KR101139045B1 - Combustion control unit for stoker-fired combustion furnace - Google Patents

Abstract

In the combustion control apparatus of the stocker type incinerator, the present invention provides an air flow rate adjusting means (30a) for adjusting the air flow rate in the air passage (30), while the temperature detecting means for detecting the temperature of the air mixed recycle gas [ 35 (35a) and a temperature detection value of the air mixed recycle gas from the temperature detecting means 35 (35a) are input, and the temperature of the air mixed recycle gas is set to a predetermined target temperature based on the temperature detected value. The combustion control means 60 which calculates the passage area of the air flow volume adjustment means 36 and controls the flow volume adjustment means 36 to a passage area calculation value so that it may be provided.

Description

Combustion control device of stocker type incinerator {COMBUSTION CONTROL UNIT FOR STOKER-FIRED COMBUSTION FURNACE}

The present invention introduces primary air from below a stocker into which to-be-burned objects such as dust and industrial waste are introduced, performs primary combustion in the combustion chamber above the stocker, and then executes secondary combustion in the upper portion of the combustion chamber. A combustion control apparatus of a stocker type incinerator is provided.

The stocker type incinerator is provided with a stocker which alternately arranges the grate of the fixed stage and the movable stage, and performs stirring and advancement of the dust (burned material) introduced from the hopper by reciprocating the movable stage by a hydraulic device. The drying of the dust is carried out in the drying stand disposed upstream of the stocker, the main combustion is carried out while the primary air is introduced in the next main combustion station, and the residues remaining on the inger combustion table (post-combustion combustion station) at the downstream side are carried out. An incinerator configured to carry out inger combustion.

In such a stocker type incinerator, a technique in which a recycle gas obtained by extracting a part of the combustion exhaust gas in the combustion chamber on the stocker is returned to the secondary combustion unit in the combustion chamber through a recirculation passage to contribute to combustion together with the secondary air. It is provided by patent document 1 (Japanese Patent No. 3582710).

In the technique provided by Patent Document 1, a part of the combustion exhaust gas in the combustion chamber above the stocker is extracted and supplied to the heat exchanger as a recycle gas, and the recycle gas, the primary air and the secondary air are supplied to the heat exchanger. It heat-exchanges to preheat the primary air and secondary air, and simultaneously cools the recirculation gas, and the lowered recirculation gas is cooled by a fan disposed on the downstream side of the heat exchanger than the secondary air supply port in the combustion chamber. Also, it is put in the upstream side, the atmosphere upstream than the secondary air supply port is made into a weakly reducing atmosphere, the total air ratio in the combustion chamber after the secondary air supply is suppressed to about 1.3, and unburned gas and unburned matter are completely burned. At the same time, NOx is reduced.

[Patent Document 1] Japanese Patent No. 3582710

However, the above-mentioned prior art of patent document 1 has the following problems.

That is, in the above prior art, a part of the combustion exhaust gas in the combustion chamber above the stocker is extracted and sent to the heat exchanger as a recycle gas, and the heat exchanger cools the recycle gas by heat exchange with the primary air and the secondary air. The recycled gas is introduced into the upstream portion of the combustion chamber by the fan disposed on the downstream side of the heat exchanger, so that the recycled gas is air (primary air and secondary). A heat exchanger for exchanging heat with air) and then sending it down to the fan is required, and the structure of the combustion exhaust gas recirculation system is complicated, and the number of devices is increased, resulting in an increase in the apparatus cost.

In addition, although the temperature of the fan is lowered by the heat exchanger, since the combustion exhaust gas containing a large amount of corrosion components is left as it is, the corrosion of the fan is likely to proceed, resulting in deterioration of the durability and life of the fan.

In order to solve the above problems of the prior art, the inventors of the present invention have provided the invention of Japanese Patent Application No. 2005-059846 (filed March 4, 2005).

In such a source invention, when a part of the combustion exhaust gas extracted in the combustion chamber above a stocker is refluxed by a fan in a combustion chamber through a recirculation path, it is used for a combustion gas in the upstream part of the fan of the said recirculation path. Combustion air by directly mixing air formed by any one of primary air and secondary air of the gas, introduced into a recirculating gas reflux fan, and refluxing the recirculated gas comprising the mixed gas into the combustion chamber by the fan. It is possible to dilute the combustion exhaust gas by mixing with the air and introduce it into the fan by mixing with the air, whereby a heat exchanger for cooling and lowering the recirculating gas as in the prior art is unnecessary. To simplify the structure of the combustion exhaust gas recirculation system and to reduce the number of components, And it may reduce the device costs of each plant.

In addition, in such a source invention, the recycle gas introduced into the recirculating gas reflux fan is cooled by the low-temperature air to be cooled down and further diluted by the air to lower the combustion exhaust gas concentration, and furthermore, by the cooling. Since the salt, which is a corrosion component in the exhaust gas, is solidified to become a recycle gas having a reduced corrosion component, the temperature of the fan decreases, the thermal stress of the fan decreases, and a recycle gas having a reduced corrosion component as described above is produced. By introducing into the fan, corrosion of the fan can be suppressed, whereby a fan can be obtained at a low cost without using expensive heat-resistant materials, thereby maintaining required durability and lifespan.

However, in the above-mentioned source invention, the mixing method of the recycle gas and the air (primary air and secondary air for combustion) and the reflux method to the incinerator side in the stocker type incinerator, and the reflux to such a mixture and the incinerator side Regarding the proposed apparatus for implementation, control of specific mixing ratio of recycle gas and air returned to the incinerator side, combustion control in an incinerator by reflux of air mixed recycle gas, and the like are not disclosed in the above-mentioned source invention. not.

The present invention has been made in view of such a situation, and an object thereof is to make it possible to carry out the control of the mixing ratio of the air mixed recycle gas returned to the incinerator side and the combustion control in the incinerator with high accuracy through a recirculation passage having a recirculation fan, A relatively simple and inexpensive configuration provides a combustion control device of a stocker type incinerator capable of complete combustion at high combustion efficiency while suppressing generation of harmful components such as NOx and CO.

