Compressed air heat energy recycling system

Abstract

The invention discloses a compressed air heat energy recycling system which comprises an air compressor, the air compressor is connected with a motor providing power for the air compressor, an expansion machine is connected with a generator, the inlet end of an air storage device is connected with the output end of the air compressor, and the outlet end of the air storage device is connected with the input end of the expansion machine. The heat storage and exchange device can collect and store heat of air between the air compressor and the air storage device, and the heat storage and exchange device can supply the stored heat to the air between the air storage device and the expansion machine and / or external heat utilization facilities. Heat generated by compressed air is effectively utilized through the heat storage and exchange device, the production cost is reduced, the energy utilization rate is increased, the heat storage and exchange device is combined with a compressed air energy storage system, energy can be stored, redundant heat is utilized, the energy storage effect is effectively improved, and meanwhile heat energy can be recycled.

Description

Technical Field

[0001] The invention relates to a compressed air heat energy recovery and utilization system, belonging to the technical field of energy storage systems. Background Art

[0002] The compressed air energy storage system has the advantages of large energy storage capacity and short construction period, and is considered to be one of the large-scale energy storage technologies with the broadest development prospects. At present, compressed air energy storage systems are mainly divided into isothermal compression and adiabatic compression, and the temperature changes when compressing air are different. In isothermal compression, the volume of the gas decreases after compression, and the temperature remains unchanged, so a certain amount of energy is required. In adiabatic compression, since heat cannot be dissipated, the temperature will continue to rise as the compression proceeds. When compressed to the final state, the temperature is already very high and needs to be cooled before use. In the prior art, when using adiabatic compression, due to the high temperature, a large amount of cooling water is required, and a large amount of heat resources are wasted during the compression process, affecting the compression effect. Therefore, we propose a compressed air heat energy recovery and utilization system. Summary of the invention

[0003] The purpose of the present invention is to provide a compressed air heat energy recovery and utilization system. The present invention is combined with a compressed air energy storage system to effectively utilize the heat generated by the compressed air and save production costs.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a compressed air heat energy recovery and utilization system, comprising:

[0005] An air compressor, wherein the air compressor is connected to an electric motor for providing power thereto, and the electric motor is connected to an external power supply facility, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0006] An expander, wherein the expander is connected to a generator and can provide power for the generator, wherein the generator is connected to an external power facility or is connected to a power grid;

[0007] A gas storage device, wherein the inlet end of the gas storage device is connected to the output end of the air compressor, and the outlet end of the gas storage device is connected to the input end of the expander. The gas storage device is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources;

[0008] A heat storage and heat exchange device, which can collect and store the heat of the air between the air compressor and the gas storage device, and the heat storage and heat exchange device can supply the stored heat to the air between the gas storage device and the expander and / or external heating facilities.

[0009] The aforementioned compressed air heat energy recovery and utilization system, the heat storage and heat exchange device comprises a first heat exchanger, the first heat exchanger is placed on the pipeline between the air compressor and the gas storage device, the air output end of the air compressor is connected to the hot medium inlet of the first heat exchanger, the hot medium outlet of the first heat exchanger is connected to the inlet of the gas storage device, the cold medium input end of the first heat exchanger is connected to the output end of the cold storage device, the cold medium output end of the first heat exchanger is connected to the input end of the heat storage device, a circulation loop is formed between the cold storage device and the inside of the heat storage device, and heat exchange oil is filled inside, the air compressor compresses the air to generate high-pressure hot air, which is heat exchanged through the first heat exchanger and then enters the gas storage device for storage, the cold heat exchange oil of the cold storage device is heated up after heat exchanged by the first heat exchanger, and is stored in the heat storage device;

[0010] The output end of the heat storage device is connected to the hot medium input end of the second heat exchanger, the hot medium output end of the second heat exchanger is connected to the input end of the cold storage device, the cold medium input end of the second heat exchanger is connected to the outlet end of the gas storage device, and the cold medium output end of the second heat exchanger is connected to the input of the expander. When the low-temperature compressed air in the gas storage device is released, it is heated and expanded after heat exchange through the second heat exchanger, and the generator is driven to generate electricity through the expander. The hot heat exchange oil of the heat storage device is cooled after heat exchange through the second heat exchanger and stored in the cold storage device.

[0011] In the aforementioned compressed air heat energy recovery and utilization system, the cold storage device and the heat storage device are also connected to an external heat exchanger, and the external heat exchanger is connected to an external water circulation system to provide heat for external users.

[0012] In the aforementioned compressed air heat energy recovery and utilization system, a combustion chamber is connected in parallel on the pipeline between the second heat exchanger and the expander. When the heat storage device is short of heat after supplying heat to the outside, the low-temperature compressed air released by the gas storage device can be heated and expanded by combustion in the combustion chamber.

[0013] In the aforementioned compressed air heat energy recovery and utilization system, the first heat exchanger and the second heat exchanger have the same structure.

