Fluidized bed operation control device, fluidized bed operation method, and fluidized bed operation control program

Abstract

To provide a fluidized bed operation control device, a fluidized bed operation method, and a fluidized bed operation control program, for heating fuel while suppressing adhesion of a fluidizing material.SOLUTION: The fluidized bed operation control device controlling a fluidized bed device that heats fuel including biomass while fluidizing the fuel with a fluidizing material, includes: a measurement unit for acquiring a content of alkali metal and a content of chlorine in the fuel including biomass; a temperature acquiring unit for acquiring a temperature of the fluidizing bed where the fuel is fluidized with the fluidizing material of the fluidized bed device; and a control unit for calculating an amount of adhering material on the basis of the content of the alkali metal and the temperature of the fluidized bed to control operating conditions of the fluidized bed device on the basis of the calculated amount of the adhering material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a fluidized bed operation control device, a fluidized bed operation method, and a fluidized bed operation control program.

Background Art

[0002] As a device for burning fuel, for example, as in Patent Document 1, there is a fluidized bed boiler that gasifies fuel and a fluidizing material while flowing and mixing them in a combustion chamber. There is also a combustion device that burns in a fluidized bed, which is a device that causes fluidization using a fluidizing material.

Prior Art Documents

Patent Documents

[0003] [[ID=2​​​​​​​​​​​​​​​​​​​​​​To achieve the above objective, the fluidized bed operation control device is a fluidized bed operation control device that controls a fluidized bed apparatus that heats a biomass-containing fuel while it is fluidized with a fluidizing agent, and includes: a measurement unit that acquires the alkali metal content and chlorine content of the biomass-containing fuel; a temperature acquisition unit that acquires the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing agent and the fuel are fluidized; and a control unit that calculates the amount of deposits based on the alkali metal content and the temperature of the fluidized bed, and controls the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

[0007] To achieve the above objective, a fluidized bed operation method is a fluidized bed operation control method for controlling a fluidized bed apparatus that heats a biomass-containing fuel while it is fluidized with a fluidizing agent, and includes the steps of: obtaining the alkali metal content and chlorine content of the biomass-containing fuel; obtaining the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing agent and the fuel are fluidized; calculating the amount of deposits based on the alkali metal content and the temperature of the fluidized bed, and controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

[0008] To achieve the above objective, the fluidized bed operation control program is a fluidized bed operation control program that controls a fluidized bed apparatus that heats a biomass-containing fuel while it is fluidized with a fluidizing agent, and causes a computer to perform the following steps: obtaining the alkali metal content and chlorine content of the biomass-containing fuel; obtaining the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing agent and the fuel are fluidized; calculating the amount of deposits based on the alkali metal content and the temperature of the fluidized bed, and controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits. [Effects of the Invention]

[0009] According to this disclosure, fuel can be heated while suppressing the adhesion of the fluid material to heat transfer tubes and the like, as well as the adhesion of the fluid materials to each other. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram showing the fluidized bed boiler of this embodiment. [Figure 2] Figure 2 is a schematic diagram showing a fluidized bed furnace according to this embodiment. [Figure 3] Figure 3 is a schematic diagram showing an example of a test apparatus. [Figure 4] Figure 4 is a graph showing the relationship between combustion temperature and the generated gas. [Figure 5] Figure 5 is a graph showing the measurement results of the relationship between KCl concentration and attached substances. [Figure 6] Figure 6 is a graph showing the measurement results of the relationship between temperature and the amount of Cl in deposits on the fluid material. [Figure 7] Figure 7 is a graph showing the measurement results of the relationship between temperature and the amount of K adhering to the fluid material. [Figure 8] Figure 8 is a flowchart showing an example of the processing performed by the control device. [Modes for carrying out the invention]

[0011] Preferred embodiments will be described in detail below with reference to the attached drawings. However, this disclosure is not limited to these embodiments, and if there are multiple embodiments, they may be combinations of these embodiments. Hereinafter, the embodiments will be described in the case of a fluidized bed boiler in which fuel is burned in a fluidized bed, but the invention is not limited thereto. This disclosure can also be used in a gasifier in which fuel and a fluidizing agent are fluidized in a fluidized bed while the fuel is gasified. In other words, this embodiment can be used in various devices for heating fuel in a fluidized bed. Here, the fuel includes biomass. Specifically, the fuel is a fuel with a high content of alkali metals and chlorine and a low content of sulfur, such as biomass made from grass or wood. Note that the fuel may include biomass, and may also include fuels other than biomass. Here, the fuel of this disclosure has an alkali metal content of 0.01 wt% or more, a chlorine content of 0.05 wt% or more, and a sulfur content of 0.01 wt% or less.

