JP2008261524A - Fuel supply device and fuel supply method of fluidized bed boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device of a fluidized bed boiler capable of quickly uniformize temperature distribution in a fluidized bed boiler, when fuel supply from a certain fuel nozzle is stopped. <P>SOLUTION: This fuel supply device comprises a control device 15 for controlling fuel supply amounts from a plurality of fuel nozzles 111-11a, and the control device 15 has a control table 153 storing controlled variable to control the fuel supply amounts from the other fuel nozzles 111-11a to uniformize the temperature distribution in a pressure fluidized bed boiler 2, when the fuel supply from a certain fuel nozzle 111-11a is stopped. The fuel supply amounts from the other fuel nozzles 111-11a are controlled on the basis of the control table 153, when the fuel supply from a certain fuel nozzle 111-11a is stopped. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel supply apparatus and a fuel supply method for a fluidized bed boiler that supplies fuel to a fluidized bed boiler from a plurality of fuel nozzles.

A fluidized bed (fluidized bed) boiler is a boiler that blows air from below to float (flow) fuel and fluidized medium (bed material), and burns the fuel in the suspended state. In a pressurized fluidized bed combined power generation (PFBC) using such a fluidized bed boiler, a mixture of coal, limestone and water (CWP: Coal Water Paste) or the like is used as fuel. This fuel is sent by a fuel pump to a plurality of fuel nozzles disposed in the fluidized bed boiler, injected from the fuel nozzle, and burned in the fluidized bed boiler (see, for example, Patent Document 1). The plurality of fuel nozzles are arranged so that the combustion temperature in the fluidized bed boiler is uniform.
JP 05-288334 A

  By the way, when a certain fuel pump trips (emergency stop) or the like, the fuel supply (fuel injection) from the fuel nozzle of the fuel pump stops and flow obstruction occurs. That is, the temperature around the fuel nozzle that has been stopped in supply decreases, and a temperature deviation occurs in the fluidized bed boiler. Furthermore, since the fuel supply from the fuel nozzle is stopped, the amount of fuel supplied into the fluidized bed boiler is reduced. For this reason, while confirming the temperature distribution on the monitor that monitors the temperature distribution in the fluidized bed boiler, the temperature distribution in the fluidized bed boiler becomes uniform, and the supply amount from the stopped fuel nozzle is compensated. It is necessary to adjust the fuel supply amount (bias correction amount) from the fuel nozzles other than the stopped fuel nozzles. However, the temperature deviation in the fluidized bed boiler differs depending on the position of the fuel nozzle that has stopped supplying. For this reason, it is necessary to adjust the fuel supply amounts of the plurality of fuel nozzles each time according to the arrangement position of the stopped fuel nozzles, temperature deviation, and the like. As a result, much time and labor are required to make the temperature distribution uniform.

  Therefore, the present invention provides a fluidized bed boiler fuel supply device and a fuel supply method capable of quickly equalizing the temperature distribution in a fluidized bed boiler when the fuel supply from a certain fuel nozzle is stopped. With the goal.

In order to achieve the above object, the invention according to claim 1 is a fuel supply apparatus for a fluidized bed boiler that supplies fuel to a fluidized bed boiler from a plurality of fuel nozzles, and controls the amount of fuel supplied from the fuel nozzles. And when the fuel supply from a certain fuel nozzle stops, the control means controls the fuel supply amount from the other fuel nozzles so that the temperature distribution in the fluidized bed boiler becomes uniform. A control table storing power control amounts is provided, and when the fuel supply from a certain fuel nozzle is stopped, the fuel supply amounts from other fuel nozzles are controlled based on the control table.
(Function)
When the fuel supply from one fuel nozzle is stopped, the control means controls the fuel supply amount from the other fuel nozzles based on the control table, and the temperature distribution in the fluidized bed boiler becomes uniform (temperature). Deviation is smaller).

According to a second aspect of the present invention, in the fuel supply apparatus according to the first aspect, when the fuel supply from the fuel nozzles in the past is stopped, the temperature distribution in the fluidized bed boiler is indicated in the control table. A control amount in which the fuel supply amount from other fuel nozzles is controlled to be uniform is stored.
(Function)
When the fuel supply from one fuel nozzle is stopped, the control means controls the fuel supply amount from the other fuel nozzles based on the control table storing the past control amount, and the temperature distribution in the fluidized bed boiler is uniform. Will come to be.

