JPH1144410A - Pressurized fluidized-bed composite generating system and method and apparatus for controlling it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a fuel amount even according to a layer temperature with relativeness between a system for operating the fuel amount based on steam temperature and a system for operating a layer height based on the layer temperature. SOLUTION: The method for controlling a pressurized fluidized-bed composite generating system comprises the steps of generating a fuel amount target value 108 based on a fuel amount set value 106 generated from a functional generator 74, generating a fuel amount command value 110 according to the value 108, operating a coal charging amount in a fuel supply line according to the value 110, and correcting the operating amount according to an output from a controller 72 so that a deviation of the actual steam temperature from the set value becomes zero. Further, the method comprises the steps of correcting a layer height set value generated from a functional generator 96 in response to a deviation of the actual layer temperature from a set value by an adder 94, and operating the layer height based on the corrected layer height command value 116. And, the method also comprises the steps of outputting a signal responsive to a deviation of the actual layer temperature from the set value from a controller 86 to an adder 78 in response to a switching signal 113 from a condition deciding unit 90 to correct the value 110.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized fluidized bed combined cycle power generation system, and more particularly to a steam turbine driven by steam generated from a pressurized fluidized bed boiler and a gas turbine driven by combustion exhaust gas. TECHNICAL FIELD The present invention relates to a pressurized fluidized-bed combined power generation system suitable for performing power generation by a generator connected to a power generator, a control method thereof, and a control device.

[0002]

2. Description of the Related Art As one of power generation systems using coal as fuel, a pressurized fluidized bed combined power generation system is known. In this system, a steam turbine is driven by steam generated from a pressurized fluidized bed boiler that burns coal in a fluidized bed under a pressurized atmosphere, and a gas turbine is driven by combustion exhaust gas generated from a pressurized fluidized bed boiler. Then, power is generated by a generator connected to each turbine.

In a furnace of a pressurized fluidized-bed boiler, a fluidized bed containing fuel, air, and fluidized medium particles (Bed Material) is formed. By burning the fuel in the fluidized bed, the fluidized bed is heated. The heat transfer tube can be heated to generate steam from the heat transfer tube, and a high-temperature, high-pressure combustion exhaust gas can be exhausted from the furnace as a gas accompanying the combustion.

[0004] In the process of driving the steam turbine by the steam generated from the pressurized fluidized bed boiler and driving the gas turbine by the combustion exhaust gas, there is a demand for increasing the power generated by the generator connected to each turbine. When increasing the load of a pressurized fluidized bed boiler, it is necessary to increase the bed height of the fluidized bed by increasing the bed height of the fluidized bed and increase the contact area between the fluidized bed and the heat transfer tube to increase the amount of heat transfer. Done. On the other hand, when reducing the load of the pressurized fluidized bed boiler, the fluidized medium particles forming the fluidized bed are extracted from the furnace to the outside of the furnace to lower the bed height of the fluidized bed, and the contact area between the fluidized bed and the heat transfer tube is reduced. The heat transfer amount is reduced by making it smaller.

[0005] The temperature of the steam for driving the steam turbine is determined by the temperature of the fluidized bed and the heat transfer area by the bed height of the fluidized bed. In order to drive the steam turbine in a normal state, it is necessary to control the steam temperature within a temperature range of about 20 ° C. The bed temperature of the fluidized bed that determines the steam temperature also needs to be controlled within a temperature range of about 800 to 900 ° C. for reasons such as maintaining the combustion rate of coal and preventing poor flow due to melting of ash. The manipulated variables for controlling these two temperatures include the fuel supply rate and the bed height. That is, if the bed height in the fluidized bed is increased, the heat transfer area between the fluidized bed and the heat transfer tubes increases, and the bed temperature rises. Conversely, when the bed height is reduced, the heat transfer area between the fluidized bed and the heat transfer tubes decreases, and the bed temperature increases. On the other hand, when the fuel supply amount is increased, the bed temperature rises, and accordingly, the steam temperature also rises. Conversely, when the fuel supply is reduced, both the bed temperature and the steam temperature decrease.

As described above, in the pressurized fluidized-bed combined power generation system, since there are two operation amounts for the two temperatures of the bed temperature and the steam temperature, when controlling the system, each operation amount is set to one of the two operation amounts. The control method of adjusting based on the temperature deviation signal is adopted. For example, Japanese Patent Application Laid-Open No. Sho 56-64208 discloses a method for controlling the bed temperature by the bed height.
Publication.