[0012] Figure 1 is a schematic diagram showing a fluidized bed boiler 10 equipped with a fluidized bed furnace 20 according to this embodiment of the present invention, and Figure 2 is a schematic configuration diagram showing the fluidized bed furnace 20. The fluidized bed boiler 10 includes a fluidized bed furnace 20 that burns a fluidized material (e.g., sand) and fuel (e.g., biomass) in a combustion chamber 21 while fluidizing and mixing them, a cyclone 11 that separates the combustion gas discharged from the fluidized bed furnace 20 from the fluidized material, an exhaust passage 12 connected to the cyclone 11, an internal heat exchanger 13 located downstream of the exhaust passage 12, an air preheater 14, a dust collector 15, a chimney 16, an air supply pipe 17 that introduces air from the air preheater 14 into the fluidized bed furnace 20, and an air fan 18 that supplies air to the air supply pipe 17.

[0013] As shown in Figures 1 and 2, the fluidized bed furnace 20 includes a combustion chamber 21, a diffuser pipe 30, a fluidized material supply unit 32, a fuel supply unit 34, a heating device 36, and a fluidized material circulation unit 40.

[0014] The combustion chamber 21 contains a diffuser pipe 30, a fluid material supply unit 32, a fuel supply unit 34, a heating device 36, and part of a fluid material circulation unit 40. The combustion chamber 21 is also equipped with a starting burner for initiating combustion and multiple air supply units for supplying secondary, tertiary, and quaternary air into the combustion chamber 21. The combustion chamber 21 has a bottom surface 22 located inside the container 212. The bottom surface 22 has numerous holes through which air can pass but fuel and fluid material cannot. Fluid material and fuel are supplied to the fluidized bed 23 on the upper surface of the bottom surface 22 of the combustion chamber 21. Primary air is supplied to the combustion chamber 21 from the diffuser pipe 30 located below the bottom surface 22, and the primary air flows into the fluidized bed 23 through the holes in the bottom surface 22, causing the fuel and fluid material in the fluidized bed 23 to flow in the flow direction 23a. As a result, the fluid material and fuel flow within the fluidized bed 23.

[0015] The air diffuser pipe 30 fluidly mixes fuel and the fluid material and supplies primary air, which is also used as combustion air, into the combustion chamber 21. The air diffuser pipe 30 penetrates the combustion chamber 21 and is connected to an intake manifold 24 disposed outside the combustion chamber 21. An air supply pipe 17 is connected to the intake manifold 24, and high-temperature air heated by the air preheater 14 is supplied via the air supply pipe 17. As shown in FIG. 2, the air diffuser pipe 30 is formed with a plurality of air supply holes 30o that can blow primary air into the combustion chamber 21 at intervals along the axial direction. In this embodiment, by using the air diffuser pipe 30, primary air is supplied to the fluidized bed 23 on average. However, if the space below the bottom surface 22 of the combustion chamber 21 can be made into a manifold and the pressure can be equalized, air may be supplied from the intake manifold 24 to the side surface of the combustion chamber 21 without using the air diffuser pipe 30.

[0016] The fluid material supply unit 32 is connected to the combustion chamber 21 by a supply pipe 32a and supplies the fluid material to the combustion chamber 21. The fuel supply unit 34 is connected to the combustion chamber 21 and supplies fuel to the combustion chamber 21.

[0017] The heating device 36 is a heat source for heating the fuel and the fluid material in the fluidized bed 23. It has a first heating part 36a and a second heating part 36b. The first heating part 36a and the second heating part 36b have heat transfer pipes disposed inside the fluidized bed 23, and by flowing a heated heat medium through the heat transfer pipes, the fuel and the fluid material flowing in the fluidized bed 23 are heated. The second heating part 36b is disposed in a region above the first heating part 36a in the vertical direction. The heating device 36 may set the heat medium flowing through the first heating part 36a and the heat medium flowing through the second heating part 36b at different temperatures. For example, the heating device 36 may set the heat medium flowing through the second heating part 36b at a higher temperature than the heat medium flowing through the first heating part 36a. Thereby, the region above the fluidized bed in the vertical direction can be made hotter. Also, the heating device 36 can adjust the temperature of the heat medium to adjust the temperature of the fluidized bed 23.

