TWI331201B - Combustion control system for stoker-type incinerator - Google Patents

Description

1^31201 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a combustion control device for a hearth type incinerator, which is introduced once from a bed of a burned object such as garbage or industrial waste. After the air is burned once in the combustion chamber on the hearth, secondary combustion is performed on the upper portion of the combustion chamber. [Prior Art] The hearth type incinerator is an incinerator having the following configuration: a hearth with a fire lattice and a movable section alternately arranged, and a hydraulic device is used to move the movable section back and forth, thereby making self-advance The garbage (burned matter) put into the hopper is pulverized and advanced, and the garbage is dried in a drying belt disposed on the side of the hearth, and then the air is injected into the main combustion zone and the main combustion is performed. And burning after the combustion residual portion is carried out in the combustion zone after the most downstream side. With regard to such a hearth type incinerator, the patent document 曰 (曰本专利 No. 3582710) provides a technique of recirculating a portion of the combustion chamber extracted from the combustion chamber after exhausting the exhaust gas through the recirculation passage. The secondary combustion portion to the combustion chamber is supplied together with the secondary air for combustion. In the technique provided in Patent Document 1, a part of the combustion exhaust gas in the combustion chamber of the extraction furnace is sent to the heat exchange moder, and the recirculation gas and the secondary air and the second are arranged in the heat exchanger. The secondary air undergoes heat exchange 'to preheat the n gas and the secondary air and cools the recycle gas' and further puts the recycled gas of the 118513.doc-shirt into the tail by the fan disposed on the tail side of the heat exchanger The upstream side portion of the secondary air supply port in the combustion chamber makes the gas environment on the upstream side of the secondary air supply port a weakly reducing gas atmosphere, and the ratio of the total air in the combustion chamber after the secondary air is supplied is controlled to 1.3. Left and right, the unburned gas or unburnt is completely burned and NOx is reduced. [Patent Document 1: Japanese Patent No. 358271] [Disclosure] [Problems to be Solved by the Invention] However, in the prior art of the patent document as described above, there are the following problems. That is, in the above prior art, a part of the combustion exhaust gas in the combustion chamber on the hearth is extracted and sent as a recirculation gas to the heat exchanger, in which heat exchange is performed with the primary air and the secondary air. After cooling the recirculated gas, the cooled recirculated gas is introduced into the upstream side of the secondary air supply port in the combustion chamber by a fan disposed on the tail side of the heat exchanger. Therefore, a heat exchanger must be used. The heat is exchanged between the recirculating gas and the air (primary air and secondary air) to be cooled, and then sent to the fan, so that the structure of the combustion exhaust gas recirculation system becomes complicated, and the number of components increases, resulting in an increase in the cost of the device. Further, although the combustion exhaust gas which is cooled by the heat exchanger but has a large amount of corrosive components is directly supplied to the fan, the fan is easily corroded, and the durability and life of the fan are lowered. In order to solve the problems of the prior art described above, the inventors of the present invention have provided the invention of the Japanese Patent Application No. 2005-059846 (filed on March 4, 2005). 118513.doc

With respect to the fan, the partially burned exhaust gas extracted from the combustion chamber of the furnace bed is returned to the combustion chamber via the recirculation passage, and in the previously claimed invention, the upstream portion of the fan in the recirculation passage is Directly mixing the air composed of one of the primary air or the secondary air for combustion into the recirculating gas, and introducing it to the recirculating gas returning fan, and then the recirculating gas composed of the mixed gas by the fan Refluxing into the combustion chamber, whereby the combustion exhaust gas can be cooled by the air, and the combustion exhaust gas is diluted and mixed with the air to be introduced into the fan, thereby eliminating the need to cool the recirculating gas as in the prior art described above. The heat exchanger, thereby simplifying the construction of the combustion exhaust gas recirculation system, and reducing the number of constituent parts reduces the cost of the apparatus of the incineration plant.

