerator 2. The ash discharge pipe 51 of the high temperature cyclone 50 and the ash supply pipe 52 of the ash melting furnace 19 are directly connected to each other, and the ash collected by the high temperature cyclone 50 is prevented from being cooled by heat radiation as much as possible. 19 can be supplied. In addition, the ash discharge pipe 51 and the ash supply pipe 52 are 45 with respect to the horizontal plane.
It is set to be inclined at an angle of not less than 10 degrees, and the collected ash of the high temperature cyclone 50 can be smoothly supplied to the ash melting furnace 19.

The water-cooled bypass pipe 53 is provided when the ash supply pipe 52 or the ash melting furnace 19 has some trouble.
It is provided to temporarily release the collected ash of the high temperature cyclone 50 to another hopper (not shown), and when the trouble occurs, the collected ash is supplied to the ash supply pipe 52, The ash is not sent to the melting furnace 19 and is discharged to another place.

The differential pressure gauge 56 detects the differential pressure between the internal pressure of the ash melting furnace 19 and the internal temperature of the high temperature cyclone 50. The in-furnace pressure controller 55 adjusts the opening degree of the pressure adjusting damper 58 according to the detection value of the differential pressure gauge 56 so that the in-furnace pressure of the ash melting furnace 19 is always lower than the internal pressure of the high temperature cyclone 50. To control.

The other parts designated by the same reference numerals as those in FIG. 6 have already been described in the section of the prior art, and the description thereof will be omitted to avoid duplication.

The operation of the refuse incineration ash melting facility according to this example will be described below.

From the input chute 1 to the refuse incinerator 2
It is incinerated in the refuse incinerator 2 by the combustion air that is thrown in and supplied from the blower 13. Combustion air from the blower 13 is preheated via the air preheater 4, then primary air that has passed through the valve 14 and 2 that has passed through the valve 15.
It is separated into the next air and introduced into the refuse incinerator 2. Combustion gas generated from the refuse incinerator 2 is introduced into the high-temperature cyclone 50 via the pipe 2a, and incinerator ash is separated.
The combustion gas removed by the high-temperature cyclone 50 is cooled by the gas cooler 3 and exhausted through the air preheater 4, the gas cooler 5, the bag filter 6, and the chimney 12.
The exhaust of the combustion gas is performed by the induction pump 9.

The combustion gas that has passed through the high-temperature cyclone 50 contains several hundred ppm of HCl due to chlorine in the refuse. To remove (desalt) this, slaked lime hopper 3
The powdered slaked lime from 1 is blown into the flue 34 by air flow conveyance through the quantitative feeder 32, and the gaseous HCl is changed into solid CaCl ₂ by the reaction represented by the above chemical formula, and the bag filter 6 is used. Collected with the incinerated ash of garbage. In addition, low boiling point metals such as mercury, cadmium, and arsenic are vaporized in the waste incinerator 2 and are contained in the combustion gas of the waste, but these are turned into solid particles by cooling them to about 200 ° C by the gas cooler 5. Therefore, it can be collected by the bag filter 6.

The ash collected by the bag filter 6 enters the ash stabilizer 36 through the relay hopper 40 and the valve 41,
Due to the action of the solidified drug supplied from the drug supply pipe 37, harmful substances such as CaCl ₂ , mercury, and lead contained in high concentration in the ash are stabilized. The ash after the stabilization process is discharged to the outside through the discharge pipe 38.

Ash containing almost no chloride collected by the high temperature cyclone 50 is ashed out pipe 51 and ash supply pipe 52.
It is conveyed to the ash melting furnace 19 through and is melted by the high temperature flame of the heavy oil burner 20. The molten ash flows down the furnace wall of the ash melting furnace 19 and the slag tap 21 and falls into the slag hopper 22 to be solidified.

