Boiler system and method for controlling the boiler system

Abstract

The condition of deposits on the surface of boiler heat transfer tubes can be easily visually inspected. [Solution] A boiler system is provided comprising: a plurality of soot blowers capable of performing a steam injection operation to inject steam onto the surface of heat transfer tubes; a plurality of temperature detection units for detecting the temperature of the plurality of heat transfer tubes; a calculation unit that calculates a calculated value corresponding to the amount of deposits removed by the steam injection operation based on the temperature detected by the temperature detection unit corresponding to the heat transfer tube located near a predetermined soot blower when the predetermined soot blower performs a steam injection operation; and a display unit that displays the calculated value in correspondence with the position on the furnace wall where the predetermined soot blower is located.

Description

Technical Field

[0001] The present disclosure relates to a boiler system and a method for controlling the boiler system.

Background Art

[0002] A boiler injects fuel from a burner into a furnace and burns it in the furnace. The boiler is provided with a large number of heat transfer tubes constituting a superheater and a reheater, and ash and the like burned during boiler operation adhere to the heat transfer tubes as deposits (clinkers). If the boiler operation is continued with the clinkers adhering to the heat transfer tubes, the heat exchange efficiency of the heat transfer tubes decreases. Therefore, the soot blower is periodically operated to remove the deposits adhering to the heat transfer tubes (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The adhesion state of deposits on the heat transfer tubes varies depending on the type of fuel burned in the furnace, the arrangement state of the burner, the operation state of the furnace, and the like. However, it is not possible to directly visually recognize the adhesion state of deposits on the heat transfer tubes in the furnace, and it has not been possible to appropriately adjust the operation interval of the soot blower according to the adhesion state of the deposits.

[0005] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a boiler system and a method for controlling the boiler system that can easily visually recognize the state of deposits on the surface of the boiler heat transfer tubes.

Means for Solving the Problems

[0006] A boiler system according to one aspect of the present disclosure comprises a furnace configured with a furnace wall having a plurality of heat transfer tubes through which fluid flows; a combustion device that generates combustion gas by injecting fuel and combustion air into the furnace; a plurality of soot blowers capable of performing a steam injection operation to inject steam onto the surface of the heat transfer tubes; a plurality of temperature detection units for detecting the temperature of the plurality of heat transfer tubes; a calculation unit that calculates a calculated value corresponding to the amount of deposits removed by the steam injection operation based on the temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower when the predetermined soot blower performs the steam injection operation; and a display unit that displays the calculated value in correspondence with the position on the furnace wall where the predetermined soot blower is located.

[0007] A boiler control method according to one aspect of the present disclosure, the boiler system comprises a furnace configured with a furnace wall having a plurality of heat transfer tubes through which fluid flows; a combustion device that generates combustion gas by injecting fuel and combustion air into the furnace; a plurality of soot blowers capable of performing a steam injection operation to inject steam onto the surface of the heat transfer tubes; and a plurality of temperature detection units for detecting the temperature of the plurality of heat transfer tubes, the method comprising: a temperature detection step in which the temperature detection units detect the temperature of the heat transfer tubes located near a predetermined soot blower when a predetermined soot blower performs the steam injection operation; a calculation step in which a calculated value is calculated based on the temperature detected in the temperature detection step, corresponding to the amount of deposits removed by the steam injection operation; and a display step in which the calculated value is displayed in correspondence with the position on the furnace wall where the predetermined soot blower is located. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide a boiler system and a control method for the boiler system that make it possible to easily visually inspect the condition of deposits on the surface of boiler heat transfer tubes. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing a boiler system according to one embodiment of the present disclosure. [Figure 2] This is a perspective view showing a furnace according to one embodiment of the present disclosure. [Figure 3] Figure 2 is a cross-sectional view taken along the CC arrow in the lower region of the furnace wall. [Figure 4] This is a schematic diagram showing the structure of a soot blower. [Figure 5] Figure 3 shows the front wall of the lower region of the furnace as viewed from the outside of the furnace. [Figure 6] Figure 3 shows the rear wall of the lower region of the furnace as viewed from the outside of the furnace. [Figure 7] Figure 3 shows the right side wall of the lower region of the furnace, viewed from the outside of the furnace. [Figure 8] Figure 3 shows the left side wall of the lower region of the furnace, viewed from the outside of the furnace. [Figure 9] This graph shows the operating status of the soot blower and the time-dependent changes in the temperature of the heat transfer tube. [Figure 10] This is an unfolded view of the furnace wall showing the arrangement of the furnace wall, heat transfer tubes, and temperature detection sensors. [Figure 11] This diagram shows the difference in temperature between the maximum and minimum temperature values ​​detected by multiple temperature detection units when the soot blower is in operation, divided into sections A to D. [Figure 12] This figure shows an example of displaying the difference temperature between the maximum and minimum temperature values ​​detected by multiple temperature detection units when a soot blower is in operation. [Figure 13] This flowchart shows the process by which a designated soot blower performs a steam injection operation. [Figure 14] This flowchart shows the process of operating a designated soot blower at set operating intervals. [Modes for carrying out the invention]

[0010] An embodiment of the present disclosure will be described below with reference to the drawings. This embodiment does not limit the present disclosure, and if there are multiple embodiments, they may be combinations of these embodiments. In the following description, "up" or "above" refers to the upper vertical direction, and "down" or "below" refers to the lower vertical direction; the vertical direction is not precise and includes some error.

[0011] Figure 1 shows a boiler system 100 equipped with a boiler 10 that uses pulverized fuel as its main fuel according to this embodiment. The boiler system 100 comprises a boiler 10, a control unit 50 that controls the boiler 10, a calculation unit 80, and a display unit 90. The boiler 10 of this embodiment is a boiler that burns pulverized fuel, which is obtained by crushing solid fuel, using a combustion device, and generates superheated steam by exchanging the heat generated by this combustion with feedwater or steam. As the solid fuel, biomass fuel or coal can be used. In addition, the combustion device equipped with the boiler 10 may burn other fuels other than solid fuel (such as fuel gas or liquid fuel).

[0012] The boiler 10 has a furnace 11, a combustion device 20, and a combustion gas passage 12. The furnace 11 has a hollow rectangular shape and is installed along the vertical direction. The furnace 11 is formed by a furnace wall 101 which is the inner wall surface. The furnace wall 101 is composed of a plurality of heat transfer tubes 101C through which a fluid (water, steam) flows, and fins (not shown) that connect the heat transfer tubes 101C to each other. The furnace wall 101 recovers the heat generated by the combustion of pulverized fuel by exchanging heat with the fluid (water or steam) flowing inside the heat transfer tubes. The heat transfer tubes 101C suppress the temperature rise of the furnace wall 101.

