Combustion control method and combustion control device for garbage incinerator

Abstract

To provide a combustion control method that enables stable combustion in a stoker type refuse incinerator.SOLUTION: A combustion control method includes processes of: determining whether or not a temperature within a primary combustion chamber 4 or a temperature within a secondary combustion chamber 5 is higher than a first set value; and extending an operation cycle of a refuse feeding device 1, a drying stoker 2 and a combustion stoker 3, when the temperature within the primary combustion chamber 4 or the temperature within the secondary combustion chamber 5 is determined to be higher than the first set value.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a combustion control method and a combustion control device for a garbage incinerator.

Background Art

[0002] The following Patent Document 1 describes a stoker type (grate type) garbage incinerator. In this garbage incinerator, the amount of secondary combustion air is adjusted based on the gas temperature in the primary combustion chamber and the gas temperature in the secondary combustion chamber, etc., thereby achieving combustion stabilization.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The properties of the garbage input into the garbage incinerator are not constant. Therefore, a further method for realizing stable combustion is required.

[0005] The present invention has been made in view of the above-described situation. The main object of the present invention is to provide a technique for realizing stable combustion in a stoker type garbage incinerator.

Means for Solving the Problems

[0006] The present invention can be expressed as the invention described in the following items.

[0007] (Item 1) A combustion control method for a garbage incinerator having a feeding device, a drying stoker, a combustion stoker, a primary combustion chamber, and a secondary combustion chamber, wherein the feeding device, the drying stoker, and the combustion stoker are configured to operate periodically, A step of determining whether the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is higher than a first set value; When it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is higher than the first set value, a step of extending the operating cycles of the refuse feeder, the drying stoker, and the combustion stoker; A combustion control method for a garbage incinerator, which has these steps.

[0008] (Item 2) A step of determining whether the oxygen concentration in the exhaust gas in the secondary combustion chamber is lower than a second set value; When it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is lower than the second set value, a step of extending the operating cycles of the refuse feeder, the drying stoker, and the combustion stoker; The combustion control method for a garbage incinerator according to Item 1, which further has these steps.

[0009] (Item 3) A step of determining whether the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is lower than a third set value; When it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is lower than the third set value, a step of immediately operating the refuse feeder, the drying stoker, and the combustion stoker; The combustion control method for a garbage incinerator according to Item 1 or 2, which further has these steps.

[0010] (Item 4) A step of determining whether the oxygen concentration in the exhaust gas in the secondary combustion chamber is higher than a fourth set value; When it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is higher than the fourth set value, a step of immediately operating the refuse feeder, the drying stoker, and the combustion stoker; The combustion control method for a garbage incinerator according to Item 1 or 2, which further has these steps.

[0011] (Item 5) When it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is lower than the third set value, and the refuse feeder, the drying stoker, and the combustion stoker are immediately operated, based on this operation time point, the refuse feeder, the drying stoker, and the combustion stoker perform the regular operation. The combustion control method for a garbage incinerator according to item 3.

[0012] (Item 6) When it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is higher than the fourth set value, and the refuse feeder, the drying stoker, and the combustion stoker are immediately operated, based on this operation time point, the refuse feeder, the drying stoker, and the combustion stoker perform the regular operation. The combustion control method for a garbage incinerator according to item 4.

[0013] (Item 7) A step of determining whether the concentration of harmful substances in the exhaust gas discharged from the secondary combustion chamber is higher than a fifth set value; When it is determined that the concentration of harmful substances in the exhaust gas discharged from the secondary combustion chamber is higher than the fifth set value, a step of extending the operation cycle for the refuse feeder, the drying stoker, and the combustion stoker The combustion control method for a garbage incinerator according to item 1 or 2, further comprising:

