JP2008096045A - Combustion controller for stoker type incinerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion controller for a stoker type incinerator, which achieves complete combustion with high combustion efficiency while suppressing generation of noxious components such as NOx and CO by a comparatively simple and inexpensive composition, by accurately carrying out combustion control in the incinerator and mixing ratio control of air-mixed recirculation gas returned to an incinerator side through a recirculation passage provided with a recirculation fan. <P>SOLUTION: The combustion controller for the stoker type incinerator is provided with: an air flow rate adjusting means 30a for adjusting an air flow rate in an air passage 30; a temperature detecting means 35 (35a) for detecting a temperature of the air-mixed recirculation gas, and a combustion control means 60 to which a temperature detected value of the air-mixed recirculation gas from the temperature detecting means 35 (35a) is inputted, for calculating a passage area of the air flow rate adjusting means 36 such that the temperature of the air-mixed recirculation gas becomes a preset target temperature on the basis of the temperature detected value, and which controls the flow rate adjusting means 36 to a passage area integrated value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention introduces primary air from below a stalker into which combustibles such as garbage and industrial waste are introduced, performs primary combustion in a combustion chamber above the stalker, and then performs secondary combustion at an upper portion of the combustion chamber. The present invention relates to a combustion control device for a stoker-type incinerator that performs next combustion.

The stoker-type incinerator is equipped with a stalker in which fixed-stage and movable-stage grates are alternately arranged, and the movable stage is reciprocated by a hydraulic device to agitate the waste (burned material) introduced from the hopper. While moving forward, the waste is dried in the drying zone located upstream of the stoker, and the main combustion is performed while introducing primary air in the next main combustion zone, and burns in the most downstream combustion zone. An incinerator configured to perform combustion every remaining portion.
In such a stoker type incinerator, the recirculated gas extracted from a part of the combustion exhaust gas in the combustion chamber on the stoker is recirculated to the secondary combustion section in the combustion chamber through the recirculation passage and combusted with the secondary air. A technique to be provided is provided by Patent Document 1 (Japanese Patent No. 3558210).

In the technique provided by Patent Document 1, a part of the combustion exhaust gas in the combustion chamber above the stoker is extracted and sent to the heat exchanger as a recirculation gas. In the heat exchanger, the recirculation gas and the primary air and The primary air and the secondary air are preheated by exchanging heat with the secondary air and the recirculated gas is cooled, and the cooled recirculated gas is supplied by a fan disposed on the downstream side of the heat exchanger. All the air in the combustion chamber after the supply of secondary air is supplied to the upstream side of the secondary air supply port in the combustion chamber, and the atmosphere upstream of the secondary air supply port is made a weak reducing atmosphere. The ratio is suppressed to about 1.3, and unburned gas and unburned substances are completely burned and NOx is reduced.
Japanese Patent No. 3558210

However, the above-described prior art of Patent Document 1 has the following problems.
That is, in the prior art, a part of the combustion exhaust gas in the combustion chamber above the stoker is extracted and sent as a recirculation gas to the heat exchanger, and heat exchange with the primary air and the secondary air is performed in the heat exchanger. After cooling the recirculation gas, the cooled recirculation gas is introduced into a portion upstream of the secondary air supply port in the combustion chamber by a fan disposed on the downstream side of the heat exchanger. Therefore, a heat exchanger is required for heat exchange of the recirculated gas with air (primary air and secondary air), lowering the temperature of the recirculated gas, and feeding it to the fan, which complicates the structure of the combustion exhaust gas recirculation system. At the same time, the number of devices increases, leading to an increase in device cost.
In addition, although the temperature of the fan has been lowered by the heat exchanger, combustion exhaust gas having a lot of corrosive components is sent as it is, so that the fan is easily corroded, and the durability and life of the fan are reduced. It is.

In order to solve the problems of the prior art as described above, the present inventors have provided the invention of Japanese Patent Application No. 2005-059846 (filed on Mar. 4, 2005).
In such prior invention, when a part of the flue gas extracted from the combustion chamber above the stoker is returned to the combustion chamber through the recirculation passage by the fan, the recirculation gas is converted into the recirculation gas at the upstream portion of the fan in the recirculation passage. Then, air composed of either primary air or secondary air for combustion is directly mixed and introduced into a recirculation gas recirculation fan, and the recirculation gas composed of this mixed gas is introduced into the combustion chamber by the fan. By refluxing, it is possible to cool the combustion exhaust gas with air and to dilute the combustion exhaust gas by mixing with air and introduce it into the fan. This eliminates the need for a heat exchanger, which simplifies the structure of the combustion exhaust gas recirculation system and reduces the number of components, Thereby reducing the location cost.

  In the prior invention, the recirculation gas introduced into the recirculation gas recirculation fan is cooled and cooled by low-temperature air, and diluted with the air to reduce the flue gas concentration. Further, since the cooling is a recirculation gas in which the corrosive components are reduced by solidifying the corrosive salts in the exhaust gas, the temperature of the fan is lowered and the thermal stress of the fan is reduced. By introducing recirculation gas with reduced corrosion components into the fan, it is possible to suppress fan corrosion, and this will result in a low-cost fan without using expensive heat-resistant materials, Maintains required durability and lifetime.

  However, in the above-mentioned prior application invention, mixing of recirculation gas and air (primary and secondary air for combustion) and recirculation to the incinerator side in the stoker type incinerator, and such mixing and incinerator Only a device for performing recirculation to the side has been proposed. Specific mixing ratio control of recirculation gas and air recirculated to the incinerator side, incinerator by recirculation of air mixed recirculation gas The internal combustion control and the like are not disclosed in the prior invention.

  The present invention has been made in view of such a situation, and an object of the present invention is to control the mixing ratio of the air-mixed recirculated gas to be returned to the incinerator through the recirculation passage provided with the recirculation fan, and the incinerator. A stoker-type incinerator that can perform combustion control with high precision in the inside, and can suppress the generation of harmful components such as NOx and CO, and achieve complete combustion with high combustion efficiency, with a relatively simple and low-cost configuration An object of the present invention is to provide a combustion control apparatus.

  In order to solve the problems of the prior art, the invention according to claim 1 of the present invention introduces primary air from below the stalker into which the incinerated material is charged, and performs primary combustion in the combustion chamber above the stalker. Thereafter, secondary combustion is performed above the combustion chamber, and a recirculation gas extracted from a part of the combustion exhaust gas in the combustion chamber is mixed with air supplied through an air passage. In a combustion control device for a stoker-type incinerator configured to supply air into the furnace through a recirculation passage, an air flow rate adjusting means for adjusting the air flow rate is provided in the air passage, while the air mixed recirculation gas Temperature detection means for detecting the temperature of the air, and a temperature detection value of the air mixed recirculation gas from the temperature detection means are input, and based on the temperature detection value, the temperature of the air mixing recirculation gas is determined in advance. Calculates the passage area of the air flow rate adjusting means such that the constant has been the target temperature, are provided combustion controlling means for controlling the air flow rate adjusting means to the passage area calculation value.