[0014] In the aforementioned compressed air heat energy recovery and utilization system, the first heat exchanger includes a rectangular shell with a cavity formed inside, an upper rectangular upper collecting component is arranged on the upper side wall of the inner cavity of the shell, one end of the upper collecting component extends out of the rectangular shell and is connected to the output end of the cold storage device through a pipeline, a lower rectangular collecting component is arranged on the lower side wall of the inner cavity of the shell, one end of the lower collecting component extends out of the rectangular shell and is connected to the input end of the heat storage device through a pipeline, a plurality of rectangular and mutually parallel branch components are arranged between the upper collecting component and the lower collecting component, the interior of the branch component is cavity-shaped and is connected to the inner cavity of the upper collecting component and the lower collecting component, and the cold heat exchange oil in the cold storage device enters the upper collecting component and is distributed to the inner cavity of the plurality of branch components and then is collected to the lower collecting component and flows out;

[0015] A rectangular front collecting component is provided on the front side wall of the inner cavity of the shell, one end of the front collecting component extends out of the rectangular shell and is connected to the output end of the air compressor through a pipeline, and a rectangular rear collecting component is provided on the rear side wall of the inner cavity of the shell, one end of the rear collecting component extends out of the rectangular shell and is connected to the input end of the air storage device through a pipeline, and the front and rear ends of the plurality of branch components are sealedly connected to the front collecting component and the rear collecting component respectively, and the gaps between the adjacent branch components are connected to the inner cavities of the front collecting component and the rear collecting component. The hot air generated by the air compressor enters through the front collecting component and is distributed to the cavity between the plurality of branch components. After the hot air exchanges heat with the cold heat exchange oil, it is collected in the rear collecting component and flows out.

[0016] In the aforementioned compressed air heat energy recovery and utilization system, the angle a between the tributary component and the upper collecting component along the water flow direction is 105°-165°, preferably 155°; the angle b between the tributary component and the front collecting component along the water flow direction is 105°-165°, preferably 155°; the different resistance losses of each branch pipe of the multi-branch parallel pipeline is the direct cause of the uneven branch flow distribution; the inclined setting can reduce the branch resistance loss of the branch part, and the consistent angle can make the branch resistance of each branch part the same.

[0017] In the aforementioned compressed air heat energy recovery and utilization system, the cross-sectional area of ​​the upper collecting component across the water flow direction is larger than the sum of the cross-sectional areas of the inner cavities of the various branch components, and the cross-sectional area of ​​the front collecting component across the water flow direction is larger than the sum of the cross-sectional areas of the gaps between the various branch components. When the total resistance loss of each branch pipe in the parallel pipeline is small, the ratio of the cross-sectional area of ​​the collecting pipe to the sum of the cross-sectional areas of each branch pipe is designed to be greater than 1, and the flow distribution uniformity of each branch pipe is better.

[0018] In the aforementioned compressed air heat energy recovery and utilization system, the upper collecting component, the lower collecting component, the front collecting component and the rear collecting component are all provided with square and round reducing connecting components at the connection points with the pipeline, so as to facilitate the connection and achieve better diversion and confluence effects.

[0019] In the aforementioned compressed air heat recovery and utilization system, the branch components are made of metal materials, including one or more of carbon steel, alloy steel, copper and copper alloys, aluminum and aluminum alloys, titanium and titanium alloys, preferably alloy steel, to ensure that it has good thermal conductivity and relatively low cost.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] (1) The present invention effectively utilizes the heat generated by compressed air through a heat storage and heat exchange device, thereby saving production costs and energy utilization. In combination with a compressed air energy storage system, it can not only store energy but also utilize excess heat, effectively improving the energy storage effect, and at the same time, it can recycle and utilize heat energy.

[0022] (2) The structural design of the first heat exchanger and the second heat exchanger of the present invention is novel. The branch pipe parts are designed with an inclined angle so that the branch parts can reduce the branch pipe resistance loss of each branch. At the same time, the branch pipe resistance of each branch part can be the same by making the ratio of the cross-sectional area of ​​the header to the sum of the cross-sectional areas of each branch pipe greater than 1, so that the flow distribution uniformity of each branch pipe can be better, and the flow distribution of the cold medium and the hot medium in each branch part of the heat exchanger is uniform, which can effectively improve the heat exchange efficiency and reduce the energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0024] Figure 2 is a three-dimensional schematic diagram of a first heat exchanger of the present invention;

[0025] Figure 3 yes Figure 2 Schematic diagram of the cross section at point A;

[0026] Figure 4 It is a schematic cross-sectional view of point B of the present invention.

[0027] Figure markings: 1-air compressor, 2-electric motor, 3-air storage device, 4-expander, 5-generator, 6-heat storage and heat exchange device, 7-first heat exchanger, 701-rectangular shell, 702-upper collecting component, 703-lower collecting component, 704-branch component, 705-front collecting component, 706-rear collecting component, 707-square and round reducing connection component, 8-cold storage device, 9-heat storage device, 10-second heat exchanger, 11-external heat exchanger, 12-combustion chamber.

