JP6772004B2 - Combustion processing equipment and its operation method - Google Patents

Description

The present invention relates to a combustion treatment apparatus and an operation method thereof. More specifically, the combustible gas generated by heat-treating an object to be treated in a heat treatment furnace is burned in a secondary combustion furnace connected to the heat treatment furnace. It relates to the combustion processing apparatus to process and the operation method thereof.

In the past, sludge was the main target for incineration of industrial waste, but from around 2010, industrial waste such as substrate waste, ASR (Automobile Shredder Residue), shredder dust, and waste plastic has increased. ing. Substrate scrap contains precious metals (gold, silver, platinum, palladium, etc.) and metals such as copper and aluminum, and recovery of these precious metals is extremely important from the viewpoint of resource saving by recycling resources. is there. Therefore, these industrial wastes are recycled by various methods.

As one of the recycling methods, there is one shown in Patent Document 1. This noble metal scrap processing device heats the noble metal scrap in the first combustion furnace to thermally decompose and gasify it, and further burns the gasified volume-reduced product, which is the residue after gasification, in the second combustion furnace. It is treated, the incineration ash is cooled to a predetermined temperature in a water tank, and then continuously recovered by a conveyor. The configuration consists of a first combustion furnace and a second combustion that burns a gasified volume reduction product. A furnace, a third combustion furnace that burns flammable thermal decomposition gas, a cooling tower that cools the exhaust gas generated in the third combustion furnace, and incineration of precious metal scrap that was burned in the second combustion furnace. It is equipped with a water-sealed conveyor that cools and conveys ash. This makes it possible to easily recycle precious metals, prevent deterioration of durability due to overheating of the first combustion furnace, and prevent the danger of dioxin generation and ignition of incineration ash. ..

Further, in the reduction treatment apparatus shown in Patent Document 2, the life of the furnace wall is extended by further installing a cooling water spray nozzle in the secondary combustion chamber to monitor the temperature inside the furnace and control it within the control value. In addition, decomposition of dioxins and incomplete combustion of flammable gas can be suppressed.

Japanese Unexamined Patent Publication No. 2015-148397 Patent No. 5189873

As described above, the industrial waste to be treated tends to gradually shift from sludge and the like to substrate waste, ASR, shredder dust, and waste plastic, but these industrial wastes generate a calorific value in conventional industries. Larger than waste. Therefore, the temperature fluctuation (rise) of the secondary combustion furnace at the time of feeding the raw material becomes large, and the temperature control value may be greatly deviated. In that case, the input of raw materials is temporarily stopped to suppress the temperature rise in the secondary combustion furnace. However, such temperature control has a problem that the temperature fluctuation in the furnace is large, spalling occurs in the refractory in the furnace, and the life of the refractory in the furnace wall of the secondary combustion chamber is shortened. Further, there is a problem that the processing amount is limited when the temperature is controlled only by adjusting the supply amount of the raw material.

Therefore, in view of the above problems, the present invention suppresses abrupt fluctuations in the temperature in the secondary combustion chamber to reduce the fluctuation range of the temperature in the furnace, thereby causing spalling of the refractory material in the furnace wall of the secondary combustion furnace. It is an object of the present invention to provide a combustion treatment apparatus capable of suppressing and extending its life, and an operation method thereof.

Further, the present invention provides a combustion treatment device capable of treating waste liquid and an operation method thereof.

In order to solve the above problems, the present invention according to claim 1 is a secondary combustion chamber in which a flammable gas generated by heat-treating an object to be treated in a heat-treatment chamber is continuously provided in the heat-treatment chamber. In a combustion processing apparatus for combustion processing, the combustible gas that is above the discharge port of the heat treatment furnace that opens toward the secondary combustion chamber and is discharged from the discharge port into the secondary combustion chamber is discharged. A secondary combustion chamber burner installed on the furnace wall of the secondary combustion chamber at a position where combustion can be performed from the lateral direction, and the two above the secondary combustion chamber burner and on the side facing the discharge port. A cooling water spray nozzle installed on the furnace wall of the secondary combustion chamber and formed so that cooling water can be sprayed toward the furnace wall above the discharge port of the heat treatment furnace, and the temperature in the secondary combustion chamber are detected. A temperature detector installed on the furnace wall of the secondary combustion chamber located below the secondary combustion burner and near the upper side of the discharge port, and the secondary combustion chamber. It is characterized by including a burner output adjusting unit for adjusting the output of the burner and a cooling water flow rate adjusting unit for adjusting the amount of the cooling water sprayed from the cooling water spray nozzle.