In order to solve the problems of the prior art, the invention of claim 1 according to the present invention, after introducing the primary air from the lower side of the stocker to which the incineration object is introduced, after performing the primary combustion in the combustion chamber above the stocker The secondary combustion is performed above the combustion chamber, the recycle gas from which a part of the combustion exhaust gas in the combustion chamber is extracted, and the air supplied through the air passage are mixed, and the air mixed recycle gas is recycled by a fan. A combustion control apparatus of a stocker type incinerator configured to be supplied into a furnace through a passage, comprising: an air flow rate adjusting means for adjusting an air flow rate in the air passage, and a temperature detecting means for detecting a temperature of the air mixed recycle gas; And a temperature detection value of the air mixed recycle gas from the temperature detection means is input, A combustion control means for calculating the passage area of the air flow rate adjusting means based on the temperature detection value so that the temperature of the air mixed recycle gas is at a predetermined target temperature, and controlling the air flow rate adjusting means to the passage area calculated value; I am preparing.

Moreover, the invention of Claim 2 in this invention WHEREIN: In the said combustion control apparatus, while providing the air flow volume adjusting means which adjusts the air flow volume in the said air path, the gas which detects the gas concentration of the said air mixed recycle gas. A concentration detection means and a gas concentration detection value of the air mixed recycle gas from the gas concentration detection means are input so that the gas concentration of the air mixed recycle gas is a predetermined target gas concentration based on the gas concentration detected value. Combustion control means for calculating the passage area of the air flow rate adjusting means and controlling the air flow rate adjusting means to the passage area calculated value is provided.

In addition to the invention of claim 2, the invention of claim 3 provides a NOx concentration detection means for detecting NOx concentration in the combustion exhaust gas and a CO concentration detection means for detecting CO concentration in the combustion exhaust gas. The combustion control means detects the NOx concentration input from the NOx concentration detection means, and the gas concentration of the air mixed recycle gas is a predetermined target gas concentration based on the gas concentration detection value input from the gas concentration detection means. The target CO whose concentration of CO in the combustion exhaust gas is preset based on the CO concentration detection value input from the CO concentration detecting means while the NOx concentration in the combustion exhaust gas becomes equal to or less than the predetermined target NOx concentration based on the value. The passage area of the air flow rate adjusting means is calculated to be equal to or lower than the concentration, and the air flow rate adjusting means is It is preferable to be comprised so that it may control by the said passage area calculated value.

Moreover, the invention of Claim 4 in this invention WHEREIN: In the said combustion control apparatus, while providing the air flow volume adjusting means which adjusts the air flow volume in the said air path, the temperature detection which detects the temperature of the said air mixed recycle gas. Means, gas concentration detecting means for detecting a gas concentration of the air mixed recycle gas, a temperature detected value of the air mixed recycle gas from the temperature detecting means, and a gas of the air mixed recycle gas from the gas concentration detecting means The concentration detection value is input, and based on these temperature detection value and the gas concentration detection value, the temperature of the air mixed recycle gas becomes a preset target temperature, and the gas concentration of the air mixed recycle gas is preset gas concentration. The passage area of the air flow rate adjusting means is calculated so that Combustion control means for controlling the amount adjustment means to the passage area calculated value is provided.

In addition, in the combustion control apparatus according to the fifth aspect of the present invention, in the combustion control apparatus, an air mixed recycle gas flow rate is supplied to a recycle gas passage through which an air mixed recycle gas supplied to the combustion chamber is mixed with air. A recirculating gas flow rate adjusting means for adjusting is provided, and a gas flow meter for detecting the flow rate of the air mixed recirculating gas is provided, and the flow rate of the recirculating gas is based on the flow rate detection value of the recirculating gas input from the gas flow meter. Combustion control means for calculating the passage area of the recirculating gas flow rate adjusting means so as to be a predetermined target flow rate and controlling the recirculating gas flow rate adjusting means to the passage area calculated value is provided.

In addition to the invention of claim 5, the invention of claim 6 provides a plurality of recirculating gas outlets in a plurality of locations of the combustion chamber, and provides a plurality of the recirculating gas passages by connecting to each of the recirculating gas outlets. A recirculating gas flow rate adjusting means for adjusting an air mixture recirculating gas flow rate in the air, and providing the combustion chamber pressure detecting means for detecting the pressure in the combustion chamber in correspondence with the recirculating gas flow rate adjusting means, and the combustion control means On the basis of the combustion chamber pressure detection values from the two combustion chamber pressure detecting means, a passage area of each of the recirculating gas flow rate adjusting means is calculated so that the plurality of combustion chamber pressures become a predetermined target pressure, and the recirculating gas flow rate adjusting means To control the passage area calculation value It is preferable that it is done.

Effects of the Invention

In the invention of claim 1, the temperature of the air mixed recycle gas is equal to or less than a predetermined allowable maximum temperature based on a temperature detection value of the air mixed recycle gas introduced into the recycle fan that conveys the air mixed recycle gas by the combustion control means. Since the amount of air mixed in the air mixed recycle gas is controlled by adjusting the opening degree of the air flow rate adjusting means so that the air flow rate is increased, the air amount is increased in response to the temperature rise even when the temperature of the recycle gas increases for any reason. The temperature of the air mixed recycle gas sucked into the recirculation fan can be properly held below the allowable maximum temperature at all times.

Thereby, overheating of the recirculation fan by the said air mixed recycle gas can be prevented, and it is not necessary to use the expensive fan which consists of a special heat resistant material for the said recirculation fan, and can maintain high durability.

In the invention of claim 2, the gas concentration of the air mixed recycle gas is previously determined based on a gas concentration detected value (preferably an oxygen concentration detected value) of the air mixed recycle gas introduced into the recycle fan by the combustion control means. Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the opening degree (passage area) of the air flow rate adjusting means so as to be the set allowable gas concentration, for example, oxygen in the recycle gas is consumed and the oxygen concentration becomes too small. Even in this case, by increasing the air amount by increasing the opening degree of the air flow rate adjusting means, stable combustion at or above the allowable minimum oxygen concentration is always possible.

Moreover, when comprised in the invention of Claim 3, since the opening degree of the air flow adjusting means is adjusted by the combustion control means, the NOx concentration in combustion exhaust gas is below the permissible maximum NOx concentration, and in combustion exhaust gas, The CO concentration can be held at all times below the allowable maximum CO concentration, respectively, to promote the purification of the exhaust gas.

According to invention of Claim 4, the synergistic effect of invention of Claim 1 and invention of Claim 2 is acquired.

