JP2001090929A - Combustion controller for waste melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong the life of a furnace wall while preventing the operation of a melting furnace, and prevent unburnt components in the furnace and suppress carbon monoxide from being produced by stabilizing furnace temperature in the waste melting furnace composed of a conveyance apparatus for conveying and supplying a stored article R1 to be processed once stored in a storage tank from the storage tank to the melting furnace, and control means for adjusting a melting processing speed of an article R to be processed. SOLUTION: There is provided decision means 31 for comparing a detection level detected by surface level detection means 4 provided on a storage tank 3 with a target range. When it is decided by decision means 31 that the detection means deviates higher from the target range, a melting furnace 6 is kept at an accelerating operation state where a melting processing speed is accelerated for adjustment. When it is decided by the decision means 31 that the detection level deviates lower from the target range, the melting furnace 6 is kept at a decelerating operation state where the melting processing speed is decelerated for adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control apparatus for a waste melting furnace, and more particularly, to a storage tank for temporarily storing an object to be processed, and a melting tank for melting and processing the object once stored in the storage tank. A waste melting furnace, comprising: a furnace; and a transport device for transporting the workpiece from the storage tank to the melting furnace, wherein the melting furnace includes control means for adjusting a melting processing speed of the workpiece. A combustion control device.

[0002]

2. Description of the Related Art Conventionally, in a waste melting furnace, as shown in FIG. 7, a storage tank 3 for temporarily storing an object R, and a melting tank for melting the object R once stored in the storage tank 3. A furnace 6 and a transport device 5 for transporting the object R from the storage tank 3 to the melting furnace 6.
Further, there is provided a combustion control device provided with control means 30 (see FIG. 8) for adjusting the melting processing speed of the object R.
The melting furnace 6 is used for melting and converting slag to reduce the volume of incombustible substances such as incineration ash discharged from a waste incinerator or the like. The material R contained almost no unburned matter such as char mixed into the incinerated ash as a flammable matter, and hardly contained any flammable matter. Therefore, the control means 30 is provided to adjust the amount of the molten material to be processed R in order to achieve the target amount of the molten material set for the melting furnace 6. The main function is to adjust the temperature in the main chamber 8 by adjusting the fuel supply amount to the main chamber 8 of the melting furnace 6 in accordance with the supply amount of the material R.

As the melting furnace 6, for example, there is a surface melting furnace as shown in FIG. In this surface melting furnace,
An inner cylinder 13 is provided around the ceiling 8a of the fixed main room 8.
And a bottomed outer cylinder 14 having a bottom port 15 formed with a slag port 15 a is arranged outside the inner cylinder 13, and the outer cylinder 14 is rotationally driven by a driving mechanism 19. ,
A structure in which the inner cylinder 13 and the outer cylinder 14 are relatively driven to rotate is used.

[0004] A combustion device 10 is arranged in the ceiling portion 8a, and a lower space of the combustion device 10 is filled with fuel supplied from the fuel supply passage 11 to the combustion device 10 by air supplied from the main chamber air supply passage 12a. A space defined by the outer tube 14 and the inner tube 13 is provided in the main chamber 8 for supplying and burning through the combustion device 10 and melting the incombustible material of the object to be processed R by the heat. Is communicated with the main chamber 8 to form an annular supply path 16 through which the object R is supplied from the communicating space to the main chamber 8. In other words, the main purpose is to melt the non-combustible workpiece. The processing object R supplied from the annular supply path 16 is temporarily stored on the bottom plate 15 in the main chamber 8 and formed into an inverted conical shape by the heat of combustion in the main chamber 8. The surface of the treated material is melted to generate molten slag, and the generated molten slag flows down onto the bottom plate 15 and passes from the slag port 15a to the slag collection tank 21 via the secondary chamber 20 also serving as a slag discharge path. It is dropped and collected (see FIG. 7). In order to supply the processing object R into the main chamber 8 from the annular supply path 16, a cutting blade 9 </ b> A is provided as a supply device 9 at a lower end of the inner cylinder 13, and the outer cylinder 14 is rotated. Then, the cutting blade 9A is connected to the annular supply path 1.
6, the object R once stored is rotated relative to the object R once stored, and the object R once stored is cut out toward the surface of the object.

The fuel for heating and melting the object to be processed R in the main chamber 8 is supplied to the fuel supply passage 1 to the combustion device 10.
1 from the fuel control valve 11.
The main chamber air for burning the fuel, which is regulated by a, is supplied from the main chamber air supply passage 12a through the combustion device 10, but in order to promote the volatilization of heavy metals and improve the quality of slag, In order to maintain the atmosphere in the main chamber 8 in a reducing atmosphere, the air is supplied at a preset air ratio (for example, 0.8 to 1.0). The control of the fuel supply amount and the main chamber air amount is performed by the furnace temperature adjusting means 32 of the control means 30.

[0006] An object R such as incineration ash from an incinerator is fed to the storage tank 3, but the amount of incineration ash discharged due to the nature of the waste treated in the incinerator is not necessarily limited. Not constant. As described above, since the control means 30 is not provided with a function of changing the melting processing speed, the melting processing speed in the melting furnace 6 is affected to some extent by the properties of the object R to be processed. However, the speed is almost constant, and as described above, the amount of the object R supplied to the melting furnace 6 is not always constant, and the amount of supply of the object R is relatively large. The storage tank 3 is provided as an absorbing means.

In the actual operation of the waste melting furnace, if the amount of the to-be-processed material stored in the storage tank 3 decreases, an operator intervenes and the amount of the to-be-processed material in the melting furnace 6 decreases. Conversely, if the amount of the stored processing object increases, the operation object intervention increases the processing object supply amount. The amount of the molten material to be processed in the main chamber 8 of the melting furnace 6 is provided by a measuring hopper 18 in a processing object supply mechanism 17 for supplying the processing object R to the annular supply path 16. After weighing the material R, it is determined from the supply to the furnace and the amount of slag recovered in the slag recovery tank 21.

