JP5989218B1 - Air circulation control device and air circulation control method in power plant - Google Patents

Abstract

The present invention efficiently prevents an operation area of a power plant from being reduced due to the temperature of air supplied to the power plant without providing an auxiliary combustion device in the exhaust heat recovery boiler. An air circulation control device (10) acquires a temperature acquisition unit (11) for acquiring the temperature of air supplied to the power plant (1) from the outside, and acquires state information indicating the operation state of a predetermined device of the power plant (1). Based on the temperature of the air acquired by the state information acquisition unit 12 and the temperature acquisition unit 11 and the state information acquired by the state information acquisition unit 12, the temperature of the air supplied to the power plant 1 generates power. When the determination unit 13 determines whether or not the operation region of the plant 1 is reduced, and the determination unit 13 determines that the operation region of the power plant 1 is reduced, the air compressed by the air compressor 102 is circulated. A circulation control unit 14 is provided for mixing the compressed air with the air supplied to the power plant 1. [Selection] Figure 1

Description

  The present invention relates to an air circulation control device and an air circulation control method in a power plant.

  Conventionally, a combined cycle power plant including a gas turbine, an exhaust heat recovery boiler, and a steam turbine is known. A combined cycle power plant is a plant that supplies gas discharged from a gas turbine to an exhaust heat recovery boiler and supplies steam generated by the exhaust heat recovery boiler to the steam turbine by the heat of the gas to drive a generator. .

  When the temperature of the air supplied to the combined cycle power plant (outside temperature) decreases, the amount of steam generated in the exhaust heat recovery boiler decreases, so the operating area of the power plant can be reduced (operating efficiency decreases). obtain). Patent Document 1 discloses an exhaust heat recovery boiler including an auxiliary combustion device such as a burner. According to this exhaust heat recovery boiler, when the steam generation amount decreases, the steam generation amount can be increased by raising the temperature of the internal gas by the auxiliary combustion device, and the operating range (operation efficiency) of the power plant can be increased. Can be maintained or expanded.

  However, the exhaust heat recovery boiler disclosed in Patent Document 1 has a problem in terms of public health and the environment because harmful gas and greenhouse gas are generated by using the auxiliary combustion device.

JP 2012-251671 A

  The present invention has been made in view of such circumstances, and the operating range of the power plant is reduced due to the temperature of the air supplied to the power plant without providing an auxiliary combustion device in the exhaust heat recovery boiler. It is an object of the present invention to provide an air circulation control device in a power plant that can efficiently prevent the above.

In order to achieve the above object, an air circulation control device in a power plant of the present invention comprises:
Temperature acquisition means for acquiring the temperature of air supplied to the power plant from outside;
State information acquisition means for acquiring state information representing a state of operation of a predetermined device of the power plant;
Whether or not the operating area of the power plant is reduced due to the temperature of the air supplied to the power plant based on the temperature of the air acquired by the temperature acquisition unit and the state information acquired by the state information acquisition unit Discriminating means for discriminating;
When the operating means of the power plant is determined to be reduced by the discriminating means, the air compressed by the air compressor provided in the power plant is circulated, and the compressed air is mixed with the air supplied to the power plant. Circulation control means.

It is the figure which showed the structure of the power plant provided with the air circulation control apparatus which concerns on one embodiment of this invention. It is the figure which showed the structure of the status information list memorize | stored in the memory | storage part shown in FIG. It is the figure which showed the structure of the condition list memorize | stored in the memory | storage part shown in FIG. It is the flowchart which showed the air circulation control process which an air circulation control apparatus performs. It is the figure which showed the structure of the power plant which concerns on the modification of this invention. It is the figure which showed the data divided into the normal operation area | region and the air circulation area | region about the combination of external temperature and a gas turbine operation rate. It is the figure which showed the data divided into the normal operation area | region, the air circulation area | region, and the operation impossible area | region about the combination of external temperature and a gas turbine operation rate.

  Hereinafter, an air circulation control device in a power plant according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the power plant 1 is a combined cycle power plant and includes an air circulation control device 10. The air circulation control device 10 is for preventing the operating area of the power plant from being reduced (operating efficiency is reduced) due to the temperature (outside air temperature) of the air supplied to the power plant 1.

  The air circulation control device 10 includes a temperature acquisition unit 11, a state information acquisition unit 12, a determination unit 13, a circulation control unit 14, and a storage unit 15.

