Boiler control device, boiler control method, and boiler control program

Abstract

To achieve preferable exhaust gas performance even at the time of ammonia mixed fuel combustion by improving space deviation of an air ratio in a furnace.SOLUTION: A boiler control device for controlling a boiler which burns a carbon fuel and ammonia in a furnace includes an index parameter acquisition part, an operation parameter adjustment amount calculation part, and an operation parameter adjustment part. The index parameter acquisition part acquires an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to a plurality of pairs of injection nozzles respectively. The operation parameter adjustment amount calculation part calculates an adjustment amount with respect to at least part of a plurality of operation parameters having correlation with the air ratio in each of the plurality of regions so that the air ratio of each region evaluated based on the index parameter comes close to uniformity. The operation parameter adjustment part adjusts at least part of the plurality of operation parameters based on the adjustment amount.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a boiler control device, a boiler control method, and a boiler control program. [Background technology]

[0002] A large boiler such as a power generation boiler has a hollow furnace that is installed in a substantially vertical direction, and a plurality of burners are disposed on the furnace wall. In addition, in the large boiler, a flue is connected vertically above the furnace, and a heat exchanger for generating steam is disposed in the flue. The burner injects a mixture of fuel and air (oxidizing gas) into the furnace to form a flame, and combustion gas is generated and flows into the flue. A heat exchanger is disposed in the area where the combustion gas flows, and water or steam flowing inside a heat transfer tube that constitutes the heat exchanger is heated to generate superheated steam.

[0003] In this type of boiler, in order to remove nitrogen oxides (NOx) contained in the combustion gas, ammonia (NH3) is supplied to the combustion gas, and the nitrogen oxides are reduced using a catalyst in the presence of ammonia. This denitrification reaction is expressed by the following chemical reaction formula. 4NO+4NH3+O2→4N2+6H2O ···(1) For example, Patent Document 1 discloses an example of a technique for removing nitrogen oxides in exhaust gas from a boiler by a denitration reaction using ammonia. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-228918 A Summary of the Invention [Problem to be solved by the invention]

[0005] In an opposed-fire boiler in which a number of burners are arranged to face each other on the furnace wall, coal fuel (pulverized fuel) produced by pulverizing coal in a pulverized coal mill is supplied to a number of coal-fuel burners through a number of branched conveying paths branched from a main conveying path connected to a coal fuel supply source. The length of these branched conveying paths differs somewhat for each of the coal-fuel burners to which they are connected, for example, depending on the bend pattern. Since coal fuel is a solid powdered fuel, the amount of coal fuel supplied to each of the coal-fuel burners varies somewhat depending on the length of the branched conveying paths. On the other hand, an oxidizing gas (air) mixed with the coal fuel is also supplied to each burner, and gases such as air are distributed relatively evenly even if the length of the conveying path differs. As a result, a spatial deviation of the air ratio occurs in the furnace of the boiler. Such a spatial deviation of the air ratio causes a deviation in the NOx concentration of the exhaust gas at the furnace outlet, which becomes a factor in the deterioration of the boiler performance.

[0006] As described in Patent Document 1, ammonia used in the denitrification reaction for removing nitrogen oxides contained in the combustion gas of the boiler is known to be able to transport and store hydrogen efficiently at low cost. Therefore, in addition to its role as an energy carrier, ammonia can be directly used as a fuel for thermal power generation, and is expected to have a great advantage in reducing greenhouse gas emissions as a fuel that does not emit CO2 when burned. Therefore, development of an ammonia-mixed combustion boiler that mixes coal fuel and ammonia by handling ammonia as a fuel together with coal fuel is underway. According to the inventor's verification, it has been found that the NOx sensitivity to the air ratio during such ammonia-mixed combustion is higher than that during mono-combustion using only coal fuel as fuel. Therefore, in an ammonia-mixed combustion boiler, the spatial deviation of the air ratio in the furnace described above increases the deviation of the NOx concentration in the exhaust gas, which is likely to deteriorate the exhaust gas performance.

[0007] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide a boiler control device, a boiler control method, and a boiler control program that are capable of achieving good exhaust gas performance even during ammonia co-firing by improving the spatial deviation of the air ratio in the furnace. [Means for solving the problem]

[0008] In order to solve the above problems, a boiler control device according to at least one embodiment of the present disclosure includes: In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control device for controlling a boiler in which a plurality of pairs of ejection nozzles, each of which includes at least one of the carbon fuel ejection nozzle or the ammonia ejection nozzle and is arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, an index parameter acquiring unit for acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of ejection nozzles; an operation parameter adjustment amount calculation unit for calculating adjustment amounts for at least a part of a plurality of operation parameters having a correlation with the air ratio in each of the plurality of regions so that the air ratio for each of the plurality of regions evaluated based on the index parameter approaches uniformity; an operation parameter adjustment unit for adjusting at least a part of the plurality of operation parameters based on the adjustment amount; Equipped with.

[0009] In order to solve the above problem, a boiler control method according to at least one embodiment of the present disclosure includes: In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control method for controlling a boiler in which a plurality of pairs of ejection nozzles, each of which includes at least one of the carbon fuel ejection nozzle or the ammonia ejection nozzle and is arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of ejection nozzles; calculating adjustment amounts for at least a portion of a plurality of operation parameters having a correlation with the air ratio in each of the plurality of regions so that the air ratio for each of the plurality of regions evaluated based on the index parameter approaches uniformity; adjusting at least a portion of the plurality of operating parameters based on the adjustment amount; Equipped with.