[0007] The bed temperature is controlled by the bed height (operating the bed height so that the bed temperature becomes a set value), and the steam temperature is controlled by the fuel amount (the fuel amount is operated so that the steam temperature becomes the set value). The method has the following advantages. In other words, the steam temperature has a smaller allowable temperature range than the bed temperature, and requires more delicate control. At this time, the fuel supply amount can be finely adjusted and the response of the steam temperature is quicker than the bed height operation in which the fluid medium particles are moved by a method such as airflow conveyance. For this reason, it becomes easy and accurate to maintain the steam temperature at the target temperature in the temperature control or the like during the constant load operation.

[0008]

In the prior art, a system for operating a fuel amount in accordance with a load command and operating a fuel amount so as to maintain a steam temperature at a set temperature, and a system for operating a bed temperature at a set temperature are provided. Since the systems that operate the bed height are composed of independent systems, and there is no system that relates them to each other, the bed height of the fluidized bed changes according to the operation request to change the load on the generator. In this case, the bed temperature and the steam temperature may be out of the allowable range.

Specifically, when the bed height is increased in response to a load increase command, the low temperature (20 ° C. to 200 ° C.) stored in an external tank is stored in a high temperature (about 860 ° C.) fluidized bed in the furnace.
C.), and the bed temperature of the fluidized bed drops sharply and drastically. When the bed temperature decreases, the amount of heat transferred to the heat transfer tubes decreases, and the steam temperature also sharply decreases. And when the bed temperature falls, the control to raise the bed height is temporarily stopped,
When the bed temperature rises again, an operation of increasing the bed height is performed. In the process of repeating such an operation, the steam temperature decreases as the bed height increases, and falls below the allowable range. That is, since the steam temperature is affected by the operation of the fuel amount and the bed height via the bed temperature, the steam temperature is also affected by the bed temperature change due to the bed height. Then, when the steam temperature falls below the allowable range, an operation of increasing the fuel amount is performed to eliminate the decrease in the steam temperature, and the steam temperature sequentially increases toward the target value. However, when the fuel amount increases, the combustion energy increases with the rapid increase in the fuel amount, and the bed temperature sharply increases. At this time, even if the layer temperature is controlled by the layer height, the layer height cannot be increased beyond a certain height, and the layer temperature cannot be controlled by the layer height. If the operation to increase the fuel amount is continued even when the bed height reaches the maximum height, the bed temperature is not controlled by the bed height,
The temperature rises with an increase in combustion energy, and the temperature exceeds an allowable range.

When the bed height is lowered in response to a request for lowering the load, when the fuel supply amount does not change, the bed temperature rises but the rising speed is slow and the change width is small. The steam temperature does not fall outside the allowable range.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressurized fluidized-bed combined power generation system in which a system for operating a fuel amount and a system for operating a bed height are related to each other so that the fuel amount can be operated also by a bed temperature. An object of the present invention is to provide a system, a control method thereof, and a control device.

[0012]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a furnace contained in a pressure vessel and a layer containing fuel, air and fluidized medium particles contained in the furnace. A fluidized bed, a heat transfer tube that is housed in a furnace and receives water from outside the pressure vessel to generate steam by the heat of the fluidized bed, a steam turbine that converts the energy from the steam from the heat transfer tube into rotational energy, and a steam. A steam turbine generator that is rotationally driven by a turbine, a gas turbine that receives exhaust gas accompanying the combustion of fuel in a fluidized bed from a furnace, and converts the energy of the exhaust gas into rotational energy, and is rotationally driven by the gas turbine. Gas turbine generator, steam temperature detecting means for detecting temperature of steam generated from heat transfer tube, bed temperature detecting means for detecting temperature of fluidized bed in furnace, furnace Bed height detecting means for detecting the height of the fluidized bed, fuel supply amount operating means for controlling the amount of fuel supplied to the furnace based on the load command and the detection value of the steam temperature detecting means, and bed temperature detecting means Height operation means for operating the height of the fluidized bed in the furnace based on the detected value of the bed height detection means and the operation amount of the fuel supply amount operation means based on the detection value of the bed temperature detection means. This constitutes a pressurized fluidized-bed combined power generation system including an operation amount correction unit for correcting the operation amount.

When configuring the pressurized fluidized-bed combined power generation system, the correction means for correcting the operation amount can be configured with the following elements.