In order to solve the above problems, the present invention according to claim 2 is the burner output adjusting unit according to claim 1, so that the secondary combustion chamber is maintained in a predetermined temperature range in the combustion processing apparatus according to claim 1. It is characterized by including a control unit that controls the operation of the cooling water flow rate adjusting unit.

In order to solve the above problems, the present invention according to claim 3 is the temperature detection of the furnace wall of the secondary combustion chamber facing the discharge port in the combustion processing apparatus according to claim 1 or 2. A waste liquid spray nozzle provided at a position higher than the vessel and lower than the secondary combustion burner is further provided, and the waste liquid spray nozzle is provided with a waste liquid flow rate adjusting unit for adjusting the amount of waste liquid sprayed from the waste liquid spray nozzle. It is characterized in that the waste liquid can be heat-treated at the same time as the heat treatment of the object to be treated.

In order to solve the above problems, the present invention according to claim 4 is the combustion processing apparatus according to claim 3, wherein the control unit further controls the operation of the waste liquid flow rate adjusting unit from the waste liquid spray nozzle. The feature is that the spray amount of the waste liquid to be sprayed can be adjusted.

In order to solve the above problems, the present invention according to claim 5 is a secondary combustion furnace in which a combustible gas generated by heat-treating an object to be treated in a heat-treatment furnace is continuously provided in the heat-treatment furnace. In the operation method of the combustion processing apparatus for combustion processing, the secondary combustion is performed from the discharge port by a secondary combustion chamber burner provided above the discharge port of the heat treatment furnace that opens toward the secondary combustion chamber. It was installed on the furnace wall of the secondary combustion chamber, which is located below the secondary combustion burner and near the upper side of the discharge port, and a step of burning the combustible gas discharged into the chamber from the lateral direction. A step of detecting the temperature in the secondary combustion chamber by a temperature detector and a step installed on the furnace wall of the secondary combustion chamber above the secondary combustion chamber burner and facing the discharge port. The output of the secondary combustion chamber burner and the step of cooling the secondary combustion chamber by spraying the cooling water toward the furnace wall above the discharge port of the heat treatment furnace by the cooling water spray nozzle are included. The secondary combustion chamber is maintained at a predetermined temperature range by controlling the amount of cooling water sprayed from the cooling water spray nozzle.

In order to solve the above problems, the present invention according to claim 6 sets the temperature in the secondary combustion chamber between 800 and 1,200 ° C. in the operation method of the combustion processing apparatus according to claim 5. It is characterized in that the fluctuation range is controlled to be within the range of 200 ° C.

In order to solve the above problems, the present invention according to claim 7 has a fluctuation range of the temperature in the secondary combustion chamber within ± 5 ° C. per minute in the operation method of the combustion processing apparatus according to claim 6. It is characterized in that the output of the secondary combustion chamber burner and the amount of cooling water sprayed from the cooling water spray nozzle are controlled so as to have a fluctuation range.

In order to solve the above problems, the present invention according to claim 8 further increases or decreases the supply amount of the object to be processed in the operation method of the combustion processing apparatus according to any one of claims 5 to 7. It is characterized in that the temperature in the secondary combustion chamber is controlled by the above.

In order to solve the above problems, the present invention according to claim 9 further comprises the secondary combustion facing the discharge port in the operation method of the combustion processing apparatus according to any one of claims 5 to 8. The waste liquid is sprayed by arranging the waste liquid spray nozzle at a position higher than the temperature detector and lower than the secondary combustion burner in the furnace wall of the chamber and spraying the waste liquid from the waste liquid spray nozzle into the secondary combustion chamber. It is characterized by heat treatment.

According to the combustion treatment apparatus and its operation method according to the present invention, when the combustible gas after the object to be treated is thermally decomposed by the heat treatment furnace is burned in the secondary combustion furnace connected to the heat treatment furnace. A secondary combustion burner that burns flammable gas and a cooling water spray nozzle located above the secondary combustion chamber burner keep the temperature in the secondary combustion chamber within a predetermined range, thereby maintaining the temperature in the secondary combustion chamber. By reducing the fluctuation range of the temperature, it is possible to suppress the occurrence of spalling of the fireproof material on the furnace wall of the secondary combustion furnace above the discharge port of the heat treatment furnace, and to further extend its life than before. There is.