Further, in the invention of the prior application, the recirculated gas introduced into the fan for recirculating gas recirculation is cooled by the low temperature air and diluted by the air, and the concentration of the combustion exhaust gas is changed. Low, and further, the salt which is a corrosive component in the exhaust gas is solidified by the above cooling to reduce the corrosion component, and therefore, the fan temperature is lowered and the thermal stress of the fan is reduced, and the corrosion can be reduced as described above. The recirculating gas of the component is introduced into the fan to suppress the fan sulphur', thereby obtaining a low-cost fan without using a high (four) thermal material, and the required durability and life are maintained. However, in the invention of the above-mentioned prior application, only the mixing of the recirculating gas and the air (combustion-primary air and secondary air) in the above-described hearth incinerator and the method of refluxing to the incinerator side, and The mixing and the recirculation to the incinerator side are carried out, and the invention of the prior invention does not disclose that the specific mixing ratio of the recirculating gas to the air recirculated to the incinerator side is controlled by 118513.doc 1331201, and mixed with air. The combustion control in the incinerator in which the return gas is recirculated. The present invention has been made in view of such a situation, and an object thereof is to provide a combustion control device for a hearth incinerator capable of recirculating air mixed back to the incinerator side via a recirculation passage having a recirculation fan with high precision. Qi Zhao implements mixing ratio control and implements combustion control in the incinerator and can suppress the generation of noble components such as N〇x, c〇 by a relatively simple and low-cost structure and achieve complete combustion efficiency with higher combustion efficiency. combustion. [Technical means for solving the problem] In order to solve the problem of the above-mentioned prior art, the invention of claim 1 is a combustion control device for a hearth type incinerator, which is configured to be introduced from below a hearth into which an incineration is introduced. After primary combustion is performed once in the combustion chamber on the hearth, secondary combustion is performed above the combustion chamber, and a part of the combustion gas in the combustion chamber is extracted and extracted, and the air supplied through the air passage is borrowed. The air mixing and recirculation body is supplied to the furnace through a recirculation passage, and the combustion control device of the hearth incinerator is characterized in that an air flow adjustment mechanism for adjusting an air flow is provided in the air passage. On the other hand, a temperature detecting means for detecting the temperature of the air mixed recirculating gas, and a combustion detecting means for inputting a temperature detecting value of the air mixed recirculating gas from the temperature detecting means is provided. Calculating the temperature of the air mixed recirculation gas based on the temperature detection value Passage area becomes a predetermined target temperature of the air flow rate adjustment mechanism, the adjustment means and said air flow rate control passage area to the calculated value 118513.doc -9- 1331201. Further, in the invention of claim 2, in the combustion control device, the air flow rate adjusting means for adjusting the air flow rate is provided in the air passage, and the gas concentration detecting means and the combustion control means are provided. The gas concentration detecting means detects the gas concentration of the air-mixed recirculation gas, and the combustion control means inputs a gas concentration detection value of the air-mixed recirculation gas from the gas concentration detecting means, and calculates the air based on the gas concentration detection value. The gas concentration of the mixed recycle gas is a passage area of the air flow rate adjusting mechanism that is a predetermined target gas concentration, and the air flow rate adjusting mechanism is controlled to the channel area calculated value. According to the invention of claim 2, in the invention of claim 3, the NOx concentration detecting means for detecting the NOx concentration in the combustion exhaust gas and the CO concentration detecting means for detecting the CO concentration in the combustion exhaust gas are provided, and the combustion control means is Preferably, the gas concentration detection value input from the gas concentration detecting means, the concentration detection value input from the enthalpy concentration detecting means, and the CO concentration detection value rounded from the CO concentration detecting means are configured. It is calculated that the gas concentration of the air-mixed recirculation gas is a predetermined target gas concentration, the enthalpy concentration in the combustion exhaust gas is equal to or lower than a predetermined target enthalpy concentration, and the c 〇 concentration in the combustion exhaust gas is set in advance. The channel area ' of the air flow rate adjusting means below the target C ◦ concentration and controlling the air flow rate adjusting means to the channel area calculated value. Further, in the invention of claim 4, in the above-described combustion control device 118513.doc • 10 - 1331201, an air flow rate adjusting mechanism for adjusting an air flow rate is provided in the air passage, and a temperature detecting mechanism is provided on the other hand. a gas concentration detecting means for detecting a temperature of the air mixed recirculating gas, wherein the gas concentration detecting means detects a gas concentration of the air mixed recirculating gas, and the combustion control means inputs the temperature from the temperature The temperature detection value of the air-mixed recirculation gas of the detection means and the gas concentration detection value of the air-mixed recirculation gas from the gas concentration detecting means are calculated based on the temperature detection value and the gas concentration detection value, and the air mixture is calculated. The temperature of the circulating gas is a predetermined target temperature, and the gas concentration of the air-mixing recirculation gas is a channel area of the air flow rate adjusting mechanism that is a predetermined target gas concentration, and the air flow rate adjusting mechanism is controlled to The value of the area calculated. Further, in the invention of claim 5, in the combustion control device, a recirculation gas flow rate adjusting mechanism that adjusts a flow rate of the air mixed recirculation gas is provided in a recirculation gas passage through which the air mixed recirculation gas flows, The air-mixed recirculation gas system supplies air to the above-mentioned recirculated gas and supplies it to the combustor; and provides a gas flow meter and a combustion control mechanism that detects a flow rate of the air-mixed recirculation gas, the combustion The control unit calculates a passage area of the recirculation gas flow rate adjustment mechanism that is a predetermined target flow rate based on a flow rate detection value of the recirculation gas input from the gas flow meter, and calculates the recirculation gas. The flow rate adjustment mechanism controls the channel area calculation value. 118513.doc 1331201 In addition to the invention of claim 5, in the invention of claim 6, the recirculation gas is blown at a plurality of points in the above-mentioned dance chamber, and a plurality of the above-mentioned re-nucleating gas materials are connected to the feed material. a gas blowing outlet, wherein the recirculating gas flow rate adjusting mechanism for adjusting the flow rate of the air mixed recirculation gas is provided in each of the recirculation gas passages t, and the combustion chamber Lili that detects the pressure of the combustion chamber is provided corresponding to the recirculation gas flow rate adjusting mechanism testing facility,

Preferably, the combustion control means is configured to calculate, in accordance with the combustion chamber pressure detection value from the plurality of combustion chamber pressure (four) means, the plurality of combustions to the respective pressures at which the pressure is a predetermined target pressure. The passage area of the adjustment mechanism is controlled, and each of the above-described recirculation gas flow rate adjustment mechanisms is controlled to the channel area calculation value. [Effects of the Invention]