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0029] Embodiment 1 of the present invention: A compressed air heat energy recovery and utilization system, comprising:

[0030] An air compressor 1, the air compressor 1 is connected to an electric motor 2 for providing power thereto, and the electric motor 2 is connected to external power supply facilities, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0031] An expander 4, the expander 4 is connected to a generator 5 and can provide power for the generator 5, the generator 5 is connected to an external power facility, or is connected to a power grid;

[0032] The gas storage device 3 has an inlet end connected to the output end of the air compressor 1, and an outlet end connected to the input end of the expander 4. The gas storage device 3 is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources.

[0033] The heat storage and heat exchange device 6 can collect and store the heat of the air between the air compressor 1 and the gas storage device 3, and the heat storage and heat exchange device 6 can supply the stored heat to the air between the gas storage device 3 and the expander 4 and / or external heat facilities;

[0034] The heat generated by the air compressor 1 compressing the air can be recovered through the heat storage and heat exchange device 6, and the heat can be fed back to the compressed air expansion energy supply and external heating facilities, such as heating for external users.

[0035] Embodiment 2 of the present invention: A compressed air heat energy recovery and utilization system, comprising:

[0036] An air compressor 1, the air compressor 1 is connected to an electric motor 2 for providing power thereto, and the electric motor 2 is connected to external power supply facilities, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0037] An expander 4, the expander 4 is connected to a generator 5 and can provide power for the generator 5, the generator 5 is connected to an external power facility, or is connected to a power grid;

[0038] The gas storage device 3 has an inlet end connected to the output end of the air compressor 1, and an outlet end connected to the input end of the expander 4. The gas storage device 3 is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources.

[0039] The heat storage and heat exchange device 6 can collect and store the heat of the air between the air compressor 1 and the gas storage device 3, and the heat storage and heat exchange device 6 can supply the stored heat to the air between the gas storage device 3 and the expander 4 and / or external heat facilities;

[0040] The heat storage and heat exchange device 6 includes a first heat exchanger 7, which is placed on a pipeline between the air compressor 1 and the gas storage device 3. The air output end of the air compressor 1 is connected to the hot medium inlet of the first heat exchanger 7, and the hot medium outlet of the first heat exchanger 7 is connected to the inlet of the gas storage device 3. The cold medium input end of the first heat exchanger 7 is connected to the output end of the cold storage device 8, and the cold medium output end of the first heat exchanger 7 is connected to the input end of the heat storage device 9. A circulation loop is formed between the cold storage device 8 and the inside of the heat storage device 9, and heat exchange oil is filled inside. The air compressor 1 compresses the air to generate high-pressure hot air, which is heat exchanged through the first heat exchanger 7 and then enters the gas storage device 3 for storage. The cold heat exchange oil of the cold storage device 8 is heated after heat exchanged by the first heat exchanger 7 and is stored in the heat storage device 9.

[0041] The output end of the heat storage device 9 is connected to the hot medium input end of the second heat exchanger 10, the hot medium output end of the second heat exchanger 10 is connected to the input end of the cold storage device 8, the cold medium input end of the second heat exchanger 10 is connected to the outlet end of the gas storage device 3, and the cold medium output end of the second heat exchanger 10 is connected to the input of the expander 4. When the low-temperature compressed air in the gas storage device 3 is released, it is heated and expanded after heat exchange through the second heat exchanger 10, and the generator 5 is driven to generate electricity through the expander 4. The hot heat exchange oil of the heat storage device 9 is cooled after heat exchange through the second heat exchanger 10 and stored in the cold storage device 8.

[0042] Embodiment 3 of the present invention: A compressed air heat energy recovery and utilization system, comprising:

[0043] An air compressor 1, the air compressor 1 is connected to an electric motor 2 for providing power thereto, and the electric motor 2 is connected to external power supply facilities, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0044] An expander 4, the expander 4 is connected to a generator 5 and can provide power for the generator 5, the generator 5 is connected to an external power facility, or is connected to a power grid;

[0045] The gas storage device 3 has an inlet end connected to the output end of the air compressor 1, and an outlet end connected to the input end of the expander 4. The gas storage device 3 is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources.

[0046] The heat storage and heat exchange device 6 can collect and store the heat of the air between the air compressor 1 and the gas storage device 3, and the heat storage and heat exchange device 6 can supply the stored heat to the air between the gas storage device 3 and the expander 4 and / or external heat facilities;

[0047] The heat storage and heat exchange device 6 includes a first heat exchanger 7, which is placed on a pipeline between the air compressor 1 and the gas storage device 3. The air output end of the air compressor 1 is connected to the hot medium inlet of the first heat exchanger 7, and the hot medium outlet of the first heat exchanger 7 is connected to the inlet of the gas storage device 3. The cold medium input end of the first heat exchanger 7 is connected to the output end of the cold storage device 8, and the cold medium output end of the first heat exchanger 7 is connected to the input end of the heat storage device 9. A circulation loop is formed between the cold storage device 8 and the inside of the heat storage device 9, and heat exchange oil is filled inside. The air compressor 1 compresses the air to generate high-pressure hot air, which is heat exchanged through the first heat exchanger 7 and then enters the gas storage device 3 for storage. The cold heat exchange oil of the cold storage device 8 is heated after heat exchanged by the first heat exchanger 7 and is stored in the heat storage device 9.