According to a third aspect of the present invention, in the fuel supply device according to any one of the first or second aspects, a control amount by the control means is fed back to the control table.
(Function)
When the fuel supply from a certain fuel nozzle is stopped and the control by the control means is performed, the control amount is fed back to the control table. In the next control (when the fuel supply is stopped), the fuel supply amount from the other fuel nozzles is controlled based on the feedback control table.

According to a fourth aspect of the present invention, in the fuel supply device according to any one of the first to third aspects, the control means supplements the other fuel supply amount from the fuel nozzle that has stopped the supply. The fuel supply amount from the fuel nozzle is controlled.
(Function)
When the fuel supply from a certain fuel nozzle stops, the control means controls the fuel supply amount from other fuel nozzles based on the control table, and the temperature distribution in the fluidized bed boiler becomes uniform, The fuel supply amount from the stopped fuel nozzle is supplemented, and the entire fuel supply amount is maintained.

  The invention according to claim 5 is a fuel supply method of a fluidized bed boiler for supplying fuel to a fluidized bed boiler from a plurality of fuel nozzles, and when the fuel supply from a certain fuel nozzle is stopped, the fluidized bed boiler is provided. The control amount for controlling the fuel supply amount from other fuel nozzles is stored in advance as a control table so that the temperature distribution in the inside is uniform, and when the fuel supply from a certain fuel nozzle stops, Based on this, the fuel supply amount from another fuel nozzle is controlled.

  According to a sixth aspect of the present invention, in the fuel supply method according to the fifth aspect, when the fuel supply from the fuel nozzles in the past is stopped in the control table, the temperature distribution in the fluidized bed boiler is uniform. The control amount that controls the fuel supply amount from the other fuel nozzles is stored.

  A seventh aspect of the invention is characterized in that, in the fuel supply method according to any one of the fifth and sixth aspects, a control amount performed based on the control table is fed back to the control table.

  According to the first and fifth aspects of the present invention, the fuel supply amount from the other fuel nozzles is based on the control table storing the control amount to be controlled so that the temperature distribution in the fluidized bed boiler is uniform. Is controlled. For this reason, the temperature distribution in the fluidized bed boiler can be quickly and easily compared with the case where the fuel supply amount of a plurality of other fuel nozzles is controlled (adjusted) each time depending on the arrangement position of the stopped fuel nozzle. It becomes possible to equalize appropriately.

  According to the second and sixth aspects of the invention, the fuel supply amount from the other fuel nozzles is controlled based on the control table in which the control amounts controlled in the past are stored. In other words, since the temperature distribution in the fluidized bed boiler is controlled based on the control amount that is actually controlled so that the temperature distribution in the fluidized bed boiler becomes uniform, the temperature distribution in the fluidized bed boiler can be made uniform more quickly, easily and appropriately. It becomes.

  According to the third and seventh aspects of the present invention, since the fuel supply amount from the other fuel nozzles is controlled based on the control table in which the actual control amount is fed back, based on the more appropriate control table. The temperature distribution in the fluidized bed boiler can be made uniform more quickly, easily and appropriately.

  According to the fourth aspect of the present invention, since the fuel supply amount from the stopped fuel nozzle is supplemented and the entire fuel supply amount is maintained, even if the fuel supply from a certain fuel nozzle stops, The amount of combustion in the bed boiler can be maintained.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a schematic diagram showing a pressurized fluidized bed combined power generation facility equipped with a fluidized bed boiler fuel supply device (hereinafter simply referred to as a “fuel supply device”) 1 according to this embodiment. Reference numeral 2 in the figure is a pressurized fluidized bed boiler (fluidized bed boiler), which is a boiler that supplies combustion air from the lower side to float the fuel and the fluidized medium and burns the suspended fuel under pressure, In this embodiment, as will be described later, a mixture of coal M1, limestone M2, and water M3 is supplied as fuel M. A heat transfer tube 21 is disposed in the pressurized fluidized bed boiler 2, water is supplied to the heat transfer tube 21 to generate steam, and the steam is sent to the steam turbine 3 to drive the steam turbine 3. On the other hand, the combustion gas discharged from the pressurized fluidized bed boiler 2 collects ash by a dust collector (cyclone) 4, and the deashed (dedusted) combustion gas is sent to the gas turbine 5, where the gas turbine 5 To drive. Each generator 6 generates electric power by rotational driving of the steam turbine 3 and the gas turbine 5.