According to the invention of claim 1, the combustion control means adjusts the opening degree of the air flow rate adjusting means based on the temperature detection value of the air mixed recirculation gas introduced into the recirculation fan that carries the air mixed with the recirculation gas, and controls the mixing of the air. Mixing the amount of air in the recirculating gas so that the temperature of the air-mixed recirculating gas becomes below a predetermined allowable maximum temperature, so that even if the temperature of the recirculating gas rises for some reason, The amount of air is increased in response to the increase in temperature, and the temperature of the air-mixed recirculation gas sucked by the recirculation fan is appropriately maintained below the allowable maximum temperature. Thereby, the overheating of the recirculating fan caused by the above air mixed recirculation gas can be prevented, and high durability can be maintained without using a high cost fan composed of a special heat resistant material for the recirculating fan. 118513.doc -12- 1331201 In the invention of claim 2, the combustion control mechanism is used to adjust the air according to the gas concentration detection value (preferably the oxygen concentration detection value) of the recirculated gas mixed with the air introduced in the recirculation fan. The opening degree (channel area) of the flow rate adjusting mechanism controls the amount of air mixed into the air mixed recirculation gas so that the gas concentration of the air mixed recirculation gas becomes a predetermined allowable gas concentration, and thus, for example, even if When the oxygen in the circulating gas is consumed and the oxygen concentration becomes too small, the amount of air can be increased by increasing the opening degree of the air flow adjusting mechanism, and stable combustion can be performed under the above-described allowable minimum oxygen concentration. . Further, according to the invention of claim 3, 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 can be kept at or below the allowable maximum NOx concentration, and the combustion exhaust can be made. The concentration of CO in the medium is kept below the maximum allowable CO concentration, thereby promoting the purification of the exhaust gas. According to the invention of claim 4, the multiplication effect of the invention of claim 1 and the invention of claim 2 can be obtained. In other words, in the invention of claim 4, (1) the combustion control means adjusts the opening degree of the air flow rate adjusting means based on the temperature detection value of the air-mixed recirculation gas introduced in the recirculation fan, and controls the mixing of the air mixture. The amount of air in the circulating gas is such that the temperature of the air-mixed recirculating gas becomes equal to or lower than a predetermined allowable maximum temperature. Therefore, even if the temperature of the recirculating gas rises for some reason, it may correspond to This temperature rise increases the amount of air, and the temperature of the air mixed with the recirculating gas sucked by the recirculating fan 118513.doc -13 - 1331201 is suitably maintained below the allowable maximum temperature. Thereby, it is possible to prevent overheating of the recirculating fan caused by the above air mixed recirculation gas, and it is possible to maintain high durability without using a high cost fan composed of a special heat resistant material for the recirculating fan. (2) adjusting the opening degree (channel area) of the air flow rate adjusting mechanism 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 mechanism Controlling the amount of air mixed into the air-mixed recirculation gas so that the gas concentration of the air-mixed recirculation gas becomes a predetermined allowable gas concentration, and thus, for example, even if oxygen in the recirculating gas is consumed, the oxygen concentration is changed. When it is too small, the amount of air may be increased by increasing the opening degree of the air flow rate adjusting means, and stable combustion may be performed in a state of being above the allowable minimum oxygen concentration. In the invention of claim 5, the recirculation gas flow rate adjusting mechanism for adjusting the flow rate of the air mixed recirculation gas is provided in a suction passage (recirculation gas passage) through which the air mixed recirculation gas flows, and based on the detection of the air a flow rate detection value of the recycle gas of the gas flow meter that mixes the flow rate of the recycle gas, and controls the recycle gas flow rate adjustment mechanism to change the flow rate of the recycle gas to a predetermined target flow rate, thereby controlling the recycle The opening degree of the gas flow rate adjusting mechanism is such that the flow rate of the recirculating gas becomes the target flow rate, and the amount of the air mixed recirculating gas as the secondary air can be stably maintained in an amount that the air mixed recirculating gas can be completely burned. Thereby, the combustion state can be averaged to maintain stable combustion. Further, if the invention of claim 6 is constructed, a recirculation gas outlet port is provided at a plurality of portions of the combustion chamber, and a combustion chamber pressure detecting mechanism is provided corresponding to the recirculation gas flow rate adjusting mechanism, the recirculation gas The flow rate adjustment mechanism is disposed in each of the recirculation gas passages connected to the recirculation gas outlet, and uses a combustion control mechanism to detect a recirculation gas pressure near the recirculation gas outlet, and utilizes a recirculation gas amount and a recirculation gas. The proportional relationship of the pressure 'controls the pressure of the recirculating gas to become the target gas pressure, so that the distribution of the amount of air mixed with the recirculated gas to the recirculation gas outlet of the plurality of combustion chambers can be freely adjusted, Thereby, the air mixed with the recirculating gas can be uniformly supplied to the circumferential direction of the combustion chamber, whereby the combustion can be averaged. [Embodiment] Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. [First Embodiment] Fig. 1 is a configuration diagram of a hearth incinerator according to a first embodiment of the present invention, Fig. 2 is a schematic configuration diagram of a combustion control mechanism according to the first embodiment, and Fig. 3 is the first embodiment. Form of combustion control block diagram. In Fig. 1, 1 is a garbage feed hopper for inputting waste materials such as garbage or industrial waste, and 2 is a hearth type incinerator "in the hearth type incinerator 2, the input port from the garbage feed hopper 1 To the bottom of the furnace, a drying belt hearth 21 mainly constituting the drying belt, a main combustion belt hearth 22 mainly constituting the combustion belt, and a combustion belt hearth 23 mainly constituting the afterburning belt are laid. The drying belt hearth 21 is located on the most upstream side, the main combustion zone hearth 22 is located on the lower side of the drying belt hearth 21, and the rear combustion zone hearth 23 is located on the lowermost side downstream of the main combustion zone hearth 22. Here, the main combustion zone refers to the H8513.doc -15-1331201 region where the flame is burned on the garbage layer.

Each of the hearths 21, 22, and 23 includes a moving fire lattice disposed between the fixed fire lattices, and after the garbage (burned matter) is put into the garbage, the garbage is moved in the hearth 21 by the reciprocating movement of the moving fire lattice. Drying, main combustion is carried out in the hearth 22, and finally post-combustion is carried out in the hearth 23. Further, in the present embodiment, the number of the main combustion zone hearths 22 is three, but it may be one or plural. 8 is an ash storage tank. Further, a combustion chamber 3 is provided above the hearths 21, 22, and 23, and a secondary combustion chamber 4 is provided thereon. 19a, 19b, 19c, and 19d are recirculating gas outlet nozzles disposed facing the secondary combustion chamber 4. Further, the 81 series is a steel furnace connected to the exhaust outlet of the secondary combustion chamber 4. In the drying belt hearth 21, the burning belt hearth 22 and the post-combustion belt hearth 23,