On the other hand, 1400 to 1400 generated in the ash melting furnace 19
The high-temperature exhaust gas of 1600 ° C. is cooled to 300 to 500 ° C. by the gas cooler 35 so that the pressure adjusting damper 58 installed downstream is not damaged, and then the pressure adjusting damper 58.
Via the air preheater 4 to join the combustion gas from the refuse incinerator 2 at the inlet of the air preheater 4, and desalination and dust removal are performed by the above-mentioned procedure.

The backflow of high-temperature exhaust gas from the ash melting furnace 19 to the high-temperature cyclone 50 is prevented by adjusting the opening of the pressure adjusting damper 58 with the in-furnace pressure controller 55.
That is, in the refuse incinerator 2, the combustion gas is usually sucked by the induced air blower 9 so that the in-furnace gas of the refuse incinerator 2 is not exposed to the outside, and the in-furnace pressure is almost equal to or slightly negative than the atmospheric pressure. A so-called balanced ventilation system is used as pressure. Therefore, in the system from the waste incinerator 2 to the induced air blower 9, the pressure in the waste incinerator 2 is the highest (approximately 0 mm).
H ₂ O), and on the downstream side thereof, the flue pressure becomes lower as it reaches the downstream side according to the pressure loss of each device, and finally the inlet part of the induced blower 9 has the lowest pressure, − The negative pressure is several hundred mmH ₂ O. Therefore, the pressure at the inlet of the air preheater 4 shown in FIG. 1 is always lower than the pressure inside the high-temperature cyclone 50, and therefore the pressure inside the ash melting furnace 19 is controlled by opening and closing the pressure adjusting damper 58. The internal pressure of 50 can be controlled to be always lower than the internal pressure. In this way, the backflow of high-temperature exhaust gas from the ash melting furnace 19 to the high-temperature cyclone 50 is prevented, so that the flow of ash from the high-temperature cyclone 50 to the ash-melting furnace 19 is smooth and the ash inside the high-temperature cyclone 50 is also reduced. It is possible to prevent problems such as melt fixing.

In the ash melting furnace 19, the furnace pressure changes as the amount of ash supplied increases and decreases. To cope with this, a known normal furnace temperature control circuit (not shown) is used to control the amount of heavy oil and combustion. Stabilization is achieved by controlling the amount of air used. In addition, as a result, ash can be stably melted and discharged regardless of the increase or decrease in the amount of ash supplied.

The ash melting equipment of this example is 700 ° C. to 950 ° C.
A high temperature cyclone 50 that can withstand the high temperature of is disposed at the outlet of the waste incinerator 2 to collect incineration ash containing almost no chloride discharged from the waste incinerator 2 and send it to the ash melting furnace 19 for melting. The generation of HCl from the ash melting furnace 19 can be significantly reduced. Therefore, environmental pollution is prevented, corrosion of the ash melting furnace 19 and devices and flues arranged downstream thereof is reduced, and maintenance is facilitated.

In addition, the ash melting equipment of this example has a confluent conduit 34.
The slaked lime that is a desalting agent is blown into only
Further, as described above, since the generation of HCl from the ash melting furnace 19 can be significantly reduced, the amount of slaked lime used can be halved as compared with the conventional equipment, as shown in FIG.

Further, in the ash melting equipment of this example, the incinerated ash discharged from the waste incinerator 2 which does not contain excess CaCl ₂ or unreacted slaked lime is directly sent to the ash melting furnace 19 to be melted. The throughput of the furnace can be reduced and the energy consumption in the ash melting furnace can be saved.

Further, in the ash melting equipment of this example, since the high temperature cyclone 50 and the ash melting furnace 19 are directly connected, cooling of the ash by heat radiation is prevented, and from this point also the energy consumption in the ash melting furnace 19 is saved. Can be planned. FIG. 3 shows the relationship between the temperature of ash supplied to the ash melting furnace 19 and the ratio of the amount of molten ash to the amount of heavy oil used (hereinafter referred to as ash / heavy oil ratio).
As is clear from this graph, in order to keep the furnace temperature of the ash melting furnace 19 at 1500 ° C. or higher required for the ash melting process, when the ash temperature supplied to the ash melting furnace 19 is 150 ° C. It is necessary to operate the fuel oil / heavy oil ratio at 6.2 or less, but if the ash temperature is 900 ° C, the ash / heavy oil ratio can be 12, and the amount of ash that can be melt-processed with a unit weight of heavy oil is almost the same. You can see that it can be doubled.