  According to a second aspect of the present invention, in the combustion control device, an air flow rate adjusting means for adjusting an air flow rate is provided in the air passage, and a gas concentration detection for detecting a gas concentration of the air mixed recirculation gas. And a gas concentration detection value of the air mixture recirculation gas from the gas concentration detection means are input, and the gas concentration of the air mixture recirculation gas is set to a preset target gas concentration based on the gas concentration detection value. Combustion control means is provided for calculating the passage area of the air flow rate adjusting means and controlling the air flow rate adjusting means to the calculated passage area value.

  In addition to the invention of claim 2, the invention of claim 3 is provided with NOx concentration detection means for detecting NOx concentration in the combustion exhaust gas and CO concentration detection means for detecting CO concentration in the combustion exhaust gas, and the combustion The control means has a gas concentration of the air mixed recirculation gas set in advance based on the gas concentration detection value input from the gas concentration detection means, and is input from the NOx concentration detection means. Based on the detected NOx concentration value, the NOx concentration in the flue gas becomes equal to or lower than a preset target NOx concentration, and the CO concentration in the flue gas is preset based on the detected CO concentration value input from the CO concentration detecting means. The passage area of the air flow rate adjusting means is calculated so as to be equal to or less than the target CO concentration, and the air flow rate adjusting means is controlled to the calculated passage area value. It is preferable to be configured as described above.

  According to a fourth aspect of the present invention, in the combustion control device, an air flow rate adjusting means for adjusting an air flow rate is provided in the air passage, while a temperature detecting means for detecting the temperature of the air mixed recirculation gas is provided. A gas concentration detection means for detecting a gas concentration of the air mixed recirculation gas; a temperature detection value of the air mixed recirculation gas from the temperature detection means; and a value of the air mixed recirculation gas from the gas concentration detection means. A gas concentration detection value is input, and based on these temperature detection value and gas concentration detection value, the temperature of the air mixed recirculation gas becomes a preset target temperature, and the gas concentration of the air mixed recirculation gas is set in advance. Combustion control means is provided for calculating a passage area of the air flow rate adjusting means so as to achieve a set target gas concentration and controlling the air flow rate adjusting means to the calculated passage area value. To have.

  Further, the invention according to claim 5 of the present invention is the combustion control device, wherein air is mixed in the recirculation gas passage in which air is mixed with the recirculation gas and the air mixed recirculation gas supplied to the combustion chamber flows. A recirculation gas flow rate adjusting means for adjusting the recirculation gas flow rate is provided, a gas flow meter for detecting the flow rate of the air mixed recirculation gas is provided, and the recirculation gas flow rate detection value input from the gas flow meter is set. Based on this, the passage area of the recirculation gas flow rate adjusting means is calculated so that the flow rate of the recirculation gas becomes a preset target flow rate, and the recirculation gas flow rate adjustment means is controlled to the calculated passage area value. Combustion control means is provided.

  In addition to the invention of claim 5, the invention of claim 6 provides a plurality of recirculation gas outlets at a plurality of locations in the combustion chamber, and a plurality of recirculation gas passages connected to the respective recirculation gas outlets. Each of the recirculation gas passages is provided with a recirculation gas flow rate adjusting means for adjusting the air mixture recirculation gas flow rate, and the combustion chamber pressure detection means for detecting the pressure of the combustion chamber is used as the recirculation gas flow rate adjustment means. The combustion control means is provided correspondingly so that the combustion chamber pressures at the plurality of locations become preset target pressures based on the combustion chamber pressure detection values from the plurality of combustion chamber pressure detection means. It is preferable that the passage area of each recirculation gas flow rate adjusting means is calculated and the recirculation gas flow rate adjustment means is controlled to the calculated passage area value.

In the first aspect of the invention, the temperature of the air mixed recirculation gas is preset based on the temperature detection value of the air mixed recirculation gas introduced into the recirculation fan that conveys the air mixed recirculation gas by the combustion control means. The amount of air mixed in the air mixed recirculation gas is controlled by adjusting the opening of the air flow rate adjusting means so that the temperature is less than the maximum allowable temperature. Even when the temperature rises, the temperature of the air-mixed recirculation gas sucked into the recirculation fan can always be kept appropriately below the allowable maximum temperature by increasing the air amount corresponding to the temperature rise. .
Accordingly, overheating of the recirculation fan due to the air mixed recirculation gas can be prevented, and it is not necessary to use a high-cost fan made of a special heat-resistant material for the recirculation fan, and high durability can be maintained.

  In the invention of claim 2, the gas concentration of the air-mixed recirculation gas is determined based on the gas concentration detection value (preferably the oxygen concentration detection value) of the air-mixed recirculation gas introduced into the recirculation fan by the combustion control means. The amount of air mixed into the air-mixed recirculation gas is controlled by adjusting the opening degree (passage area) of the air flow rate adjusting means so as to obtain a preset allowable gas concentration. Even when the oxygen concentration is too low due to the consumption of oxygen, stable combustion above the allowable minimum oxygen concentration is always possible by increasing the opening of the air flow rate adjusting means and increasing the amount of air. It becomes.

  According to the third aspect of the present invention, since the opening degree of the air flow rate adjusting means is adjusted by the combustion control means, the NOx concentration in the combustion exhaust gas is set to be equal to or lower than the allowable maximum NOx concentration, and in the combustion exhaust gas. The CO concentration can be always kept below the allowable maximum CO concentration, and the purification of exhaust gas can be promoted.

