JP6826962B2 - Compressed air storage power generation device and compressed air storage power generation method - Google Patents

Description

The present invention relates to a compressed air storage power generation device and a compressed air storage power generation method.

Compressed air energy storage (CAES) is known as one of the techniques for smoothing or leveling the fluctuating unstable power generation output.

Patent Document 1 discloses an AA-CAES (Advanced Adiabatic Compressed Air Energy) type compressed air storage power generation device. This compressed air storage power generator includes an air cooler (heat exchanger), a high temperature heat medium tank, an air heater (heat exchanger), and a low temperature heat medium tank. At the time of charging, the compressed air discharged from the compressor is stored in the accumulator tank after heat is recovered by heat exchange with the heat medium in the air cooler. Further, the heat medium whose temperature has been raised by heat recovery is recovered in the high temperature heat medium tank. At the time of power generation, the compressed air stored in the accumulator tank is heated by heat exchange with the heat medium in the air heater and then supplied to the expander. Further, the heat medium whose temperature has been lowered by heat exchange is recovered in the low temperature heat medium tank.

JP-A-2016-48063

In the compressed air storage power generation device disclosed in Patent Document 1, no particular consideration is given to the reduction in efficiency of heat recovery and heat utilization by the heat medium during partial load operation in which the load of charge power generation is less than the rating.

An object of the present invention is to suppress a decrease in efficiency of heat recovery and heat utilization by a heat medium during partial load operation in a compressed air storage power generation device.

A first aspect of the present invention includes a compressor that is mechanically connected to an electric motor and compresses air, and a pressure accumulator that stores compressed air generated by the compressor.
A heat exchanger is exchanged between one expander, which is driven by the compressed air supplied from the accumulator and mechanically connected to the generator, and the compressed air generated by the compressor and a heat medium. A plurality of first heat exchangers for lowering the temperature of the compressed air, a high-temperature heat storage unit for storing the heat medium heated by the heat exchange in the first heat exchanger, and the one expander. A plurality of units that are connected in parallel and exchange heat between the compressed air supplied from the accumulator to the expander and the heat medium supplied from the high temperature heat storage unit to raise the temperature of the compressed air. Two heat exchangers, a low-temperature heat storage unit that stores the heat medium cooled by the heat exchange in the second heat exchanger, and air inlets of the plurality of second heat exchangers are fluidized in the pressure storage unit, respectively. A first air flow path system that fluidly connects the air outlets of the plurality of second heat exchangers to the air supply ports of the one expander, and the individual second heats. A first air flow path system capable of switching the first air flow path system so that the exchanger is set to either a state in which the compressed air flows or a state in which the flow of the compressed air is blocked. The switching unit and the heat medium inlets of the plurality of second heat exchangers are fluidly connected to the high temperature heat storage unit, and the heat medium outlets of the plurality of second heat exchangers are connected to the low temperature heat storage unit. A first heat medium flow path system that is fluidly connected to each other, and a first heat medium pump that is provided in the first heat medium flow path system and sends the heat medium from the high temperature heat storage section to the low temperature heat storage section. Each of the second heat exchangers has a state in which the heat medium flows from the high temperature heat storage section to the low temperature heat storage section and a state in which the flow of the heat medium from the high temperature heat storage section to the low temperature heat storage section is blocked. Based on at least a comparison between the first heat medium flow path system switching unit capable of switching the first heat medium flow path system and the generated power required value with respect to the generated power rated value so as to be set to any of the above. e Bei a control unit for controlling at least said first air flow path system switching section first heating medium channel system switching section, wherein the control unit, the generated power demand value is less than the generated power rated value During partial load power generation, one or more of the plurality of second heat exchangers are blocked from the air flow, and the flow of the heat medium from the high temperature heat storage unit to the low temperature heat storage unit. Provided is a compressed air storage power generation device that controls the first air flow path system switching unit and the first heat medium flow path system switching unit so that is set to a shut-off state .

During partial load power generation, the flow of air to one or more second heat exchangers is blocked. Further, at the time of partial load power generation, the flow of the heat medium from the high temperature heat storage section to the low temperature heat storage section is cut off for the second heat exchanger in which the air flow is cut off. That is, during partial load power generation, one or more second heat exchangers are not used, and the remaining second heat exchangers exchange heat between the compressed air from the accumulator and the heat medium from the high temperature heat storage. Will be done. As a result, it is possible to reduce the flow rate of the heat medium flowing from the high temperature heat storage unit to the low temperature heat storage unit while suppressing a decrease in the flow velocity of the heat medium in the second heat exchanger used for heat exchange during partial load power generation. By suppressing the decrease in the flow velocity of the heat medium in the second heat exchanger used for heat exchange, it is possible to suppress the decrease in the heat exchange performance of the second heat exchanger due to the decrease in the flow velocity of the heat medium. Further, by reducing the flow rate of the heat medium flowing from the high temperature heat storage section to the low temperature heat storage section, it is possible to avoid insufficient temperature drop of the heat medium flowing into the low temperature heat storage section, and the temperature of the heat medium in the low temperature heat storage section is higher than the target value. It is possible to prevent deviation to the high temperature side. From the above, it is possible to suppress a decrease in efficiency of heat utilization of the heat medium during partial load power generation.

More specifically, at the time of the partial load power generation, the control unit cuts off the flow of air for one or more of the plurality of second heat exchangers and of the heat medium. The first air flow path system switching unit and the first heat medium flow path system switching unit are controlled so that the inflow and outflow are stopped, and the control unit controls the first heat medium during the partial load power generation. The flow rate of the heat medium delivered by the pump is reduced.

As an alternative, the first heat medium flow path system is a first heat medium return flow path that fluidly connects the heat medium outlets of the plurality of second heat exchangers and the high temperature heat storage unit. The first heat medium flow path system switching unit switches between communication and disconnection between each of the plurality of second heat exchangers and the high temperature heat storage unit via the first heat medium return flow path. It is possible, and the control unit cuts off the flow of air for one or more of the plurality of second heat exchangers during the partial load power generation, and the high temperature heat storage unit causes the low temperature. The first air flow path system so that the flow of the heat medium to the heat storage section is blocked and the heat medium flows from the heat medium outlet to the high temperature heat storage section via the first heat medium return flow path. It controls the switching unit and the first heat medium flow path system switching unit.

According to this configuration, a heat medium circulation path is formed between the second heat exchanger, which is not used for heat exchange with the compressed air from the accumulator, and the high-temperature heat storage unit during partial load power generation. As a result, the heat medium in the second heat exchanger, which is not used for heat exchange with the compressed air from the pressure storage section, is lowered due to the temperature difference from the outside air temperature while suppressing the decrease in the heat medium storage amount in the high temperature heat storage section. Can be prevented from doing so.

The compressed air storage power generation device further includes a first temperature detection unit that detects the temperature of the heat medium in the low temperature heat storage unit, and the control unit has a predetermined temperature detected by the first temperature detection unit. The first air flow path system switching unit, the first heat medium flow path system switching unit, and the first heat medium pump may be controlled so that the temperature becomes equal to or lower than the set temperature.

The compressed air storage power generation device further includes a first differential pressure detecting unit that detects the differential pressure between the air inlet side and the air outlet side of the plurality of second heat exchangers in the first air flow path system. The control unit switches between the first air flow path system switching unit and the first heat medium flow path system so that the differential pressure detected by the first differential pressure detection unit does not exceed a predetermined pressure loss. The unit and the first heat medium pump may be controlled.