[0010] In order to solve the above problem, a boiler control program according to at least one embodiment of the present disclosure includes: In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control program for controlling a boiler in which a plurality of pairs of ejection nozzles, each of which includes at least one of the carbon fuel ejection nozzle or the ammonia ejection nozzle and is arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, On the computer, acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of ejection nozzles; calculating adjustment amounts for at least a portion of a plurality of operation parameters having a correlation with the air ratio in each of the plurality of regions so that the air ratio for each of the plurality of regions evaluated based on the index parameter approaches uniformity; adjusting at least a portion of the plurality of operating parameters based on the adjustment amount; It is possible to execute the above. Effect of the Invention

[0011] According to at least one embodiment of the present disclosure, it is possible to provide a boiler control device, a boiler control method, and a boiler control program that are capable of achieving good exhaust gas performance even during ammonia co-firing by improving the spatial deviation of the air ratio in the furnace. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic configuration diagram of a boiler according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing the arrangement of burners in the cross section taken along the line AA in FIG. [Diagram 3] 1 is a block diagram showing a configuration of a boiler control device according to an embodiment; [Figure 4] 4 is a flowchart illustrating a boiler control method according to one embodiment. [Diagram 5] FIG. 2 is a schematic diagram of a burner layout in a furnace according to an embodiment. [Figure 6] 2 is a schematic diagram of a concentration measuring unit provided on cross section BB of FIG. 1. [Figure 7A] FIG. 13 is a diagram showing a concentration distribution in a concentration measurement unit before adjustment of operation parameters. [Figure 7B] FIG. 13 is a diagram showing a concentration distribution in a concentration measurement unit after adjustment of operation parameters. [Figure 8] 1 is an example of correlation data that defines a correlation between an index parameter and an operation parameter. [Figure 9]13 is an example of optimum value data that specifies a combination of optimum values ​​of operation parameters corresponding to each region for each operating condition. [Figure 10] FIG. 13 is a schematic diagram of a burner layout in a furnace according to another embodiment. [Figure 11] FIG. 13 is a schematic diagram of a burner layout in a furnace according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the present disclosure will be described below with reference to the drawings. Note that the present invention is not limited to this embodiment, and when there are multiple embodiments, the present invention also includes a configuration in which each embodiment is combined. In the following description, up and above refer to the upper side in the vertical direction, and down and below refer to the lower side in the vertical direction, and the vertical direction is not precise and includes an error.

[0014] First, the configuration of a boiler that is the object of control of a boiler control device will be described with reference to Fig. 1. Fig. 1 is a schematic diagram of a boiler according to one embodiment, and Fig. 2 is a schematic diagram showing the arrangement of burners in the AA cross section of Fig. 1.

[0015] The boiler 10 is an ammonia co-firing boiler that can generate superheated steam by burning carbon fuel and ammonia (NH3) using a burner 21 and exchanging the heat generated by this combustion with feed water or steam. The carbon fuel used is biomass fuel or coal, which is crushed to be used as pulverized fuel.

[0016] The boiler 10 has a furnace 11, a combustion device 20, and a combustion gas passage 12. The furnace 11 has a hollow shape of a substantially rectangular cylinder and is installed along a substantially vertical direction. The furnace wall 17 constituting the inner wall surface of the furnace 11 is composed of a plurality of heat transfer tubes and fins connecting the heat transfer tubes, and recovers heat generated by the combustion of fuel by heat exchange with water and steam flowing inside the heat transfer tubes, while suppressing the temperature rise of the furnace wall 17.

[0017] The combustion device 20 is installed in the lower region of the furnace 11. In this embodiment, the combustion device 20 includes a plurality of burners 21 attached to the furnace wall 17. The burners 21 burn carbon fuel or ammonia together with an oxidizing gas (secondary air). In this embodiment, the plurality of burners 21 attached to the furnace wall 17 include a carbon fuel burner having a carbon fuel ejection nozzle for ejecting carbon fuel as fuel into the furnace 11, and an ammonia burner having an ammonia ejection nozzle for ejecting ammonia (NH3) as fuel into the furnace 11 (in this specification, the carbon fuel burner and the ammonia burner are simply referred to as "burner" when they are not distinguished from each other and are collectively referred to). The proportion and layout of the carbon fuel burners or ammonia burners among the plurality of burners 21 included in the combustion device 20 can be appropriately set, and some examples will be specifically shown in the embodiments described later.

[0018] In this embodiment, each burner 21 of the combustion device 20 is configured to be either a carbon fuel burner having a carbon fuel ejection nozzle or an ammonia burner having an ammonia ejection nozzle, and a mode will be described in which the carbon fuel and the ammonia are burned by different burners 21. However, the combustion device 20 may be configured to include a burner 21 having both a carbon fuel ejection nozzle and an ammonia ejection nozzle, so that the carbon fuel and the ammonia are burned by a common burner.

[0019] The burners 21 are provided in a plurality of stages along the vertical direction with respect to the furnace wall 17. In this embodiment, the burners 21 are provided in three stages. FIG. 2 shows the layout of the burners 21 belonging to the uppermost stage among the burners 21 in the plurality of stages on a substantially horizontal plane. In this example, the furnace 11 has a substantially rectangular cross section, and each burner 21 is arranged along the furnace width direction on two opposing faces 17A and 17B. Each of the burners 21A1, 21A2, ... arranged on the face 17A faces each of the burners 21B1, 21B2, ... arranged on the face 17B to form a pair. Specifically, the burners 21A1 and 21B1 form a pair of burners facing each other, and the burners 21A2 and 21B2 form a pair of burners facing each other (the same applies to the other pairs of burners). These pairs of burners are arranged along the furnace width direction.

[0020] Unless otherwise specified, the shape of the furnace 11, the number of stages of the burners 21, the number of burners 21 in one stage, the arrangement of the burners 21, and the like are not limited to those in this embodiment.

[0021] Each burner 21 is supplied with carbon fuel or ammonia as the fuel to be used through a predetermined transport path. The carbon fuel supplied to the burner 21 is generated as pulverized fuel by, for example, a mill. Although illustration is omitted in this specification, the mill is, for example, a vertical roller mill in which a grinding table is supported inside so as to be rotatable and a plurality of grinding rollers are supported above the grinding table so as to be rotatable in conjunction with the rotation of the grinding table. The solid fuel pulverized by the cooperation of the grinding rollers and the grinding table is transported to a classifier provided in the mill by primary air (carrier gas, oxidizing gas) supplied to the mill. In the classifier, the solid fuel is classified into pulverized fuel having a particle size equal to or smaller than that suitable for combustion in the burner 21 and coarse pulverized fuel having a particle size larger than the particle size. The pulverized fuel passes through the classifier and is supplied to the burner 21 together with the primary air. The coarse pulverized fuel that does not pass through the classifier falls onto the grinding table by its own weight inside the mill and is re-pulverized.

