JP6605348B2 - Compressed air storage generator - Google Patents

Description

  The present invention relates to a compressed air storage power generator.

  Since power generation using renewable energy such as wind power generation and solar power generation depends on weather conditions, the output may fluctuate and be unstable. A compressed air energy storage (CAES) system is known as a system for leveling the output against such output fluctuations.

  A compressed air storage (CAES) power generation device using this CAES system stores electric energy as compressed air in an accumulator tank during off-peak hours of a power plant, and drives an expander with compressed air during high power demand time to generate electricity. The machine is operated to generate electrical energy and level the output. In order to improve power generation efficiency, a system is known in which compressed heat is recovered in a heat storage medium, stored in a heat storage tank or the like, and the compressed air before expansion is heated using the recovered compressed heat. As a result, there is one that prevents an increase in power during compression and increases recovery power during expansion, and at the same time, prevents heat release during storage of the accumulator tank.

  As such a CAES power generator, for example, Patent Document 1 discloses a device using a thermal energy storage system.

Special table 2013-509530 gazette

  There are two types of air compressors, one called an oil-cooled type that compresses air while the lubricating oil is mixed, and the other one called an oil-free type that does not use lubricating oil. Although Patent Document 1 does not describe the type of the compressor, an oil-free compressor is often used for the CAES system from the viewpoint of easy handling of compressed air. When an oil-cooled compressor or an oil-cooled expander is used, lubricating oil is required for operation. However, Patent Document 1 includes a special suggestion for improving the charge / discharge efficiency of a CAES power generator using the lubricating oil. Not in.

  An object of the present invention is to improve charge and discharge efficiency in a compressed air storage power generation apparatus using an oil-cooled compressor.

  The present invention includes an electric motor driven by electric power generated using renewable energy, an oil-cooled compressor driven by the electric motor, and a pressure accumulating unit that stores compressed air compressed by the oil-cooled compressor. , An expander driven by compressed air supplied from the pressure accumulator, a generator driven by the expander, and a compression for recovering heat generated in the oil-cooled compressor into lubricating oil and a heat medium The expander includes a side heat exchange unit, a heat storage unit that stores the lubricating oil and heat medium that have recovered heat at the compression side heat exchange unit, and the lubricating oil and heat medium that are stored in the heat storage unit. A compressed air storage power generator comprising: an expansion-side heat exchange unit that heats the compressed air supplied to the air.

  According to this configuration, the compression heat or friction heat in the oil-cooled compressor is collected in the heat storage unit by the compression side heat exchange unit, and the compressed air before expansion is heated by the expansion side heat exchange unit, thereby charging and discharging efficiency. Can be improved. Specifically, in the compression side heat exchange unit, by collecting the compression heat with the heat medium before storing the compressed air in the pressure accumulating unit, the temperature of the compressed air to be stored decreases and the density increases. The amount of compressed air increases and charging efficiency (compression efficiency) is improved. Furthermore, the power generation efficiency (expansion efficiency) is improved by using the heat medium recovering the compression heat and the lubricating oil recovering the frictional heat for heating the compressed air before the expansion in the expansion side heat exchange section.

  The compression side heat exchange unit includes a lubricating oil heat recovery unit that recovers heat generated in the oil-cooled compressor into lubricating oil, and the expansion side heat exchange unit is supplied from the pressure accumulating unit to the expander. It is preferable to provide an expansion side first heat exchanger that exchanges heat between the compressed air and the lubricating oil supplied from the heat storage unit to the oil-cooled compressor.

  According to this configuration, using the lubricating oil as a medium, the heat generated by the oil-cooled compressor is recovered in the lubricating oil heat recovery section, and the recovered heat is heated in the expansion side first heat exchanger before the expansion by the compressed air. Therefore, charging / discharging efficiency can be improved.