. Further, there are primary air pipes 51, 52 (three) which are opened in the bellows of the respective lower portions, and 53, primary air is supplied from the primary air pipe. 6 is a primary air supply wind feather, 5 is a human air main pipe, and is connected to the fan 6, and each of the primary air pipes 51, 52 (three), 53; and the primary air system that is pumped by the fan 6 The primary air main pipe 5 is distributed to the primary air pipes 51, 52, 53. The primary air tubes 51, 52, 53 are provided with opening and closing dampers 54, 55, 56 respectively for opening and closing the primary air tubes. Further, in the primary air main unit 5, an opening and closing damper for opening and closing the primary air main is provided. 7. 40 is a recirculation gas extraction port for extracting a portion of the combustion exhaust gas in the primary combustion chamber 3 (which may also be in the secondary combustion chamber 4) as a recirculation gas, extracted from the recirculation gas extraction port 40. The recirculating gas is introduced into the recirculation passage t31 of the recirculating fan 13 via the cyclone separator 12, the recirculation passage 16, the mixed gas passage 14, and the cyclone separator 12 for separating the solid foreign matter in the mixed gas, that is, The recirculation gas extraction port 40 and the suction passage 3i are connected via a replay ring passage 16, and a gas damper 13 for opening and closing the inlet of the recirculation fan 13 is provided in the suction passage 31. 30 is a mixed air passage branched from the primary air main pipe 5 and connected to the suction passage 31 which is an upstream portion of the recirculation fan 13, and 3〇a is an air damper (opening and closing damper)' for opening and closing the mixed air passage 3〇, When the air damper 30a is opened, the primary air from the primary air main pipe 5 is supplied to the inlet of the recirculation fan 13 of the suction passage 31 via the mixed air passage 30, whereby the primary air is mixed into the above-mentioned recirculation gas, and then via The mixed gas passage 14, the cyclone 12, and the suction passage 31 are introduced into the recirculation fan 13. The air damper 30a can automatically perform opening degree adjustment (flow rate adjustment) by receiving a control signal from a combustion control mechanism 60, which will be described later, by adjusting the opening degree of the air damper 30a to flow through the mixed air passage. The flow rate of the primary air of 30 is adjusted to adjust the mixing ratio of the recirculating gas and the primary air in the air mixed recirculation gas, and the air mixed recirculation gas system is introduced through the mixed gas passage 14, the cyclone 12, and the suction passage 31. The mixed gas of the recirculating gas of the recirculating fan 13 and the primary air. Then, the air mixed with the primary air mixed by the recirculating fan 13 to the recirculation passage 15 is mixed with the recirculating gas, and is branched to two recirculation passages. In 17, 18, and one side of the recirculation passage 17 is fed into one side of the two rows and then 118513.doc • 17-cycle gas blowing nozzles 19a, 19c, and the other side of the recirculation passage 18 is sent to the other side The two rows of recirculating gas blowing nozzles 19b and 19d are further ejected into the secondary combustion chamber 4 by the recirculating gas blowing nozzles 19a, 19c and 19b and 19d. Further, a branch gas damper VII 33 for opening and closing the recirculation passage 17 is provided in the recirculation passage 17, and a branch gas damper A32 for opening and closing the recirculation passage 18 is provided in the recirculation passage 18. 35 is a temperature sensor disposed in the recirculation passage 15 for detecting the temperature of the air mixed recirculation gas (the temperature sensor 35a may also be disposed in the mixed gas passage 14. Hereinafter, the temperature sensor 35) Be explained). 36 is an air damper opening detector for detecting the opening degree of the air damper 30a. The hearth incinerator 2 according to the first embodiment of the present invention includes a combustion control mechanism 60'. The combustion control mechanism 60 is electrically connected to the temperature sensor 35 (including 35a), the air damper 30a, and the air damper opening degree. The detector 36 inputs the temperature detection value of the air-mixed recirculation gas from the temperature sensor 35, and inputs the opening detection value of the air damper 30a from the air damper opening detector 36 to adjust the air according to the detection values. The opening degree of the damper 3〇a controls the mixing ratio of the recirculation gas and the primary air in the air mixed recirculation gas to a target mixing ratio so that the temperature of the air mixed recirculation gas becomes the target temperature. When the hearth incinerator 2 is operated, a part of the combustion exhaust gas extracted from the combustion chamber (the primary combustion chamber 3 or the secondary combustion chamber 4) on the furnace bed via the recirculation gas extraction port 40 is used as a recirculation gas. The recirculation passage 16' is mixed with the primary air from the mixed air passage 30, and then introduced into the recirculation fan 13 via the mixing 118513.doc • 18· 1331201 gas passage 14, the cyclone 12 and the suction passage 31. Further, the recirculating gas which is sent to the recirculation passage 15 by the recirculation fan 13 is mixed with the recirculated gas, and is branched into the two recirculation passages 17, 18' and recirculated to one side. The gas blowing nozzles 1 and 19c and the other side of the recirculating gas blowing nozzles 19b and 19d are further ejected into the secondary combustion chamber 4 by the recirculating gas blowing nozzles 19a, 19C and 19b and 19d. In this manner, the recirculating gas composed of a part of the combustion exhaust gas can be cooled by the primary air, and the combustion exhaust gas is diluted by the mixing with the primary air, and then recirculated to the recirculation fan 13. Next, the combustion control mechanism and the combustion control sequence of the first embodiment will be described with reference to Figs. 2 and 3 . The combustion control unit 6A of the present 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, and an air damper opening degree adjustment amount calculation unit. 65. The air damper opening degree calculation unit 66 inputs the temperature detection value of the air-mixed recirculation gas detected by the temperature sensor 35 to the gas temperature comparison unit 61 of the combustion control unit 60. The allowable maximum temperature (preferably about 3 Torr) of the air-mixed recirculating gas fed into the recirculation fan 13 is set in the reference gas temperature setting unit Q. Further, the gas temperature comparison unit 61 calculates a temperature deviation which is the temperature detection value of the air-mixed recirculation gas from the temperature sensor 35 and the temperature of the allowable maximum temperature set in the reference gas temperature setting unit 62. 118513.doc -19· 1331201 Degree deviation. Then, the air damper opening degree calculating means 600 shown in Fig. 2 calculates the opening degree of the air damper 30a in the following order. In Fig. 3, the calculated value of the temperature deviation from the gas temperature comparing unit 61 is input to the air amount adjustment amount calculating unit 64. In the gas temperature/air amount setting unit 63, the amount of air supplied through the air passage 30 and the air and the recirculation gas from the recirculation passage 16 are mixed in advance by a test result or a simulation calculation. The relationship of the above air mixed recycle gas temperature. Further, the air amount adjustment amount calculation unit 64 calculates (extracts) the 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 outputs it to the air amount/air amount setting unit 63. Air damper opening degree adjustment amount calculation unit 65. The air damper opening degree adjustment amount calculation unit 65 sets the relationship between the air amount and the air damper opening degree as the opening degree characteristic of the air damper 30a, and the air damper opening degree adjustment amount calculation unit 65 The air damper opening degree adjustment amount corresponding to the air amount deviation calculation value from the air amount adjustment amount calculation unit 64 is calculated and output to the air damper opening degree calculation unit 66. The air damper opening degree calculation unit 66 calculates or calculates the opening degree detection value of the air damper 30a input from the air damper opening degree detector 36 by adding or subtracting the air damper opening degree adjustment amount. The air damper opening degree adjustment amount of the portion 65 calculates a target value of the air damper opening degree, that is, an air damper opening degree corresponding to the reference gas temperature, and controls the air damper 30a to the target opening degree. 118513.doc •20- 1331201

In the combustion control device of the hearth incinerator 2 according to the first embodiment, the combustion control unit 60 adjusts the air damper 3〇a based on the temperature detection value of the air-mixed recirculation gas passing through the recirculation fan η. Controlling the amount of air mixed into the air-mixed recirculation gas so that the temperature of the air-mixed recirculation gas becomes lower than a predetermined allowable maximum temperature, so that the temperature of the recirculating gas is caused even for some reason At the time of ascending, the amount of air may be increased in accordance with the increase in temperature, and the temperature of the air-mixed recirculation gas sucked by the recirculation fan 13 may be appropriately maintained at or below the allowable maximum temperature. Thereby, it is possible to prevent overheating of the recirculation fan 13 caused by the air-mixed recirculation gas. Therefore, it is not necessary to use a special heat-resistant material for the recirculation fan 13 to maintain the high durability. [Second Embodiment]