The control unit controls the first air flow path system switching unit and the first heat medium flow path system switching unit so that the usage time is made uniform among the plurality of second heat exchangers. You may.

In the compressed air storage power generation device, the air inlets of the plurality of first heat exchangers are fluidly connected to the discharge ports of the compressors, and the air outlets of the plurality of first heat exchangers are pressure-accumulated. The second air flow path system, which is fluidly connected to each unit, and the individual first heat exchangers are set to either a state in which the compressed air flows or a state in which the flow of the compressed air is blocked. The second air flow path system switching unit capable of switching the second air flow path system and the heat medium inlets of the plurality of first heat exchangers are fluidly connected to the low temperature heat storage unit, respectively. In addition, the second heat medium flow path system in which the heat medium outlets of the plurality of first heat exchangers are fluidly connected to the high temperature heat storage unit and the second heat medium flow path system are provided. A second heat medium pump that sends the heat medium from the low temperature heat storage unit to the high temperature heat storage unit and each of the first heat exchangers are in a state where the heat medium flows from the low temperature heat storage unit to the high temperature heat storage unit. A second heat medium flow path in which the second heat medium flow path system can be switched so that the flow of the heat medium from the low temperature heat storage section to the high temperature heat storage section is cut off. The control unit further includes a system switching unit, and the control unit includes the second air flow path system switching unit and the second heat medium flow path system switching unit based on at least a comparison of the charging power required value with respect to the charging power rated value. At least may be controlled.

Specifically, in the control unit, when the charging power required value is less than the charging power rated value, one or more of the plurality of the first heat exchangers are said to be in the partial load charging. The second air flow path system switching section and the second heat are set so that the flow of air is blocked and the flow of the heat medium from the low temperature heat storage section to the high temperature heat storage section is blocked. The medium flow path system switching unit may be controlled.

During partial load charging, the flow of air to one or more first heat exchangers is blocked. Further, at the time of partial load charging, the flow of the heat medium from the low temperature heat storage section to the high temperature heat storage section is cut off for the first heat exchanger in which the air flow is cut off. That is, during partial load charging, one or more first heat exchangers are not used, and the remaining first heat exchangers exchange heat between the compressed air from the compressor and the heat medium from the low temperature heat storage unit. Will be done. As a result, it is possible to reduce the flow rate of the heat medium flowing from the high temperature heat storage unit to the low temperature heat storage unit while suppressing a decrease in the flow velocity of the heat medium in the first heat exchanger used for heat exchange during partial load charging. By suppressing the decrease in the flow velocity of the heat medium in the first heat exchanger used for heat exchange, it is possible to suppress the decrease in the heat exchange performance of the first heat exchanger due to the decrease in the flow velocity of the heat medium. In addition, by reducing the flow rate of the heat medium flowing from the low temperature heat storage section to the high temperature heat storage section, it is possible to avoid insufficient temperature rise of the heat medium flowing into the high temperature heat storage section, and the temperature of the heat medium in the high temperature heat storage section is higher than the target value. It is possible to prevent deviation to the low temperature side. From the above, it is possible to suppress a decrease in heat recovery efficiency due to the heat medium during partial load charging.

More specifically, at the time of the partial load charging, the control unit cuts off the flow of air for one or more of the plurality of first heat exchangers and of the heat medium. The second air flow path system switching unit and the second heat medium flow rate system switching unit are controlled so that the inflow and outflow are stopped, and the control unit controls the second heat medium during the partial load charging. The flow rate of the heat medium delivered by the pump may be reduced.

As an alternative, the second heat medium flow path system is a second heat medium return flow path that fluidly connects the heat medium outlets of the plurality of first heat exchangers and the low temperature heat storage unit. The second heat medium flow path system switching unit switches between communication and disconnection between the plurality of first heat exchangers and the low temperature heat storage unit via the second heat medium return flow path. It is possible, and the control unit cuts off the flow of air for one or more of the plurality of first heat exchangers during the partial load charging, and the low temperature heat storage unit causes the high temperature. The second air flow path system so that the flow of the heat medium to the heat storage section is blocked and the heat medium flows from the heat medium outlet to the low temperature heat storage section via the second heat medium return flow path. The switching unit and the second heat medium flow path system switching unit may be controlled.

According to this configuration, a heat medium circulation path is formed between the first heat exchanger, which is not used for heat exchange with the compressed air from the compressor, and the low temperature heat storage unit during partial load charging. As a result, the heat medium in the first heat exchanger, which is not used for heat exchange with the compressed air from the compressor, is lowered due to the temperature difference from the outside air temperature while suppressing the decrease in the heat medium storage amount of the low temperature heat storage unit. Can be prevented from doing so.

The compressed air storage power generation device further includes a second temperature detection unit that detects the temperature of the heat medium in the high temperature heat storage unit, and the control unit has a predetermined temperature detected by the second temperature detection unit. The second air flow path system switching unit, the second heat medium flow path system switching unit, and the second heat medium pump may be controlled so that the temperature becomes equal to or higher than the set temperature.

The compressed air storage power generation device further includes a second differential pressure detection unit that detects the differential pressure between the air inlet side and the air outlet side of the plurality of first heat exchangers in the second air flow path system. The control unit switches between the second air flow path system switching unit and the second heat medium flow path system so that the differential pressure detected by the second differential pressure detection unit does not exceed a predetermined pressure loss. The unit and the second heat medium pump may be controlled.

The control unit controls the second air flow path system switching unit and the second heat medium flow path system switching unit so that the usage time is made uniform among the plurality of first heat exchangers. You may.

A second aspect of the present invention is a compressor mechanically connected to an electric motor to compress air, a pressure accumulator for storing compressed air generated by the compressor, and the compression supplied from the accumulator. A plurality of expanders driven by air and mechanically connected to a generator, and a plurality of units that exchange heat with the compressed air generated by the compressor and a heat medium to lower the temperature of the compressed air. A first heat exchanger, a high-temperature heat storage unit that stores the heat medium heated by the heat exchange in the first heat exchanger, and a high-temperature heat storage unit that is connected in parallel to the one expander and from the pressure storage unit A plurality of second heat exchangers that exchange heat between the compressed air supplied to the expander and the heat medium supplied from the high temperature heat storage unit to raise the temperature of the compressed air, and the second heat exchanger. The low-temperature heat storage unit that stores the heat medium cooled by the heat exchange in the heat exchanger and the air inlets of the plurality of second heat exchangers are fluidly connected to the pressure storage unit, and the plurality of units are connected. The compressed air flows through the first air flow path system that fluidly connects the air outlet of the second heat exchanger to the air supply port of the one expander, and the individual second heat exchangers. A first air flow path system switching unit capable of switching the first air flow path system and a plurality of units so as to be set to either a state or a state in which the flow of the compressed air is cut off. The first heat that fluidly connects the heat medium inlets of the two heat exchangers to the high temperature heat storage section and fluidly connects the heat medium outlets of the plurality of second heat exchangers to the low temperature heat storage section. A medium flow path system, a first heat medium pump provided in the first heat medium flow path system and sending the heat medium from the high temperature heat storage unit to the low temperature heat storage unit, and individual second heat exchangers. The heat medium flows from the high temperature heat storage section to the low temperature heat storage section, and the heat medium flows from the high temperature heat storage section to the low temperature heat storage section. A compressed air storage power generation device including the first heat medium flow path system switching unit capable of switching the first heat medium flow path system is prepared, and at least based on the comparison of the generated power required value with the generated power rated value. At least the first air flow path system switching unit and the first heat medium flow path system switching unit are controlled, and at the time of partial load power generation in which the generated power required value is less than the generated power rated value, the plurality of the above. One or more of the second heat exchangers are set so that the flow of the air is cut off and the flow of the heat medium from the high temperature heat storage unit to the low temperature heat storage unit is cut off. In addition, the first air flow path system switching unit and the first heat medium flow path system switching unit Provide a controlled, compressed air storage power generation method.