[0014] (Item 8) A combustion control device for a garbage incinerator having a refuse feeder, a drying stoker, a combustion stoker, a primary combustion chamber, a secondary combustion chamber, and a processing unit, wherein the refuse feeder, the drying stoker, and the combustion stoker are configured to operate regularly according to a command from the processing unit. Furthermore, it has a primary combustion chamber thermometer for measuring the temperature in the primary combustion chamber and a secondary combustion chamber thermometer for measuring the temperature in the secondary combustion chamber. The processing unit determines whether the temperature in the primary combustion chamber measured by the primary combustion chamber thermometer or the temperature in the secondary combustion chamber measured by the secondary combustion chamber thermometer is higher than a first set value, and when it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is higher than the first set value, the processing unit is configured to perform a process of extending the operation cycles of the dust feeder, the drying stoker, and the combustion stoker. Combustion control device for a garbage incinerator.

Effect of the Invention

[0015] According to the technology of the present invention, stable combustion can be realized in a stoker-type garbage incinerator.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0017] Hereinafter, a stoker-type garbage incinerator (hereinafter sometimes referred to as "garbage incinerator" or "incinerator") according to an embodiment of the present invention will be described with reference to the accompanying drawings. Note that FIG. 1 is a schematic explanatory diagram, and the dimensional ratios and scales are not accurate.

[0018] (Configuration of the garbage incinerator of this embodiment) The garbage incinerator of this embodiment has a feeding device 1, a drying stoker 2, a combustion stoker 3, a primary combustion chamber 4, and a secondary combustion chamber 5 (see Figure 1). Further, this garbage incinerator has a post-combustion stoker 6, a garbage input hopper 7, and a processing unit 8 (see Figure 2). The feeding device 1, the drying stoker 2, the combustion stoker 3, and the post-combustion stoker 6 are configured to operate periodically (that is, at a predetermined cycle) according to commands from the processing unit 8. Here, the processing unit 8 acquires the actual garbage input amount to the feeding device 1 through input from the user or an appropriate detection device (not shown), and based on this garbage input amount, determines the operating cycles of the feeding device 1, the drying stoker 2, the combustion stoker 3, and the post-combustion stoker 6. Specifically, if the actual garbage input amount to the feeding device 1 is excessive compared to the target value, the operating cycle is lengthened, and if the actual garbage input amount is too small compared to the target value, the operating cycle is shortened.

[0019] Furthermore, the garbage incinerator of this embodiment has a primary combustion chamber thermometer 41 for measuring the temperature inside the primary combustion chamber 4, a secondary combustion chamber thermometer 51 for measuring the temperature inside the secondary combustion chamber 5, an oxygen concentration meter 52 for measuring the oxygen concentration of the exhaust gas inside the secondary combustion chamber 5, and a carbon monoxide concentration meter 53 for measuring the carbon monoxide concentration of the exhaust gas inside the secondary combustion chamber 5.

[0020] (Feeding device) The feeding device 1 pushes the garbage input from the garbage input hopper 7 toward the drying stoker 2 at a predetermined cycle, so that the garbage can be supplied to the upper part of the drying stoker 2. Garbage is input into the garbage input hopper 7 by, for example, a crane (not shown). Here, "garbage" refers to waste to be collected from homes and the like and incinerated. The collection routes and properties (such as moisture content) of waste are diverse and also vary depending on the region and time. In this embodiment, the so-called "household garbage" is used as a premise for the explanation, but it is not restricted to this.

[0021] (Drying stoker, combustion stoker, post-combustion stoker) To the drying stoker 2, the combustion stoker 3, and the afterburning stoker 6, primary air sent from the forced draft fan 9 and preheated by the air preheater 19 is supplied through the corresponding forced draft air dampers 21, 31, and 61, respectively. The drying stoker 2 dries the supplied refuse with the primary air. The combustion stoker 3 burns the refuse by supplying primary air to the refuse supplied from the drying stoker 2. The afterburning stoker 6 cools the ash generated by the combustion in the combustion stoker 3 and further burns the unburned components that were not completely burned in the combustion stoker 3.