That is, in the invention of claim 4,

(1) the opening degree of the air flow rate adjusting means such that the temperature of the air mixed recycle gas is equal to or less than a predetermined allowable maximum temperature based on a temperature detection value of the air mixed recycle gas introduced into the recycle fan by the combustion control means. Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the temperature of the recycled gas, even if the temperature of the recycled gas is raised for any reason, the air sucked into the recycle fan is increased by increasing the amount of air in response to the temperature rise. The temperature of the mixed recycle gas can be properly held below the allowable maximum temperature at all times.

Thereby, overheating of the recirculation fan by the said air mixed recycle gas can be prevented, and it is not necessary to use the expensive fan which consists of a special heat resistant material for the said recirculation fan, and can maintain high durability.

(2) The allowable gas in which the gas concentration of the air mixed recycle gas is preset based on the gas concentration detected value (preferably the oxygen concentration detected value) of the air mixed recycle gas introduced into the recycle fan by the combustion control means. Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the opening degree of the air flow rate adjusting means so as to be a concentration, the air flow rate even when oxygen in the recycle gas is consumed and the oxygen concentration becomes too small, for example. By increasing the air amount by increasing the opening degree of the adjusting means, stable combustion at or above the allowable minimum oxygen concentration is always possible.

In the invention of claim 5, the recirculating gas flow rate adjusting means for adjusting the air mixing recirculating gas flow rate is provided in an intake passage (recirculating gas passage) through which the air mixed recirculating gas flows, and the flow rate of the air mixed recirculating gas is detected. The recirculating gas flow rate adjusting means is controlled so that the flow rate of the recirculating gas is a predetermined target flow rate based on the flow rate detection value of the recirculating gas from the gas flow meter. By controlling the degree of opening, the amount of air mixed recycle gas as secondary air can be stably held to an amount that the air mixed recycle gas can completely burn, and the combustion state can be averaged to ensure stable combustion. .

According to the sixth aspect of the present invention, a recirculating gas jet port is provided at a plurality of places in the combustion chamber, and a combustion chamber pressure detection means is provided corresponding to the recirculating gas flow rate adjusting means provided in each recirculating gas passage connecting to the recirculating gas jet port. The combustion control means detects the recycle gas pressure near the recycle gas outlet and controls the recycle gas pressure to be the target gas pressure by using the relationship that the recycle gas amount is proportional to the recycle gas pressure. It is possible to freely adjust the distribution of the air mixing recycle gas amount to the recirculating gas jet ports provided in a plurality of places, and to uniformly supply the air mixing recirculation gas in the circumferential direction of the combustion chamber, so that combustion can be averaged.

1 is a block diagram showing a stocker type incinerator according to a first embodiment of the present invention;

2 is a schematic configuration diagram showing a combustion control means in the first embodiment;

3 is a combustion control block diagram according to the first embodiment;

4 is a configuration diagram showing a stocker type incinerator according to a second embodiment of the present invention;

5 is a schematic configuration diagram showing combustion control means in the second embodiment;

6 is a combustion control block diagram according to the second embodiment;

7 is a configuration diagram showing a stocker type incinerator according to a third embodiment of the present invention;

8 is a combustion control flowchart in the third embodiment;

9 is a configuration diagram showing a stocker type incinerator according to a fourth embodiment of the present invention;

10 is a combustion control flowchart in the fourth embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on embodiment of illustration.

[First embodiment]

1 is a configuration diagram of a stocker type incinerator according to a first embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a combustion control means in the first embodiment, and FIG. 3 is in the first embodiment. Is a combustion control block diagram.

In Fig. 1, reference numeral 1 denotes a dust hopper into which to-be-fired objects such as dust and industrial waste are put, and reference numeral 2 denotes a stocker type incinerator. This stocker type incinerator 2 mainly comprises a drying table stocker 21 which mainly constitutes a drying table at the bottom of the furnace in the inlet from the dust hopper 1, a main combustion platform stocker 22 which mainly comprises a combustion table, and mainly an ingot. An inger combustion zone stocker 23 constituting the combustion zone is provided. The drying table stocker 21 is located at the most upstream side, the main combustion bench stocker 22 is located downstream of the drying table stocker 21, and the ingot combustion table stocker 23 is downstream of the main combustion bench stocker 22 at the downstream side. It is located. Here, the main combustion zone refers to a burning area on the dust layer by raising a flame.

Each of the stockers 21, 22, and 23 includes a moving grate disposed between the fixed grates, and injects dust (burned material) by the reciprocating motion of the moving grate, and then removes the dust from the stocker 21. It is to dry, to perform main combustion in the stocker 22, and to carry out Inger combustion in the stocker 23 last. In addition, although this main combustion zone stocker 22 is three in this embodiment, just one or more may be provided. Reference numeral 8 is a recollection tank.

Moreover, the primary combustion chamber 3 is provided above the stockers 21, 22, and 23, and the secondary combustion chamber 4 is provided above it.

Reference numerals 19a, 19b, 19c, and 19d denote recirculation gas ejection nozzles provided to face the secondary combustion chamber 4. Reference numeral 81 denotes a boiler connected to the exhaust gas outlet of the secondary combustion chamber 4.

The drying table stocker 21, the combustion table stocker 22, and the ingot combustion table stocker 23 are provided with primary air pipes 51, 52 (3) and 53 openings in the lower wind boxes, respectively. It is comprised so that primary air may be supplied from a primary air line. Reference numeral 6 denotes a fan for primary air supply, and reference numeral 5 denotes a primary air main pipe connecting the fan 6 and each of the primary air pipes 51, 52 (three) and 53. The main air, which is pumped from the fan 6, is distributed from the primary air main pipe 5 to the primary air pipes 51, 52, 53. The primary air pipes 51, 52, 53 are provided with opening / closing dampers 54, 55, 56 which open and close them, respectively. Moreover, the primary air main pipe 5 is provided with the opening-closing damper 7 which opens and closes this.

Reference numeral 40 denotes a recycle gas outlet for extracting a part of the combustion exhaust gas in the primary combustion chamber 3 (may be inside the secondary combustion chamber 4) as recycle gas, and the recycle gas outlet 40 The recycled gas discharged from X) is introduced into the intake passage 31 of the recycle fan 13 through the recycle passage 16, the mixed gas passage 14, and the cyclone 12 that separates the solid foreign matter in the mixed gas. have. 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 for opening and closing the inlet of the recirculation fan 13. have.