According to the invention of claim 4, a synergistic effect between the invention of claim 1 and the invention of claim 2 is obtained.
That is, in the invention of claim 4,
(1) Based on the temperature detection value of the air mixture recirculation gas introduced into the recirculation fan by the combustion control means, the air mixture recirculation gas is controlled so as to have a temperature lower than a preset allowable maximum temperature. Since the amount of air mixed into the air-mixed recirculation gas is controlled by adjusting the opening of the flow rate adjusting means, even if the temperature of the recirculation gas rises for some reason, it can cope with the temperature rise. By increasing the amount of air, the temperature of the air mixed recirculation gas sucked into the recirculation fan can always be kept appropriately below the maximum allowable temperature.
Accordingly, overheating of the recirculation fan due to the air mixed recirculation gas can be prevented, and it is not necessary to use a high-cost fan made of a special heat-resistant material for the recirculation fan, and high durability can be maintained.
(2) Based on the gas concentration detection value (preferably the oxygen concentration detection value) of the air mixed recirculation gas introduced into the recirculation fan by the combustion control means, the gas concentration of the air mixed recirculation gas is preset. The amount of air mixed in the air-mixed recirculation gas is controlled by adjusting the opening of the air flow rate adjusting means so that the allowable gas concentration is reached. For example, oxygen in the recirculation gas is consumed. Even when the oxygen concentration becomes too low, stable combustion above the allowable minimum oxygen concentration is always possible by increasing the air flow rate by increasing the opening of the air flow rate adjusting means.

  According to the fifth aspect of the present invention, the recirculation gas flow rate adjusting means for adjusting the flow rate of the air recirculation gas is provided in the suction passage (recirculation gas passage) through which the air recirculation gas flows, and the air recirculation gas Since the recirculation gas flow rate adjusting means is controlled so that the flow rate of the recirculation gas becomes a preset target flow rate based on the flow rate detection value of the recirculation gas from the gas flow meter for detecting the flow rate of By controlling the opening degree of the recirculation gas flow rate adjusting means so that the flow rate of the recirculation gas becomes the target flow rate, the air mixture recirculation gas completely burns the amount of the air mixture recirculation gas as the secondary air. It is possible to maintain the stable combustion in an amount that can be maintained, average the combustion state, and maintain stable combustion.

  According to the sixth aspect of the present invention, the recirculation gas flow rate adjusting means is provided in each recirculation gas passage provided with recirculation gas blowout ports at a plurality of locations in the combustion chamber and connected to the recirculation gas blowout ports. The combustion chamber pressure detection means is provided correspondingly, the combustion control means detects the recirculation gas pressure near the recirculation gas outlet, and uses the relationship that the recirculation gas amount is proportional to the recirculation gas pressure, Since the recirculation gas pressure is controlled so as to become the target gas pressure, the distribution of the aerated recirculation gas amount to the recirculation gas outlets provided at a plurality of locations in the combustion chamber can be freely adjusted, and the combustion chamber It is possible to supply the aerated recirculation gas uniformly in the circumferential direction of the gas, and the combustion can be averaged.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

[First Embodiment]
FIG. 1 is a configuration diagram of a stoker-type incinerator according to a first embodiment of the present invention, FIG. 2 is a schematic configuration diagram of combustion control means in the first embodiment, and FIG. 3 is a combustion control block diagram in the first embodiment. It is.
In FIG. 1, 1 is a waste hopper into which combustibles such as garbage and industrial waste are charged, and 2 is a stoker type incinerator. This stoker-type incinerator 2 mainly comprises a drying zone stoker 21 that mainly constitutes a drying zone, a main combustion zone stoker 22 that mainly constitutes a combustion zone, and a main combustion zone, at the bottom of the furnace at the inlet from the garbage hopper 1. In addition, a combustion zone stoker 23 is laid. The dry zone stalker 21 is located on the most upstream side, the main combustion zone stalker 22 is located on the downstream side of the dry zone stalker 21, and the vertical combustion zone stalker 23 is located on the downstream side downstream of the main combustion zone stalker 22. Yes. Here, the main combustion zone refers to an area where a flame is raised on the dust layer and burned.
Each of the stokers 21, 22, and 23 is provided with a moving grate disposed between fixed grate, and after putting in garbage (combustible material) by reciprocating movement of the moving grate, the garbage is put into the stalker 21. , And the main combustion is performed with the stoker 22, and finally the combustion is performed with the stoker 23. In this embodiment, the number of the main combustion zone stokers 22 is three, but it is sufficient that one or a plurality of them are provided. 8 is an ash collection tank.
A primary combustion chamber 3 is provided above the stokers 21, 22, and 23, and a secondary combustion chamber 4 is further provided above the primary combustion chamber 3.
Reference numerals 19 a, 19 b, 19 c, and 19 d are recirculation gas blowing nozzles installed facing the secondary combustion chamber 4. Reference numeral 81 denotes a boiler connected to the exhaust gas outlet of the secondary combustion chamber 4.

  The dry zone stalker 21, the combustion zone stalker 22 and the vertical combustion zone stalker 23 are provided with primary air pipes 51, 52 (three) and 53 which open to the lower wind boxes, respectively, from the primary air pipe. It is comprised so that air may be supplied. 6 is a primary air supply fan, and 5 is a primary air main pipe connecting the fan 6 and each of the primary air pipes 51, 52 (three), 53. The primary air pumped from the fan 6 is primary The air main pipe 5 is distributed to the primary air pipes 51, 52, 53. The primary air pipes 51, 52, 53 are provided with open / close dampers 54, 55, 56 for opening and closing them. The primary air main pipe 5 is provided with an open / close damper 7 for opening and closing the primary air main pipe 5.

  Reference numeral 40 denotes a recirculation gas extraction port for extracting a part of the combustion exhaust gas in the primary combustion chamber 3 (or in the secondary combustion chamber 4) as a recirculation gas, which is extracted from the recirculation gas extraction port 40. The recirculation gas is introduced into the suction passage 31 of the recirculation fan 13 through the recirculation passage 16, the mixed gas passage 14, and the cyclone 12 that separates solid foreign matters in the mixed gas. That is, the recirculation gas outlet 40 and the suction passage 31 are connected via the recirculation passage 16, and the suction passage 31 is provided with a gas damper 013 that opens and closes the inlet of the recirculation fan 13.

Reference numeral 30 denotes a mixed air passage branched from the primary air main pipe 5 and connected to a suction passage 31 which is an upstream portion of the recirculation fan 13, and 30a is an air damper (open / close damper) for opening and closing the mixed air passage 30. When the damper 30a is opened, the primary air from the primary air main pipe 5 is introduced into the inlet of the recirculation fan 13 of the suction passage 31 through the mixed air passage 30, and the primary air is mixed with the recirculation gas, and the mixed gas passage 14 is introduced into the recirculation fan 13 through the cyclone 12 and the suction passage 31.
The air damper 30a is configured to automatically adjust the opening degree (flow rate adjustment) in response to a control signal from a fuel control means 60, which will be described later. By adjusting the opening degree of the air damper 30a, mixed air The flow rate of the primary air flowing through the passage 30 is adjusted, and the mixed air of the recirculation gas introduced into the recirculation fan 13 through the mixed gas passage 14, the cyclone 12 and the suction passage 31 and the primary air is remixed. The mixing ratio between the recirculation gas and the primary air of the circulation gas is adjusted.