(1) On the condition that the power generated by at least one of the generator for the steam turbine and the generator for the gas turbine has changed, the fuel supply amount operating means is controlled based on the detection value of the bed temperature detecting means. Correct the operation amount.

(2) The operation amount of the fuel supply amount operation means is corrected according to the difference between the detection value of the bed temperature detection means and the set value.

Further, according to the present invention, as a system control method, steam generated from a pressurized fluidized-bed boiler is supplied to a steam turbine, and a steam turbine generator is driven by the steam turbine. The combustion flue gas generated is sent to the gas turbine, and the gas turbine drives the generator for the gas turbine. The gas is supplied to the pressurized fluidized bed boiler based on the temperature of steam generated from the pressurized fluidized bed boiler and the load command. Operating the height of the fluidized bed in the pressurized fluidized bed boiler based on the temperature of the fluidized bed in the pressurized fluidized bed boiler. A control method of a combined pressurized fluidized-bed power generation system is characterized in that an operation amount for operation is corrected based on a temperature of a fluidized bed in a pressurized fluidized-bed boiler.

Further, according to the present invention, as a control device of a system, a steam generated from a pressurized fluidized bed boiler is supplied to a steam turbine, and a steam turbine generator is driven by the steam turbine. The combustion flue gas generated is sent to the gas turbine, and the gas turbine drives the generator for the gas turbine. The gas is supplied to the pressurized fluidized bed boiler based on the temperature of steam generated from the pressurized fluidized bed boiler and the load command. The amount of fuel to be supplied, the height of the fluidized bed in the pressurized fluidized bed boiler based on the temperature of the fluidized bed in the pressurized fluidized bed boiler, and the amount of fuel supplied to the pressurized fluidized bed boiler The control device of the combined pressurized fluidized bed power generation system is characterized in that an operation amount for performing the operation is corrected based on the temperature of the fluidized bed in the pressurized fluidized bed boiler.

In configuring the control method and the control device of the pressurized fluidized-bed combined power generation system, they can be configured with the following elements.

(1) An operation for controlling the amount of fuel supplied to the pressurized fluidized-bed boiler on condition that the power generated by at least one of the generator for the steam turbine and the generator for the gas turbine has changed. The application is corrected based on the temperature of the fluidized bed in the pressurized fluidized bed boiler.

(2) The operation amount for controlling the amount of fuel supplied to the pressurized fluidized bed boiler is corrected according to the deviation between the temperature of the fluidized bed in the pressurized fluidized bed boiler and a set value.

(3) An operation for controlling the amount of fuel supplied to the pressurized fluidized-bed boiler on condition that the power generated by at least one of the generator for the steam turbine and the generator for the gas turbine has changed. The amount is corrected according to the deviation between the temperature of the fluidized bed in the pressurized fluidized bed boiler and the set value.

According to the above-mentioned means, a system for operating the fuel amount in accordance with the load command and operating the fuel amount so as to maintain the steam temperature at the set value and a bed height so as to maintain the bed temperature at the set value are provided. Has a relationship with the system that operates
Since the fuel amount is also controlled by the bed temperature, the bed temperature and the steam temperature can be controlled in a coordinated manner. Furthermore, even if it becomes difficult to control the bed temperature by controlling the bed height, the fuel amount is controlled by the bed temperature, so the bed temperature set value (target value)
, And the steam temperature can be easily controlled within an allowable range.

Further, even when the load changes in accordance with the operation command of the power plant and the bed height is operated in accordance with the load change, the fuel amount is operated in accordance with the bed temperature. It is possible to prevent the temperature or the steam temperature from deviating from the allowable range, and to contribute to the improvement of the load changing speed.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a combined pressurized fluidized-bed power generation system showing an embodiment of the present invention, and FIG. 2 is an overall block diagram of a combined pressurized fluidized-bed power generation system.

In FIG. 2, a combined pressurized fluidized bed power generation system includes a steam turbine generator 10, a steam turbine 12,
Pressurized fluidized bed boiler 14, fluidized medium container (BM tank) 1
6, cyclone 18, compressor 20, gas turbine 22,
A gas turbine generator 24 and a chimney 26 are provided.