Reference numeral 30 denotes an entrained air passage branched from the primary air main pipe 5 and connected to an intake passage 31 which is an upstream portion of the recirculation fan 13, and reference numeral 30a denotes an entrained air passage 30. It is an air damper (opening / closing damper) which opens and closes the opening, and when the air damper 30a is opened, the primary air from the primary air main pipe 5 passes through the mixing air passage 30 and the recirculation fan of the suction passage 31. (13) is introduced into the inlet, the primary air is mixed with the recycle gas, and introduced into the recycle fan 13 via the mixed gas passage 14, the cyclone 12 and the suction passage 31.

The air damper 30a is configured to automatically adjust the opening degree (flow rate adjustment) by receiving a control signal from the fuel control means 60 to be described later, and by adjusting the opening degree of the air damper 30a. The flow rate of the primary air flowing through the mixed air passage 30 is adjusted, and the recycle gas and the primary introduced into the recycle fan 13 via the mixed gas passage 14, the cyclone 12, and the suction passage 31. It is comprised so that the mixing ratio of the recycle gas of the air mixed recycle gas which is the mixed gas of air, and primary air may be adjusted.

Then, the air mixed recycle gas after the primary air mixing, which is pressurized by the recirculation fan 13 to the recirculation passage 15, branches into two recirculation passages 17 and 18, one side from the recirculation passage 17 on one side. To the two rows of recirculating gas jet nozzles 19a and 19c, and to the other side of the recirculating gas jet nozzles 19b and 19d to the other row of recirculating gas jet nozzles 19b and 19d. , 19c, 19b, and 19d can be ejected into the secondary combustion chamber 4. In addition, the branch gas damper B 33 which opens and closes this is provided in the recirculation path 17, and the branch gas damper A 32 which opens and closes this is provided in the recirculation path 18.

Reference numeral 35 is a temperature sensor provided in the recirculation passage 15 to detect the temperature of the air mixed recirculation gas (the temperature sensor 35a may be provided in the mixed gas passage 14). The following description is given for the temperature sensor 35]. Reference numeral 36 is an air damper opening degree detector for detecting the opening degree of the air damper 30a.

The stocker type incinerator 2 of the first embodiment of the present invention includes a combustion control means 60, and the combustion control means 60 includes a temperature sensor 35 (including 35a) and an air damper 30a. And an air damper opening degree detector 36, which is electrically connected to the air damper opening degree detector 36, and inputs a temperature detection value of the air mixed recycle gas from the temperature sensor 35, and from the air damper opening degree detector 36 to the air damper 30a. The opening degree detection value of is inputted, and the opening degree of the air damper 30a is adjusted so that the temperature of the said air mixed recycle gas may become a target temperature based on this detected value, and the recycle gas in the said air mixed recycle gas is adjusted. And the mixing ratio of primary air to the target mixing ratio.

In the operation of the stocker type incinerator 2, a part of the combustion exhaust gas extracted from the combustion chamber (primary combustion chamber 3 or the secondary combustion chamber 4) above the stocker through the recycle gas outlet 40. Is mixed with the primary air from the entrained air passage 30 through the recycle passage 16 and recycle gas through the mixed gas passage 14, the cyclone 12 and the suction passage 31. 13).

Then, the air-mixed recycle gas after the primary air mixture, which is pressurized by the recycle fan 13 to the recycle passage 15, branches into the two recycle passages 17 and 18, and recycle gas ejection nozzles 19a and 19c on one side. ) And the recirculating gas jet nozzles 19b, 19d on the other side, respectively, and may be jetted into the secondary combustion chamber 4 from the recirculating gas jet nozzles 19a, 19c, 19b, 19d.

By doing in this way, it is possible to cool down the recycle gas which consists of a part of combustion exhaust gas with primary air, and to dilute combustion exhaust gas by mixing of the said primary air, and to introduce it into the recycling fan 13.

Next, based on FIG.2 and FIG.3, the combustion control means and combustion control procedure in this 1st Embodiment are demonstrated.

The combustion control means 60 of this embodiment includes the gas temperature comparison part 61, the reference gas temperature setting part 62, the gas temperature / air amount setting part 63, the air amount adjustment amount calculation part 64, and the air damper opening. The degree adjustment amount calculation part 65 and the air damper opening degree calculation part 66 are provided, The temperature detection value of the air mixed recycle gas detected by the temperature sensor 35 is the gas of the said combustion control means 60. It is input to the temperature comparison part 61. In the reference gas temperature setting unit 62, an allowable maximum temperature (about 300 ° C. is appropriate) of the air mixed recycle gas sent to the recirculation fan 13 is set.

In the gas temperature comparison unit 61, a temperature deviation between the temperature detection value of the air mixed recycle gas from the temperature sensor 35 and the allowable maximum temperature set in the reference gas temperature setting unit 62 is calculated. .

And the opening degree of the air damper 30a by the air damper opening degree calculation means 600 shown in FIG. 2 is calculated by the following procedures.

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 has a relationship between the air amount of the air supplied through the mixed air passage 30 and the air mixed recycle gas temperature after mixing of the air with the recycle gas from the recycle passage 16. It is preset by experimental results or simulation calculations.

In addition, in the air amount adjustment amount calculation unit 64, the air amount deviation corresponding to the calculated value of the temperature deviation from the gas temperature comparison unit 61 is calculated (extracted) from the gas temperature / air amount setting unit 63. And output to the air damper opening degree adjustment amount calculation unit 65. In the air damper opening degree adjustment amount calculation section 65, a relationship between the air amount and the air damper opening degree is set as the opening degree characteristic of the air damper 30a, and the air damper opening degree adjustment amount calculation section 65 is set. In the above, the air damper opening degree adjustment amount corresponding to the air amount deviation calculated value from the air amount adjustment amount calculation unit 64 is calculated and input to the air damper opening degree calculation unit 66.

In this air damper opening degree calculation part 66, the air damper opening degree adjustment amount calculation part 65 responds to the opening degree detection value of the air damper 30a input from the said air damper opening degree detector 36. The air damper 30a is controlled to the target opening degree by adding or subtracting an air damper opening degree adjustment amount of the air damper and calculating an air damper opening degree corresponding to the target value of the air damper opening degree, that is, the reference gas temperature. have.