  The compression side heat exchange unit is a compression side that exchanges heat between the compressed air supplied from the oil-cooled compressor to the pressure storage unit and the heat medium supplied from the expansion side heat exchange unit to the heat storage unit. A heat exchanger, wherein the expansion side heat exchanging unit exchanges heat between the compressed air supplied from the pressure accumulating unit to the expander and the heat medium supplied from the heat accumulating unit to the compression side heat exchanging unit. It is preferable to provide an expansion side second heat exchanger.

  According to this configuration, using the heat medium as a medium, the heat generated in the oil-cooled compressor is recovered in the compression side heat exchanger, and the recovered heat is heated in the expansion side second heat exchanger before compressed air is expanded. Therefore, charging / discharging efficiency can be improved.

  Among the expansion side first heat exchanger and the expansion side second heat exchanger, the expansion side first heat exchanger is provided on the upstream side in the flow of the compressed air from the pressure accumulating part to the expander, It is preferable that the expansion-side second heat exchanger is provided on the downstream side in the flow of the compressed air from the pressure accumulating unit toward the expander.

  According to this configuration, when the compressed air before expansion is heated using the heat medium and the lubricating oil in the expansion side heat exchanging section, the lubricating oil temperature is further reduced by heat exchange of the lubricating oil first. Yes. Accordingly, it is possible to efficiently reuse the lubricating oil in the oil-cooled compressor. This is because, in particular, with lubricating oil and a heat medium, the lubricating oil directly acts on the function of the oil-cooled compressor, so it is preferable to lower the temperature of the lubricating oil.

  It is preferable that the lubricating oil and the heat medium are the same fluid, and the expansion side first heat exchanger and the expansion side second heat exchanger are the same one heat exchanger.

  According to this configuration, since the lubricating oil and the heat medium are the same fluid, the lubricating oil and the heat medium can be mixed and used. Therefore, an expansion side heat exchange part can be comprised from one heat exchanger, and the structure of an expansion side heat exchange part can be simplified.

  It is preferable that a heating unit is provided downstream of the exhaust port of the expander.

  The oil-cooled compressor has a lower temperature of the compressed air discharged compared to the oil-free compressor. For this reason, the oil-cooled compressor cannot recover the compression heat to the heat medium at a high temperature through the compression-side heat exchange unit, and therefore the heat storage temperature in the heat storage unit is lower than that in the oil-free compressor. Since the heat storage temperature is low, the compressed air before expansion cannot be heated to a high temperature through the expansion side heat exchange section. Therefore, the air after expansion may become a low temperature of zero degrees or less due to expansion heat absorption, and moisture in the air may freeze at the exhaust port of the expander, which may block the exhaust port. Therefore, it defrosts by heating an exhaust port with a heating part, and obstruction | occlusion is prevented.

  According to the present invention, the oil-cooled compressor recovers the compression heat, friction heat, and the like in the heat storage part by the compression side heat exchange part, and heats the compressed air before expansion by the expansion side heat exchange part. Charge / discharge efficiency can be improved in a compressed air storage power generator using a compressor.

The schematic structure figure of the compressed air storage power generator concerning a 1st embodiment of the present invention. 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 generator of the modification of FIG. The schematic block diagram of the compressed air storage power generator of the other modification of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
A compressed air energy storage (CAES) power generation device 2 equalizes the output fluctuation of the power generation device 4 that uses renewable energy and supplies power to the power system 6, and changes in power demand in the power system 6 Supply power that is suitable for.

  With reference to FIG. 1, the structure of the CAES power generator 2 is demonstrated. The CAES power generator 2 of the present embodiment includes air flow paths 8a to 8d (shown by broken lines), heat medium flow paths 10a to 10d (shown by solid lines), and lubricating oil flow paths 12a to 12e (shown by dashed lines). Have.

  The air flow paths 8a to 8d will be described.

  In the air flow paths 8 a to 8 d, an oil-cooled compressor (hereinafter sometimes simply referred to as a compressor) 16 driven by a motor (electric motor) 14, oil separators 18 a and 18 b, an accumulator tank (accumulator) 20. An expander 22 that drives the generator 24, a compression side heat exchange unit 26, and an expansion side heat exchange unit 28 are provided.