[0013] The combustion device 20 is a device that generates combustion gas by injecting solid fuel and combustion air into the furnace 11. The combustion device 20 is installed in the lower region 101A of the furnace 11. In this embodiment, the combustion device 20 has a plurality of burners 21A, 21B, 21C, 21D, 21E, and 21F (hereinafter, these burners will be simply referred to as "burner 21" when not distinguished) mounted on the furnace wall 101.

[0014] The burners 21 are arranged at equal intervals in the furnace width direction along the furnace wall 101 (for example, arranged in the furnace width direction so as to face the opposing furnace walls 101 respectively for opposed combustion), and are arranged in a plurality of stages along the vertical direction. The shape of the furnace, the number of stages of the burners, the number of burners in one stage, the arrangement of the burners, etc. are not limited to this embodiment.

[0015] The burners 21A, 21B, 21C, 21D, 21E, and 21F are respectively connected to a plurality of mills (pulverizers) 31A, 31B, 31C, 31D, 31E, and 31F (hereinafter, simply referred to as "mill 31" when these mills are not distinguished) via a plurality of pulverized fuel supply pipes 22A, 22B, 22C, 22D, 22E, and 22F (hereinafter, simply referred to as "pulverized fuel supply pipe 22" when these pulverized fuel supply pipes are not distinguished).

[0016] The mill 31 is, for example, a vertical roller mill in which a pulverizing table (not shown) is supported inside so as to be rotatable, and a plurality of pulverizing rollers (not shown) are supported above the pulverizing table so as to be rotatable in conjunction with the rotation of the pulverizing table. The solid fuel pulverized by the cooperation of the pulverizing rollers and the pulverizing table is conveyed to a classifier (not shown) provided in the mill 31 by the primary air (transport gas, oxidizing gas) supplied to the mill 31.

[0017] In the classifier, it is classified into pulverized fuel having a particle size suitable for combustion by the burner 21 and coarse powder fuel having a particle size larger than the above particle size. The pulverized fuel passes through the classifier and is supplied to the burner 21 through the pulverized fuel supply pipe 22 together with the primary air. The coarse powder fuel that has not passed through the classifier falls onto the pulverizing table due to its own weight inside the mill 31 and is pulverized again.

[0018] An air register 23 is provided on the outside of the furnace 11 where the burner 21 is installed, and one end of an air duct 24 is connected to this air register 23. A forced draft fan (FDF) 32 is connected to the other end of the air duct 24. The air supplied from the forced draft fan 32 is heated by an air preheater 42 installed in the air duct 24, and is supplied to the burner 21 as secondary air (combustion air, oxidizing gas) via the air register 23 and introduced into the furnace 11.

[0019] The combustion gas passage 12 is connected to the vertical upper part of the furnace 11. The combustion gas passage 12 is equipped with superheaters 102A, 102B, 102C (hereinafter, these superheaters will be simply referred to as "superheater 102" when not distinguished), reheaters 103A, 103B (hereinafter, these reheaters will be simply referred to as "reheater 103" when not distinguished), and an economizer 104 as heat exchangers for recovering heat from the combustion gas. Heat exchange takes place between the combustion gas generated in the furnace 11 and the feedwater or steam circulating inside each heat exchanger. Note that the arrangement and shape of each heat exchanger are not limited to the configuration shown in Figure 1.

[0020] Downstream of the combustion gas passage 12 is a flue 13 through which the combustion gas, whose heat has been recovered by the heat exchanger, is discharged. An air preheater (air heater) 42 is installed between the flue 13 and the air duct 24, and heat exchange takes place between the air flowing through the air duct 24 and the combustion gas flowing through the flue 13. By heating the primary air supplied to the mill 31 and the secondary air supplied to the burner 21, heat is further recovered from the combustion gas after heat exchange with water or steam.

[0021] Furthermore, a denitrification device 43 may be provided in the flue 13 at a position upstream of the air preheater 42. The denitrification device 43 supplies a reducing agent, such as ammonia or urea solution, which has the effect of reducing nitrogen oxides, to the combustion gas flowing through the flue 13. The reaction between the nitrogen oxides (NOx) in the combustion gas to which the reducing agent has been supplied and the reducing agent is promoted by the catalytic action of a denitrification catalyst installed in the denitrification device 43, thereby removing and reducing nitrogen oxides in the combustion gas.

[0022] A gas duct 41 is connected downstream of the air preheater 42 in the flue 13. The gas duct 41 is equipped with dust collection devices 44, such as an electrostatic precipitator, to remove ash and other particles from the combustion gas, and environmental devices such as a desulfurization device 46 to remove sulfur oxides, as well as an induced draft fan (IDF) 45 to guide the exhaust gas to these environmental devices. The downstream end of the gas duct 41 is connected to the chimney 47, and the combustion gas treated by the environmental devices is discharged outside the system as exhaust gas.

[0023] In boiler 10, when burning pulverized fuel, multiple mills 31 are driven to pulverize the solid fuel, and the pulverized fuel classified by the classifier is supplied to burner 21 via pulverized fuel supply pipe 22 along with primary air. In addition, secondary air heated by air preheater 42 is supplied to burner 21 from air duct 24 via wind box 23. Burner 21 blows a pulverized fuel mixture, which is a mixture of pulverized fuel and primary air, into furnace 11, and also blows secondary air into furnace 11.

[0024] The fine fuel mixture blown into the furnace 11 ignites and reacts with the secondary air to form a flame. The flame is formed in the lower region of the furnace 11, and the high-temperature combustion gas rises inside 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 a gas with a higher or lower oxygen content than air may also be used. By adjusting the ratio of oxygen to the supplied fuel within an appropriate range, stable combustion can be achieved in the furnace 11.

[0025] Furthermore, above the mounting position of the burner 21 in the furnace 11, a number of additional air ports (AA ports) 25 are provided to supply additional combustion air (AA) into the furnace 11. The ends of additional air ducts (AA ducts) 26, which branch off from the air duct 24, are connected to the additional air ports 25, and a portion of the air supplied from the forced draft fan 32 can be supplied to the additional air ports 25 as additional combustion air via the additional air ducts 26.