According to the present invention, it is possible to suppress a decrease in efficiency of heat recovery and heat utilization by a heat medium during partial load operation.

The schematic block diagram of the compressed air storage power generation apparatus which concerns on 1st Embodiment of this invention. A flowchart for explaining control during charging operation. A flowchart for explaining alternative control during charging operation. The schematic block diagram which shows the setting of the open / closed state of a valve at the time of a charging operation. A flowchart for explaining control during power generation operation. A flowchart for explaining alternative control during power generation operation. The schematic block diagram which shows the setting of the open / closed state of a valve at the time of power generation operation. The schematic block diagram of the compressed air storage power generation apparatus which concerns on 2nd Embodiment of this invention. The schematic block diagram of the compressed air storage power generation apparatus which concerns on 3rd Embodiment of this invention. The schematic block diagram of the compressed air storage power generation apparatus which concerns on 4th Embodiment of this invention. The schematic block diagram which shows the setting of the open / closed state of a valve at the time of a charging operation. The schematic block diagram which shows the setting of the open / closed state of a valve at the time of power generation operation. The schematic block diagram of the compressed air storage power generation apparatus which concerns on 5th Embodiment of this invention. The schematic block diagram of the compressed air storage power generation apparatus which concerns on 6th Embodiment of this invention.

(First Embodiment)
The compressed air energy storage (CAES) power generation device 1 according to the first embodiment of the present invention shown in FIG. 1 equalizes the output fluctuation of the power generation device (not shown) that generates power by using renewable energy. In addition to supplying power to the power system, it also supplies power to the power system in accordance with fluctuations in power demand.

The CAES power generation device 1 of the present embodiment includes an air flow path system 2 and a heat medium flow path system 3.

(Air flow path system)
The air flow path system 2 includes two systems of air flow path systems 2A and 2B.

One air flow path system 2A (second air flow path system) is provided with a compressor 10, a plurality of air coolers 4 (first heat exchangers), and a pressure accumulator tank (accumulation unit) 5.

An electric motor 6 is mechanically connected to the compressor 10. The electric motor 6 is driven by fluctuating input power from a power generator (not shown) that generates electricity from renewable energies such as wind power, sunlight, solar heat, and wave power. The electric motor 6 may be supplied with power from the electric power system. The compressor 10 of this embodiment is a screw type. Since the screw type compressor 10 can control the rotation speed, it can follow the irregularly fluctuating input power with good responsiveness, and is preferable as a component of the CAES power generation device 1. The compressor 10 may be a compressor 10 other than a screw type such as a scroll type, a turbo type, or a reciprocating type.

In the air flow path system 2A, an air flow path 21 that fluidly connects the air inlets 4a of the plurality of air coolers 4 to the discharge ports 10b of the compressor 10 and the air outlets 4b of the plurality of air coolers 4 are accumulating tanks. Each of 5 is provided with an air flow path 22 that is fluidly connected. That is, in the air flow path system 2A, a plurality of air coolers 4 are provided in parallel between the compressor 10 and the accumulator tank 5.

Valves V1 that can be opened and closed by a control device 14 described later are provided at locations connected to the air outlets 4b of the individual air coolers 4 of the air flow path 22. When one valve V1 is open, the corresponding air cooler 4 is in a state in which compressed air from the compressor 10 flows. When one valve V1 is closed, the corresponding air cooler 4 is in a state where the flow of compressed air from the compressor 10 is cut off. That is, each air cooler 4 is used to cool the compressed air from the compressor 10 when the corresponding valve V1 is open, but when the corresponding valve V1 is closed. It is not used to cool the compressed air from the compressor 10. The valve V1 constitutes the second air flow path system switching portion in the present invention.

The other air flow path system 2B (first air flow path system) is provided with an expander 7, a plurality of air heaters (second heat exchangers) 8, and an accumulator tank 5.

A generator 9 is mechanically connected to the expander 7. The generator 9 is electrically connected to a power system (not shown). The expander 7 of the present embodiment is a screw type. The screw type expander 7 is preferable as a component of the CAES power generation device 1 in that the rotation speed can be controlled. The inflator 7 may be a non-screw type such as a scroll type, a turbo type, or a reciprocating type.

In the air flow path system 2B, the air flow path 23 for fluidly connecting the air inlets 8a of the plurality of air heaters 8 to the accumulator tank 5 and the air outlets 8b of the plurality of air heaters 8 are the air supply ports of the expander 7. An air flow path 24 that is fluidly connected to each of the 7a is provided.

Valves V2 that can be opened and closed by a control device 14 described later are provided at locations connected to the air outlets 8b of the individual air heaters 8 of the air flow path 24. When one valve V2 is open, the corresponding air heater 8 is in a state in which compressed air from the accumulator tank 5 flows. When one valve V2 is closed, the corresponding air heater 8 is in a state where the flow of compressed air from the accumulator tank 5 is cut off. That is, each air heater 8 is used to heat compressed air from the accumulator tank 5 when the corresponding valve V2 is open, but the corresponding valve V2 is closed. Not used to heat compressed air from tank 5. The valve V2 constitutes the first air flow path system switching portion in the present invention.

(Heat medium flow path system)
The heat medium flow path system 3 includes two heat medium flow path systems 3A and 3B.

One heat medium flow path system 3A (second heat medium flow path system) includes a low temperature heat medium tank 12 (low temperature heat storage section), a plurality of air coolers 4, and a high temperature heat medium tank 11 (high temperature heat storage section). It is provided.

The heat medium flow path system 3A has a heat medium flow path 31 that fluidly connects the heat medium inlets 4c of a plurality of air coolers 4 to the low temperature heat medium tank 12, and a heat medium outlet 4d of the plurality of air coolers 4. A heat medium flow path 32 that is fluidly connected to the high temperature heat medium tank 11 is provided. That is, in the heat medium flow path system 3A, a plurality of air coolers 4 are provided in parallel between the low temperature heat medium tank 12 and the high temperature heat medium tank 11. The heat medium flow path 31 is provided with a heat medium pump 13A (second heat medium pump) for sending a heat medium from the low temperature heat medium tank 12 to the high temperature heat medium tank 11 via the air cooler 4. There is.

Valves V3 that can be opened and closed by a control device 14 described later are provided at locations connected to the heat medium inlets 4c of the individual air coolers 4 of the heat medium flow path 31. When one valve V3 is open, the corresponding air cooler 4 is in a state in which the heat medium from the low temperature heat medium tank 12 flows. When one valve V3 is closed, the corresponding air cooler 4 is in a state where the flow of the heat medium from the low temperature heat medium tank 12 to the high temperature heat medium tank 11 is blocked (heat medium to the heat medium inlet 4c). There is no inflow of heat medium and no outflow of heat medium from the heat medium outlet 4d). That is, in each air cooler 4, the heat medium flows when the corresponding valve V3 is open, but the heat medium does not flow when the corresponding valve V3 is closed. The valve V3 constitutes the second heat medium flow path system switching unit in the present invention.