[0018] The fluid material circulation section 40 recovers the fluid material in the combustion chamber 21, regenerates it, and supplies it to the fluid material supply section 32. The fluid material circulation section 40 includes a circulation path 42, a separation section 44, and a cleaning section 46. The circulation path 42 connects the bottom surface 22 of the combustion chamber 21 and the fluid material supply section 32. The circulation path 42 recovers the fluid material from the bottom surface 22 of the combustion chamber 21, processes it, and then supplies it to the fluid material supply section 32. The separation section 44 is arranged in the circulation path 42. The separation section 44 separates impurities contained in the fluid material discharged from the combustion chamber 21 and non-regenerable fluid material. The impurities include fuel. The cleaning section 46 is arranged downstream of the separation section 44 in the circulation path 42. The cleaning section 46 cleans the fluid material that has passed through the separation section 44 and removes the deposits on the fluid material. The cleaning section 46 performs cleaning using water or a cleaning liquid.

[0019] Further, the fluidized bed boiler 10 includes a temperature measurement section 50, a fuel measurement section 52, a fluid material measurement section 54, and a control device 70 as control functions for controlling the operation. The fluidized bed boiler 10 controls the operation of the fluidized bed boiler 10 with the control device 70 based on the information acquired by the temperature measurement section 50, the fuel measurement section 52, and the fluid material measurement section 54.

[0020] The temperature measurement section 50 measures the temperature of the fluidized bed 23. The fuel measurement section 52 acquires information on the components of the fuel supplied to the combustion chamber 21. The fuel measurement section 52 may analyze the fuel to acquire the component information or estimate the components from the fuel information. The fluid material measurement section 54 detects the components and amount of the deposits on the fluid material. The fluid material measurement section 54 may sample the fluid material.

[0021] The control device 70 is a fluidized bed operation control device and includes a control unit 72 and a storage unit 74. The control unit 72 is an arithmetic unit and includes an arithmetic circuit such as a CPU (Central Processing Unit). The control unit 72 performs various control functions by processing programs stored in the storage unit 74. The control unit 72 controls the operation of the fluidized bed boiler 10 based on the information stored in the storage unit 74 and the information acquired by the temperature measurement unit 50, fuel measurement unit 52, and fluid material measurement unit 54. The control unit 72 controls the operating conditions, such as the operating period (the period until maintenance is performed), operating temperature, fuel input amount, and fluid material input amount.

[0022] The memory unit 74 is a memory that stores various information such as the calculation contents and programs of the control unit 72, and includes at least one of the following: RAM (Random Access Memory), main memory such as ROM (Read Only Memory), and external memory such as HDD (Hard Disk Drive). The program for the control unit 72 stored in the memory unit 74 may be stored on a recording medium that can be read by the control device 70.

[0023] In the fluidized bed boiler 10, fluidized material is supplied to the combustion chamber 21 of the fluidized bed furnace 20 from the fluidized material supply unit 32, and fuel is supplied from the fuel supply unit 34. In the fluidized bed boiler 10, high-temperature air heated by the air preheater 14 is introduced to the fluidized bed furnace 20 via the air supply pipe 17 and intake manifold 24 into a plurality of diffuser pipes 30. Primary air is supplied into the combustion chamber 21 from a plurality of air supply holes 30o formed in each diffuser pipe 30, causing the fluidized material and fuel to fluidize and mix, and to flow in the fluidized bed 23. The fluidized bed 23 is also heated by the heating device 36. This causes the fuel in the fluidized bed 23 of the combustion chamber 21 to burn. In the fluidized bed boiler 10, the combustion gas generated by combustion is led along with the fluidized material to the cyclone 12, where the combustion gas and fluidized material are separated by the cyclone 12. The combustion gas separated by cyclone 12 is guided to the exhaust passage 12, passes through the internal heat exchanger 13 and air preheater 14, exchanges heat with the air introduced into the fluidized bed furnace 20, and then, after removing fly ash and other contaminants through the dust collector 15, is released into the atmosphere through the chimney 16. Meanwhile, the high-temperature fluidized material separated by cyclone 21 is recirculated into the combustion chamber 21 of the fluidized bed furnace 20.