[0026] In region A inside the furnace 11 shown in Figure 1 (the region corresponding to the height range of installation of the wind box 23), a flame is formed by the combustion of a mixture of primary air and pulverized fuel with secondary air. Here, the air ratio in region A is set to 1 or less. Specifically, the amount of air supplied to the burner 21 (the total amount of primary and secondary air) is set to be less than the theoretical amount of air relative to the amount of fuel supplied to the burner 21. As a result, regions A and B inside the furnace 11 (the region between the top of the burner 21 and the bottom of the additional air port 25) become a reducing atmosphere, and nitrogen oxides (NOx) generated by combustion are reduced inside the furnace 11. Subsequently, in region C (the region above the bottom of the additional air port 25), additional combustion air is supplied from the additional air port 25 to the combustion gas from which NOx has been reduced, and combustion is completed. However, the amount of NOx generated is reduced by the reduction effect in regions A and B.

[0027] The combustion gas flowing into the combustion gas passage 12 undergoes heat exchange with water and steam in the superheater 102, reheater 103, and economizer 104 located inside the combustion gas passage 12, before being discharged into the flue 13. There, nitrogen oxides are removed in the denitrification device 43, and after heat exchange with primary and secondary air in the air preheater 42, it is further discharged into the gas duct 41. Ash and other contaminants are removed in the dust collector 44, and sulfur oxides are removed in the desulfurization device 46 before being discharged out of the system through the chimney 47. Note that the arrangement of each heat exchanger in the combustion gas passage 12 and each device from the flue 13 to the gas duct 41 does not necessarily have to be in the order described above with respect to the combustion gas flow.

[0028] The control unit 50 is a device that controls various parts of the boiler 10. The control unit 50 is composed of, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions are stored in the storage medium in the form of a program, for example. The CPU reads this program into the RAM and performs information processing and calculations to realize the various functions.

[0029] The program may be provided in various forms, such as being pre-installed on ROM or other storage media, being stored on a computer-readable storage medium, or being distributed via wired or wireless communication. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memory.

[0030] Next, with reference to Figures 2 to 4, a temperature detection sensor (temperature detection unit) 60 for detecting the temperature of heat transfer tubes 101C arranged in the furnace wall 101 will be described. Figure 2 is a perspective view showing a furnace 11 according to one embodiment of the present disclosure. Figure 3 is a cross-sectional view taken along the CC arrow of the lower region 101A of the furnace wall 101 shown in Figure 2.

[0031] As shown in Figure 2, the furnace 11 of this embodiment is formed by a furnace wall 101 having a lower region 101A and an upper region 101B. The furnace wall 101 has a front wall 101a to which the burners 21D, 21E, and 21F of the combustion device 20 are attached, a rear wall 101b to which the burners 21A, 21B, and 21C of the combustion device 20 are attached, a right side wall 101c which is the right side of the furnace 11, and a left side wall 101d which is the left side of the furnace 11.

[0032] In Figure 2, the labels 21Aa, 21Ba, 21Ca, 21Da, 21Ea, and 21F indicate the positions where burners 21A, 21B, 21C, 21D, 21E, and 21F are installed, respectively.

[0033] As shown in Figure 2, in the lower region 101A of the furnace wall 101, the heat transfer tubes 101C are formed to extend in a direction inclined with respect to the vertical direction VD. The heat transfer tubes 101C are formed in a spiral shape that rotates in the order of the front wall 101a, right wall 101c, rear wall 101b, and left wall 101d as they move along the vertical direction VD. Alternatively, the heat transfer tubes 101C may be formed on each of the front wall 101a, right wall 101c, rear wall 101b, and left wall 101d so as to extend along the vertical direction VD.

[0034] Furthermore, as shown in Figure 2, in the upper region 101B of the furnace wall 101, the heat transfer tubes 101C are formed to extend along the vertical direction VD. The heat transfer tubes 101C in the lower region 101A and the heat transfer tubes 101C in the upper region 101B are connected at the connection point between the lower region 101A and the upper region 101B so that fluid (water, steam) flows continuously between them. Note that the shape and direction of extension of the heat transfer tubes 101C shown in Figure 2 are just examples, and other configurations are possible. For example, the heat transfer tubes 101C in the lower region 101A may be shaped to extend along the vertical direction VD.

[0035] As shown in Figure 3, the boiler 10 of this embodiment has a plurality of temperature detection sensors 60 that detect the temperature of the heat transfer tube 101C at the upper end of the vertical direction VD of the lower region 101A of the furnace wall 101. Here, the temperature of the heat transfer tube 101C may be the metal temperature of the heat transfer tube 101C, or it may be the temperature of the fluid flowing inside the heat transfer tube 101C.

[0036] As shown in Figure 3, the boiler 10 has a plurality of temperature detection sensors (temperature detection units) 60a, 60b, 60c, 60d, 60e, 60f, 60g, 60h, 60i, 60j, 60k, 60l, 60m, 60n, 60o, 60p, 60q, 60r, 60s, 60t (hereinafter also referred to as temperature detection sensor 60).

[0037] Next, with reference to Figure 4, the soot blower 70 provided in the boiler 10 of this embodiment will be described. The soot blower 70 shown in Figure 4 is a device that performs a steam injection operation to inject steam toward the surface of the heat transfer tubes 101C, removing clinker adhering to the surface of the heat transfer tubes 101C and the inner wall surface of the furnace wall 101. The boiler 10 has a plurality of soot blowers 70 attached to the front wall 101a, rear wall 101b, right side wall 101c, and left side wall 101d, respectively. Although the soot blower 70 shown in Figure 4 is positioned on the furnace wall 101 of the furnace 11, other configurations are possible. For example, the soot blower 70 may be positioned on the wall surface (water-cooled wall or steam-cooled wall) that defines the combustion gas passage 12 in which the superheater 102, reheater 103, and economizer 104 are located.

[0038] As shown in Figure 4, the soot blower 70 comprises a nozzle block 71 having injection holes 71a and 71b, a soot blower tube 72 whose tip is connected to the nozzle block 71, and a motor 73. The motor 73 and the soot blower tube 72 are connected via a power transmission mechanism such as gears (not shown), and the rotation of the motor 73 enables the soot blower tube 72 to rotate around its central axis and move in the direction of the central axis. The soot blower 70 can switch between an inserted state, shown by a solid line, in which the nozzle block 71 is inserted into the furnace 11, and an withdrawn state, shown by a dotted line, in which the nozzle block 71 is withdrawn from the furnace 11.