[0022] In addition, air supplied from a forced draft fan (not shown) is heated by an air preheater and supplied to each burner 21 as secondary air (combustion air, oxidizing gas). The secondary air supplied to each burner 21 is injected into the furnace 11 from an air ejection nozzle provided on each burner 21.

[0023] The combustion gas passage 12 is connected to the vertical upper part of the furnace 11. The combustion gas passage 12 is provided with a superheater, a reheater, a coal economizer, etc. as heat exchangers for recovering heat from the combustion gas, and heat is exchanged between the combustion gas generated in the furnace 11 and the feed water or steam flowing inside each heat exchanger.

[0024] A flue 13 is connected to the downstream side of the combustion gas passage 12, through which the combustion gas heat-recovered by the heat exchanger is discharged. The flue 13 may be provided with an air preheater for preheating secondary air with the combustion gas flowing through the flue 13, or a denitration device for removing and reducing nitrogen oxides in the combustion gas. A gas duct is connected to the downstream side of the flue 13, and the combustion gas is discharged to the outside of the system as exhaust gas from a chimney through the gas duct. The gas duct may be provided with a dust collector such as an electric dust collector for removing ash and the like in the combustion gas, an environmental device such as a desulfurization device for removing sulfur oxides, and an induced draft fan (IDF) for directing the exhaust gas to these environmental devices.

[0025] In the boiler 10, carbon fuel (pulverized fuel) or ammonia is supplied to the burner 21. Secondary air heated by an air preheater is also supplied to the burner 21. The burner 21 blows a mixture of the carbon fuel or ammonia and the secondary air into the furnace 11. The mixture blown into the furnace 11 is ignited, and a flame is formed. When a flame is formed in the lower region of the furnace 11, high-temperature combustion gas rises in the furnace 11 and flows into the combustion gas passage 12. In this embodiment, air is used as the oxidizing gas (primary air, secondary air), but the oxidizing gas may have a higher or lower oxygen ratio than air, and stable combustion in the furnace 11 is realized by adjusting the ratio of the amount of oxygen to the amount of fuel supplied to an appropriate range.

[0026] In addition, above the mounting position of the burner 21 of the furnace 11, a plurality of additional air ports (AA ports) 25 for supplying additional air for combustion (AA) into the furnace 11 are provided. A part of the air supplied from the forced draft fan is supplied to the additional air ports 25 as additional air for combustion.

[0027] The combustion gas that flows into the combustion gas passage 12 exchanges heat with water and steam in the superheater, reheater, and economizer arranged inside the combustion gas passage 12, and is then discharged into the flue 13, where nitrogen oxides are removed in the denitration device, the combustion gas exchanges heat with primary air and secondary air in the air preheater, and is further discharged into the gas duct, where ash and other particles are removed in the dust collector, and sulfur oxides are removed in the desulfurization device, and the combustion gas is then discharged to the outside of the system from the chimney. Incidentally, the arrangement of the heat exchangers in the combustion gas passage 12 and the devices from the flue 13 to the gas duct does not necessarily have to be in the above-described order with respect to the combustion gas flow.

[0028] Next, a description will be given of a boiler control device 100 for controlling the boiler 10 having the above configuration. Fig. 3 is a block diagram showing the configuration of the boiler control device 100 according to one embodiment.

[0029] The boiler control device 100 includes, for example, a CPU (Central Processing The computer system is composed of a multimedia interface (MI), a random access memory (RAM), a read only memory (ROM), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium in the form of a program, for example, and various functions are realized by the CPU reading the program into the RAM and executing information processing and arithmetic processing. The program may be installed in a ROM or other storage medium in advance, may be provided in a state stored in a computer-readable storage medium, or may be distributed via wired or wireless communication means. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

[0030] The boiler control device 100 includes an index parameter acquisition unit 110, an operation parameter adjustment amount calculation unit 120, and an operation parameter adjustment unit .

[0031] The index parameter acquisition unit 110 is configured to acquire an index parameter Pi for evaluating the air ratio of the furnace 11. The index parameter Pi can be selected from any parameter that has a correlation with the air ratio, and is acquired for each region set in the furnace 11. As shown in FIG. 2, the furnace 11 has a plurality of pairs of burners 21 arranged along the furnace width direction, and a plurality of regions 40-1, 40-2, ... are defined so as to divide the space of the furnace 11 to correspond to each pair of burners 21 (specifically, the region 40-1 corresponds to the pair of burners 21A1 and 21B1, and the region 40-2 corresponds to the pair of burners 21A2 and 21B2). The index parameter acquisition unit 110 acquires the index parameter Pi as an index for evaluating the air ratio in the plurality of regions 40-1, 40-2, ... defined in this way.

[0032] The operation parameter adjustment amount calculation unit 120 is configured to calculate the adjustment amount of the operation parameter Po adjusted by the operation parameter adjustment unit 130. Specifically, based on the index parameters Pi acquired for each region by the index parameter acquisition unit 110, the distribution of the air ratio across the multiple regions 40-1, 40-2, ... is estimated, and the adjustment amount of the operation parameter Po for making the distribution of the air ratio closer to uniform is calculated. The operation parameter Po is correlated with the air ratio of each of the regions 40-1, 40-2, ... and is an arbitrary parameter that can be adjusted as a control target.

[0033] The operation parameter adjustment unit 130 is configured to adjust the operation parameter Po by using the adjustment amount calculated by the operation parameter adjustment amount calculation unit 120. As a result, even if a spatial deviation occurs in the air ratio of the furnace 11 based on the distribution of the air ratio across the multiple regions 40-1, 40-2, ..., the distribution of the air ratio across the multiple regions 40-1, 40-2, ... can be made closer to uniform by adjusting the operation parameter Po, thereby improving the exhaust gas performance.

[0034] Next, a description will be given of a boiler control method implemented using the boiler control device 100 having the above configuration. Fig. 4 is a flowchart showing a boiler control method according to an embodiment.

