阅读说明：本技术 压缩空气储能发电装置 (Compressed air energy storage power generation device ) 是由 久保洋平 松隈正树 松尾裕治 佐藤隆 中道亮 于 2018-03-15 设计创作，主要内容包括：具备：压缩机(6)、第1热交换器(7)、第1蓄热部(10)和蓄压部(5)、第2热交换器(9)、第2蓄热部(11)。将第1蓄热(10)部和第2蓄热部(10)用第1流路(24)以及第2流路(25)连接。将第1流路(24)和第2流路(25)用第3流路(26)连接。在第1流路(24)的第1区域设置第1开闭单元(29),在第2区域设置第2开闭单元(30)。在第2流路(25)的第3区域设置第3开闭单元(31),在第4区域设置第4开闭单元(32)。在第3流路(26)设置驱动单元(27)和加热单元(28)。(the disclosed device is provided with: a compressor (6), a 1 st heat exchanger (7), a 1 st heat storage part (10), a pressure storage part (5), a 2 nd heat exchanger (9), and a 2 nd heat storage part (11). The 1 st heat storage portion (10) and the 2 nd heat storage portion (10) are connected by a 1 st channel (24) and a 2 nd channel (25). The 1 st channel (24) and the 2 nd channel (25) are connected by a 3 rd channel (26). A1 st opening/closing means (29) is provided in the 1 st region of the 1 st channel (24), and a 2 nd opening/closing means (30) is provided in the 2 nd region. A3 rd opening/closing means (31) is provided in the 3 rd region of the 2 nd channel (25), and a 4 th opening/closing means (32) is provided in the 4 th region. A driving means (27) and a heating means (28) are provided in the 3 rd flow path (26).)

1. A compressed air energy-storage power generation device is characterized by comprising:

a compressor for compressing air;

A pressure accumulator for accumulating the compressed air compressed by the compressor;

An expander driven by the compressed air supplied from the accumulator portion;

A generator mechanically coupled to the expander;

a 1 st heat exchanger that cools the compressed air by performing heat exchange between the compressed air supplied from the compressor to the accumulator portion and a heat medium, and heats the heat medium;

a 1 st heat accumulating unit for accumulating the heat medium heated by the 1 st heat exchanger;

A 2 nd heat exchanger that heats the compressed air by exchanging heat between the compressed air supplied from the pressure accumulating portion to the expander and the heat medium supplied from the 1 st heat accumulating portion and cools the heat medium;

A 2 nd heat accumulating portion that accumulates the heat medium cooled in the 2 nd heat exchanger and supplies it to the 1 st heat exchanger;

a 1 st heat medium flow path and a 2 nd heat medium flow path connecting the 1 st heat storage part and the 2 nd heat storage part;

A 3 rd heat medium flow path connecting an intermediate portion of the 1 st heat medium flow path and an intermediate portion of the 2 nd heat medium flow path;

A 1 st opening/closing unit that opens and closes a 1 st area from the 1 st heat storage part to the 3 rd heat medium flow path among the 1 st heat medium flow path;

A 2 nd opening/closing unit that opens and closes a flow path in a 2 nd area from the 2 nd heat storage part to the 3 rd heat medium flow path among the 1 st heat medium flow path;

a 3 rd opening/closing unit that opens and closes a flow path from the 1 st heat storage part to a 3 rd region of the 3 rd heat medium flow path among the 2 nd heat medium flow path;

A 4 th opening/closing unit that opens and closes a flow path from the 2 nd heat storage part to a 4 th area of the 3 rd heat medium flow path among the 2 nd heat medium flow path;

A drive unit provided in the 3 rd heat medium flow path for flowing a heat medium; and

and a heating unit provided in the 3 rd heat medium flow path and heating the heat medium passing therethrough.

2. The compressed air energy-storing power generation device of claim 1,

the compressed air energy-storage power generation device further includes:

A 1 st temperature detection unit that detects a temperature of the heat medium stored in the 1 st heat storage unit;

A 2 nd temperature detection unit that detects a temperature of the heat medium stored in the 2 nd heat storage unit;

A capacity detection unit that detects a capacity of the heat medium stored in the 1 st heat storage unit; and

a control unit for controlling the operation of the display unit,

In the case where the detected temperature in the 2 nd temperature detecting unit is the 2 nd set temperature or less,