  The temperature acquisition unit 11, the state information acquisition unit 12, the determination unit 13, and the circulation control unit 14 are, for example, a control provided with a CPU (Central Processing Unit), a RAM (Random Access Memory) that functions as a main memory of the CPU, and the like. Consists of devices.

  The temperature acquisition unit 11 acquires the temperature (outside air temperature) of the air supplied to the power plant 1 from the outside. Specifically, the temperature acquisition unit 11 acquires the temperature of air supplied to the intake port of the intake duct 101 by receiving a temperature detection signal from a temperature sensor provided near the intake port of the intake duct 101.

  The state information acquisition unit 12 refers to a state information list (FIG. 2) to be described later, and acquires state information indicating the state of operation of a predetermined device of the power plant 1.

  Based on the temperature of the air acquired by the temperature acquisition unit 11 and the state information acquired by the state information acquisition unit 12, the determination unit 13 causes the temperature of the air supplied to the power generation plant 1 to be the cause. It is discriminate | determined whether the driving | operation area | region reduces (whether the operating efficiency of the power plant 1 falls).

  The circulation control unit 14 controls the air circulation valve member Cv when the determination unit 13 determines that the operation region of the power plant 1 is reduced. By controlling the air circulation valve member Cv, the air compressed by the air compressor 102 is supplied (circulated) to the intake duct 101 and mixed with external air supplied to the intake duct 101.

  The storage unit 15 includes a storage device such as a ROM (Read Only Memory) and a flash memory. The storage unit 15 stores programs and data used by the temperature acquisition unit 11, the state information acquisition unit 12, the determination unit 13, and the circulation control unit 14 to perform various processes. Characteristically, the storage unit 15 stores an air circulation control program, a state information list, and a condition list.

  The air circulation control program is a program for performing an air circulation control process (FIG. 4) described later. By executing the air circulation control program, the control device functions as a temperature acquisition unit 11, a state information acquisition unit 12, a determination unit 13, and a circulation control unit 14.

  As shown in FIG. 2, the state information list includes a list of state information acquired by the state information acquisition unit 12. As the state information to be acquired, the physical quantity of the device that changes according to the change in the outside air temperature is set. Specifically, the state information includes the exhaust gas temperature (Tb) of the gas turbine 104, the power generation amount (Ea) of the gas turbine generator 105, the opening degree (Oa, Ob) of the steam turbine valve member 107, and the steam turbine generator. There are 109 power generation amount (Eb), condenser 110 water level (Wa), water supply tank 111 water reception amount (Wb), and water supply tank 111 water supply amount (Wc).

  The state information list includes acquisition necessity information indicating whether or not the state information needs to be acquired. The status information acquisition unit 12 acquires status information whose acquisition necessity information is “necessary” in the status information list. The acquisition necessity information is set and changed by an administrator of the power plant 1 or the like.

In the condition list, conditions are set for each state information. In the condition, a relationship between state information and a threshold value is set. Each threshold value is set on the basis of state information (physical quantity) when the operation region of the power plant 1 is reduced from a preset operation region (for example, operation is impossible) due to the outside air temperature.
Specifically, the following is set as a condition.
(1) The exhaust gas temperature (Tb) of the gas turbine 104 is not more than a threshold value (Tb ≦ Tth2).
(2) The power generation amount (Ea) of the gas turbine generator 105 is equal to or greater than a threshold value (Ea ≦ Eth1)
(3) When the steam turbine 108 is operating at a constant output, the opening degree (Oa) of the steam turbine valve member 107 is equal to or greater than a threshold value (Oth1 ≦ Oa).
(4) When the steam turbine 108 is operating at a constant inlet steam pressure, the opening degree (Ob) of the steam turbine valve member 107 is equal to or less than a threshold value (Ob ≦ Oth2).
(5) The power generation amount (Eb) of the steam turbine generator 109 is equal to or less than a threshold value (Eb ≦ Eth2)
(6) The condensate amount (Wa) of the condenser 110 is less than or equal to the threshold value (Wa ≦ Wth1).
(7) The amount of water received (Wb) in the water supply tank 111 is equal to or less than a threshold value (Wb ≦ Wth2)
(8) Water supply amount (Wc) of water supply tank 111 is not more than a threshold value (Wc ≦ Wth3)

  Next, the structure of the various apparatuses 101-111 of the power plant 1 shown in FIG. 1 is demonstrated.

