Furnace combustion control device and method

Abstract

To provide a combustion control device for a furnace capable of appropriately controlling an amount of air blown into a section where secondary combustion is performed in a furnace.SOLUTION: A combustion control device 15 for a furnace for controlling an amount of air blown into a section 13 where secondary combustion is performed in a furnace 3, comprises: adjustment units 16a, 16b that adjust an amount of air blowing from blowing units 14a, 14b that blow air into the section 13; a measurement device 17 that measures concentration distribution of at least first gas in the furnace 3 and concentration distribution of second gas different from the first gas; and a control device 18 that controls the adjustment units 16a, 16b based on at least the overlapping between the concentration distribution of the first gas and the concentration distribution of the second gas.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a furnace combustion control device and method for controlling the amount of air blown into a section of a furnace where secondary combustion takes place. [Background technology]

[0002] For example, a primary combustion chamber is provided above the grate of a stoker-type incinerator, and a compartment where secondary combustion takes place is provided above the primary combustion chamber. Air is blown into this compartment from an air blowing nozzle or other blowing section to combust unburned fuel contained in the exhaust gas. Such a compartment where secondary combustion takes place is provided not only in stoker-type incinerators, but also in fluidized-bed incinerators and ash melting furnaces.

[0003] The injection rate of the injection section is controlled by a combustion control device. As a conventional combustion control device, Patent Document 1 discloses a combustion control device that measures the concentration distribution of carbon monoxide or oxygen in a furnace and controls the injection rate of the injection section based on the concentration distribution of carbon monoxide or oxygen.

[0004] Patent Document 2 discloses a combustion control device that divides the section of the furnace where secondary combustion takes place into many small segments, installs an injection section, an oxygen concentration meter, and a thermometer in each section, and controls the injection amount from the injection section based on the oxygen concentration and temperature for each section. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 63-311020 [Patent Document 2] Japanese Patent Application Publication No. 4-203802 Summary of the Invention [Problem to be solved by the invention]

[0006] As with the combustion control device of Patent Document 1, it is possible to determine areas where the carbon monoxide or oxygen concentration is high and areas where it is low by measuring the concentration distribution of carbon monoxide or oxygen in the furnace. However, with the combustion control device of Patent Document 1, for example, it is not possible to determine whether the oxygen concentration is high in an area where the carbon monoxide concentration is high, which causes a problem in that the amount of air blown in cannot be appropriately controlled.

[0007] Specifically, for example, in an area where the carbon monoxide concentration is high and the oxygen concentration is low, incomplete combustion occurs due to a lack of oxygen, so the amount of air injection needs to be increased. On the other hand, in an area where the carbon monoxide concentration is high and the oxygen concentration is high, incomplete combustion occurs due to excessive injection, so the amount of air injection needs to be reduced. The combustion control device in Patent Document 1 cannot distinguish whether incomplete combustion occurs due to a lack of oxygen or excessive injection, so it cannot appropriately control the amount of air injection.

[0008] Even if the section where secondary combustion is performed is divided into many segments each made up of a small section, as in the combustion control device of Patent Document 2, the above problems cannot be solved.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a furnace combustion control device and method that can appropriately control the amount of air blown into the section of the furnace where secondary combustion takes place. [Means for solving the problem]

[0010] In order to solve the above problems, one aspect of the present invention is a combustion control device for a furnace that controls the amount of air to be blown into a section of the furnace where secondary combustion is performed, the device comprising: an adjusting unit that adjusts the blowing amount of an air blowing unit that blows air into the section; and a measuring device that measures the concentration distribution of at least a first gas and a second gas that is different in type from the first gas in the furnace. before a control device for controlling the adjusting unit; The control device grasps the region where the concentration of the first gas is high and the region where the concentration of the second gas is low, and also grasps the region where the concentration of the second gas is high and the region where the concentration of the second gas is low, and determines whether or not at least one of a region where the concentration of the first gas is high and the concentration of the second gas is high, a region where the concentration of the first gas is high and the concentration of the second gas is low, a region where the concentration of the first gas is low and the concentration of the second gas is high, or a region where the concentration of the first gas is low and the concentration of the second gas is low occurs, and controls the adjustment unit based on the determination result. This is a combustion control device for a furnace.