In addition, the cooling water spray nozzle sprays cooling water toward the furnace wall above the discharge port of the heat treatment furnace where spalling is likely to occur, and the secondary combustion burner is flammable and discharged into the secondary combustion chamber. Since the gas is burned from the side, it is possible to suppress temperature fluctuations near the furnace wall above the discharge port of the heat treatment furnace, suppress the occurrence of spalling, and extend its life. effective. Further, since the replacement period of the refractory in the furnace is extended, there is an effect that the operation efficiency and the operation cost can be improved.

Further, according to the combustion treatment apparatus and the operation method thereof according to the present invention, there is an effect that waste liquid can be treated.

It is a block diagram which shows one preferable embodiment of the combustion processing apparatus which concerns on this invention. It is a vertical sectional view of the combustion processing apparatus shown in FIG. It is a block diagram which shows the structure of a control part. It is a float chart which shows the operation method of the combustion processing apparatus which concerns on this invention. It is a flowchart which shows the furnace temperature control of a secondary combustion chamber. It is a vertical sectional view which shows the 3rd Embodiment of the combustion processing apparatus which concerns on this invention. It is a top sectional view of the combustion processing apparatus shown in FIG.

1. 1. First Embodiment [Combustion processing apparatus configuration]
Hereinafter, the combustion treatment apparatus according to the present invention and its operation method will be described in detail based on a preferred embodiment. FIG. 1 is a block diagram showing a preferred embodiment of the combustion processing device according to the present invention, and FIG. 2 is a vertical sectional view of the combustion processing device shown in FIG. The illustrated combustion treatment apparatus 1 is roughly configured to include a rotary kiln 2 as a heat treatment furnace and a secondary combustion furnace 4 connected to the rotary kiln 2. A stoker furnace 3 is arranged below the secondary combustion furnace 4.

The rotary kiln 2 is provided with a cylindrical horizontal rotary furnace 21, and is provided with a charging port 22 for charging the object to be processed 10 (see FIG. 2) on one end surface, and on the opposite end surface. A discharge port 23 is provided. Here, examples of the object 10 to be treated include sludge, substrate waste, ASR, shredder dust, waste plastic, and the like. The rotary furnace 21 is arranged so that the discharge port 23 side is slightly inclined downward from the input port 22, and is rotatable by a drive source (motor) (not shown). A kiln burner 24 is arranged in the vicinity of the input port 22, and by burning fuel such as heavy oil, a flame is blown out toward the inside of the furnace, whereby the object to be processed 10 can be heated. .. It is not necessary to always use the kiln burner 24 because the gasification of the object 10 to be processed by thermal decomposition proceeds continuously, but when the temperature inside the furnace drops, the kiln burner 24 is fired to keep the inside of the furnace at a high temperature. .. Further, a cooling water spray nozzle 28 for spraying cooling water into the rotary furnace 21 is arranged in the vicinity of the inlet 22. The operation of the cooling water spray nozzle 28 and the kiln burner 24 is controlled by a control unit 100 (see FIG. 3) described later.

In the case of incinerating general industrial waste or the like, the temperature inside the furnace is generally maintained at a high temperature of 800 ° C. or higher, but the combustion treatment device 1 does not burn the object 10 to be processed. As will be described later, the object 10 to be processed is thermally decomposed by keeping the temperature of the flammable gas discharged from the discharge port 23 at 660 to 1200 ° C. while preventing the invasion of free air into the furnace. And gasifies it. Then, the object 10 to be charged into the furnace from the input port 22 gradually moves toward the discharge port 23 while being agitated in a high temperature atmosphere, and is thermally decomposed into a flammable gas and gasification volume reduction. It becomes the object 11 (see FIG. 2). The gasification volume reduction product 11 refers to a residue after gasification.

The gasification volume reducing material 11 discharged from the discharge port 23 is processed in the stoker furnace 3, and the combustible gas is introduced into the secondary combustion furnace 4 for combustion processing. The rotation speed of the rotary furnace 21 in the present invention is configured to be able to be rotated in the range of 0.28 to 0.9 rpm by a speed reducer (not shown), and the object to be processed 10 is processed at such a rotation speed. It can be kept in the rotary furnace 21 for about 50 minutes for thermal decomposition by preventing the short pass.

On the other hand, the flammable gas generated by thermally decomposing the object 10 to be processed is introduced into the secondary combustion furnace 4. The secondary combustion furnace 4 is provided with a secondary combustion chamber burner 46 that burns and processes the flammable gas introduced into the secondary combustion chamber 4a. The secondary combustion chamber burner 46 is installed at a position where it can burn laterally with respect to the flammable gas discharged from the discharge port 23 of the rotary kiln 2. In the present embodiment, the secondary combustion chamber burner 46 fires flames from a direction orthogonal to the direction in which flammable gas is discharged so that the flame does not face the furnace wall above the discharge port 23 where spalling is likely to occur. It is arranged to blow out.