  The fuel supply device 1 is a device that supplies the fuel M to the pressurized fluidized bed boiler 2 as described above. As shown in FIG. 2, the fuel nozzle group 11, the fuel pump group 12, the thermometer group 13, , A monitor 14 and a control device (control means) 15.

  The fuel nozzle group 11 is composed of ten fuel nozzles 111 to 11a in this embodiment, and the tip (injection side) is located below the pressurized fluidized bed boiler 2 as shown in FIG. The base end (fuel pump group 12 side) is disposed outside the pressurized fluidized bed boiler 2. Further, the left and right five fuel nozzles 111 to 11a are arranged on the same horizontal plane with the axial surface of the pressurized fluidized bed boiler 2 (a surface parallel to the central axis and on the central axis) as a contrast.

  The fuel pump group 12 is a pump group for supplying the fuel M to the fuel nozzle group 11, and is composed of ten fuel pumps 121 to 12a corresponding to the fuel nozzles 111 to 11a. The suction ports of the fuel pumps 121 to 12 a are connected to the fuel tank 7, and the fuel M is fed into the fuel tank 7 from the kneader 8. When coal M1, limestone M2, and water M3 are charged into the kneading machine 8, the kneading machine 8 generates fuel M, which is CWP. Subsequently, the generated fuel M is introduced into the fuel tank 7, and the fuel M sucked by the fuel pumps 121 to 12a is injected into the pressurized fluidized bed boiler 2 from the fuel nozzles 111 to 11a. is there.

  The thermometer group 13 measures the temperature in the pressurized fluidized bed boiler 2 and its distribution (deviation), and is composed of 11 thermocouples 131 to 13b in this embodiment. These thermocouples 131 to 13b are arranged as shown in FIG. 4 so that the temperature distribution in the pressurized fluidized bed boiler 2 can be measured appropriately. That is, eight thermocouples 131 to 138 are disposed between the fuel nozzles 111 to 11a adjacent to each other on the fuel nozzles 111 to 11a side, and further, the fuel nozzles 111 to 115 are disposed at the center in the pressurized fluidized bed boiler 2. In parallel, three thermocouples 139 to 13b are arranged at equal intervals. Moreover, the measurement results (thermoelectromotive force) by these thermocouples 131 to 13b are sent to the control device 15 so that the temperature distribution in the pressurized fluidized bed boiler 2 is displayed on the monitor 14 as described later. It has become. As described above, in this embodiment, the temperature distribution is displayed on the monitor 14 via the control device 15, but the measurement result by the thermometer group 13 is directly monitored 14 not via the control device 15. May be displayed.

  The monitor 14 is a display device that displays the measurement result obtained by the thermometer group 13. That is, when the measurement results from the thermocouples 131 to 13b are sent to the control device 15, the control device 15 converts the measurement results into temperatures, and the converted temperatures are sent to the monitor 14. And in the monitor 14, as shown in FIG. 5, the temperature distribution in the pressurized fluidized bed boiler 2 is displayed by displaying the temperature of the measurement area of each thermocouple 131-13b on a display.

  The control device 15 is a device that controls the fuel supply amount (fuel injection amount) from each fuel nozzle 111 to 11a, that is, a device that controls the discharge amount from each fuel pump 121 to 12a. As illustrated in FIG. 6, the control device 15 includes a manual control unit 151 and an automatic control unit 152.

  The manual control unit 151 is used by an operator or the like to manually control the fuel supply amount, and includes an adjustment handle corresponding to each of the fuel nozzles 111 to 11a. Based on the operation direction and the operation amount of the adjustment handle, the fuel supply amount from each fuel nozzle 111 to 11a, that is, the discharge amount from each fuel pump 121 to 12a is adjusted. Further, when adjustment and control are performed by the manual control unit 151 after the automatic control unit 152 is started as described later, the control amount (adjustment amount) is fed back to the control table 153 described later. Yes. In other words, each control amount in the control table 153 is adjusted based on the control amount by the manual control unit 151, and the control table 153 is updated.