[0024] When burning fuel in a fluidized bed having an alkali metal content of 0.01 wt% or more, a chlorine content of 0.05 wt% or more, and a sulfur content of 0.01 wt% or less, the control device 70 obtains a pre-calculated relationship between the concentration of the alkali metal-chlorine reaction product in the fluidized bed, the temperature of the fluidized bed, and the deposition rate of deposits. Based on the obtained relationship, the fuel components of the fluidized bed boiler 10, and the temperature of the fluidized bed, the control device 70 controls the operating conditions.

[0025] Figure 3 is a schematic diagram showing an example of a test apparatus. The test apparatus 100 shown in Figure 3 reproduces the environment of a fluidized bed 23 and evaluates deposits on the heat transfer tubes of the heating device in the fluidized bed and deposits on the fluid material. The test apparatus 100 includes a housing 102, a test pipe 106, a cooling unit 107, and a gas supply unit 108. The fluid material 104 is placed inside the housing 102. The test pipe 106 is inserted into the part of the housing 102 where the fluid material 104 is placed. The end of the test pipe 106 is on the gas supply unit 108 side. It has a folded shape at the lower vertical end. The folded portion 110 of the test pipe 106 is the area to be evaluated for deposits. The cooling unit 107 supplies a cooling medium to the test pipe 106. The cooling medium is a liquid, such as silicone oil, or a gas. The cooling unit 107 maintains the test piping 106 at a predetermined temperature, for example, in the range of 350°C to 4550°C, which simulates the temperature of a heat transfer tube. The gas supply unit 108 is connected to the vertically lower end of the housing 102 and supplies a gas containing KCl at a predetermined temperature, for example, 700°C or 750°C.

[0026] The test apparatus 100 reproduces the fluidized bed environment of the combustion furnace of a fluidized bed boiler 10 by supplying gas containing KCl at 700°C and 750°C from the gas supply unit 108 to the housing 102, while cooling the folded section 110 from 350°C to 550°C. Specifically, by supplying gas containing KCl to the heated fluidized material 104 and the folded section 110, the heated fluidized material in the fluidized bed is simulated in the fluidized material 104, and the environment of the heat transfer tubes and furnace wall is simulated in the folded section 110. The test apparatus 100 performed tests for a predetermined time in multiple combinations by changing the temperature of the gas supply unit 108, the temperature of the folded section, and the concentration of the supplied KCl, and evaluated the adhesion of the folded section 110 and the adhesion of the fluidized material 104 after the predetermined time had elapsed.

[0027] Figure 4 is a graph showing the relationship between combustion temperature and the generated gas. In the test apparatus 100, the ratio of alkali metal and chlorine compounds, in this embodiment KCl, to the total chlorine contained in the emitted gas changes according to the gas temperature (combustion temperature). Similarly, it changes according to the combustion temperature of the combustion chamber 21 of the fluidized bed boiler 10. In Figure 4, the vertical axis represents alkali metal and chlorine compounds, in this embodiment the ratio of KCl (KCl / total Cl) [mol / mol], and the horizontal axis represents the gas temperature. As shown in Figure 4, the generation of KCl begins at a gas temperature of approximately 580°C, and the ratio of KCl increases in proportion to the rise in temperature.

[0028] Figure 5 is a graph showing the measurement results of the relationship between KCl concentration and deposits. In Figure 5, the vertical axis represents the content in the deposits [mg / cm³]. 2 ], in other words, the measurement results of potassium and chlorine deposits attached to the folded portion 110, with the horizontal axis representing the concentration of KCl in the gas [ppm]. In Figure 5, the temperature of the gas supplied from the gas supply unit 108, i.e., the temperature of the part corresponding to the fluidized bed, was set to 750°C, and the temperature of the folded portion 110 was set to 500°C. The reference line 150 shown in Figure 5 represents the deposit content that results in a deposit thickness of 5.8 mm in one year.