  The intake duct 101 sucks external air and supplies the sucked air to the air compressor 102. The intake duct 101 sucks air (compressed air) compressed to high temperature and high pressure supplied from the air compressor 102 via the circulation part C. The intake duct 101 mixes the sucked external air with compressed air, and supplies the air whose temperature has been increased by the compressed air to the air compressor 102. The intake duct 101 includes an air filter, and dust and moisture contained in the sucked air are removed by the air filter. Further, a temperature sensor is disposed near the intake port of the intake duct 101. The intake duct 101 supplies the temperature acquisition unit 11 with a temperature detection signal detected by the temperature sensor in response to a request from the temperature acquisition unit 11.

  The air compressor 102 sucks air supplied from the intake duct 101 and compresses the sucked air to high temperature and high pressure. The air compressor 102 supplies the compressed air to the circulation unit C and the combustor 103.

  The circulation part C is a pipe for circulating the air compressed by the air compressor 102. The circulation unit C supplies the compressed air received from the air compressor 102 to the intake duct 101. The circulation part C is connected to an extraction port provided separately from the discharge port of the air compressor 102, and receives compressed air from the extraction port. The circulation section C is connected to a circulation intake port provided separately from the intake port of the intake duct 101, and supplies the compressed air received from the extraction port to the circulation intake port.

  The circulation part C includes an air circulation valve member Cv. The air circulation valve member Cv is provided in the air supply path between the extraction port of the air compressor 102 and the circulation intake port of the intake duct 101. The air circulation valve member Cv is opened and closed by a control signal received from the circulation control unit 14, thereby switching between supply (circulation) and stop of compressed air.

  The combustor 103 burns the air received from the air compressor 102 with the fuel supplied from the fuel system. The combustor 103 supplies high-temperature and high-pressure combustion gas to the gas turbine 104.

  The gas turbine 104 is a turbine that includes a stationary blade that rectifies fluid and a moving blade that converts fluid energy into rotational motion. The gas turbine 104 is rotated by the combustion gas received from the combustor 103 and drives the gas turbine generator 105. The exhaust gas temperature (Tb) of the gas turbine 104 decreases as the outside air temperature decreases. A temperature sensor is disposed in the vicinity of the discharge port of the gas turbine 104. The gas turbine 104 supplies state information representing the exhaust gas temperature (Tb) detected by the temperature sensor to the state information acquisition unit 12 in response to a request from the state information acquisition unit 12.

  The gas turbine generator 105 is a generator that includes a rotor, a stator coil, and a stator core. The gas turbine generator 105 generates power using rotational energy obtained from the gas turbine 104. The power generation amount (Ea) of the gas turbine generator 105 increases as the outside air temperature decreases. The gas turbine generator 105 supplies state information representing the amount of power generation (Ea) to the state information acquisition unit 12 in response to a request from the state information acquisition unit 12.

  The exhaust heat recovery boiler 106 receives the exhaust gas discharged from the gas turbine 104. The exhaust heat recovery boiler 106 includes various heat exchangers such as a superheater, an evaporator, and a economizer, and converts the exhaust gas into steam through the various heat exchangers. The amount of steam generated in the exhaust heat recovery boiler 106 decreases as the outside air temperature decreases. The exhaust heat recovery boiler 106 supplies steam to the steam turbine 108 via the steam turbine valve member 107.

  The steam turbine valve member 107 adjusts the amount of steam supplied to the steam turbine 108 and is provided between the exhaust heat recovery boiler 106 and the steam turbine 108. The opening degree of the steam turbine valve member 107 is controlled by a device (not shown) that controls the steam turbine 108.

  For example, when the steam turbine 108 is operated at a constant output and the steam generation amount of the exhaust heat recovery boiler 106 decreases, the steam turbine valve member 107 is opened to maintain the amount of steam supplied to the steam turbine 108. The degree (Oa) increases. On the other hand, when the steam generation amount of the exhaust heat recovery boiler 106 decreases when the steam turbine 108 is operated at a constant inlet steam pressure, the opening degree of the steam turbine valve member 107 is maintained in order to maintain the inlet pressure of the steam turbine 108. (Ob) becomes smaller. In response to a request from the state information acquisition unit 12, the steam turbine valve member 107 supplies state information indicating the opening degree (Oa or Ob) to the state information acquisition unit 12.