[0008]

By the way, in recent years, melting treatment has been regarded as important for waste treatment, and it has been proposed to treat an object to be treated including solid combustibles such as wastewater treatment sludge. However, when attempting to melt-process such an object to be processed, the supply amount of the object to be processed to the melting furnace is unstable, but as described above, it is preferable that the amount of the melt processing does not fluctuate greatly. . In particular, since starting and stopping the operation lowers the temperature in the main chamber 8, there is a concern that harmful gases such as dioxin are likely to be generated. Therefore, as shown in FIG. 9, the applicant previously provided a storage hopper 3A in front of the processing object supply mechanism 17 to temporarily store sludge as a processing object in the storage hopper 3A. When a measuring device for measuring the weight of the hopper 3A is provided, and the measurement result by the measuring device exceeds the upper reference value, the amount of sludge supplied to the main chamber 8 is increased, and at the same time, the amount of sludge supplied to the main chamber 8 is increased. If the main chamber air supply is also increased and the weight measurement result in the storage hopper 3A is below the lower standard, the sludge supply is reduced and the main chamber air supply is also reduced at the same time as the melting process. A method of controlling a melting furnace for stably operating a melting processing furnace by adjusting the processing capacity of the furnace has been proposed (see Japanese Patent Application Laid-Open No. 11-51350). In the above-mentioned proposal, the above-mentioned operation intervention is performed by the control device. In order to adjust the processing capacity, the furnace rotation speed by the drive mechanism 19 that rotationally drives the outer cylinder 14 and the main chamber air to the main chamber 8 are adjusted. By combining the supply amount, the control level, the normal operation level,
A processing amount UP operation level and a processing amount DOWN operation level are set, and while the measuring device provided in the storage hopper 3A indicates a weighing result exceeding the upper reference value, the processing amount UP operation level is maintained. The processing amount DOWN operation level is maintained while the measuring device provided in the storage hopper 3A indicates a measurement result lower than the lower reference value.

However, according to the above-described method of controlling the melting furnace, it is possible to avoid the suspension of the operation of the melting furnace, but in order to quickly return to the operation at the normal operation level, the normal operation level and the processing amount If the operation amount of switching between the UP operation level and the operation amount of switching between the normal operation level and the processing amount DOWN operation level is increased, the combustion state of combustibles in the sludge changes. The main chamber 8 with a sudden rise and fall in temperature.
However, there is a problem that it is not possible to sufficiently reduce the risk that the molten state in the furnace rapidly changes, causing burnout of the furnace wall, etc., mixing of unburned components into slag, and generating carbon monoxide. I have. Also, in order to stabilize the condition inside the furnace,
The volume of the sludge stored in the furnace is important, and if the amount of the material to be supplied to the furnace is controlled by weight, if the bulk specific gravity of the material changes, the The level of the inner surface of the furnace may change, which may cause the unmelted workpiece to roll down on the main chamber surface of the workpiece and fall into the slag collection tank. In addition, there is a problem that as a result of the surface of the main chamber receding to expose the inner wall of the furnace, the furnace wall may be burned.

[0010] Further, instead of the conventional refuse incineration treatment, a combined treatment for incineration and melting of waste is combined by combining a waste carbonization treatment furnace for carbonizing waste such as municipal waste and a waste melting furnace. Examination of facilities is underway. In such a case, it is considered that the above problem becomes more remarkable.
In particular, when using the control method of the melting furnace,
When the processing amount is switched to the UP operation level, for example, if the processing target does not contain or contains a small amount of combustible material, the processing target material is excessively supplied, and the processing target material is melted. There is a possibility that the object may roll down on the surface of the main chamber of the object to be processed and fall into the slag collection tank without being melted. In actual furnace operation,
This is because the ratio of combustibles in the object is not constant. Further, if the ratio of combustibles in the processing target increases, when switching to the processing amount UP operation level, the temperature in the main chamber rapidly rises due to rapid combustion of the combustibles in the processing target, Burning of the furnace wall and the like is likely to occur. further,
When the rate of combustibles in the processing target is high when the processing amount is switched to the DOWN operation level, even if the supply speed of the processing target to the main chamber is reduced, the combustibles in the processing target are reduced. Since the volume is reduced by burning, the amount of the object to be processed in the furnace may be extremely reduced, and the furnace may be damaged.

Accordingly, the combustion control apparatus for a waste melting furnace according to the present invention solves the above-mentioned problems, stabilizes the furnace temperature while preventing the operation of the melting furnace from being stopped, and extends the life of the furnace walls and the like. It is another object of the present invention to provide means capable of preventing generation of unburned components in a furnace and suppressing generation of carbon monoxide.

[0012]

[Means for Solving the Problems]

[Features] The control apparatus for a waste melting furnace according to the present invention detects the surface level of the storage object stored in the storage tank and maintains the surface level within an allowable range. When the surface level deviates from the permissible range, the melt processing speed is adjusted according to the degree of the deviation, and each characteristic configuration is as follows.

[First characteristic configuration] A first characteristic configuration of the combustion control apparatus for a waste melting furnace according to the present invention for the above purpose is as described in claim 1, wherein the surface of the storage object to be treated is stored in a storage tank. Surface level detection means for detecting a level, and a determination means for comparing the detection level detected by the surface level detection means with a target range defined by a target upper limit level and a target lower limit level; If it is determined that the detection level has deviated upward from the target upper limit level, the operating state of the melting furnace is increased in speed to adjust the melting processing speed of the object to be processed in accordance with the detection level. That is, the control means is configured so as to hold the data.

[Second feature configuration] A second feature configuration of the combustion control apparatus for a waste melting furnace according to the present invention for the above purpose is as described in claim 2, wherein the surface of the storage object in the storage tank is provided. Surface level detection means for detecting a level, and a determination means for comparing the detection level detected by the surface level detection means with a target range defined by a target upper limit level and a target lower limit level; If it is determined that the detection level has deviated downward from the target upper limit level, the operating state of the melting furnace is changed to a deceleration operation state in which the melting processing speed of the object is reduced and adjusted in accordance with the detection level. That is, the control means is configured so as to be held at

[Third characteristic configuration] A third characteristic configuration of the combustion control apparatus for a waste melting furnace according to the present invention for the above purpose is as described in claim 3, wherein the surface of the storage object to be treated is stored in the storage tank. Surface level detection means for detecting a level, and a determination means for comparing the detection level detected by the surface level detection means with a target range defined by a target upper limit level and a target lower limit level; When it is determined that the detection level deviates below the target lower limit level, the control unit controls the operating state of the melting furnace to a standby operating state in which melting processing in the furnace is substantially stopped. It is the point which has comprised.

[Fourth characteristic configuration] A fourth characteristic configuration of the combustion control apparatus for a waste melting furnace according to the present invention for the above purpose is as follows. When the state is held in the standby operation state, the control means is configured to release the holding of the standby operation state when the determination means determines that the detection level falls within the target range. On the point.