The pressurized fluidized-bed boiler 14 has a furnace 30 housed in a pressure vessel 28, and the inside of the furnace 30 is divided into two chambers by a dispersion plate 32. The lower chamber is configured as a wind box 34, into which compressed air is introduced from the compressor 20 via a line (pipe) 36. The compressed air introduced into the wind box 34 is
Is introduced into a chamber above the dispersion plate 32 through the combustion air nozzle 38 of the first embodiment. A heat transfer tube 40 is accommodated in a room above the dispersion plate 32, and a fluidized bed 42 is formed around the heat transfer tube 40. Fluidized bed 42
Is based on coal and air as fuel and fluid medium particles (Be
d Material) 44 is formed.
In order to form the fluidized bed 42 in the furnace 30, a fuel supply line 44 and a BM (Bed M
a supply line 46 is provided, coal is introduced into the furnace 30 via the fuel supply line 44, and the flowing medium 44 in the flowing medium container 16 is introduced into the furnace 30 via the BM supply line 46. It is supposed to be.

A BM transfer air flow control valve 48 is provided in the middle of the BM supply line 46. When the control valve 48 is opened, BM transfer air (aeration gas) gas is introduced into the BM supply line 46. The fluid medium particles 44 are introduced from the fluid medium container 16 into the furnace 30. A BM extraction line 52 is provided substantially at the center of the dispersion plate 32, and the other end of the line 52 is connected to the upper side of the fluid medium container 16. Further, in the middle of the line 52, a BM slide air flow control valve BM
A lift air flow control valve 54 is provided.
When BM slide air 56 opens line 52
BM lift air 58 is introduced into the line 52 when the control valve 54 is opened. Then, when air 56 and 58 are introduced into the line 52, the fluid medium particles 44 in the furnace 30 are extracted out of the furnace 30 and fed to the fluid medium container 16. That is, the fluid medium container 16 and the BM supply line 4
6, BM extraction line 52, control valves 48, 52, 54
Is constructed as a bed height operating means, and by opening the control valve 48, the bed height of the fluidized bed 42 is increased and the control valves 52, 5
Opening the bed 4 lowers the bed height of the fluidized bed 42. The furnace 30 is provided with a bed height detector (not shown) as bed height detecting means for detecting the bed height of the fluidized bed 42.

The coal in the fluidized bed 42 is ignited and burned by the high-temperature combustion air, and heat energy from the combustion of the coal is transmitted to the heat transfer tube 40 as heat energy of the fluidized bed 42. The heat transfer tube 40 is connected to the steam turbine 12 via lines 60 and 62, and the heat transfer tube 40 includes a condenser 64,
Water is introduced via a pump 66. When the heat transfer tube 40 is heated by the thermal energy of the coal, the heat transfer tube 4
From 0, steam is generated, and this steam is sent to the steam turbine 12 via the line 60. The steam turbine 12 converts the energy of the steam into rotational energy, and rotationally drives the generator 10 with the rotational energy. The temperature of the steam supplied to the steam turbine 12 is detected by a steam temperature measuring device 68 as steam temperature detecting means.

When the coal in the fluidized bed 42 is burned, combustion exhaust gas of, for example, 10 atm and 860 ° C. is generated in the furnace 30, and the combustion exhaust gas is discharged to the cyclone 18 via the line 70. The combustion exhaust gas sent to the cyclone 18 is sent to the gas turbine 22 via the line 72. The gas turbine 22 converts energy from the combustion exhaust gas into rotational energy, and rotationally drives the generator 24 with the rotational energy. Further, the combustion exhaust gas discharged from the gas turbine 22 is discharged through a chimney 26.

In the pressurized fluidized-bed combined power generation system having the above-described configuration, the fuel amount is controlled in accordance with the load command, the fuel amount is controlled so as to maintain the steam temperature at the set temperature, and the bed temperature is maintained at the set value. In order to operate the bed height or to control the fuel amount based on the bed temperature, the amount of coal supplied to the fuel supply line 44 and the control valves 48, 52, A control device for controlling the opening degree of 54 is provided.

As shown in FIG. 1, this control device comprises a steam temperature measuring device 68, a subtractor 70, a controller 72, a function generator 74, adders 76 and 78, a bed temperature measuring device 80, and a subtractor 8
2. It comprises a gain unit 84, a controller 86, a switch 88, a condition determiner 90, a controller 92, an adder 94, a function generator 96, a layer height measuring device 98, a subtractor 100, and a controller 102. ing.