[0022] Also, to the drying stoker 2, the combustion stoker 3, and the afterburning stoker 6, refuse layer level sensors 22, 32, and 62 are installed, respectively, so that the height (level) of the refuse on each stoker can be detected. Each output of the refuse layer level sensors 22, 32, and 62 is sent to the processing unit 8. Thereby, when the height of the refuse on any of the stokers is too high (for example, exceeds a certain set value), the operating cycle of the corresponding stoker is changed in the processing unit 8 so that the operating cycle becomes shorter, and the combustion of the refuse can be promoted.

[0023] (Primary combustion chamber and secondary combustion chamber) The exhaust gas from the primary combustion chamber 4 is sent to the secondary combustion chamber 5, where the unburned components in the exhaust gas are burned. To the secondary combustion chamber 5, secondary air branched from the primary air is supplied through the secondary air damper 10. The downstream side of the secondary combustion chamber 5 is a boiler 11 having a superheater or the like for recovering the heat of the exhaust gas.

[0024] (Exhaust gas discharge path) The exhaust gas from the boiler 11 in the secondary combustion chamber 5 is discharged from the chimney 17 in a detoxified state through the bag filter 12, the denitration reaction tower 13, the induced draft fan 14, the chimney damper 16, etc. An instrument 18 for measuring the concentration of substances in various exhaust gases is attached to the chimney 17. Specifically, as the instrument 18 of the present embodiment, a hydrogen chloride concentration meter 181, a sulfur oxide concentration meter 182, a nitrogen oxide concentration meter 183, a carbon monoxide concentration meter 184, an oxygen concentration meter 185, and a moisture concentration (water vapor concentration) meter 186 are used. Among these, the hydrogen chloride concentration meter 181, the nitrogen oxide concentration meter 183, and the sulfur oxide concentration meter 182 measure the concentrations of harmful substances (hydrogen chloride, nitrogen oxides, sulfur oxides) in the exhaust gas and function as harmful substance concentration sensors.

[0025] A part of the exhaust gas on the downstream side of the induced draft fan 14 is returned to the secondary combustion chamber 5 through the exhaust gas recirculation damper 15.

[0026] (Processing unit) The processing unit 8 (see Figure 2) is configured to receive measurement values from various instruments (such as thermometers and concentration meters) in the incinerator of the present embodiment. Further, the processing unit 8 determines whether the temperature in the primary combustion chamber 4 measured by the primary combustion chamber thermometer 41 and the temperature in the secondary combustion chamber 5 measured by the secondary combustion chamber thermometer 51 are each higher than the corresponding set values (each set value corresponding to the first set value). Furthermore, when it is determined that either the temperature in the primary combustion chamber 4 or the temperature in the secondary combustion chamber 5 is higher than the corresponding set value (the first set value), the processing unit 8 performs a process of extending the operation cycles of the dust feeder 1, the drying stoker 2, and the combustion stoker 3. As the processing unit 8 of the present embodiment, computer hardware, computer software, or a combination thereof can be used. The processing unit 8 may be a combination of a plurality of functional elements, or may be implemented by a plurality of functional elements distributed remotely. The detailed operation of the processing unit 8 will be described later as the operation of the waste incinerator according to the present embodiment.

[0027] Also, since the overall configuration of the garbage incinerator excluding the processing unit 8 can be the same as the conventional one, a more detailed description of the entire garbage incinerator will be omitted.

[0028] (Operation of the garbage incinerator of this embodiment) Next, the operation of the above-described garbage incinerator will be further described with reference to FIGS. 3 to 4.

[0029] (During steady operation) In the garbage incinerator of this embodiment, the dust feeder 1, the drying stoker 2, the combustion stoker 3, and the afterburning stoker 6 operate at a predetermined cycle (for example, at 5-minute intervals), and garbage is periodically introduced into the primary combustion chamber 4 and can be stirred and burned. This is the same as the conventional garbage incinerator. Note that this predetermined cycle is determined by the processing unit 8 in this embodiment.