[Fifth characteristic configuration] A fifth characteristic configuration of the combustion control apparatus for a waste melting furnace according to the present invention is as described in claim 5, wherein the melting control is performed in any one of the first to fourth characteristic configurations. A furnace configured to form a deposition layer of the workpiece supplied from the transfer device; a main chamber configured to melt and process the workpiece supplied from the deposition section; and a main chamber configured to melt the workpiece from the deposition section. What is claimed is: 1. A surface melting furnace comprising: a supply unit for supplying a processing object; and a combustion device for maintaining a high temperature in the main chamber, wherein a calorific value of combustion in the main chamber by the combustion device and the deposition unit by the supply unit are provided. The control means is configured to adjust at least one of the amount of the object to be supplied to the main chamber and the melt processing speed of the object to be processed.

[Effects of each characteristic configuration] According to each of the above-mentioned characteristic configurations, it is possible to stabilize the furnace temperature and suppress the generation of carbon monoxide and unburned slag while stably treating the object to be processed. The operation and effect unique to each characteristic configuration are as follows.

[Function and Effect of the First Characteristic Configuration] According to the first characteristic configuration, excessive storage in the storage tank is suppressed without unnecessarily increasing the size of the storage tank. While preventing the adverse effects on other facilities, such as stopping the supply of materials, stabilizing the furnace temperature, maintaining a stable furnace state, and increasing the supply amount of the processing object to the storage tank. Further, it is possible to suppress the generation of carbon monoxide and unburned slag while stabilizing the object by increasing the amount of the object to be processed in the melting furnace.

That is, when the detection level of the object to be processed in the storage tank detected by the surface level detection means exceeds the target upper limit level, this is determined by the determination means, and the level is increased in accordance with the detection level. By setting the degree of speed-up adjustment to the melting processing speed of the workpiece in the high-speed operation state, it is possible to prevent the surface level of the workpiece from largely deviating from the target upper limit level.
In addition, since the supply amount of the object to be treated into the furnace is controlled by the bulk of the object to be treated, a stable furnace state can be maintained without causing a sudden change in the furnace temperature. Therefore, since the abnormality of the combustion state in the furnace can be prevented, the generation of carbon monoxide can be suppressed. For example, when the deviation of the detection level from the target upper limit level is small, the operation amount by the control means can be reduced, so that a sudden change in the furnace state can be avoided. In addition, when the deviation is large, the period for maintaining the speed-up operation state can be shortened by increasing the operation amount. As a result, the surface level of the storage object in the storage tank can be prevented from largely deviating from the target upper limit level, and the storage tank does not need to be made unnecessarily large.

According to the second feature configuration, the shortage of storage in the storage tank is prevented and the excess storage in the storage tank is suppressed while avoiding the repetition of the shutdown of the melting furnace. it can. In addition, by stabilizing the furnace temperature and maintaining a stable furnace state, the amount of the processing target in the melting furnace is reduced in accordance with the reduction in the supply amount of the processing target to the storage tank. Thus, it is possible to suppress the generation of carbon monoxide and unburned slag while stably treating the object.

That is, when the detection level of the object to be processed in the storage tank detected by the surface level detection means falls below the target lower limit level, this is determined by the determination means, and deceleration is performed in accordance with the detection level. If the degree of deceleration adjustment with respect to the melting processing speed of the workpiece in the operating state is set, the surface level of the workpiece greatly deviates from the target lower limit level, and the workpiece supplied to the melting furnace is insufficient. Can be prevented. Therefore, it is not necessary to increase the target lower limit level more than necessary, so that the amount of the stored workpiece that can be melted can be increased. Therefore, the margin of the storage object can be reduced, so that the storage tank does not need to be made unnecessarily large. In addition, since the supply amount of the object to be treated into the furnace is controlled by the bulk of the object to be treated, a stable furnace state can be maintained without causing a sudden change in the furnace temperature. Therefore, since the abnormality of the combustion state in the furnace can be prevented, the generation of carbon monoxide can be suppressed. For example, when the deviation of the detection level from the target lower limit level is small, the amount of operation by the control means can be reduced, so that a sudden change in the furnace state can be avoided. Further, when the deviation is large, the period for maintaining the deceleration operation state can be shortened by increasing the operation amount.

[Effects of the third characteristic configuration] According to the third characteristic configuration, it is possible to prevent shortage of storage in the storage tank and to suppress excessive storage in the storage tank while avoiding shutting down the operation of the melting furnace. Further, when it is determined that the detection level has deviated downward from the target lower limit level while stabilizing the furnace temperature and maintaining a stable furnace state, the operating state of the melting furnace is changed to the furnace state. By allowing the melting process to be restarted, while maintaining the standby operation state in which the melting process is substantially stopped, the object to be stored in the storage layer does not further decrease, so that the melting speed is excessively increased. The carbon monoxide and the unburned slag can be suppressed from being generated without lowering while stably treating the object.

That is, when the detection level of the object to be processed in the storage tank detected by the surface level detection means falls below the target lower limit level, the temperature in the main chamber is lowered, and at the same time, the processing in the main chamber is performed. By almost stopping the supply of the object and maintaining the standby operation state, the surface level of the object to be processed is further reduced from the target lower limit level,
It is possible to prevent a shortage of the workpiece to be supplied to the melting furnace. Therefore, even if the target lower limit level is set low, the amount of the stored workpiece that can be melted can be increased.
Therefore, the margin of the storage object can be reduced, so that the storage tank does not need to be made unnecessarily large. Moreover, since the supply of the object to be processed into the furnace is almost stopped, and the temperature in the furnace is reduced to a level at which the melting of the object to be processed is almost stopped, no abnormal combustion occurs.
A stable furnace state can be maintained. Therefore, since the abnormality of the combustion state in the furnace can be prevented, the generation of carbon monoxide can be suppressed. For example, if the detection level returns to or above the target lower limit level, if the furnace temperature is slightly increased and the supply of the workpiece is resumed, the melting process of the workpiece is avoided while avoiding a sudden change in the furnace state. Can be resumed. It should be noted that a lower limit level is provided above the target lower limit level, and when there is a detection level between the lower limit level and the target lower limit level, the same processing as in the deceleration operation state in the second characteristic configuration is performed. It is even better.

[Function and Effect of the Fourth Feature] According to the fourth feature, while the function and effect of the third feature are exerted, the melting process of the object to be processed is temporarily stopped, whereby When the balance between the supply amount of the processing object and the melting processing capacity is restored, the melting furnace can be automatically restored to a normal operation state without manual intervention. As a result, the generation of carbon monoxide can be suppressed while the object to be processed can be stably processed without increasing the transient state change.