  The power generation device 4 that uses renewable energy is electrically connected to the motor 14 (indicated by a two-dot chain line), and the electric power generated by the power generation device 4 is supplied to the motor 14 and the motor 14 is driven. The motor 14 is mechanically connected to the compressor 16 and drives the compressor 16.

  The compressor 16 is oil-cooled, and is cooled and lubricated by supplying lubricating oil. When driven by the motor 14, the compressor 16 sucks air from the air intake port 16a through the air flow path 8a, compresses the air inside, and discharges compressed air from the discharge port 16b. The discharge port 16b of the compressor 16 is fluidly connected to the pressure accumulation tank 20 through the air flow path 8b, and the compressed air discharged from the discharge port 16b is pumped to the pressure accumulation tank 20 through the air flow path 8b. A valve 30a is provided in the air flow path 8b, and the supply of compressed air from the compressor 16 to the pressure accumulating tank 20 can be permitted or blocked by opening and closing the valve 30a. The type of the compressor 16 is not particularly limited as long as it is oil-cooled, and may be, for example, a screw type, a scroll type, a turbo type, a reciprocating type, or the like.

  An oil separator 18 a is interposed in the air flow path 8 b extending from the discharge port 16 b of the compressor 16 to the pressure accumulation tank 20. When the oil-cooled compressor 16 is used, compressed air containing oil is discharged from the discharge port 16b. The oil separator 18a separates oil from the discharged compressed air.

  The oil separator 18a includes an oil sump (not shown) that is an oil accumulation part separated from the compressed air flowing in the air flow path 8b. The oil sump is fluidly connected to a lubricating oil flow path 12a described later. It is connected to the. The oil separated from the compressed air by the oil separator 18a is supplied to the lubricating oil passage 12a as lubricating oil.

  A compression side heat exchanger 26 a is interposed as a cooler in the air flow path 8 b extending from the discharge port 16 b of the compressor 16 to the pressure accumulating tank 20. The compression side heat exchanger 26a is included in the compression side heat exchange unit 26 of the present invention. The compressed air supplied to the compression side heat exchanger 26a becomes a high temperature due to the compression heat generated during compression. In the compression side heat exchanger 26a, the compressed air is cooled by heat exchange between the heat medium and the compressed air, and the heat medium is heated.

  The accumulator tank 20 can store compressed air and store it as energy. The accumulator tank 20 is supplied with compressed air from which oil has been separated by the oil separator 18a as described above. The pressure accumulation tank 20 is fluidly connected to the expander 22 through the air flow path 8c, and the compressed air sent from the pressure accumulation tank 20 is supplied to the expander 22 through the air flow path 8c. A valve 30b is provided in the air flow path 8c, and the supply of compressed air from the pressure accumulation tank 20 to the expander 22 can be permitted or blocked by opening and closing the valve 30b.

  An expansion side first heat exchanger 28a and an expansion side second heat exchanger 28b are interposed in the air flow path 8c extending from the pressure accumulation tank 20 to the air supply port 22a of the expander 22. The expansion side first heat exchanger 28a and the expansion side second heat exchanger 28b constitute the expansion side heat exchange unit 28 of the present invention. In the expansion side first heat exchanger 28a, the compressed air is heated and the lubricating oil is cooled by heat exchange between the lubricating oil and the compressed air. In the expansion side second heat exchanger 28b, the compressed air is heated and the heat medium is cooled by heat exchange between the heat medium and the compressed air.