  The steam turbine 108 is a turbine that includes a stationary blade that rectifies fluid and a moving blade that converts fluid energy into rotational motion. The steam turbine 108 is rotated by the steam supplied from the exhaust heat recovery boiler 106 via the steam turbine valve member 107, and drives the steam turbine generator 109.

  The steam turbine generator 109 is a generator that includes a rotor, a stator coil, and a stator core. The steam turbine generator 109 generates power using rotational energy obtained from the steam turbine 108. The power generation amount (Eb) of the steam turbine generator 109 decreases as the outside air temperature decreases. The steam turbine generator 109 supplies state information representing the amount of power generation (Eb) to the state information acquisition unit 12 in response to a request from the state information acquisition unit 12.

  The condenser 110 cools and condenses the steam discharged from the steam turbine, and condenses it. The amount of condensate (Wa) condensed by the condenser 110 decreases as the outside air temperature decreases. The condenser 110 supplies state information representing the condensate amount (Wa) to the state information acquisition unit 12 in response to a request from the state information acquisition unit 12.

  The water supply tank 111 receives the water condensed by the condenser 110. The amount of water received (Wb) received by the water supply tank 111 decreases as the outside air temperature decreases. In response to a request from the state information acquisition unit 12, the water supply tank 111 supplies state information representing the amount of water received (Wb) to the state information acquisition unit 12.

  The water supply tank 111 supplies the stored water to the exhaust heat recovery boiler 106. The amount of water (Wc) supplied to the exhaust heat recovery boiler 106 decreases as the outside air temperature decreases. In response to a request from the state information acquisition unit 12, the water supply tank 111 supplies state information representing the water supply amount (Wc) to the state information acquisition unit 12.

  For the power plant 1 configured as described above, the air circulation control process executed by the air circulation control device 10 will be described below with reference to FIG.

  The air circulation control device 10 executes the air circulation control program stored in the storage unit 15 when the power is turned on. Thereby, the temperature acquisition part 11, the state information acquisition part 12, the discrimination | determination part 13, and the circulation control part 14 function, and the air circulation control process comprised from step S101-S107 is performed by these.

  The circulation control unit 14 determines whether or not the compressed air is being circulated at predetermined time intervals based on the state of the air circulation valve member Cv (step S101).

  If the circulation control unit 14 determines that the compressed air is not circulated (step S101; NO), the temperature acquisition unit 11 requests the intake duct 101 to detect the temperature. The temperature acquisition unit 11 acquires the temperature (Ta) of air supplied from the outside to the power plant 1 based on the temperature detection signal received from the intake duct 101.

  In this case, the state information acquisition unit 12 refers to the state information list stored in the storage unit 15, and acquires the state information in which the acquisition necessity information is set to “necessary” (step S102). In the state information list shown in FIG. 2, the state information acquisition unit 12 generates the power generation amount (Ea) of the gas turbine generator 105, the opening degree (Oa) of the steam turbine valve member 107, and the power generation of the steam turbine generator 109. Each state information representing the amount (Eb) and the amount of water received (Wb) in the water supply tank 111 is acquired.

  Based on the outside air temperature (Ta) acquired by the temperature acquisition unit 11 and the state information acquired by the state information acquisition unit 12 (here, Ea, Oa, Eb, Wb), the determination unit 13 Therefore, it is determined whether or not the operating area of the power plant 1 is reduced (step S103). Specifically, the determination unit 13 determines that any of the acquired state information is based on the condition list shown in FIG. 3 when the outside air temperature (Ta) is equal to or less than a preset threshold value (Tth1) (Ta ≦ Tth1). When the conditions represented are satisfied, it is determined that the operating range of the power plant 1 is reduced due to the outside air temperature. On the other hand, in other cases, it is determined that the operating range of the power plant 1 is not reduced due to the outside air temperature.