[0011] Another aspect of the present invention is a method for controlling combustion in a furnace, which controls the amount of air to be blown into a section of the furnace where secondary combustion is performed, the method comprising measuring a concentration distribution of at least a first gas and a concentration distribution of a second gas different from the first gas in the furnace; A region where the concentration of the first gas is high and a region where the concentration of the second gas is low are identified, and a region where the concentration of the first gas is high and a region where the concentration of the second gas is low are identified. Then, it is determined whether or not at least one of a region where the concentration of the first gas is high and the concentration of the second gas is high, a region where the concentration of the first gas is high and the concentration of the second gas is low, a region where the concentration of the first gas is low and the concentration of the second gas is high, or a region where the concentration of the first gas is low and the concentration of the second gas is low is identified. This is a furnace combustion control method for controlling the amount of air blown into the compartment based on the above. [Effects of the Invention]

[0012] According to the present invention, the amount of air blown into the section of the furnace where secondary combustion takes place can be appropriately controlled. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a vertical cross-sectional view of an incinerator equipped with a furnace combustion control device according to one embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing a measurement device and is a horizontal cross-sectional view of a secondary combustion chamber. [Figure 3] FIG. 2 is a schematic diagram showing a light path p and a grid q. [Figure 4] Figure 4(a) shows a two-dimensional image of the carbon monoxide concentration distribution displayed on the display of the analysis device, and Figure 4(b) is a schematic diagram showing areas of high and low carbon monoxide concentration as determined by the control device. [Figure 5] FIG. 2 is a schematic diagram showing the overlap of the concentration distribution of carbon monoxide and the concentration distribution of oxygen. [Figure 6] 4 is a flowchart of a program executed by the control device. [Figure 7] FIG. 1 is a matrix diagram showing the relationship between carbon monoxide concentration, oxygen concentration, and temperature. [Figure 8] 4 is a flowchart of a program executed by the control device. [Figure 9] 4 is a flowchart of a program executed by the control device. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can be embodied in various forms and is not limited to the embodiments described herein. The present embodiments are provided with the intention that those skilled in the art will be able to fully understand the invention by fully disclosing the specification.

[0015] 1 shows a longitudinal cross-sectional view of an incinerator equipped with a furnace combustion control device 15 according to one embodiment of the present invention. The incinerator includes a hopper 2 into which waste is fed, a stoker furnace 3 that combusts the waste W supplied from the hopper 2 while stirring and moving the waste W forward, and a boiler 4 that exchanges heat with the exhaust gas discharged from the stoker furnace 3 to generate steam.

[0016] A drying grate 5a, a combustion grate 5b, and a post-combustion grate 5c are provided at the bottom of the stoker furnace 3. The drying grate 5a is located on the hopper 2 side. The combustion grate 5b is located downstream of the drying grate 5a. The post-combustion grate 5c is located downstream of the combustion grate 5b. A primary combustion chamber 6 is provided above the drying grate 5a, the combustion grate 5b, and the post-combustion grate 5c.

[0017] In the drying grate 5a, the waste W is dried and ignited. In the combustion grate 5b, the waste W is pyrolyzed and partially oxidized. In the combustion grate 5b, the combustible gas and solids generated by pyrolysis are combusted to form a flame. In the post-combustion grate 5c, the unburned portion of the waste W is placed and burned. The combustion ash after the placement and combustion is discharged from the ash drop port 7.

[0018] Wind boxes 8a, 8b, and 8c are provided below the drying grate 5a, combustion grate 5b, and post-combustion grate 5c. Primary air pipes 9a, 9b, and 9c are connected to the wind boxes 8a, 8b, and 8c. A blower 11 and a damper 12 for adjusting the flow rate are provided in the primary air main pipe 10. Compressed air from the blower 11 passes through the primary air main pipe 10 and is then supplied to the grates 5a, 5b, and 5c via the primary air pipes 9a, 9b, and 9c.