  Then, the air mixed recirculation gas after the primary air mixing that has been pressure-fed by the recirculation fan 13 to the recirculation passage 15 is branched into two recirculation passages 17 and 18, and the one side recirculation passage 17 is connected to one side. The recirculation gas blowing nozzles 19a and 19c are fed into the two rows of recirculation gas blow nozzles 19a and 19c. The recirculation gas blow nozzles 19b and 19d are fed from the other recirculation passage 18 into the two recirculation gas blowing nozzles 19b and 19d. And 19b and 19d are ejected into the secondary combustion chamber 4. Further, a branch gas damper B33 for opening and closing the recirculation passage 17 is provided, and a branch gas damper A32 for opening and closing the recirculation passage 18 is provided.

Reference numeral 35 denotes a temperature sensor that is provided in the recirculation passage 15 and detects the temperature of the air mixed recirculation gas (a temperature sensor 35a may be provided in the mixed gas passage 14. The following description will be given with respect to the temperature sensor 35. ). An air damper opening detector 36 detects the opening of the air damper 30a.
The stoker type incinerator 2 according to the first embodiment of the present invention includes a combustion control means 60, and the combustion control means 60 is provided with a temperature sensor 35 (including 35 a), an air damper 30 a and an air damper opening detector 36. The temperature detection value of the air mixed recirculation gas is input from the temperature sensor 35, and the opening detection value of the air damper 30a is input from the air damper opening detector 36. Based on the value, the opening degree of the air damper 30a is adjusted so that the temperature of the air mixed recirculation gas becomes the target temperature, and the mixing ratio of the recirculation gas and the primary air in the air mixed recirculation gas is set as the target mixing The ratio is controlled.

  During operation of the stoker-type incinerator 2, a part of the combustion exhaust gas extracted from the combustion chamber (primary combustion chamber 3 or secondary combustion chamber 4) above the stoker through the recirculation gas extraction port 40 is used as a recirculation gas. The air is mixed with the primary air from the mixed air passage 30 through the recirculation passage 16 and introduced into the recirculation fan 13 through the mixed gas passage 14, the cyclone 12 and the suction passage 31.

Then, the air-mixed recirculation gas after the primary air mixing that has been pressure-fed by the recirculation fan 13 to the recirculation passage 15 is branched into two recirculation passages 17 and 18, and the recirculation gas blowing nozzles 19a and 19c on one side are branched. And the recirculation gas blowing nozzles 19b and 19d on the other side, respectively, and are blown into the secondary combustion chamber 4 from the recirculation gas blowing nozzles 19a and 19c and 19b and 19d.
By doing so, it becomes possible to cool the recirculated gas comprising a part of the combustion exhaust gas with the primary air, dilute the combustion exhaust gas by mixing with the primary air, and introduce it into the recirculation fan 13.

Next, the combustion control means and the combustion control procedure in the first embodiment will be described with reference to FIGS.
The combustion control means 60 of this embodiment includes a gas temperature comparison unit 61, a reference gas temperature setting unit 62, a gas temperature / air amount setting unit 63, an air amount adjustment amount calculation unit 64, an air damper opening adjustment amount calculation unit 65, and An air damper opening calculation unit 66 is provided, and the temperature detection value of the air mixed recirculation gas detected by the temperature sensor 35 is input to the gas temperature comparison unit 61 of the combustion control means 60. In the reference gas temperature setting unit 62, an allowable maximum temperature (preferably about 300 ° C.) of the air mixed recirculation gas sent to the recirculation fan 13 is set.
Further, the gas temperature comparison unit 61 calculates a temperature deviation between the temperature detection value of the air mixture recirculation gas from the temperature sensor 35 and the allowable maximum temperature set in the reference gas temperature setting unit 62. .
Then, the opening degree of the air damper 30a is calculated by the air damper opening calculating means 600 shown in FIG.

In FIG. 3, the calculated value of the temperature deviation from the gas temperature comparison unit 61 is input to the air amount adjustment amount calculation unit 64.
The gas temperature / air amount setting unit 63 includes an air amount of air supplied through the mixed air passage 30, and the air mixed recirculation gas temperature after mixing the air and the recirculation gas from the recirculation passage 16. This relationship is preset by experimental results or simulation calculations.
In addition, the air amount adjustment amount calculation unit 64 calculates (extracts) an air amount deviation corresponding to the calculated value of the temperature deviation from the gas temperature comparison unit 61 from the gas temperature / air amount setting unit 63, and This is output to the damper opening adjustment amount calculation unit 65. In the air damper opening adjustment amount calculation unit 65, the relationship between the air amount and the air damper opening is set as the opening characteristic of the air damper 30a. In the air damper opening adjustment amount calculation unit 65, The air damper opening adjustment amount corresponding to the air amount deviation calculation value from the air amount adjustment amount calculation unit 64 is calculated and input to the air damper opening calculation unit 66.
In the air damper opening calculation unit 66, the air damper opening adjustment value from the air damper opening adjustment amount calculation unit 65 is added to the detected opening value of the air damper 30a input from the air damper opening detector 36. The target value of the air damper opening, that is, the air damper opening corresponding to the reference gas temperature is calculated by adding or subtracting the amount, and the air damper 30a is controlled to the target opening.

Thus, in the combustion control apparatus for the stoker type incinerator 2 according to the first embodiment, the air mixing recirculation is performed by the combustion control means 60 based on the temperature detection value of the air mixing recirculation gas passing through the recirculation fan 13. The amount of air mixed in the air mixed recirculation gas is controlled by adjusting the opening degree of the air damper 30a so that the gas temperature is equal to or lower than a preset allowable maximum temperature. Even when the temperature of the circulating gas rises, the temperature of the air mixed recirculation gas sucked into the recirculation fan 13 is always kept below the allowable maximum temperature by increasing the amount of air corresponding to the temperature rise. Can be held in.
Thereby, overheating of the recirculation fan 13 by the air mixed recirculation gas can be prevented, and it is not necessary to use a high-cost fan made of a special heat-resistant material for the recirculation fan 13, and high durability can be maintained. it can.