  When it is determined by the determination unit 13 that the operating range of the power plant 1 is reduced due to the outside air temperature (step S103; YES), the circulation control unit 14 performs control for opening the air circulation valve member Cv. A signal is supplied to the air circulation valve member Cv, and the air compressed to high temperature and high pressure by the air compressor 102 is circulated (step S104). That is, in this case, the air circulation valve member Cv is opened by a control signal from the circulation control unit 14, and the temperature of the air sucked into the intake duct 101 is increased by the air compressed by the air compressor 102. Can be made. As a result, it is possible to prevent the operation area (operation efficiency) of the power plant 1 from being reduced. Thereafter, the circulation control unit 14 returns to Step S101.

  On the other hand, in step S103, when it is determined by the determination unit 13 that the operating range of the power plant 1 is not reduced due to the outside air temperature (step S103; NO), the circulation control unit 14 sends the control signal to the valve member for air circulation. Return to step S101 without supplying to Cv. That is, in this case, the air circulation valve member Cv is kept closed, and the compressed air is not circulated.

  Even when the circulation control unit 14 determines that the compressed air is circulated in step S101 (step S101; YES), the temperature acquisition unit 11 requests the intake duct 101 to detect the temperature, similarly to step S102. The temperature acquisition unit 11 acquires the temperature (Ta) of air supplied from the outside to the power plant 1 based on the temperature detection signal received from the intake duct 101.

  In this case, the state information acquisition unit 12 refers to the state information list stored in the storage unit 15 and acquires the state information in which the acquisition necessity information is set to “necessary” as in step S102 (step S102). S105).

  Based on the outside air temperature (Ta) acquired by the temperature acquisition unit 11 and the state information acquired by the state information acquisition unit 12 (here, Ea, Oa, Eb, Wb), the determination unit 13 performs step S103. Similarly, it is determined whether or not the operating range of the power plant 1 is reduced due to the outside air temperature (step S106).

  When it is determined by the determination unit 13 that the operating region of the power plant 1 is not reduced due to the outside air temperature (step S106; NO), the circulation control unit 14 is used for closing the air circulation valve member Cv. A control signal is supplied to the air circulation valve member Cv to stop the circulation of the compressed air (step S107). That is, in this case, the air circulation valve member Cv is closed by the control signal from the circulation control unit 14, and the air compressed by the air compressor 102 is not supplied to the intake duct 101. Thereafter, the circulation control unit 14 returns to Step S101.

  On the other hand, in step S106, when the determination unit 13 determines that the operating range of the power plant 1 is reduced due to the outside air temperature (step S106; YES), the circulation control unit 14 sends the control signal to the air circulation valve member Cv. Without returning to step S101. That is, in this case, the air circulation valve member Cv maintains an open state and continues the circulation of the compressed air.

  The air circulation control process including the above steps S101 to S107 is repeatedly performed until the execution of the air circulation control program is stopped.

  As described above, the air circulation control device 10 according to the present embodiment is configured so that the temperature of the air supplied from the outside to the intake duct 101 of the power plant 1 and the state of operation of the predetermined equipment of the power plant 1 are determined. Is obtained, and based on the obtained air temperature and state information, it is determined whether or not the operating area of the power plant 1 is reduced due to the temperature of the air supplied to the power plant 1. . In addition, when it is determined that the operation region of the power plant 1 is reduced, the air circulation control device 10 circulates the air compressed by the air compressor 102 provided in the power plant 1 and is supplied to the intake duct 101. The temperature of the air is raised by the compressed air. Thereby, since the air after the temperature rise is supplied to the air compressor 102, it is possible to efficiently prevent the operating region of the power plant 1 from being reduced due to the outside air temperature. In addition, since the air circulation control device 10 is not provided with an auxiliary combustion device such as a burner, neither harmful gas nor greenhouse gas is generated, which is preferable from the viewpoint of public health and the environment.

  In the case where the compressed air is not circulated, if any of the state information satisfies the conditions even though the outside air temperature (Ta) is not less than or equal to the threshold value (Tth), for example, a failure or breakage may occur. There is a possibility that the operating area of the power plant 1 may be reduced due to causes other than the temperature. Therefore, in this case, the circulation control unit 14 may notify the administrator of the power plant 1 of the error. Specifically, when the outside air temperature (Ta) is not equal to or lower than the threshold value (Tth) but the state information indicating the power generation amount (Eb) of the steam turbine generator 109 satisfies the condition, the circulation control unit 14 Notifies that the abnormality has occurred in or around the steam turbine generator 109 that is the supply source of the state information.