The other heat medium flow path system 3B (first heat medium flow path system) is provided with a high temperature heat medium tank 11, a plurality of air heaters 8, and a low temperature heat medium tank 12.

The heat medium flow path system 3B includes a heat medium flow path 33 that fluidly connects the heat medium inlets 8c of the plurality of air heaters 8 to the high temperature heat medium tank 11, and the heat medium outlets 8d of the plurality of air heaters 8. Is provided with a heat medium flow path 34, which is fluidly connected to the low temperature heat medium tank 12. That is, in the heat medium flow path system 3B, a plurality of air heaters 8 are provided in parallel between the high temperature heat medium tank 11 and the low temperature heat medium tank 12. The heat medium flow path 33 is provided with a heat medium pump 13B (first heat medium pump) for sending a heat medium from the high temperature heat medium tank 11 to the low temperature heat medium tank 12 via the air heater 8. There is.

Valves V4 that can be opened and closed by a control device 14 described later are provided at locations connected to the heat medium inlets 8c of the individual air heaters 8 of the heat medium flow path 33. When one valve V4 is open, the corresponding air heater 8 is in a state in which the heat medium from the high temperature heat medium tank 11 flows. When one valve V4 is closed, the corresponding air heater 8 is in a state where the flow of the heat medium from the high temperature heat medium tank 11 to the low temperature heat medium tank 12 is blocked (heat medium to the heat medium inlet 8c). There is no inflow of heat medium and no outflow of heat medium from the heat medium outlet 8d). That is, in each air heater 8, the heat medium flows when the corresponding valve V4 is open, but the heat medium does not flow when the corresponding valve V4 is closed. The valve V4 constitutes the first heat medium flow path system switching unit in the present invention.

(Control device)
The control device 14 (control unit) is based on a charging request (including a charging power request value) input from the outside of the CAES power generation device 1 and a power generation request (including a generated power request value), and the CAES power generation device 1 Controls various components of the system in an integrated manner. Such elements include an electric motor 6 for driving the compressor 10, heat medium pumps 13A and 13B, and valves V1 to V4. The control device 14 can be constructed by hardware including a storage device such as a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory), and software mounted therein.

(Charging operation)
FIG. 2 shows an outline of control during charging operation. During the charging operation, the number of air coolers 4 is controlled based on the comparison of the required charging power value with respect to the rated charging power value.

In step S21, the control device 14 confirms the required charging power value. Subsequently, in step S22, the control device 14 executes the control of the number of air coolers based on the data of the number of air coolers used for each charging power required value stored in advance. Specifically, if the required charging power value is less than the rated charging power value, not all the air coolers 4 are used, but one or more air coolers 4 are not used, and the remaining air coolers 4 are not used. The heat exchange between the compressed air and the heat medium from the compressor 10 is performed. As the charge power demand value smaller against the charging power rated value, reducing the number of air cooler 4 to be used for heat exchange. If the required charging power value is equal to or higher than the rated charging power value, all the air coolers 4 are used.

During the charging operation, the heat medium pump 13A operates and the heat medium pump 13B does not operate. In the present embodiment, the smaller the number of air coolers 4 used for heat exchange during partial load charging, the smaller the flow rate of the heat medium delivered by the heat medium pump 13A.

With reference to FIG. 4, for the air cooler 4 (one in this example) that is not used for heat exchange, the valves V1 and V3 are set to be closed. That is, for the air cooler 4 which is not used for heat exchange, the flow of compressed air from the compressor 10 is blocked, and the flow of the heat medium from the low temperature heat medium tank 12 to the high temperature heat medium tank 11 is blocked ( There is no inflow of the heat medium into the heat medium inlet 4c and no outflow of the heat medium from the heat medium outlet 4d). For the air cooler 4 used for heat exchange, the valves V1 and V3 are set to open.

During the charging operation, the electric motor 6 is driven by the fluctuating electric power input from the power generation device, and the compressor 10 is driven by the electric motor 6. The compressor 10 sucks air from the suction port 10a and compresses it to generate compressed air. The compressed air discharged from the discharge port 10b of the compressor 10 is pressure-fed to the accumulator tank 5 through the air flow path system 2A and stored in the accumulator tank 5. That is, the accumulator tank 5 stores compressed air and stores it as energy. The compressed air passes through the air cooler 4 (valves V1 and V3 are set to open) used for heat exchange before being pumped to the accumulator tank 5, but is not used for heat exchange. Valves V1 and V3 are set to closed) do not pass.

During the charging operation, the heat medium pump 13A sends the heat medium stored in the low temperature heat medium tank 12 to the high temperature heat medium tank 11 through the heat medium flow path system 3A. The heat medium passes through the air cooler 4 used for heat exchange (valves V1 and V3 are set to open) before being sent to the high temperature heat medium tank 11, but is not used for heat exchange. (Valves V1 and V3 are set to closed) do not pass.

The compressed air discharged from the discharge port 10b of the compressor 10 has a high temperature due to the heat of compression generated during compression. In the air cooler 4 used for heat exchange, the compressed air is cooled and the heat medium is heated by heat exchange between the heat medium and the compressed air. Therefore, the compressed air cooled by heat exchange is stored in the accumulator tank 5. Further, the high temperature heat medium tank 11 stores the heated heat medium after heat exchange.

If the flow rate sent by the heat medium pump 13A is simply reduced during partial load charging and the number of air coolers 4 is not controlled, the flow velocity of the heat medium flowing through the individual air coolers 4 will decrease. .. A decrease in the flow velocity of the heat medium flowing through the air cooler 4 causes a decrease in heat exchange performance. In the present embodiment, heat exchange is performed by controlling the number of air coolers 4 during partial load charging and reducing the flow rate sent by the heat medium pump 13A according to the number of air coolers 4 used for heat exchange. The flow rate of the heat medium flowing from the low temperature heat medium tank 12 to the high temperature heat medium tank 11 can be reduced while suppressing a decrease in the flow velocity of the heat medium in the air cooler 4 used for the above.

By suppressing the decrease in the flow velocity of the heat medium in the air cooler 4 used for heat exchange during partial load charging, it is possible to suppress the decrease in the heat exchange performance of the air cooler 4 due to the decrease in the flow rate of the heat medium. Further, by reducing the flow rate of the heat medium flowing from the low temperature heat medium tank 12 to the high temperature heat medium tank 11 during partial load charging, it is possible to avoid insufficient temperature rise of the heat medium flowing into the high temperature heat medium tank 11, which is high. It is possible to prevent the temperature of the heat medium in the heat medium tank 11 from deviating from the target value to the low temperature side. Therefore, it is not necessary to raise the temperature of the heat medium flowing into the high temperature heat medium tank 11 by the auxiliary heater. From the above, it is possible to suppress a decrease in the efficiency of heat recovery in the heat medium during partial load power generation, and suppress a decrease in the amount of charging power and the system efficiency.

Since the amount of heat medium used for partial load charging can be saved, it is not necessary to set the low temperature heat medium tank 12 and the high temperature heat medium tank 11 to large capacities, and a long charging operation time is secured without being limited by the amount of heat medium. it can.

Which of the plurality of air coolers 4 is not used for heat exchange during partial load charging is selected so that the usage time is made uniform among the plurality of air coolers 4. For example, the control device 14 stores the usage time of each air cooler 4, and at the time of partial load charging, the air cooler 4 having a long usage time up to that point is preferentially selected as the air cooler 4 not used for heat exchange.