[0035] First, the index parameter acquisition unit 110 acquires an index parameter Pi for evaluating the air ratio for each of the multiple regions 40-1, 40-2, ... (step S1). For example, as in an embodiment described later, the index parameter Pi may be a concentration of NOx or O2 having a correlation with the air ratio of each region, or may be a supply amount of carbon fuel, ammonia, or oxidizing gas (secondary air) to each region 40-1, 40-2, ...

[0036] Next, based on the index parameter Pi acquired in step S1, it is determined whether the air ratio deviation of the furnace 1 is equal to or greater than a threshold value (step S2). In step S2, first, the distribution of the air ratio across a plurality of regions 40-1, 40-2, ... is obtained based on the index parameter Pi, and the air ratio deviation is calculated as the difference between the maximum value and the minimum value included in the distribution. The threshold value is set in advance as a threshold value for determining whether or not adjustment of the operating parameters is necessary due to a large air ratio deviation.

[0037] If the air ratio deviation is equal to or greater than the threshold value (step S2: YES), it is determined that there is a variation to be corrected in the distribution of the air ratio across the multiple regions 40-1, 40-2, ..., and the operation parameter adjustment amount calculation unit 120 calculates the adjustment amount of the operation parameter Po (step S3). Then, the operation parameter adjustment unit 130 adjusts the operation parameter Po based on the adjustment amount calculated in step S3, thereby controlling the distribution of the air ratio across the multiple regions 40-1, 40-2, ... to approach uniformity (step S4).

[0038] If the air ratio deviation is less than the threshold value (step S2: NO), the boiler control device 100 determines that the variation in the air ratio is already small and uniformization by adjusting the operation parameter Po is not necessary, and ends the series of processes.

[0039] Next, the configuration of the boiler control device 100 and the boiler control method will be described in detail with reference to a specific embodiment. Fig. 5 is a schematic diagram of the layout of the burners 21 in the furnace 11 according to one embodiment, Fig. 6 is a schematic diagram of the concentration measurement unit 60 provided on the cross section BB in Fig. 1, and Figs. 7A and 7B are diagrams showing the concentration distribution in the concentration measurement unit 60 before and after adjustment of the operation parameters, respectively.

[0040] 5, in this embodiment, the multiple burners 21A1, 21A2, ... arranged on the surface 17A of the furnace 11 are ammonia burners having an ammonia ejection nozzle for ejecting ammonia into the furnace 11, and the multiple burners 21B1, 21B2, ... arranged on the surface 17B are carbon fuel burners having a pulverized fuel ejection nozzle for ejecting carbon fuel into the furnace 11. That is, in this embodiment, one side (the surface 17A side) of each pair of burners 21 is an ammonia burner, and the other side (the surface 17B) is configured as a carbon fuel burner.

[0041] Ammonia is supplied from an ammonia supply source (not shown) to the multiple burners 21A1, 21A2, ... which are ammonia burners. An ammonia main transport pipe 50 is connected to the ammonia supply source, and the ammonia main transport pipe 50 branches into multiple ammonia branch transport pipes 52-1, 52-2, ... for each burner 21A1, 21A2, .... Each of the multiple ammonia branch transport pipes 52 is provided with multiple flow rate adjustment valves 54-1, 54-2, ... for adjusting the flow rate of ammonia to each burner 21A1, 21A2, ....

[0042] Further, the carbon fuel burners 21B1, 21B2, ... are supplied with carbon fuel from a carbon fuel supply source (not shown). A carbon fuel main transport pipe 56 is connected to the carbon fuel supply source, and the carbon fuel main transport pipe 56 branches into a plurality of carbon fuel branch transport pipes 58-1, 58-2, ... for each of the burners 21B1, 21B2, ....

[0043] 6 shows a cross section of the furnace 11 at the concentration measuring unit 60 provided on the cross section BB in FIG. 1. The concentration measuring unit 60 is provided downstream of the region of the furnace 11 where the components capable of supplying fuel and air are arranged (i.e., downstream of the AA port 25). The concentration measuring unit 60 can measure the concentration of NOx, which is a gas component correlated with the air ratio, for each of the regions 60-1, 60-2, ... obtained by dividing the internal space of the furnace 11 along the furnace width direction. The regions 60-1, 60-2, ... correspond to the regions 40-1, 40-2, ... shown in FIG. 5, respectively. The concentration measuring unit 60 can obtain the NOx concentration distribution across the multiple regions 60-1, 60-2, ... by measuring the NOx concentration for each of the regions 60-1, 60-2, ....

[0044] As described above with reference to Fig. 1, in this embodiment, since the burners 21 are arranged opposite to each other, the NOx concentration distribution in the regions 60-1, 60-2, ... can be considered to be substantially equal to the NOx concentration distribution in the regions 40-1, 40-2, .... The method of measuring the NOx concentration distribution by the concentration measuring unit 60 is not limited, and various known methods can be adopted. The concentration measuring unit 60 may also measure O2, which is a gas component that has a correlation with the air ratio like NOx.

[0045] FIG. 7A shows the NOx concentration distribution before the operation parameter Po is adjusted by the operation parameter adjustment unit 130. As shown in FIG. 5, the multiple carbon fuel branch conveying pipes 58-1, 58-2, etc. connected to the multiple burners 21B1, 21B2, etc., which are carbon fuel burners, branch off from the common carbon fuel main conveying pipe 56, but there is a certain amount of variation in each length depending on the position of the burners 21B1, 21B2, etc., which are the branch destinations. Therefore, there is a certain amount of variation in the supply amount of carbon fuel from the multiple carbon fuel branch conveying pipes 58-1, 58-2, etc. to each region 40-1, 40-2, etc., resulting in the NOx concentration distribution shown in FIG. 7A. This NOx concentration distribution shows that the NOx concentration is maximum in the region 60-2, while the NOx concentration is minimum in the region 60-6.

[0046] In this embodiment, in step S1, the NOx concentration measured by the concentration measurement unit 60 is acquired as the index parameter Pi. In step S2, the NOx concentration distribution shown in Fig. 7A is identified, and the air ratio deviation is evaluated as the difference between the maximum and minimum values ​​of the NOx concentration included in the NOx concentration distribution. If it is determined in step S3 that the air ratio deviation is equal to or greater than a threshold, in step S4, an adjustment amount of the operation parameter Po is calculated based on the air ratio deviation.