[Function and Effect of Fifth Feature Configuration] According to the fifth feature configuration, in any of the first to fourth feature configurations, the furnace temperature and the supply of combustibles in the object to be processed are provided. Since the object suitable for adjusting the melting processing speed can be selected and adjusted from any of the speeds, the operation and effect of any of the first to fourth characteristic configurations can be further ensured. Therefore, the emission of carbon monoxide and unburned slag can be reliably suppressed while performing the stabilization treatment of the object to be treated.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the combustion control apparatus for a waste melting furnace according to the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a configuration of a waste treatment facility according to the present invention, FIG. 2 is an explanatory view of a configuration of a surface melting furnace which is an example of a melting furnace according to the present invention, and FIG. 3 is a combustion control according to the present invention. FIG. 4 is a diagram illustrating an example of an apparatus, FIG. 4 is a diagram illustrating a concept of control of a fusion processing amount, FIG. 5 is a diagram illustrating an example of a control state in a fusion process, and FIG. It is a diagram explaining another example of the control state in the melting process. Elements that are the same as those described in the related art and have the same functions are denoted by the same reference numerals as in FIGS. 7 to 9, and a part of the detailed description is omitted.

As shown in FIG. 1, the waste melting furnace is a storage tank 3 for storing a to-be-processed substance R, which is a carbonized residue obtained by carbonizing waste in a waste carbonization furnace (hereinafter simply referred to as a carbonization furnace 1). Then, the object R to be treated is transported and supplied from the storage tank 3 to the melting furnace 6 by the transport device 5 to melt the object R once stored in the storage tank 3. The waste supplied to the carbonization furnace 1 is previously dried in a drying furnace (not shown). The carbonization furnace 1 is of a rotary kiln type in which heating is performed from the outside of the rotary drum, and the waste after drying is put into the carbonization furnace 1 and subjected to pyrolysis in the furnace to form carbonization gas and carbonization residue. Split. The carbonization residue is separated from the carbonization gas in the discharge section 1a of the carbonization furnace 1 and sent to the storage tank 3 by the feed conveyor 2 as the processing object R. The workpiece R temporarily stored in the storage tank 3 is transported from the storage tank 3 to the workpiece supply mechanism 17 of the melting furnace 6 by the transport device 5, and the workpiece supply mechanism At 17, the weight of the object R to be charged into the melting furnace 6 is charged into a weighing hopper 18 capable of measuring the weight (see FIG. 3). The object to be processed R that has been put into the melting furnace 6 from the weighing hopper 18 is supplied to a supply unit 9.
Is supplied into the furnace and burnt, and the combustion residue is melted. The molten combustion residue is recovered in the slag recovery tank 21 as molten slag. On the other hand, the combustion gas generated in the furnace is introduced into the secondary combustion chamber 23 through the exhaust gas passage 22, and is supplied with secondary air to be completely burned. The exhaust gas after complete combustion is cooled by preheating air to the air supply passage 12 to be supplied to the main chamber 8 by an air preheater 25 provided in an exhaust passage 24,
The dust is removed by a dust removing device 26, rendered harmless by an exhaust gas treatment device 27, and sent out to the atmosphere via a chimney 29 by an induction blower 28. In addition, in order to deodorize and deodorize the dry gas obtained by drying the waste in the drying furnace, a discharge path (not shown) for the dry gas is used to introduce the dry gas into the secondary combustion chamber 23. Connect to.

As shown in FIG. 2, the melting furnace 6 comprises a surface melting furnace 6A, and an inner cylinder 13 is erected around a ceiling portion 8a of a fixed main chamber 8 and extends to a bottom plate 15. A bottomed outer cylinder 14 having a slag opening 15a is arranged outside the inner cylinder 13 and supplied from the transfer device 5 to an annular space between the inner cylinder 13 and the outer cylinder 14. The main chamber 8 is formed by forming a deposition section 7 on which a deposition layer of the processing object R is formed, and capable of melting and processing the processing object R supplied from the deposition section 7.
Is formed between the ceiling 8a and the bottom plate 15. The annular space is formed in the annular supply path 16 that supplies the processing object R from the deposition unit 7 to the main chamber 8, and a cutting blade 9 </ b> A is provided at a lower end of the inner cylinder 13. It is a supply unit 9 that supplies the object R from the deposition unit 7 to the main chamber 8. The outer cylinder 14 is driven to rotate by a drive mechanism 19, so that the inner cylinder 13 and the outer cylinder 14 are driven to rotate relatively. With this configuration, the rotation of the outer cylinder 14 causes the cutting blade 9 </ b> A to rotate relative to the stacking unit 7, and cuts the workpiece R from the stacking unit 7 into the furnace.

A burner 10B constituting the combustion device 10 is disposed on the ceiling portion 8a. The burner 10B burns a fuel supply path 11 and fuel supplied from the fuel supply path 11 based on a predetermined air ratio. The burner air supply path 12b is connected. The fuel supply amount to the burner 10B is determined by detecting the furnace temperature in the main chamber 8 by the furnace temperature detecting means 35 (see FIG. 3) disposed on the ceiling 8a, and setting the furnace temperature to a target. The temperature is adjusted by the furnace temperature adjusting means 32 so as to maintain the target temperature set between the lower limit temperature and the target upper limit temperature. The amount of air from the burner air supply passage 12b is determined by a preset air ratio (for example, 0.8 to 1.
0) is proportionally controlled with respect to the fuel supply amount. The burner 10B maintains the temperature in the main chamber 8 at a target furnace temperature by the heat of the fuel when the combustible material is not contained in the treatment object R. When combustibles are present, the temperature in the main chamber 8 is maintained within a target furnace temperature range by compensating for the lack of combustion heat of the combustibles. A main chamber air nozzle 10A for supplying main chamber air for burning combustibles in the object to be processed R into the main chamber 8 is provided at a position below the inner cylinder 13 of the ceiling portion 8a. It is arranged upstream of the burner air supply passage 12b and is connected to a main room air supply passage 12a branched from the air supply passage 12.