[0048] The output end of the heat storage device 9 is connected to the hot medium input end of the second heat exchanger 10, the hot medium output end of the second heat exchanger 10 is connected to the input end of the cold storage device 8, the cold medium input end of the second heat exchanger 10 is connected to the outlet end of the gas storage device 3, and the cold medium output end of the second heat exchanger 10 is connected to the input of the expander 4. When the low-temperature compressed air in the gas storage device 3 is released, it is heated and expanded after heat exchange through the second heat exchanger 10, and the generator 5 is driven to generate electricity through the expander 4. The hot heat exchange oil of the heat storage device 9 is cooled after heat exchange through the second heat exchanger 10 and stored in the cold storage device 8.

[0049] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, and the external heat exchanger 11 is connected to an external water circulation system to provide heat for external users.

[0050] Specifically, a combustion chamber 12 is connected in parallel on the pipeline between the second heat exchanger 10 and the expander 4. When the heat storage device 9 is short of heat after supplying heat to the outside, the low-temperature compressed air released by the gas storage device 3 can be heated and expanded by combustion in the combustion chamber 12.

[0051] Embodiment 4 of the present invention: A compressed air heat energy recovery and utilization system, comprising:

[0052] An air compressor 1, the air compressor 1 is connected to an electric motor 2 for providing power thereto, and the electric motor 2 is connected to external power supply facilities, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0053] An expander 4, the expander 4 is connected to a generator 5 and can provide power for the generator 5, the generator 5 is connected to an external power facility, or is connected to a power grid;

[0054] The gas storage device 3 has an inlet end connected to the output end of the air compressor 1, and an outlet end connected to the input end of the expander 4. The gas storage device 3 is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources.

[0055] The heat storage and heat exchange device 6 can collect and store the heat of the air between the air compressor 1 and the gas storage device 3, and the heat storage and heat exchange device 6 can supply the stored heat to the air between the gas storage device 3 and the expander 4 and / or external heat facilities;

[0056] The heat storage and heat exchange device 6 includes a first heat exchanger 7, which is placed on a pipeline between the air compressor 1 and the gas storage device 3. The air output end of the air compressor 1 is connected to the hot medium inlet of the first heat exchanger 7, and the hot medium outlet of the first heat exchanger 7 is connected to the inlet of the gas storage device 3. The cold medium input end of the first heat exchanger 7 is connected to the output end of the cold storage device 8, and the cold medium output end of the first heat exchanger 7 is connected to the input end of the heat storage device 9. A circulation loop is formed between the cold storage device 8 and the inside of the heat storage device 9, and heat exchange oil is filled inside. The air compressor 1 compresses the air to generate high-pressure hot air, which is heat exchanged through the first heat exchanger 7 and then enters the gas storage device 3 for storage. The cold heat exchange oil of the cold storage device 8 is heated after heat exchanged by the first heat exchanger 7 and is stored in the heat storage device 9.

[0057] The output end of the heat storage device 9 is connected to the hot medium input end of the second heat exchanger 10, the hot medium output end of the second heat exchanger 10 is connected to the input end of the cold storage device 8, the cold medium input end of the second heat exchanger 10 is connected to the outlet end of the gas storage device 3, and the cold medium output end of the second heat exchanger 10 is connected to the input of the expander 4. When the low-temperature compressed air in the gas storage device 3 is released, it is heated and expanded after heat exchange through the second heat exchanger 10, and the generator 5 is driven to generate electricity through the expander 4. The hot heat exchange oil of the heat storage device 9 is cooled after heat exchange through the second heat exchanger 10 and stored in the cold storage device 8.

[0058] The first heat exchanger 7 has the same structure as the second heat exchanger 10. The first heat exchanger 7 includes a rectangular shell 701 with a cavity formed inside. A rectangular upper flow collecting component 702 is provided on the upper side wall of the inner cavity of the shell 701. One end of the upper flow collecting component 702 extends out of the rectangular shell 701 and is connected to the output end of the cold storage device 8 through a pipeline. A rectangular lower flow collecting component 703 is provided on the lower side wall of the inner cavity of the shell 701. One end of the lower flow collecting component 703 extends out of the rectangular shell 701 and is connected to the input end of the heat storage device 9 through a pipeline. A plurality of rectangular and mutually parallel tributary components 704 are provided between the upper flow collecting component 702 and the lower flow collecting component 703. The tributary components 704 have a cavity inside and are connected to the inner cavities of the upper flow collecting component 702 and the lower flow collecting component 703. After the cold heat exchange oil in the cold storage device 8 enters the upper flow collecting component 702, it is distributed to the inner cavities of the plurality of tributary components 704 and then collected to the lower flow collecting component 703 and flows out.