[0019] A section where secondary combustion takes place (i.e., secondary combustion chamber 13) is provided above the primary combustion chamber 6. Air is blown into the secondary combustion chamber 13 from blowing sections 14a, 14b, such as air blowing nozzles. Multiple blowing sections 14a, 14b are provided. For example, blowing sections 14a, 14b are provided on the drying grate 5a side and the post-combustion grate 5c side of the secondary combustion chamber 13. The arrangement of blowing sections 14a, 14b is not limited thereto, and they may be provided, for example, on the front and rear sides of the secondary combustion chamber 13 as viewed from the paper. The number of blowing sections 14a, 14b is also not limited thereto, and may be set to two, four, or various other numbers. For example, two or more blowing sections may be provided on each side of the secondary combustion chamber 13. Furthermore, blowing sections 14a, 14b may be arranged offset vertically, or may be arranged at two or more levels above and below.

[0020] The injection amounts of the injection sections 14a and 14b are controlled by a combustion control device 15. The combustion control device 15 includes adjustment sections 16a and 16b, a measuring device 17, and a control device 18. The configuration of the combustion control device 15 will be described later.

[0021] A boiler 4 is provided at the exhaust gas outlet of the secondary combustion chamber 13. The boiler 4 generates steam by heat exchange with the exhaust gas discharged from the secondary combustion chamber 13. A flue 19 is provided at the outlet of the boiler 4. Downstream of the flue 19 are provided a cooling tower (not shown) for lowering the temperature of the exhaust gas, an exhaust gas treatment device (not shown) for detoxifying the exhaust gas using hydrated lime, activated carbon, etc., a dust removal device (not shown) for removing fly ash from the exhaust gas, and a chimney (not shown) for releasing the exhaust gas into the atmosphere.

[0022] The following describes the configuration of the combustion control device 15. The combustion control device 15 includes adjustment units 16a and 16b that adjust the injection rates of the injection units 14a and 14b, a measurement device 17 that measures at least the carbon monoxide concentration distribution and the oxygen concentration distribution in the stoker furnace 3, and a control device 18 that controls the adjustment units 16a and 16b based on at least the overlap of the carbon monoxide concentration distribution and the oxygen concentration distribution.

[0023] The adjustment units 16a, 16b are, for example, dampers, and are provided corresponding to each of the blowing units 14a and 14b. The adjustment units 16a, 16b adjust the overall blowing amount of the blowing units 14a, 14b and change the distribution of the blowing amounts of the blowing units 14a, 14b. A secondary air pipe 21 provided downstream of the blower 20 for supplying secondary air branches off midway. The secondary air pipe 21a is connected to the adjustment unit 16a. The secondary air pipe 21b is connected to the adjustment unit 16b.

[0024] The irradiation means 23 and light receiving means 24 of the measurement device 17 are disposed, for example, downstream of the blowing sections 14a and 14b. The position of the measurement device 17 is not limited to downstream of the blowing sections 14a and 14b, but may be disposed, for example, upstream. The measurement device 17 uses absorption spectroscopy using laser light and CT (Computed Tomography) to determine the carbon monoxide concentration distribution, oxygen concentration distribution, and gas temperature distribution. Absorption spectroscopy and CT will be described later.

[0025] 2 shows a horizontal cross section of secondary combustion chamber 13. Measuring device 17 includes irradiation means 23 that irradiates the interior of secondary combustion chamber 13 with laser light, light receiving means 24 that receives the laser light that has passed through secondary combustion chamber 13, and analyzer 25 that determines the concentration distribution of carbon monoxide and oxygen based on the electrical signal output by light receiving means 24.

[0026] The irradiation means 23 includes a laser oscillator 26, a branching filter 27, and a laser irradiator 28. The laser oscillator 26 includes a laser that outputs laser light in the wavelength region of the carbon monoxide absorption band, and a laser that outputs laser light in the wavelength region of the oxygen absorption band. These lasers are controlled by a laser control device (not shown), and output laser light in a predetermined wavelength region. The branching filter 27 branches the laser light from the laser oscillator 26 into multiple optical paths and outputs the laser light.