Thus, in the combustion control apparatus of the stocker type incinerator 2 which concerns on 1st Embodiment, the said air is controlled by the combustion control means 60 based on the temperature detection value of the air mixed recycle gas which passes through the said recycle fan 13. Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the opening degree of the air damper 30a so that the temperature of the mixed recycle gas is equal to or less than a predetermined allowable maximum temperature, the temperature of the recycle gas is raised for some reason. Even if the amount of air is increased in response to the temperature rise, the temperature of the air mixed recycle gas sucked into the recirculation fan 13 can always be properly held below the allowable maximum temperature.

This prevents overheating of the recirculation fan 13 by the air mixed recirculation gas, and eliminates the need to use a high-cost fan made of a special heat-resistant material for the recirculation fan 13 and maintains high durability. can do.

Second Embodiment

FIG. 4 is a configuration diagram of a stocker type incinerator according to a second embodiment of the present invention, FIG. 5 is a schematic configuration diagram of a combustion control means in the second embodiment, and FIG. 6 is in the second embodiment. Is a combustion control block diagram.

In the second embodiment of the present invention, in the means for detecting the gas concentration of the air mixed recycle gas and controlling the opening degree of the air damper 30a by the gas concentration, the oxygen concentration is used as the gas concentration. It is also possible to use the concentration of other components in the air mixed recycle gas such as CO ₂ instead of the above oxygen concentration.

That is, in the stocker type incinerator 2 of 2nd Embodiment of this invention, as shown in FIG. 4, the oxygen concentration meter 37 (or oxygen concentration meter 37a) which detects the oxygen concentration in an air mixed recycle gas. And a NOx concentration sensor 38 for detecting NOx concentration in the combustion exhaust gas on the outlet side of the secondary combustion chamber 4 and a CO concentration sensor 39 for detecting the CO concentration.

And the combustion control means 60 of this embodiment is the oxygen concentration comparison part 71, the reference oxygen concentration setting part 72, the NOx concentration comparison part 73, as shown to FIG. 5 and FIG. Reference NOx concentration setting unit 74, 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 calculating unit 81, CO concentration / air amount setting unit 82, air damper opening degree adjustment amount calculating unit 65 and air damper opening degree calculation A part 66 is provided, and the opening degree of the air damper 30a is calculated so that the oxygen concentration of the air mixed recycle gas becomes a predetermined target oxygen concentration based on the oxygen concentration detection value from the oxygen concentration meter 37. The opening degree of the air damper 30a is controlled by the opening degree calculated value.

In addition, the combustion control means 60 determines that the NOx concentration in the combustion exhaust gas is preset 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. The opening degree of the air damper 30a is calculated so that it becomes below the target NOx concentration and the CO concentration in the combustion exhaust gas is below the predetermined target CO concentration, and the opening degree of the air damper 30a is calculated as the opening degree calculation value. Controlled.

Next, based on FIG. 5 and FIG. 6, the combustion control means and the combustion control procedure in 2nd Embodiment of this invention are demonstrated.

FIG. 5 shows the opening degree of the air damper 30a by the air damper opening degree calculation means 600 based on the oxygen concentration detection value from the oxygen concentration meter 37 (37a) in this second embodiment. Although the calculation procedure is extracted and shown, the following operation description is performed with reference to FIG. 6 about combustion control using the NOx concentration and CO concentration in combustion exhaust gas in addition to the said oxygen concentration.

In FIG. 6, the oxygen concentration detection value of the air mixed recycle gas detected by the oxygen concentration meter 37 (or the oxygen concentration meter 37a) is input to the oxygen concentration comparison unit 71 of the combustion control means 60. The NOx concentration detection 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. The CO concentration detection 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, the allowable minimum oxygen concentration of the air mixed recycle gas sent to the recycle fan 13 is set. In the reference NOx concentration setting unit 74, the 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.

In the oxygen concentration comparison unit 71, the oxygen concentration detection value in the air mixed recycle gas from the oxygen concentration meter 37 and the oxygen concentration deviation of the allowable minimum oxygen concentration set in the reference oxygen concentration setting unit 72 are calculated. And input to the air amount adjustment amount calculation unit 77.

In the NOx concentration comparison unit 73, the NOx concentration deviation between the NOx concentration detection value 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 is determined. Is calculated and input to the air amount adjustment amount calculation unit 79.

In the CO concentration comparison unit 75, the CO concentration deviation value of the CO concentration detection 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 are determined. It calculates and inputs into the air amount adjustment amount calculation part 81. As shown in FIG.

In the oxygen concentration / air amount setting unit 78, the air amount of the air supplied through the entrained air passage 30 and the air mixed recycle gas after mixing the air with the recycle gas from the recycle passage 16. The relationship of the oxygen concentration of is preset by the experimental result or the simulation calculation.

In addition, in the NOx concentration / air amount setting unit 80, the relationship between the air amount of air supplied through the mixed air passage 30 and the NOx concentration in the combustion exhaust gas is preset by an experimental result or a simulation calculation. .

In addition, 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 experiment results or simulation calculation. .

In the air amount adjustment amount calculating section 77, the air amount deviation corresponding to the calculated value of the oxygen concentration deviation from the oxygen concentration comparing unit 71 is calculated (extracted) from the oxygen concentration / air amount setting unit 78 And input to the air damper opening degree adjustment amount calculation unit 65.

Further, in the air amount adjustment amount calculation unit 79, the air amount deviation corresponding to the calculated value of the NOx concentration deviation from the NOx concentration comparison unit 73 is calculated (extracted) from the NOx concentration / air amount setting unit 80 And input to the air damper opening degree adjustment amount calculation unit 65.

In addition, in the air amount adjustment amount calculation unit 81, the air amount deviation corresponding to the calculated value of the CO concentration deviation from the CO concentration comparison unit 75 is calculated (extracted) from the CO concentration / air amount setting unit 82 And input to the air damper opening degree adjustment amount calculation unit 65.