  The expander 22 is oil-cooled, and is cooled and lubricated by supplying lubricating oil. The expander 22 is mechanically connected to the generator 24, and the expander 22 supplied with compressed air from the air supply port 22 a is operated by the supplied compressed air and drives the generator 24. . The generator 24 is electrically connected to the power system 6 (indicated by a two-dot chain line), and the power generated by the generator 24 is supplied to the power system 6. The air expanded by the expander 22 is exhausted from the exhaust port 22b through the air flow path 8d. An oil separator 18b is provided in the air flow path 8d, and oil is removed from the air discharged from the exhaust port 22b by the oil separator 18b. The type of the expander 22 may be, for example, a screw type, a scroll type, a turbo type, and a reciprocating type. Furthermore, the expander 22 is not limited to the oil-cooled type, but may be an oil-free type.

  A defrosting heater (heating unit) 32 is provided in the air flow path 8d. In the present embodiment, the heater 32 is an electric type that is supplied with electric power and generates heat, but a high-temperature heat source such as the heat medium in the heat medium flow paths 10a to 10d and the lubricating oil in the lubricating oil flow paths 12a to 12e. It may be a heat exchange type that exchanges heat with.

  When the compressor 16 of the CAES power generation device 2 is not oil-free but oil-cooled as in the present embodiment, the lubricating oil injected into the compressor 16 takes heat during compression, so the discharge port 16b The discharged compressed air has a lower temperature than the oil-free type. Since the temperature of the lubricating oil is approximately the same as the compressed air that is discharged, high-temperature heat recovery as in the oil-free type cannot be performed. Therefore, since a high-temperature heating medium cannot be obtained and the air before expansion cannot be heated to a high temperature, the air expanded by the expander 22 may become below freezing at the stage where it is released to the atmosphere. Accordingly, moisture in the air may freeze at the exhaust port 22b of the expander 22 and block the exhaust port 22b. In order to solve this, a heater 32 for defrosting is provided in the present embodiment.

  The heat medium flow paths 10a to 10d will be described.

  In the heat medium passages 10a to 10d, a compression side heat exchanger 26a, a high temperature heat medium tank (heat storage unit) 34, an expansion side second heat exchanger 28b, and a low temperature heat medium tank 36 are sequentially provided. The heat medium circulates and flows between them. The kind of the heat medium is not particularly limited, and for example, a glycol heat medium may be used.

  In the compression side heat exchanger 26a, the compressed air in the air flow path 8b extending from the oil-cooled compressor 16 to the accumulator tank 20 and the heat medium flow paths 10d and 10a extending from the low temperature heat medium tank 36 to the high temperature heat medium tank 34 are obtained. Heat is exchanged with the internal heating medium. Specifically, the compressed air flowing in the air flow path 8b is heated to a high temperature due to the compression heat generated during the compression in the compressor 16, and the compressed air is exchanged by the heat exchange in the compression side heat exchanger 26a. It is cooling. That is, in the compression side heat exchanger 26a, the temperature of the compressed air decreases and the temperature of the heat medium increases. The compression side heat exchanger 26a is fluidly connected to the high temperature heat medium tank 34 through the heat medium flow path 10a, and the heat medium whose temperature has been increased is supplied to the high temperature heat medium tank 34 and stored therein.

  The high temperature heat medium tank 34 retains and stores the high temperature heat medium supplied from the compression side heat exchanger 26a. Therefore, it is preferable that the high-temperature heat medium tank 34 is insulated. The high temperature heat medium tank 34 is fluidly connected to the expansion side second heat exchanger 28b through the heat medium flow path 10b, and the heat medium stored in the high temperature heat medium tank 34 is expanded side through the heat medium flow path 10b. It is supplied to the second heat exchanger 28b.

  In the expansion side second heat exchanger 28b, the compressed air in the air flow path 8c extending from the accumulator tank 20 to the expander 22 and the heat medium flow paths 10b and 10c extending from the high temperature heat medium tank 34 to the low temperature heat medium tank 36 are obtained. The heat exchange with the heat medium. Specifically, the high-temperature heat medium in the high-temperature heat medium tank 34 is used to increase the temperature of the compressed air before expansion by the expander 22 to improve the expansion efficiency. That is, in the expansion side second heat exchanger 28b, the temperature of the compressed air increases and the temperature of the heat medium decreases. The expansion-side second heat exchanger 28b is fluidly connected to the low-temperature heat medium tank 36 through the heat medium flow path 10c, and the heat medium whose temperature has decreased is supplied to and stored in the low-temperature heat medium tank 36 through the heat medium flow path 10c. It is done.

