JP7757864B2 - Furnace combustion control device and method - Google Patents

Description

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

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 compartments where secondary combustion takes place are not only found in stoker-type incinerators, but also in fluidized bed incinerators and ash melting furnaces.

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

Patent Document 2 discloses a combustion control device that divides the furnace's secondary combustion section into multiple segments made up of small compartments, installs an injection section, an oxygen concentration meter, and a thermometer in each section, and controls the injection amount of the injection section based on the oxygen concentration and temperature for each section.

Japanese Unexamined Patent Publication No. 63-311020 Japanese Patent Application Publication No. 4-203802

As with the combustion control device in Patent Document 1, by measuring the distribution of carbon monoxide or oxygen concentrations within the furnace, it is possible to determine areas with high and low carbon monoxide or oxygen concentrations. However, with the combustion control device in Patent Document 1, for example, it is not possible to determine whether the oxygen concentration is high in areas with high carbon monoxide concentrations, which poses the problem of not being able to appropriately control the amount of air being blown in.

Specifically, for example, in areas 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 injected must be increased. On the other hand, in areas 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 injected must be reduced. The combustion control device in Patent Document 1 cannot distinguish whether incomplete combustion is occurring due to a lack of oxygen or excessive injection, so it cannot appropriately control the amount of air injected.

Even if the compartment where secondary combustion occurs is divided into multiple segments made up of small compartments, as in the combustion control device of Patent Document 2, the above problems cannot be solved.

The present invention was 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.

In order to solve the above problems, one aspect of the present invention is a furnace combustion control device that controls the amount of air blown into a section of the furnace where secondary combustion takes place, and includes: an adjustment unit that adjusts the amount of air blown into the section by an air blowing unit that blows air into the section; a measuring device that measures the concentration distribution of at least a first gas and a second gas that is different from the first gas in the furnace; and a control device that controls the adjustment unit.The control device identifies areas of high and low concentration of the first gas, as well as areas of high and low concentration of the second gas, and determines whether at least one of the following areas will occur: an area where the concentration of the first gas is high and the concentration of the second gas is high; an area where the concentration of the first gas is high and the concentration of the second gas is low; an area where the concentration of the first gas is low and the concentration of the second gas is high; or an area where the concentration of the first gas is low and the concentration of the second gas is low; and controls the adjustment unit based on the determination result .

Another aspect of the present invention is a furnace combustion control method for controlling the amount of air to be blown into a section of the furnace where secondary combustion is carried out, which measures the concentration distribution of at least a first gas and a second gas different from the first gas within the furnace, identifies areas of high and low concentration of the first gas, and identifies areas of high and low concentration of the second gas, and determines whether at least one of an area where the concentration of the first gas is high and the concentration of the second gas is high, an area where the concentration of the first gas is high and the concentration of the second gas is low, an area where the concentration of the first gas is low and the concentration of the second gas is high, or an area where the concentration of the first gas is low and the concentration of the second gas is low occurs, and controls the amount of air to be blown into the section based on the determination result .

The present invention allows for appropriate control of the amount of air blown into the furnace's secondary combustion section.

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. FIG. 1 is a diagram showing a measurement device and is a horizontal cross-sectional view of a secondary combustion chamber. FIG. 2 is a schematic diagram showing an optical path p and a grid q. 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. FIG. 2 is a schematic diagram showing the overlap of the concentration distribution of carbon monoxide and the concentration distribution of oxygen. 4 is a flowchart of a program executed by the control device. FIG. 1 is a matrix diagram showing the relationship between carbon monoxide concentration, oxygen concentration, and temperature. 4 is a flowchart of a program executed by the control device. 4 is a flowchart of a program executed by the control device.

Embodiments of the present invention will now 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. These embodiments are provided with the intention that the disclosure of the specification will enable those skilled in the art to fully understand the invention.

Figure 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 it forward, and a boiler 4 that generates steam by exchanging heat with the exhaust gas discharged from the stoker furnace 3.

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, combustion grate 5b, and post-combustion grate 5c.