FIG. 3 shows an outline of control of an alternative during charging operation. In step S31, the control device 14 confirms the required charging power value. Subsequently, in step S32, the control device 14 calculates the ratio α of the required charging power value to the rated charging power value. Further, in step S33, the control device 14 determines the number of air coolers used Na based on the product α * N1 of the ratio α and the number of installed air coolers N1 (total number of air coolers 4 included in the CAES device 1) stored in advance. decide. In step S34, the number of air coolers 4 and the flow rate of the heat medium pump 13A are controlled based on the number of Na air coolers used.

For example, consider a case where the rated charging power rating value is 100 and the actual charging power required value is 50. In this case, the ratio α is 0.5 (50%), and the number of air coolers used Na is set to 0.5N1 (α * N1). However, 0.5N1 is if not an integer, to avoid performance degradation heat medium flow rate by. Doing so less than the rated, set the first integer greater than or equal 0.5N1 air cooler use number Na. Specifically, if the number of air coolers installed N1 is three and the ratio α is 0.5, the number of air coolers used Na is two.

(Power generation operation)
FIG. 5 shows an outline of control during power generation operation. During the power generation operation, the number of air heaters 8 is controlled based on the comparison of the required power generation value with respect to the rated power generation value.

In step S51, the control device 14 confirms the required power generation value. Subsequently, in step S52, the control device 14 executes the control of the number of air heaters based on the data of the number of air heaters used for each power generation demand value stored in advance. Specifically, if the required power generation value is less than the rated power generation power value, not all the air heaters 8 are used, but one or a plurality of air heaters 8 are not used, and the remaining one or the remaining one or a plurality of air heaters 8 are not used. A plurality of air heaters 8 perform heat exchange between the compressed air from the accumulator tank 5 and the heat medium. As generated power demand value is smaller against the generated power rated value, reducing the number of air heater 8 to be used for heat exchange. If the required power generation value is equal to or higher than the rated power generation value, all the air heaters 8 are used.

During the power generation operation, the heat medium pump 13B operates and the heat medium pump 13A does not operate. In the present embodiment, the smaller the number of air heaters 8 used for heat exchange during partial load power generation, the smaller the flow rate of the heat medium delivered by the heat medium pump 13B.

With reference to FIG. 7, for the air heater 8 (one in this example) that is not used for heat exchange, the valves V2 and V4 are set to be closed. That is, for the air heater 8 which is not used for heat exchange, the flow of compressed air from the accumulator tank 5 is blocked, and the flow of the heat medium from the high temperature heat medium tank 11 to the low temperature heat medium tank 12 is blocked ( There is no inflow of the heat medium into the heat medium inlet 8c and no outflow of the heat medium from the heat medium outlet 8d). For the air heater 8 used for heat exchange, the valves V2 and V4 are set to open.

During the power generation operation, the compressed air sent out from the accumulator tank 5 is supplied to the air supply port 7a of the expander 7 through the air flow path system 2B . The expander 7 is operated by the compressed air supplied to the air supply port 7a, and the generator 9 is double-operated. The electric power generated by the generator 9 is supplied to the electric power system (not shown). The air expanded by the inflator 7 is discharged from the exhaust port 7b. The compressed air passes through the air heater 8 (valves V2 and V4 are set to open) used for heat exchange before being supplied to the expander 7, but is not used for heat exchange. Valves V2 and V4 are set to closed) do not pass.

During the power generation operation, the heat medium pump 13B sends the heat medium stored in the high temperature heat medium tank 11 to the low temperature heat medium tank 12 through the heat medium flow path system 3B. The heat medium passes through the air heater 8 used for heat exchange (valves V2 and V4 are set to open) before being sent to the low temperature heat medium tank 12, but the air heater 8 is not used for heat exchange. (Valves V2 and V4 are set to closed) do not pass.

In the expander 7, the temperature of the air drops due to endothermic heat during expansion. Therefore, the compressed air supplied to the expander 7 is preferably at a high temperature. In the air heater 8 used for heat exchange, the compressed air is heated and the heat medium is cooled by heat exchange between the heat medium and the compressed air. Therefore, compressed air whose temperature has been raised by heat exchange is supplied to the expander 7. Further, the low temperature heat medium tank 12 stores the cooled heat medium after heat exchange.

If the flow rate sent by the heat medium pump 13B is simply reduced during partial load power generation and the number of air heaters 8 is not controlled, the flow velocity of the heat medium flowing through the individual air heaters 8 will decrease. .. A decrease in the flow velocity of the heat medium flowing through the air heater 8 causes a decrease in heat exchange performance. In the present embodiment, heat exchange is performed by controlling the number of air heaters 8 during partial load power generation and reducing the flow rate sent by the heat medium pump 13B according to the number of air heaters 8 used for heat exchange. The flow rate of the heat medium flowing from the high temperature heat medium tank 11 to the low temperature heat medium tank 12 can be reduced while suppressing a decrease in the flow velocity of the heat medium in the air heater 8 used for the above.

By suppressing a decrease in the flow velocity of the heat medium in the air heater 8 used for heat exchange during partial load power generation, it is possible to suppress a decrease in the heat exchange performance of the air heater 8 due to the decrease in the flow velocity of the heat medium. Further, by reducing the flow rate of the heat medium flowing from the high temperature heat medium tank 11 to the low temperature heat medium tank 12 during partial load power generation, it is possible to avoid insufficient temperature drop of the heat medium flowing into the low temperature heat medium tank 12, and the temperature is low. It is possible to prevent the temperature of the heat medium in the heat medium tank 12 from deviating from the target value to the high temperature side. Therefore, it is not necessary to lower the temperature of the heat medium flowing into the low temperature heat medium tank 12 by an auxiliary cooler other than the air heater 8. From the above, it is possible to suppress a decrease in the efficiency of heat utilization in the heat medium during partial load power generation, and suppress a decrease in the amount of generated power and the system efficiency.

Since the amount of heat medium used during partial load power generation can be saved, it is not necessary to set the low temperature heat medium tank 12 and the high temperature heat medium tank 11 to large capacities, and a long power generation operation time is secured without being limited by the amount of heat medium. it can.

Which of the plurality of air heaters 8 is not used for heat exchange during partial load power generation is selected so that the usage time is made uniform among the plurality of air heaters 8. For example, the control device 14 stores the usage time of each air heater 8, and at the time of partial load power generation, the air heater 8 having a long usage time up to that point is preferentially selected as the air heater 8 not used for heat exchange.

FIG. 6 shows an outline of alternative control during power generation operation. In step S61, the control device 14 confirms the required power generation value. Subsequently, in step S62, the control device 14 calculates the ratio β of the generated power required value to the generated power rated value. Further, in step S63, the control device 14 determines the number of air heaters used Nb based on the product β * N2 of the ratio β and the number of installed air heaters N2 (total number of air heaters 8 included in the CAES device 1) stored in advance. decide. In step S64, the number of air heaters 8 and the flow rate of the heat medium pump 13B are controlled based on the number of air heaters used Nb .

For example, consider a case where the rated value of the generated power is 100 and the actual required value of the generated power is 50. In this case, the ratio β is 0.5 (50%), and the number of air heaters used Nb is set to 0.5N2 (β * N2). However, 0.5N2 is if not an integer, to avoid performance degradation heat medium flow rate by. Doing so less than the rated, set the first integer greater than or equal 0.5N2 air heater using the number Nb. Specifically, if the number of air heaters installed N2 is 3 and the ratio β is 0.5, the number of air heaters used Nb is 2.