[0029] Next, Figure 6 is a graph showing the measurement results of the relationship between temperature and the amount of Cl in the deposits of the fluidized material. In Figure 6, the vertical axis is the chlorine content [mg / cm³] in the deposits of the fluidized sand (fluidized material). 2 The measurement results for [ ] are shown, with the horizontal axis representing the temperature of the folded portion 110. Figure 7 is a graph showing the measurement results of the relationship between temperature and the amount of K in the deposits of the fluid material. In Figure 7, the vertical axis represents the potassium content [mg / cm³] in the deposits of the fluid sand (fluid material). 2 The measurement results for [ ] are shown, with the horizontal axis representing the temperature of the folded section 110. The agglomerate particles in the test results shown in Figures 6 and 7 are particles that have grown to a predetermined size or larger due to the adhesion of deposits to the fluid material, and the fluid material itself adhering to the deposits. "Agglomerate particles present" indicates a test in which agglomerate particles were generated in the fluid material. The Tb temperature is the temperature of the fluidized bed. As shown in Figures 6 and 7, it can be seen that agglomerate particles are generated when the amount of potassium and chlorine in the deposits exceeds a predetermined level.

[0030] Figure 8 is a flowchart showing an example of the control device's processing. The control device 70 controls the operating conditions based on the relationships shown in Figures 5 to 8, as well as the fuel components, the fluidized bed temperature, and measurement results during operation. For example, the control device 70 acquires information on the relationship between KCl concentration and deposition rate (step S20).

[0031] The control device 70 acquires information on the fuel composition (step S22). The control device 70 acquires information on the fuel composition, the proportion of alkali metals, and the proportion of chlorine from the fuel measuring unit 52.

[0032] The control device 70 acquires information on the temperature of the fluidized bed (step S24). The control device 70 acquires information on the temperature of the fluidized bed from the temperature measuring unit 50. Alternatively, the control device 70 may acquire temperature information, i.e., the temperature set value, from the operation plan or operating conditions of the fluidized bed boiler.

[0033] The control device 70 calculates the amount of deposits (step S26). Based on the relationship obtained in step S20, the ratio of the fuel components to be evaluated obtained in step S22, and the information on the temperature of the fluidized bed obtained in step S24, the control device 70 calculates the amount of deposits in the fluidized bed, for example, the deposit rate.

[0034] The control device 70 determines the operating conditions based on the amount of deposit (step S28). As described above, the operating conditions include the operating period, the amount of fuel to be added, the temperature of the fluidized bed, and the amount of fluidized material to be replaced. The control device 70 operates the fluidized bed boiler 10 based on the determined operating conditions. For example, the control device 70 adds fuel based on the determined amount of fuel to be added. The control device 70 also maintains the temperature of the combustion chamber 21 at the determined temperature. Furthermore, the control device 70 continues operation until the determined operating period is reached.

[0035] As described above, the fluidized bed boiler 10 can suppress a decrease in heat transfer efficiency on the heat transfer surface and a decrease in fluidity of the fluidized bed by pre-calculating the relationship between the amount of alkali metals and chlorine in the fuel, the operating conditions, and the deposition rate, and controlling the operation based on the calculated relationship. This stabilizes the operating state of the combustion chamber 20 of the fluidized bed boiler 10, suppressing combustion failure due to temperature drops and a decrease in efficiency. Furthermore, the fluidized bed boiler 10 of this disclosure has a low sulfur content in the fuel, and compounds of alkali metals and chlorine are formed as deposits. Therefore, the occurrence of corrosion due to deposits is suppressed. In the fluidized bed boiler 10, the fluidized bed is an erosion environment, and deposition progresses when the deposition rate exceeds the erosion rate. Based on the relationship in Figure 5 above, the deposition rate is calculated, and by calculating the deposition rate based on the fuel components and supply amount and the temperature of the fluidized bed and controlling the operating conditions, the fluidized bed can be operated appropriately.

[0036] The control device 70 calculates the deposition rate based on the deposition amount information shown in Figure 5, the acquired fuel information, and the temperature of the fluidized bed. It then adjusts the fuel supply amount and suppresses the amount of KCl supplied to the fluidized bed so that the amount of deposits that accumulate during operation is below a threshold. This prevents poor heat transfer in the combustion chamber 21 during operation, which would cause a decrease in the temperature of the fluidized bed and an increase in the energy consumed by the heating device.

[0037] Furthermore, the control device 70 calculates the deposition rate based on the deposition amount information shown in Figure 5, the acquired fuel information, and the temperature of the fluidized bed, calculates the point at which the deposition amount exceeds the allowable value, and determines the operating period. In other words, it determines the timing for maintenance. This allows maintenance to be performed at the appropriate time.