The subtracter 70 generates a steam temperature deviation 104 indicating the difference between the steam temperature measured by the steam temperature measuring device 68 and the set value of steam temperature (target value), and outputs it to the controller 72. . The controller 72 performs a proportional / integral operation on the steam temperature deviation 104 in order to generate a control signal for bringing the actual steam temperature closer to the set value, and sends the control signal according to the operation result to the adder 76. Output. The fuel amount set value 106 according to the load command is input from the function generator 74 to the adder 76. The fuel amount set value 106 is set to a value that increases the fuel amount according to an increase in the load command. When the fuel amount set value 106 and the control signal from the controller 72 are added by the adder 76, the fuel amount target value 108 is output from the adder 76, and the fuel amount target value 108 is input to the adder 78. You. The adder 78 outputs the fuel amount command value 110 corrected according to the signal from the switch 88 when there is a signal from the switch 88. When the signal from the switch 88 is not input,
A fuel amount command value 110 is output according to the fuel amount target value 108. And the fuel amount command value 110
, The supply amount of coal introduced into the fuel supply line 44 is controlled. That is, in the process of operating the fuel supply amount according to the load command, the steam temperature is monitored, the load command is corrected so as to maintain the steam temperature at the set value, and the coal supply amount is controlled according to the corrected load command. It is supposed to be.

On the other hand, a subtractor 82 is a bed temperature measuring device 82 as bed temperature detecting means for detecting the bed temperature in the fluidized bed 42.
A layer temperature deviation signal 112 indicating the deviation between the layer temperature and the layer temperature set value (layer temperature target value) based on the measurement of the temperature is generated, and the layer temperature deviation signal 112 is output to the gain unit 84 and the controller 92. ing. The gain device 84 integrates the gain K with the layer temperature deviation signal 112 and outputs the integrated signal to the controller 86. The controller 86 performs a proportional operation on the signal from the gain unit 84, and outputs the operation result via a switch 88 to an adder 78.
Output. The switch 88 switches the output signal of the controller 86 in response to the switch signal 113 from the condition determiner 90.

For example, in response to the switching signal 113 outputted by the condition judging device 90 on the condition that it is judged that the load is increasing or the layer temperature exceeds the set value, the controller 86 sends the signal from the controller 86. The signal is output to the adder 78, and at other times, the input of the signal from the controller 86 is prohibited. When the switch 88 selects the signal from the controller 86 and outputs it to the adder 78 in response to the switch signal 113 from the condition determiner 90, the controller 86
, The fuel amount target value 108 is corrected, and the corrected fuel amount command value 110 is output from the adder 78. That is, the fuel amount target value 108 is corrected in accordance with the deviation between the actual layer temperature and the layer temperature set value under the condition that the load is rising or the layer temperature exceeds the set value, and the corrected fuel amount target value A fuel amount command value 110 in accordance with 108 is generated. Thus, the fuel amount can be controlled also by the bed temperature.

On the other hand, the controller 92 performs a proportional / integral operation on the layer temperature deviation signal 112 to generate a control signal for suppressing the deviation between the actual layer temperature and the layer temperature set value to zero.
This control signal is output to the adder 94. The layer height set value 114 is added to the adder 94 by the function generator 96.
Is entered from The function generator 96 generates a layer height setting value 114 according to the load command, and the layer height setting value 114 is set to a value at which the layer height increases as the load command increases. When the signal from the controller 92 and the layer height set value 114 are added by the adder 94, a layer height command value 116 is generated, and the layer height command value 116 is
00 is input. The subtractor 100 includes a bed height detector 9 as a bed height detecting means for detecting the bed height of the fluidized bed 42.
The layer height measurement value by the measurement of No. 8 is input. Subtractor 1
00 generates a layer height deviation signal 118 indicating the deviation between the layer height command value 116 and the measured layer height value, and outputs the layer height deviation signal 118 to the controller 102. Controller 10
2 performs a proportional / integral operation on the layer height deviation signal 118, generates a layer height control signal 120 for suppressing the deviation between the layer height command value 116 and the measured layer height to zero, and controls the layer height control. The signal 120 is used as the layer height operation command 122 and the control valves 48, 5
2, 54. That is, in the process of operating the bed height based on the bed height set value 114 according to the load command, the bed height set value is corrected to suppress the deviation between the actual bed temperature and the set value to zero, The layer height setting value is corrected based on the actual layer height, and the layer height is operated according to the corrected layer height setting value.