The arrangement of valves V1 to V4 in this embodiment is not limited to that shown in FIG. Specifically, the valve V1 may be provided on the air inlet 4a side of the air cooler 4, or may be provided on both the air inlet 4a side and the air outlet 4b side. The valve V2 may be provided on the air inlet 8a side of the air heater 8, or may be provided on both the air inlet 8a side and the air outlet 8b side. The valve V3 may be provided on the heat medium outlet 4d side of the air cooler 4, or may be provided on both the heat medium inlet 4c and the heat medium outlet 4d. The valve V4 may be provided on the heat medium outlet 8d side of the air heater 8, or may be provided on both the heat medium inlet 8c side and the heat medium outlet 8d side.

The following second to sixth embodiments are the same as those of the first embodiment without particular mention. Further, in the drawings relating to these embodiments, the same or similar elements as those in the first embodiment are designated by the same reference numerals.

(Second Embodiment)
The CAES power generation device 1 according to the second embodiment of the present invention shown in FIG. 8 includes a temperature sensor 15A (second temperature detection unit) for detecting the temperature of the heat medium in the high temperature heat medium tank 11 and a low temperature heat medium tank 12. It is provided with a temperature sensor 15B (first temperature detection unit) that detects the temperature of the heat medium inside.

The control device 14 considers the detected temperature of the temperature sensor 15A in the number control during the charging operation and the flow rate control of the heat medium pump 13A (step S22 in FIG. 2 and step S34 in FIG. 3). Specifically, the control device 14 determines the number of air coolers 4 used for heat exchange and the flow rate of the heat medium pump 13A so that the detection temperature of the temperature sensor 15A becomes equal to or higher than a predetermined set temperature.

Further, the control device 14 considers the detected temperature of the temperature sensor 15B in the number control during the power generation operation and the flow rate control of the heat medium pump 13B (step S52 in FIG. 5 and step S64 in FIG. 6). Specifically, the control device 14 determines the number of air heaters 8 used for heat exchange and the flow rate of the heat medium pump 13B so that the detection temperature of the temperature sensor 15B becomes equal to or lower than a predetermined set temperature.

(Third Embodiment)
The CAES power generation device 1 according to the third embodiment of the present invention shown in FIG. 9 is a differential pressure sensor that detects the differential pressure between the air inlet 4a side and the air outlet 4b side of a plurality of air coolers 4 in the air flow path system 2A. 16A comprises a (second differential pressure detecting unit). Further, the CAES device 1 according to the present embodiment is a differential pressure sensor 16B (first differential pressure detection) that detects the differential pressure between the air inlet 8a side and the air outlet 8b side of a plurality of air heaters 8 in the air flow path system 2B. Part ).

The control device 14 considers the differential pressure detected by the differential pressure sensor 16A in the number control during the charging operation (step S22 in FIG. 2 and step S34 in FIG. 3). Specifically, the control device 14 determines the number of air coolers 4 used for heat exchange so that the differential pressure detected by the differential pressure sensor 16A does not exceed a predetermined pressure loss.

The control device 14 considers the differential pressure detected by the differential pressure sensor 16B in the number control (step S52 in FIG. 5 and step S64 in FIG. 6) during the power generation operation. Specifically, the control device 14 determines the number of air heaters 8 used for heat exchange so that the differential pressure detected by the differential pressure sensor 16B does not exceed a predetermined pressure loss.

(Fourth Embodiment)
FIG. 10 shows the CAES power generation device 1 according to the fourth embodiment of the present invention. In the present embodiment, the valve V3 is provided at a position connected to the heat medium outlets 4d of the individual plurality of air coolers 4 in the heat medium flow path system 32.

The heat medium flow path system 3A in the present embodiment includes a heat medium return flow path 41 that fluidly connects the heat medium outlets 4d of a plurality of individual air coolers 4 and the low temperature heat medium tank 12. The heat medium return flow path 41 has a portion branched from the heat medium flow path 32 between the heat medium outlet 4d of each air cooler 4 and the valve V3, and the valve V5 is provided in each of these portions. Has been done. The valve V5 can be opened and closed by the control device 14. The heat medium return flow path 41, at a location between the low-temperature heat medium tank 12 and a valve V4, and joined to Netsunakadachiryu path 3 3.

The heat medium flow path system 3B in the present embodiment includes a heat medium return flow path 42 that fluidly connects the heat medium outlets 8d of each of a plurality of air heaters 8 and the high temperature heat medium tank 11. The heat medium return flow path 42 has a portion branched from the heat medium flow path 33 between the heat medium outlet 4d of each air heater 8 and the valve V4, and the valve V6 is provided in each of these portions. Has been done. The valve V6 can be opened and closed by the control device 14. The heat medium return flow path 42, at a location between the high temperature heat medium tank 11 and a valve V3, which joins the Netsunakadachiryu passage 3 2.

With reference to FIG. 11, the valves V1 and V3 of the air cooler 4 used for heat exchange during the partial load charging operation are opened and the valves V5 are closed. On the other hand, for the air cooler 4 that is not used for heat exchange during the partial load charging operation, the valves V1 and V3 are closed and the valves V5 are opened. Due to the opening / closing settings of the valves V1, V3, and V5, a heat medium circulation path including the heat medium return flow path 41 is provided between the air cooler 4 not used for heat exchange and the low temperature heat medium tank 12 during partial load charging. It is formed.

In the first embodiment, since the heat medium does not flow into the air cooler 4 that is not used for heat exchange during partial load charging, the air cooler 4 that is not used for heat exchange dissipates heat due to the difference from the outside air temperature and becomes the internal heat medium. The heat exchange wall temperature drops. When returning to the operating state in this state, the temperature of the heat medium is lowered and the viscosity is increased, causing a drift due to deterioration of fluidity, and the predetermined air and heat medium temperatures cannot be obtained. Since it sometimes takes several tens of minutes to resolve this state, sufficient charging performance cannot be obtained during the warm-up time, resulting in a decrease in energy efficiency. On the other hand, in the present embodiment, the temperature drop can be prevented by continuing to flow the heat medium to the air cooler 4 which is not used for heat exchange.

Since the heat medium flowing out of the air cooler 4 not used for heat exchange is hardly heated, the heat medium temperature of the high temperature heat medium tank 11 is targeted when mixed with the heat medium flowing out from the air cooler 4 used for heat exchange. It will deviate from the value to the low temperature side. In the present embodiment, the heat medium flowing out of the air cooler 4 not used for heat exchange is returned to the low temperature heat medium tank 12, that is, a tank different from the air cooler 4 used for heat exchange, instead of the high temperature heat medium tank 11, so that the temperature is low. It is possible to prevent the heat medium temperature of the high temperature heat medium tank 11 from deviating from the target value to the low temperature side while suppressing a decrease in the heat medium storage amount of the heat medium tank 12.

With reference to FIG. 12, the valves V2 and V4 of the air heater 8 used for heat exchange during the partial load power generation operation are opened and the valves V6 are closed. On the other hand, for the air heater 8 that is not used for heat exchange during the partial load power generation operation, the valves V2 and V4 are closed and the valves V6 are opened. Due to the opening / closing settings of the valves V2, V4, and V6, a heat medium circulation path including the heat medium return flow path 42 is established between the air heater 8 not used for heat exchange and the high temperature heat medium tank 11 during partial load power generation. It is formed.