[0030] Here, in the garbage incinerator of this embodiment, the processing unit 8 determines whether the temperature in the primary combustion chamber 4 and the temperature in the secondary combustion chamber 5 are higher than the corresponding set values (first set values), respectively.

[0031] Also, in the garbage incinerator of this embodiment, the following determinations by the processing unit 8 are performed in parallel. · Whether the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is lower than the second set value; · Whether the temperature in the primary combustion chamber 4 and the temperature in the secondary combustion chamber 5 are lower than the corresponding set values (third set values), respectively; · Whether the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is higher than the fourth set value; · Whether the respective harmful substance concentrations in the exhaust gas discharged from the secondary combustion chamber 5 are higher than the corresponding fifth set values.

[0032] These determinations are made at a cycle shorter than the operation cycle of the feeding device 1 or the like. For example, it is preferably made at a cycle within 1 / 10 of the operation cycle of the feeding device 1 or the like, more preferably within 1 / 100. The cycles of each determination do not have to be the same and may be different.

[0033] (During abnormal combustion) When the processing unit 8 determines that either the temperature in the primary combustion chamber 4 or the temperature in the secondary combustion chamber 5 is higher than the corresponding set value (the first set value) (SA-1 in FIG. 3), the processing unit 8 extends the operation cycles of the feeding device 1, the drying stoker 2, and the combustion stoker 3 from the default cycle to a longer cycle (SA-3 in FIG. 3). For example, it is extended from a 5-minute interval to a 6-minute interval. Specific examples of the first set value are that the temperature in the primary combustion chamber 4 is 950 to 1000 °C and the temperature in the secondary combustion chamber 5 is 1000 to 1050 °C, but it is not limited to this.

[0034] That either the temperature in the primary combustion chamber 4 or the temperature in the secondary combustion chamber 5 is higher than the corresponding set value means that the garbage is overburned. According to the present embodiment, by the above-described operation (that is, the extension of the operation cycle), overburning of the garbage can be suppressed, and while protecting the primary combustion chamber 4 and the like, normal combustion can be performed. After the operation cycle is extended, when both the temperature in the primary combustion chamber 4 and the temperature in the secondary combustion chamber 5 become lower than the corresponding set values (that is, when they return to normal values), the processing unit 8 returns the operation cycle to its original state.

[0035] When the processing unit 8 determines that the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is lower than the second set value (SA-2 in FIG. 3), the operation cycles of the feeding device 1, the drying stoker 2, and the combustion stoker 3 are similarly extended (SA-3 in FIG. 3). A specific example of the second set value is that the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is 3.5 to 4.5%, but it is not limited to this.

[0036] The fact that the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is lower than the second set value means that the waste is overburning. According to the present embodiment, this operation can also suppress the overburning of the waste, protect the primary combustion chamber 4 and the like, and enable normal combustion. After extending the operation cycle, when the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 becomes higher than the second set value (that is, when it returns to the normal value), the processing unit 8 returns the operation cycle to the original state.

[0037] When the processing unit 8 determines that the temperature in the primary combustion chamber 4 or the temperature in the secondary combustion chamber 5 is lower than the corresponding set value (the third set value) (SB-1 in FIG. 4), the processing unit 8 immediately operates the dust feeder 1, the drying stoker 2, and the combustion stoker 3 (SB-3 in FIG. 4). As a specific example of the third set value, the temperature in the primary combustion chamber 4 is 800 to 850 °C, and the temperature in the secondary combustion chamber 5 is 850 to 900 °C, but it is not limited to this.

[0038] The fact that the temperature in the primary combustion chamber 4 or the temperature in the secondary combustion chamber 5 is lower than the corresponding set value means that the combustion of the waste is insufficient. According to the present embodiment, by the above-described operation, the combustion of the waste can be promoted, and normal combustion can be performed.

[0039] When the processing unit 8 determines that the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is higher than the fourth set value (SB-2 in FIG. 4), the dust feeder 1, the drying stoker 2, and the combustion stoker 3 are immediately operated (SB-3 in FIG. 4). As a specific example of the fourth set value, the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is 6.5 to 7.5%, but it is not limited to this.