On the other hand, a first temperature detector 39a is arranged on the furnace wall of the secondary combustion chamber 4a located near the upper side of the discharge port 23 of the rotary furnace 21 that opens toward the inside of the secondary combustion chamber 4a. The first temperature detector 39a detects the temperature in the secondary combustion chamber 4a which has become a high temperature atmosphere due to the flammable gas discharged from the discharge port 23. Further, a second temperature detector 39b is arranged on the furnace wall of the secondary combustion chamber 4a located above the cooling water spray nozzle 40 and near the ceiling of the secondary combustion chamber 4a. The second temperature detector 39b is installed on the furnace wall on the side where the secondary combustion chamber burner 46 is provided. In this embodiment, both the first temperature detector 39a and the second temperature detector 39b are installed, but the secondary combustion detected by the first temperature detector 39a and the second temperature detector 39b Since there is no significant difference in the temperature in the chamber 4a, only one of them can be arranged. A cooling water spray nozzle 40 for sprinkling cooling water toward the upper part of the discharge port 23 of the rotary furnace 21 is provided on the furnace wall of the secondary combustion chamber 4a on the side facing the discharge port 23. There is. This is to detect the temperature near the furnace wall where spalling is likely to occur and to effectively spray the cooling water on such the furnace wall. Then, the combustible gas burned by the secondary combustion furnace 4 becomes exhaust gas and is sent to the cooling tower 42 via the flue 41, cooled at once so that the temperature becomes about 130 ° C., and a cleaning tower (not shown). , Exhausted into the atmosphere in a completely detoxified state through a mist cotrel.

The flammable gas is completely burned by the burner 46 provided in the secondary combustion chamber 4a, but the combustion exhaust gas generated when the gasification volume reduction product 11 is incinerated in the stoker furnace 3 is also the secondary combustion chamber 4a. It is sent to and completely burned with flammable gas. Here, it is known that the generation of dioxins in an incinerator can be suppressed by decomposing dioxins and their precursors at a high temperature by performing stable complete combustion. Therefore, the combustible gas is burned at a temperature of at least 850 ° C. or higher, preferably 900 ° C. or higher.

The secondary combustion chamber burner 46 is provided with a burner output adjusting unit 46a for adjusting the output. The burner output adjusting unit 46a is arranged in a control panel of a control room (not shown), and the operator is detected by both or one of the first temperature detector 39a and the second temperature detector 39b. The output of the secondary combustion chamber burner 46 can be appropriately adjusted according to the temperature in the secondary combustion chamber 4a. Further, the cooling water spray nozzle 40 is provided with a cooling water flow rate adjusting unit 40a for adjusting the opening degree of a flow rate adjusting valve (not shown) of the cooling water spray nozzle 40 in order to adjust the spray amount of the cooling water to be sprayed. The cooling water flow rate adjusting unit 40a is also arranged on a control panel of a control room (not shown), and the operator is detected by both or one of the first temperature detector 39a and the second temperature detector 39b. The amount of cooling water sprayed from the cooling water spray nozzle 40 can be appropriately adjusted according to the temperature in the next combustion chamber 4a. As shown in FIG. 3, the burner output adjusting unit 46a and the cooling water flow rate adjusting unit 40a can be configured to be automatically controlled by the control unit 100 described later.

[Operation method of combustion processing equipment]
Next, the operation method of the combustion processing apparatus according to the present invention will be described together with the operation of the combustion processing apparatus 1 described above. FIG. 4 is a flow chart showing an operation method of the combustion processing apparatus according to the present invention, and FIG. 5 is a flowchart showing furnace temperature control of the secondary combustion furnace 4.

The object 10 to be processed is crushed to a predetermined size by a crusher (not shown in advance) and stored in a predetermined place. Then, the crushed object 10 to be processed is charged into the rotary furnace 21 of the rotary kiln 2 from the charging port 22 by the charging chute 8 (step S1).

In the rotary kiln 2, the temperature inside the furnace is maintained at, for example, 660 to 1,300 ° C. by the kiln burner 24, and the object to be processed 10 charged from the inlet 22 is prevented from entering free air in such a high temperature atmosphere. While holding the gas for about 40 minutes, it is thermally decomposed into a flammable gas and a gasified volume-reduced product 11 (step S2). At this time, even if the kiln burner 24 is extinguished in the rotary furnace 21, the thermal decomposition of the object to be processed 10 continues, so that the temperature of the flammable gas discharged from the discharge port 23 is 660 to 1,200 ° C. Be maintained. The temperature of the flammable gas is constantly monitored by both or one of the first temperature detector 39a and the second temperature detector 39b.