[Second Embodiment]
FIG. 4 is a block diagram of a stoker type incinerator according to the second embodiment of the present invention, FIG. 5 is a schematic block diagram of combustion control means in the second embodiment, and FIG. 6 is a block diagram of combustion control in the second embodiment. It is.
In the second embodiment of the present invention, the oxygen concentration is used as the gas concentration in the means for detecting the gas concentration of the air mixed recirculation gas and controlling the opening degree of the air damper 30a based on the gas concentration. Instead of the oxygen concentration, the concentration of other components in the air mixed recirculation gas such as CO ₂ can be used.
That is, in the stoker-type incinerator 2 of the second embodiment of the present invention, as shown in FIG. 4, an oxygen concentration meter 37 (or oxygen concentration meter 37a) for detecting the oxygen concentration in the air mixed recirculation gas, A NOx concentration sensor 38 for detecting the NOx concentration in the combustion exhaust gas at the outlet side of the secondary combustion chamber 4 and a CO concentration sensor 39 for detecting the CO concentration are provided.
As shown in FIGS. 5 and 6, the combustion control means 60 of the present embodiment includes an oxygen concentration comparison unit 71, a reference oxygen concentration setting unit 72, a NOx concentration comparison unit 73, a reference NOx concentration setting unit 74, and a CO concentration. Comparison unit 75, reference CO concentration setting unit 76, air amount adjustment amount calculation unit 77, oxygen concentration / air amount setting unit 78, air amount adjustment amount calculation unit 79, NOx concentration / air amount setting unit 80, air amount adjustment amount calculation 81, a CO concentration / air amount setting unit 82, an air damper opening adjustment amount calculating unit 65, and an air damper opening calculating unit 66, and based on the oxygen concentration detection value from the oxygen concentration meter 37, the air mixing The opening degree of the air damper 30a is calculated such that the oxygen concentration of the recirculation gas becomes a preset target oxygen concentration, and the opening degree of the air damper 30a is controlled to the opening degree calculation value.
Further, the combustion control means 60 determines that the NOx concentration in the combustion exhaust gas is equal to or lower than a preset target NOx concentration based on the NOx concentration detection value from the NOx concentration sensor 38 and the CO concentration detection value from the CO concentration sensor 39. In addition, the opening degree of the air damper 30a is calculated so that the CO concentration in the combustion exhaust gas is equal to or lower than a preset target CO concentration, and the opening degree of the air damper 30a is controlled to the opening degree calculation value.

Next, based on FIG.5 and FIG.6, the combustion control means and combustion control procedure in 2nd Embodiment of this invention are demonstrated.
FIG. 5 shows an extracted procedure for calculating the opening of the air damper 30a by the air damper opening calculation means 600 based on the oxygen concentration detection value from the oximeter 37 (37a) in the second embodiment. However, in the following description of the operation, combustion control using the NOx concentration and the CO concentration in the combustion exhaust gas in addition to the oxygen concentration will be described with reference to FIG.
In FIG. 6, the oxygen concentration detection value of the air recirculation gas detected by the oxygen concentration meter 37 (or oxygen concentration meter 37 a) is input to the oxygen concentration comparison unit 71 of the combustion control means 60. Further, the detected NOx concentration value in the combustion exhaust gas detected by the NOx concentration sensor 38 is input to the NOx concentration comparison unit 73 of the combustion control means 60. Further, the detected CO concentration value in the combustion exhaust gas detected by the CO concentration sensor 39 is input to the CO concentration comparison unit 75 of the combustion control means 60.
In the reference oxygen concentration setting unit 72, an allowable minimum oxygen concentration of the air mixed recirculation gas sent to the recirculation fan 13 is set. In the reference NOx concentration setting unit 74, an allowable maximum NOx concentration in the combustion exhaust gas is set. In the reference CO concentration setting unit 76, an allowable maximum CO concentration in the combustion exhaust gas is set.

The oxygen concentration comparison unit 71 calculates an oxygen concentration deviation between the oxygen concentration detection value in the air mixed recirculation gas from the oxygen concentration meter 37 and the allowable minimum oxygen concentration set in the reference oxygen concentration setting unit 72. , And input to the air amount adjustment amount calculation unit 77.
Further, the NOx concentration comparison unit 73 calculates the NOx concentration deviation between the detected NOx concentration in the combustion exhaust gas from the NOx concentration sensor 38 and the allowable maximum NOx concentration set in the reference NOx concentration setting unit 74, This is input to the air amount adjustment amount calculation unit 79.
Further, the CO concentration comparison unit 75 calculates a CO concentration deviation between the detected CO concentration value in the combustion exhaust gas from the CO concentration sensor 39 and the allowable maximum CO concentration set in the reference CO concentration setting unit 76, This is input to the air amount adjustment amount calculation unit 81.

In the oxygen concentration / air amount setting unit 78, the air mixture recirculation gas after mixing the air amount of the air supplied through the mixed air passage 30 and the air and the recirculation gas from the recirculation passage 16. The relationship with the oxygen concentration is preset by experimental results or simulation calculations.
Further, in the NOx concentration / air amount setting unit 80, the relationship between the amount of air supplied through the mixed air passage 30 and the NOx concentration in the combustion exhaust gas is preset by experimental results or simulation calculation.
Further, in the CO concentration / air amount setting unit 82, the relationship between the air amount of the air supplied through the mixed air passage 30 and the CO concentration in the combustion exhaust gas is preset by an experimental result or simulation calculation.

Then, the air amount adjustment amount calculation unit 77 calculates (extracts) an air amount deviation corresponding to the calculated value of the oxygen concentration deviation from the oxygen concentration comparison unit 71 from the oxygen concentration / air amount setting unit 78 to extract the air amount deviation. This is input to the damper opening adjustment amount calculation unit 65.
In addition, the air amount adjustment amount calculation unit 79 calculates (extracts) an air amount deviation corresponding to the calculated value of the NOx concentration deviation from the NOx concentration comparison unit 73 from the NOx concentration / air amount setting unit 80 to extract air. This is input to the damper opening adjustment amount calculation unit 65.
Further, the air amount adjustment amount calculation unit 81 calculates (extracts) an air amount deviation corresponding to the calculated value of the CO concentration deviation from the CO concentration comparison unit 75 from the CO concentration / air amount setting unit 82 to extract the air amount. This is input to the damper opening adjustment amount calculation unit 65.

  In the air damper opening adjustment amount calculation unit 65, the relationship between the air amount and the air damper opening is set as the opening characteristic of the air damper 30a. In the air damper opening adjustment amount calculation unit 65, An air damper opening adjustment amount based on an air amount deviation corresponding to the oxygen concentration deviation, an air damper opening adjustment amount based on an air amount deviation corresponding to the NOx concentration deviation, and an air amount deviation corresponding to the CO concentration deviation The air damper opening adjustment amount based on the air damper is sequentially calculated, the optimum air damper opening adjustment amount is selected from the air damper opening adjustment amount, and is input to the air damper opening calculation unit 66.