[0027] The laser irradiator 28 is a collimator (lens) or the like for adjusting the traveling direction of the laser light, and causes the laser light to enter the secondary combustion chamber 13. The laser irradiator 28 and the demultiplexer 27 are connected by an optical fiber.

[0028] The light receiving means 24 includes a receiver 29. The receiver 29 is disposed opposite the laser irradiator 28. The receiver 29 includes a light receiving element such as a photodiode or phototransistor, receives the laser light that has passed through the secondary combustion chamber 13, and outputs an electrical signal corresponding to the intensity of the received laser light. The receiver 29 and the analysis device 25 are connected by wiring that transmits the electrical signal.

[0029] The analyzer 25 is composed of a computer and the like. The analyzer 25 amplifies the electrical signal from the receiver 29 using an amplifier, and analyzes the waveform (absorption spectrum) of the amplified signal using absorption spectroscopy and CT to determine the concentration distribution of carbon monoxide, the concentration distribution of oxygen, and the temperature distribution of the gas. Note that the temperature distribution usually does not differ depending on the type of gas. In practice, the temperature distribution of the gas is measured using a third gas (water vapor or carbon dioxide).

[0030] Absorption spectroscopy and CT are explained below. Absorption spectroscopy is a measurement method that utilizes the property that when a laser beam of a certain wavelength is irradiated onto the gas to be measured, certain gas molecules contained in the gas to be measured absorb the laser beam of a specific wavelength, and the property that the amount of absorption depends on the concentration and temperature. The intensity of the incident light (I λ0 ) and transmitted light intensity (I λ ) ratio (I λ / I λ0 ) can be used to measure the concentration and temperature of the target gas. λ / I λ0 is expressed by the following relational expression (1) according to the Lambert-Beer formula:

number

[0031] When laser light is irradiated onto a gas, the absorbance A at each optical path p isλ is expressed by the following relational expression (2).

number

[0032] where A λ,p is the absorbance at light path p, n q is the molecular number density at grid q, L p,q is the optical path length in the p direction through the grid q, and α λ,q is the absorption coefficient at grid q. The optical path p and grid q are set as shown in Figure 3.

[0033] According to equation (2), the absorbance A for a certain wavelength λ,p is the concentration n of the gas to be measured and the absorption coefficient α λ,q and the optical path length L. Since the optical path length L is known, the gas concentration n and absorption coefficient α for each of the multiple grids q included in each optical path p can be calculated. λ,q If we know the absorbance A for each light path p, λ,p Here, the absorption coefficient α λ,q is a function of temperature. Therefore, if the gas concentration n and temperature T of each of the multiple grids q included in each optical path p are known, the absorbance A λ,p is required.

[0034] Assuming the initial concentration and temperature, the actual measured value ((A λ,q ) data , absorbance data) and theoretical value ((A λ,q ) theory The concentration and temperature at each grid point are converged so that the error in the above equation is minimized. This allows the gas concentration n and temperature T at each grid point q to be calculated, and the concentration and temperature distributions of the target gas can be determined.

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[0035] The concentration and temperature distributions of the measurement target gas may be obtained in two dimensions or three dimensions. Furthermore, the concentration and temperature distributions of the measurement target gas may be obtained using a method other than absorption spectroscopy and CT.

[0036] 4(a) shows a two-dimensional image of the carbon monoxide concentration distribution displayed on the display of the analysis device 25. The data on the carbon monoxide concentration distribution, oxygen concentration distribution, and temperature distribution obtained by the analysis device 25 are input to the control device 18 (see FIG. 1) via a communication line.