[0047] In one embodiment, the adjustment amount of the operation parameter Po in step S4 is calculated so as to reduce the maximum value of the NOx concentration included in the NOx concentration distribution. In the example of Fig. 7A, since the NOx concentration in the region 40-2 (or region 60-2) is maximum, the operation parameter adjustment amount calculation unit 120 selects the aperture of the flow rate control valve 54-2 capable of controlling the ammonia flow rate in the burner 21A2, which is the ammonia burner corresponding to the region 40-2 (or region 60-2), as the operation parameter Po, and calculates the adjustment amount so as to increase the aperture. As a result, the flow rate of ammonia for the region 40-2 (or region 60-2) increases, and the NOx concentration is adjusted to decrease as shown in Fig. 7B.

[0048] In another embodiment, the adjustment amount of the operation parameter Po in step S4 is calculated so as to increase the minimum value of the NOx concentration included in the NOx concentration distribution. In the example of Fig. 7A, since the NOx concentration in the region 40-6 (or region 60-6) is the minimum, the operation parameter adjustment amount calculation unit 120 selects the aperture of the flow rate control valve 54-6 capable of controlling the ammonia flow rate in the burner 21A6, which is the ammonia burner corresponding to the region 40-6 (or region 60-6), as the operation parameter Po, and calculates the adjustment amount so as to decrease the aperture. As a result, the flow rate of ammonia for the region 40-6 (or region 60-6) is decreased, and the NOx concentration is adjusted to increase as shown in Fig. 7B.

[0049] In another embodiment, the adjustment amount of the operation parameter Po in step S4 may be calculated based on correlation data 70 that defines the correlation between the index parameter Pi and the operation parameter Po. Fig. 8 shows an example of the correlation data 70 that defines the correlation between the index parameter Pi and the operation parameter Po. In this example, the correlation between the NOx concentration, which is an example of the index parameter Pi, and the opening degree of the flow rate control valve 54, which is an example of the operation parameter Po, is expressed by a predetermined function. The operation parameter adjustment amount calculation unit 120 calculates the required adjustment amount of the index parameter Pi based on the appropriate range of the index parameter Pi (for example, an allowable range of variation in the NOx concentration), and applies the required adjustment amount to the correlation data 70 for conversion, thereby obtaining the adjustment amount of the operation parameter Po.

[0050] Since the correlation data 70 depends on the operating conditions of the boiler 10, different correlation data 70 may be prepared in the database for each operating condition. In this case, the operation parameter adjustment unit 130 may select the correlation data 70 corresponding to the operating conditions of the boiler 10 from the database, and calculate the adjustment amount of the operation parameter Po using the selected correlation data 70. The operating conditions of the boiler 10 can be specified by, for example, the boiler load, the burner information used, the ammonia co-firing ratio, etc.

[0051] In another embodiment, the adjustment amount of the operation parameter Po in step S4 may be calculated so that the value of the operation parameter Po corresponding to each region becomes an optimum value predefined for each operating condition. In this case, the optimum value predefined for each operating condition may be registered in advance in a database as optimum value data 80. FIG. 9 shows an example of optimum value data 80 that predefines a combination of optimum values ​​of the operation parameter Po corresponding to each region for each operating condition. In this example, the optimum value of the operation parameter Po for each region is predefined for each operating condition defined by the boiler load, the burner information used, the ammonia co-firing ratio, and the coal type (type of coal fuel). The operation parameter adjustment amount calculation unit 120 acquires the optimum value data 80 corresponding to the operating condition of the boiler 10 from the database, and calculates the adjustment amount so that the operation parameter Po becomes the optimum value of the operation parameter Po predefined in the optimum value data 80.

[0052] In another embodiment, the adjustment amount of the operation parameter Po in step S4 may be calculated using a machine learning model. In this case, the machine learning model is constructed with parameters including the operating conditions of the boiler 10 and the index parameter Pi as explanatory variables, and with the adjustment amount of the operation parameter Po as a response variable. Then, by performing learning using sufficient teacher data including the explanatory variables and the response variable, it is possible to suitably predict the adjustment amount of the operation parameter Po for making the air ratio for each region closer to uniform.

[0053] Next, another embodiment will be described with reference to Fig. 10. Fig. 10 is a schematic diagram of the layout of burners 21 in a furnace 11 according to another embodiment.

[0054] In this embodiment, the plurality of burners 21A1, 21A2, ... arranged on the surface 17A of the furnace 11 and the plurality of burners 21B1, 21B2, ... arranged on the surface 17B are all carbon-fuel burners having pulverized fuel ejection nozzles for ejecting carbon fuel into the furnace 11. That is, in this embodiment, all the burners 21 belonging to a certain stage are configured as carbon-fuel burners (note that in this case, an ammonia burner is present in another stage).

[0055] A carbon fuel supply source (not shown) supplies carbon fuel to the multiple burners 21A, 21B,..., and 21B1, 21B2,..., which are carbon fuel burners. The carbon fuel supply source is connected to carbon fuel main transfer pipes 56A, 56B, which branch into multiple carbon fuel branch transfer pipes 58A-1, 58A-2,..., and 58B-1, 58B-2,..., for each of the burners 21A, 21B,..., and 21B1, 21B2,.... In addition, each carbon fuel branch transport pipe 58A-1, 58A-2, ... and 58B-1, 58B-2, ... is provided with a carbon fuel flow meter 62A-1, 62A-2, ... and 62B-1, 62B-2, ... for detecting the flow rate of the transported carbon fuel.

[0056] In this embodiment, in step S1, the total carbon fuel flow rate in each region 40-1, 40-2, ... is acquired as the index parameter Pi. Specifically, the index parameter acquisition unit 110 acquires the detection values ​​of the carbon fuel flow meters 62A-1, 62A-2, ... and 62B-1, 62B-2, ..., and calculates the total carbon fuel flow rate in each region 40-1, 40-2, ..., as the index parameter Pi. Specifically, for the region 40-1, the total carbon fuel flow rate is calculated as the sum of the detection values ​​of the two corresponding carbon fuel flow meters 62A-1 and 62B-1.