  Moreover, the power plant 1 demonstrated by the said embodiment was mentioned as an example, and the air circulation control apparatus 10 may be provided in another power plant. Further, the state information acquired by the state information acquisition unit 12 is not limited to the state information included in the state information list shown in FIG. Further, the conditions (relationship between the state information and the threshold value) shown in the condition list shown in FIG. 3 can be set as appropriate.

  For example, as shown in FIG. 5, the power plant 1 ′ may add a drive turbine valve member 112, a fuel compressor drive turbine 113, and a fuel compressor 114 to the configuration of the power plant shown in FIG. . The power plant 1 ′ compresses a low calorie fuel such as by-product gas, and mixes and burns it with a high calorie fuel such as city gas. Since the fuel compressor drive turbine 113 is driven by steam supplied from the exhaust heat recovery boiler 106, the operating region is narrower than that of the power plant 1 shown in FIG. Further, the supply priority of the steam supplied from the exhaust heat recovery boiler 106 to the fuel compressor drive turbine 113 is higher than that of the steam supplied from the exhaust heat recovery boiler 106 to the steam turbine 108.

  When the power plant 1 ′ configured as described above includes the air circulation control device 10, the state information list stored in the storage unit 15 of the air circulation control device 10 includes the opening degree of the steam turbine valve member 107. And the opening degree of the drive turbine valve member 112. Further, the threshold value of the opening degree of the steam turbine valve member 107 and the threshold value of the opening degree of the driving turbine valve member 112 are set in the condition list stored in the storage unit 15. Each threshold value is set on the basis of state information (physical quantity) when the operation region of the power plant 1 is reduced from a preset operation region (for example, operation is impossible) due to the outside air temperature. In this case as well, the air circulation control device 10 performs the same processing as in the above embodiment, and when it is determined that the operating range of the power plant 1 ′ is reduced, the air compressed by the air compressor 102 Is prevented from reducing the operating area of the power plant 1 ′.

  In addition, as shown in FIG. 6, the storage unit 15, for the combination of the outside air temperature and the operating rate (state information) of the gas turbine 104, the area where the compressed air is not circulated (normal operation area) and the compressed air May be stored in a region that is classified into a region requiring air (air circulation region). In this case, the determination unit 13 of the air circulation control device 10 refers to the data stored in the storage unit 15, the outside air temperature acquired by the temperature acquisition unit 11, and the gas turbine acquired by the state information acquisition unit 12. It is determined whether the combination with the operation rate of 104 belongs to the normal operation region or the air circulation region. When the combination of the outside air temperature and the operating rate of the gas turbine 104 belongs to the air circulation region, the determination unit 13 determines that the operation region of the power plant 1 is reduced due to the outside air temperature. On the other hand, when the combination of the outside air temperature and the operating rate of the gas turbine 104 belongs to the normal operation region, the determination unit 13 determines that the operation region of the power plant 1 is not reduced due to the outside air temperature.

  In addition, as shown in FIG. 7, the storage unit 15, for the combination of the outside air temperature and the operating rate (state information) of the gas turbine 104, is a region where the compressed air is not circulated (normal operation region), and the compressed air is circulated. In addition to a region where the power is required (air circulation region), data including a region where the operation of the power plant cannot be performed (a region where operation is not possible) may be stored. When the combination of the outside air temperature acquired by the temperature acquisition unit 11 and the operating rate of the gas turbine 104 acquired by the state information acquisition unit 12 belongs to the non-operable region, the determination unit 13 of the air circulation control device 10 In this case, the circulation control unit 14 may notify the administrator of the power plant 1 of an error.

  Moreover, in the said embodiment, although the threshold value of external temperature was made fixed, you may change the threshold value of external temperature according to state information. For example, you may set so that the threshold value of outside temperature (Ta) may become low as the operation rate of the gas turbine 104 which is state information becomes high. In this case, the determination unit 13 of the air circulation control device 10 acquires the threshold value of the outside air temperature (Ta) corresponding to the operating rate of the gas turbine 104 acquired by the state information acquisition unit 12. When the threshold value of the outside air temperature is set to change according to the state information, even if the outside air temperature does not change, the discrimination result by the discrimination unit 13 (with the state information acquired by the state information acquisition unit 12) The necessity of circulating compressed air) may be divided.