[0039] The motor 73 is driven based on commands from the control unit 50. The rear end of the soot blower tube 72 is connected to the injection steam supply line 74. The soot blower 70 circulates steam at a pressure adjusted by the steam pressure control valve 75 through the soot blower tube 72 and injects the steam into the furnace 11 from the injection holes 71a and 71b. By injecting steam from the injection holes 71a and 71b toward the surface of the heat transfer tube 101C, deposits (clinker) adhering to the heat transfer tube 101C are removed.

[0040] Next, the soot blower 70 attached to the furnace wall 101 will be described with reference to Figures 5 to 8. In Figures 5 to 8, the horizontal direction is indicated by HD and the vertical direction by VD. Note that the positions and number of soot blowers 70 shown in Figures 5 to 8 are examples, and different positions and numbers may be used.

[0041] Figure 5 is a view of the front wall 101a of the lower region 101A of the furnace 11 shown in Figure 3, as seen from the outside of the furnace 11. As shown in Figure 5, soot blowers 70F1a, 70F3a, 70F5a, 70F7a, 70F9a, 70F2b, 70F4b, 70F6b, 70F8b, 70F10b, 70F1c, 70F3c, 70F5c, 70F7c, 70F9c, 70F2d, 70F4d, 70F6d, 70F8d, and 70F10d are attached to the front wall 101a.

[0042] Figure 6 is a view of the rear wall 101b of the lower region 101A of the furnace 11 shown in Figure 3, as seen from the outside of the furnace 11. As shown in Figure 6, soot blowers 70B8a, 70B6a, 70B4a, 70B2a, 70B9b, 70B7b, 70B5b, 70B3b, 70B1b, 70B8c, 70B6c, 70B4c, 70B2c, 70B9d, 70B7d, 70B5d, 70B3d, and 70B1d are attached to the rear wall 101b.

[0043] Figure 7 is a view of the right side wall 101c of the lower region 101A of the furnace 11 shown in Figure 3, as seen from the outside of the furnace 11. As shown in Figure 7, soot blowers 70R2a, 70R4a, 70R6a, 70R1b, 70R3b, 70R5b, 70R2c, 70R4c, 70R6c, 70R1d, 70R3d, 70R5d, 70R1e, 70R3e, 70R5e, 70R2f, 70R4f, 70R1g, 70R3g, and 70R5g are attached to the right side wall 101c.

[0044] Figure 8 is a view of the left side wall 101d of the lower region 101A of the furnace 11 shown in Figure 3, as seen from the outside of the furnace 11. As shown in Figure 8, soot blowers 70L4a, 70L2a, 70L5b, 70L3b, 70L1b, 70L4c, 70L2c, 70L5d, 70L3d, 70L1d, 70L5e, 70L3e, 70L1e, 70L4f, 70L2f, 70L5g, 70L3g, and 70L1g are attached to the left side wall 101d.

[0045] The control unit 50 controls multiple soot blowers 70, each attached to the front wall 101a, rear wall 101b, right side wall 101c, and left side wall 101d of the furnace wall 101, to independently switch between an inserted state and an withdrawn state. Figure 9 is a graph showing the operating state of the soot blower 70 and the time change of the heat transfer tube temperature. The stopped state is the state in which the motor 73 is stopped when the nozzle block 71 of the soot blower 70 is withdrawn from the furnace 11. The operating state is when the motor 73 is driven to move the nozzle block 71 from the withdrawn state to the inserted state, steam is injected from the nozzle block 71, and then the nozzle block 71 is moved from the inserted state to the withdrawn state.

[0046] As shown in Figure 9, the control unit 50 remains in a stopped state from time t0 to time t1, and then switches a predetermined soot blower 70 to an operating state at time t1. From time t1, the control unit 50 drives the motor 73 to move the soot blower tube 72 from the position shown by the dotted line in Figure 4 to the position shown by the solid line, and switches the soot blower 70 from the withdrawn state to the inserted state.

[0047] The control unit 50 opens the steam pressure control valve 75 in response to the soot blower insertion operation and injects steam into the furnace 11 from the injection holes 71a and 71b. The control unit 50 closes the steam pressure control valve 75 in response to the soot blower withdrawal operation and stops the injection of steam from the injection holes 71a and 71b. After that, the control unit 50 drives the motor 73 from the position shown by the solid line in Figure 4 to the position shown by the dotted line from the completion of injection until time t3 to move the soot blower tube 72 from the position shown by the solid line in Figure 4 to the position shown by the dotted line, and switches the soot blower 70 from the inserted state to the withdrawn state.

[0048] The soot blower 70 shown in Figure 4 is configured to switch between an open state, injecting steam into the furnace 11 from the injection holes 71a and 71b, and a closed state, injecting no steam into the furnace 11, via a steam pressure control valve 75 located in the injection steam supply line 74. However, other configurations are also possible. For example, a stop valve may be placed inside the soot blower tube 72, and the open and closed states may be switched by the stop valve.

[0049] During the soot blower operation period, steam is injected from the injection holes 71a and 71b onto the heat transfer tube 101C, removing any deposits adhering to the heat transfer tube 101C. As a result of removing the deposits, the heat transfer performance of the heat transfer tube 101C increases, and the temperature of the heat transfer tube 101C detected by the temperature detection sensor 60 rises, as shown in Figure 9.

[0050] The calculation unit 80 shown in Figure 1 is a device that calculates a value corresponding to the amount of deposits removed by the steam injection operation, based on the temperature detected by a temperature detection sensor 60 corresponding to a heat transfer tube 101C located near a predetermined soot blower 70 when the predetermined soot blower 70 performs a steam injection operation.

[0051] The calculation unit 80 detects the maximum temperature value (first temperature detection value) T1 detected by the temperature detection sensor 60 during the first period PR1, from a certain time t2 while steam is being injected from the injection holes 71a and 71b until the time t3 when the soot blower 70 is stopped. The control unit 50 also detects the minimum temperature value (second temperature detection value) T2 detected by the temperature detection sensor 60 during the second period PR2, from the time t1 when the soot blower 70 is started until time t2.

[0052] The calculation unit 80 calculates a differential temperature value Tdif as the calculated value, which is the difference obtained by subtracting the temperature value T2 from the temperature value T1. The differential temperature value Tdif is a value that indicates the degree to which the heat transfer performance of the heat transfer tube 101C has improved due to the removal of deposits attached to the heat transfer tube 101C. The larger the differential temperature value Tdif, the greater the amount of deposits removed. The larger the differential temperature value Tdif calculated when the predetermined soot blower 70 is operated, the greater the amount of deposits removed when the predetermined soot blower 70 is operated.