As shown in FIG. 3, the transfer device 5 is configured to cut out a processing object R1 cut out from the bottom of the storage tank 3 and a processing object R cut out by the cutting conveyor 5a. A flight conveyer 5b which receives the trough and sends it out to the weighing hopper 18 by a paddle in the trough. The weighing hopper 18 is provided with a double damper mechanism between the weighing hopper 18 and the lower annular supply path 16, and a first gate damper 18a is disposed above and a second gate damper 18b is disposed below. With the first gate damper 18a closed, the workpiece R is put into the weighing hopper 18 from the flight conveyor 5b. In the weighing hopper 18, a predetermined time (1 minute to 2 minutes) is set.
Minutes), the weighing of the object to be processed R that has been input is started.
Note that irrespective of the elapse of this time, weighing is started when the amount of the object to be processed R exceeds a certain amount (for example, 3 kg). Simultaneously with the start of the weighing, the flight conveyor 5b
Stops. When the weighing is completed, the first gate damper 18a is opened after the second gate damper 18b is closed, and the weighed workpiece R is removed from the first gate damper 1b.
8a and the second gate damper 18b.
Next, the first gate damper 18a is closed, the second gate damper 18b is opened, and the weighed workpiece R
Into the melting furnace 6. When the loading of the object to be processed R is completed, the flight conveyor 5b is restarted again.

With the above configuration, when only the carbonization residue from the carbonization furnace 1 is melted as the object to be processed, the burner 10B functions as a start-up burner when the furnace 6 is started up. Besides the main room 8
It functions as an auxiliary burner for compensating the temperature change in the inside. The ceiling portion 8a has a furnace surface detecting means 3 for detecting the furnace level of the surface of the workpiece in the main chamber 8.
6, a melting speed adjusting means 33 for adjusting the rotational driving speed of the driving mechanism 19 so as to keep the level of the furnace inner surface detected by the furnace inner surface detecting means 36 within a predetermined range. Further, the furnace temperature control means 32 stoichiometrically calculates and derives the stoichiometric amount of theoretical oxygen in the main chamber 8 from the component composition of the combustion gas from the main chamber 8 detected in the exhaust gas passage 22. The main chamber air supply amount in the main chamber air supply passage 12a is set from the calculation result. For this purpose, a combustion gas component detecting means 34 is disposed in the exhaust gas path 22. The combustion gas component detection means 34 is configured to detect, for example, the oxygen concentration and the carbon monoxide concentration in the combustion gas.

As described above, the storage tank 3 is provided to buffer a mismatch between the dry distillation speed of the dry distillation furnace 1 and the melting speed of the melting furnace 6. The storage tank 3
As shown in FIG. 3, the discharge side of the feed conveyor 2 is connected to the top so as to receive the carbonized residue from the carbonization furnace 1 as an object to be processed R, and the cut-out conveyor provided at the bottom. Numeral 5a is constituted by a screw conveyor, and the stored objects to be treated R1 in the tank are sequentially cut out of the tank. In addition, the storage object R1 in the tank
Is too large to exceed the processing capacity of the melting furnace 6, and that the amount of the storage object R1 is too small to stop the melting furnace 6 normally. For this purpose, a target range defined by a target upper limit level Lut and a target lower limit level Llt is set with respect to the surface level of the storage target R1, and the storage target R1 is set.
A surface level detecting means 4 for detecting the surface level of the above. The surface level detecting means 4 includes the storage tank 3
A distance sensor for detecting the distance from the ceiling to the surface of the storage object R1 downward is preferably used, and the surface level can be detected at an arbitrary height. As this distance sensor, a capacitance type sensor, an ultrasonic type sensor or the like can be used. Further, a determining means 31 for confirming that the surface level is within the target range is provided.

Further, the determination means 31 compares the detection level detected by the surface level detection means 4 with the target upper limit level Lut to determine the target upper limit level Lut.
ut, and the detection level detected by the surface level detection means 4 is compared with the target lower limit level Llt to calculate the lower deviation from the target lower limit level Llt. To do it. Further, a maximum limit is set for the downward deviation, and a minimum level is set. It should be noted that a maximum limit is also provided for the deviation upward from the target upper limit level Lut, for example, the storage upper limit Lmx of the storage tank 3.
The upper limit level Lul may be set at a lower position.

The combustion control device of the waste melting furnace comprises: a combustion heat generation amount in the main chamber 8 by the combustion device 10;
A control means 30 is provided for adjusting at least one of the supply amount of the processing object R to the processing object R and the melting processing speed of the processing object R.
2, the melting speed adjusting means 33, and the surface level detecting means 4 and the judging means 31 are included. That is,
The in-furnace temperature adjusting means 32 functions so as to adjust the combustion heat value based on the set target in-furnace temperature, and the melting rate adjusting means 33 controls the supply means 9 so that the main chamber is controlled. 8 functions to regulate the supply amount of the object to be processed. This can be set, for example, as shown in FIG. The target lower limit level Llt
And the target upper limit level Lut as a target range,
Within this target range, the control means 30
Based on the process data, the furnace temperature adjusting means 32 and the melting rate adjusting means 33 adjust the furnace temperature in the main chamber 8 using a preset control index, and A normal operation for adjusting the supply amount of the processing object R is performed. Here, when the detection level deviates from the target range, the following measures are taken.

When the supply of the processing object R to the storage tank 3 by the feed conveyor 2 becomes excessive and the detection level exceeds the target upper limit level Lut, the melting speed adjusting means 33 based on the detection level. In place of the target rotation speed in normal operation between the target lower limit rotation speed Vlt and the target upper limit rotation speed Vut, the rotation speed of the drive mechanism 19 is set higher than the target upper limit rotation speed Vut. Move to operation. However, if the temperature reaches the upper limit rotation speed Vu corresponding to the maximum rotation speed of the outer cylinder 14 capable of stably controlling the melting furnace 6, no further increase in speed is performed. When the detection level reaches the storage upper limit Lmx, which is the storage limit of the storage tank 3, the feed conveyor 2 is stopped.
Note that the feed conveyor 2 is restarted when the detection level becomes lower than the storage upper limit Lmx. If the detection level returns to the target upper limit level or less during the speed-up operation, the setting in the speed-up operation is canceled and the operation returns to the normal operation in the target range.

On the other hand, if the supply of the object R to the storage tank 3 by the feed conveyor 2 is insufficient and the detection level falls below the target lower limit level Llt, the target rotation speed is reduced based on the detection level. Alternative drive mechanism 19
The operation shifts to the deceleration operation in which the target rotation speed is set. During the deceleration operation, if the detection level further decreases and reaches the lower limit level Lll, which is the storage lower limit of the storage tank 3,
The setting of the target rotation speed in the deceleration operation is released, and instead of the target temperature set in the furnace temperature adjusting means 32, the standby temperature Ts slightly lower than the furnace temperature at which the melting of the furnace inner surface can be maintained. Is set in the furnace temperature adjusting means 32, and the control state is shifted to the standby operation. Note that the setting of the standby temperature Ts is such that the detection level is equal to the lower limit level L.
Release when it returns to ll or more. If the detection level returns to the target lower limit level Llt or more during the deceleration operation, the setting in the deceleration operation is released and the operation returns to the normal operation in the target range.