The drying grate 5a dries and ignites the waste W. The combustion grate 5b pyrolyzes and partially oxidizes the waste W. In the combustion grate 5b, the combustible gases and solids generated by pyrolysis are combusted, forming a flame. In the post-combustion grate 5c, the unburned waste W is placed and burned. The combustion ash after the placement and combustion is discharged from the ash drop port 7.

Air boxes 8a, 8b, and 8c are installed below the drying grate 5a, combustion grate 5b, and post-combustion grate 5c. Primary air pipes 9a, 9b, and 9c are connected to the air boxes 8a, 8b, and 8c. A blower 11 and a damper 12 for adjusting the flow rate are installed 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.

Above the primary combustion chamber 6, a compartment where secondary combustion takes place (i.e., the secondary combustion chamber 13) is provided. 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 to this; for example, they may be provided on the front and back sides of the secondary combustion chamber 13 as viewed from the paper. The number of blowing sections 14a, 14b is also not limited to this; various numbers, such as two or four, may be used. 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 positioned vertically offset, or may be positioned at two or more levels above and below.

The injection amount of the injection sections 14a and 14b is controlled by the 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.

A boiler 4 is provided at the exhaust gas outlet of the secondary combustion chamber 13. The boiler 4 generates steam by exchanging heat 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 a cooling tower (not shown) for lowering the temperature of the exhaust gas, an exhaust gas treatment device (not shown) that detoxifies the exhaust gas using hydrated lime, activated carbon, etc., a dust removal device (not shown) that removes fly ash from the exhaust gas, and a chimney (not shown) that releases the exhaust gas into the atmosphere.

The configuration of the combustion control device 15 will be described. The combustion control device 15 includes adjustment units 16a and 16b that adjust the injection amount 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 within 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.

Adjustment units 16a, 16b are, for example, dampers, and are provided corresponding to each blowing unit 14a or 14b. Adjustment units 16a, 16b adjust the overall blowing volume of blowing units 14a, 14b and change the distribution of blowing volumes between blowing units 14a, 14b. Secondary air pipe 21, located downstream of blower 20 for supplying secondary air, branches midway. Secondary air pipe 21a is connected to adjustment unit 16a. Secondary air pipe 21b is connected to adjustment unit 16b.

The irradiation means 23 and light receiving means 24 of the measurement device 17 are arranged, 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, and may be arranged, 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.

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

The irradiation means 23 includes a laser transmitter 26, a splitter 27, and a laser irradiator 28. The laser transmitter 26 includes a laser that outputs laser light in the wavelength range of the carbon monoxide absorption band, and a laser that outputs laser light in the wavelength range of the oxygen absorption band. These lasers are controlled by a laser control device (not shown) and output laser light in a predetermined wavelength range. The splitter 27 splits the laser light from the laser transmitter 26 into multiple optical paths for output.

The laser irradiator 28 is a collimator (lens) or the like that adjusts the direction of the laser light, and directs the laser light into the secondary combustion chamber 13. The laser irradiator 28 and the splitter 27 are connected by an optical fiber.

The light receiving means 24 includes a receiver 29. The receiver 29 is positioned 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.

The analysis device 25 is composed of a computer, etc. The analysis device 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 carbon monoxide concentration distribution, oxygen concentration distribution, and gas temperature distribution. Note that the temperature distribution usually does not differ depending on the type of gas. In practice, the gas temperature distribution is measured using a third gas (water vapor or carbon dioxide).

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 a gas to be measured, certain gas molecules contained in the gas to be measured absorb laser beams of a specific wavelength, and the property that the amount of absorption depends on the concentration and temperature. The concentration and temperature of the gas to be measured can be measured by determining the ratio (I _λ /I _λ0 ) of the intensity of the incident light (I _λ0 ) to the intensity of the transmitted light (I _λ ). _{I λ} /I _λ0 is expressed by the following relational expression (1) using the Lambert-Beer formula:
where A _λ is the absorbance, n _i is the number density of molecules present at level i, L is the optical path length, S _i,j (T) is the absorption line intensity, T is the temperature, and G _Vi,j is the broadening function.