In the first embodiment, since the heat medium does not flow into the air heater 8 that is not used for heat exchange during partial load power generation, the air heater 8 that is not used for heat exchange dissipates heat due to the difference from the outside air temperature, and is combined with the internal heat medium. The heat exchange wall temperature drops. When returning to the operating state in this state, the temperature of the heat medium is lowered and the viscosity is increased, causing a drift due to deterioration of fluidity, and the predetermined air and heat medium temperatures cannot be obtained. Since it sometimes takes several tens of minutes to resolve this state, sufficient charging performance cannot be obtained during the warm-up time, resulting in a decrease in energy efficiency. On the other hand, in the present embodiment, the temperature drop can be prevented by continuing to flow the heat medium to the air heater 8 which is not used for heat exchange.

Since the heat medium flowing out from the air heater 8 not used for heat exchange is hardly cooled, the heat medium temperature of the low temperature heat medium tank 12 is the target when mixed with the heat medium flowing out from the air heater 8 used for heat exchange. It will deviate from the value to the high temperature side. In the present embodiment, the heat medium flowing out from the air heater 8 not used for heat exchange is returned to the high temperature heat medium tank 11 instead of the low temperature heat medium tank 12, that is, a tank different from the air heater 8 used for heat exchange. It is possible to prevent the heat medium temperature of the low temperature heat medium tank 12 from deviating from the target value to the high temperature side while suppressing a decrease in the heat medium storage amount of the hot heat medium tank 11.

(Fifth Embodiment)
The CAES apparatus 1 according to the fifth embodiment of the present invention shown in FIG. 13 has a temperature sensor 15A for detecting the heat medium temperature in the high temperature heat medium tank 11 and a temperature for detecting the heat medium temperature in the low temperature heat medium tank 12. The point that the sensor 15B is provided is different from the fourth embodiment.

Similar to the second embodiment, the detection temperature of the temperature sensor 15A is also considered in the control of the number of air coolers 4 during the charging operation, and the detection temperature of the temperature sensor 15B is also considered in the control of the number of air heaters 8 during the power generation operation. ..

(Sixth Embodiment)
The CAES power generation device 1 according to the sixth embodiment of the present invention shown in FIG. 14 is different from the fourth embodiment in that the differential pressure sensors 16A and 16B are provided. The differential pressure sensor 16A detects the differential pressure between the air inlet 4a side and the air outlet 4b side of a plurality of air coolers 4 in the air flow path system 2A. The differential pressure sensor 16B detects the differential pressure between the air inlet 8a side and the air outlet 8b side of the plurality of air heaters 8 in the air flow path system 2B.

Similar to the third embodiment, the differential pressure detected by the differential pressure sensor 16A is also taken into consideration in the control of the number of air coolers 4 during the charging operation, and is detected by the differential pressure sensor 16B in the control of the number of air heaters 8 during the power generation operation. The differential pressure applied is also taken into account.

1 Compressed air storage power generation device 2 Air flow path system 2A Air flow path system (second air flow path system)
2B air flow path system (first air flow path system)
3 Heat medium flow path system 3A Heat medium flow path system (second heat medium flow path system)
3B heat medium flow path system (first heat medium flow path system)
4 Air cooler (1st heat exchanger)
4a Air inlet 4b Air outlet 4c Heat medium inlet 4d Heat medium outlet 5 Accumulation tank (accumulation part)
6 Electric motor 7 Expander 7a Air supply port 7b Exhaust port 8 Air heater (second heat exchanger)
8a Air inlet 8b Air outlet 8c Heat medium inlet 8d Heat medium outlet 9 Generator 10 Compressor 10a Suction port 10b Discharge port 11 High temperature heat medium tank (high temperature heat storage unit)
12 Low temperature heat medium tank (low temperature heat storage unit)
13A heat medium pump (second heat medium pump)
13B heat medium pump (first heat medium pump)
14 controller 15A temperature sensor (second temperature detector)
15B temperature sensor (first temperature detector)
16A differential pressure sensor (second differential pressure detecting unit)
16B differential pressure sensor ( first differential pressure detector)
21, 22, 23, 24 Air flow path 31, 32, 33, 34 Heat medium flow path 41, 42 Heat medium return flow path

Claims (14)