In the above configuration, when the pressurized fluidized-bed boiler 14 is operated with a constant load, the fuel amount and the bed height are operated based on the load command, and the fuel amount is determined by the actual steam temperature and the set value. The operation is performed so that the deviation from is zero. Further, the bed height is operated so that the deviation between the actual bed temperature and the set value becomes zero. In this case, since the signal from the controller 86 is not input to the adder 78, the fuel amount target value 108 is input to the adder 78 without being corrected by the signal from the controller 86, and the fuel amount target value 108 follows the fuel amount target value 108. The supplied amount of coal is operated according to the fuel amount command value 110. Furthermore, in this case, since the change in bed height is small, the change in bed temperature and steam temperature is also small.

Next, as shown in FIG. 3, when the operation for increasing the load command is performed, the fuel amount set value 106,
Both the bed height setting value 114 becomes a high value, the switching signal 113 is output from the condition determination unit 90, and a system for operating the fuel amount also depending on the bed temperature is formed. This increases the amount of coal charged into the fuel supply line 44 and increases the amount of fluidized medium particles 44 charged into the furnace 30. The bed temperature is lowered by the introduction of the low-temperature fluidized medium particles 44 into the furnace 30. However, since the operation of increasing the fuel amount is performed as the bed temperature decreases, the bed temperature is increased with the increase in the fuel amount. The temperature is prevented from falling below the allowable range. Furthermore, a decrease in the bed temperature is suppressed by gradually increasing the bed height. Further, by suppressing the lowering of the bed temperature, the temperature (main steam temperature) of the steam supplied to the steam turbine 12 is suppressed from falling below the allowable range. Then, in the process of increasing the fuel amount with the increase of the bed height and maintaining the bed temperature within the allowable range,
When the bed temperature reaches the set value, the operation for increasing the fuel amount is stopped, and the fuel amount is operated to a substantially constant value. Thereafter, the bed height is controlled to a substantially constant value, the bed temperature and the main steam temperature are both maintained within allowable ranges, and the power plant can be operated stably.

[0039]

As described above, according to the present invention,
A system that operates the fuel amount based on the load command and controls the fuel amount so as to suppress the deviation between the actual steam temperature and the set value to zero, and the deviation between the actual bed temperature and the set value becomes zero To have a relationship with the system that operates the layer height,
Since the fuel amount is also controlled by the bed temperature, the bed temperature and the steam temperature can be controlled in a coordinated manner,
Even if it becomes difficult to control the bed temperature by controlling the bed height, the fuel amount is controlled by the bed temperature, the deviation of the bed temperature from the target value can be reduced, and the bed temperature and steam temperature are controlled within the allowable range. can do. Further, even when the load is changed and the bed height is controlled in the power plant, the fuel amount is controlled by the bed temperature, so that the bed temperature and the steam temperature can be maintained within the allowable range, and the plant can be safely operated. Can be achieved, and the load change speed can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device for controlling a combined pressurized fluidized-bed power generation system according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a pressurized fluidized bed combined cycle system.

FIG. 3 is a time chart for explaining a control method of the combined pressurized fluidized bed power generation system shown in FIG. 2;

[Explanation of symbols]

 10 Steam Turbine Generator 12 Steam Turbine 14 Pressurized Fluidized Bed Boiler 16 Fluid Medium Container 22 Gas Turbine 24 Gas Turbine Generator 28 Pressure Vessel 30 Furnace 40 Heat Transfer Tube 42 Fluidized Bed 44 Fluid Medium Particles 68 Steam Temperature Measuring Device 70 Subtraction Device 72 Controller 74 Function generator 76, 78 Adder 80 Layer temperature measuring device 82 Subtractor 84 Gain device 86 Controller 88 Switcher 90 Condition judging device 92 Controller 94 Adder 96 Function generator 98 Layer height measuring device 100 Subtractor 102 Controller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Sato 7-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Inside the Hitachi Research Laboratory, Hitachi, Ltd. (72) Tomohiko Miyamoto 7-1 Omikacho, Hitachi City, Ibaraki Prefecture No. 1 Inside Hitachi, Ltd.Hitachi Research Laboratories (72) Inventor Nobuhiro Hotta 4-1-1 Kanda Surugadai, Chiyoda-ku, Tokyo Within Electricity Business Unit, Hitachi, Ltd. (72) Inventor Eiji Toyama Omikamachi 5 Hitachi, Ibaraki No. 2-1 In the Omika Plant of Hitachi, Ltd. (72) Inventor Yasuyuki Yamamoto 6-9 Takaracho, Kure-shi, Hiroshima Prefecture Inside the Kure Plant of Babcock Hitachi Co., Ltd. (72) Inventor Satoshi Yoshimoto Naka-ku, Hiroshima-shi, Hiroshima Komachi 4-33 Chugoku Electric Power Co., Inc. (72) Inventor Koji Kimura 4-33 Komachi, Naka-ku, Hiroshima-shi, Hiroshima Chugoku Electric Power Stock House