When the object 10 to be processed is thermally decomposed, the rotary furnace 21 is sufficiently stirred by rotating in the range of 0.28 to 0.9 rpm, and the object 10 to be processed is held in the rotary furnace 21 for about 40 minutes. Perform sufficient thermal decomposition. The gasification volume reducing material 11 gradually moves toward the discharge port 23 due to the rotation of the rotary furnace 21 and its slight inclination, and is sent into the stoker furnace 3 which is the second combustion furnace. On the other hand, the flammable gas is introduced into the secondary combustion furnace 4 connected to the rotary furnace 21.

The object 10 to be pyrolyzed by the rotary kiln 2 becomes a gasification volume reduction product 11 and is sent to the stoker furnace 3 to completely burn combustible substances other than the noble metal-containing incombustible material contained in the gasification volume reduction product 11. Prompt (step S3). Then, the incineration ash 12 after combustion in the stoker furnace 3 is arranged on the lower side as a valuable metal-containing slag. Then, the recovered incineration ash 12 is used, for example, as an intermediate raw material in a copper smelter, so that the precious metal contained in the object to be treated is recovered and recycled.

On the other hand, the flammable gas is burned in the secondary combustion furnace 4 by the secondary combustion chamber burner 46 in a predetermined temperature range (step S5). Specifically, the temperature in the secondary combustion chamber 4a of the secondary combustion furnace 4 is between 800 and 1,200 ° C., and the fluctuation range is within the range of 200 ° C., preferably within the range of 100 ° C. To control. For example, when the fluctuation range is 200 ° C., the temperature in the secondary combustion chamber 4a is in the range of 800 to 1,000 ° C., in the range of 1,000 to 1,200 ° C., or 950 to 1,150 ° C. The fluctuation range is maintained within 200 ° C. between 800 and 1,200 ° C., such as within the range of. If possible, the fluctuation range is preferably within 100 ° C. That is, the temperature of the secondary combustion chamber 4a fluctuates between 800 and 1,200 ° C., for example, within 800 to 900 ° C., within 950 to 1,050 ° C., or within 1,100 to 1,200 ° C. This is because the heat load applied to the furnace wall is further reduced by maintaining the width within 100 ° C.

To perform such temperature adjustment, as shown in FIG. 5, the temperature T in the secondary combustion chamber 4a is monitored by both or one of the first temperature detector 39a and the second temperature detector 39b. (Step S11), the burner output adjusting unit 46a or the cooling water flow rate adjusting unit 40a is operated based on the temperature T. When the preset temperature exceeds a preset value, for example, when the temperature T in the secondary combustion chamber 4a is adjusted in the range of 950 to 1,050 ° C., the cooling water flow rate when the temperature T exceeds 1,000 ° C. The opening degree of a flow control valve (not shown) for cooling water sent to the cooling water spray nozzle 40 via the adjusting unit 40a is adjusted, and a predetermined amount of cooling water is sprayed from the cooling water spray nozzle 40 (steps S13 and S14). The temperature T in the next combustion chamber 4a is adjusted so as not to exceed 1,050 ° C. On the other hand, when the temperature T falls below 1,000 ° C., the output of the secondary combustion chamber burner 46 is increased via the burner output adjusting unit 46a to adjust the temperature T in the secondary combustion chamber 4a so as not to fall below 950 ° C. .. Further, even when the temperature T in the secondary combustion chamber 4a is in the range of 950 to 1,050 ° C., if the temperature T fluctuates to exceed ± 5 ° C. per minute, the cooling water flow rate is adjusted. The amount of cooling water sprayed and the output of the secondary combustion burner 46 are adjusted via the unit 40a and the burner output adjusting unit 46a, and the supply amount of the object to be processed 10 is adjusted as necessary to prevent a sudden temperature change. Control as follows.