In the air damper opening calculation unit 66, the air damper opening adjustment amount from the air damper opening adjustment amount calculator 65 is added to the opening detection value of the air damper 30 a input from the air damper opening detector 36. Is added or subtracted to calculate the target value of the air damper opening, that is, the opening of the air damper 30a adapted to the reference oxygen concentration, the reference NOx concentration or the reference CO concentration, and the air damper 30a is opened. Control at a time.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

As described above, in the combustion control device for the stoker type incinerator 2 according to the second embodiment, the air based on the oxygen concentration detection value of the air mixed recirculation gas introduced into the recirculation fan 13 by the combustion control means 60. Since the opening degree of the air damper 30a is adjusted so that the oxygen concentration of the mixed recirculation gas is equal to or higher than a preset allowable minimum oxygen concentration, the amount of air mixed into the air mixed recirculation gas is controlled. Even when oxygen in the recirculated gas is consumed and the oxygen concentration becomes too low, stable combustion above the allowable minimum oxygen concentration is always achieved by increasing the air amount by increasing the opening of the air damper 30a. It becomes possible.
Further, by adjusting the opening degree of the air damper 30a by the combustion control means 60, the NOx concentration in the combustion exhaust gas is made lower than the allowable maximum NOx concentration, and the CO concentration in the combustion exhaust gas is made lower than the allowable maximum CO concentration, respectively. It can be kept at all times, and the exhaust gas purification can be promoted.

[Third Embodiment]
FIG. 7 is a block diagram of a stoker-type incinerator according to the third embodiment of the present invention, and FIG. 8 is a flowchart of the combustion control based on the oxygen concentration and the temperature of the air mixed recirculation gas in the third embodiment.
The third embodiment of the present invention is a combination of the first embodiment shown in FIGS. 1 to 3 and the second embodiment shown in FIGS.
That is, in the third embodiment, the combustion control means 60 uses the temperature detection value of the air mixed recirculation gas by the temperature sensor 35a (or the temperature sensor 35 in FIG. 1) to detect the air mixed recirculation gas. The amount of air mixed into the air mixed recirculation gas is controlled by adjusting the opening of the air damper 30a so that the temperature is lower than the preset allowable maximum temperature, and oxygen in the air mixed recirculation gas Based on the oxygen concentration detection value by the oxygen concentration meter 37 for detecting the concentration, the opening degree of the air damper 30a is calculated such that the oxygen concentration of the air mixed recirculation gas is equal to or higher than a preset allowable minimum oxygen concentration, and the air The opening degree of the damper 30a is controlled to the opening degree calculation value.
In the third embodiment, as in the second embodiment, a NOx concentration sensor 38 that detects the NOx concentration in the combustion exhaust gas on the outlet side of the secondary combustion chamber 4 and a CO concentration sensor that detects the CO concentration. 39, and the NOx concentration in the combustion exhaust gas is equal to or lower than a preset target NOx concentration based on the NOx concentration detection value from the NOx concentration sensor 38 and the CO concentration detection value from the CO concentration sensor 39. In addition, the opening degree of the air damper 30a is calculated so that the CO concentration in the combustion exhaust gas can be equal to or lower than a preset target CO concentration, and the opening degree of the air damper 30a is controlled to the opening degree calculation value. .
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

FIG. 8 shows a flowchart in which the combustion control based on the oxygen concentration and the temperature of the air mixed recirculation gas in the third embodiment is extracted, and the combustion control is performed in the following procedure.
In other words, the oxygen concentration Cg of the air mixed recirculation gas is detected by the oxygen concentration meter 37 (step (1)), the detected oxygen concentration value Cg is compared with the target oxygen concentration Cgo (step (2)), and the oxygen concentration Cg. Is larger than the target oxygen concentration Cgo (Cg> Cgo), the air damper 30a is closed to reduce the amount of air (step (3)). When the oxygen concentration Cg is smaller than the target oxygen concentration Cgo (Cg <Cgo) Opens the air damper 30a to increase the amount of air (step (4)).
Then, following the opening control of the air damper 30a by the oxygen concentration, the opening control of the air damper 30a by the temperature of the air mixed recirculation gas is performed in the following procedure.
That is, in FIG. 8, the temperature Tg of the air mixed recirculation gas is detected by the temperature sensor 35a (or the temperature sensor 35 in FIG. 1) (step (5)), and this temperature detection value Tg is compared with the target temperature Tgo. (Step (6)), when the temperature detection value Tg coincides with the target temperature Tg0, the opening degree of the air damper 30a is maintained at the current state, and when the temperature detection value Tg is higher than the target temperature Tgo (Tg > Tgo), the air damper 30a is opened to increase the amount of air, and the temperature Tg of the air mixed recirculation gas is lowered (step (7)). When the temperature detection value Tg is lower than the target temperature Tgo (Tg <Tgo) Closes the air damper 30a to reduce the amount of air, and raises the temperature Tg of the air mixed recirculation gas (step (8)).

According to the third embodiment of the present invention, the synergistic effect of the first embodiment and the second embodiment can be obtained.
That is, in the combustion control device for the stoker-type incinerator 2 according to the third embodiment,
(1) Based on the temperature detection value of the air mixed recirculation gas introduced into the recirculation fan 13 by the combustion control means 60, the temperature of the air mixed recirculation gas is set to be equal to or lower than a preset allowable maximum temperature. Since the amount of air mixed in the air mixed recirculation gas is controlled by adjusting the opening of the air damper 30a, even if the temperature of the recirculation gas rises for some reason, the temperature rise is accommodated. By increasing the amount of air, the temperature of the air-mixed recirculation gas sucked into the recirculation fan 13 can always be properly maintained below the maximum allowable temperature.
As a result, overheating of the recirculation fan 13 due to the air-mixed recirculation gas can be prevented, and it is not necessary to use a high-cost fan made of a special heat-resistant material for the recirculation fan 13, and high durability can be maintained. .
(2) Based on the oxygen concentration detection value of the air mixed recirculation gas introduced into the recirculation fan 13 by the combustion control means 60, the oxygen concentration of the air mixed recirculation gas is equal to or higher than a preset allowable minimum oxygen concentration. Since the air amount mixed in the air recirculation gas is controlled by adjusting the opening of the air damper 30a so that the oxygen concentration in the recirculation gas is consumed and the oxygen concentration becomes too low However, by increasing the opening of the air damper 30a and increasing the amount of air, stable combustion can always be performed above the allowable minimum oxygen concentration.
Further, by adjusting the opening degree of the air damper 30a by the combustion control means 60, the NOx concentration in the combustion exhaust gas is made lower than the allowable maximum NOx concentration, and the CO concentration in the combustion exhaust gas is made lower than the allowable maximum CO concentration, respectively. It can be kept at all times, and the exhaust gas purification can be promoted.