When a gas is irradiated with laser light, the absorbance A _λ in each optical path p is expressed by the following relational expression (2).

where A _λ,p is the absorbance at optical path p, n _q is the molecular number density at grid q, L _p,q is the optical path length in the p direction passing through grid q, and α _λ,q is the absorption coefficient at grid q. Optical path p and grid q are set as shown in Figure 3.

According to equation (2), the absorbance A _λ,p for a certain wavelength can be calculated using the concentration n of the gas to be measured, the absorption coefficient α _λ,q , and the optical path length L. Since the optical path length L is known, if the gas concentration n and absorption coefficient α _λ,q are known for each of the multiple grids q included in each optical path p, the absorbance A _λ,p can be calculated for each optical path 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 can be calculated for each optical path p.

By assuming initial concentrations and temperatures and repeatedly calculating using equation (3), the concentration and temperature at each grid point are converged so that the error between the measured values ((A _{λ, q} ) _data , absorbance data) and the theoretical values ((A _{λ, q} ) _theory ) is minimized. This makes it possible to calculate the gas concentration n and temperature T at each grid point q, and to determine the concentration and temperature distributions of the gas to be measured.

The concentration distribution and temperature distribution of the gas to be measured may be determined in two dimensions, or in three dimensions. Furthermore, the concentration distribution and temperature distribution of the gas to be measured may be determined using methods other than absorption spectroscopy and CT.

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

The control device 18 is composed of a computer, etc. 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 Figure 4(b), for example. The areas within the black ovals in Figure 4(b) are areas of high carbon monoxide concentration, and the rest of the area is 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 Figure 4(b), 13 represents a horizontal cross section of the secondary combustion chamber 13, and 14a and 14b represent injection sections. The control device 18 may compare representative values (maximum value, average value, etc.) of the carbon monoxide concentration distribution in the region where the blowing section 14a is provided (the lower half of the secondary combustion chamber 13 in Figure 4(b)) with the region 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 the region where the carbon monoxide concentration is high, and the lower value is the region where the carbon monoxide concentration is low.

Similarly, the control device 18 identifies areas of high and low oxygen concentration based on the oxygen concentration distribution data input from the analysis device 25. It also identifies areas of high and low temperature based on the temperature distribution data.

Next, the control device 18 determines whether the carbon monoxide concentration distribution and the oxygen concentration distribution overlap. Specifically, as shown in the schematic diagrams of Figures 5(a) and 5(b), it determines whether at least one of the following regions occurs: a region where the carbon monoxide concentration is high and the oxygen concentration is high (A4 in Figure 5(b)), a region where the carbon monoxide concentration is high and the oxygen concentration is low (A2 in Figure 5(a)), a region where the carbon monoxide concentration is low and the oxygen concentration is high (A1 in Figure 5(a)), or a region where the carbon monoxide concentration is low and the oxygen concentration is low (A3 in Figure 5(b)).

When a region with high carbon monoxide concentration and low oxygen concentration (A2 in Figure 5(a)) occurs, the control device 18 increases the amount of blowing from the blowing section 14a in region A2, as shown in Figure 5(a). And when a region with high carbon monoxide concentration and high oxygen concentration (A4 in Figure 5(b)) occurs, the control device 18 decreases the amount of blowing from the blowing section 14a in region A4, as shown in Figure 5(b).

In the region where the carbon monoxide concentration is high and the oxygen concentration is low (A2 in Figure 5(b)), incomplete combustion occurs due to a lack of oxygen. For this reason, it is necessary to increase the amount of blowing from the 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 Figure 5(b)), incomplete combustion occurs due to excessive blowing. For this reason, it is necessary to reduce the amount of blowing from the blowing section 14a. According to this embodiment, the control device 18 controls the amount of blowing from the blowing section 14a based on the overlap between the carbon monoxide concentration distribution and the oxygen concentration distribution. This makes it possible to distinguish whether incomplete combustion is occurring due to a lack of oxygen or excessive blowing, and to appropriately control the amount of blowing.