[0059] A rectangular front collecting component 705 is provided on the front side wall of the inner cavity of the shell 701, one end of the front collecting component 705 extends out of the rectangular shell 701 and is connected to the output end of the air compressor 1 through a pipeline, and a rectangular rear collecting component 706 is provided on the rear side wall of the inner cavity of the shell 701, one end of the rear collecting component 706 extends out of the rectangular shell 701 and is connected to the input end of the air storage device 3 through a pipeline, and the front and rear ends of multiple branch components 704 are sealed and connected to the front collecting component 705 and the rear collecting component 706 respectively, and the gaps between each adjacent branch component 704 are connected to the inner cavity of the front collecting component 705 and the rear collecting component 706. The hot air generated by the air compressor 1 enters through the front collecting component 705 and is distributed to the cavity between the multiple branch components 704. After the hot air exchanges heat with the cold heat exchange oil, it is collected in the rear collecting component 706 and flows out.

[0060] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, and the external heat exchanger 11 is connected to an external water circulation system to provide heat for external users.

[0061] Specifically, a combustion chamber 12 is connected in parallel on the pipeline between the second heat exchanger 10 and the expander 4. When the heat storage device 9 is short of heat after supplying heat to the outside, the low-temperature compressed air released by the gas storage device 3 can be heated and expanded by combustion in the combustion chamber 12.

[0062] Embodiment 5 of the present invention: A compressed air heat energy recovery and utilization system, comprising:

[0063] An air compressor 1, the air compressor 1 is connected to an electric motor 2 for providing power thereto, and the electric motor 2 is connected to external power supply facilities, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0064] An expander 4, the expander 4 is connected to a generator 5 and can provide power for the generator 5, the generator 5 is connected to an external power facility, or is connected to a power grid;

[0065] The gas storage device 3 has an inlet end connected to the output end of the air compressor 1, and an outlet end connected to the input end of the expander 4. The gas storage device 3 is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources.

[0066] The heat storage and heat exchange device 6 can collect and store the heat of the air between the air compressor 1 and the gas storage device 3, and the heat storage and heat exchange device 6 can supply the stored heat to the air between the gas storage device 3 and the expander 4 and / or external heat facilities;

[0067] The heat storage and heat exchange device 6 includes a first heat exchanger 7, which is placed on a pipeline between the air compressor 1 and the gas storage device 3. The air output end of the air compressor 1 is connected to the hot medium inlet of the first heat exchanger 7, and the hot medium outlet of the first heat exchanger 7 is connected to the inlet of the gas storage device 3. The cold medium input end of the first heat exchanger 7 is connected to the output end of the cold storage device 8, and the cold medium output end of the first heat exchanger 7 is connected to the input end of the heat storage device 9. A circulation loop is formed between the cold storage device 8 and the inside of the heat storage device 9, and heat exchange oil is filled inside. The air compressor 1 compresses the air to generate high-pressure hot air, which is heat exchanged through the first heat exchanger 7 and then enters the gas storage device 3 for storage. The cold heat exchange oil of the cold storage device 8 is heated after heat exchanged by the first heat exchanger 7 and is stored in the heat storage device 9.

[0068] The output end of the heat storage device 9 is connected to the hot medium input end of the second heat exchanger 10, the hot medium output end of the second heat exchanger 10 is connected to the input end of the cold storage device 8, the cold medium input end of the second heat exchanger 10 is connected to the outlet end of the gas storage device 3, and the cold medium output end of the second heat exchanger 10 is connected to the input of the expander 4. When the low-temperature compressed air in the gas storage device 3 is released, it is heated and expanded after heat exchange through the second heat exchanger 10, and the generator 5 is driven to generate electricity through the expander 4. The hot heat exchange oil of the heat storage device 9 is cooled after heat exchange through the second heat exchanger 10 and stored in the cold storage device 8.

[0069] The first heat exchanger 7 has the same structure as the second heat exchanger 10. The first heat exchanger 7 includes a rectangular shell 701 with a cavity formed inside. A rectangular upper flow collecting component 702 is provided on the upper side wall of the inner cavity of the shell 701. One end of the upper flow collecting component 702 extends out of the rectangular shell 701 and is connected to the output end of the cold storage device 8 through a pipeline. A rectangular lower flow collecting component 703 is provided on the lower side wall of the inner cavity of the shell 701. One end of the lower flow collecting component 703 extends out of the rectangular shell 701 and is connected to the input end of the heat storage device 9 through a pipeline. A plurality of rectangular and mutually parallel tributary components 704 are provided between the upper flow collecting component 702 and the lower flow collecting component 703. The tributary components 704 have a cavity inside and are connected to the inner cavities of the upper flow collecting component 702 and the lower flow collecting component 703. After the cold heat exchange oil in the cold storage device 8 enters the upper flow collecting component 702, it is distributed to the inner cavities of the plurality of tributary components 704 and then collected to the lower flow collecting component 703 and flows out.