  The low-temperature heat medium tank 36 stores the low-temperature heat medium supplied from the expansion side second heat exchanger 28b. The low temperature heat medium tank 36 is fluidly connected to the compression side heat exchanger 26a through the heat medium flow path 10d, and the heat medium stored in the low temperature heat medium tank 36 is compressed to the compression side heat exchanger through the heat medium flow path 10d. 26a.

  Thus, the heat medium circulates in the heat medium flow paths 10a to 10d. The heat medium is circulated by a pump 38a interposed in the heat medium flow path 10d. In the present embodiment, the pump 38a is provided downstream of the low-temperature heat medium tank 36, but the position thereof is not particularly limited.

  The lubricating oil passages 12a to 12e will be described.

  In the lubricating oil passages 12a to 12e, a compressor 16, a high temperature lubricating oil tank (heat storage unit) 40, an expansion side first heat exchanger 28a, and a low temperature lubricating oil tank 42 are provided in this order. The lubricating oil circulates and flows between them. The type of lubricating oil is not particularly limited, and for example, a mineral oil based lubricating oil may be used.

  In the expansion side first heat exchanger 28a, the compressed air in the air flow path 8c extending from the pressure accumulation tank 20 to the expander 22 and the lubricating oil flow paths 12b and 12c extending from the high temperature lubricating oil tank 40 to the low temperature lubricating oil tank 42 are obtained. Heat exchange with other lubricants. Specifically, the compressed air flowing in the air flow path 8c is heated by heat exchange with the lubricating oil. That is, in the expansion side first heat exchanger 28a, the temperature of the compressed air increases and the temperature of the lubricating oil decreases. The expansion side first heat exchanger 28a is fluidly connected to the low temperature lubricating oil tank 42 through the lubricating oil flow path 12c, and the heat medium whose temperature has decreased is supplied to and stored in the low temperature lubricating oil tank 42.

  The low temperature lubricating oil tank 42 stores the low temperature lubricating oil supplied from the expansion side first heat exchanger 28a. The low temperature lubricating oil tank 42 is fluidly connected to the expander 22 through the lubricating oil flow path 12d, and the heat medium stored in the low temperature lubricating oil tank 42 is supplied to the expander 22 through the lubricating oil flow path 12d. .

  In the expander 22, the internal expansion element is lubricated and cooled by the low-temperature lubricating oil supplied through the lubricating oil passage 12d. Since the screw type expander 22 is used in the present embodiment, for example, the internal expansion element is a screw rotor (not shown). Here, the temperature of the lubricating oil used for lubrication and heating is lowered by receiving cold heat or the like in the expansion element. The lubricating oil used in the expander 22 is returned again to the low temperature lubricating oil tank 42 through the lubricating oil flow path 12d. When the expander 22 is not oil-cooled, the lubricating oil passage 12d that fluidly connects the expander 22 and the low-temperature lubricating oil tank 42 is omitted.

  The low temperature lubricating oil tank 42 is fluidly connected to the compressor 16 through the lubricating oil passage 12e, and the heat medium stored in the low temperature lubricating oil tank 42 is supplied to the compressor 16 through the lubricating oil passage 12e. Is done.

  In the compressor 16, the internal compression element is lubricated and cooled by the low-temperature lubricating oil supplied through the lubricating oil passage 12e. Since the screw type compressor 16 is used in the present embodiment, for example, the internal compression element is a screw rotor (not shown). Here, the temperature of the lubricating oil used for lubrication and cooling rises due to warm heat in the compression element. Thus, in the present embodiment, the compressor 16 constitutes the lubricating oil heat recovery unit of the present invention included in the compression side heat exchange unit 26. The compressor 16 is fluidly connected to the high temperature lubricating oil tank 40 through the lubricating oil flow path 12a, and the lubricating oil whose temperature has risen in the compressor 16 is supplied to the high temperature lubricating oil tank 40 through the lubricating oil flow path 12a.