Fig. 4 is a structural view of a hearth incinerator according to a second embodiment of the present invention, Fig. 5 is a schematic configuration diagram of a combustion control mechanism according to the second embodiment, and Fig. 6 is a diagram showing a combustion control block of the second embodiment. . In the second embodiment of the present invention, the oxygen concentration is used as the gas concentration in the mechanism for detecting the gas concentration of the air-mixed gas and controlling the opening degree of the air damper based on the gas concentration. In addition, in the hearth type incinerator 2 according to the second embodiment of the present invention, the concentration of the other components may be mixed with air such as C〇2 or the like, as shown in FIG. Detecting the oxygen concentration curvature in the m-to-recycle gas (or the oxygen concentration meter 37a), and detecting the NOx concentration sensor 3 of the above-mentioned secondary combustion chamber 4 outlet: 118513.doc 1331201 8. A CO concentration sensor 39 for detecting c〇 concentration. Further, the combustion control mechanism 60 of the present embodiment includes the oxygen concentration comparison unit 71' reference oxygen concentration setting unit 72, the N〇x concentration comparison unit 73, and the reference enthalpy concentration setting unit 74, as shown in Figs. 5 and 6 . 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, krypton concentration/air amount setting unit 80, and air amount adjustment The calculation unit 81, the CO concentration/air amount setting unit 82, the air damper opening degree adjustment amount calculation unit 65, and the air damper opening degree calculation unit 66' calculate the air based on the oxygen concentration detection value from the oxygen concentration meter 37. The oxygen concentration of the mixed recycle gas becomes the opening degree of the air damper 30a of the predetermined target oxygen concentration and controls the opening degree of the air damper 3〇a to the calculated degree of opening degree. Further, the combustion control mechanism 60 is 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 are calculated such that the NOx concentration in the combustion exhaust gas is equal to or lower than a predetermined target n〇x concentration, and combustion is performed. exhaust The CO concentration is changed to the opening degree of the air damper 30a which is equal to or lower than the target CO concentration, and the opening degree of the air damper 30a is controlled to the opening degree calculated value. Hereinafter, the second embodiment will be described with reference to FIGS. 5 and 6 . Form combustion control mechanism and combustion control sequence. In the second embodiment, the air damper opening degree calculation means 600 calculates the opening degree of the air damper 30a based on the oxygen concentration detection value from the oxygen concentration meter 37 (37a). Further, the following operation 118513.doc -22-1331201 will be described with reference to Fig. 6 for combustion control using NOx concentration and c〇 concentration in the combustion exhaust gas in addition to the above oxygen concentration. In the figure, the oxygen concentration detection value of the air-mixed recirculation 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 mechanism 60. Further, the detected value of the enthalpy in the combustion exhaust gas detected by the enthalpy concentration sensor 38 is input to the enthalpy concentration comparing unit 73 of the combustion control unit 60. Further, the C0 concentration detection value in the combustion exhaust gas detected by the c〇 concentration sensor 39 is input to the CO concentration comparison unit 75 of the combustion control unit 60. The allowable minimum oxygen concentration of the air-mixed recirculation gas fed to the recirculation fan 13 is set in the reference oxygen concentration setting unit 72. In the reference enthalpy concentration setting unit 74, the maximum allowable susceptibility in the combustion exhaust gas is set. The allowable maximum CO concentration in the combustion exhaust gas is set in the reference CO concentration s setting unit 76. In the oxygen concentration comparison unit 71, the oxygen concentration detection value in the air-mixed recirculation gas from the oxygen concentration meter 37 is calculated as the oxygen concentration deviation of the allowable minimum oxygen concentration set in the reference oxygen concentration setting unit 72, and is input to the air. The amount adjustment amount calculation unit 77 ^ calculates the enthalpy concentration detection value and the reference enthalpy concentration setting unit 74 in the combustion exhaust gas from the enthalpy concentration sensor 38 in the N 〇 x concentration comparison unit 73 . In addition, the enthalpy concentration deviation of the maximum concentration is input to the air amount adjustment amount calculation unit 79. Further, the CO concentration comparison unit 75 calculates the concentration from the c concentration sensor 39. The C〇 concentration detection value in the combustion exhaust gas is deviated from the CO concentration of the allowable maximum CO concentration set in the reference (7) concentration setting unit % 118513.doc • 23· 1331201, and is input to the air amount adjustment amount calculation unit 81. Then, In the oxygen concentration/air amount setting unit 78, the amount of air supplied by the air passage 30 and the recirculation gas from the recirculation passage 16 are set in advance by test results or simulation calculations. In the enthalpy concentration/air amount setting unit 80, the amount of air supplied by the air passage 30 is set in advance by the test result or the simulation calculation. In the CO concentration/air amount setting unit 82, the amount of air supplied by the air passage 30 and the combustion exhaust gas are set in advance by the test result or the simulation calculation. In the air amount adjustment amount calculation unit 77, the oxygen concentration/air amount setting unit 78 calculates (extracts) the air corresponding to the calculated value of the oxygen concentration deviation from the oxygen concentration comparison unit 71. The amount of deviation is input to the air damper opening degree adjustment amount calculation unit 65. The air amount adjustment amount calculation unit 79 calculates (extracts) the enthalpy concentration/air amount setting unit 80 from the erbium concentration comparison unit 73. The amount of air corresponding to the calculated value of the enthalpy concentration deviation is input to the air damper opening degree adjustment amount calculation unit 65. Further, the amount of air In the entire 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 is input to the air damper opening degree. 118513.doc • 24· 1331201 The air damper opening degree adjustment amount calculation unit 65 sets the relationship between the air amount and the air damper opening degree as the opening characteristic of the air damper 3〇a. The air damper opening degree adjustment amount calculation unit 65 sequentially calculates the air damper opening degree adjustment amount based on the air amount deviation corresponding to the oxygen concentration deviation, and the air corresponding to the NOx concentration deviation. The amount of deviation is based on the air damper opening adjustment amount and the air damper opening degree adjustment amount based on the air amount deviation corresponding to the above C 〇 concentration deviation, and is selected from the air damper opening degree adjustment amount The optimum air damper opening degree adjustment amount ' is input to the air damper opening degree calculation unit 66. Then, the air damper opening degree calculation unit 66 adds or subtracts the air damper opening degree adjustment amount to the opening degree detection value of the air damper 3〇a input from the air damper opening degree detector 36. The air damper opening degree adjustment amount of the calculation unit 65 calculates a target value of the air damper opening degree, that is, an opening degree of the air damper 30a that is adapted to the reference oxygen concentration, the reference NOx concentration, or the reference c 〇 concentration. 