  The automatic control unit 152 automatically controls the fuel supply amount from the other fuel nozzles 111 to 11a when the fuel supply from a certain fuel nozzle 111 to 11a is stopped. That is, when a signal that a certain fuel pump 121 to 12a has tripped is received from the fuel pumps 121 to 12a or from a detector that detects the stop of each of the fuel pumps 121 to 12a. Based on the control table 153, the amount of discharge from the other fuel pumps 121 to 12a that have not tripped is controlled.

  Specifically, first, the fuel supply amounts from the other fuel nozzles 111 to 11a are controlled so as to supplement the fuel supply amounts from the fuel nozzles 111 to 11a whose supply has been stopped. For example, if the total fuel supply amount from 10 fuel nozzles 111 to 11a is 45 tons / hour, when the fuel supply from a certain fuel nozzle 111 to 11a is stopped, the fuel supply is 4.5 tons / hour. The amount will be lost. For this reason, the fuel supply amount from the other nine fuel nozzles 111 to 11a is increased by 0.5 ton / hour (= 4.5 / 9). Thereby, the total fuel supply amount from the fuel nozzle group 11 does not fluctuate.

  Further, based on the control table 153, the temperature distribution in the pressurized fluidized bed boiler 2 is controlled to be uniform. That is, when the fuel supply from one fuel nozzle 111 to 11a is stopped, the fuel supply amount from the other fuel nozzles 111 to 11a should be controlled so that the temperature distribution in the pressurized fluidized bed boiler 2 becomes uniform. The control amount is stored in the control table 153. Specifically, when the fuel supply from the fuel nozzles 111 to 11a in the past is stopped, the fuel supply from the other fuel nozzles 111 to 11a is made so that the temperature distribution in the pressurized fluidized bed boiler 2 becomes uniform. The average value of the control amount that controls the amount is stored. That is, past control results are stored in the control table 153.

  Here, the case where the total fuel supply amount from the fuel nozzles 111 to 11a is 45 tons / hour as described above will be described as an example. For example, when the fuel supply from the first nozzle 111 is stopped, the control amount (deviation amount) for controlling the fuel supply amount from the other fuel nozzles 112 to 11a is as shown in FIG. It is remembered. A value obtained by adding the above-mentioned increment of 0.5 ton / hour to each control amount in the control table 153 is a fluctuation amount of the fuel supply amount from the other fuel nozzles 112 to 11a. For example, since the control amount of the second nozzle 112 is +1.9 tons / hour, the fluctuation amount of the fuel supply amount from the second nozzle 112 is +2.4 tons / hour. Then, the discharge amount from the second fuel pump 122 is controlled so that the fuel supply amount from the second nozzle 112 increases by 2.4 tons / hour.

  Similarly, when the fuel supply from the second to fifth nozzles 112 to 115 is stopped, the other fuel nozzles 111 to 11a are controlled based on the control table 153 as shown in FIGS. Control the amount of fuel supply. In addition, when the fuel supply from the sixth nozzle 116 is stopped, the control table 153 when the fuel supply from the fifth nozzle 115 symmetrical to the sixth nozzle 116 is stopped (FIG. 7E). )) Is controlled based on the control table 153 rotated 180 °. Similarly, when the fuel supply from the seventh to tenth nozzles 117 to 11 a is stopped, the control is performed based on the following control table 153.

Seventh nozzle 117: Control table obtained by rotating control table 153 in FIG. 7D by 180 ° Eighth nozzle 118: Control table obtained by rotating control table 153 in FIG. 7C by 180 ° Ninth nozzle 119: Control table obtained by rotating the control table 153 of FIG. 7B by 180 ° Tenth nozzle 11a: Control table obtained by rotating the control table 153 of FIG. 7A by 180 ° Here, in the control table 153 Each control amount is based on the following viewpoint. That is, since the fuel M is not supplied to the periphery of the stopped fuel nozzles 111 to 11a, the temperature of the periphery decreases. For this reason, the amount of fuel supplied from the other fuel nozzles 111 to 11a around the stopped fuel nozzles 111 to 11a is increased, and from the other fuel nozzles 111 to 11a located far from the stopped fuel nozzles 111 to 11a. Reduce fuel supply. Thereby, the temperature distribution in the pressurized fluidized bed boiler 2 is made uniform (temperature deviation is reduced). In addition, each control amount in the control table 153 is set to be zero by adding all. In other words, the total fuel supply amount is maintained when the sum of the deviation amounts as control amounts becomes zero.