<Second Embodiment> FIG. 4 shows an ash melting facility according to the second embodiment. In this figure, reference numeral 60 denotes an L valve, and other parts corresponding to those in FIG. 1 described above are denoted by the same reference numerals. As is clear from this figure, the ash melting facility of this example is provided with an L valve 60 as a device for stabilizing the ash supply amount to the ash melting furnace 19 between the high temperature cyclone 50 and the ash melting furnace 19. Is provided.

As shown in FIG. 5, the L valve 60 is provided with an ash storage container 61 provided so as to cover an ash introduction hole 19a formed in the furnace wall of the ash melting furnace 19, and a lower portion of the ash storage container 61. And an ash discharge pipe 51, an L-shaped pipe 62, a first air supply pipe 63 for supplying operating air to the lower portion of the ash storage container 61, and a bent portion P of the L-shaped pipe 62 for operation. It is mainly composed of a second air supply pipe 64 for supplying air, and valves 65 to 67 for adjusting the amount of air provided in the respective pipelines. The ash container 61 is divided into an upper portion 61a and a lower portion 61b via an air dispersion plate 68, and ash from the high temperature cyclone 50 is introduced into the upper portion 61a.

During normal operation, that is, when the refuse incinerator 2 is operated at a constant load, a constant amount of air is constantly supplied through the valves 66 and 67 to the first air supply pipe 63 and the second air supply pipe 64. Is supplied to. In this state, the ash accumulated in the ash storage container 61 is blown up by the working air supplied through the first air supply pipe 63 and maintains a gentle flow state. On the other hand, the operating air supplied to the bent portion P of the L-shaped pipe 62 through the second air supply pipe 64 is the bent portion P → L-shaped pipe 62 → ash storage container 61 → ash introduction hole 19a.
It is divided into air entering the ash melting furnace 19 via the bent portion P → L-shaped tube 62 → air entering the high temperature cyclone 50 via the ash discharge tube 51. The distribution ratio is the inverse ratio of the ventilation resistance of each path.

During normal operation, a certain amount of ash always remains in the ash discharge pipe 51 to form a packed bed. The amount of ash at this time is level B. At this time,
High temperature cyclone 5 from bent portion P via ashing pipe 51
Most of the working air flows from the bent portion P through the L-shaped pipe 62 due to the high airflow resistance of the pipeline reaching 0.
to go into. Therefore, the ash storage container 6 that constitutes the fluidized bed
The ash in 1 is conveyed to this working air and the ash introduction hole 19
The ash according to the amount of ash supplied to the ash melting furnace 19 is supplied from a to the ash melting furnace 19 and is introduced into the ash storage container 61 from the ash discharging pipe 51 through the L-shaped pipe 62. Therefore, at this time, ash is stably supplied to the ash melting furnace 19.

For some reason, the amount of collected ash in the high temperature cyclone 50 becomes lower than the amount of collected ash during normal operation, and the ash discharge pipe 5
When the amount of ash in 1 decreases to the level C, the ventilation resistance of the pipe path from the bent portion P to the high-temperature cyclone 50 via the ash discharge pipe 51 decreases, so that an L-shape is provided through the second air supply pipe 64. Most of the working air supplied to the bent portion P of the pipe 62 flows to the high temperature cyclone 50 side. As a result, the air flow rate entering the ash melting furnace 19 from the bent portion P via the L-shaped tube 62 is reduced, and the amount of ash supplied from the ash introduction hole 19a to the ash melting furnace 19 is also reduced. Finally, the level of the packed bed is stabilized at a height commensurate with the amount of ash collected.