'Control the air damper 3〇a to the target opening degree. Other configurations are the same as those of the above-described first embodiment, and the same members as those of the first embodiment are denoted by the same reference numerals. In the combustion control device for the hearth incinerator 2 of the second embodiment, the combustion control unit 60 adjusts the air damping based on the oxygen concentration detection value of the air mixed with the recirculation gas introduced in the recirculation fan 13 The opening amount of the device 30a controls the amount of air mixed into the air-mixed recirculation gas so that the oxygen concentration of the air-mixed recirculation gas becomes equal to or higher than a predetermined allowable minimum oxygen concentration. Therefore, even if oxygen in the recirculating gas is received 118513.doc -25- 1331201 The consumption causes the oxygen concentration to become too small, and the amount of air can be increased by increasing the opening degree of the air damper 3〇a, and is stable under the above-mentioned allowable minimum oxygen concentration. combustion. Further, by adjusting the opening degree of the air damper 3〇a by the combustion control mechanism 60, the NOx concentration in the combustion exhaust gas can be kept below the allowable maximum enthalpy concentration, and the combustion exhaust gas can be c〇 The concentration is kept below the maximum allowable CO concentration to promote purification of the exhaust. [THIRD EMBODIMENT] Fig. 7 is a structural circle of a hearth type incinerator according to a third embodiment of the present invention, and Fig. 8 is a view showing selection of the oxygen concentration and the temperature of the air mixed recycle gas in the third embodiment. Flow chart of combustion control. The third embodiment of the present invention is the one shown in Figs. 1 to 3! The embodiment and the second embodiment shown in Figs. 4 to 6 are combined. That is, in the third embodiment, the combustion control means 6A is used to determine the temperature detection value of the recirculation gas based on the air from the temperature sensor 35a (or the temperature sensor 35 in Fig. 1). Adjusting the opening degree of the air damper 3〇a to control the amount of air mixed into the air mixed recirculation gas so that the temperature of the two-gas mixed recirculation gas becomes below a predetermined allowable maximum temperature, and according to detecting the air The oxygen concentration detection value of the oxygen concentration meter 37 of the oxygen concentration in the mixed gas is calculated, and the opening degree of the air damper 30a in which the oxygen concentration of the air-mixed recirculation gas is equal to or higher than a predetermined allowable minimum oxygen concentration is calculated. The opening degree of the air damper 3〇a is controlled to the opening degree calculated value. Further, in the third embodiment, as in the second embodiment, a concentration sensor 38 for detecting the concentration of germanium in the combustion exhaust gas is provided on the outlet side of the secondary combustion chamber 4 at a temperature of 118513.doc -26-1331201, And measuring the CO concentration c〇 concentration sensor %, and calculating the concentration in the combustion exhaust gas based on the NOx concentration sensor 382 Ν〇χ concentration detection value and the CO concentration detection value from the c 〇 concentration sensor 39 When the c〇 concentration in the combustion exhaust gas is equal to or lower than the preset target C0 concentration, the opening degree of the air damper 3〇a is set to be equal to or lower than the preset target enthalpy concentration, and the air damper 3〇a is opened. The degree control calculates a value for the opening degree. The other structures are the same as those in the first embodiment described above, and the same members as those in the first embodiment are denoted by the same reference numerals. Fig. 8 is a flow chart showing the combustion control performed in accordance with the oxygen concentration and the temperature of the air-mixed recirculation gas in the third embodiment, and the combustion control is performed in the following order. That is, the oxygen/density Cg of the air mixed recycle gas is detected by the oxygen concentration meter 37 (step (1)), and the oxygen concentration detected value Cg is compared with the target oxygen concentration cg ( (step (2)), When the oxygen concentration Cg is greater than the target oxygen concentration Cg〇 (Cg>Cgo), the air damper 30a is turned off to reduce the amount of air (step (3)), and when the oxygen concentration Cg is less than the target oxygen concentration Cgo (Cg < Cg〇) is turned on The air damper 30a increases the amount of air (step (4)). Then, after the opening control of the air damper 3 〇 & according to the oxygen concentration, the opening degree control of the air damper 30a is performed in accordance with the temperature of the air mixed recirculation gas in the following order. That is, 'the temperature Tg of the air mixed recirculation gas is detected by the temperature sensor 35a (or the temperature sensor 35 in FIG. 1) in FIG. 8 (step (5)) 'the temperature detection value Tg Compared with the target temperature Tgo (step 118513.doc -27-(6)), when the temperature detection value Tg is equal to the target temperature Tgo, the opening degree of the air damper 30a is maintained, and when the temperature detection value Tg is high At 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) The air damper 30a is closed to reduce the amount of air, and the temperature Tg of the air mixed recirculation gas is raised (step (8)). According to the third embodiment of the present invention, the multiplication effect of the first embodiment and the second embodiment can be obtained. In the combustion control device of the hearth incinerator 2 of the third embodiment, (1) the combustion control unit 60 adjusts the temperature detection value of the recirculated gas according to the air introduced in the recirculation fan 13 The opening degree of the air damper 30a controls the amount of air mixed into the air mixed recirculation gas so that the temperature of the air mixed recirculation gas becomes equal to or lower than a predetermined allowable maximum temperature, and therefore, even for some reason When the temperature of the circulating gas rises, the amount of air may be increased in accordance with the increase in temperature, and the temperature of the air-mixed recirculating gas sucked by the recirculating fan 13 may be appropriately maintained below the allowable maximum temperature. Thereby, it is possible to prevent overheating of the recirculation fan 13 caused by the above-described air-mixed recirculation gas, and it is possible to maintain high durability without using a high-cost fan composed of a special heat-resistant material for the recirculation fan 13. (2) The combustion control mechanism 60 adjusts the opening degree of the air damper 30a based on the oxygen concentration detection value of the air-mixed recirculation gas introduced in the recirculation fan 13, and controls the air mixed in the air-mixed recirculation gas. 118513.doc -28 - 1331201 f ': The oxygen concentration of the air mixed recycle gas is changed to be equal to or higher than the preset minimum oxygen concentration, so that even if the oxygen in the recycle gas is consumed, the oxygen concentration becomes too small. The crucible can increase the amount of air by increasing the opening degree of the air damper 3〇a, and perform stable combustion under the conditions of the above-mentioned minimum oxygen concentration.