[0070] A rectangular front collecting component 705 is provided on the front side wall of the inner cavity of the shell 701, one end of the front collecting component 705 extends out of the rectangular shell 701 and is connected to the output end of the air compressor 1 through a pipeline, and a rectangular rear collecting component 706 is provided on the rear side wall of the inner cavity of the shell 701, one end of the rear collecting component 706 extends out of the rectangular shell 701 and is connected to the input end of the air storage device 3 through a pipeline, and the front and rear ends of multiple branch components 704 are sealed and connected to the front collecting component 705 and the rear collecting component 706 respectively, and the gaps between each adjacent branch component 704 are connected to the inner cavity of the front collecting component 705 and the rear collecting component 706. The hot air generated by the air compressor 1 enters through the front collecting component 705 and is distributed to the cavity between the multiple branch components 704. After the hot air exchanges heat with the cold heat exchange oil, it is collected in the rear collecting component 706 and flows out.

[0071] The angle a between the tributary component 704 and the upper collecting component 702 along the water flow direction is 105°-165°, preferably 155°. The angle b between the tributary component 704 and the front collecting component 705 along the water flow direction is 105°-165°, preferably 155°. The different resistance losses of each branch pipe of the multi-branch parallel pipeline is the direct cause of the uneven branch flow distribution. The inclined setting can reduce the branch resistance loss of the branch part, and the consistent angle can make the branch resistance of each branch part the same.

[0072] The cross-sectional area of ​​the upper collecting component 702 across the water flow direction is larger than the sum of the inner cross-sectional areas of each branch component 704, and the cross-sectional area of ​​the front collecting component 705 across the water flow direction is larger than the sum of the gap cross-sectional areas between each branch component 704. When the total resistance loss of each branch pipe in the parallel pipeline is small, the ratio of the cross-sectional area of ​​the collecting pipe to the sum of the cross-sectional areas of each branch pipe is designed to be greater than 1, and the flow distribution uniformity of each branch pipe is better.

[0073] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, and the external heat exchanger 11 is connected to an external water circulation system to provide heat for external users.

[0074] Specifically, a combustion chamber 12 is connected in parallel on the pipeline between the second heat exchanger 10 and the expander 4. When the heat storage device 9 is short of heat after supplying heat to the outside, the low-temperature compressed air released by the gas storage device 3 can be heated and expanded by combustion in the combustion chamber 12.

[0075] Embodiment 6 of the present invention: A compressed air heat energy recovery and utilization system, comprising:

[0076] An air compressor 1, the air compressor 1 is connected to an electric motor 2 for providing power thereto, and the electric motor 2 is connected to external power supply facilities, including wind power, thermal power, hydropower and other power generation facilities and a power grid;

[0077] An expander 4, the expander 4 is connected to a generator 5 and can provide power for the generator 5, the generator 5 is connected to an external power facility, or is connected to a power grid;

[0078] The gas storage device 3 has an inlet end connected to the output end of the air compressor 1, and an outlet end connected to the input end of the expander 4. The gas storage device 3 is preferably an underground salt cave, an abandoned mine, etc., so as to reasonably utilize the abandoned resources.

[0079] The heat storage and heat exchange device 6 can collect and store the heat of the air between the air compressor 1 and the gas storage device 3, and the heat storage and heat exchange device 6 can supply the stored heat to the air between the gas storage device 3 and the expander 4 and / or external heat facilities;

[0080] The heat storage and heat exchange device 6 includes a first heat exchanger 7, which is placed on a pipeline between the air compressor 1 and the gas storage device 3. The air output end of the air compressor 1 is connected to the hot medium inlet of the first heat exchanger 7, and the hot medium outlet of the first heat exchanger 7 is connected to the inlet of the gas storage device 3. The cold medium input end of the first heat exchanger 7 is connected to the output end of the cold storage device 8, and the cold medium output end of the first heat exchanger 7 is connected to the input end of the heat storage device 9. A circulation loop is formed between the cold storage device 8 and the inside of the heat storage device 9, and heat exchange oil is filled inside. The air compressor 1 compresses the air to generate high-pressure hot air, which is heat exchanged through the first heat exchanger 7 and then enters the gas storage device 3 for storage. The cold heat exchange oil of the cold storage device 8 is heated after heat exchanged by the first heat exchanger 7 and is stored in the heat storage device 9.

[0081] The output end of the heat storage device 9 is connected to the hot medium input end of the second heat exchanger 10, the hot medium output end of the second heat exchanger 10 is connected to the input end of the cold storage device 8, the cold medium input end of the second heat exchanger 10 is connected to the outlet end of the gas storage device 3, and the cold medium output end of the second heat exchanger 10 is connected to the input of the expander 4. When the low-temperature compressed air in the gas storage device 3 is released, it is heated and expanded after heat exchange through the second heat exchanger 10, and the generator 5 is driven to generate electricity through the expander 4. The hot heat exchange oil of the heat storage device 9 is cooled after heat exchange through the second heat exchanger 10 and stored in the cold storage device 8.