[0037] The control device 18 is composed of a computer or the like. Based on the carbon monoxide concentration distribution data input from the analysis device 25, the control device 18 identifies areas of high and low carbon monoxide concentration, as shown in the schematic diagram of FIG. 4(b), for example. The areas within the black ellipses in FIG. 4(b) are areas of high carbon monoxide concentration, and the other areas are areas of low carbon monoxide concentration. For example, the control device 18 identifies areas where the carbon monoxide concentration is higher than a predetermined threshold as areas of high carbon monoxide concentration, and areas where the carbon monoxide concentration is lower than the predetermined threshold as areas of low carbon monoxide concentration. In FIG. 4(b), 13 represents a horizontal cross section of the secondary combustion chamber 13, and 14a and 14b represent injection sections. In addition, the control device 18 may compare representative values ​​(maximum value, average value, etc.) of the carbon monoxide concentration distribution in, for example, the area where the blowing section 14a is provided (the lower half of the secondary combustion chamber 13 in Figure 4(b)) and the area where the blowing section 14b is provided (the upper half of the secondary combustion chamber 13 in Figure 4(b)), and determine that the higher value is an area with a high carbon monoxide concentration and the lower value is an area with a low carbon monoxide concentration.

[0038] Similarly, the control device 18 identifies regions with high and low oxygen concentrations based on the oxygen concentration distribution data input from the analysis device 25. Then, it identifies regions with high and low temperatures based on the temperature distribution data.

[0039] Next, the control device 18 determines whether or not at least one of a region where the carbon monoxide concentration distribution and the oxygen concentration distribution overlap (A4 in FIG. 5(b)), a region where the carbon monoxide concentration is high and the oxygen concentration is high (A2 in FIG. 5(a)), a region where the carbon monoxide concentration is low and the oxygen concentration is high (A1 in FIG. 5(a)), or a region where the carbon monoxide concentration is low and the oxygen concentration is low (A3 in FIG. 5(b)), is determined, as shown in the schematic diagrams of FIG. 5(a) and (b).

[0040] When a region where the carbon monoxide concentration is high and the oxygen concentration is low (A2 in FIG. 5(a)) occurs, the control device 18 increases the blowing amount of the blowing section 14a in the region A2 as shown in FIG. 5(a). When a region where the carbon monoxide concentration is high and the oxygen concentration is high (A4 in FIG. 5(b)) occurs, the control device 18 decreases the blowing amount of the blowing section 14a in the region A4 as shown in FIG. 5(b).

[0041] In the region where the carbon monoxide concentration is high and the oxygen concentration is low (A2 in FIG. 5(b)), incomplete combustion occurs due to a lack of oxygen. For this reason, it is necessary to increase the amount of blowing from blowing section 14a. On the other hand, in the region where the carbon monoxide concentration is high and the oxygen concentration is high (A4 in FIG. 5(b)), incomplete combustion occurs due to excessive blowing. For this reason, it is necessary to conversely decrease the amount of blowing from blowing section 14a. According to this embodiment, by controlling the amount of blowing from blowing section 14a based on the overlap between the carbon monoxide concentration distribution and the oxygen concentration distribution, control device 18 can distinguish whether incomplete combustion is occurring due to a lack of oxygen or due to excessive blowing, and the amount of blowing can be appropriately controlled.

[0042] FIG. 6 shows a flowchart of a program executed by control device 18. This program is stored in the storage unit of control device 18. As shown in FIG. 6, control device 18 first determines whether a region with a high carbon monoxide concentration has occurred (S1). If a region with a high carbon monoxide concentration has not occurred, control device 18 does not operate adjustment units 16a, 16b (S2). If a region with a high carbon monoxide concentration has occurred, control device 18 determines whether the oxygen concentration is high or low in the region with a high carbon monoxide concentration (S3). If the oxygen concentration is low in the region with a high carbon monoxide concentration, control device 18 increases the blowing amount of blowing unit 14a (S4). If the oxygen concentration is high in the region with a high carbon monoxide concentration, control device 18 reduces the blowing amount of blowing unit 14a (S5).

[0043] Increasing or decreasing the blowing amount of blowing section 14a results in an increase or decrease in the overall blowing amount (total amount). To prevent this, when increasing the blowing amount of blowing section 14a, the blowing amount of blowing section 14b opposite blowing section 14a can be decreased. Similarly, when decreasing the blowing amount of blowing section 14a, the blowing amount of blowing section 14b can be increased.