Further, by adjusting the opening degree of the air damper by the combustion control mechanism 6G, the concentration in the combustion exhaust gas can be kept at the maximum allowable concentration, and the concentration of the (7) in the combustion exhaust gas is always kept at the maximum. Below the CO concentration, the purification of the exhaust gas can be promoted. [Fourth Embodiment] Fig. 9 is a configuration diagram of a hearth incinerator according to a fourth embodiment of the present invention, and Fig. 10 is a flowchart of a combustion control in the fourth embodiment. According to the fourth embodiment of the present invention, in addition to the third embodiment, the suction passage (recirculation gas passage) 31 through which the air-mixed recirculation gas flows is provided with gas damping for adjusting the flow rate of the air-mixed recirculation gas. 013, the air mixed recycle gas system supplies air to the secondary combustion chamber 4 by mixing the air into the recycle gas; and detects the air mixed recycle gas by the mixed gas flow meter 90 provided in the recirculation passage 15. The flow rate' is then controlled by the combustion control mechanism 60 to control the opening degree of the gas damper 根据3 based on the flow rate detection value of the air mixed recirculation gas from the gas flow meter so that the flow rate of the recirculation gas becomes preset The target flow rate 0, that is, the steps (1) to (8) in Fig. 10 are the same as those in the above-described third embodiment shown in Fig. 8. Il8513.doc -29- In Fig. 10, the flow control value Qg of the air mixed recirculation gas from the mixed gas flow meter 90 is compared with the preset target flow rate Qgo by the combustion control means 60 (step (9)). When the flow rate detection value (^ is greater than the target flow rate Qg ( (Qg > Qgo), the gas damper 〇 13 is turned off (strictly speaking, the opening degree is decreased) (step (1 〇)) 'When the above-described flow rate detection value Qg When the target flow rate Qg 小于 is less than (Qg < Qg 〇) 'Open the gas damper 〇 13 (strictly speaking, increase the opening degree) (step (11)), thereby controlling the flow rate of the air mixed recirculation gas to make it Therefore, the amount of the air mixed recirculation gas as the secondary air can be stably maintained 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 ' When the air is mixed with the amount of the complete combustion of the recirculating gas, the combustion state can be averaged to maintain stable combustion. In the fourth embodiment of the present invention, the secondary combustion chamber 4 is disposed at a plurality of positions on the right and left sides. There are recirculating gas blowing nozzles 19a and 19c and recirculating gas blowing nozzles 19b and 19d, and respective recirculating gas passages 17 connected to the recirculating gas blowing nozzles 19a and 19c and the recirculating gas blowing nozzles 19b and 19d. 18 is provided with a branch gas damper B33 and a branch gas damper A32 for adjusting the flow rate of the air mixed recirculation gas, and the recirculating gas blowing nozzles i9a, 19c and the recirculating gas of the air mixed with the recirculating gas in the secondary combustion chamber 4 A gas pressure sensor B42 that detects a pressure (hereinafter referred to as a recirculation gas pressure) and a gas pressure sensor A41 are provided in the vicinity of the blowing nozzles 19b and 19d. In the fourth embodiment, the combustion is performed. Control mechanism 60, root 118513.doc • 30· 1331201 According to the gas pressure sensor B42 from the right and left of the secondary combustion chamber 4 (2 on the left side, 2 on the right side), and the sense of gas and body pressure The detected value of the gas pressure of the detector A41 is calculated as the opening degree of each of the branch gas dampers B33 and the branch gas dampers A32 that cause the gas pressure at the plurality of points to be a predetermined target pressure, and the branch gas dampers are The opening degree of B33 and the branch gas damper A32 is controlled to be a calculated value. That is, in Fig. 10, the gas pressure sensor B42 and the gas pressure sense are compared by the combustion control mechanism 60. The gas pressure detection value pg of the detector A41 and the preset target gas pressure Pgo (step (12) in Fig. 1). When the gas pressure detection value Pg is greater than the target gas pressure Pgo (pg > Pgo), the branch gas is turned off. The damper B33 and the branch gas damper A32 (strictly speaking, the opening degree is reduced) (step (13)), thereby reducing the toward the recirculation gas blowing nozzles 19a, 19c and the recirculating gas blowing nozzles 191), 19d Air is mixed with the amount of recycle gas. When the gas pressure detection value Pg is smaller than the target gas pressure pg0 (Pg < Pg 〇) 'open branch gas, the damper B33 and the branch gas damper 八32 (strictly speaking, the system is increased in opening degree) (step (14)) Thereby, the amount of the recirculated gas mixed into the air of the recirculation gas blowing nozzles 19a and 19c and the recirculation gas blowing nozzles 191) and i9d is increased. Since the combustion control device of the hearth type incinerator 2 of the fourth embodiment is configured as described above, it is possible to detect the vicinity of the recirculation gas blowing nozzle by using the relationship between the amount of the recirculated gas and the pressure of the recirculation gas. The recirculation gas pressure 'and controls the opening degree of the branch gas damper B33 and the branch gas damper A32' to change the recirculation gas pressure pg to the target 118513.doc 31 1331201 standard gas pressure Pg 〇 'by this' The amount of the air-recirculating nuclear gas as the secondary air can be stably maintained as the amount at which the air-mixed recirculating gas can be completely burned, so that the combustion state can be averaged to maintain stable combustion. Further, the detection value of the above gas pressure based on the gas pressure sensor B42 and the gas waste force sensor A41 from the right and left complex points (2 on the left side and 2 on the right side) disposed oppositely to the secondary combustion chamber 4 The opening degrees of the branch gas dampers B33 and the branch gas dampers A32 are calculated, and the opening degrees of the branch gas dampers B33 and the branch gas dampers A32 are controlled to a calculated value so that the gas pressure at the plurality of points becomes a predetermined value. Since the target pressure is set, it is possible to freely adjust the air mixed with the recirculation gas to the recirculated gas blowing nozzles 19a and 19c and the recirculating gas blowing nozzles 191) and i9d provided in the plurality of secondary combustion chambers 4: The distribution 'is uniformly mixed the air into the recirculating gas in the circumferential direction of the combustion chamber, so that the combustion can be averaged. The embodiment of the present invention has been described in detail above. However, the present invention is not limited to the embodiment, and various modifications and changes can be made in accordance with the technical idea of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the configuration of a hearth type incinerator according to a first embodiment of the present invention. Fig. 2 is a view showing a schematic configuration of a combustion control mechanism in the first embodiment. Fig. 3 is a view showing a combustion control block of the first embodiment. Fig. 4 is a structural view showing a hearth type incinerator according to a second embodiment of the present invention. -32. 118513.doc 1331201 Fig. 5 is a view showing a schematic configuration of a combustion control mechanism in the second embodiment. Fig. 6 is a view showing a combustion control block of the second embodiment. Fig. 7 is a structural view showing a hearth type incinerator according to a third embodiment of the present invention. Fig. 8 is a flow chart showing the combustion control of the third embodiment. Fig. 9 is a structural view showing a hearth type incinerator according to a fourth embodiment of the present invention.