[0040] The fact that the oxygen concentration in the exhaust gas in the secondary combustion chamber 5 is higher than the fourth set value means that the combustion of the waste is insufficient. According to the present embodiment, by the above-described operation, the combustion of the waste can be promoted, and normal combustion can be performed.

[0041] Here, in the present embodiment, when the dust feeder 1, the drying stoker 2, and the combustion stoker 3 are immediately operated, based on the time point of this operation (that is, resetting the timer), the dust feeder 1, the drying stoker 2, and the combustion stoker 3 perform periodic operations (SB-4 in FIG. 4). That is, for example, if it is operating at a 5-minute cycle, the starting point of the 5 minutes is set as this operation time.

[0042] In the present embodiment, as a condition for the processing unit 8 to immediately operate the dust feeder 1, it is set that the dust layer level sensor 22 of the drying stoker does not detect (that is, the height of the dust layer does not exceed the set value). Thereby, it is possible to prevent the excessive supply of garbage into the incinerator.

[0043] Furthermore, the processing unit 8 of the present embodiment receives the concentration of harmful substances in the exhaust gas discharged from the secondary combustion chamber 5 from the instrument 18. When it is determined that any of these harmful substance concentrations is higher than the corresponding fifth set value, the operating cycles of the dust feeder 1, the drying stoker 2, and the combustion stoker 3 are extended (step SA-4 in FIG. 3). Here, the harmful substance concentration in the present embodiment refers to the harmful substance concentration in the exhaust gas after the chemical agent for removing harmful substances is introduced in the denitration reaction tower 13 or the like (that is, after the exhaust gas treatment). That any of the harmful substance concentrations in the exhaust gas discharged from the secondary combustion chamber 5 is higher than the corresponding fifth set value means that the addition amount of the additive (chemical agent for removing harmful substances) to the exhaust gas is insufficient for some reason. According to the present embodiment, by the above operation, the combustion of garbage can be suppressed and the amount of harmful substances in the exhaust gas can be reduced. As a result, the concentration of harmful substances in the exhaust gas can be kept low. After the operating cycle is extended, when all the harmful substance concentrations in the exhaust gas become lower than the corresponding fifth set value (that is, when it returns to the normal value), the processing unit 8 returns the operating cycle to the original state. Specific examples of the fifth set value are values of -10 to -20 ppm from the reference value for the hydrogen chloride concentration in the exhaust gas, values of -10 to -20 ppm from the reference value for the sulfur oxide concentration, and values of -10 to -20 ppm from the reference value for the sulfur oxide concentration, but they are not limited to these. Here, the reference value means the emission standard concentration (ppm) determined for each facility.

[0044] Note that the description of the above embodiment is merely an example and does not show the essential configuration of the present invention. The configuration of each part is not limited to the above as long as it can achieve the gist of the present invention.

[0045] For example, in the above-described present embodiment, the temperature in the primary combustion chamber 4 and the temperature in the secondary combustion chamber are respectively determined by the processing unit 8, but only one of them may be sufficient.

[0046] Here, in this specification, being higher or lower than the set value includes the case where it is the same value as the set value.

Explanation of Signs

[0047] 1 Feeding device 2 Dry stoker 21 Dry stoker pushing air damper 22 Dry stoker refuse layer level sensor 3 Combustion stoker 31 Combustion stoker pushing air damper 32 Combustion stoker refuse layer level sensor 4 Primary combustion chamber 41 Primary combustion chamber thermometer 5 Secondary combustion chamber 51 Secondary combustion chamber thermometer 52 Exhaust gas oxygen concentration meter 53 Exhaust gas carbon monoxide concentration meter 6 Afterburning stoker 61 Afterburning stoker pushing air damper 62 Afterburning stoker refuse layer level sensor 7 Refuse input hopper 8 Treatment unit 9 Pushing blower 10 Secondary air damper 11 Boiler 12 Bag filter 13 Denitration reaction tower 14 Induced draft fan 15 Exhaust gas recirculation damper 16 Chimney damper 17 Chimney 18 Instruments 181 Hydrogen chloride concentration meter 182 Sulfur oxide concentration meter 183 Nitrogen oxide concentration meter 184 Carbon monoxide concentration meter 185 Oxygen concentration meter 186 Moisture concentration (water vapor concentration) meter 19 Air preheater