When the volume of the heat medium detected by the volume detection unit is equal to or greater than a set volume and the temperature of the heat medium detected by the 1 st temperature detection unit is equal to or greater than the 1 st set temperature, the 2 nd opening/closing unit and the 3 rd opening/closing unit are opened, the 1 st opening/closing unit and the 4 th opening/closing unit are closed, and the driving unit is driven, whereby the heat medium stored in the 1 st heat storage unit is supplied to the 2 nd heat storage unit,

On the other hand, when the volume of the heat medium detected by the volume detection unit is less than the set volume, or when the temperature of the heat medium detected by the 1 st temperature detection unit is less than the 1 st set temperature, the 1 st opening/closing unit and the 3 rd opening/closing unit are closed, the 2 nd opening/closing unit and the 4 th opening/closing unit are opened, the heat medium is heated by the heating unit, and the driving unit is driven, thereby circulating the heat medium stored in the 2 nd heat storage unit.

3. The compressed air energy-storing power generation device of claim 1,

the compressed air energy-storage power generation device further includes:

A 1 st temperature detection unit that detects a temperature of the heat medium stored in the 1 st heat storage unit;

A capacity detection unit that detects a capacity of the heat medium stored in the 1 st heat storage unit; and

a control unit for controlling the operation of the display unit,

The control means determines whether or not the detected capacity in the capacity detection means is equal to or greater than a set capacity when the detected temperature in the 1 st temperature detection means is equal to or less than the 1 st set temperature,

When it is determined that the capacity is less than the set capacity, the 1 st opening/closing means and the 3 rd opening/closing means are opened, the 2 nd opening/closing means and the 4 th opening/closing means are closed, the heating medium is heated by the heating means, and the driving means is driven, thereby circulating the heating medium stored in the 1 st heat storage unit,

On the other hand, when it is determined that the capacity is equal to or greater than the set capacity, the 1 st opening/closing means and the 4 th opening/closing means are opened, the 2 nd opening/closing means and the 3 rd opening/closing means are closed, the heating medium is heated by the heating means, and the driving means is driven, whereby the heating medium stored in the 2 nd heat storage unit is supplied to the 1 st heat storage unit.

4. the compressed air energy-storing power generation device of claim 1,

The compressed air energy-storage power generation device further includes:

a 2 nd temperature detection unit that detects a temperature of the heat medium stored in the 2 nd heat storage unit;

a cooling unit provided in a heat medium flow path from the 2 nd heat storage unit to the compressor;

a bypass flow path that bypasses the cooling unit; and

A control unit for controlling the operation of the display unit,

The control unit cools the heat medium stored in the 2 nd heat storage unit in the cooling unit when the temperature detected by the 2 nd temperature detection unit is equal to or higher than the 3 rd set temperature, and supplies the heat medium from a bypass passage bypassing the cooling unit when the temperature is lower than the 3 rd set temperature.

Technical Field

the present disclosure relates to compressed air energy storage power generation devices.

Background

power generation using renewable energy such as wind power generation and solar power generation depends on weather conditions, and therefore the output may fluctuate and become unstable. For such output fluctuations, a Compressed Air Energy Storage (CAES) system is known as a system for averaging the output.

For example, patent document 1 discloses a CAES power generation apparatus using a thermal energy storage system.

however, in the CAES power generation apparatus disclosed in patent document 1, no measures are taken against the problem caused by the decrease in temperature and the increase in viscosity of the heat medium.

disclosure of Invention

problems to be solved by the invention

An object of one aspect of the present invention is to provide a compressed air energy storage power generation device capable of stabilizing the flow state of a heat medium by effectively reducing the temperature of the heat medium.

Means for solving the problems

In one aspect of the present invention, there is provided a compressed air energy-storing power generation device as a means for solving the above-mentioned problems, comprising: a compressor for compressing air; a pressure accumulator for accumulating the compressed air compressed by the compressor; an expander driven by the compressed air supplied from the accumulator portion; a generator mechanically coupled to the expander; a 1 st heat exchanger that cools the compressed air by performing heat exchange between the compressed air supplied from the compressor to the accumulator portion and a heat medium, and heats the heat medium; a 1 st heat accumulating unit for accumulating the heat medium heated by the 1 st heat exchanger; a 2 nd heat exchanger that heats the compressed air by exchanging heat between the compressed air supplied from the pressure accumulating portion to the expander and the heat medium supplied from the 1 st heat accumulating portion and cools the heat medium; a 2 nd heat accumulating portion that accumulates the heat medium cooled in the 2 nd heat exchanger and supplies it to the 1 st heat exchanger; a 1 st heat medium flow path and a 2 nd heat medium flow path connecting the 1 st heat storage part and the 2 nd heat storage part; a 3 rd heat medium flow path connecting an intermediate portion of the 1 st heat medium flow path and an intermediate portion of the 2 nd heat medium flow path; a 1 st opening/closing unit that opens/closes a 1 st area passage from the 1 st heat storage part to the 3 rd heat medium passage among the 1 st heat medium passage; a 2 nd opening/closing unit that opens/closes a 2 nd area passage from the 2 nd heat storage part to the 3 rd heat medium passage among the 1 st heat medium passage; a 3 rd opening/closing unit that opens/closes a 3 rd zone flow path from the 1 st heat storage part to the 3 rd heat medium flow path among the 2 nd heat medium flow path; a 4 th opening/closing unit that opens/closes a 4 th area flow path from the 2 nd heat storage part to the 3 rd heat medium flow path among the 2 nd heat medium flow path; a drive unit provided in the 3 rd heat medium flow path for flowing a heat medium; and a heating unit provided in the 3 rd heat medium flow path and heating the heat medium passing therethrough.