Fig. 1 is a flow chart showing the combustion control of the fourth embodiment.

[Main component symbol description] 1 2 3 4 5 6 7,54,55,56 8 12 13 013 14 15 , 16 , 17 , 18 19a , 19b , 19c , 19d Garbage feed hopper hearth incinerator primary combustion chamber 2 Secondary combustion chamber primary air main fan fan opening and closing damper ash storage tank cyclone recirculation fan gas damper mixed gas passage recirculation passage recirculation gas blowing nozzle 118513.doc -33· 1331201

21 Drying belt hearth 22 Main combustion belt hearth 23 Rear combustion belt hearth 30 Mixing air passage 30a Air damper 31 Suction channel 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 ΝΟχ concentration sensor 39 CO concentration sensor 40 Recirculation gas extraction port 41 Gas pressure sensor A 42 Gas pressure sensor B 51 ' 52 ' 53 Primary air tube 60 Fuel control unit 61 Temperature comparison unit 62 Reference gas temperature setting unit 63 Gas temperature/air amount setting unit 64, 77' 79, 81 Air amount adjustment amount calculation unit 65 Air damper opening degree adjustment amount calculation unit 66 Air Damper opening degree calculation unit 118513.doc 34- 1331201 71 Oxygen concentration comparison unit 72 Reference oxygen concentration setting unit 73 NOx concentration comparison unit 74 Reference enthalpy concentration setting unit 75 CO concentration comparison unit 76 Reference CO concentration setting unit 78 Oxygen concentration/air Quantity setting unit 80 ΝΟχ concentration/air amount setting unit 82 CO concentration/air amount setting unit 90 Mixed gas flow meter 600 air Damper opening calculation mechanism 118513.doc -35-

Claims (1)

1331201 Patent Application No. 096105390 f--------------, Replacement of Chinese Patent Application ("July of July) Repair of Eight Days (More) Zhengli | • Ten Patent application scope: 1.···-----> - 1. A combustion control device for a hearth incinerator, which is configured to introduce air once from the bed of the incineration After performing one combustion in the combustion chamber on the hearth, secondary combustion is performed above the combustion chamber, and a part of the combustion gas in the combustion chamber is mixed and extracted, and the air supplied through the air passage is mixed. The air-mixed recirculation gas is supplied to the furnace via a recirculation passage by a fan, wherein the air passage is provided with an air flow/quantity adjustment mechanism for adjusting the air flow rate, and the gas concentration detection is provided on the other hand. a mechanism and a combustion control mechanism, wherein the gas concentration detecting means detects a gas concentration of the air-mixed recirculation gas, and the combustion control means inputs the air mixture from the gas concentration detecting means a gas concentration detection value of the circulating gas, and calculating, according to the gas concentration detection value, a channel area of the air flow rate adjusting mechanism in which a gas concentration of the air mixed recirculation gas is a predetermined target gas concentration, and controlling the air flow rate adjusting mechanism The above channel area is calculated. 2. The combustion control device for a hearth type incinerator according to claim 1, wherein a NOx concentration detecting mechanism for detecting a NOx concentration in the combustion exhaust gas and a CO concentration detecting mechanism for detecting a CO concentration in the combustion exhaust gas are provided, and The combustion control unit is configured to calculate the air based on the gas concentration detection value input from the gas concentration detecting means, the radon concentration detection value input from the radon concentration detecting means, and the CO concentration detection value input from the CO concentration detecting means. The gas concentration of the mixed recycle gas becomes a predetermined target gas concentration, and the concentration in the above-mentioned combustion exhaust gas is 118513-990714.doc 1331201 The degree of passage is equal to or smaller than a predetermined target NOx concentration, and the CO concentration of the combustion exhaust gas is equal to or lower than a predetermined target CO concentration, and the air flow rate adjustment mechanism is controlled by the channel area. value. 3. A combustion control device for a hearth type incinerator, which is configured to introduce primary air from below a hearth into which an incineration is introduced, and to perform combustion once on the combustion chamber of the hearth, above the combustion chamber Performing secondary combustion, and mixing and withdrawing a portion of the combustion gas in the combustion chamber and the air supplied through the air passage, and the air-mixed recirculation gas is supplied to the furnace through the recirculation passage by the fan. The air passage is provided with an air flow adjusting mechanism for adjusting an air flow rate, and a temperature detecting mechanism, a gas concentration detecting mechanism and a combustion control mechanism are provided, and the temperature detecting mechanism detects the air mixed recirculating gas. The gas concentration detecting means detects a gas concentration of the air-mixed recirculation gas, and the combustion control means inputs a temperature detection value of the air-mixed recirculation gas from the temperature detecting means and a gas concentration detecting means from the gas concentration detecting means. ® Gas of the above air mixed recycle gas The degree detection value is calculated based on the temperature detection value and the gas concentration detection value, and the temperature of the air-mixed recirculation gas is set to a predetermined target temperature, and the gas concentration of the air-mixed recirculation gas is a predetermined target gas concentration. The passage area of the air flow adjusting mechanism, and the air flow adjusting mechanism is controlled to the channel area calculated value. 4. A combustion control device for a hearth incinerator, which is constructed as a self-injection 118513-990714.doc 1331201:7?曰修曰(更}正木丨I_ _ | Introduced once under the hearth of the incinerator, after a combustion in the combustion chamber on the hearth, secondary combustion is carried out above the combustion chamber, and the mixture is extracted a part of the combustion gas in the combustion chamber and the air supplied through the air passage are supplied to the furnace through the recirculation passage by the fan, wherein the air is mixed with the recirculation gas. a recirculation gas flow regulating mechanism for adjusting an air mixed recirculation gas flow rate, wherein the air mixed recirculation gas system mixes air into the recirculation gas to supply to the combustion chamber; and a gas flow meter and a combustion control mechanism are provided, wherein the gas flow meter detects a flow rate of the air mixed recirculation gas, and the combustion control mechanism calculates the recirculation based on a flow rate detection value of the recirculation gas input from the gas flow meter. The flow of gas becomes the above-mentioned recirculated gas flow at a predetermined target flow rate The channel area of the volume adjustment mechanism is controlled, and the above-mentioned recirculation gas flow rate adjustment mechanism is controlled to the channel area calculation value. 5. The combustion control device of the hearth type incinerator according to claim 4, wherein the plurality of combustion chambers are disposed at a plurality of places a recirculation gas outlet, and a plurality of the recirculation gas passages connected to the respective recirculation gas outlets, and a recirculation gas flow adjustment mechanism for adjusting an air mixed recirculation gas flow rate in each of the recirculation gas passages, corresponding to The recirculating gas flow rate adjusting means is provided with the combustion chamber pressure detecting means for detecting the pressure of the combustion chamber, and the combustion control means is configured to calculate the combustion chamber pressure detecting value from the plurality of combustion chamber pressure detecting means. The combustion chamber pressure at a plurality of places becomes a preset target 118513-990714.doc 1331201 The passage area of each of the above-described recirculation gas flow rate adjusting mechanisms of the standard pressure, and the respective recirculation gas flow rate adjusting means is controlled to the channel area calculated value. 118513-990714.doc