As described above, the control means 30
Abnormal combustion of the object to be treated and auxiliary fuel in the furnace is prevented, and the emission of carbon monoxide to the outside of the system is prevented. The function of the control means 30 will be described in detail below.

If the surface level detecting means 4 detects the stored object to be processed R1 and the determining means 31 determines that the detected level has deviated upward from the target upper limit level, it corresponds to the detected level. Then, the operating state of the melting furnace 6 is maintained in a speed-up operating state in which the speed of the melting process of the processing target R is adjusted. That is, the control means 30 increases the speed of the drive mechanism 19 within a range up to a preset maximum rotation speed of the drive mechanism 19 based on a condition preset for the detection level. Then, the operation shifts to the speed-up operation in which the proportional control is performed. If the speed of the drive mechanism 19 is increased in this manner, the cutting blade 9A
However, the relative rotation speed with respect to the processing object R once stored in the annular supply path 16 increases, and the supply amount of the processing object R toward the surface of the processing object increases. Here, the setting of the target temperature by the furnace temperature adjusting means 32 is adjusted to maintain the level of the furnace inner surface.
In this way, the amount of the molten object R to be processed in the melting furnace 6 is increased, and excessive storage in the storage tank 3 is avoided.

If the surface level detecting means 4 stops detecting the stored object to be processed R1 and the determining means 31 determines that the detected level has deviated from the target upper limit level, the detection is performed. According to the level, the operating state of the melting furnace 6 is maintained in a deceleration operation state in which the melting processing speed of the processing target R is adjusted to be reduced. That is, the control means 30 shifts to a deceleration operation in which the drive mechanism 19 is proportionally controlled to be decelerated based on a condition set in advance for the detection level. When the drive mechanism 19 is decelerated in this manner, the cutting blade 9
The rotation speed of A relative to the processing target R once stored in the annular supply path 16 is reduced, and the supply amount of the processing target R toward the surface of the processing target decreases.
Here, the setting of the target temperature by the furnace temperature adjusting means 32 is adjusted to maintain the level of the furnace inner surface. In this way, the amount of the melted object R to be processed in the melting furnace 6 is reduced, the shortage of the storage amount in the storage tank 3 is avoided, and the shutdown of the melting furnace 6 is avoided.

Here, the determination unit 31 determines that the supply amount of the object to be processed from the dry distillation furnace 1 is reduced, the detection level is further reduced, and the preset lower limit level is reached. In this case, the operation state of the melting furnace 6 is maintained in a standby operation state in which the melting process in the furnace is substantially stopped. That is, the drive mechanism 19 is further decelerated, and the target furnace temperature set in the furnace temperature adjusting means 32 is set to a preset standby temperature. In this way, if the melting of the inner surface of the furnace of the object R is almost stopped by setting the standby temperature, the driving mechanism 19 is almost stopped by the melting speed adjusting means 33. When the operation state in the furnace is maintained in the standby operation state, if the determination unit 31 determines that the detection level falls within the target range, the standby operation state is released. . this is,
This is performed by returning the target furnace temperature to a preset set temperature. In this way, when the target furnace temperature is restored, the furnace inner surface resumes melting and starts retreating sequentially. Therefore, the rotational drive by the drive mechanism 19 is gradually returned by the melting speed adjusting means 33. You do it.

An example of a control operation for the change in the detection level accompanying the intervention control by the control means 30 and a specific time course of the target temperature in the furnace temperature control means 32 and the target rotation speed in the melting speed control means 33 Will be described below.

For example, as shown in FIG. 5, when the detection level falls below the target lower limit level Llt, the melting speed adjusting means 33 sets the driving mechanism 19 in accordance with the detection level. The target rotation speed is set lower than the target lower limit rotation speed Vlt, and the control state is switched to the deceleration operation. In this deceleration operation, the target rotation speed is set lower as the detection level is lower. In conjunction with this, the supply interval of the processing object R from the weighing hopper 18 to the annular supply path 16 is expanded, and at the same time, the storage processing object R1 by the cutting-out conveyor 5a is increased.
Is also reduced. If the supply amount of the processing object R from the feed conveyor 2 does not significantly decrease, as shown by a broken line in the figure, the detection level does not become lower than the lower limit level Lll and the detection level falls within the target range. When the supply amount is significantly reduced, the detection level may be reduced to the lower limit level Lll as shown by a solid line in the figure. In this case, the flight conveyor 5b and the cutting conveyor 5
is stopped, and the target temperature of the in-furnace temperature adjusting means 32 (at this point, the temperature has dropped to the target lower limit temperature Tlt with a decrease in the supply amount of the processing object R). Switching to the standby temperature Ts and switching the control state to the standby operation (at this time, the target rotation speed in the melting speed adjusting means 33 is a lower limit corresponding to the minimum rotation speed of the outer cylinder 14 capable of stably controlling the melting furnace 6). The rotation speed may have reached Vl.). When the control state is switched to the standby operation, the furnace inner surface of the deposition unit 7 in the main chamber 8 does not melt, and the level of the furnace inner surface does not change. The target rotational speed set in the step becomes almost zero, and the outer cylinder 14 of the melting furnace 6 almost stops. In this state, since the stored object R1 in the storage tank 3 does not decrease, the detection level gradually increases and returns to the target lower limit level Llt. When the detection level becomes equal to or higher than the target lower limit level Llt, the setting of the standby operation is released.

Next, as shown in FIG. 6, when the detection level exceeds the target upper limit level Lut, the melting speed adjusting means 33 sets the driving mechanism 19 in accordance with the detection level. The target rotation speed is set higher than the normal operation range, and the control state is switched to the speed-up operation. In this speed-up operation, the target rotation speed is set higher as the detection level is higher. In conjunction with this, the supply interval of the processing object R from the weighing hopper 18 to the annular supply path 16 is reduced, and at the same time, the cutting speed of the stored processing object R1 by the cutting conveyor 5a increases. Speeded up. The object to be processed R from the feed conveyor 2
If the supply amount is not particularly large, as shown by a broken line in the figure, the detection level is equal to the upper limit level Lul.
Without returning above, it returns to the target range, but when the supply amount is remarkably increased, as shown by a solid line in the figure, the detection level reaches the upper limit level Lul. May rise. In this case, the feed conveyor 2 is stopped, and the target temperature of the in-furnace temperature adjusting means 32 (at this point, the target upper limit temperature Tut is raised to the target upper limit temperature Tut with an increase in the supply amount of the processing object R). Is maintained at the target upper limit temperature Tut. here,
The target rotation speed (the target rotation speed has reached the target upper limit rotation temperature Vut at this time) in the melting speed adjusting means 33 is maintained at the target upper limit rotation temperature Vut, and the melting processing speed of the melting furnace 6 is increased. Keep to the maximum. In this state, since the processing object R is not supplied to the storage tank 3, the storage processing object R1 gradually decreases, the detection level gradually decreases, and the target upper limit level L
Return to ut. When the detection level falls below the target upper limit level Lut, the setting of the speed-up operation is canceled.