A compressor that is mechanically connected to an electric motor and compresses air,
A pressure accumulator that stores the compressed air generated by the compressor,
An expander driven by the compressed air supplied from the accumulator and mechanically connected to the generator.
A plurality of first heat exchangers that exchange heat between the compressed air generated by the compressor and a heat medium to lower the temperature of the compressed air.
A high-temperature heat storage unit that stores the heat medium that has been heated by the heat exchange in the first heat exchanger, and
The compressed air connected in parallel to the one expander and supplied from the accumulator to the expander exchanges heat with the heat medium supplied from the high temperature heat storage unit to raise the compressed air. With multiple second heat exchangers to heat,
A low-temperature heat storage unit that stores the heat medium cooled by the heat exchange in the second heat exchanger, and
The air inlets of the plurality of second heat exchangers are fluidly connected to the accumulator, and the air outlets of the plurality of second heat exchangers are connected to the air supply ports of the one expander, respectively. The first air flow path system that connects fluidly,
The first air flow path system can be switched so that each of the second heat exchangers is set to either a state in which the compressed air flows or a state in which the flow of the compressed air is blocked. The first air flow path system switching unit and
The heat medium inlets of the plurality of second heat exchangers are fluidly connected to the high temperature heat storage section, and the heat medium outlets of the plurality of second heat exchangers are fluidly connected to the low temperature heat storage section. The first heat medium flow path system to be connected and
A first heat medium pump provided in the first heat medium flow path system and sending the heat medium from the high temperature heat storage unit to the low temperature heat storage unit.
Each of the second heat exchangers has a state in which the heat medium flows from the high temperature heat storage unit to the low temperature heat storage unit and a state in which the flow of the heat medium from the high temperature heat storage unit to the low temperature heat storage unit is blocked. A first heat medium flow path system switching unit capable of switching the first heat medium flow path system so as to be set to any of
Based at least on a comparison to the generator power rating of the power generation demand value, Bei example a control unit for controlling at least said first air flow path system switching section and said first heating medium flow channel system switching section,
In the control unit, at the time of partial load power generation in which the generated power required value is less than the generated power rated value, one or more of the plurality of the second heat exchangers shut off the air flow. The first air flow path system switching section and the first heat medium flow path system switching are set so that the flow of the heat medium from the high temperature heat storage section to the low temperature heat storage section is cut off. A compressed air storage power generator that controls the unit. During the partial load power generation, the control unit shuts off the flow of air and stops the inflow and outflow of the heat medium for one or more of the plurality of second heat exchangers. As described above, the first air flow path system switching unit and the first heat medium flow path system switching unit are controlled.
The compressed air storage power generation device according to claim 1 , wherein the control unit reduces the flow rate of the heat medium delivered by the first heat medium pump during the partial load power generation. The first heat medium flow path system further includes a first heat medium return flow path that fluidly connects the heat medium outlets of the plurality of second heat exchangers and the high temperature heat storage unit.
The first heat medium flow path system switching unit can switch between communication and interruption between each of the plurality of second heat exchangers and the high temperature heat storage unit via the first heat medium return flow path.
At the time of the partial load power generation, the control unit cuts off the flow of air for one or more of the plurality of second heat exchangers, and the high temperature heat storage unit is transferred to the low temperature heat storage unit. The first air flow path system switching section and the said so that the flow of the heat medium is blocked and the heat medium flows from the heat medium outlet to the high temperature heat storage section via the first heat medium return flow path. controlling the first heating medium channel system switching section, the compressed air storage power generating apparatus according to claim 1. A first temperature detection unit for detecting the temperature of the heat medium in the low temperature heat storage unit is further provided.
In the control unit, the first air flow path system switching unit, the first heat medium flow path system switching unit, and the like so that the temperature detected by the first temperature detection unit is equal to or lower than a predetermined set temperature. The compressed air storage power generation device according to any one of claims 1 to 3 , which controls the first heat medium pump. A first differential pressure detecting unit for detecting the differential pressure between the air inlet side and the air outlet side of the plurality of second heat exchangers in the first air flow path system is further provided.
The control unit has the first air flow path system switching unit and the first heat medium flow path system switching unit so that the differential pressure detected by the first differential pressure detection unit does not exceed a predetermined pressure loss. The compressed air storage power generation device according to any one of claims 1 to 3 , which controls the first heat medium pump. The control unit controls the first air flow path system switching unit and the first heat medium flow path system switching unit so that the usage time is made uniform among the plurality of second heat exchangers. , The compressed air storage power generation device according to any one of claims 1 to 5 . The air inlets of the plurality of first heat exchangers are fluidly connected to the discharge ports of the compressor, and the air outlets of the plurality of first heat exchangers are fluidly connected to the accumulator. 2nd air flow path system and
The second air flow path system can be switched so that each of the first heat exchangers is set to either a state in which the compressed air flows or a state in which the flow of the compressed air is blocked. The second air flow path system switching unit and
The heat medium inlets of the plurality of first heat exchangers are fluidly connected to the low temperature heat storage section, and the heat medium outlets of the plurality of first heat exchangers are fluidly connected to the high temperature heat storage section. The second heat medium flow path system to be connected and
A second heat medium pump provided in the second heat medium flow path system and sending the heat medium from the low temperature heat storage unit to the high temperature heat storage unit.
Each of the first heat exchangers has a state in which the heat medium flows from the low temperature heat storage unit to the high temperature heat storage unit and a state in which the flow of the heat medium from the low temperature heat storage unit to the high temperature heat storage unit is blocked. A second heat medium flow path system switching unit capable of switching the second heat medium flow path system so as to be set to any of
With more
The control unit controls at least the second air flow path system switching unit and the second heat medium flow path system switching unit based on at least a comparison of the charging power required value with respect to the charged power rated value. The compressed air storage power generation device according to any one of claims 6 . In the control unit, at the time of partial load charging in which the charging power required value is less than the charging power rated value, one or more of the plurality of the first heat exchangers shut off the air flow. The second air flow path system switching section and the second heat medium flow path system switching are set so that the flow of the heat medium from the low temperature heat storage section to the high temperature heat storage section is blocked. The compressed air storage power generation device according to claim 7 , which controls a unit. During the partial load charging, the control unit shuts off the flow of air and stops the inflow and outflow of the heat medium for one or more of the plurality of first heat exchangers. As described above, the second air flow path system switching unit and the second heat medium flow path system switching unit are controlled.
The compressed air storage power generation device according to claim 8 , wherein the control unit reduces the flow rate of the heat medium delivered by the second heat medium pump during the partial load charging. The second heat medium flow path system further includes a second heat medium return flow path that fluidly connects the heat medium outlets of the plurality of first heat exchangers and the low temperature heat storage unit.
The second heat medium flow path system switching unit can switch between communication and interruption between the plurality of first heat exchangers and the low temperature heat storage unit via the second heat medium return flow path.
At the time of partial load charging, the control unit cuts off the flow of air for one or more of the plurality of first heat exchangers, and transfers the low temperature heat storage unit to the high temperature heat storage unit. The second air flow path system switching section and the said so that the flow of the heat medium is blocked and the heat medium flows from the heat medium outlet to the low temperature heat storage section via the second heat medium return flow path. The compressed air storage power generation device according to claim 8 , which controls a second heat medium flow path system switching unit. A second temperature detection unit for detecting the temperature of the heat medium in the high temperature heat storage unit is further provided.
The control unit includes the second air flow path system switching unit and the second heat medium flow path system switching unit so that the temperature detected by the second temperature detection unit becomes equal to or higher than a predetermined set temperature. The compressed air storage power generation device according to any one of claims 8 to 10 , which controls the second heat medium pump. A second differential pressure detecting unit for detecting the differential pressure between the air inlet side and the air outlet side of the plurality of first heat exchangers in the second air flow path system is further provided.
The control unit has the second air flow path system switching unit and the second heat medium flow path system switching unit so that the differential pressure detected by the second differential pressure detection unit does not exceed a predetermined pressure loss. The compressed air storage power generation device according to any one of claims 7 to 10 , which controls the second heat medium pump. The control unit controls the second air flow path system switching unit and the second heat medium flow path system switching unit so that the usage time is made uniform among the plurality of first heat exchangers. , The compressed air storage power generation device according to any one of claims 7 to 12 . A compressor that is mechanically connected to an electric motor and compresses air,
A pressure accumulator that stores the compressed air generated by the compressor,
An expander driven by the compressed air supplied from the accumulator and mechanically connected to the generator.
A plurality of first heat exchangers that exchange heat between the compressed air generated by the compressor and a heat medium to lower the temperature of the compressed air.
A high-temperature heat storage unit that stores the heat medium that has been heated by the heat exchange in the first heat exchanger, and
The compressed air connected in parallel to the one expander and supplied from the accumulator to the expander exchanges heat with the heat medium supplied from the high temperature heat storage unit to raise the compressed air. With multiple second heat exchangers to heat,
A low-temperature heat storage unit that stores the heat medium cooled by the heat exchange in the second heat exchanger, and
The air inlets of the plurality of second heat exchangers are fluidly connected to the accumulator, and the air outlets of the plurality of second heat exchangers are connected to the air supply ports of the one expander, respectively. The first air flow path system that connects fluidly,
The first air flow path system can be switched so that each of the second heat exchangers is set to either a state in which the compressed air flows or a state in which the flow of the compressed air is blocked. The first air flow path system switching unit and
The heat medium inlets of the plurality of second heat exchangers are fluidly connected to the high temperature heat storage section, and the heat medium outlets of the plurality of second heat exchangers are fluidly connected to the low temperature heat storage section. The first heat medium flow path system to be connected and
A first heat medium pump provided in the first heat medium flow path system and sending the heat medium from the high temperature heat storage unit to the low temperature heat storage unit.
Each of the second heat exchangers has a state in which the heat medium flows from the high temperature heat storage unit to the low temperature heat storage unit and a state in which the flow of the heat medium from the high temperature heat storage unit to the low temperature heat storage unit is blocked. A compressed air storage power generation device including a first heat medium flow path system switching unit capable of switching the first heat medium flow path system is prepared so as to be set to any of the above.
At least the first air flow path system switching unit and the first heat medium flow path system switching unit are controlled based on at least the comparison of the generated power required value with respect to the generated power rated value .
During partial load power generation in which the required power generation value is less than the rated power generation value, one or more of the plurality of second heat exchangers have the air flow blocked and the high temperature. The first air flow path system switching unit and the first heat medium flow path system switching unit are controlled so that the flow of the heat medium from the heat storage unit to the low temperature heat storage unit is set to be blocked. Compressed air storage power generation method.

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