[0038] Furthermore, if the control device 70 is equipped with a deposit removal mechanism, such as a water washing mechanism, it may calculate the deposit rate based on the deposit amount information in Figure 5, the acquired fuel information, and the temperature of the fluidized bed, and activate the removal mechanism when the deposit amount exceeds a certain level. In other words, the timing of the removal mechanism's operation may be set as an operating condition. Also, as in this embodiment, when KCl deposits, it becomes a water-soluble deposit, so it can be removed by water washing. In addition, as in this embodiment, in a mechanism that heats fuel with a low sulfur content (S), even if water is used for washing during operation, the acceleration of corrosion can be suppressed.

[0039] Furthermore, in the above embodiment, the operating conditions were set based on the relationship in Figure 5, but the operating conditions may also be controlled based on the fuel components and their adhesion to the fluidized material shown in Figures 6 and 7. The control device 70 evaluates the concentration of deposits adhering to the fluidized material in the fluidized material measuring unit 54, and sets the Cl concentration (amount of Cl / amount of fluidized material) in the fluidized material to less than 300 mg / kg, or the K concentration (amount of K / amount of fluidized material) to less than 750 mg / kg. By setting the components of the amount of fluidized material adhering to the fluidized material to satisfy the above conditions, the generation of agglomerate particles can be suppressed. This makes it possible to maintain fluidity within the fluidized bed.

[0040] Furthermore, the control device 70 controls the amount of fluidized bed fluid to be replaced, that is, the amount added to the fluidized bed and the amount discharged, based on the fuel components and adhesion to the fluidized bed shown in Figures 6 and 7, so that, for example, the Cl concentration (amount of Cl / amount of fluidized bed) in the fluidized bed is less than 300 mg / kg, or the K concentration (amount of K / amount of fluidized bed) is less than 750 mg / kg. By supplying fluidized bed fluid free of deposits or fluidized bed fluid from which deposits have been removed in the fluidized bed fluid circulation unit 40, the amount of chlorine and potassium deposits in the fluidized bed can be reduced, thereby suppressing the generation of agglomerate particles.

[0041] Furthermore, based on the fuel components and their adhesion to the fluidized material shown in Figures 6 and 7, the control device 70 suppresses the increase of deposits. For example, if the amount of deposits exceeds a threshold, it sets the temperature of the fluidized bed to 580°C or lower. This suppresses the generation of KCl, as shown in Figure 4, and thus suppresses the increase of deposits.

[0042] Furthermore, although the above embodiment was described using potassium as the alkali metal, the same applies to sodium (Na). The alkali metal can be evaluated by its total amount in the fuel.

[0043] This disclosure discloses the following inventions, but is not limited to those described below. (1) A fluidized bed operation control device for controlling a fluidized bed apparatus that heats a biomass-containing fuel while fluidizing it with a fluidizing agent, comprising: a measurement unit for acquiring the alkali metal content and chlorine content of the biomass-containing fuel; a temperature acquisition unit for acquiring the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing agent and the fuel flow; and a control unit for calculating the amount of deposits based on the alkali metal content and the temperature of the fluidized bed, and for controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

[0044] (2) The control unit has a relationship, calculated in advance, between the concentration of the alkali metal-chlorine reaction product in the fluidized bed, the temperature of the fluidized bed, and the rate of adhesion of the deposits. A fluidized bed operation control device according to (1), which calculates the amount of deposits based on the above relationship, the alkali metal content, and the temperature of the fluidized bed.

[0045] (3) The fluidized bed operation control device according to (1) or (2), wherein the control unit controls the amount of fuel to be added as an operating condition.

[0046] (4) The fluidized bed operation control device according to (3), wherein the control unit sets the chlorine concentration of the fluidized bed to less than 300 mg / kg or the alkali metal concentration to less than 750 mg / kg as the operating conditions.

[0047] (5) A fluidized bed operation control device according to any one of (1) to (4), wherein the control unit calculates the operating period of the fluidized bed apparatus as the operating conditions.

[0048] (6) A fluidized bed operation control device according to any one of (1) to (5), wherein the control unit controls the amount of fluid replacement in the fluidized bed as an operating condition.

[0049] (7) The control unit controls the temperature of the fluidized bed as an operating condition, according to any one of (1) to (6).

[0050] (8) The control unit is a fluidized bed operation control device according to any one of (1) to (7), wherein the temperature of the fluidized bed is 580°C or less as the operating condition.

[0051] (9) The fluidized bed operation control device according to any one of (1) to (8), wherein the alkali metal is potassium.