In the air damper opening degree adjustment amount calculation section 65, a relationship between the air amount and the air damper opening degree is set as the opening degree characteristic of the air damper 30a, and the air damper opening degree adjustment amount calculation section 65 is set. In the present invention, the air damper opening degree adjustment amount based on the air amount deviation corresponding to the oxygen concentration deviation, the air damper opening degree adjustment amount based on the air amount deviation corresponding to the NOx concentration deviation, and the air amount corresponding to the CO concentration deviation The air damper opening degree adjustment amount based on the deviation is calculated sequentially, and the optimum air damper opening degree adjustment amount is selected from the said air damper opening degree adjustment amount, and it is made to input into the air damper opening degree calculation part 66. .

And in the air damper opening degree calculation part 66, the air damper opening degree adjustment amount calculation part 65 is made into the opening degree detection value of the air damper 30a input from the air damper opening degree detector 36. The air damper opening degree adjustment amount is added or subtracted to calculate a target value of the air damper opening degree, that is, the opening degree of the air damper 30a adapted to the reference oxygen concentration or the reference NOx concentration or the reference CO concentration. Air damper 30a is controlled to the target opening degree.

Other configurations are the same as those in the first embodiment, and the same members are denoted by the same reference numerals.

Thus, in the combustion control apparatus of the stocker type incinerator 2 which concerns on 2nd Embodiment, based on the oxygen concentration detection value of the air mixed recycle gas introduced into the said recycling fan 13 by the combustion control means 60, Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the opening degree of the air damper 30a so that the oxygen concentration of the air mixed recycle gas is equal to or greater than a predetermined allowable minimum oxygen concentration, the oxygen in the recycle gas is consumed. Even when the oxygen concentration becomes too small, stable combustion is possible at all times above the allowable minimum oxygen concentration by increasing the air amount by increasing the opening degree of the air damper 30a.

In addition, 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 below the maximum allowable NOx concentration, and the CO concentration in the combustion exhaust gas is allowed. It can always hold | maintain below concentration, and it can promote purification | purification of exhaust gas.

[Third embodiment]

FIG. 7 is a configuration diagram of a stocker type incinerator according to a third embodiment of the present invention, and FIG. 8 is a flowchart showing the combustion control based on the oxygen concentration and the temperature of the air mixed recycle gas in the third embodiment.

The third embodiment of the present invention combines the first embodiment shown in FIGS. 1 to 3 and the second embodiment shown in FIGS. 4 to 6.

That is, in this 3rd Embodiment, the combustion control means 60 is used for the temperature detection value of the air-mixed recycle gas by the temperature sensor 35a (or the temperature sensor 35 in FIG. 1). On the basis of this, by adjusting the opening degree of the air damper 30a so that the temperature of the air mixed recycle gas is equal to or less than a predetermined allowable maximum temperature, the amount of air mixed into the air mixed recycle gas is controlled, and the air mixed recycle gas is The opening degree of the air damper 30a is calculated so that the oxygen concentration of the air mixed recycle gas is equal to or greater than a predetermined allowable minimum oxygen concentration based on the oxygen concentration detection value by the oxygen concentration meter 37 which detects the oxygen concentration of The opening degree of the air damper 30a is controlled by the said opening degree calculated value.

In the third embodiment, similarly to the second embodiment, the NOx concentration sensor 38 for detecting the NOx concentration in the combustion exhaust gas on the outlet side of the secondary combustion chamber 4 and the CO concentration are detected. The CO concentration sensor 39 is provided, and the NOx concentration in the combustion exhaust gas is preliminarily 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. The degree of opening of the air damper 30a is calculated so as to be equal to or less than the set target NOx concentration, and also to allow the CO concentration in the combustion exhaust gas to be equal to or less than the predetermined target CO concentration, thereby opening the opening degree of the air damper 30a. Also controlled by the calculated value.

Other configurations are the same as those in the first embodiment, and the same members are denoted by the same reference numerals.

Fig. 8 shows a flow chart of extracting the combustion control by the oxygen concentration and the temperature of the air mixed recycle gas in the third embodiment, and the combustion control is executed in the following order.

That is, the oxygen concentration Cg of the air mixed recycle gas is detected by the oxygen concentration meter 37 (step (1)), and this oxygen concentration detection value Cg is compared with the target oxygen concentration Cgo [step ( 2)] If the oxygen concentration Cg is larger than the target oxygen concentration Cgo (Cg> Cgo), the air damper 30a is closed to reduce the air amount (step (3)), and the oxygen concentration Cg is When smaller than the target oxygen concentration Cgo (Cg <Cgo), the air damper 30a is opened to increase the amount of air (step (4)).

Subsequent to the control of the opening degree of the air damper 30a by such oxygen concentration, the control of the opening degree of the air damper 30a by the temperature of the air mixed recycle gas is performed in the following order.

That is, in FIG. 8, the temperature Tg of the air mixed recycle gas is detected by the temperature sensor 35a (or the temperature sensor 35 in FIG. 1) (step (5)). The detection value Tg is compared with the target temperature Tgo (step (6)), and when the temperature detection value Tg coincides with the target temperature Tgo, the opening degree of the air damper 30a is regarded as a phenomenon. When the temperature detected value Tg is higher than the target temperature Tgo (Tg> Tgo), the air damper 30a is opened to increase the air amount, and the temperature Tg of the air mixed recycle gas is lowered (step ( 7)], when the temperature detection value Tg is lower than the target temperature Tgo (Tg < Tgo), the air damper 30a is closed to reduce the air volume and raise the temperature Tg of the air mixed recycle gas [ Step (8)].

According to 3rd Embodiment of this invention, the synergistic effect of the said 1st Embodiment and 2nd Embodiment is acquired.

That is, in the combustion control apparatus of the stocker type incinerator 2 according to the third embodiment,

(1) By the combustion control means 60, based on the temperature detection value of the air mixed recycle gas introduced into the recycle fan 13, the air damper so that the temperature of the air mixed recycle gas is equal to or less than a predetermined allowable maximum temperature. Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the opening degree of the 30a, even if the temperature of the recycle gas is raised for any reason, the amount of air is increased in response to the temperature increase, whereby the recycle fan ( The temperature of the air mixed recycle gas sucked into 13) can be properly held below the allowable maximum temperature at all times.

This prevents overheating of the recirculation fan 13 by the air mixed recirculation gas, and eliminates the need for using a high-cost fan made of a special heat-resistant material for the recirculation fan 13, and maintains high durability. Can be.