[0044] However, increasing or decreasing the blowing rate of blowing section 14b may cause new risks to occur in regions with low carbon monoxide concentrations (A1 in FIG. 5(a) and A3 in FIG. 5(b)). Therefore, when increasing the blowing rate of blowing section 14a in regions with high carbon monoxide concentrations and low oxygen concentrations, as shown on the left side of the matrix diagram in FIG. 7, the blowing rate of blowing section 14b is decreased in regions with low carbon monoxide concentrations and high oxygen concentrations (regions where new risks are unlikely to occur), as shown on the right side of the matrix diagram in FIG. 7. Similarly, when decreasing the blowing rate of blowing section 14a in regions with high carbon monoxide concentrations and high oxygen concentrations, as shown on the left side of the matrix diagram in FIG. 7, the blowing rate of blowing section 14b is increased in regions with low carbon monoxide concentrations and low oxygen concentrations (regions where new risks are unlikely to occur), as shown on the right side of the matrix diagram in FIG. 7.

[0045] This control will be explained in detail using the flowcharts of Figures 8 and 9. As shown in Figure 8, when controller 18 increases the blowing rate of blowing section 14a in a region where the carbon monoxide concentration is high and the oxygen concentration is low (S1 to S3), controller 18 reduces the blowing rate of blowing section 14b in a region where the oxygen concentration is high (S4 to S7), and reduces the blowing rate of blowing section 14b with a second priority in a region where the oxygen concentration is low and the temperature is high (S8 to S9). More specifically, controller 18 reduces the blowing rate of blowing section 14b with a first priority in a region where the oxygen concentration is high and the temperature is low (S7), reduces the blowing rate of blowing section 14b with a second priority in a region where the oxygen concentration is high and the temperature is high (S6), reduces the blowing rate of blowing section 14b with a third priority in a region where the oxygen concentration is low and the temperature is high (S9), and maintains the blowing rate of blowing section 14b in a region where the oxygen concentration is low and the temperature is low (S10).

[0046] 9, when controller 18 reduces the blowing rate of blowing section 14a in a region where the carbon monoxide concentration is high and the oxygen concentration is high (S1-S3), controller 18 increases the blowing rate of blowing section 14b in a region where the oxygen concentration is low (S5-S6). More specifically, controller 18 increases the blowing rate of blowing section 14b in a region where the oxygen concentration is low and the temperature is high (S6) with priority 1, and increases the blowing rate of blowing section 14b in a region where the oxygen concentration is low and the temperature is low (S7) with priority 2. Controller 18 also increases the blowing rate of blowing section 14b in a region where the oxygen concentration is high and the temperature is high (S9) with priority 3, and maintains the blowing rate in a region where the oxygen concentration is high and the temperature is low (S10).

[0047] 8 and 9, the overall blowing amount (total amount) can be kept substantially constant even when the blowing amount of blowing section 14a in the region with high carbon monoxide concentration is increased or decreased. The overall blowing amount (total amount) may be controlled using a representative value of the concentration distribution (for example, a minimum value, an average value, etc.), or may be controlled using a sensor installed downstream of measuring device 17.

[0048] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments and may be embodied in other embodiments without departing from the spirit and scope of the present invention.

[0049] For example, in the above embodiment, the concentration distribution of carbon monoxide and oxygen is measured, but the concentration distribution of other gases such as water vapor and ammonia may also be measured.

[0050] In the above embodiment, an example in which the present invention is applied to a stoker-type incinerator has been described, but the present invention can also be applied to a fluidized bed incinerator, an ash melting furnace, etc. [Explanation of symbols]

[0051] 3...Stoker furnace (furnace) 13...Secondary combustion chamber (compartment where secondary combustion takes place) 14a, 14b...Blowing section 15...Combustion control device 16a, 16b…adjustment section 17...Measuring equipment 18...Control device 23...Irradiation means 24…Light receiving means 25…Analysis device

Claims

1. A combustion control device for a furnace that controls the amount of air blown into a section of the furnace where secondary combustion is performed, an adjusting unit that adjusts the blowing amount of a blowing unit that blows air into the compartment; a measuring device that measures at least a concentration distribution of a first gas and a concentration distribution of a second gas different in kind from the first gas in the furnace; a control device that controls the adjustment unit, the control device grasps a region where the concentration of the first gas is high and a region where the concentration of the second gas is low, A furnace combustion control device that determines whether at least one of a region where the concentration of the first gas is high and the concentration of the second gas is high, a region where the concentration of the first gas is high and the concentration of the second gas is low, a region where the concentration of the first gas is low and the concentration of the second gas is high, or a region where the concentration of the first gas is low and the concentration of the second gas is low occurs, and controls the adjustment unit based on the determination result.