Specifically, when the temperature T in the secondary combustion chamber 4a is rising at a rate of 2 to 5 ° C. per minute, for example, the amount of cooling water sprayed by the cooling water spray nozzle 40 is 10 to 50 L / L. Control between min. Further, when the temperature T in the secondary combustion chamber 4a rises at a rate exceeding 5 ° C. per minute, the cooling water spray nozzle 40 is used so that the fluctuation range per minute is within ± 5 ° C. In addition to spraying the cooling water (10 to 50 L / min), the output of the secondary combustion chamber burner 46 is reduced or stopped, and the supply amount of the object 10 to be processed is reduced. On the other hand, when the temperature T in the secondary combustion chamber 4a is decreasing at a rate of 2 to 5 ° C. per minute, for example, the spraying of the cooling water by the cooling water spray nozzle 40 is stopped and the secondary combustion chamber burner Increase the output of 46. When the temperature T in the secondary combustion chamber 4a is decreasing at a rate of less than −5 ° C. per minute, the cooling water is sprayed so that the fluctuation range per minute is within ± 5 ° C. In addition to stopping, the output of the secondary combustion chamber burner 46 is increased. If necessary, the supply amount of the object to be processed 10 is increased. When the temperature T in the secondary combustion chamber 4a rises or falls at a rate of less than 2 ° C. per minute, the spraying of the cooling water by the cooling water spray nozzle 40 is stopped and the secondary combustion chamber burner 46 is used. Hold the output.

As described above, the temperature T in the secondary combustion chamber 4a is continuously monitored by both or one of the first temperature detector 39a and the second temperature detector 39b (step S11), and is preset. It is determined whether or not the temperature is within the specified temperature range (range of 950 to 1,050 ° C. in the above example) (step S12), and the temperature T is secondary so that the fluctuation range is within ± 5 ° C. per minute. The above operation is repeated and continued so that the output of the combustion chamber burner 46 and the amount of cooling water sprayed from the cooling water spray nozzle 40 are controlled and maintained within a preset temperature range.

The exhaust gas after burning the flammable gas is guided to the flue 41 connected to the upper part of the secondary combustion chamber 4a, sent to the cooling tower 42 through the flue 41, and installed in the cooling tower 42. Cooling water is sprayed from a plurality of nozzles (not shown), and the exhaust gas is cooled at once (step S6). As a result, the generation of dioxins is suppressed by passing through the temperature range around 300 ° C., which is said to be the most likely to generate de novo synthesis, which is one of the causes of dioxin generation. The cooled exhaust gas is alkaline-cleaned and then exhausted in a completely detoxified state by removing soot and mist (step S7).

2. Second Embodiment As the second embodiment of the combustion processing apparatus according to the present invention, the temperature adjustment by the worker is mechanically performed by providing the control unit 100 for controlling the burner output adjusting unit 46a and the cooling water flow rate adjusting unit 40a. It can also be a system that automatically controls. FIG. 3 is a block diagram showing the configuration of the control unit. The control unit 100 is configured by using a known computer that processes a program stored and stored in a storage medium such as a memory by a central processing unit (CPU) (not shown). A temperature detector 39 of both or one of the first temperature detector 39a and the second temperature detector 39b is connected to the control unit 100, and the detected value of the temperature T in the secondary combustion chamber 4a is measured. It is designed to be incorporated. Further, a burner output adjusting unit 46a of the secondary combustion burner 46 and a cooling water flow rate adjusting unit 40a of the cooling water spray nozzle 46 are provided in the control unit 100. Further, the operation of the charging chute 8 for supplying the object to be processed 10 to the rotary kiln 2 is also controlled by the control unit 100.

In the combustion processing device provided with the control unit 100, the control shown in FIG. 5 is automatically performed. That is, when the temperature T in the secondary combustion chamber 4a is measured by both or one of the first temperature detector 39a and the second temperature detector 39b (step S11), control is performed based on the temperature T. Part 100 determines whether or not the temperature is “lower limit temperature (for example, 950 ° C.)> T> upper limit temperature (for example, 1,050 ° C.)” (step S12). When the temperature in the secondary combustion chamber 4a exceeds 1,000 ° C. (step S12: over), the control unit 100 operates the cooling water spray nozzle 40 to cool a predetermined amount in the secondary combustion furnace 4. Water is sprayed (steps S13 and S14) to lower the temperature in the secondary combustion chamber 4a. In this case, when the temperature T in the secondary combustion chamber 4a is rising at a rate of 2 to 5 ° C. per minute, the amount of cooling water sprayed by the cooling water spray nozzle 40 is between 10 and 50 L / min. Control with. On the other hand, when the temperature in the secondary combustion chamber 4a rises at a rate exceeding 5 ° C. per minute, the control unit 100 sprays the cooling water (10 to 50 L / min) by the cooling water spray nozzle 40. In addition, the output of the secondary combustion chamber burner 46 is reduced or stopped, and the supply amount of the object 10 to be processed is reduced. When the temperature in the secondary combustion chamber 4a rises or falls at a rate of less than 2 ° C. per minute, the control unit 100 stops spraying the cooling water by the cooling water spray nozzle 40 to stop the spraying of the cooling water in the secondary combustion chamber. Increase the output of the burner 46. Further, when the temperature T in the secondary combustion chamber 4a is decreasing at a rate lower than −5 ° C. per minute, the control unit 100 is cooled so that the fluctuation range per minute is within ± 5 ° C. In addition to stopping the spraying of water, the output of the secondary combustion chamber burner 46 is increased. Further, the control unit 100 increases the supply amount of the object to be processed 10 as needed.