Even if the supply of the collected ash by the high temperature cyclone 50 is interrupted, the level of the packed bed does not fall below the set position (level C) of the ash introduction hole 19a. The reason is that when the amount of ash in the ash outlet pipe 51 decreases to level C, most of the working air supplied to the bent portion P of the L-shaped pipe 62 through the second air supply pipe 64 is directed to the high temperature cyclone 50 side. Because it flows, the ash in the ash storage pipe 61 is fluidized together with the ash in the ash storage container 61, and behaves similarly to a fluid. Also in this case, the amount of air flowing into the high-temperature cyclone 50 from the second air supply pipe 64 via the ashing pipe 51 is a minute amount of 1/1000 or less of the amount of combustion gas passing through the high-temperature cyclone 50. Therefore, the solid-gas separation in the high temperature cyclone 50 does not cause any inconvenience.

On the contrary, for some reason, the high temperature cyclone 5
When the amount of collected ash of 0 exceeds the amount of collected ash during normal operation and the amount of ash in the ash extraction pipe 51 rises to level A, the bent portion P
Since the ventilation resistance of the pipeline from the ash extraction pipe 51 to the high-temperature cyclone 50 increases, the second air supply pipe 6
4 to the bent portion P of the L-shaped pipe 62, and the L-shaped pipe 6
The flow rate of air entering the ash melting furnace 19 via 2 increases, and accordingly, the amount of ash supplied from the ash introduction hole 19a to the ash melting furnace 19 increases. Finally, the level of the packed bed is stabilized at a height commensurate with the amount of ash collected.

As described above, when the L valve 60 is set between the high temperature cyclone 50 and the ash melting furnace 19, even if the amount of ash supplied from the high temperature cyclone 50 suddenly changes, the L valve 60
Serves as a buffer, and the increase or decrease in the amount of ash supplied to the ash melting furnace 19 is mitigated, so that stable ash melting processing can be performed at all times. The buffer effect can be arbitrarily set by increasing or decreasing the volume from the ash discharge pipe 51 to the ash storage container 61.

The change in the amount of ash supplied from the high temperature cyclone 50 is rapid, and the ash accumulated in the ash discharge pipe 51 is changed to the high temperature cyclone 50.
If there is a risk of overflow, the bypass pipe 71 is installed at the outlet of the high temperature cyclone 50 as shown in FIG.
A bypass hopper 72 is connected in series through the bypass hopper 72, and a detector 73 detects that ash from the high-temperature cyclone 50 has flown into the bypass hopper 72, and a valve from the controller 6 is detected by a signal from the controller 74.
It is also possible to increase the opening degree of 5 to promote the ash supply to the ash melting furnace 19. In this case, in order to notify the operator of the occurrence of overflow, the alarm device can be activated in response to the signal from the detector 73. As the detector 73, a temperature detector or a level switch can be used. The ash accumulated in the bypass hopper 72 is
It is discharged to the outside through the water cooling valve 75.

In the ash melting facility of this example, the L valve 60 or the ash melting furnace 1 is used as in the apparatus of the first embodiment.
When some trouble occurs in 9, a water cooling bypass pipe 53 and an on-off valve 54 may be provided to prevent the collected ash from being sent to the L valve 60 or the ash melting furnace 19 which has stopped functioning due to the trouble.

In each of the above embodiments, the equipment provided with the heavy oil combustion type ash melting furnace has been described as an example.
The present invention can also be applied to equipment equipped with an ash melting furnace of another system, for example, an electric heating system, and the same effect as in the case of the above-mentioned embodiment can be obtained.