[Fourth Embodiment]
FIG. 9 is a configuration diagram of a stoker-type incinerator according to the fourth embodiment of the present invention, and FIG. 10 is a combustion control flowchart in the fourth embodiment.
In the fourth embodiment of the present invention, in addition to the third embodiment, an intake passage (re-cycle) through which air is mixed with the recirculation gas and the air mixed recirculation gas supplied to the secondary combustion chamber 4 flows. A gas damper 013 for adjusting the air mixing recirculation gas flow rate is provided in the circulation gas passage 31), and the flow rate of the air mixing recirculation gas is detected by the mixed gas flow meter 90 provided in the recirculation passage 15 to control combustion. The opening degree of the gas damper 013 is controlled by the means 60 so that the flow rate of the recirculation gas becomes a preset target flow rate based on the flow rate detection value of the air mixture recirculation gas from the gas flow meter.
That is, steps (1) to (8) in FIG. 10 are the same as those in the third embodiment shown in FIG.

In FIG. 10, the combustion control means 60 compares the detected flow rate value Qg of the air mixture recirculation gas from the mixed gas flow meter 90 with a preset target flow rate Qgo (step (9)). When the detected flow rate value Qg is larger than the target flow rate Qgo (Qg> Qgo), the gas damper 013 is closed (strictly, the opening is reduced) (step (10)), and the detected flow rate value Qg is greater than the target flow rate Qgo. Is smaller (Qg <Qgo), the gas damper 013 is opened (strictly, the opening degree is increased) (step (11)), and the flow rate of the air-mixed recirculation gas is controlled to become the target flow rate.
Therefore, by controlling the opening degree of the gas damper 013 so that the flow rate Qg of the recirculation gas becomes the target flow rate Qgo, the amount of the air mixture recirculation gas as the secondary air is completely combusted. It is possible to stably maintain the amount that can be achieved, and it is possible to average the combustion state and maintain stable combustion.

Further, in the fourth embodiment of the present invention, the recirculation gas blowing nozzles 19a and 19c and the recirculation gas blowing nozzles 19b and 19d are provided opposite to each other at the left and right positions of the secondary combustion chamber 4, and these recirculations are provided. The recirculation gas passages 17 and 18 connected to the gas blowing nozzles 19a and 19c and the recirculating gas blowing nozzles 19b and 19d are provided with a branch gas damper B33 and a branch gas damper A32 for adjusting the air mixed recirculation gas flow rate, respectively. Gas pressure sensors B42 for detecting these pressures (hereinafter referred to as recirculation gas pressure) in the vicinity of the recirculation gas blowing nozzles 19a, 19c and the recirculation gas blowing nozzles 19b, 19d of the air mixed recirculation gas in the secondary combustion chamber 4. And a gas pressure sensor A41 is provided.
In the fourth embodiment, the gas pressure sensor B41 and the gas pressure sensor A41 provided by the combustion control means 60 so as to be opposed to a plurality of left and right locations (two locations on the left side and two locations on the right side) of the secondary combustion chamber 4 are provided. Based on the detected value of the gas pressure from the gas, the opening degree of each branch gas damper B33 and branch gas damper A32 is calculated so that the gas pressures at the plurality of locations become preset target pressures. It is configured to control the opening degree calculation value of the gas damper A32.

That is, in FIG. 10, the combustion control means 60 compares the gas pressure detection value Pg by the gas pressure sensor B42 and the gas pressure sensor A41 with a preset target gas pressure Pgo (step (12) in FIG. 10). When the gas pressure detection value Pg is larger than the target gas pressure Pgo (Pg> Pgo), the branch gas damper B33 and the branch gas damper A32 are closed (strictly, the opening degree is reduced) (step (13)), and the recirculated gas The amount of the aerated recirculation gas to the blowing nozzles 19a and 19c and the recirculation gas blowing nozzles 19b and 19d is reduced.
When the gas pressure detection value Pg is smaller than the target gas pressure Pgo (Pg <Pgo), the branch gas damper B33 and the branch gas damper A32 are opened (strictly, the opening degree is increased) (step (14)), and the recirculated gas The amount of the aerated recirculated gas to the blowing nozzles 19a and 19c and the recirculating gas blowing nozzles 19b and 19d is increased.

Since the combustion control apparatus of the stoker type incinerator 2 according to the fourth embodiment is configured as described above, the recirculation gas blowing nozzle is used by using the relationship that the recirculation gas amount is proportional to the recirculation gas pressure. By detecting the recirculation gas pressure in the vicinity and controlling the opening degree of the branch gas damper B33 and the branch gas damper A32 so that the recirculation gas pressure Pg becomes the target gas pressure Pgo, air mixing re-circulation as secondary air can be performed. The amount of the circulating gas can be stably maintained at an amount that allows the air-mixed recirculated gas to be completely combusted, and the combustion state can be averaged to maintain the stable combustion.
Further, based on the gas pressure sensor B42 provided opposite to the left and right locations (two locations on the left side and two locations on the right side) of the secondary combustion chamber 4 and the detected values of the gas pressure from the gas pressure sensor A41, Since the opening degree of each branch gas damper B33 and branch gas damper A32 is calculated so that the gas pressure at the location becomes a preset target pressure, the opening degree calculation values of each branch gas damper B33 and branch gas damper A32 are controlled. The distribution of the aerated recirculation gas amount to the recirculation gas blowing nozzles 19a and 19c and the recirculation gas blowing nozzles 19b and 19d provided at a plurality of locations in the secondary combustion chamber 4 can be freely adjusted, and the circumferential direction of the combustion chamber It is possible to uniformly supply the aerated recirculation gas to the combustion chamber and to average the combustion.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