Further, the temperature T in the secondary combustion chamber 4a is measured by both or one of the first temperature detector 39a and the second temperature detector 39b (returning to step S11), and whether the temperature is within the above temperature range. Whether or not it is determined (step S12), and as a result, when it is determined that the temperature is within "lower limit temperature> T> upper limit temperature" (step S12: within the range), it is determined whether or not the predetermined time has elapsed. Then, when the predetermined time has elapsed (step S16: Yes), the process returns to step S11 again, and the subsequent processes are repeatedly executed. The temperature range may be set between 800 and 1,200 ° C., the lower limit temperature may be 925 ° C. and the upper limit temperature may be 1,025 ° C., or the lower limit temperature may be 900 ° C. and the upper limit temperature may be set. It can also be set to 1,100 ° C.

3. 3. Third Embodiment [Combustion processing apparatus configuration]
Next, the third embodiment will be described. FIG. 6 is a vertical sectional view showing a third embodiment of the combustion processing apparatus according to the present invention. This third embodiment has a configuration in which a waste liquid spray nozzle 49 is further added to the secondary combustion chamber 4a in the first embodiment. That is, the waste liquid spray nozzle 49 for spraying the waste liquid is arranged at a position between the first temperature detector 39a and the secondary combustion chamber burner 46 with respect to the height direction. If the first temperature detector 39a is not installed, the waste liquid spray nozzle 49 will be installed at the position where the first temperature detector 39a would be installed and the secondary combustion chamber burner. It is arranged at a position between 46 in the height direction. In FIG. 6, the waste liquid spray nozzle 49 is provided on the furnace wall on the same side as the furnace wall of the secondary combustion chamber 4a in which the cooling water spray nozzle 40 is provided, but the present invention is not limited to this. It can be provided on all or some of the furnace wall on the side where the combustion chamber burner 46 is provided, the furnace wall on the opposite side, or the furnace wall on the side where the temperature detector 39 is provided. .. Then, as shown in FIG. 7, when the waste liquid spray nozzle 49 is provided on the furnace wall on the same side as the furnace wall of the secondary combustion chamber 4a provided with the cooling water spray nozzle 46, the two do not overlap in the vertical direction. It is preferable that the positions are staggered as described above. Further, the waste liquid spray nozzle 49 can be formed so as to appropriately adjust the spray amount by providing a waste liquid flow rate adjusting unit (not shown) on a control panel or a control unit 100 (not shown). Here, the waste liquid includes, for example, factory waste liquid such as waste acid and waste alkali. As a result, the heat treatment of the object 10 to be treated and the heat treatment of the waste liquid can be performed at the same time.

As described above, in the third embodiment, the waste liquid can be heat-treated by spraying the waste liquid into the secondary combustion chamber 4a from the waste liquid spray nozzle 49. Therefore, a separate treatment system for the waste liquid treatment is provided. It is not necessary to provide the equipment, and the equipment cost can be reduced. Further, the spray of the waste liquid from the waste liquid spray nozzle 49 can also be used for cooling the inside of the secondary combustion chamber 4a.

As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the specific embodiments described in detail, and is within the scope of the gist of the present invention described in the claims. Needless to say, various modifications and changes are possible.