[0057] The total carbon fuel flow rate calculated in this manner is a parameter that is correlated with the air ratio in each region. Therefore, by obtaining the total carbon fuel flow rate for the multiple regions 40-1, 40-2, ..., it is possible to evaluate the air ratio distribution across the multiple regions 40-1, 40-2, ... from a perspective different from that of the above embodiment (i.e., the variation in the actual amount of carbon fuel transported to each region). Then, the operation parameter Po can be adjusted as described above so that the air ratio distribution approaches uniformity (calculation of the adjustment amount of the operation parameter Po and adjustment control of the operation parameter Po are omitted since they are the same as above).

[0058] Next, another embodiment will be described with reference to Fig. 11. Fig. 11 is a schematic diagram of the layout of burners 21 in a furnace 11 according to another embodiment.

[0059] 10, this embodiment is different in that flow control dampers 64A-1, 64A-2,..., and 64B-1, 64B-2,... are provided upstream of the carbon fuel flow meters 62A-1, 62A-2,..., and 62B-1, 62B-2,..., among the multiple carbon fuel branch conveying pipes 58A-1, 58A-2,..., and 58B-1, 58B-2,.... The flow control dampers 64A-1, 64A-2,..., and 64B-1, 64B-2,... are dampers whose opening degree can be controlled based on a control signal from the boiler control device 100, and the supply amount of carbon fuel to the burners 21A1, 21A2,..., and 21B1, 21B2,... can be individually adjusted.

[0060] In this embodiment, the openings of the flow adjustment dampers 64A-1, 64A-2,... and 64B-1, 64B-2,... can be used as the operation parameter Po to be adjusted in step S4. This makes it possible to adjust the flow rate of carbon fuel to each burner 21 so that the air ratio distribution in each region 40-1, 40-2,... approaches uniformity by individually adjusting the openings of the flow adjustment dampers 64A-1, 64A-2,... and 64B-1, 64B-2,... based on the air ratio distribution evaluated based on the index parameter Pi.

[0061] In another embodiment, the operation parameter Po to be adjusted in step S4 may be the amount of secondary air supplied to the ammonia burner among the plurality of burners 21. In this way, the amount of secondary air supplied to each of the regions 40-1, 40-2, ... can be individually adjusted, thereby making the air ratio distribution in the plurality of regions 40-1, 40-2, ... closer to uniform.

[0062] In another embodiment, the amount of additional air supplied from the AA port 25 may be used as the operation parameter Po to be adjusted in step S4. In this way, the amount of additional air supplied to each of the regions 40-1, 40-2, ... can be individually adjusted to make the air ratio distribution in the multiple regions 40-1, 40-2, ... closer to uniform.

[0063] As described above, according to each of the above embodiments, an index parameter Pi for evaluating the air ratio is acquired for each of the regions 40-1, 40-2, .... The air ratio in each of the regions 40-1, 40-2, ... is evaluated based on the index parameter Pi acquired in this way. Based on the air ratio of each of the regions 40-1, 40-2, ... evaluated in this way, a plurality of operation parameters Po correlated with the air ratio are adjusted, so that the air ratio of each of the regions 40-1, 40-2, ... approaches uniformity. This makes it possible to effectively suppress the spatial deviation of the air ratio in each of the regions 40-1, 40-2, ..., and improve the boiler performance.

[0064] The contents described in each of the above embodiments can be understood, for example, as follows.

[0065] (1) A boiler control device according to one embodiment includes: In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control device for controlling a boiler in which a plurality of pairs of ejection nozzles, each of which includes at least one of the carbon fuel ejection nozzle or the ammonia ejection nozzle and is arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, an index parameter acquiring unit for acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of ejection nozzles; an operation parameter adjustment amount calculation unit for calculating adjustment amounts for at least a part of a plurality of operation parameters having a correlation with the air ratio in each of the plurality of regions so that the air ratio for each of the plurality of regions evaluated based on the index parameter approaches uniformity; an operation parameter adjustment unit for adjusting at least a part of the plurality of operation parameters based on the adjustment amount; Equipped with.

[0066] According to the above aspect (1), in a so-called opposed firing type boiler in which a pair of ejection nozzles for ejecting carbon fuel or ammonia into a furnace are arranged along the furnace width direction, an index parameter for evaluating an air ratio is acquired for each region corresponding to each pair of ejection nozzles. The air ratio in each region is evaluated based on the index parameter thus acquired, and an adjustment amount of an operation parameter is calculated so that the air ratio in each region approaches uniformity. By adjusting the operation parameter correlated with the air ratio in each region based on the adjustment amount thus calculated, the spatial deviation of the air ratio in each region can be effectively suppressed, and the boiler performance can be improved.

[0067] (2) In another embodiment, in the above embodiment (1), The operation parameter adjustment amount calculation unit calculates the adjustment amount when an air ratio deviation included in an air ratio distribution in the plurality of regions evaluated based on the index parameter is equal to or greater than a threshold value.

[0068] According to the above aspect (2), whether or not adjustment of the operation parameters is required is determined based on whether the air-ratio deviation included in the air-ratio distribution evaluated from the index parameter is equal to or greater than a threshold value. If the air-ratio deviation is equal to or greater than the threshold value, it is determined that the spatial deviation of the air-ratio is large and therefore adjustment of the operation parameters is required, and the adjustment amount of the operation parameters is calculated.

[0069] (3) In another embodiment, in the above embodiment (2), The operation parameter adjustment amount calculation unit calculates the adjustment amount so as to reduce a maximum value included in the air ratio distribution.

[0070] According to the above aspect (3), the operation parameters are adjusted so as to reduce the maximum value included in the air ratio distribution, thereby efficiently making the air ratio distribution having spatial deviations closer to uniform, thereby improving the boiler performance.

[0071] (4) In another embodiment, in the above embodiment (2) or (3), The operation parameter adjustment amount calculation unit calculates the adjustment amount so that a minimum value included in the air ratio distribution increases.