Claims (6)

[Claims] 1. A furnace stored in a pressure vessel, a fluidized bed stored in the furnace to form a layer containing fuel, air, and fluidized medium particles; A heat transfer tube that receives the supply and generates steam by the heat of the fluidized bed, a steam turbine that converts the energy of the steam from the heat transfer tube into rotational energy, a steam turbine generator that is rotationally driven by the steam turbine, A gas turbine that receives exhaust gas from the furnace and converts the energy from the exhaust gas into rotational energy, a gas turbine generator that is driven to rotate by the gas turbine, and the temperature of steam generated from the heat transfer tubes. Steam temperature detecting means for detecting, bed temperature detecting means for detecting the temperature of the fluidized bed in the furnace, bed height detecting means for detecting the height of the fluidized bed in the furnace, load command, Fuel supply amount operation means for controlling the amount of fuel supplied into the furnace based on the detection value of the steam temperature detection means, and flow in the furnace based on the detection values of the bed temperature detection means and the bed height detection means A pressurized fluidized-bed combined power generation system comprising: a bed height operating means for operating the height of the bed; and an operation amount correcting means for correcting the operation amount of the fuel supply amount operating means based on the detection value of the bed temperature detecting means. . 2. The pressurized fluidized-bed combined power generation system according to claim 1, wherein the manipulated variable correction means changes the power generated by at least one of a steam turbine generator and a gas turbine generator. A pressurized fluidized-bed combined power generation system, comprising: an operation amount correction unit that corrects an operation amount of the fuel supply amount operation unit based on a detection value of the bed temperature detection unit on the condition that the operation is performed. 3. The pressurized fluidized-bed combined power generation system according to claim 1, wherein the operation amount correction unit operates the fuel supply amount operation unit in accordance with a deviation between a detection value of the bed temperature detection unit and a set value. A combined pressurized fluidized-bed power generation system, comprising an operation amount correction unit for correcting an amount. 4. The pressurized fluidized-bed combined power generation system according to claim 1, wherein the manipulated variable correction means changes the power generated by at least one of a steam turbine generator and a gas turbine generator. A pressurized fluidized-bed combined power generation system, comprising: an operation amount correction unit that corrects an operation amount of a fuel supply amount operation unit according to a deviation between a detection value of a bed temperature detection unit and a set value on condition that the operation is performed. . 5. The steam generated from the pressurized fluidized-bed boiler is supplied to a steam turbine, a generator for the steam turbine is driven by the steam turbine, and the combustion exhaust gas generated from the pressurized fluidized-bed boiler is supplied to the gas turbine. When a gas turbine generator is driven by a gas turbine, the amount of fuel supplied to the pressurized fluidized-bed boiler is controlled based on the temperature of steam generated from the pressurized fluidized-bed boiler and a load command. Based on the temperature of the fluidized bed in the boiler, the height of the fluidized bed in the pressurized fluidized bed boiler is controlled, and further, the operation amount for controlling the amount of fuel supplied to the pressurized fluidized bed boiler is controlled by the pressurized fluidized bed. A method for controlling a combined pressurized fluidized-bed power generation system, wherein the correction is performed based on the temperature of a fluidized bed in a bed boiler. 6. The steam generated from the pressurized fluidized-bed boiler is supplied to a steam turbine, a generator for the steam turbine is driven by the steam turbine, and the combustion exhaust gas generated from the pressurized fluidized-bed boiler is supplied to the gas turbine. When a gas turbine generator is driven by a gas turbine, the amount of fuel supplied to the pressurized fluidized-bed boiler is controlled based on the temperature of steam generated from the pressurized fluidized-bed boiler and a load command. Based on the temperature of the fluidized bed in the bed boiler, the height of the fluidized bed in the pressurized fluidized bed boiler is controlled, and the operation amount for controlling the amount of fuel supplied to the pressurized fluidized bed boiler is also controlled by the pressurized fluidized bed. A control device for a pressurized fluidized-bed combined power generation system, which is corrected based on a temperature of a fluidized bed in a boiler.