1 Combustion processing equipment 2 Rotary kiln 3 Stoker furnace 4 Secondary combustion chamber 4a Secondary combustion chamber 8 Input chute 10 Processed object 11 Gasification volume reduction 12 Incineration ash 21 Rotary furnace 22 Input port 23 Discharge port 24 Kiln burner 28 Cooling water spraying Nozzle 39a First temperature detector 39b Second temperature detector 40 Cooling water spray nozzle 41 Smoke channel 42 Cooling tower 46 Secondary combustion chamber burner 49 Waste liquid spray nozzle 100 Control unit

Claims (9)

In a combustion treatment apparatus in which flammable gas generated by heat-treating an object to be treated in a heat-treatment furnace is burned in a secondary combustion furnace connected to the heat-treatment furnace.
A position above the discharge port of the heat treatment furnace that opens toward the secondary combustion chamber and at a position where the combustible gas discharged from the discharge port into the secondary combustion chamber can be combusted laterally. The secondary combustion chamber burner installed on the furnace wall of the secondary combustion chamber and
It is installed on the furnace wall of the secondary combustion chamber above the secondary combustion chamber burner and on the side facing the discharge port, and the cooling water is directed toward the furnace wall above the discharge port of the heat treatment furnace. With a cooling water spray nozzle formed so that it can be sprayed toward
A temperature detector that detects the temperature in the secondary combustion chamber, and is a temperature installed on the furnace wall of the secondary combustion chamber located below the secondary combustion burner and near the upper side of the discharge port. With the detector
A burner output adjusting unit that adjusts the output of the secondary combustion chamber burner,
A cooling water flow rate adjusting unit that adjusts the amount of the cooling water sprayed from the cooling water spray nozzle,
Combustion processing equipment characterized by being equipped with. In the combustion processing apparatus according to claim 1,
A combustion processing apparatus including a control unit that controls the operation of the burner output adjusting unit and the cooling water flow rate adjusting unit so that the secondary combustion chamber is maintained in a predetermined temperature range. In the combustion processing apparatus according to claim 1 or 2.
A waste liquid spray nozzle provided at a position higher than the temperature detector and lower than the secondary combustion burner in the furnace wall of the secondary combustion chamber facing the discharge port is further provided.
The waste liquid spray nozzle includes a waste liquid flow rate adjusting unit that adjusts the amount of waste liquid sprayed from the waste liquid spray nozzle.
A combustion treatment apparatus characterized in that the waste liquid can be heat-treated at the same time as the heat treatment of the object to be treated. In the combustion processing apparatus according to claim 3,
The control unit is a combustion processing device characterized in that the operation of the waste liquid flow rate adjusting unit is further controlled so that the amount of waste liquid sprayed from the waste liquid spray nozzle can be adjusted. In the operation method of the combustion treatment apparatus in which the flammable gas generated by heat-treating the object to be treated in the heat-treatment furnace is burned in the secondary combustion furnace connected to the heat-treatment furnace.
The flammable gas discharged from the discharge port into the secondary combustion chamber is laterally discharged by the secondary combustion chamber burner provided above the discharge port of the heat treatment furnace that opens toward the secondary combustion chamber. Steps to burn from
A step of detecting the temperature in the secondary combustion chamber by a temperature detector installed on the furnace wall of the secondary combustion chamber located below the secondary combustion burner and near the upper side of the discharge port.
Cooling water is supplied to the upper part of the discharge port of the heat treatment furnace by a cooling water spray nozzle installed on the furnace wall of the secondary combustion chamber on the side facing the discharge port and above the secondary combustion chamber burner. The step of cooling the secondary combustion chamber by spraying toward the furnace wall of
Including
Operation of a combustion processing apparatus characterized in that the secondary combustion chamber is maintained in a predetermined temperature range by controlling the output of the secondary combustion chamber burner and the amount of cooling water sprayed from the cooling water spray nozzle. Method. In the operation method of the combustion processing apparatus according to claim 5.
A method for operating a combustion processing apparatus, characterized in that the temperature in the secondary combustion chamber is controlled to be between 800 and 1,200 ° C. and the fluctuation range is within the range of 200 ° C. In the operation method of the combustion processing apparatus according to claim 6,
The output of the secondary combustion chamber burner and the amount of cooling water sprayed from the cooling water spray nozzle are controlled so that the fluctuation range of the temperature in the secondary combustion chamber is within ± 5 ° C. per minute. A method of operating a combustion treatment device, which is characterized in that. In the operation method of the combustion processing apparatus according to any one of claims 5 to 7.
Further, a method of operating a combustion processing apparatus, which comprises controlling the temperature in the secondary combustion chamber by increasing or decreasing the supply amount of the object to be processed. In the operation method of the combustion processing apparatus according to any one of claims 5 to 8.
Further, a waste liquid spray nozzle is arranged at a position higher than the temperature detector and lower than the secondary combustion burner in the furnace wall of the secondary combustion chamber facing the discharge port.
A method for operating a combustion treatment apparatus, which comprises heat-treating the waste liquid by spraying the waste liquid into the secondary combustion chamber from the waste liquid spray nozzle.

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