  Conversely, the threshold value of the state information may be changed according to the outside air temperature. In this case, the determination unit 13 of the air circulation control device 10 acquires the threshold value of the state information corresponding to the outside air temperature acquired by the temperature acquisition unit 11. When the threshold value of the state information is set so as to change according to the outside air temperature, even if there is no change in the state information, the discrimination result (compression) by the discrimination unit 13 based on the outside air temperature acquired by the temperature acquisition unit 11 Necessity of air circulation) may be divided.

  Although some embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1,1 ': Power generation plant 10: Air circulation control apparatus 11: Temperature acquisition part 12: State information acquisition part 13: Discrimination part 14: Circulation control part 15: Storage part 101: Intake duct 102: Air compressor 103: Combustor 104: Gas turbine 105: Gas turbine generator 106: Waste heat recovery boiler 107: Steam turbine valve member 108: Steam turbine 109: Steam turbine generator 110: Condenser 111: Water supply tank 112: Drive turbine valve member 113 : Fuel compressor drive turbine 114: Fuel compressor C: Circulation section Cv: Valve member for air circulation

Claims (9)

Temperature acquisition means for acquiring the temperature of air supplied to the power plant from outside;
State information acquisition means for acquiring state information representing a state of operation of a predetermined device of the power plant;
Based on the temperature of the air acquired by the temperature acquisition unit and the state information acquired by the state information acquisition unit, the operating region of the power plant due to the temperature of the air supplied to the power generation plant Determining means for determining whether or not the image is reduced;
When it is determined by the determining means that the operation area of the power plant is reduced, the compressed air is circulated by the air compressor provided in the power plant, and the compressed air is supplied to the power plant. Circulation control means for mixing with air
Air circulation control device in a power plant. The power plant includes an air circulation valve member for circulating the air compressed by the air compressor,
The circulation control means circulates the air compressed by the air compressor by controlling the air circulation valve member when it is determined by the determination means that the operating range of the power plant is reduced. Mixing the compressed air with the air supplied to the power plant,
The air circulation control device in the power plant according to claim 1. In the case where the temperature of the air acquired by the temperature acquisition unit is equal to or lower than a predetermined temperature, and the state information acquired by the state information acquisition unit satisfies a predetermined condition, Determining whether the operating area of the power plant is reduced;
The air circulation control device in the power plant according to claim 1 or 2. A state information storage unit storing a list of the state information;
The status information acquisition means refers to a list stored in the status information storage means, and acquires the status information;
The air circulation control device in a power plant according to any one of claims 1 to 3. The list of status information stored in the status information storage means includes acquisition necessity information indicating whether or not acquisition is necessary for each status information,
The status information acquisition means acquires status information that needs to be acquired from the acquisition necessity information in the status information list.
The air circulation control device in the power plant according to claim 4. Further comprising condition storage means for storing a condition for each state information;
The determination means refers to the condition stored in the condition storage means, and determines whether or not the state information acquired by the state information acquisition means satisfies a condition corresponding to the state information.
The air circulation control device in a power plant according to any one of claims 1 to 5. The condition storage means sets the relationship between the state information and a threshold as the condition,
The determination means determines whether or not the condition is satisfied depending on whether or not the state information acquired by the state information acquisition means exceeds the threshold value.
The air circulation control device in the power plant according to claim 6. When the air compressed by the air compressor is circulated by the circulation control means, the determination means is acquired by the air temperature acquired by the temperature acquisition means and the state information acquisition means. Based on the state information, it is determined whether the operating area of the power plant is reduced due to the temperature of the air supplied to the power plant,
The circulation control means stops the circulation of the air when it is determined by the determination means that the operation region of the power plant does not decrease.
The air circulation control apparatus in the power plant of any one of Claim 1 to 7. A temperature acquisition step of acquiring the temperature of the air supplied to the power plant from outside;
A state information acquisition step of acquiring state information representing a state of operation of a predetermined device of the power plant;
Based on the temperature of the air acquired in the temperature acquisition step and the state information acquired in the state information acquisition step, the operating region of the power plant due to the temperature of the air supplied to the power plant A determination step for determining whether or not the image is reduced;
When it is determined in the determination step that the operating area of the power plant is reduced, the compressed air is circulated by the air compressor provided in the power plant, and the compressed air is supplied to the power plant. A circulation control step for mixing with the air
Air circulation control method.

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