It is a lineblock diagram showing the stoker type incinerator concerning a 1st embodiment of the present invention. It is a schematic block diagram which shows the combustion control means in the said 1st Embodiment. It is a combustion control block diagram in the said 1st Embodiment. It is a block diagram which shows the stoker type incinerator which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows the combustion control means in the said 2nd Embodiment. It is a combustion control block diagram in the said 2nd Embodiment. It is a block diagram which shows the stoker type incinerator which concerns on 3rd Embodiment of this invention. It is a combustion control flowchart in the said 3rd Embodiment. It is a block diagram which shows the stoker type incinerator which concerns on 4th Embodiment of this invention. It is a combustion control flowchart in the said 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste hopper 2 Stoker-type incinerator 3 Primary combustion chamber 4 Secondary combustion chamber 5 Primary air main pipe 13 Recirculation fan 013 Gas damper 14 Inlet passage 15, 16, 17 Recirculation passage 19a, 19b, 19c, 19d Recirculation gas blowing nozzle 21 dry zone stalker 22 main combustion zone stalker 23 alternate combustion zone stalker 30 mixed air passage 30a air damper 31 intake passage 32 branch gas damper A
33 Branch gas damper B
35, 35a Temperature sensor 36 Air damper opening detector 37, 37a Oxygen concentration meter 38 NOx concentration sensor 39 CO concentration sensor 40 Recirculation gas outlet 41 Gas pressure sensor A
42 Gas pressure sensor B
51, 52, 53 Primary air pipe 60 Combustion control means 90 Mixed gas flow meter

Claims (6)

  After introducing primary air from below the stalker into which the incinerator is charged and performing primary combustion in the combustion chamber above the stalker, secondary combustion is performed above the combustion chamber, and combustion exhaust gas in the combustion chamber A stoker-type incinerator configured to mix a recirculation gas extracted from a part of the air and air supplied through an air passage and supply the air mixed recirculation gas into the furnace through a recirculation passage by a fan In the combustion control apparatus, an air flow rate adjusting means for adjusting an air flow rate is provided in the air passage, a temperature detecting means for detecting a temperature of the air mixed recirculation gas, and the air mixed recirculation from the temperature detecting means. A gas temperature detection value is inputted, and a passage area of the air flow rate adjusting means is calculated based on the temperature detection value so that the temperature of the air mixed recirculation gas becomes a preset target temperature. , Combustion control device for stoker incinerators, characterized in that a combustion control means for controlling the air flow rate adjusting means to the passage area calculation value.   After introducing primary air from below the stalker into which the incinerator is charged and performing primary combustion in the combustion chamber above the stalker, secondary combustion is performed above the combustion chamber, and combustion exhaust gas in the combustion chamber A stoker-type incinerator configured to mix a recirculation gas extracted from a part of the air and air supplied through an air passage and supply the air mixed recirculation gas into the furnace through a recirculation passage by a fan In the combustion control apparatus, an air flow rate adjusting means for adjusting an air flow rate is provided in the air passage, a gas concentration detecting means for detecting a gas concentration of the air mixed recirculation gas, and the air from the gas concentration detecting means A gas concentration detection value of the mixed recirculation gas is inputted, and the air flow such that the gas concentration of the air mixed recirculation gas becomes a preset target gas concentration based on the gas concentration detection value. Calculates the passage area of the adjusting means, combustion control device for stoker incinerators, characterized in that said air flow regulating means is provided combustion controlling means for controlling the passage area calculation value.   NOx concentration detection means for detecting NOx concentration in the combustion exhaust gas and CO concentration detection means for detecting CO concentration in the combustion exhaust gas are provided, and the combustion control means is configured to receive the gas concentration input from the gas concentration detection means. Based on the detected value, the gas concentration of the air mixed recirculation gas becomes a preset target gas concentration, and the NOx concentration in the combustion exhaust gas is preset based on the detected NOx concentration value input from the NOx concentration detecting means. Of the air flow rate adjusting means so that the CO concentration in the combustion exhaust gas becomes equal to or lower than a preset target CO concentration based on the CO concentration detection value inputted from the CO 2 concentration detection means. The passage area is calculated, and the air flow rate adjusting means is configured to control the passage area calculated value. 2. A combustion control device for a stoker-type incinerator according to 2.   After introducing primary air from below the stalker into which the incinerator is charged and performing primary combustion in the combustion chamber above the stalker, secondary combustion is performed above the combustion chamber, and combustion exhaust gas in the combustion chamber A stoker-type incinerator configured to mix a recirculation gas extracted from a part of the air and air supplied through an air passage and supply the air mixed recirculation gas into the furnace through a recirculation passage by a fan In the combustion control apparatus, an air flow rate adjusting means for adjusting an air flow rate is provided in the air passage, while a temperature detection means for detecting the temperature of the air mixed recirculation gas and a gas concentration of the air mixed recirculation gas are detected. Gas concentration detection means, and a temperature detection value of the air mixture recirculation gas from the temperature detection means and a gas concentration detection value of the air mixture recirculation gas from the gas concentration detection means. Based on these temperature detection value and gas concentration detection value, the temperature of the air mixing recirculation gas becomes a preset target temperature, and the gas concentration of the air mixing recirculation gas is set in advance. A combustion control device for a stoker type incinerator characterized by comprising a combustion control means for calculating a passage area of the air flow rate adjusting means to control the air flow rate adjusting means to the calculated passage area value. .   After introducing primary air from below the stalker into which the incinerator is charged and performing primary combustion in the combustion chamber above the stalker, secondary combustion is performed above the combustion chamber, and combustion exhaust gas in the combustion chamber A stoker-type incinerator configured to mix a recirculation gas extracted from a part of the air and air supplied through an air passage and supply the air mixed recirculation gas into the furnace through a recirculation passage by a fan In this combustion control device, recirculation gas flow rate adjustment for adjusting the air mixture recirculation gas flow rate in a recirculation gas passage through which air is mixed with the recirculation gas and the air mixed recirculation gas supplied to the combustion chamber flows And a gas flow meter for detecting the flow rate of the air-mixed recirculation gas. The flow rate of the recirculation gas is preliminarily determined based on the detected flow rate of the recirculation gas input from the gas flow meter. Combustion control means is provided for calculating a passage area of the recirculation gas flow rate adjusting means so that a set target flow rate is obtained, and controlling the recirculation gas flow rate adjustment means to the passage area calculated value. Combustion control device for a stoker-type incinerator.   A plurality of recirculation gas outlets are provided at a plurality of locations in the combustion chamber, and a plurality of the recirculation gas passages are connected to the respective recirculation gas outlets. An air mixed recirculation gas flow rate is provided in each of the recirculation gas passages. Recirculation gas flow rate adjustment means for adjusting the combustion chamber pressure detection means for detecting the pressure of the combustion chamber is provided corresponding to the recirculation gas flow rate adjustment means, and the combustion control means includes the plurality of combustion chambers. Based on the combustion chamber pressure detection value from the chamber pressure detection means, calculate the passage area of each recirculation gas flow rate adjustment means such that the combustion chamber pressures at the plurality of locations become a preset target pressure, 6. The combustion control system for a stoker type incinerator according to claim 5, wherein each recirculation gas flow rate adjusting means is configured to control the passage area calculated value.

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