[0053] Therefore, when performing a steam injection operation in which a predetermined soot blower 70 is operated to inject steam onto the surface of the heat transfer tube 101C, calculating a differential temperature value Tdif from the temperature values ​​T1 and T2 detected by multiple temperature detection sensors 60, and displaying the differential temperature value Tdif on the display unit 90 in association with the area where the predetermined soot blower 70 is located is effective for identifying deposits.

[0054] Here, the arrangement of the furnace wall 101, which has a front wall 101a, a right side wall 101c, a rear wall 101b, and a left side wall 101d, the heat transfer tubes 101C, and the temperature detection sensor 60 will be explained with reference to the drawings. Figure 10 is an unfolded view of the furnace wall 101 showing the arrangement of the furnace wall 101, the heat transfer tubes 101C, and the temperature detection sensor 60 (a to t). As shown in Figure 10, the heat transfer tubes 101C are arranged on the furnace wall 101 so as to pass near an installation area that includes multiple installation areas where multiple soot blowers 70 are installed. The installation area is the range that is affected when the soot blowers perform steam injection operations. The temperature detection sensor 60 detects the temperature which changes according to the amount of deposits removed from one or more installation areas included in the multiple installation areas.

[0055] As shown in Figure 10, for example, the heat transfer tube 101C on which the temperature detection sensor 60m is installed is positioned on the furnace wall 101 so as to pass through the installation areas of the soot blowers 70L3g and 70L1g installed on the left wall 101d, the soot blowers 70F5a, 70F6b, 70F8b, and 70F9c installed on the front wall 101a, and the soot blowers 70R1d and 70R3d installed on the right wall 101c.

[0056] The 16 (vertical VD) × 44 (horizontal HD) area demarcated by dotted lines in Figure 10 shows an example of an area demarcated for displaying the calculated values ​​calculated by the calculation unit 80 on the display unit 90. For example, when the soot blower 70L3g performs a steam injection operation, the calculation unit 80 calculates a value for each of the nine areas, each 3 (vertical VD) × 3 (horizontal HD), which includes the area where the soot blower 70L3g is positioned.

[0057] For example, when the calculation unit 80 calculates the calculated value for the rightmost region of the nine regions and the central region in the vertical direction VD, it calculates the differential temperature value Tdif as the calculated value based on the temperature detected by the temperature detection sensor 60m. Alternatively, when the calculation unit 80 calculates the calculated value for the central region of the nine regions, it may calculate the value by adding together the temperature detected by the temperature detection sensor 60m and the temperature detected by the temperature detection sensor 60n, each with a predetermined weight. When the calculation unit 80 starts up multiple soot blowers 70 in sequence with intervals between them to perform a steam injection operation, it sequentially calculates the calculated values ​​for multiple regions, including the region where the soot blowers 70 performing the steam injection operation are located.

[0058] Here, an example of a differential temperature value Tdif calculated from the temperature values ​​T1 and T2 detected by multiple temperature detection sensors 60 when a predetermined soot blower 70 performs steam injection will be explained with reference to the drawings. Figure 11 is a diagram showing the differential temperature value Tdif between the maximum temperature value T1 and the minimum temperature value T2 detected by multiple temperature detection sensors 60 when the soot blower 70 is in operation, divided into sections A to E.

[0059] In Figure 11, the 16 (vertical VD) × 44 (horizontal HD) region demarcated by the dotted line corresponds to the 16 (vertical VD) × 44 (horizontal HD) region demarcated by the dotted line in Figure 10. In Figure 11, the symbols shown in each column indicate the value of the differential temperature value Tdif calculated from the temperature values ​​T1 and T2 detected by multiple temperature detection sensors 60 when the pair of soot blowers 70 in each row are operated. In Figure 11, A, B, C, D, and E each indicate the range of the differential temperature value Tdif, and the relationship is A > B > C > D > E.

[0060] The calculation unit 80 stores in a storage unit (not shown) a table indicating which ranges A, B, C, D, and E the differential temperature value Tdif falls into when multiple temperature detection sensors 60 are detected, as shown in Figure 10. The calculation unit 80 then reads the table stored in the storage unit and, when the soot blower 70 is operated, identifies the maximum value among the multiple differential temperature values ​​Tdif calculated from the difference between the temperature values ​​T1 and T2 detected by the multiple temperature detection sensors 60, and calculates it as the differential temperature value Tdif.

[0061] In Figure 10, the range of the differential temperature value Tdif is divided into five stages: A, B, C, D, and E. However, other configurations are also possible. For example, it may be divided into more than five stages, or the differential temperature value Tdif may be used directly as the table value without dividing it into stages A, B, C, D, and E.

[0062] The display unit 90 is a device that displays the differential temperature value Tdif, which is a calculated value calculated by the calculation unit 80, in correspondence with the position on the furnace wall 101 where a predetermined soot blower 70 is located. Figure 12 is a diagram showing an example in which the differential temperature value Tdif between the maximum temperature value T1 and the minimum temperature value T2 detected by multiple temperature detection sensors 60 when the soot blower 70 is operated is displayed on the display unit 90.

[0063] The images shown in Figure 12, which are represented by five different shades, correspond to the ranges of the five differential temperature values ​​Tdif shown in Figure 11 as A, B, C, D, and E. In this embodiment, the display unit 90 displays multiple differential temperature values ​​(temperature differences) Tdif on a single screen, corresponding to the positions of the furnace wall 101 where the multiple soot blowers 70 are located, when the multiple soot blowers 70 perform steam injection.

[0064] In Figure 12, area A (the area with the largest differential temperature value Tdif) corresponds to the highest density image region in Figure 12, and area B (the area with the next largest differential temperature value Tdif) corresponds to the second highest density image region in Figure 12. In Figure 11, area E (the area with the smallest differential temperature value Tdif) corresponds to the lowest density image region in Figure 12, area D (the area with the next smallest differential temperature value Tdif) corresponds to the second lowest density image region in Figure 12, and area C corresponds to the third lowest density image region in Figure 12.