Figure 6 shows a flowchart of a program executed by the control device 18. This program is stored in the memory unit of the control device 18. As shown in Figure 6, the control device 18 first determines whether a high carbon monoxide concentration region exists (S1). If a high carbon monoxide concentration region does not exist, the control device 18 does not operate the adjustment units 16a and 16b (S2). If a high carbon monoxide concentration region exists, the control device 18 determines whether the oxygen concentration is high or low in the high carbon monoxide concentration region (S3). If the oxygen concentration is low in the high carbon monoxide concentration region, the control device 18 increases the blowing amount from the blowing unit 14a (S4). If the oxygen concentration is high in the high carbon monoxide concentration region, the control device 18 decreases the blowing amount from the blowing unit 14a (S5).

Increasing or decreasing the blowing amount of blowing section 14a will result in an increase or decrease in the overall blowing amount (total amount). To prevent this, when increasing the blowing amount of blowing section 14a, simply decrease the blowing amount of blowing section 14b, which faces blowing section 14a. Similarly, when decreasing the blowing amount of blowing section 14a, simply increase the blowing amount of blowing section 14b.

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

This control will be explained in detail using the flowcharts in Figures 8 and 9. As shown in Figure 8, when the control device 18 increases the blowing rate of blowing section 14a in regions where the carbon monoxide concentration is high and the oxygen concentration is low (S1-S3), it prioritizes reducing the blowing rate of blowing section 14b in regions where the oxygen concentration is high (S4-S7) and then reduces the blowing rate of blowing section 14b in regions where the oxygen concentration is low and the temperature is high (S8-S9). More specifically, it reduces the blowing rate of blowing section 14b in regions where the oxygen concentration is high and the temperature is low (S7) with priority 1, reduces the blowing rate of blowing section 14b in regions where the oxygen concentration is high and the temperature is high (S6) with priority 2, reduces the blowing rate of blowing section 14b in regions where the oxygen concentration is low and the temperature is high (S9) with priority 3, and maintains the blowing rate of blowing section 14b in regions where the oxygen concentration is low and the temperature is low (S10).

Furthermore, as shown in the flowchart of Figure 9, when the control device 18 reduces the blowing rate of blowing section 14a in regions where the carbon monoxide concentration is high and the oxygen concentration is high (S1-S3), it increases the blowing rate of blowing section 14b in regions where the oxygen concentration is low (S5-S6). More specifically, in regions where the oxygen concentration is low and the temperature is high, the control device 18 increases the blowing rate of blowing section 14b with priority 1 (S6), and increases the blowing rate of blowing section 14b with second priority 2 in regions where the oxygen concentration is low and the temperature is low (S7). Furthermore, in regions where the oxygen concentration is high and the temperature is high, the control device 18 increases the blowing rate of blowing section 14b with second priority 3 (S9), and maintains the blowing rate in regions where the oxygen concentration is high and the temperature is high (S10).

By using the control shown in Figures 8 and 9, the overall blowing amount (total amount) can be kept approximately constant even when increasing or decreasing the blowing amount from the blowing section 14a in areas with high carbon monoxide concentrations. The overall blowing amount (total amount) may be controlled using a representative value of the concentration distribution (e.g., minimum value, average value, etc.), or may be controlled using a sensor installed downstream of the measuring device 17.

The above describes in detail an embodiment of the present invention. The present invention is not limited to the above embodiment, and may be embodied in other embodiments without departing from the spirit of the present invention.

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.

In the above embodiment, an example was described in which the present invention was applied to a stoker-type incinerator, but the present invention can also be applied to fluidized bed incinerators, ash melting furnaces, etc.

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

Claims (10)

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 . 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 . 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. 2. The furnace combustion control device according to claim 1 , wherein the first gas is carbon monoxide and the second gas is oxygen. The furnace combustion control device described in claim 4, characterized in that when an area with high carbon monoxide concentration and low oxygen concentration occurs, the control device increases the injection rate from the injection section in that area, and when an area with high carbon monoxide concentration and high oxygen concentration occurs, the control device decreases the injection rate from the injection section in that area. 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. 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. 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. 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. 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 .