  The high temperature lubricating oil tank 40 retains and stores the high temperature lubricating oil supplied from the compressor 16. Therefore, the high temperature lubricating oil tank 40 is preferably insulated. The high temperature lubricating oil tank 40 is fluidly connected to the expansion side first heat exchanger 28a through the lubricating oil flow path 12b, and the heat medium stored in the high temperature lubricating oil tank 40 is expanded through the lubricating oil flow path 12b. It is supplied to the first heat exchanger 28a.

  Thus, the lubricating oil circulates in the lubricating oil flow paths 12a to 12e. The lubricating oil is circulated by pumps 38b and 38c provided in the lubricating oil flow paths 12d and 12e. In the present embodiment, the pumps 38b and 38c are provided downstream of the low temperature lubricating oil tank 42, but their positions are not particularly limited.

  According to the configuration of the CAES power generator 2 of the present embodiment, the compression heat or frictional heat in the oil-cooled compressor 16 is recovered in the high-temperature heat medium tank 34 and the high-temperature lubricating oil tank 40 by the compression-side heat exchange unit 26, Charging / discharging efficiency can be improved by heating the compressed air before expansion by the expansion side heat exchange unit 28. Specifically, by collecting the compression heat with the heat medium before storing the compressed air in the pressure accumulating tank 20 in the compression side heat exchanging unit 26, the temperature of the stored compressed air is lowered and the density is increased. The amount of compressed air in the pressure accumulating tank 20 is increased, and charging efficiency (compression efficiency) is improved. Furthermore, the heat generation efficiency (expansion efficiency) is improved by using the heat medium recovering the compression heat and the lubricating oil recovering the frictional heat for heating the compressed air before expansion in the expansion side heat exchanging section 28.

  Further, using the lubricating oil as a medium, the heat generated by the oil-cooled compressor 16 is recovered in the lubricating oil heat recovery section, and the recovered heat is used for heating the compressed air before expansion in the expansion side first heat exchanger 28a. Therefore, charge / discharge efficiency can be improved.

  Further, using the heat medium as a medium, the heat generated in the oil-cooled compressor 16 is recovered in the compression side heat exchanger 26a, and the recovered heat is used to heat the compressed air before expansion in the expansion side second heat exchanger 28b. Since it can be used, charge / discharge efficiency can be improved.

  In particular, regarding the arrangement of the expansion side first heat exchanger 28a and the expansion side second heat exchanger 28b in the air flow path 8c, the expansion side first heat exchanger 28a for lubricating oil is installed upstream, The expansion side second heat exchanger 28b is installed downstream.

  According to this configuration, when the compressed air before expansion is heated using the heat medium and the lubricating oil in the expansion side heat exchanging unit 28, the lubricating oil temperature is further lowered by performing heat exchange of the lubricating oil first. Yes. In particular, in the case of the lubricating oil and the heat medium, the lubricating oil directly affects the function of the oil-cooled compressor 16, and therefore it is preferable to lower the temperature of the lubricating oil.

(Second Embodiment)
In the CAES power generator 2 of the second embodiment shown in FIG. 2, the same fluid is used for the heat medium and the lubricating oil. Except for this point, the present embodiment is substantially the same as the first embodiment of FIG. Therefore, the same parts as those shown in FIG. Hereinafter, descriptions of both the heat medium and the lubricating oil are used, but in the present embodiment, the heat medium and the lubricating oil are not distinguished.