[0065] The operator of the boiler system 100 can intuitively recognize which area of ​​the furnace wall 101 will have a large differential temperature value Tdif (i.e., a large amount of deposits removed) when a predetermined soot blower 70 performs steam injection, by viewing the grayscale image shown in Figure 12 on the display unit 90. For example, the operator can identify the soot blower 70 that was operated when the differential temperature value Tdif was large (i.e., a large amount of clinker was removed) from the grayscale image, and set the control unit 50 to shorten the operating interval at which the identified soot blower 70 performs steam injection. It should be noted that a large amount of clinker removal indicates that clinker is likely to accumulate under boiler conditions such as the type of coal being burned and the burner operation pattern, and that the injection interval of the relevant soot blower is still too long.

[0066] Next, with reference to Figure 13, the process by which a predetermined soot blower 70 performs a steam injection operation will be described. Figure 13 is a flowchart showing the process by which a predetermined soot blower 70 performs a steam injection operation.

[0067] In step S101, the control unit 50 controls the soot blower 70 to start its steam injection operation.

[0068] In step S102, the calculation unit 80 detects the maximum temperature value (first temperature detection value) T1 detected by the multiple temperature detection sensors 60 during the first period PR1, from a certain time t2 while steam is being injected from the injection holes 71a and 71b to a certain time t3 when the soot blower 70 is stopped. The control unit 50 also detects the minimum temperature value (second temperature detection value) T2 detected by the multiple temperature detection sensors 60 during the second period PR2, from the time t1 when the soot blower 70 is started to a certain time t2 while steam is being injected from the injection holes 71a and 71b.

[0069] In step S103, the calculation unit 80 calculates a differential temperature value Tdif, which is the difference obtained by subtracting temperature value T2 from temperature value T1, based on the temperature values ​​T1 and T2 detected by the multiple temperature detection sensors 60, and associates it with the multiple temperature detection sensors 60. Then, the control unit 50 calculates the maximum value among the multiple differential temperature values ​​Tdif calculated by the multiple temperature detection sensors 60.

[0070] In step S104, the display unit 90 displays a grayscale image corresponding to the differential temperature value Tdif calculated by the calculation unit 80 in step S103, in association with the position on the furnace wall 101 where the predetermined soot blower 70, which was operated to inject steam in step S101, is located.

[0071] In step S105, the control unit 50 sets a predetermined operating interval for the soot blower 70 based on the maximum value of the differential temperature value Tdif calculated in step S103. The control unit 50 sets the operating interval such that it becomes shorter as the maximum value increases.

[0072] In step S106, the control unit 50 controls the operation of a predetermined soot blower 70 to stop, and terminates the processing of this flowchart. The control unit 50 performs the series of processes shown in the flowchart in Figure 13 for each of the multiple soot blowers 70. The display unit 90 displays a grayscale image corresponding to the differential temperature value Tdif, corresponding to the position of the multiple soot blowers 70 on the furnace wall 101. The control unit 50 also sets an operating interval for each of the multiple soot blowers 70.

[0073] When the series of processes shown in the flowchart in Figure 13 are executed for each of the multiple soot blowers 70, the display unit 90 updates its display content after all of the multiple soot blowers 70 have been operated. Alternatively, when the series of processes shown in the flowchart in Figure 13 are executed for each of the multiple soot blowers 70, the display unit 90 may update only the grayscale image (image corresponding to the differential temperature value Tdif) displayed in the display area corresponding to a predetermined soot blower 70 after that predetermined soot blower 70 has performed a steam injection operation. In this case, the grayscale image displayed in some of the display areas is updated each time any of the multiple soot blowers 70 performs a steam injection operation, and by operating all of the multiple soot blowers 70, the grayscale image displayed in all of the display areas of the display unit 90 is updated.

[0074] Next, referring to Figure 14, the process of operating a predetermined soot blower 70 at a set operating interval will be described. Figure 13 is a flowchart showing the process of operating a predetermined soot blower 70 at a set operating interval.

[0075] In step S201, the control unit 50 controls the soot blower 70 to start its steam injection operation. In step S202, the control unit 50 controls the steam injection operation of a predetermined soot blower 70 to stop.

[0076] In step S203, the control unit 50 determines whether the boiler 10 is in operation. If it is YES, the control unit 50 proceeds to step S204. If it is NO, the control unit 50 performs an action to terminate the process in this flowchart.

[0077] In step S204, the control unit 50 determines whether the predetermined operating interval for the soot blower 70 set in step S105 of Figure 13 has elapsed. If YES, the process proceeds to step S201 to perform the steam injection operation of the predetermined soot blower 70 again. If NO, the process in step S204 is repeated.

[0078] The boiler system 100 of this embodiment described above provides the following functions and effects. According to the boiler system 100 of this embodiment, the control unit 50 controls the operation of a predetermined soot blower 70 based on a plurality of temperature values ​​T1 detected by a plurality of temperature detection sensors 60 during a first period PR1 from the start of the predetermined soot blower 70 to the steam injection. Since the first period PR1 is the period during steam injection when the predetermined soot blower 70 is inserted and injecting steam, the temperature of the heat transfer tube 101C after the clinker has been removed by the steam injection can be detected. The higher the temperature of the heat transfer tube 101C after the clinker has been removed, the greater the amount of clinker removed. Therefore, by controlling the operation of the predetermined soot blower 70 based on a plurality of temperature values ​​T1, the soot blower 70 can be operated appropriately according to the furnace conditions, such as the amount of clinker attached.

[0079] Furthermore, according to the boiler system 100 of this embodiment, in the second period PR2, which includes the state before the first period PR1 and before the clinker is removed, multiple temperature values ​​T2 detected by multiple temperature detection sensors 60 can be detected, and multiple differential temperature values ​​Tdif, which are the difference between multiple temperature values ​​T1 and multiple temperature values ​​T2, can be calculated. These differential temperature values ​​Tdif are the temperature difference before and after the clinker is removed, and correspond to the amount of clinker removed, so the soot blower 70 can be operated appropriately according to the furnace conditions such as the amount of clinker attached.

[0080] Furthermore, according to the boiler system 100 of this embodiment, multiple differential temperature values ​​Tdif are displayed in association with the temperature detection sensor 60 corresponding to each differential temperature value Tdif. Therefore, the operator of the boiler system 100 can intuitively recognize at which location in the furnace 11 the temperature difference becomes large (i.e., the amount of clinker removed increases).

[0081] Furthermore, according to the boiler system 100 of this embodiment, the first period PR1 is a steam injection period in which steam is injected with a predetermined soot blower 70 inserted, so the multiple temperature values ​​T1 correspond to the amount of clinker removed. Therefore, the soot blower 70 can be operated appropriately according to the state of the furnace 11, such as the amount of clinker buildup.