According to this configuration, the heat medium can be switched between the 1 st flow in which the 2 nd opening/closing unit and the 3 rd opening/closing unit are opened and the 1 st opening/closing unit and the 4 th opening/closing unit are closed, and the 2 nd flow in which the 1 st opening/closing unit and the 3 rd opening/closing unit are closed and the 2 nd opening/closing unit and the 4 th opening/closing unit are opened. The heat medium can be switched between a 3 rd flow in which the 1 st opening/closing unit and the 3 rd opening/closing unit are opened and the 2 nd opening/closing unit and the 4 th opening/closing unit are closed, and a 4 th flow in which the 1 st opening/closing unit and the 4 th opening/closing unit are opened and the 2 nd opening/closing unit and the 3 rd opening/closing unit are closed. As a result, the heating medium can be prevented from being brought into a high viscosity state at a low temperature in the warm-up operation, and the flow state can be stabilized.

Preferably, the apparatus further comprises: a 1 st temperature detection unit that detects a temperature of the heat medium stored in the 1 st heat storage unit; a 2 nd temperature detection unit that detects a temperature of the heat medium stored in the 2 nd heat storage unit; a capacity detection unit that detects a capacity of the heat medium stored in the 1 st heat storage unit; and a control unit that opens the 2 nd opening/closing unit and the 3 rd opening/closing unit, closes the 1 st opening/closing unit and the 4 th opening/closing unit, and drives the driving unit when the volume of the heat medium detected by the volume detection unit is equal to or greater than a set volume and the temperature of the heat medium detected by the 1 st temperature detection unit is equal to or greater than a 1 st set temperature in a case where the detected temperature of the 2 nd temperature detection unit is equal to or less than the 2 nd set temperature, thereby supplying the heat medium stored in the 1 st heat storage unit to the 2 nd heat storage unit, and closes the 1 st opening/closing unit and the 3 rd opening/closing unit in a case where the volume of the heat medium detected by the volume detection unit is less than the set volume or in a case where the temperature of the heat medium detected by the 1 st temperature detection unit is less than the 1 st set temperature, the heating medium is heated by the heating means by opening the 2 nd opening/closing means and the 4 th opening/closing means, and the heating medium stored in the 2 nd heat storage part is circulated by driving the driving means.

According to this configuration, when the heat medium stored in the 1 st heat storage unit has a sufficient capacity and a high temperature, the heat medium can be used for raising the temperature of the heat medium in the 2 nd heat storage unit. In addition, when these conditions are not satisfied, the heating medium stored in the 2 nd heat storage unit can be heated while being circulated. This enables the warm-up operation to be ended earlier and shifted to the normal operation.

Preferably, the apparatus further comprises: a 1 st temperature detection unit that detects a temperature of the heat medium stored in the 1 st heat storage unit; a capacity detection unit that detects a capacity of the heat medium stored in the 1 st heat storage unit; and a control unit that determines whether or not the detected capacity in the capacity detection unit is equal to or greater than a set capacity when the detected temperature in the 1 st temperature detection unit is equal to or less than a 1 st set temperature, opens the 1 st opening/closing unit and the 3 rd opening/closing unit and closes the 2 nd opening/closing unit and the 4 th opening/closing unit when it is determined that the detected capacity is less than the set capacity, heats the heat medium in the 1 st heat storage unit by driving the driving unit, and that opens the 1 st opening/closing unit and the 4 th opening/closing unit and closes the 2 nd opening/closing unit and the 3 rd opening/closing unit and heats the heat medium in the heating unit and drives the driving unit when it is determined that the detected capacity is equal to or greater than the set capacity, thereby supplying the heat medium accumulated in the 2 nd heat accumulation portion to the 1 st heat accumulation portion.

According to this configuration, if the volume of the heat medium stored in the 1 st heat storage unit is sufficient, the heat medium can be heated and used for raising the temperature of the compressed air even when the temperature is low. Even if the capacity of the heat medium stored in the 1 st heat storage unit is insufficient, the temperature of the compressed air can be similarly increased by supplying and heating the heat medium from the 2 nd heat storage unit.

Preferably, the apparatus further comprises: a 2 nd temperature detection unit that detects a temperature of the heat medium stored in the 2 nd heat storage unit; a cooling unit provided in a heat medium flow path from the 2 nd heat storage unit to the compressor; a bypass flow path that bypasses the cooling unit; and a control unit which cools the heat medium stored in the 2 nd heat storage unit in the cooling unit when the temperature detected by the 2 nd temperature detection unit is equal to or higher than the 3 rd set temperature, and supplies the heat medium from a bypass passage bypassing the cooling unit when the temperature is lower than the 3 rd set temperature.

with this configuration, the temperature of the heat medium supplied to the heat exchanger can be easily adjusted to a desired value.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one aspect of the present invention, the temperature of the heat medium can be appropriately controlled to stabilize the flow pattern of the heat medium between the 1 st heat storage unit and the 2 nd heat storage unit by merely changing the open/close state of each open/close means.

Drawings

Fig. 1 is a schematic configuration diagram illustrating a CAES power generation apparatus according to the present embodiment.

Fig. 2 is an enlarged view of the heat medium module of fig. 1.

Fig. 3 is a flowchart showing the 1 st process of the control device of fig. 2.

Fig. 4 is a flowchart showing the 2 nd process of the control device of fig. 2.

Fig. 5 is a flowchart showing the 3 rd process of the control device of fig. 2.

Fig. 6 is a graph showing a relationship between the temperature and the viscosity of the heat medium flowing through the heat medium flow path of the compressed air energy storage and power generation device of fig. 1.

Detailed Description

embodiments according to the present invention will be described below with reference to the drawings. The following description is merely exemplary in nature and is not intended to limit the present invention, its applications, or uses. The drawings are schematic, and the ratios of the dimensions and the like are different from the actual ones.

fig. 1 is a schematic configuration diagram showing a CAES power generation apparatus 1. The CAES power generation device 1 includes a charging unit 2, a heat medium unit 3, a discharging unit 4, and an accumulator tank 5. The charging unit 2 includes a 1 st compressor 6, a 1 st heat exchanger 7, a 2 nd compressor 8, and a 2 nd heat exchanger 9. The heat medium module 3 includes a 1 st heat storage tank 10 and a 2 nd heat storage tank 11. The discharge unit 4 includes a 1 st expander 12, a 3 rd heat exchanger 13, a 2 nd expander 14, and a 4 th heat exchanger 15. The CAES power generation apparatus 1 can be divided into air flow paths 16a to 16g (shown by solid lines) and heat medium flow paths 17 to 17g (shown by dashed lines) according to the flows of air and heat medium. Hereinafter, the CAES power generation apparatus 1 will be described by being divided into members related to the air passages 16a to 16g and members related to the heat medium passages 17a to 17 g.

(air flow path)

In the air flow paths 16a to 16g, the 1 st compressor 6, the 1 st heat exchanger 7, the 2 nd compressor 8, the 2 nd heat exchanger 9, the accumulator tank 5, the 3 rd heat exchanger 13, the 1 st expander 12, the 4 th heat exchanger 15, and the 2 nd expander 14 are provided in this order from the upstream side to the downstream side of the air flow. The 1 st compressor 6, the 1 st heat exchanger 7, the 2 nd compressor 8, and the 2 nd heat exchanger 9 are provided in parallel with 3 sets of 1 set connected in series. The 3 rd heat exchanger 13, the 1 st expander 12, the 4 th heat exchanger 15, and the 2 nd expander 14 are also provided with 1 group of the series connection in parallel with 3 groups.

The 1 st compressor 6 and the 2 nd compressor 8 are driven by a motor not shown in the drawings to take in air from an intake port, compress the air therein, and discharge the compressed air as compressed air from a discharge port. The discharge port of the 1 st compressor 6 is connected to the suction port of the 2 nd compressor 8 via an air flow path 16 a. An air flow path 16b is connected to the discharge port of the 2 nd compressor 8. The air flow passages 16b extending from the respective 2 nd compressors 8 are connected to the accumulator tank 5 via a common air flow passage 16 c. In addition, various types of compressors such as a screw type, a scroll type, a turbine type, and a reciprocating type can be used for the 1 st compressor 6 and the 2 nd compressor 8.

the 1 st heat exchanger 7 and the 2 nd heat exchanger 9 cool the compressed air compressed in the 1 st compressor 6 and the 2 nd compressor 8 by a heat medium from a 2 nd heat storage tank 11 described later. Here, the 2-stage cooling is performed, that is, the compressed air from the 1 st compressor 6 is cooled by the 1 st heat exchanger 7, and then the compressed air having passed through the 2 nd compressor 8 is further cooled by the 2 nd heat exchanger 9. By this cooling of the compressed air, the density of the compressed air that can be stored in the 1 st heat storage tank 10 described later is increased, and the loss of thermal energy due to heat release during storage is suppressed.

The accumulator tank 5 stores compressed air as energy. The pressure accumulation tank 5 is connected to the supply ports of the 1 st expanders 12 through the common air flow path 16d and the individual air flow paths 16e, respectively. The compressed air sent from the accumulator tank 5 is supplied to each 1 st expander 12 via the air flow paths 16d and 16 e.

The 3 rd heat exchanger 13 is provided in the middle of the air flow path 16 e. The 4 th heat exchanger 15 is provided in the middle of an air flow path 16f connecting the exhaust port of the 1 st expander 12 and the supply port of the 2 nd expander 14. The 3 rd heat exchanger 13 and the 4 th heat exchanger 15 heat the compressed air sent from the pressure accumulation tank 5 by the heat medium from the 1 st heat storage tank 10 described later. The heating in 2 stages is performed here, and after the compressed air sent out from the accumulator tank 5 is heated by the 3 rd heat exchanger 13, the compressed air passing through the 3 rd heat exchanger 13 is further heated by the 4 th heat exchanger 15. By heating the compressed air, the expansion in the 1 st expander 12 and the 2 nd expander 14 is smoothly performed, and the power generation by the generator is appropriately performed.

The 1 st expander 12 and the 2 nd expander 14 are supplied with compressed air from supply ports, and operate by the supplied compressed air to drive an unillustrated generator. The air expanded in the 2 nd expander 14 is exhausted from the exhaust port via the air flow path 16 g. In addition, various types of expanders such as a screw type expander, a scroll type expander, a turbine type expander, and a reciprocating type expander can be used for the 1 st expander 12 and the 2 nd expander 14.

(Heat medium flow path)

in the heat medium flow paths 17a to 17g, the 1 st heat exchanger 7 and the 2 nd heat exchanger 9, the 1 st heat storage tank 10, the 3 rd heat exchanger 13, the 4 th heat exchanger 15, and the 2 nd heat storage tank 11 are provided in this order with respect to the flow direction of the annular flowing heat medium. The 1 st heat exchanger 7 and the 2 nd heat exchanger 9 are connected in parallel to form 1 group and 3 groups. The 3 rd heat exchanger 13 and the 4 th heat exchanger 15 are also connected in parallel to form 1 group and 3 groups. The 1 st pump 18 is provided in the heat medium flow path 17a extending from the 2 nd heat storage tank 11, and the on-off valves 19a and 19b are provided in the heat medium flow paths 17b and 17c branching into the 1 st heat exchanger 7 and the 2 nd heat exchanger 9, respectively. The 2 nd pump 20 is provided in the heat medium flow path 17d extending from the 1 st heat storage tank 10, and on-off valves 19c and 19d are provided in the heat medium flow paths 17e and 17f branched into the 3 rd heat exchanger 13 and the 4 th heat exchanger 15, respectively. As the heat medium, various heat media such as a mineral oil-based heat medium and an ethylene glycol-based heat medium can be used.

the 1 st heat exchanger 7 and the 2 nd heat exchanger 9 absorb heat from the compressed air compressed by the 1 st compressor 6 and the 2 nd compressor 8 by the heat medium supplied from the 2 nd heat storage tank 11 by driving of the 1 st pump 18. The heat medium which absorbs heat and becomes high temperature flows into the 1 st heat storage tank 10.

the 3 rd heat exchanger 13 and the 4 th heat exchanger 15 release heat from the heat medium supplied from the 1 st heat storage tank 10 by the driving of the 2 nd pump 20 to the compressed air supplied to the 1 st expander 12 and the 2 nd expander 14. The heat medium that has released heat and has become a low temperature flows into the 2 nd heat storage tank 11.

The 1 st heat storage tank 10 and the 2 nd heat storage tank 11 have a heat insulating structure. The 1 st heat storage tank 10 stores the heat medium that has been heated to a high temperature by the 1 st heat exchanger 7 and the 2 nd heat exchanger 9 absorbing heat from the compressed air. As shown in fig. 2, a heating heater 10a is provided in the heat medium flow path 17g connected to the vicinity of the inlet of the 1 st heat storage tank 10. The heating heater 10a is for auxiliary heating when the temperature of the heating medium recovered from the charging unit 2 does not increase so much. The 1 st heat storage tank 10 is provided with a 1 st temperature detection sensor 21 and a water level detection sensor 22. The temperature of the heat medium in the 1 st heat storage tank 10 detected by the 1 st temperature detection sensor 21 and the water level of the heat medium detected by the water level detection sensor 22 are input to the controller 38. The 2 nd heat storage tank 11 stores the heat medium that has been released to the compressed air and has a low temperature by the 3 rd heat exchanger 13 and the 4 th heat exchanger 15. The 2 nd heat storage tank 11 is provided with a 2 nd temperature detection sensor 23. The temperature of the heat medium in the 2 nd heat storage tank 11 detected by the 2 nd temperature detection sensor 23 is input to the control device 38.

The 1 st heat storage tank 10 and the 2 nd heat storage tank 11 are connected by a 1 st pipe 24 constituting the 1 st heat medium flow path and a 2 nd pipe 25 constituting the 2 nd heat medium flow path. The 1 st pipe 24 and the 2 nd pipe 25 are connected at their intermediate portions by a 3 rd pipe 26 constituting a 3 rd heat medium flow path. A 3 rd pump 27 and an electric heater 28 are provided in the middle of the 3 rd pipe 26. The passing heat medium can be heated by the electric heater 28. In the 1 st pipe 24, a 1 st opening/closing valve 29 and a 2 nd opening/closing valve 30 are provided on the 1 st heat storage tank 10 side and the 2 nd heat storage tank 11 side, respectively, from the connection portion of the 3 rd pipe 26. The 2 nd pipe 25 is also provided with a 3 rd opening/closing valve 31 and a 4 th opening/closing valve 32 on the 1 st heat storage tank 10 side and the 2 nd heat storage tank 11 side, respectively, from the connection portion of the 3 rd pipe 26.

A cooling water cooler 33 and a 5 th opening/closing valve 34 as cooling means are provided in the middle of the immediately preceding heat medium passage 17 branched from the 2 nd heat storage tank 11 to the 3 sets of the 1 st heat exchanger 7 and the 2 nd heat exchanger 9. The cooling water cooler 33 is supplied with cooling water of which the flow rate is controlled by driving the 4 th pump 35, and the passing heat medium can be cooled. A bypass passage 36 that bypasses the coolant cooler 33 is connected to the 2 nd heat storage tank 11. The bypass passage 36 is provided with a 6 th opening/closing valve 37. By closing one of the 5 th and 6 th opening/closing valves 34 and 37 and opening the other, either the 1 st route through the heat medium flow path 17 of the cooling water cooler 33 or the 2 nd route bypassing the cooling water cooler 33 can be selected.

(control method)

Next, the operation of the CAES power generation apparatus 1 configured as described above will be described. The control content of the controller 38 will be mainly described here. Specifically, the following description will be divided into the 1 st process for increasing the temperature of the heat medium in the 2 nd heat storage tank 11, the 2 nd process for increasing the temperature of the heat medium in the 1 st heat storage tank 10, and the 3 rd process for decreasing the temperature of the heat medium in the system after the start of the operation, which are executed during the warm-up operation.

Further, the viscosity of the heat medium changes due to the difference in temperature, and as shown in the graph of fig. 6, for example, the viscosity rapidly increases at a predetermined temperature (e.g., 50 ℃) or lower. And if the viscosity of the heat medium becomes high and the flow state becomes poor, the heat exchange performance in the 2 nd heat exchanger 7 is lowered. As a result, the temperature of the compressed air supplied to the expander 8 cannot be sufficiently increased, and the power generation performance is deteriorated. In addition, when the power generation output is small, although the flow rate of the compressed air is reduced, in this case, it is also necessary to secure a rated flow rate so that heat exchange with the heat medium is appropriately performed, and so-called heat medium loss occurs. Therefore, the following 1 st process and 2 nd process are executed to prevent such a problem from occurring.

(1 st Process: step S1)

As shown in fig. 3, in the 1 st process, the temperature (detected temperature) T2 of the heat medium in the 2 nd heat storage tank 11 detected by the 2 nd temperature detection sensor 23 is read (step S1-1), and it is determined whether or not the read detected temperature T2 is equal to or lower than the preset 2 nd set temperature T2 (step S1-2). When the heat medium temperature T2 exceeds the 2 nd set temperature T2, the heat medium in the 2 nd heat storage tank 11 is directly supplied to the 1 st heat exchanger 7 and the 2 nd heat exchanger 9, and the 1 st compressor 6 and the 2 nd compressor 8 are started to be driven (step S1-3). The compressed air compressed by the 1 st compressor 6 to have a high temperature is heat-exchanged with the heat medium in the 1 st heat exchanger 7 to have a low temperature. Then, the compressed air passing through the 1 st heat exchanger 7 is further compressed by the 2 nd compressor 8 to become high temperature again, and then exchanges heat with the heat medium in the 2 nd heat exchanger 9 to become low temperature.

When the detected temperature T2 of the 2 nd temperature detection sensor 23 is equal to or lower than the 2 nd set temperature T2 ("yes" in step S1-2), the water level of the heat medium in the 1 st heat storage tank 10 detected by the water level detection sensor 23 is read (step S1-4). Then, it is determined whether or not the volume v of the heat medium stored in the 1 st heat storage tank 10 is equal to or greater than the set volume Vs, based on the read water level of the heat medium (step S1-5). If the set capacity Vs or more is reached, it is determined whether or not the temperature T1 of the heat medium in the 1 st heat storage tank 10 detected by the 1 st temperature detection sensor 21 is the 1 st set temperature T1 or more (step S1-6).

When the volume v of the heat medium stored in the 1 st heat storage tank 10 is equal to or greater than the set volume Vs and the temperature T1 of the heat medium is equal to or greater than the 1 st set temperature T1, the 2 nd opening/closing valve 30 and the 3 rd opening/closing valve 31 are opened, and the 1 st opening/closing valve 29 and the 4 th opening/closing valve 32 are closed (step S1-7). Then, the drive of the 3 rd pump 27 is started (step S1-8). Further, the 1 st compressor 6 and the 2 nd compressor 8 start to be driven (step S1-3). Thereby, the high-temperature heat medium in the 1 st heat storage tank 10 is supplied to the 2 nd heat storage tank 11, and the temperature of the heat medium in the 2 nd heat storage tank 11 can be raised. By raising the temperature of the heat medium in the 2 nd heat medium tank, the viscosity is prevented from increasing, and a smooth flow is ensured.

When the volume v of the heat medium stored in the 1 st heat storage tank 10 is less than the set volume Vs or the temperature T1 of the heat medium is less than the 1 st set temperature T1, the 1 st opening/closing valve 29 and the 3 rd opening/closing valve 31 are closed, and the 2 nd opening/closing valve 30 and the 4 th opening/closing valve 32 are closed (step S1-9). Then, the electric heater 28 is energized (step S1-10), and the 3 rd pump 27 starts to be driven (step S1-8). When heating of the heat medium in the 1 st heat storage tank 10 cannot be expected, the heat medium in the 2 nd heat storage tank 11 is circulated and forcibly heated by the electric heater 28, and thus, similarly to the above, the viscosity of the heat medium can be prevented from increasing as the temperature of the heat medium decreases.

Thereafter, when the read heat medium temperature T2 exceeds the preset 2 nd set temperature T2, the 1 st compressor 6 and the 2 nd compressor 8 are started to be driven (step S1-3). Since the flow of the heat medium is made to be in a good state, the load on the 3 rd pump 27 is not increased any more, or a poor distribution of the heat medium to each member is not caused any more.

(2 nd Process: step S2)

As shown in fig. 4, in the 2 nd process, the 1 st temperature detection sensor 21 reads the temperature T1 of the heat medium in the 1 st heat storage tank 10 (step S2-1), and determines whether or not the read heat medium temperature T1 is equal to or lower than the 1 st set temperature T1 (step S2-2). When the heat medium temperature T1 exceeds the 1 st set temperature T1, it is determined that sufficient heat can be applied to the compressed air in the 3 rd heat exchanger 13 and the 4 th heat exchanger 15, and the 1 st expander 12 and the 2 nd expander 14 are started to operate (step S2-3). This can sufficiently heat the compressed air and smoothly perform the expansion in the 1 st expander 12 and the 2 nd expander 14.

when the detected temperature T1 of the 1 st temperature detection sensor 21 is equal to or lower than the 1 st set temperature T1, the water level of the heat medium detected by the water level detection sensor 23 is read (step S2-4). Then, the volume v of the heat medium in the 1 st heat storage tank 10 is calculated based on the read water level of the heat medium, and it is determined whether or not the volume v exceeds the set volume Vs (step S2-5). If it is determined that the volume v of the heat medium exceeds the set volume Vs, the 1 st opening/closing valve 29 and the 3 rd opening/closing valve 31 are opened, and the 2 nd opening/closing valve 30 and the 4 th opening/closing valve 32 are closed (step S2-6). The electric heater 28 is then energized (step S2-7), and the drive of the 3 rd pump 27 is started (step S2-8). Thus, the heat medium in the 1 st heat storage tank 10 is circulated and forcibly heated by the electric heater 28, whereby the temperature of the compressed air supplied to the 1 st expander 12 and the 2 nd expander 14 can be sufficiently increased.

If it is determined that the volume v of the heat medium in the 1 st heat storage tank 10 is equal to or less than the set volume Vs ("no" in step S2-5), the 1 st opening/closing valve 29 and the 4 th opening/closing valve 32 are opened, and the 2 nd opening/closing valve 30 and the 3 rd opening/closing valve 31 are closed (step S2-9). Then, the electric heater 28 is energized (step S2-7), and the drive of the 3 rd pump 27 is started (step S2-8). The heat medium in the 2 nd heat storage tank 11 can thereby be heated in the electric heater 28 and supplied into the 1 st heat storage tank 10. As a result, the capacity and temperature of the heat medium in the 1 st heat storage tank 10 are sufficiently maintained, and the compressed air supplied to the 1 st expander 12 and the 2 nd expander 14 can be sufficiently raised in temperature in the same manner as described above.

Thereafter, when the read heat medium temperature T1 exceeds the preset 2 nd set temperature T1, the 1 st compressor 6 and the 2 nd compressor 8 are started to be driven (step S2-3). Since the flow of the heat medium is made to be in a good state, the load on the 3 rd pump 27 is no longer increased, or a poor distribution of the heat medium to each member is not caused.

(3 rd Process: step S3)

As shown in fig. 5, in the 3 rd process, the detected temperature T2 of the 2 nd temperature detection sensor 23 is read (step S3-1), and it is determined whether or not the read detected temperature T2 is equal to or higher than the preset 3 rd set temperature T3 (step S3-2). When the detected temperature T2 is equal to or higher than the 3 rd set temperature T3, the 5 th opening/closing valve 34 is opened and the 6 th opening/closing valve 37 is closed (step S3-3). Then, by driving the 4 th pump 35 (step S3-4), the heat medium discharged from the 2 nd heat storage tank 11 is cooled by the coolant cooler 33, and thus the 1 st compressor 6 and the 2 nd compressor 8 can be prevented from becoming excessively high in temperature. On the other hand, when the detected temperature T2 is lower than the 3 rd set temperature T3 (NO in step S3-2), the 5 th opening/closing valve 34 is closed and the 6 th opening/closing valve 37 is opened (step S3-5). At this time, the 4 th pump 35 is not driven. Thus, the heat medium in the 2 nd heat storage tank 11, which is not at a high temperature, can be directly supplied to the 1 st compressor 6 and the 2 nd compressor 8, and the normal operation can be performed.

Description of reference numerals

1 CAES power generation device

2 charging assembly

3 heating medium subassembly

4 discharge assembly

5 pressure accumulation tank

6 st compressor

7 st 1 heat exchanger

8 nd 2 nd compressor

9 nd 2 heat exchanger

10 st 1 heat storage tank

10a heating heater

11 nd 2 nd heat storage tank

12 st expansion machine

13 rd 3 heat exchanger

14 nd 2 expansion machine

15 th 4 heat exchanger

16 a-16 g air flow path

17 a-17 g heat medium flow path

18 st pump

19 a-19 d opening and closing valve

20 nd 2 nd pump

21 st temperature detecting sensor

22 water level detection sensor

23 nd 2 temperature detecting sensor

24 st pipe

25 nd 2 nd pipe

26 rd pipe

27 rd 3 pump

28 electric heater

29 st opening and closing valve

30 nd opening/closing valve

31 3 rd opening and closing valve

32 th opening/closing valve

33 cooling water cooler

34 th 5 on-off valve

35 th 4 pump

36 bypass flow path

37 th opening and closing valve

38 control device