  The CAES power generator 2 of the present embodiment includes a high-temperature heat storage tank (heat storage unit) 46 in which the high-temperature heat medium tank 34 and the high-temperature lubricating oil tank 40 are integrated. That is, in the high-temperature heat storage tank 46, the heat medium and the lubricating oil are mixed and stored. As described above, in the present embodiment, since the heat medium and the lubricating oil are the same fluid, both fluids can be mixed and used.

  The high-temperature heat storage tank 46 is fluidly connected to the three-way valve 44a through the merging passage 11a in which the heat medium passage 10b (see FIG. 1) and the lubricating oil passage 12b (see FIG. 1) in the first embodiment are integrated. Has been. The three-way valve 44a is fluidly connected to the expansion side first heat exchanger 28a through the lubricating oil flow path 12f, and is fluidly connected to the expansion side second heat exchanger 28b through the heat medium flow path 10e. Therefore, the heat medium (lubricating oil) can be switched from the high temperature heat storage tank 46 to the expansion side first heat exchanger 28a or the expansion side second heat exchanger 28b by the three-way valve 44a.

  According to this configuration, since the lubricating oil and the heat medium are the same fluid, there is no problem even if the lubricating oil and the heat medium are mixed and used. Therefore, the expansion side heat exchange part 28 can be comprised from the one expansion side 3rd heat exchanger 28c, and the structure of the expansion side heat exchange part 28 can be simplified.

  FIG. 3 shows a modification of the CAES power generator 2 of the second embodiment shown in FIG. In this modification, the expansion side first heat exchanger 28a (see FIG. 2) and the expansion side second heat exchanger 28b (see FIG. 2) of the CAES power generator 2 of the second embodiment shown in FIG. An expansion side third heat exchanger (expansion side heat exchanging part) 28c is provided. Accordingly, the arrangement of the three-way valve 44b is also different from the arrangement of the three-way valve 44a of the CAES power generator 2 of the second embodiment shown in FIG.

  Specifically, the high-temperature heat storage tank 46 is fluidly connected to the expansion side third heat exchanger 28c through the merging channel 11a. Furthermore, the expansion side third heat exchanger 28c is fluidly connected to the three-way valve 44b through the merging channel 11b. The three-way valve 44b is fluidly connected to the low temperature lubricating oil tank 42 through the lubricating oil passage 12g, and is fluidly connected to the low temperature heating medium tank 36 through the heating medium passage 10f.

  Thus, when the heat medium and the lubricating oil are the same fluid, the expansion-side heat exchange unit 28 can be configured by one expansion-side third heat exchanger 28c.

  FIG. 4 shows another modification of the CAES power generator 2 of the second embodiment shown in FIG. In the present modification, an expansion side third heat exchanger 28c is provided in the same manner as the CAES power generator 2 shown in FIG. Furthermore, in this modification, a low-temperature heat storage tank 48 in which a low-temperature heat medium tank 36 (see FIG. 2) and a low-temperature lubricating oil tank 42 (see FIG. 2) are integrated is provided. Accordingly, the arrangement of the three-way valve 44c is also different from the CAES power generator 2 of the second embodiment shown in FIGS.

  Specifically, the expansion-side third heat exchanger 28c is fluidly connected to the low-temperature heat storage tank 48 through the merge channel 11b. The low-temperature heat storage tank 48 is fluidly connected to the three-way valve 44c through the merge channel 11c. The three-way valve 44c is fluidly connected to the compressor 16 through the lubricating oil passage 12h and fluidly connected to the compression side heat exchanger 26a through the heat medium passage 10g.

  Thus, when the heat medium and the lubricating oil are the same fluid, the low-temperature heat medium tank 36 (see FIG. 2) and the low-temperature lubricating oil tank 42 (see FIG. 2) may be configured by one low-temperature heat storage tank 48. it can.

  As mentioned above, although specific embodiment and its modification example of this invention were described, this invention is not limited to the said form, A various change can be implemented within the scope of this invention. For example, what combined suitably the content of each embodiment is good also as one Embodiment of this invention.