  Further, as described above, when the fuel supply amount is controlled by the manual control unit 151, each control amount in the control table 153 is increased or decreased based on the control amount. That is, the temperature distribution in the pressurized fluidized bed boiler 2 may not be uniform only by the control by the automatic control unit 152. In such a case, the fuel supply amount is controlled (finely adjusted) by the manual control unit 151. The accuracy of the control table 153 can be improved by feeding back the control amount by the manual control unit 151 to each control amount in the control table 153.

  Next, the operation of the fuel supply apparatus 1 having such a configuration and a fuel supply method by the fuel supply apparatus 1 will be described.

  First, when a certain fuel pump 121 to 12a trips and fuel supply from the corresponding fuel nozzles 111 to 11a stops, the automatic control unit 152 is started as described above. Then, an increase in the fuel supply amount from the other fuel nozzles 111 to 11a is calculated so as to supplement the fuel supply amount from the stopped fuel nozzles 111 to 11a. Next, as described above, the increment is added to each control amount in the corresponding control table 153, and the fluctuation amount of the fuel supply amount from the other fuel nozzles 111 to 11a is calculated. And the discharge amount (operation amount) from the other fuel pumps 121 to 12a is controlled so that the discharge amount from the other fuel pumps 121 to 12a increases or decreases by this fluctuation amount. Subsequently, after such automatic control, when control (fine adjustment) is performed by the manual control unit 151 in order to make the temperature distribution in the pressurized fluidized bed boiler 2 more uniform, the control is performed as described above. The amount is fed back to the control table 153 and the control table 153 is updated. When the fuel supply from the same fuel nozzles 111 to 11a is stopped again, automatic control is performed based on the updated control table 153.

  As described above, according to the fuel supply device 1 and the fuel supply method, based on the control table 153 in which the control amount to be controlled so that the temperature distribution in the pressurized fluidized bed boiler 2 is uniform is stored. The amount of fuel supplied from the other fuel nozzles 111 to 11a whose supply is not stopped is automatically controlled. For this reason, in the pressurized fluidized bed boiler 2, compared with the case where the fuel supply amount of the plurality of other fuel nozzles 111 to 11a is manually adjusted in accordance with the arrangement position of the stopped fuel nozzles 111 to 11a. The temperature distribution can be made uniform quickly, easily and appropriately.

  Moreover, the fuel supply amounts from the other fuel nozzles 111 to 11a are controlled based on the control table 153 in which the control amounts controlled in the past are stored. That is, it is controlled based on the control amount actually controlled so that the temperature distribution in the pressurized fluidized bed boiler 2 becomes uniform. Further, the fuel supply amount is controlled based on a control table 153 to which a control amount finely adjusted manually is fed back. Therefore, based on the more appropriate control table 153, the temperature distribution in the pressurized fluidized bed boiler 2 can be made uniform more quickly, easily and with high accuracy. Further, since the entire fuel supply amount is maintained as described above, the combustion amount in the pressurized fluidized bed boiler 2 can be maintained even when the fuel supply from certain fuel nozzles 111 to 11a is stopped. . That is, the power generation amount can be maintained.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the case where the fuel pumps 121 to 12a are tripped as a cause of stopping the fuel supply from the fuel nozzles 111 to 11a has been described, but other causes, for example, the fuel nozzles 111 to 11a are described. It is also possible to automatically control by detecting clogging. Furthermore, when the temperature distribution in the pressurized fluidized bed boiler 2 greatly fluctuates, it is determined that the fuel supply from a certain fuel nozzle 111 to 11a has stopped, and is automatically controlled based on the determined fuel nozzle 111 to 11a. You may do it.