(2) By the combustion control means 60, based on the detected oxygen concentration of the air mixed recycle gas introduced into the recycle fan 13, the oxygen concentration of the air mixed recycle gas is equal to or greater than a predetermined allowable minimum oxygen concentration. Since the amount of air mixed into the air mixed recycle gas is controlled by adjusting the opening degree of the air damper 30a so that the air damper 30a is opened even when oxygen in the recycle gas is consumed and the oxygen concentration becomes too small. By increasing the amount of air by increasing the degree, stable combustion at or above the allowable minimum oxygen concentration is always possible.

In addition, 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 allowed to be below the maximum allowable NOx concentration and the CO concentration in the combustion exhaust gas is allowed. It can always hold | maintain below the maximum CO concentration, and can promote purification | purification of exhaust gas.

[Fourth Embodiment]

9 is a configuration diagram of a stocker type incinerator according to a 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 (recycle gas passage) through which air mixed recycle gas supplied to the secondary combustion chamber 4 by mixing air to the recycle gas and passing through ( 31 is provided with a gas damper 013 for adjusting the flow rate of the recirculating air mixture, and the flow rate of the air mixed recirculating gas is detected by the mixed gas flowmeter 90 provided in the recirculation passage 15, and the combustion control means ( 60), the opening degree of the gas damper 013 is controlled such that the flow rate of the recycle gas is a predetermined target flow rate based on the flow rate detection value of the air mixed recycle 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. 8.

In FIG. 10, the combustion control means 60 compares the detected flow rate Qg of the air mixed recycle gas from the mixed gas flowmeter 90 with the predetermined target flow rate Qgo (step (9)). ]. When the flow rate detection value Qg is larger than the target flow rate Qgo (Qg> Qgo), the gas damper 013 is closed (strictly opening is made small) (step (10)), and the flow rate detection When the value Qg is smaller than the target flow rate Qgo (Qg <Qgo), the gas damper 013 is opened (strictly increasing the opening degree) (step (11)), and the air mixed recycle gas is The flow rate is controlled to be the target flow rate.

Accordingly, by controlling the opening degree of the gas damper 013 so that the flow rate Qg of the recycle gas becomes the target flow rate Qgo, the air mixed recycle gas can completely burn the amount of the air mixed recycle gas as the secondary air. It becomes possible to hold stably in the quantity which exists, and can hold | maintain stable combustion by averaging a combustion state.

In the fourth embodiment of the present invention, the recirculating gas jet nozzles 19a and 19c and the recirculating gas jet nozzles 19b and 19d are provided in plural positions on the left and right sides of the secondary combustion chamber 4, and these are provided. Branch gas damper B 33 and branch gas for adjusting the flow rate of the air mixed recycle gas in each of the recirculating gas passages 17 and 18 connected to the recirculating gas jet nozzles 19a and 19c and the recirculating gas jet nozzles 19b and 19d. The damper A 32 is provided, and these pressures (in the vicinity of the recirculating gas jet nozzles 19a and 19c and the recirculating gas jet nozzles 19b and 19d in the secondary combustion chamber 4) are described below. The gas pressure sensor B42 and the gas pressure sensor A41 which detect "recirculation gas pressure" are provided.

In this fourth embodiment, the gas pressure sensor B42 and the gas pressure provided by the combustion control means 60 to face the plurality of left and right locations (two left and two right) of the secondary combustion chamber 4. Based on the detection value of the said gas pressure from the sensor A41, the opening degree of each branch gas damper B 33 and the branch gas damper A 32 is computed so that the said several gas pressure may become a preset target pressure. Therefore, it is comprised so that it may control by the opening degree calculated value of each branch gas damper B 33 and the branch gas damper A 32. FIG.

That is, in FIG. 10, by the combustion control means 60, the gas pressure detection value Pg by the gas pressure sensor B42 and the gas pressure sensor A41 is compared with the predetermined target gas pressure Pgo. (Step 12 of FIG. 10). When the gas pressure detection value Pg is larger than the target gas pressure Pgo (Pg> Pgo), the branch gas damper B 33 and the branch gas damper A 32 are closed (strictly opening degree is small). (Step (13)), the amount of air entrained recycle gas to recycle gas jet nozzles 19a and 19c and recycle gas jet 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 B 33 and the branch gas damper A 32 are opened (strictly opening degree is large). (Step 14), the amount of air entrained recycle gas to the recycle gas jet nozzles 19a and 19c and the recycle gas jet nozzles 19b and 19d is increased.

Since the combustion control apparatus of the stocker type incinerator 2 according to the fourth embodiment is configured as described above, the recycle gas pressure in the vicinity of the recycle gas jet nozzle is detected using the relationship that the recycle gas amount is proportional to the recycle gas pressure. And controlling the opening degree of the branch gas damper B 33 and the branch gas damper A 32 so that the recycle gas pressure Pg becomes the target gas pressure Pgo, thereby recycling the air mixture as secondary air. It is possible to stably hold the amount of gas in such an amount that the air mixed recycle gas can be completely burned, and the combustion state can be averaged to hold stable combustion.

Moreover, based on the detection value of the said gas pressure from the gas pressure sensor B42 and the gas pressure sensor A41 which were provided in the 2nd left and right places (two left side, two right side) of the secondary combustion chamber 4, respectively. The opening degree of each branch gas damper B 33 and branch gas damper A 32 is computed so that the said gas pressure of several places may become a predetermined target pressure, and each branch gas damper B 33 and branch gas damper A Since it controls by the opening degree calculated value of 32, it distributes the amount of air mixing recycle gas to the recycling gas blowing nozzles 19a and 19c and the recycling gas blowing nozzles 19b and 19d which were provided in the several places of the secondary combustion chamber 4, respectively. Can be adjusted freely, and it becomes possible to supply the air mixed recycle gas uniformly in the circumferential direction of the combustion chamber, so that combustion can be averaged.

As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment of a technology, Various deformation | transformation and a change are possible based on the technical idea of this invention.