[0052]

As described above, according to the present invention,
A dust collector that can withstand a high temperature of 700 ° C to 950 ° C is installed at the exit of the refuse incinerator, and the incinerated ash discharged from the refuse incinerator that contains almost no chloride is collected and sent to the ash melting furnace for melting. Therefore, generation of HCl from the ash melting furnace can be significantly reduced. Therefore, environmental pollution is prevented and
Corrosion of the ash melting furnace and the devices and flues arranged downstream thereof is reduced, facilitating maintenance. In addition, since the incineration ash that does not contain excess CaCl ₂ or unreacted slaked lime discharged from the waste incinerator is sent directly to the ash melting furnace and melted, the throughput of the ash melting furnace can be reduced, and the ash melting furnace can be reduced. Energy consumption can be reduced. Furthermore, since the high temperature cyclone and the ash melting furnace are directly connected, cooling of the ash due to heat radiation is prevented, and from this point as well, energy consumption in the ash melting furnace can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ash melting facility according to a first embodiment.

FIG. 2 is a graph showing the effect of the present invention.

FIG. 3 is a graph showing the effect of the present invention.

FIG. 4 is a configuration diagram of an ash melting facility according to a second embodiment.

FIG. 5 is an explanatory diagram of an L valve.

FIG. 6 is a configuration diagram of an ash melting facility according to a conventional example.

FIG. 7 is a graph showing the problems of the prior art.

[Explanation of symbols]

 2 Waste incinerator 3, 5 Gas cooler 4 Air preheater 6 Bag filter 13 Blower 19 Ash melting furnace 31 Ash lime hopper 32 Slaked lime quantitative feeder 37 Chemical supply pipe 50 High temperature cyclone (high temperature dust collector) 51 Ash discharge pipe 52 Ash ash supply Pipe 53 Water pipe 54 Open / close valve 55 In-furnace pressure controller 56 Differential pressure gauge 58 Pressure adjustment damper 60 L valve 61 Ash storage container 62 L-shaped pipe 63 First air supply pipe 64 Second air supply pipe 65-67 valve

[Procedure amendment]

[Submission date] August 1, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Matsuda 3-36 Takaracho, Kure-shi, Hiroshima Babcock Hitachi Ltd. Kure Research Institute (72) Miki Ueda 3-36 36 Takaracho, Kure-shi, Hiroshima Babcock Hitachi Ltd. Kure Institute

Claims (7)

[Claims] 1. A waste incineration ash melting facility comprising a waste incinerator and an ash melting furnace for melting the waste incinerator ash discharged from the incinerator, and a dust collector is provided at the outlet of the waste incinerator. A facility for melting refuse incinerated ash, characterized in that an ash outlet of the dust collector and an ash supply port of the ash melting furnace are connected by a pipe line. 2. The incinerator ash according to claim 1, wherein a pipe connecting the dust collector and the ash melting furnace is inclined at an angle of 45 degrees or more with respect to a horizontal plane. Melting equipment. 3. The apparatus for melting refuse incinerated ash according to claim 1, further comprising a bypass pipe connected to a pipe line connecting the dust collector and the ash melting furnace. 4. The apparatus according to claim 1, wherein a desalting agent is blown into a confluence line of an exhaust gas pipe extending from the dust collector and an exhaust gas pipe extending from the ash melting furnace. Waste incineration ash melting facility. 5. The apparatus according to claim 1, further comprising an in-furnace pressure controller for controlling the in-furnace pressure of the ash melting furnace to be always lower than the internal pressure of the dust collector. A melting facility for refuse incineration ash. 6. The ash-melting apparatus according to claim 1, wherein the ash-melting device is connected to the pipe connecting the dust-collector and the ash-melting furnace even when the amount of ash discharged from the dust-collector changes. A facility for melting refuse incinerated ash, which is equipped with an ash amount stabilization device that automatically stabilizes the ash amount supplied to the furnace. 7. The apparatus according to claim 6, wherein an amount of ash staying in a pipe line connecting the dust collector and the ash melting furnace is provided in an ash outlet of the dust collector or a portion communicating with the ash outlet. A detector is provided to detect whether or not a predetermined value is exceeded, and when the amount of ash staying in the pipeline exceeds a predetermined value, a signal from the detector causes the ash melting by the ash amount stabilizing device. A facility for melting refuse incineration ash, which is characterized by automatically increasing the amount of ash supplied to the furnace.