[Other Embodiments] Embodiments of the present invention other than those described in the above embodiment will be described below.

<1> In the above embodiment, an example in which the dry distillation furnace is of a rotary kiln type has been described. However, the dry distillation furnace may be a shaft furnace type pyrolysis furnace. An autoclave for extracting an oil component from a resin may be used, or a fluidized bed furnace may be used, and any type may be used as long as it discharges dry distillation residues.

<2> In the above-described embodiment, an example has been described in which the material to be supplied to the waste melting furnace is a carbonization residue from a carbonization furnace, but the material to be processed is only the carbonization residue. Instead, it may be incineration ash discharged from a waste incinerator or the like, sludge from water treatment, or a mixture of any or all of these.

<3> In the above-described embodiment, an example in which the dry distillation residue is fed into the storage tank 3 by the feed conveyor 2 has been described. However, the dry distillation residue is stored in a container such as a container, transported, and stored. It is also possible to charge the tank 3 intermittently.

<4> In the above embodiment, an example was described in which the melting furnace was constituted by a surface melting furnace. However, the melting furnace may be of another type. Or a rotating melting furnace in which the object to be processed is charged into a swirling high-temperature airflow and melted. In short, what is necessary is just a melting processing furnace provided with a storage tank for temporarily storing an object to be supplied to the melting furnace.

<5> In the above-described embodiment, the transfer device 5 is a cutting conveyor 5 a configured by a screw conveyor that cuts out the storage object R 1 from the bottom of the storage tank 3.
And a flight conveyor 5 which receives the workpiece R cut by the cutting conveyor 5a into a trough and sends it out to the weighing hopper 18 in the trough by a paddle.
b, the transport device 5
Is arbitrary, for example, the flight conveyor 5
In place of b, a belt conveyor, a pivot conveyor or the like may be arranged, and the cut-out conveyor 5a may be of another type. For example, instead of the cut-out conveyor 5a, the storage object R1 may be cut out by a rotary valve provided at the bottom of the storage tank 3, the storage tank 3 may be formed in a hopper shape, and a double damper may be provided at the bottom. A mechanism may be provided so that the storage object R1 at the bottom of the storage tank 3 is taken out by opening and closing the mechanism. Further, the storage object R1 may be cut out by the single transfer device 5 and supplied to the melting furnace as it is, without dividing the transfer device 5 into two as described in the above embodiment.

<6> In the above embodiment, the surface level detecting means 4 for detecting the surface level of the storage object R1 in the storage tank 3 is provided, and the detection level detected by the surface level detecting means 4 is detected. Determining means 31 for comparing with a target range defined by a target upper limit level Lut and a target lower limit level Llt, and when the detection level deviates from the target range, the detection level decreases the target upper limit level Lut. If it exceeds, the operation shifts to speed-up operation, and if the detection level falls below the target lower limit level Llt, the target rotation speed of the drive mechanism 19 is set lower than the normal operation range based on the detection level based on the detection level. When the detection level reaches the lower limit level Lll during the deceleration operation, an example in which the operation shifts to the standby operation has been described. When determined that the detected level deviates downward from the target lower level LLT, the operating state of the melting furnace 6, without shifting the deceleration operation,
It may be configured to directly shift to the standby operation. In this way, there is no need to set the target lower limit level Llt low as a margin for avoiding the shutdown of the melting furnace 6, and the storage space of the storage tank 3 can be used effectively. .

<7> In the above embodiment, the surface level detecting means 4 for detecting the surface level of the storage object R1 in the storage tank 3 is provided, and the detection level detected by the surface level detecting means 4 is detected. Determining means 31 for comparing with a target range defined by a target upper limit level Lut and a target lower limit level Llt, and when the detection level deviates from the target range, the detection level decreases the target upper limit level Lut. If it exceeds, the operation shifts to speed-up operation, and if the detection level falls below the target lower limit level Llt, the target rotation speed of the drive mechanism 19 is set lower than the normal operation range based on the detection level based on the detection level. When the detection level reaches the lower limit level Lll during the deceleration operation, an example in which the operation shifts to the standby operation has been described. If it is determined that the detection level has deviated upward from the target upper limit level, the operation state of the melting furnace 6 is shifted to a speed-up operation, and if the detection level returns to the target upper limit level or less, the operation is normal. It may be only possible to shift to operation.

<8> Instead of the above <7>, when the judging means 31 judges that the detection level has deviated below the target upper limit level, the melting furnace 6
May be shifted to deceleration operation, and may be shifted to normal operation only when the detection level returns to the target lower limit level Llt or higher.

<9> In addition to the above <8>, if the detection level reaches the lower limit level Lll during the deceleration operation, the setting of the target rotation speed in the deceleration operation is canceled,
The control state may be shifted to the standby operation.

<10> In the above embodiment, an example was described in which a level sensor using a non-contact distance sensor was used as the surface level detecting means 4. However, the form of the surface level detecting means 4 is not particularly limited. There is no limitation, and one or a plurality of contact-type surface sensors may be provided as a level sensor, and this may be a distance sensor. These sensors can be arranged at any locations such as the ceiling, bottom, and side walls of the storage tank 3. Further, a contact type surface sensor and a non-contact type distance sensor may be shared as a level sensor.

<11> In the above embodiment, when the detection level exceeds the target upper limit level Lut, the operation shifts to a speed-up operation in which the rotation speed of the drive mechanism 19 is set based on the detection level. When the detection level falls below the target lower limit level Llt, as an example of shifting to a deceleration operation in which the target rotation speed of the drive mechanism 19 is set lower than the normal operation range based on the detection level, the drive mechanism 1
FIG. 4 shows an example of proportionally controlling the rotation speed 9 with respect to the detection level, and FIGS. 5 and 6 show examples of nonlinearly controlling the rotation speed. However, these are not contradictory to each other. Due to the influence of the furnace temperature, the target rotation speed may be set nonlinearly for linear control, or even if the target rotation speed is set in proportion to the detection level, nonlinear control may be performed. is there. In short, the operation amount is increased / decreased in the same direction as the upper and lower sides of the detection level, and it does not matter whether or not the proportional control is performed. Further, stepwise control may be performed in which a section having a width in the detection level is set, and the operation amount is set stepwise for each section.