[0052] (10) A fluidized bed operation control method for controlling a fluidized bed apparatus that heats a biomass-containing fuel while fluidizing it with a fluidizing agent, comprising the steps of: obtaining the alkali metal content and chlorine content of the biomass-containing fuel; obtaining the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing agent and the fuel flow; calculating the amount of deposits based on the alkali metal content and the temperature of the fluidized bed, and controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

[0053] (11) A fluidized bed operation control program for controlling a fluidized bed apparatus that heats a biomass-containing fuel while fluidizing it with a fluidizing agent, the program causing a computer to perform the following steps: obtaining the alkali metal content and chlorine content of the biomass-containing fuel; obtaining the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing agent and the fuel flow; calculating the amount of deposits based on the alkali metal content and the temperature of the fluidized bed, and controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits. [Explanation of Symbols]

[0054] 10. Fluidized bed boiler 11 Cyclone 12 Discharge passage 13 Internal heat exchanger 14 Air preheater 15 Dust collector 16 Chimney 17 Air supply pipe 18 Air Fan 20 Fluidized bed furnace 21 Combustion chamber 212 Side wall 22 Bottom 23 Fluidized bed 23a Flow direction 30 Diffusion tube 30° air supply hole 32 Fluid supply section 34 Fuel supply section 36 Heating device 36a 1st heating section 36b 2nd heating section 40 Fluid circulation section 42 Circulation pathways 44 Separation part 46 Cleaning section 50 Temperature measurement section 52 Fuel measuring section 54 Flow material measurement section 70 Control device 72 Control Unit 74 Memory section

Claims

1. A fluidized bed operation control device for controlling a fluidized bed apparatus that heats a biomass-containing fuel while fluidizing it with a fluidizing agent, A measurement unit that acquires the alkali metal content and chlorine content of biomass-containing fuel, The fluidized bed apparatus includes a temperature acquisition unit that acquires the temperature of the fluidized bed in which the fluid material and the fuel flow, A fluidized bed operation control device comprising: a control unit that calculates the amount of deposits based on the alkali metal content, the chlorine content, and the temperature of the fluidized bed, and controls the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

2. The control unit has a pre-calculated relationship between the concentration of the alkali metal-chlorine reaction product in the fluidized bed, the temperature of the fluidized bed, and the rate of deposit adhesion. A fluidized bed operation control device according to claim 1, which calculates the amount of deposits based on the above relationship, the alkali metal content, and the temperature of the fluidized bed.

3. The fluidized bed operation control device according to claim 1, wherein the control unit controls the amount of fuel to be added as an operating condition.

4. The fluidized bed operation control device according to claim 3, wherein the control unit sets the operating conditions to a chlorine concentration of the fluidized bed to less than 300 mg / kg or an alkali metal concentration of less than 750 mg / kg.

5. The fluidized bed operation control device according to claim 1, wherein the control unit calculates the operating period of the fluidized bed apparatus as the operating conditions.

6. The fluidized bed operation control device according to claim 1, wherein the control unit controls the amount of fluid replacement in the fluidized bed as the operating condition.

7. The fluidized bed operation control device according to claim 1, wherein the control unit controls the temperature of the fluidized bed as the operating condition.

8. The fluidized bed operation control device according to claim 1, wherein the control unit sets the temperature of the fluidized bed to 580°C or less as the operating condition.

9. The fluidized bed operation control device according to claim 1, wherein the alkali metal is potassium.

10. A fluidized bed operation control method for controlling a fluidized bed apparatus that heats a biomass-containing fuel while fluidizing it with a fluidizing agent, A step to obtain the alkali metal content and chlorine content of a biomass-containing fuel, The steps include obtaining the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing material and the fuel flow, A method for operating a fluidized bed, comprising the steps of: calculating the amount of deposits based on the alkali metal content, the chlorine content, and the temperature of the fluidized bed; and controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

11. A fluidized bed operation control program for a fluidized bed apparatus that heats a biomass-containing fuel while fluidizing it with a fluidizing agent, A step to obtain the alkali metal content and chlorine content of a biomass-containing fuel, The steps include obtaining the temperature of the fluidized bed in the fluidized bed apparatus in which the fluidizing material and the fuel flow, A fluidized bed operation control program that causes a computer to perform a process including the steps of: calculating the amount of deposits based on the alkali metal content, the chlorine content, and the temperature of the fluidized bed; and controlling the operating conditions of the fluidized bed apparatus based on the calculated amount of deposits.

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