[0082] In the boiler system 100 of this embodiment, multiple temperature values ​​T1 are displayed in association with the temperature detection sensor 60 corresponding to each temperature value T1, so that the operator of the boiler system 100 can intuitively recognize at which location in the furnace 11 the temperature difference becomes large (i.e., the amount of clinker removed increases).

[0083] [Other embodiments] In the above description, the display unit 90 of the boiler system 100 is shown to display multiple differential temperature values ​​Tdif on a single screen, corresponding to the positions of the multiple soot blowers 70 on the furnace wall 101 where the multiple soot blowers 70 are located, when the multiple soot blowers 70 perform steam injection. However, other configurations are possible. For example, the display unit 90 may display the differential temperature values ​​Tdif calculated by the calculation unit 80 on different screens for each of the multiple furnace walls 101, corresponding to the positions of the multiple soot blowers 70 on the multiple furnace walls 101. That is, the display unit 90 may switch to display grayscale images corresponding to the differential temperature values ​​Tdif corresponding to the front wall 101a, right wall 101c, rear wall 101b, and left wall 101d on separate screens for each of the front wall 101a, right wall 101c, rear wall 101b, and left wall 101d.

[0084] In the above description, the display unit 90 of the boiler system 100 is shown to display a grayscale image corresponding to the differential temperature value Tdif calculated by the calculation unit 80, but other configurations are also possible. For example, other display content that allows the magnitude of the numerical value to be visually perceived may be displayed, such as a three-dimensional image having a height in three-dimensional space corresponding to the differential temperature value Tdif calculated by the calculation unit 80.

[0085] The boiler systems and control methods for boiler systems described in each embodiment above can be understood, for example, as follows.

[0086] A boiler system according to a first aspect of the present disclosure comprises: a furnace (11) composed of a furnace wall having a plurality of heat transfer tubes (101C) through which fluid flows; a combustion device (20) that generates combustion gas by injecting fuel and combustion air into the furnace; a plurality of soot blowers (70) capable of performing a steam injection operation to inject steam onto the surface of the heat transfer tubes; a plurality of temperature detection units (60) for detecting the temperature of the plurality of heat transfer tubes; a calculation unit (80) that calculates a calculated value corresponding to the amount of deposits removed by the steam injection operation based on the temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower when the predetermined soot blower performs the steam injection operation; and a display unit (90) that displays the calculated value in correspondence with the position on the furnace wall where the predetermined soot blower is located.

[0087] When a designated soot blower performs a steam injection operation, deposits adhering to the heat transfer tubes passing near the installation area where the designated soot blower is installed are removed, and the temperature of the fluid flowing through the heat transfer tubes rises. Therefore, when the designated soot blower performs a steam injection operation, the temperature detected by the temperature detection unit corresponding to the heat transfer tubes located near the designated soot blower will correspond to the amount of deposits removed from the heat transfer tubes.

[0088] According to the boiler system of the first aspect of this disclosure, when a predetermined soot blower performs a steam injection operation, a calculated value corresponding to the amount of deposits removed by the steam injection operation is calculated based on the temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower. The calculated value calculated by the calculation unit is then displayed by the display unit in correspondence with the position on the furnace wall where the predetermined soot blower is located. This makes it easy to visually confirm the condition of the deposits removed when the soot blower performs a steam injection operation in which steam is injected onto the surface of the heat transfer tube.

[0089] A boiler system according to a second aspect of the present disclosure further comprises the following configuration in the first aspect: the calculated value is a value corresponding to the temperature difference between a first temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower before the steam injection operation is performed, and a second temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower after the steam injection operation is performed.

[0090] The temperature difference between a first temperature detected by a temperature detection unit corresponding to a heat transfer tube located near a predetermined soot blower before the predetermined soot blower performs a steam injection operation, and a second temperature detected by a temperature detection unit corresponding to a heat transfer tube located near the predetermined soot blower after the predetermined soot blower performs a steam injection operation, corresponds to the amount of deposits removed from the heat transfer tube. According to the boiler system of the second aspect of this disclosure, by displaying the calculated value corresponding to this temperature difference on a display unit corresponding to the position on the furnace wall where the predetermined soot blower is located, the status of the deposits removed when the steam injection operation is performed can be easily visually confirmed.

[0091] A boiler system according to a third aspect of the present disclosure further comprises the following configuration in the first or second aspect: the furnace has a plurality of furnace walls, each of which a soot blower is arranged; and the display unit displays the calculated value calculated by the calculation unit on a single screen, corresponding to the position on the plurality of furnace walls where the plurality of soot blowers are arranged.

[0092] According to the boiler system of the third aspect of this disclosure, the condition of deposits removed when multiple soot blowers perform a steam injection operation in which steam is injected onto the surface of heat transfer tubes can be easily viewed on a single screen in correspondence with the location on all furnace walls of the furnace wall.

[0093] A boiler system according to a fourth aspect of the present disclosure further comprises the following configuration in the first or second aspect: the furnace has a plurality of furnace walls, each of which a soot blower is arranged; and the display unit displays the calculated value calculated by the calculation unit on a different screen for each of the plurality of furnace walls, corresponding to the position of the plurality of soot blowers on the plurality of furnace walls.

[0094] According to the boiler system of the fourth aspect of this disclosure, the condition of deposits removed when multiple soot blowers perform a steam injection operation in which steam is injected onto the surface of heat transfer tubes can be easily visualized on a different screen for each of the multiple furnace walls, corresponding to their positions on the multiple furnace walls of the furnace wall.

[0095] A boiler system according to a fifth aspect of this disclosure further comprises the following configuration in the first or second aspect: The display unit updates the calculated value displayed in the display area corresponding to the predetermined soot blower after the predetermined soot blower has performed the steam injection operation.

[0096] According to the boiler system of the fifth aspect of this disclosure, a calculated value displayed in a display area corresponding to a predetermined soot blower can be sequentially updated each time a predetermined soot blower performs a steam injection operation.

[0097] A boiler system according to a sixth aspect of this disclosure further comprises the following configuration in the first or second aspect: a control unit (50) that controls a plurality of soot blowers, the control unit controlling the operating interval at which the soot blowers perform steam injection based on the calculated value calculated by the calculation unit.

[0098] According to the boiler system of the sixth aspect of this disclosure, the operating interval at which the soot blowers perform steam injection can be appropriately controlled according to the condition of the deposits removed when the soot blowers perform steam injection operations in which they inject steam onto the surface of the heat transfer tubes.