[0072] According to the above aspect (4), the operation parameters are adjusted so that the minimum value included in the air ratio distribution increases. This makes it possible to efficiently make the air ratio distribution having spatial deviations closer to uniform, thereby improving the boiler performance.

[0073] (5) In another embodiment, in the above embodiment (1) or (2), The operation parameter adjustment amount calculation unit calculates the adjustment amount of the operation parameter by converting a required adjustment amount of the index parameter based on correlation data that defines a correlation between the index parameter and the operation parameter.

[0074] According to the above aspect (5), the adjustment amount of the operation parameter can be suitably calculated from the required adjustment amount of the index parameter by using the correlation data that defines the correlation between the index parameter and the operation parameter.

[0075] (6) In another embodiment, in the above embodiment (5), The correlation data is prepared for each operating condition of the boiler.

[0076] According to the above aspect (6), by preparing correlation data for each operating condition, it is possible to more accurately calculate the adjustment amounts of the operation parameters for making the air ratio distribution closer to uniform in accordance with the operating state of the boiler.

[0077] (7) In another embodiment, in the above embodiment (1) or (2), The operation parameter adjustment amount calculation unit calculates an adjustment amount of the operation parameter based on optimum value data that specifies optimum values ​​of the operation parameter corresponding to each of the plurality of regions for each operating condition of the boiler.

[0078] According to the above aspect (7), by adjusting the operation parameters so that the optimum values ​​defined in the optimum value data are reached in accordance with the operating conditions of the boiler, the air ratio distribution for each region can be effectively made closer to uniform.

[0079] (8) In another embodiment, in the above embodiment (1) or (2), The operation parameter adjustment amount calculation unit calculates the adjustment amount using a machine learning model for predicting an adjustment amount of the operation parameter based on an operating condition of the boiler or the index parameter.

[0080] According to the above aspect (8), by adjusting the operation parameters using the adjustment amount predicted using the machine learning model, the air ratio distribution for each region can be effectively made closer to uniform.

[0081] (9) In another embodiment, in any one of the above (1) to (8), The index parameter is a measured value of NOx concentration or O2 concentration in the furnace.

[0082] According to the above aspect (9), by using the NOx concentration or the O2 concentration as the index parameter, the air ratio for each region can be suitably evaluated.

[0083] (10) In another embodiment, in any one of the above (1) to (8), The index parameter is the total supply of the carbon fuel per region.

[0084] According to the above aspect (10), the total amount of carbon fuel supplied to each region is used as an index parameter, so that the air ratio for each region can be suitably evaluated.

[0085] (11) In another embodiment, in any one of the above (1) to (10), The operating parameter is the amount of ammonia supplied to each of the plurality of regions.

[0086] According to the above aspect (11), by adjusting the amount of ammonia supplied to each zone as an operation parameter, the air ratio for each zone can be made closer to uniform, and the boiler performance can be effectively improved.

[0087] (12) In another embodiment, in any one of the above (1) to (10), The operating parameter is a supply of the carbon fuel to each of the plurality of regions.

[0088] According to the above aspect (12), by adjusting the amount of carbon fuel supplied to each zone as an operation parameter, the air ratio for each zone can be made closer to uniform, and the boiler performance can be effectively improved.

[0089] (13) In another embodiment, in any one of the above (1) to (10), The operating parameter is the amount of air supplied to each of the plurality of regions.

[0090] According to the above aspect (13), by adjusting the amount of air supplied to each zone as an operation parameter, the air ratio for each zone can be made closer to uniform, and the boiler performance can be effectively improved.

[0091] (14) In another embodiment, in any one of the above (1) to (13), The carbonaceous fuel ejected from the carbonaceous fuel ejection nozzle and the ammonia ejected from the ammonia ejection nozzle are combusted in burners independent of each other.

[0092] According to the above aspect (14), in a boiler in which a carbon fuel and ammonia are combusted in burners independent of each other, good exhaust gas performance can be achieved by improving the spatial deviation of the air ratio in the furnace during ammonia co-firing.

[0093] (15) A boiler control method according to one aspect includes the steps of: In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control method for controlling a boiler in which a plurality of pairs of ejection nozzles, each of which includes at least one of the carbon fuel ejection nozzle or the ammonia ejection nozzle and is arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of ejection nozzles; calculating adjustment amounts for at least a portion of a plurality of operation parameters having a correlation with the air ratio in each of the plurality of regions so that the air ratio for each of the plurality of regions evaluated based on the index parameter approaches uniformity; adjusting at least a portion of the plurality of operating parameters based on the adjustment amount; Equipped with.

[0094] According to the above aspect (15), in a so-called opposed firing type boiler in which a pair of ejection nozzles for ejecting carbonaceous fuel or ammonia into a furnace are arranged along the furnace width direction, an index parameter for evaluating an air ratio is acquired for each region corresponding to each pair of ejection nozzles. The air ratio in each region is evaluated based on the index parameter thus acquired, and an adjustment amount of an operation parameter is calculated so that the air ratio in each region approaches uniformity. By adjusting the operation parameter correlated with the air ratio in each region based on the adjustment amount thus calculated, the spatial deviation of the air ratio in each region can be effectively suppressed, and the boiler performance can be improved.

[0095] (16) A boiler control program according to one embodiment of the present invention comprises: In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control program for controlling a boiler in which a plurality of pairs of ejection nozzles, each of which includes at least one of the carbon fuel ejection nozzle or the ammonia ejection nozzle and is arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, On the computer, acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of ejection nozzles; calculating adjustment amounts for at least a portion of a plurality of operation parameters having a correlation with the air ratio in each of the plurality of regions so that the air ratio for each of the plurality of regions evaluated based on the index parameter approaches uniformity; adjusting at least a portion of the plurality of operating parameters based on the adjustment amount; It is possible to execute the above.