  In the above embodiment, the control amount based on the past performance is stored in the control table 153. However, the control amount based on the experiment result or the simulation result is stored in the control table 153 and controlled. Also good. Furthermore, even when the fuel supply from the plurality of fuel nozzles 111 to 11a is stopped, the temperature distribution in the pressurized fluidized bed boiler 2 can be made uniform quickly and appropriately by creating the control table 153 according to the case. Can be realized. Moreover, although the fuel supply apparatus and the fuel supply method of the pressurized fluidized bed boiler 2 in the pressurized fluidized bed combined power generation have been described, it is needless to say that the invention can be applied to other fluidized bed boilers.

It is a schematic diagram which shows the pressurized fluidized bed combined power generation equipment provided with the fuel supply apparatus of the fluidized bed boiler which concerns on embodiment of this invention. It is a figure which shows schematic structure of the fuel supply apparatus of FIG. It is a perspective view which shows the positional relationship of each fuel nozzle and pressurized fluidized bed boiler of the fuel supply apparatus of FIG. It is a top view which shows the positional relationship of each fuel nozzle of each fuel supply apparatus of FIG. 2, each thermocouple, and a pressurized fluidized bed boiler. It is a figure which shows an example of the temperature distribution in a pressurized fluidized bed boiler displayed on the monitor of the fuel supply apparatus of FIG. It is a schematic block diagram of the control apparatus of the fuel supply apparatus of FIG. It is a figure which shows an example of the control table of the control apparatus of FIG. 6, (a) is a control table in case the 1st nozzle trips, (b) is a control table in case the 2nd nozzle trips, (c) ) Is a control table when the third nozzle is tripped, (d) is a control table when the fourth nozzle is tripped, and (e) is a control table when the fifth nozzle is tripped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus of a fluidized bed boiler 11 Fuel nozzle group 111-11a Fuel nozzle 12 Fuel pump group 121-12a Fuel pump 13 Thermometer group 131-13b Thermocouple 14 Monitor 15 Control apparatus (control means)
151 Manual control unit 152 Automatic control unit 153 Control table 2 Pressurized fluidized bed boiler (fluidized bed boiler)
3 Steam Turbine 4 Dust Collector 5 Gas Turbine 6 Generator 7 Fuel Tank 8 Kneading Machine M Fuel M1 Coal M2 Limestone M3 Water

Claims (7)

A fluidized bed boiler fuel supply device for supplying fuel to a fluidized bed boiler from a plurality of fuel nozzles,
Comprising control means for controlling the amount of fuel supplied from the fuel nozzle;
The control means includes
When a fuel supply from a certain fuel nozzle is stopped, a control table storing a control amount for controlling a fuel supply amount from another fuel nozzle so that a temperature distribution in the fluidized bed boiler becomes uniform is provided. ,
When the fuel supply from a certain fuel nozzle stops, the fuel supply amount from another fuel nozzle is controlled based on the said control table, The fuel supply apparatus of the fluidized bed boiler characterized by the above-mentioned.   In the control table, when the fuel supply from the fuel nozzles in the past is stopped, the control amount that controls the fuel supply amount from the other fuel nozzles so that the temperature distribution in the fluidized bed boiler becomes uniform. The fluid supply device for a fluidized bed boiler according to claim 1, wherein the fuel supply device is stored.   The fuel supply device for a fluidized bed boiler according to claim 1 or 2, wherein a control amount by the control means is fed back to the control table.   The said control means controls the fuel supply amount from the said other fuel nozzle so that the fuel supply amount from the said fuel nozzle which stopped supply may be supplemented. Fuel bed boiler fuel supply device. A fluidized bed boiler fuel supply method for supplying fuel to a fluidized bed boiler from a plurality of fuel nozzles,
When the fuel supply from a certain fuel nozzle is stopped, the control amount for controlling the fuel supply amount from the other fuel nozzle is stored in advance as a control table so that the temperature distribution in the fluidized bed boiler becomes uniform.
A fuel supply method for a fluidized bed boiler, wherein when a fuel supply from a fuel nozzle is stopped, a fuel supply amount from another fuel nozzle is controlled based on the control table.   In the control table, when the fuel supply from the fuel nozzle in the past is stopped, the control amount for controlling the fuel supply amount from the other fuel nozzles is stored so that the temperature distribution in the fluidized bed boiler becomes uniform. The fuel supply method for a fluidized bed boiler according to claim 5. The fuel supply method for a fluidized bed boiler according to any one of claims 5 and 6, wherein a control amount performed based on the control table is fed back to the control table.

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