[0082] The first heat exchanger 7 has the same structure as the second heat exchanger 10. The first heat exchanger 7 includes a rectangular shell 701 with a cavity formed inside. A rectangular upper flow collecting component 702 is provided on the upper side wall of the inner cavity of the shell 701. One end of the upper flow collecting component 702 extends out of the rectangular shell 701 and is connected to the output end of the cold storage device 8 through a pipeline. A rectangular lower flow collecting component 703 is provided on the lower side wall of the inner cavity of the shell 701. One end of the lower flow collecting component 703 extends out of the rectangular shell 701 and is connected to the input end of the heat storage device 9 through a pipeline. A plurality of rectangular and mutually parallel tributary components 704 are provided between the upper flow collecting component 702 and the lower flow collecting component 703. The tributary components 704 have a cavity inside and are connected to the inner cavities of the upper flow collecting component 702 and the lower flow collecting component 703. After the cold heat exchange oil in the cold storage device 8 enters the upper flow collecting component 702, it is distributed to the inner cavities of the plurality of tributary components 704 and then collected to the lower flow collecting component 703 and flows out.

[0083] A rectangular front collecting component 705 is provided on the front side wall of the inner cavity of the shell 701, one end of the front collecting component 705 extends out of the rectangular shell 701 and is connected to the output end of the air compressor 1 through a pipeline, and a rectangular rear collecting component 706 is provided on the rear side wall of the inner cavity of the shell 701, one end of the rear collecting component 706 extends out of the rectangular shell 701 and is connected to the input end of the air storage device 3 through a pipeline, and the front and rear ends of multiple branch components 704 are sealed and connected to the front collecting component 705 and the rear collecting component 706 respectively, and the gaps between each adjacent branch component 704 are connected to the inner cavity of the front collecting component 705 and the rear collecting component 706. The hot air generated by the air compressor 1 enters through the front collecting component 705 and is distributed to the cavity between the multiple branch components 704. After the hot air exchanges heat with the cold heat exchange oil, it is collected in the rear collecting component 706 and flows out.

[0084] The angle a between the tributary component 704 and the upper collecting component 702 along the water flow direction is 105°-165°, preferably 155°. The angle b between the tributary component 704 and the front collecting component 705 along the water flow direction is 105°-165°, preferably 155°. The different resistance losses of each branch pipe of the multi-branch parallel pipeline is the direct cause of the uneven branch flow distribution. The inclined setting can reduce the branch resistance loss of the branch part, and the consistent angle can make the branch resistance of each branch part the same.

[0085] The cross-sectional area of ​​the upper collecting component 702 across the water flow direction is larger than the sum of the inner cross-sectional areas of each branch component 704, and the cross-sectional area of ​​the front collecting component 705 across the water flow direction is larger than the sum of the gap cross-sectional areas between each branch component 704. When the total resistance loss of each branch pipe in the parallel pipeline is small, the ratio of the cross-sectional area of ​​the collecting pipe to the sum of the cross-sectional areas of each branch pipe is designed to be greater than 1, and the flow distribution uniformity of each branch pipe is better.

[0086] Specifically, the upper collecting component 702, the lower collecting component 703, the front collecting component 705 and the rear collecting component 706 are all provided with a square-circle reducing connection component 707 at the connection with the pipeline, so that they are convenient to connect and have better diversion and converging effects; the tributary component 704 is made of metal material, including one or more of carbon steel, alloy steel, copper and copper alloys, aluminum and aluminum alloys, titanium and titanium alloys, preferably alloy steel, to ensure that it has good thermal conductivity and relatively low cost.

[0087] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, and the external heat exchanger 11 is connected to an external water circulation system to provide heat for external users.

[0088] Specifically, a combustion chamber 12 is connected in parallel on the pipeline between the second heat exchanger 10 and the expander 4. When the heat storage device 9 is short of heat after supplying heat to the outside, the low-temperature compressed air released by the gas storage device 3 can be heated and expanded by combustion in the combustion chamber 12.

[0089] Working principle of an embodiment of the present invention: During the use of the present invention, when storing energy: the redundant power supply of the power grid or power generation facilities is used, the air is compressed by the motor 2 and the electric compressor 1, and the high-pressure gas generated has a high temperature, enters the first heat exchanger 7 to exchange heat with the cold medium from the cold storage device 8, and recovers heat. The low-temperature high-pressure gas after heat exchange enters the gas storage device 3 for storage, and the low-temperature medium increases in temperature after heat exchange and enters the heat storage device 9 for storage;

[0090] When releasing energy, the high-pressure air in the gas storage device 3 is released, and the high-pressure air enters the second heat exchanger 10 to exchange heat with the high-temperature medium from the heat storage device 9. After the heat exchange, the high-pressure air enters the expander 4 to expand and do work, driving the generator 5 to generate electricity. After the heat exchange, the high-temperature medium is cooled and enters the cold storage device 8 for storage.

[0091] An external heat supply circuit can also be formed by external hot gas 11, cold storage device 8 and heat storage device 9 to supply the stored heat to the outside. If the stored heat is insufficient, the heat can be supplemented by the combustion chamber to expand and do work.