  In addition, renewable energy that can be used for power generation is energy that is constantly (or repetitively) supplemented by natural forces such as wind, sunlight, solar heat, wave or tidal power, running water or tide, and geothermal heat. Including all.

2 Compressed air storage generator (CAES generator)
4 Power generation device using renewable energy 6 Electric power system 8a, 8b, 8c, 8d Air flow path 10a, 10b, 10c, 10d, 10e, 10f, 10g Heat medium flow path 11a, 11b, 11c Merge flow path 12a, 12b , 12c, 12d, 12e, 12f, 12g, 12h Lubricating oil passage 14 Motor (electric motor)
16 Oil-cooled compressor (compressor) (lubricant oil heat recovery part) (compression side heat exchange part)
16a Intake port 16b Discharge port 18a, 18b Oil separator 20 Accumulation tank (accumulation part)
22 expander 22a air supply port 22b exhaust port 24 generator 26 compression side heat exchange part 26a compression side heat exchanger (compression side heat exchange part)
28 Expansion side heat exchange part 28a Expansion side 1st heat exchanger (expansion side heat exchange part)
28b Expansion side second heat exchanger (Expansion side heat exchange part)
28c Expansion side third heat exchanger (Expansion side heat exchange part)
30a, 30b Valve 32 Heater (heating part)
34 High-temperature heat medium tank (heat storage part)
36 Low temperature heating medium tank 38a, 38b, 38c Pump 40 High temperature lubricating oil tank (heat storage part)
42 Low temperature lubricating oil tank 44a, 44b, 44c Three-way valve 46 High temperature heat storage tank (heat storage section)
48 Low temperature heat storage tank

Claims (6)

An electric motor driven by electric power generated using renewable energy;
An oil-cooled compressor driven by the electric motor;
A pressure accumulator for storing compressed air compressed by the oil-cooled compressor;
An expander driven by compressed air supplied from the pressure accumulator;
A generator driven by the expander;
A compression-side heat exchange unit that recovers heat generated by the oil-cooled compressor into a lubricating oil and a heat medium;
A heat storage section for storing the lubricating oil and the heat medium that have recovered heat in the compression side heat exchange section;
A compressed air storage power generator comprising: an expansion side heat exchange unit that heats the compressed air supplied to the expander by the lubricating oil stored in the heat storage unit and the heat medium. The compression side heat exchange unit includes a lubricating oil heat recovery unit that recovers heat generated in the oil-cooled compressor to the lubricating oil,
The expansion side heat exchanging unit is configured to exchange heat between the compressed air supplied from the pressure accumulating unit to the expander and the lubricating oil supplied from the heat accumulating unit to the oil-cooled compressor. The compressed air storage power generation device according to claim 1, comprising a exchanger. The compression side heat exchange unit is a compression side that exchanges heat between the compressed air supplied from the oil-cooled compressor to the pressure storage unit and the heat medium supplied from the expansion side heat exchange unit to the heat storage unit. A heat exchanger,
The expansion side heat exchanging unit is configured to exchange heat between the compressed air supplied from the pressure accumulating unit to the expander and the heat medium supplied from the heat accumulating unit to the compression side heat exchanging unit. The compressed air storage power generator according to claim 2 provided with an exchange.   Among the expansion side first heat exchanger and the expansion side second heat exchanger, the expansion side first heat exchanger is provided on the upstream side in the flow of the compressed air from the pressure accumulating part to the expander, The compressed air storage power generator according to claim 3, wherein the expansion side second heat exchanger is provided on the downstream side in the flow of the compressed air from the pressure accumulating unit toward the expander.   The said lubricating oil and the said heat medium are the same fluids, The said expansion side 1st heat exchanger and the said expansion side 2nd heat exchanger are the same one heat exchanger, The claim 3 or Claim 4 characterized by the above-mentioned. Compressed air storage power generator.   The compressed air storage power generator according to any one of claims 1 to 5, further comprising a heating unit downstream of an exhaust port of the expander.

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