Claims (6)

delete After introducing primary air from below the stockers 21, 22, and 23 into which the burned object is introduced, and performing combustion in the combustion chamber 3 above the stockers 21, 22, and 23, the combustion chamber ( While performing secondary combustion above 3), the recycle gas which extracted a part of combustion exhaust gas inside the combustion chamber 3, and the air supplied through the air passage 30 are mixed, and this air mixing recycle is performed. In the combustion control apparatus of the stocker type incinerator (2) configured to supply gas into the furnace through the recirculation passages (15, 17, 18) by the fan (13), An air flow rate adjusting means 30a for adjusting an air flow rate in the air passage 30, and gas concentration detecting means 37 or 37a for detecting a gas concentration of the air mixed recycle gas, and the gas concentration detection The gas concentration detection value of the air mixed recycle gas from the means 37 or 37a is input, and the air flow rate is adjusted such that the gas concentration of the air mixed recycle gas is a predetermined target gas concentration based on the gas concentration detected value. Combustion control means 60 is provided which calculates the passage area of the means 30a and controls the air flow rate adjusting means 30a to the passage area calculated value. NOx concentration detecting means 38 for detecting NOx concentration in the combustion exhaust gas and CO concentration detecting means 39 for detecting CO concentration in the combustion exhaust gas are provided, and the combustion control means 60 is provided. Based on the gas concentration detection value input from the gas concentration detecting means 37 or 37a, the gas concentration of the air mixed recycle gas becomes a predetermined target gas concentration and is input from the NOx concentration detecting means 38. Based on the NOx concentration detection value, the NOx concentration in the combustion exhaust gas becomes equal to or less than a predetermined target NOx concentration and the CO in the combustion exhaust gas based on the CO concentration detection value input from the CO concentration detection means 39. The passage area of the air flow rate adjusting means 30a is calculated so that the concentration is equal to or less than a predetermined target CO concentration, and the air flow rate adjusting means 30a is moved to the passage surface. Characterized in that is configured to control the output value Combustion control device of stocker type incinerator. delete After introducing primary air from below the stockers 21, 22, and 23 into which the burned object is introduced, and performing combustion in the combustion chamber 3 above the stockers 21, 22, and 23, the combustion chamber ( While performing secondary combustion above 3), the recycle gas which extracted a part of combustion exhaust gas inside the combustion chamber 3, and the air supplied through the air passage 30 are mixed, and this air mixing recycle is performed. In the combustion control apparatus of the stocker type incinerator (2) configured to supply gas into the furnace through the recirculation passages (15, 17, 18) by the fan (13), An air flow rate adjusting means 30a for adjusting an air flow rate in the air passage 30, and a temperature detecting means 35 or 35a for detecting a temperature of the air mixed recycle gas and the air mixed recycle gas Gas concentration detecting means 37 or 37a for detecting a gas concentration, the temperature detected value of the air mixed recycle gas from the temperature detecting means 35 or 35a, and the gas concentration detecting means 37 or 37a. The gas concentration detection values of the air mixed recycle gas are input, and based on these temperature detected values and the gas concentration detected values, the temperature of the air mixed recycle gas becomes a predetermined target temperature, and the gas concentration of the air mixed recycle gas Calculates the passage area of the air flow rate adjusting means 30a so that the target gas concentration becomes a predetermined target gas concentration, thereby raising the air flow rate adjusting means 30a. Combustion control means 60 for controlling the gas passage area calculated value is provided, NOx concentration detecting means 38 for detecting NOx concentration in the combustion exhaust gas and CO concentration detecting means 39 for detecting CO concentration in the combustion exhaust gas are provided, and the combustion control means 60 is provided. Based on the gas concentration detection value input from the gas concentration detecting means 37 or 37a, the gas concentration of the air mixed recycle gas becomes a predetermined target gas concentration and is input from the NOx concentration detecting means 38. Based on the NOx concentration detection value, the NOx concentration in the combustion exhaust gas becomes equal to or less than a predetermined target NOx concentration and the CO in the combustion exhaust gas based on the CO concentration detection value input from the CO concentration detection means 39. The passage area of the air flow rate adjusting means 30a is calculated so that the concentration is equal to or less than a predetermined target CO concentration, and the air flow rate adjusting means 30a is moved to the passage surface. Characterized in that is configured to control the output value Combustion control device of stocker type incinerator. After introducing primary air from below the stockers 21, 22, and 23 into which the burned object is introduced, and performing combustion in the combustion chamber 3 above the stockers 21, 22, and 23, the combustion chamber ( While performing secondary combustion above 3), the recycle gas which extracted a part of combustion exhaust gas inside the combustion chamber 3, and the air supplied through the air passage 30 are mixed, and this air mixing recycle is performed. In the combustion control apparatus of the stocker type incinerator (2) configured to supply gas into the furnace through the recirculation passages (15, 17, 18) by the fan (13), Recycle gas flow rate adjusting means (013, 30a, 32) for adjusting the flow rate of the recycled gas mixture in the recycle gas passages (15, 17, 18) through which air mixed recycle gas supplied to the combustion chamber is mixed with air to the recycle gas. , 33) and a gas flow meter 90 for detecting the flow rate of the air mixed recycle gas, and based on the flow rate detection value of the recycle gas input from the gas flow meter 90, The passage area of the recycle gas flow rate adjusting means (013, 30a, 32, 33) is calculated so that the flow rate becomes a predetermined target flow rate, and the recycle gas flow rate adjusting means (013, 30a, 32, 33) is calculated from the passage area. Providing combustion control means for controlling by value, Recirculating gas outlets 19a, 19b, 19c, and 19d are provided in plural places in the combustion chamber 3, and the recirculating gas passages 15, 17, and 18 are respectively recirculated gas outlets 19a, 19b, 19c, And a plurality of recirculation gas flow rate adjusting means (013, 30a, 32, 33) for adjusting the flow rate of the air mixture recirculation gas in each of the recirculation gas passages, and connecting to 19d) to detect the pressure in the combustion chamber. The detection means 41, 42 are provided corresponding to the recirculating gas flow rate adjusting means 013, 30a, 32, 33, and the combustion control means 60 is provided from the plurality of combustion chamber pressure detection means 41, 42. Based on the combustion chamber pressure detection value of, the passage area of each of the recirculating gas flow rate adjusting means 013, 30a, 32, 33 is calculated so that the plurality of combustion chamber pressures become a predetermined target pressure, and the recirculating gas is calculated. Flow adjusting means (013, 30a, 32, 33 are configured to control the passage area calculated value. Combustion control device of stocker type incinerator. delete

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