2. A combustion control device for a furnace that controls the amount of air blown into a section of the furnace where secondary combustion is performed, an adjusting unit that adjusts the blowing amount of a blowing unit that blows air into the compartment; a measuring device for measuring at least a carbon monoxide concentration distribution and an oxygen concentration distribution in the furnace; a control device that controls the adjustment unit, The control device grasps regions where the concentration of carbon monoxide is high and regions where the concentration of oxygen is low, A furnace combustion control device that increases the blowing rate of the blowing section in an area where the carbon monoxide concentration is high and the oxygen concentration is low when such an area occurs, and decreases the blowing rate of the blowing section in an area where the carbon monoxide concentration is high and the oxygen concentration is high when such an area occurs.

3. A plurality of the blowing sections and the adjusting sections are provided, 3. The furnace combustion control device according to claim 1, wherein the control device changes the distribution of the blowing amounts so that when the blowing amount of a certain blowing section is increased, the blowing amounts of the remaining blowing sections are decreased.

4. 2. The furnace combustion control device according to claim 1, wherein the first gas is carbon monoxide and the second gas is oxygen.

5. 5. The furnace combustion control device according to claim 4, wherein the control device increases the blowing amount of the blowing section in an area where the carbon monoxide concentration is high and the oxygen concentration is low when such an area occurs, and decreases the blowing amount of the blowing section in an area where the carbon monoxide concentration is high and the oxygen concentration is high when such an area occurs.

6. the measuring device measures a temperature distribution of the gas; The control device grasps high temperature areas and low temperature areas, 6. A furnace combustion control device according to claim 2 or 5, characterized in that when the control device increases the blowing rate of the blowing section in an area where the carbon monoxide concentration is high and the oxygen concentration is low, the control device reduces the blowing rate of the blowing section in an area where the oxygen concentration is high with priority, and then reduces the blowing rate of the blowing section in an area where the oxygen concentration is low and the temperature is high with second priority.

7. the measuring device measures a temperature distribution of the gas; The control device grasps high temperature areas and low temperature areas, 6. The furnace combustion control device according to claim 2 or 5, wherein the control device increases the blowing amount of the blowing section in an area with a low oxygen concentration when reducing the blowing amount of the blowing section in an area with a high carbon monoxide concentration and a high oxygen concentration.

8. the measuring device measures a concentration distribution of the first gas, a concentration distribution of the second gas, and a temperature distribution of the gases; 2. The furnace combustion control device according to claim 1, wherein the control device controls the adjusting unit based on at least the concentration distribution of the first gas, the concentration distribution of the second gas, and the temperature distribution of the gases.

9. The measuring device is an irradiation means for irradiating the interior of the furnace with laser light; a light receiving means for receiving the laser light transmitted through the interior of the furnace; 2. The furnace combustion control device according to claim 1, further comprising an analyzer that determines the concentration distribution of the first gas, the concentration distribution of the second gas, and the gas temperature distribution based on the electrical signal output by the light receiving means.

10. 1. A method for controlling combustion in a furnace, comprising: controlling the amount of air blown into a section of the furnace where secondary combustion is performed, measuring a concentration distribution of at least a first gas and a concentration distribution of a second gas different in kind from the first gas in the furnace; identifying a region where the concentration of the first gas is high and a region where the concentration of the second gas is low, A furnace combustion control method that determines whether at least one of the following occurs: a region where the concentration of the first gas is high and the concentration of the second gas is high; a region where the concentration of the first gas is high and the concentration of the second gas is low; a region where the concentration of the first gas is low and the concentration of the second gas is high; or a region where the concentration of the first gas is low and the concentration of the second gas is low; and controls the amount of air to be blown into the compartment based on the determination result.

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