Claims

1. A combustion control method for a garbage incinerator having a feeding device, a drying stoker, a combustion stoker, a primary combustion chamber, and a secondary combustion chamber, wherein the feeding device, the drying stoker, and the combustion stoker are configured to operate periodically, comprising: a step of determining whether the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is higher than a first set value; when it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is higher than the first set value, a step of extending the operating cycle of the feeding device, the drying stoker, and the combustion stoker; a step of determining whether the oxygen concentration in the exhaust gas in the secondary combustion chamber is lower than a second set value; when it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is lower than the second set value, a step of extending the operating cycle of the feeding device, the drying stoker, and the combustion stoker A combustion control method for a garbage incinerator, comprising the above steps.

2. a step of determining whether the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is lower than a third set value; when it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is lower than the third set value, a step of immediately operating the feeding device, the drying stoker, and the combustion stoker The combustion control method for a garbage incinerator according to claim 1, further comprising the above steps.

3. a step of determining whether the oxygen concentration in the exhaust gas in the secondary combustion chamber is higher than a fourth set value; when it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is higher than the fourth set value, a step of immediately operating the feeding device, the drying stoker, and the combustion stoker The combustion control method for a garbage incinerator according to claim 1 or 2, further comprising the above steps.

4. When it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is lower than the third set value and the feeding device, the drying stoker, and the combustion stoker are immediately operated, based on this operation point, the periodic operations of the feeding device, the drying stoker, and the combustion stoker are performed The combustion control method for a garbage incinerator according to claim 2.

5. When it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is higher than the fourth set value and the refuse feeder, the drying stoker, and the combustion stoker are immediately operated, based on this operation timing, the refuse feeder, the drying stoker, and the combustion stoker perform their regular operations. The combustion control method for a garbage incinerator according to claim 3.

6. A step of determining whether the concentration of harmful substances in the exhaust gas discharged from the secondary combustion chamber is higher than a fifth set value; When it is determined that the concentration of harmful substances in the exhaust gas discharged from the secondary combustion chamber is higher than the fifth set value, a step of extending the operation cycle of the refuse feeder, the drying stoker, and the combustion stoker The combustion control method for a garbage incinerator according to claim 1 or 2, further comprising the above.

7. A combustion control device for a garbage incinerator having a refuse feeder, a drying stoker, a combustion stoker, a primary combustion chamber, a secondary combustion chamber, and a processing unit, wherein the refuse feeder, the drying stoker, and the combustion stoker are configured to operate periodically according to a command from the processing unit. Furthermore, it has a primary combustion chamber thermometer for measuring the temperature in the primary combustion chamber and a secondary combustion chamber thermometer for measuring the temperature in the secondary combustion chamber. The processing unit determines whether the temperature in the primary combustion chamber measured by the primary combustion chamber thermometer or the temperature in the secondary combustion chamber measured by the secondary combustion chamber thermometer is higher than a first set value, and when it is determined that the temperature in the primary combustion chamber or the temperature in the secondary combustion chamber is higher than the first set value, the processing unit performs a process of extending the operation cycle of the refuse feeder, the drying stoker, and the combustion stoker, and determines whether the oxygen concentration in the exhaust gas in the secondary combustion chamber is lower than a second set value. When it is determined that the oxygen concentration in the exhaust gas in the secondary combustion chamber is lower than the second set value, the processing unit is configured to perform a process of extending the operation cycle of the refuse feeder, the drying stoker, and the combustion stoker. A combustion control device for a garbage incinerator.

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