[0099] A boiler system according to a seventh aspect of this disclosure further comprises the following configuration in the first or second aspect: the heat transfer tubes are arranged to pass near a plurality of installation areas where a plurality of soot blowers are installed, and the temperature detection unit detects a temperature that changes according to the amount of deposits removed from one or more of the installation areas included in the plurality of installation areas.

[0100] According to the boiler system of the seventh aspect of this disclosure, a predetermined heat transfer tube is arranged to pass near multiple installation areas where multiple soot blowers are installed. Therefore, using a single temperature detection unit corresponding to the predetermined heat transfer tube, multiple calculated values ​​corresponding to the amount of deposits removed in the multiple installation areas can be calculated and the calculated values ​​can be displayed in association with the multiple installation areas. In other words, without having to place a temperature detection unit in each of the multiple installation areas, calculated values ​​corresponding to multiple installation areas can be calculated using a single temperature detection unit.

[0101] A boiler system according to the eighth aspect of this disclosure further comprises the following configuration in the seventh aspect: The calculation unit calculates the calculated value based on the temperatures detected by a plurality of temperature detection units corresponding to a plurality of heat transfer tubes passing near a predetermined installation area.

[0102] According to the boiler system of the eighth aspect of this disclosure, a calculated value can be calculated with high accuracy based on the temperature detected by a plurality of temperature detection units corresponding to a plurality of heat transfer tubes passing near a predetermined installation area.

[0103] A boiler control method according to a ninth aspect of the present disclosure, the boiler system comprises a furnace configured with a furnace wall having a plurality of heat transfer tubes through which fluid flows; a combustion device that generates combustion gas by injecting fuel and combustion air into the furnace; a plurality of soot blowers capable of performing a steam injection operation to inject steam onto the surface of the heat transfer tubes; and a plurality of temperature detection units for detecting the temperatures of the plurality of heat transfer tubes, the method comprising: a temperature detection step (S102) in which the temperature detection units detect the temperature of the heat transfer tubes located near a predetermined soot blower when a predetermined soot blower performs the steam injection operation; a calculation step (S103) in which a calculated value is calculated based on the temperature detected in the temperature detection step, corresponding to the amount of deposits removed by the steam injection operation; and a display step (S104) in which the calculated value is displayed in correspondence with the position on the furnace wall in which the predetermined soot blower is located.

[0104] According to the boiler control method of the ninth aspect of this disclosure, when a predetermined soot blower performs a steam injection operation, a calculated value corresponding to the amount of deposits removed by the steam injection operation is calculated based on the temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower. The calculated value calculated by the calculation process is then displayed in correspondence with the position on the furnace wall where the predetermined soot blower is located. This makes it easy to visually confirm the condition of the deposits removed when the soot blower performs a steam injection operation in which steam is injected onto the surface of the heat transfer tube. [Explanation of Symbols]

[0105] 10 Boilers 11 Furnace 12 Combustion gas passage 13 Flue 20 Combustion device 50 Control Unit 60 Temperature detection sensors 70 Soot Blower 80 Calculation Unit 90 Display section 100 Boiler Systems 101 Furnace wall 101A Lower area 101B Above Area 101C Legendary Heat Pipe 101a Anterior wall 101b Rear Wall 101c Right side wall 101d Left side wall

Claims

1. A furnace is composed of a furnace wall having multiple heat transfer tubes through which fluid flows, A combustion device that injects fuel and combustion air into the furnace to generate combustion gas, Multiple soot blowers capable of performing a steam injection operation to inject steam onto the surface of the heat transfer tube, Multiple temperature detection units for detecting the temperatures of multiple heat transfer tubes, A calculation unit calculates a calculated value corresponding to the amount of deposits removed by the steam injection operation, based on the temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower when the predetermined soot blower performs the steam injection operation. A boiler system comprising: a display unit that displays the calculated value in correspondence with the position on the furnace wall where the predetermined soot blower is located.

2. The boiler system according to claim 1, wherein the calculated value is a value corresponding to the temperature difference between a first temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower before the steam injection operation is performed, and a second temperature detected by the temperature detection unit corresponding to the heat transfer tube located near the predetermined soot blower after the steam injection operation is performed.

3. The furnace has a plurality of furnace walls, each of which the soot blower is arranged. The boiler system according to claim 1 or 2, wherein the display unit displays the calculated value calculated by the calculation unit on a single screen in correspondence with the positions of the multiple soot blowers arranged in the multiple furnace walls.

4. The furnace has a plurality of furnace walls, each of which the soot blower is arranged. The boiler system according to claim 1 or 2, wherein the display unit displays the calculated value calculated by the calculation unit on a different screen for each of the multiple furnace walls where the multiple soot blowers are arranged, corresponding to the positions on the multiple furnace walls.

5. The boiler system according to claim 2, wherein the display unit updates the calculated value displayed in the display area corresponding to the predetermined soot blower after the predetermined soot blower has performed the steam injection operation.

6. The system includes a control unit that controls multiple soot blowers, The boiler system according to claim 1 or 2, wherein the control unit controls the operating interval at which the soot blower performs the steam injection operation based on the calculated value calculated by the calculation unit.

7. The heat transfer tube is arranged to pass near multiple installation areas where multiple soot blowers are installed. The boiler system according to claim 1 or 2, wherein the temperature detection unit detects a temperature that changes according to the amount of deposits removed from one or more of the installation areas included in the plurality of installation areas.

8. The boiler system according to claim 7, wherein the calculation unit calculates the calculated value based on the temperatures detected by a plurality of temperature detection units corresponding to a plurality of heat transfer tubes passing near a predetermined installation area.

9. A method for controlling a boiler system, The boiler system is A furnace is composed of a furnace wall having multiple heat transfer tubes through which fluid flows, A combustion device that injects fuel and combustion air into the furnace to generate combustion gas, Multiple soot blowers capable of performing a steam injection operation to inject steam onto the surface of the heat transfer tube, It has multiple temperature detection units for detecting the temperatures of multiple heat transfer tubes, A temperature detection step in which the temperature detection unit detects the temperature of the heat transfer tube located near the predetermined soot blower when the predetermined soot blower performs the steam injection operation, A calculation step that calculates a value corresponding to the amount of deposits removed by the steam injection operation based on the temperature detected in the temperature detection step, A control method for a boiler system comprising: a display step of displaying the calculated value in correspondence with the position on the furnace wall where the predetermined soot blower is located.

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