Claims

1. A compressed air heat recovery and utilization system, characterized in that: include: An air compressor (1), the air compressor (1) being connected to an electric motor (2) for providing power thereto, and the electric motor (2) being connected to an external power supply facility; An expander (4), wherein the expander (4) is connected to a generator (5) and can provide power for the generator (5), and the generator (5) is connected to an external power facility; An air storage device (3), wherein the inlet end of the air storage device (3) is connected to the output end of the air compressor (1), and the outlet end of the air storage device (3) is connected to the input end of the expander (4); A heat storage heat exchange device (6), wherein the heat storage heat exchange device (6) can collect and store the heat of the air between the air compressor (1) and the gas storage device (3), and the heat storage heat exchange device (6) can supply the stored heat to the air between the gas storage device (3) and the expander (4) and / or external heating facilities.

2. A compressed air heat recovery and utilization system according to claim 1, characterized in that: The heat storage and heat exchange device (6) comprises a first heat exchanger (7), which is disposed on a pipeline between an air compressor (1) and an air storage device (3); an air output end of the air compressor (1) is connected to a hot medium inlet of the first heat exchanger (7); a hot medium outlet of the first heat exchanger (7) is connected to an inlet of the air storage device (3); a cold medium input end of the first heat exchanger (7) is connected to an output end of a cold storage device (8); a cold medium output end of the first heat exchanger (7) is connected to an input end of a heat storage device (9); an output end of the heat storage device (9) is connected to a hot medium input end of a second heat exchanger (10); a hot medium output end of the second heat exchanger (10) is connected to an input end of the cold storage device (8); a cold medium input end of the second heat exchanger (10) is connected to an outlet end of the air storage device (3); and a cold medium output end of the second heat exchanger (10) is connected to an input of an expander (4).

3. A compressed air heat recovery and utilization system according to claim 2, characterized in that: The cold storage device (8) and the heat storage device (9) are also connected to an external heat exchanger (11), and the external heat exchanger (11) is connected to an external water circulation system to provide heat for external users.

4. A compressed air heat recovery and utilization system according to claim 3, characterized in that: A combustion chamber (12) is provided in parallel on the pipeline between the second heat exchanger (10) and the expander (4).

5. A compressed air heat recovery and utilization system according to claim 2 or 4, characterized in that: The first heat exchanger (7) and the second heat exchanger (10) have the same structure.

6. A compressed air heat recovery and utilization system according to claim 5, characterized in that: The first heat exchanger (7) comprises a rectangular shell (701) with a cavity formed inside, an upper rectangular flow collecting component (702) is arranged on the upper side wall of the inner cavity of the shell (701), one end of the upper flow collecting component (702) extends out of the rectangular shell (701) and is connected to the output end of the cold storage device (8) through a pipeline, a lower rectangular flow collecting component (703) is arranged on the lower side wall of the inner cavity of the shell (701), one end of the lower flow collecting component (703) extends out of the rectangular shell (701) and is connected to the input end of the heat storage device (9) through a pipeline, and a plurality of rectangular and mutually parallel branch flow components (704) are arranged between the upper flow collecting component (702) and the lower flow collecting component (703), the inside of each branch flow component (704) is in the shape of a cavity and is connected to the inner cavities of the upper flow collecting component (702) and the lower flow collecting component (703); A rectangular front flow collecting component (705) is provided on the front side wall of the inner cavity of the shell (701), one end of the front flow collecting component (705) protrudes from the rectangular shell (701) and is connected to the output end of the air compressor (1) through a pipeline; a rectangular rear flow collecting component (706) is provided on the rear side wall of the inner cavity of the shell (701), one end of the rear flow collecting component (706) protrudes from the rectangular shell (701) and is connected to the input end of the air storage device (3) through a pipeline; front and rear ends of the plurality of branch flow components (704) are respectively sealed and connected to the front flow collecting component (705) and the rear flow collecting component (706); and the gaps between adjacent branch flow components (704) are connected to the inner cavities of the front flow collecting component (705) and the rear flow collecting component (706).

7. A compressed air heat recovery and utilization system according to claim 6, characterized in that: The angle a between the branch component (704) and the upper flow collecting component (702) along the water flow direction is 105°-165°, and the angle b between the branch component (704) and the front flow collecting component (705) along the water flow direction is 105°-165°.

8. A compressed air heat recovery and utilization system according to claim 7, characterized in that: The cross-sectional area of ​​the upper flow collecting component (702) transverse to the water flow direction is greater than the sum of the cross-sectional areas of the inner cavities of the branch flow components (704), and the cross-sectional area of ​​the front flow collecting component (705) transverse to the water flow direction is greater than the sum of the cross-sectional areas of the gaps between the branch flow components (704).

9. A compressed air heat recovery and utilization system according to claim 8, characterized in that: The upper flow collecting component (702), the lower flow collecting component (703), the front flow collecting component (705) and the rear flow collecting component (706) are all provided with a square-circle reducing connection component (707) at the connection points with the pipeline.

10. A compressed air heat recovery and utilization system according to claim 9, characterized in that: The branch component (704) is made of metal material, including one or more of carbon steel, alloy steel, copper and copper alloy, aluminum and aluminum alloy, titanium and titanium alloy.

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