<12> In the above embodiment, the cutting blade 9A is provided at the lower end of the inner cylinder 13 of the surface melting furnace 6A exemplified as the melting furnace 6, and the processing object is transferred from the deposition section 7 to the main chamber 8. Although an example has been described as the supply unit 9 for supplying R, when the surface melting furnace 6 </ b> A is used as the melting furnace 6, the supply unit 9 only needs to be arranged in the deposition unit 7, and a pusher mechanism And may be provided with another extrusion supply mechanism such as a flight screw.

<13> In the above embodiment, FIG.
In the deceleration operation state shown in FIG. 6 and the speed-up operation state shown in FIG. 6, an example in which the target temperature is changed is shown.
This shows an example in which the function of the in-furnace temperature adjusting means 32 indirectly changes according to the in-furnace temperature, and the setting of the target temperature need not be changed except in the standby operation state. However, if the furnace temperature can be adjusted without any trouble, the target temperature may be changed and set together with the target rotation speed. In the above, the target rotation speed is shown as an adjustment index of the melting processing speed. However, in the technical idea of the present invention, the target rotation speed corresponds to the supply speed of the supply means 9 for supplying the processing target to the melting region. Is what you do.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the configuration of a waste treatment facility according to the present invention.

FIG. 2 is a structural explanatory view of a surface melting furnace which is an example of the melting furnace shown in FIG.

FIG. 3 is a configuration explanatory view of an example of a combustion control device according to the present invention.

FIG. 4 is a diagram showing the concept of controlling the amount of fusion processing according to the present invention.

FIG. 5 is a diagram illustrating an example of a control state in a melting process;

FIG. 6 is a diagram illustrating another example of the control state in the melting process.

FIG. 7 is a configuration explanatory view of an example of a conventional waste treatment facility.

FIG. 8 is an explanatory view of a configuration of an example of the melting furnace shown in FIG. 7;

FIG. 9 is a configuration explanatory diagram illustrating an example of a conventional combustion control.

[Explanation of symbols]

 Reference Signs List 4 storage tank 5 surface level detecting means 6 transfer device 7 melting furnace 7A surface melting furnace 8 stacking section 9 main chamber 10 supply means 11 combustion device 30 control means 31 determination means R object to be processed R1 storage object to be processed

Continued on the front page F term (reference) 3K062 AA07 AA16 AB03 AC01 CB01 DA00 DA07 DB01 DB13 4D004 AA46 CA24 CA29 CA48 CB42 CB45 DA01 DA02 DA12 DA20

Claims (5)

[Claims] 1. A storage tank (3) for temporarily storing an object to be processed (R), a melting furnace (6) for melting and processing the object to be processed (R) once stored in the storage tank (3), A conveying device (5) for conveying and supplying the object (R) from the storage tank (3) to the melting furnace (6); and melting the object (R) in the melting furnace (6). A combustion control apparatus for a waste melting furnace provided with a control means (30) for adjusting a processing speed, wherein a surface level detection means (R1) for detecting a surface level of a storage object (R1) in the storage tank (3). 4), and determining means (31) for comparing the detection level detected by the surface level detecting means (4) with a target range defined by a target upper limit level and a target lower limit level is provided. 31) when the detection level is higher than the target upper limit level If it is determined that emerged was the,
The control means (30) is controlled so as to maintain the operating state of the melting furnace (6) in a speed-up operating state in which the melting processing speed of the object to be processed (R) is increased in accordance with the detection level. Combustion control device for the configured waste melting furnace. 2. A storage tank (3) for temporarily storing the object (R), a melting furnace (6) for melting the object (R) once stored in the storage tank (3), and A conveying device (5) for conveying and supplying the object (R) from the storage tank (3) to the melting furnace (6); and melting the object (R) in the melting furnace (6). A combustion control apparatus for a waste melting furnace provided with a control means (30) for adjusting a processing speed, wherein a surface level detection means (R1) for detecting a surface level of a storage object (R1) in the storage tank (3). 4), and determining means (31) for comparing the detection level detected by the surface level detecting means (4) with a target range defined by a target upper limit level and a target lower limit level is provided. In 31), the detection level falls below the target upper limit level. If it is determined that emerged was the,
The control means (30) is configured to maintain an operation state of the melting furnace (6) in a deceleration operation state in which a melting processing speed of the object (R) is reduced and adjusted according to the detection level. Control system for a waste melting furnace. 3. A storage tank (3) for temporarily storing the object (R), a melting furnace (6) for melting and processing the object (R) once stored in the storage tank (3), A conveying device (5) for conveying and supplying the object (R) from the storage tank (3) to the melting furnace (6); and melting the object (R) in the melting furnace (6). A combustion control apparatus for a waste melting furnace provided with a control means (30) for adjusting a processing speed, wherein a surface level detection means (R1) for detecting a surface level of a storage object (R1) in the storage tank (3). 4), and determining means (31) for comparing the detection level detected by the surface level detecting means (4) with a target range defined by a target upper limit level and a target lower limit level is provided. At 31), the detection level deviates downward from the lowest level. When the determination is made, the control means (30) is configured to maintain the operation state of the melting furnace (6) in a standby operation state in which the melting process in the furnace is substantially stopped. Combustion control device for melting furnace. 4. When the operation level in the furnace is maintained in a standby operation state, and when the determination means (31) determines that the detection level falls within the target range, the standby operation is performed. 4. The combustion control device for a waste melting furnace according to claim 3, wherein said control means (30) is configured to release the holding of the state. 5. A deposition section (7) for forming a deposition layer of an object to be processed (R) supplied from the transfer device (5), and a supply from the deposition section (7). A main chamber (8) for melting and processing the object (R) to be processed, and supply means (9) for supplying the object (R) from the deposition section (7) to the main chamber (8); A surface melting furnace (6A) including a combustion device (10) for maintaining the inside of the main chamber (8) at a high temperature, wherein a combustion heat generation amount in the main chamber (8) by the combustion device (10); The deposition section (7) by the supply means (9)
The controller (30) so as to adjust at least one of the supply amount of the object (R) to the main chamber (8) and the melting processing speed of the object (R). The combustion control device for a waste melting furnace according to any one of claims 1 to 4, which comprises: