JP2019027363A - Compressed air storage power generation device - Google Patents

Abstract

To stably generate power without being influenced by change in the atmospheric temperature.SOLUTION: A compressed air storage power generation device includes a compressor 4, a pressure accumulation section 6, an expander 8, a power generator 12, a first heat exchanger 5, a first heat storage section 13, a second heat exchanger 7, a second heat storage section 14, temperature detecting means 22 for detecting a temperature of air sucked into the compressor 4, a third heat exchanger 9 provided in the upstream side of an inlet port of the compressor 4 and adjusting a temperature of the air passing through, and control means 21 for adjusting the temperature of the air passing through the third heat exchanger 9 so that the temperature detected by the temperature detecting means 22 becomes a set temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressed air storage power generation apparatus.

  In power generation using solar energy such as solar power generation and solar thermal power generation, the power generation output fluctuates greatly due to the influence of sunlight on the day. For example, power generation cannot be performed at night, and power generation output greatly decreases on rainy or cloudy days. Furthermore, on days when the generated power is large but demand is low, such as during the Golden Week or during the Bon holiday, it may be required to stop the power generation due to problems in the power system.

  On the other hand, in wind power generation using a windmill, the power generation output greatly fluctuates due to changes in wind direction and wind power on the day. In a power generation facility such as a wind farm that combines multiple windmills, the power generation output of each windmill can be added to smooth out short-term fluctuations in power generation. I can't. In addition, the windmill may have to be stopped on days when strong winds such as passing typhoons or winter storms occur. In addition, there may be a day when light winds do not need to be stored.

  In order to compensate for such an unstable output of renewable energy, a combination with a power storage device is performed. As the power storage device, a chemical secondary battery such as a lithium battery or a NAS battery is generally used. However, a compressed air storage (CAES) technique for storing and regenerating electric power in the form of compressed air is also known.

Patent applicants have proposed CAES techniques as shown in Patent Documents 1 and 2.
Patent Document 1 reuses heat from a low-temperature heat source in order to improve power generation efficiency. Specifically, heat is recovered from the main casing of the electric motor, the inverter casing, the compressor and the expander.
Patent Document 2 preheats a heat transfer oil that is easily solidified at a low temperature in order to perform a smooth warm-up operation in a cold region.

JP, 2006-048063, A JP 2017-008887 A

  The atmospheric temperature differs greatly between cold and warm regions, and varies widely from below freezing to over 40 ° C. Also, it is not uncommon for a temperature difference of nearly 20 degrees to occur during the day between early morning and hot weather, and there is a considerable difference in the outside air temperature between clear and overcast weather.

  In general compressors, even if the outside air temperature fluctuates and the temperature of the air to be sucked in (suction temperature) is different, there is no particular problem as long as the discharge temperature is different. However, in the CAES technology proposed by the patent applicant, when the suction temperature changes and the discharge temperature changes, the charge / discharge efficiency decreases and stable power generation cannot be performed.

  Specifically, when the suction temperature is lowered to 0 ° C., for example, the discharge temperature is lowered, and sufficient heat recovery from the discharge air cannot be performed. For this reason, the preheat of the compressed air at the time of re-power generation by the expander cannot be sufficiently performed, resulting in a decrease in power generation performance. If the temperature drops below freezing, the piping in the equipment may freeze.

  On the other hand, when the suction temperature rises to 40 ° C., for example, heat can be sufficiently recovered from the discharged air, but the temperature of the air finally introduced into the air tank increases. For this reason, a large amount of thermal energy is dissipated from the compressed air accumulated in the air tank, which also causes a decrease in charge / discharge efficiency. It is conceivable to insulate the air tank, but in the CAES power generator, the air tank may be enlarged, which is not easy in practice.

  It is an object of the present invention to provide a compressed air storage power generation apparatus and method that can stably generate power without being affected by changes in outside air temperature.

As a means for solving the above problems, the present invention provides:
A compressor for compressing the sucked air;
A pressure accumulator for storing compressed air compressed by the compressor;
An expander driven by compressed air supplied from the pressure accumulator;
A generator mechanically connected to the expander;
A first heat exchanger that cools the compressed air and heats the heat medium by exchanging heat between the compressed air and the heat medium supplied from the compressor to the pressure accumulator;
A first heat storage section for storing a heat medium heated by the first heat exchanger;
Second heat that heats the compressed air and cools the heat medium by exchanging heat between the compressed air supplied from the pressure accumulator to the expander and the heat medium supplied from the first heat accumulator. An exchange,
A second heat storage unit that stores the heat medium cooled by the second heat exchanger and supplies the heat medium to the first heat exchanger;
Temperature detecting means for detecting the temperature of air sucked into the compressor;
A third heat exchanger provided on the upstream side of the suction port of the compressor, for adjusting the temperature of air passing therethrough;
Control means for adjusting the temperature of the air passing through the third heat exchanger so that the temperature detected by the temperature detection means becomes a set temperature;
A compressed air storage power generation device is provided.

  With this configuration, the air sucked into the compressor can be adjusted to an appropriate temperature by the third heat exchanger. As a result, it is possible to prevent the occurrence of problems such that the temperature of the air discharged from the compressor cannot be sufficiently increased, or the temperature becomes too high and heat energy is dissipated in the air tank (pressure accumulator).

As the set temperature, at least a lower limit value can be set,
The control means may heat the air sucked into the compressor by the third heat exchanger when the temperature detected by the temperature detection means is lower than the lower limit value of the set temperature.

The set temperature consists of a predetermined temperature range having an upper limit value and a lower limit value,
The control means may further cool the air sucked into the compressor by the third heat exchanger when the temperature detected by the temperature detection means is higher than the upper limit value of the set temperature.

  With these configurations, fluctuations in the temperature of the air discharged from the compressor can be suppressed within a desired range.

  When cooling the air sucked into the compressor, the third heat exchanger uses a heat medium stored in the second heat storage unit, and when heating the air sucked into the compressor, the first heat storage It is preferable to use a heat medium stored in the part.

  With this configuration, the temperature of the air sucked into the compressor can be stabilized by effectively using existing equipment.

  It is preferable to further include temperature adjusting means for adjusting the temperature of the air before being sucked into the compressor.

  With this configuration, the temperature of the air sucked into the compressor can be more effectively controlled.

  According to the present invention, since the temperature of the air sucked into the compressor is controlled, it is possible to prevent the temperature of the air discharged from the compressor from greatly fluctuating and to stabilize the state during power generation.

It is a schematic diagram of a CAES power generator concerning a 1st embodiment. It is a block diagram of the control apparatus employ | adopted as the CAES power generator of FIG. It is a flowchart of the electric power generation process performed with the control apparatus of FIG. It is the schematic of the CAES electric power generating apparatus which concerns on 2nd Embodiment. It is the schematic of the CAES electric power generating apparatus which concerns on 3rd Embodiment. It is the schematic of the CAES electric power generating apparatus which concerns on 4th Embodiment.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In addition, the following description is only illustrations essentially and does not intend restrict | limiting this invention, its application thing, or its use. Further, the drawings are schematic, and the ratio of each dimension is different from the actual one.

(First embodiment)
FIG. 1 shows an outline of a compressed air energy storage (CAES) power generator according to a first embodiment. The CAES power generator 1 equalizes output fluctuations of a power generator that generates power using renewable energy and supplies power to the power system, and supplies power to the power system in accordance with fluctuations in power demand. The CAES power generation apparatus can be grasped by dividing it into an air flow path system 2 and a heat medium flow path system 3.

(Air channel system)
In the air flow path system 2, a compressor 4, a first heat exchanger 5, a pressure accumulating tank 6, which is an example of a pressure accumulating unit, a second heat exchanger 7, and an expander 8 are arranged in the air flow direction. In order. A third heat exchanger 9 is provided on the upstream side of the suction port 4 a of the compressor 4. As for the compressor 4 and the 1st heat exchanger 5, 1 set connected in series is provided in parallel 3 sets. As for the 2nd heat exchanger 7 and the expander 8, 3 sets of 1 set connected in series are provided in parallel. The air flow path system 2 includes air flow paths 10a to 10d. In FIG. 1, the air flow paths 10a to 10d are illustrated by solid lines.

  An electric motor 11 is mechanically connected to the compressor 4. A power generator (not shown) is electrically connected to the motor 11. The power generation device is not limited to these, but generates power using renewable energy such as wind power, sunlight, and solar heat. The electric motor 11 is driven by fluctuating input power from the power generator. The suction port 4a of each compressor 4 is fluidly connected to the individual flow path 10a1 branched from the air flow path 10a. A third heat exchanger 9 is provided in the common flow path 10a2 before branching of the air flow path 10a. The discharge port 4b of each compressor 4 is connected to the individual flow path 10b1 branched from the air flow path 10b, and is fluidly connected to the inlet of the pressure accumulating tank 6 via the merged common flow path 10b2. A first heat exchanger 5 is provided in each branched individual flow path 10b1. Further, a valve V1 that can be controlled to open and close is provided in the common flow path 10b2.

  The compressor 4 of this embodiment is a screw type. Since the screw type compressor 4 can control the rotation speed, it can follow the input power that fluctuates irregularly with good responsiveness, and is preferable as a component of the CAES power generator. The compressor 4 may be other than a screw type such as a scroll type, a turbo type, or a reciprocating type.

  The accumulator tank 6 can store compressed air and store it as energy. A common flow path 10c1 of the air flow path 10c is connected to the outlet of the pressure accumulation tank 6. A valve V2 is provided in the common flow path 10c1. The individual flow paths 10c2 branched from the common flow path 10c1 are fluidly connected to the air supply ports 8a of the expander 8, respectively. Each individual flow path 10c2 is provided with a second heat exchanger 7 respectively.

  A generator 12 is mechanically connected to each expander 8. Each generator 12 is electrically connected to a power system (not shown). The exhaust port 8b of the expander 8 is fluidly connected to an air flow path 10d for exhaust.

  The expander 8 of this embodiment is a screw type. The screw type expander 8 is preferable as a component of the CAES power generation device in that the rotation speed can be controlled. The expander 8 may be other than a screw type such as a scroll type, a turbo type, or a reciprocating type.

(Heat medium flow path system)
In the heat medium passage system 3, the first heat exchanger 5, the first heat storage tank 13 which is an example of the first heat storage unit, the second heat exchanger 7 and the second heat storage which is an example of the second heat storage unit. The tank 14 is provided in this order toward the flow direction of the heat medium. A third heat exchanger 9 is connected to the first heat storage tank 13 in parallel. The heat medium flow path system 3 includes heat medium flow paths 15a to 15c. In FIG. 1, the heat medium flow paths 15a to 15c are illustrated by dotted lines. The heat medium can be circulated in the heat medium flow paths 15a and 15b by driving the pumps 16A and 16B. The heat medium can be circulated in the heat medium flow path 15c by driving the pump 16C. Although the kind of heat medium is not specifically limited, For example, a mineral oil type or glycol type heat medium can be used.

  The first heat storage tank 13 has a heat insulating structure. The first heat storage tank 13 stores a heat medium that has absorbed heat from the compressed air by the first heat exchanger 5 and has reached a high temperature. The temperature of the heat medium stored in the first heat storage tank 13 is detected by the first temperature detection sensor 17 and input to the control device 21 described later. The second heat storage tank 14 stores a heat medium that has radiated heat to the compressed air by the second heat exchanger 7 to a low temperature. The temperature of the heat medium stored in the second heat storage tank 14 is detected by the second temperature detection sensor 18 and input to the control device 21 described later.

  Each first heat exchanger 5 is provided in the middle of an individual flow path 15 a 2 branched from a common flow path 15 a 1 of a heat medium flow path 15 a extending from the second heat storage tank 14. Each individual flow path 15a2 is provided with a valve V3 that can be controlled to open and close up to the first heat exchanger 5 and a pump 16A. Each individual flow path 15 a 2 joins the common flow path 15 a 3 and is fluidly connected to the first heat storage tank 13.

  Each second heat exchanger 7 is provided in the middle of the individual flow path 15b2 branched from the common flow path 15b1 of the heat medium flow path 15b extending from the first heat storage tank 13. Each individual flow path 15b2 is provided with a valve V4 that can be controlled to open and close until reaching the second heat exchanger 7, and a pump 16B. Each individual flow path 15 b 2 joins the common flow path 15 b 3 and is fluidly connected to the second heat storage tank 14.

  The third heat exchanger 9 is provided in the middle of the heat medium flow path 15 c branched from the common flow path 15 b 1 connected to the first heat storage tank 13 and returning to the first heat storage tank 13. A detour channel 15 d extending from the second heat storage tank 14 is connected to a junction between the first heat storage tank 13 and the third heat exchanger 9 in the middle of the heat medium channel 15 c. The heat medium flow path 15c is provided with a valve V5 that can be opened and closed between the first heat storage tank 13 and the junction, and a valve V6 that can be opened and closed between the junction and the third heat exchanger 9. A pump 16C is provided. Further, the bypass channel 15d is also provided with a valve V7 that can be controlled to open and close. If the valves V5 and V6 are opened and V7 is closed, the high-temperature heat medium in the first heat storage tank 13 is supplied to the third heat exchanger 9 and circulates. If the valve V5 is closed and the valves V6 and V7 are opened, the low-temperature heat medium in the second heat storage tank 14 is supplied to the third heat exchanger 9 and circulated. The third heat exchanger 9 adjusts the temperature of the air supplied to the compressor 4 and heats or lowers the air to a predetermined temperature.

(Compressor unit)
The compressor 4, the electric motor 11, the first heat exchanger 5, and the pump 16 </ b> A constitute a compressor unit 19. The compressor unit 19 includes a plurality of multistage compressors 4. A plurality of first heat exchangers 5 may be provided per compressor.

(Generator unit)
The expander 8, the generator 12, the second heat exchanger 7, and the pump 16 </ b> B constitute a generator unit 20. The generator unit 20 includes a plurality of multistage expanders 8. A plurality of second heat exchangers 7 may be provided per one expander.

(Control device)
FIG. 2 is a block diagram of the control device 21 employed in the CAES power generator of FIG. The control device 21 is an example of control means constructed by hardware including a storage device such as a CPU (Central Processing Unit), RAM (Random Access Memory), and ROM (Read Only Memory), and software installed therein. is there. As shown in FIG. 2, the control device 21 is an example of a temperature detection unit, and is an outside temperature detection sensor 22 that detects the outside temperature, and a first temperature detection sensor that detects the temperature of the heat medium in the first heat storage tank 13. 17 and the drive control of the generator 12, the pumps 16A to 16C, the valves V1 to V7, and the like based on an input signal from the second temperature detection sensor 18 or the like that detects the temperature of the heat medium in the second heat storage tank 14. To do.

  Next, the operation of the CAES power generator 1 having the above configuration will be described with reference to the flowchart of FIG. Here, a description will be given by dividing the charging operation and the power generation operation with a focus on the contents of control by the control device 21.

(Charging operation)
In the charging operation (step S1), the electric motor 11 is driven by the electric power from the power generator, and each compressor 4 is operated (step S1-1). The valves V1 and V3 are opened, and the valves V2 and V4 are closed (step S1-2). Then, the pump 16A is operated (step S1-3). In the state where the valves V2 and V4 are closed, it is usually unnecessary to operate the pump 16B.

  Here, the outside temperature to detected by the outside temperature detection sensor 22 is read (step S1-4). Then, the read outside air temperature to is compared with a preset temperature T (for example, 20 ° C.) stored in advance (step S1-5).

  When the outside air temperature to coincides with the set temperature T (step S1-5: to = T), the compressed air obtained by compressing the air sucked by the compressor 4 can be set to an appropriate temperature. For example, when the outside air temperature is 20 ° C., the temperature of the compressed air discharged from the compressor 4 is an appropriate temperature of about 148 ° C. In this case, by driving the compressor 4, the outside air is sucked and compressed in the compressor 4 and flows into the first heat exchanger 5 as compressed air. In the first heat exchanger 5, the heat medium in the second heat storage tank 14 is supplied by the operation of the pump 16A, and heat is exchanged between the compressed air and the heat medium. As described above, since the compressed air is heated to an appropriate temperature, the heat medium can be sufficiently heated by heat exchange with the heat medium. Further, the compressed air can be cooled to a value substantially close to the outside air temperature, and is sent to the pressure accumulating tank 6 and stored.

  When the outside air temperature to is lower than the set temperature T (step S1-5: to <T), the temperature of the compressed air obtained by compressing the air sucked by the compressor 4 cannot be sufficiently increased. For example, when the outside air temperature is 0 ° C., the temperature of the compressed air discharged from the compressor 4 rises only to about 120 ° C. For this reason, it becomes difficult to sufficiently heat the heat medium that exchanges heat with the compressed air in the first heat exchanger 5.

Therefore, the heat medium is heated by the third heat exchanger 9 as follows.
The first temperature detection sensor 17 reads the high-temperature heat medium temperature th that is the temperature of the heat medium in the first heat storage tank 13 (step S1-6). Heat that causes the third heat exchanger 9 to flow based on the read high temperature heat medium temperature, the difference between the set temperature and the outside air temperature, and the flow rate per unit time of the compressed air that causes the third heat exchanger 9 to flow The flow rate per unit time of the medium is calculated. And the drive rotation speed of the pump 16C is determined so that the calculated flow volume may be obtained (step S1-7). Further, the valve V5 and the valve V6 are opened, and the valve V7 is closed (step S1-8). Further, the driving of the pump 16C is started based on the driving rotational speed determined in step S1-7 (step S1-9). Thereby, the temperature of the air that passes through the third heat exchanger 9 and is supplied to the compressor 4 can be increased to a desired value. As a result, the temperature of the compressed air discharged from the compressor 4 is set to an appropriate value, and the heat exchange with the heat medium is performed by the first heat exchanger 5 to a temperature suitable for storing the pressure accumulating tank 6, that is, a value close to the outside air temperature. Can be lowered.

  On the other hand, when the outside air temperature to is higher than the set temperature T (step S1-5: to> T), the temperature of the compressed air obtained by compressing the air sucked by the compressor 4 becomes too high. For example, when the outside air temperature is 40 ° C., the temperature of the compressed air discharged from the compressor 4 becomes a high temperature state of about 177 ° C. For this reason, the compressed air is not completely cooled by the first heat exchanger 5 and is stored in the pressure accumulation tank 6. For example, in the example in which the temperature of the compressed air is about 177 ° C., it can be cooled only to about 60 ° C. even when passing through the first heat exchanger 5. Therefore, even if it stores in the pressure accumulation tank 6, it will radiate | emit to circumference | surroundings to 40 degreeC which is outside temperature, and energy efficiency is bad.

Therefore, the heat medium is cooled by the third heat exchanger 9 as follows.
The second temperature detection sensor 18 reads the low-temperature heat medium temperature tl, which is the temperature of the heat medium in the second heat storage tank 14 (step S1-10). Heat that causes the third heat exchanger 9 to flow based on the read low temperature heat medium temperature, the difference between the set temperature and the outside air temperature, and the flow rate per unit time of the compressed air that causes the third heat exchanger 9 to flow The flow rate per unit time of the medium is calculated. And the drive rotation speed of the pump 16C is determined so that the calculated flow volume may be obtained (step S1-11). Further, the valve V5 is closed and the valves V6 and V7 are opened (step S1-12). Further, the driving of the pump 16C is started based on the driving rotational speed determined in step S1-11 (step S1-13). As a result, the temperature of the air passing through the third heat exchanger 9 and supplied to the compressor 4 can be lowered to a desired value. Similarly to the above, the temperature of the compressed air suitable for storing the pressure accumulating tank 6, that is, the outside air temperature Can be lowered to a value close to.

(Power generation operation)
In the power generation operation, the valves V2 and V4 are opened, and the valves V1 and V3 are closed. Further, the pump 16B is operated. In the state where the valves V1 and V3 are closed, it is usually unnecessary to operate the pump 16A. By the operation of the pump 16B, the compressed air sent from the pressure accumulation tank 6 is supplied to the air supply port 8a of the expander 8 through the air flow path 10c. Before being supplied to the expander 8, the compressed air passes through the second heat exchanger 7 and is heated by heat exchange with the heat medium from the first heat storage tank 13. The heat medium stored in the first heat storage tank 13 is sufficiently heated by the above-described charging operation. Therefore, the compressed air can be heated sufficiently. The sufficiently heated compressed air is supplied into the expander 8 through the air supply port 8a. Thereby, the expander 8 operates and the generator 12 is driven. The power generated by the generator 12 is supplied to the power system. The air expanded by the expander 8 is exhausted from the exhaust port 8b through the air flow path 10d. The heat medium that has cooled down by radiating heat to the compressed air in the second heat exchanger 7 is stored in the second heat storage tank 14.

  As described above, in the charging operation, the air passing through the third heat exchanger 9 is changed so that the temperature of the compressed air discharged from the compressor 4 becomes the set temperature based on the outside air temperature sucked into the compressor 4. The temperature is controlled. Therefore, the heat medium stored in the first heat storage tank 13 cannot be sufficiently heated because the outside air temperature is low, and the compressed air supplied to the expander 8 during power generation cannot be raised to a desired temperature. On the contrary, the compressed air stored in the pressure accumulating tank 6 remains at a high temperature because the outside air temperature is high, and energy loss due to heat radiation does not occur.

  In the first embodiment, cooling is performed when the temperature of the air sucked into the compressor 4 (outside air temperature) is high. However, since measures against the low outside air temperature are important, the compressed air is cooled. The structure to perform is not necessarily required.

  In the first embodiment, the temperature of the air sucked into the compressor 4 (outside air temperature to) is controlled so as to become the set temperature T. However, the set temperature T has a width and the outside air temperature to If is within the set range, the temperature adjustment may not be performed. Then, only when the outside air temperature falls below the lower limit value of the set range, the air passing through the third heat exchanger 9 is heated, and only when the outside air temperature exceeds the upper limit value, the air may be cooled. For example, if the setting range is 18 ° C. to 22 ° C., the air passing through the third heat exchanger 9 is heated when the outside air temperature is lower than 18 ° C., and the air is cooled by being higher than 22 ° C. Good.

(Second Embodiment)
FIG. 4 is a schematic diagram of the CAES power generator 1 according to the second embodiment. In the CAES power generator 1 according to the second embodiment, the compressor 4 and the expander 8 are each a two-stage type. In the following description, the same components as those of the CAES power generator 1 described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the compressor unit 19, the air compressed by the first compressor 4A is further compressed by the second compressor 4B. Here, the first compressor 4A and the second compressor 4B are separate electric motors 11A. Although it is made to drive with 11B, you may make it drive with the same electric motor. Two first heat exchangers 5A and 5B are provided, and the compressed air discharged from the first compressor 4A and the compressed air discharged from the second compressor 4B are respectively converted into the first heat exchangers 5A and 5A. In 5B, the heat medium absorbs heat and is cooled. The heat medium that has passed through any of the first heat exchangers 5 </ b> A and 5 </ b> B is stored in the first heat storage tank 13. The heat medium flow path 15a toward the first heat exchangers 5A and 5B is further branched into two from the individual flow path 15a2, and valves V3a and V3b are respectively provided.

  Further, in the generator unit 20, the air expanded by the first expander 8A is further expanded by the second expander 8B. In this case, two second heat exchangers 7A and 7B are provided, and for the compressed air supplied to the first expander 8A and the compressed air from the first expander 8A supplied to the second expander 8B, Heat is released from the heat medium passing through the second heat exchangers 7A and 7B, respectively. The heat medium flow path 15b toward each of the second heat exchangers 7A and 7B is further branched into two from the individual flow path 15b2, and valves V4a and V4b are provided respectively. And the heat medium which passed any 2nd heat exchanger 7A, 7B is stored in the 2nd heat storage tank 14. FIG.

According to the CAES power generation apparatus 1 according to the second embodiment, the compressed air from the first compressor 4A absorbs heat in the first first heat exchanger 5A and then passes through the second compressor 4B. Can be further cooled in two stages in which heat is absorbed by the second first heat exchanger 5B. Therefore, the temperature of the heat medium that can be stored in the first heat storage tank 13 can be increased. Further, the compressed air is heated in two stages by the two second heat exchangers 7B. Therefore, the first expander 8A and the second expander 8B can be smoothly expanded, and the generator 12 can appropriately generate power.
Note that the compressor 4 and the expander 8 can be provided in three or more stages.

(Third embodiment)
FIG. 5 is a schematic diagram of the CAES power generator 1 according to the third embodiment. In the CAES power generator 1 according to the third embodiment, the heat medium supplied to the third heat exchanger 9 is circulated in the heat medium flow path 15 d provided separately from the heat medium flow path system 3. In the following description, the same components as those of the CAES power generator 1 described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  A temperature regulator 23, a pump 16 </ b> D, and a check valve 24 are provided in this order in the heat medium flow path 15 d for supplying a heat medium to the third heat exchanger 9. Examples of the temperature regulator 23 include a heater connected to an external power source and a heater that uses exhaust heat from an adjacent boiler outside the system. Moreover, it can also be set as the structure using the heat medium provided with the heating and cooling capability as the temperature regulator 23. FIG.

  In the case where a temperature regulator 23 having a heating capability is employed, the driving of the pump 16D may be controlled based on the outside air temperature detected by the outside air temperature detection sensor 22. That is, if the outside air temperature is low, the driving rotational speed of the pump 16D is increased, and conversely if it is high, it may be decreased or stopped. In this case, a heat medium temperature detection sensor for detecting the temperature of the heat medium adjusted by the temperature adjuster 23 is provided in the heat medium flow path 15d, and the heating capacity of the temperature adjuster 23 is adjusted based on the detected temperature. You may do it. Thereby, it is possible to stabilize the temperature of the heat medium in the third heat exchanger 9 within a predetermined range regardless of the difference in the outside air temperature.

  According to the CAES power generator 1 according to the third embodiment, the air to be sucked into the compressor 4 with a simple configuration in which only the temperature regulator 23 is provided without using a heat medium for cooling and heating the compressed air. The temperature can be adjusted.

(Fourth embodiment)
FIG. 6 shows a schematic diagram of the CAES power generator 1 according to the fourth embodiment. In addition to the configuration of the CAES power generator 1 according to the first embodiment, the CAES power generator 1 according to the fourth embodiment includes a temperature regulator 23 that is a characteristic part of the third embodiment. All components and flow paths are the same as those described in the above-described embodiments, and a description thereof is omitted.

  That is, the fourth heat exchanger 25 is provided on the upstream side of the third heat exchanger 9 in the air flow path 10, and the heat medium heated by the temperature regulator 23 is supplied to the fourth heat exchanger 25. . As a result, even if the outside air temperature is low and the third heat exchanger 9 alone cannot raise the temperature sufficiently, the fourth heat exchanger 25 that supplies the heat medium raised in temperature by the temperature regulator 23 can prevent the heat from being insufficient. Can be supplemented.

  In addition, this invention is not limited to the structure described in the said embodiment, A various change is possible.

  In the above embodiment, the air passing through the heat exchanger is heated or cooled using the heat medium stored in the heat storage tank, or the air passing directly through the temperature regulator 23 is heated or cooled. As described in 2, excess heat such as recovered heat from the lubricating oil and the casing may be used.

  In the above-described embodiment, the compressor and the expander are provided separately. However, the compressor may be reversely rotated to be an expander, and the compressor and the expander may be used together. In this case, the electric motor functions as a generator.

DESCRIPTION OF SYMBOLS 1 ... CAES power generation device 2 ... Air flow path system 3 ... Heat-medium flow path system 4, 4A, 4B ... Compressor 4a ... Suction port 5, 5A, 5B ... 1st heat exchanger 6 ... Accumulation tank (accumulation part)
7, 7A, 7B ... 2nd heat exchanger 8, 8A, 8B ... Expander 9 ... 3rd heat exchanger 10 ... Air flow path 11, 11A, 11B ... Electric motor 12, 12A, 12B ... Generator 13 ... 1st Thermal storage tank (first thermal storage unit)
14 ... 2nd heat storage tank (2nd heat storage part)
15a to 15c ... Heat medium passage 16A to 16D ... Pump 17 ... First temperature detection sensor 18 ... Second temperature detection sensor 19 ... Compressor unit 20 ... Generator unit 21 ... Control device (control means)
22: Outside temperature detection sensor (temperature detection means)
23 ... Temperature controller 24 ... Check valve 25 ... Fourth heat exchanger V1-V7 ... Valve

Claims (5)

A compressor for compressing the sucked air;
A pressure accumulator for storing compressed air compressed by the compressor;
An expander driven by compressed air supplied from the pressure accumulator;
A generator mechanically connected to the expander;
A first heat exchanger that cools the compressed air and heats the heat medium by exchanging heat between the compressed air and the heat medium supplied from the compressor to the pressure accumulator;
A first heat storage section for storing a heat medium heated by the first heat exchanger;
Second heat that heats the compressed air and cools the heat medium by exchanging heat between the compressed air supplied from the pressure accumulator to the expander and the heat medium supplied from the first heat accumulator. An exchange,
A second heat storage unit that stores the heat medium cooled by the second heat exchanger and supplies the heat medium to the first heat exchanger;
Temperature detecting means for detecting the temperature of air sucked into the compressor;
A third heat exchanger provided on the upstream side of the suction port of the compressor, for adjusting the temperature of air passing therethrough;
Control means for adjusting the temperature of the air passing through the third heat exchanger so that the temperature detected by the temperature detection means becomes a set temperature;
A compressed air storage power generator. As the set temperature, at least a lower limit value can be set,
2. The compression according to claim 1, wherein when the temperature detected by the temperature detection unit is lower than a lower limit value of the set temperature, the control unit heats the air sucked into the compressor by the third heat exchanger. Air storage power generator. The set temperature consists of a predetermined temperature range having an upper limit value and a lower limit value,
The control unit further cools the air sucked into the compressor by the third heat exchanger when the temperature detected by the temperature detection unit is higher than an upper limit value of the set temperature. Compressed air storage power generator.   When cooling the air sucked into the compressor, the third heat exchanger uses a heat medium stored in the second heat storage unit, and when heating the air sucked into the compressor, the first heat storage The compressed air storage power generator according to any one of claims 1 to 3, wherein a heat medium stored in the unit is used.   The compressed air storage power generator according to any one of claims 1 to 4, further comprising temperature adjusting means for adjusting the temperature of the air before being sucked into the third heat exchanger.

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