[0096] According to the above aspect (16), in a so-called opposed firing type boiler in which a pair of ejection nozzles for ejecting carbonaceous fuel or ammonia into a furnace are arranged along the furnace width direction, an index parameter for evaluating an air ratio is acquired for each region corresponding to each pair of ejection nozzles. The air ratio in each region is evaluated based on the index parameter thus acquired, and an adjustment amount of an operation parameter is calculated so that the air ratio in each region approaches uniformity. By adjusting the operation parameter correlated with the air ratio in each region based on the adjustment amount thus calculated, the spatial deviation of the air ratio in each region can be effectively suppressed, and the boiler performance can be improved. [Explanation of symbols]

[0097] 10. Boiler 11 Furnace 12 Combustion gas passage 13 Flue 17 Furnace wall 20 Combustion equipment 21 Burner 25 Additional Air Port 50 Ammonia main transport pipe 52 Ammonia branch transport pipe 54 Flow control valve 56 Carbon fuel main transport pipe 58 Carbon fuel branch pipe 60 Concentration measurement unit 62 carbon fuel flow meter 64 Flow Control Damper 70 Correlation Data 80 Optimal Value Data 100 Boiler control device 110 Index parameter acquisition unit 120 Operation parameter adjustment amount calculation unit 130 Operation parameter adjustment section

Claims

1. In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control device for controlling a boiler in which a plurality of pairs of jet nozzles, each including at least one of the carbon fuel jet nozzle or the ammonia jet nozzle and arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, an index parameter acquiring unit for acquiring index parameters for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of jet nozzles; an operation parameter adjustment amount calculation unit for calculating adjustment amounts for at least some of a plurality of operation parameters correlated with the air ratios in each of the plurality of regions so that the air ratios for each of the plurality of regions evaluated based on the index parameters approach uniformity; an operation parameter adjustment unit for adjusting at least some of the plurality of operation parameters based on the adjustment amount; Equipped with The boiler control device, wherein the index parameter is a measured value of NOx concentration or O2 concentration in the furnace.

2. 2. The boiler control device according to claim 1, wherein the operation parameter adjustment amount calculation unit calculates the adjustment amount when an air ratio deviation included in an air ratio distribution in the plurality of regions evaluated based on the index parameter is equal to or greater than a threshold value.

3. The boiler control device according to claim 2 , wherein the operation parameter adjustment amount calculation unit calculates the adjustment amount so as to reduce a maximum value included in the air ratio distribution.

4. The boiler control device according to claim 2 , wherein the operation parameter adjustment amount calculation unit calculates the adjustment amount so that a minimum value included in the air ratio distribution increases.

5. 3. The boiler control device according to claim 1, wherein the operation parameter adjustment amount calculation unit calculates the adjustment amount of the operation parameter by converting a required adjustment amount of the index parameter based on correlation data that defines a correlation between the index parameter and the operation parameter.

6. The boiler control device according to claim 5 , wherein the correlation data is prepared for each operating condition of the boiler.

7. 3. The boiler control device according to claim 1, wherein the operation parameter adjustment amount calculation unit calculates the adjustment amount of the operation parameter based on optimal value data that specifies optimal values ​​of the operation parameter corresponding to each of the plurality of regions for each operating condition of the boiler.

8. 3. The boiler control device according to claim 1, wherein the operation parameter adjustment amount calculation unit calculates the adjustment amount using a machine learning model for predicting the adjustment amount of the operation parameter based on the operating conditions of the boiler or the index parameter.

9. The boiler control device according to claim 1 or 2, wherein the index parameter is a total supply amount of the carbon fuel for each of the regions.

10. The boiler control device according to claim 1 or 2, wherein the operation parameter is a supply amount of the ammonia to each of the plurality of regions.

11. The boiler control device according to claim 1 or 2, wherein the operating parameter is a supply amount of the carbonaceous fuel to each of the plurality of regions.

12. The boiler control device according to claim 1 or 2, wherein the operation parameter is an amount of air supplied to each of the plurality of regions.

13. The boiler control device according to claim 1 or 2, wherein the carbonaceous fuel ejected from the carbonaceous fuel ejection nozzle and the ammonia ejected from the ammonia ejection nozzle are combusted in burners independent of each other.

14. A boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control device for controlling a boiler in which a plurality of pairs of jet nozzles, each including at least one of the carbon fuel jet nozzle or the ammonia jet nozzle and arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, an index parameter acquiring unit for acquiring index parameters for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of jet nozzles; an operation parameter adjustment amount calculation unit for calculating adjustment amounts for at least some of a plurality of operation parameters correlated with the air ratios in each of the plurality of regions so that the air ratios for each of the plurality of regions evaluated based on the index parameters approach uniformity; an operation parameter adjustment unit for adjusting at least some of the plurality of operation parameters based on the adjustment amount; Equipped with The operation parameter adjustment amount calculation unit calculates the adjustment amount using a machine learning model for predicting the adjustment amount of the operation parameter based on the operating conditions of the boiler or the index parameter.

15. In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control method for controlling a boiler in which a plurality of pairs of jet nozzles, each including at least one of the carbon fuel jet nozzle or the ammonia jet nozzle and arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of jet nozzles; calculating adjustment amounts for at least some of a plurality of operating parameters correlated with the air ratios in each of the plurality of regions so that the air ratios for each of the plurality of regions evaluated based on the index parameters approach uniformity; adjusting at least some of the plurality of operating parameters based on the adjustment amount; Equipped with The boiler control method, wherein the index parameter is a measured value of NOx concentration or O2 concentration in the furnace.

16. In a boiler that burns carbon fuel and ammonia in a furnace, a carbonaceous fuel injection nozzle for injecting the carbonaceous fuel into the furnace; an ammonia injection nozzle for injecting the ammonia into the furnace; Equipped with A boiler control program for controlling a boiler in which a plurality of pairs of jet nozzles, each including at least one of the carbon fuel jet nozzle or the ammonia jet nozzle and arranged on a wall surface of the furnace so as to face each other, are arranged along a furnace width direction of the furnace, On the computer, acquiring an index parameter for evaluating an air ratio for each of a plurality of regions corresponding to the plurality of pairs of jet nozzles; calculating adjustment amounts for at least some of a plurality of operating parameters correlated with the air ratios in each of the plurality of regions so that the air ratios for each of the plurality of regions evaluated based on the index parameters approach uniformity; adjusting at least some of the plurality of operating parameters based on the adjustment amount; and The boiler control program, wherein the index parameter is a measured value of NOx concentration or O2 concentration in the furnace.

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