Isothermal compressed air heat energy recycling system

Abstract

The utility model discloses an isothermal compressed air heat energy recycling system which comprises an isothermal compressor unit, an air inlet of the isothermal compressor unit is connected with a first mixed injection component, an air inlet of the first mixed injection component is connected with external air, and the output end of the isothermal compressor unit is connected with a first separation device. A gas output end of the first separation device is connected with a heat medium inlet end of a heat exchanger, a heat medium output end of the heat exchanger is connected with a gas inlet of a gas storage device, a gas outlet of the gas storage device is connected with a gas output end of a second mixed injection part, and an output end of the second mixed injection part is connected with an expansion machine; the output end of the expansion machine is connected with the input end of a second separation device. The compressed air energy storage 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] This utility model relates to an isothermal compressed air heat energy recovery and utilization system, belonging to the field of energy storage system technology. Background Technology

[0002] Compressed air energy storage systems (CASS) possess advantages such as large storage capacity and short construction period, and are considered one of the most promising large-scale energy storage technologies. Currently, CASS systems are mainly divided into isothermal compression and adiabatic compression, where the temperature changes during air compression differ. In isothermal compression, heat exchange temperature control is employed to ensure a quasi-isothermal process during compression and expansion; compression heat energy and pressure potential energy are decoupled and coupled in real time during compression and expansion, preventing significant temperature changes in the compressed air. Isothermal compression and expansion processes are difficult to achieve, resulting in low system efficiency. Therefore, the biggest challenge facing this technology is heat management, i.e., maintaining a constant temperature. To achieve heat management, an efficient heat exchange system needs to be designed. Therefore, we propose an isothermal compressed air heat recovery and utilization system. Utility Model Content

[0003] The purpose of this invention is to provide an isothermal compressed air heat energy recovery and utilization system. This invention, combined with a compressed air energy storage system, effectively utilizes the heat generated by compressed air, thereby saving production costs.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an isothermal compressed air heat energy recovery and utilization system, comprising: an isothermal compressor unit, wherein the air inlet of the isothermal compressor unit is connected to a first mixing injection component, the air inlet of the first mixing injection component is connected to external air, the output end of the isothermal compressor unit is connected to a first separation device, the gas output end of the first separation device is connected to the heat medium inlet end of a heat exchanger, the heat medium output end of the heat exchanger is connected to the air inlet of a gas storage device, the air outlet of the gas storage device is connected to the gas output end of a second mixing injection component, the output end of the second mixing injection component is connected to an expander, and the output end of the expander is connected to the input end of the second separation device;

[0005] It also includes a cold storage device and a heat storage device. The liquid inlet of the first mixing spray component and the cold medium input end of the heat exchanger are both connected to the output end of the cold storage device. The cold medium output end of the heat exchanger and the liquid output end of the first separation device are both connected to the input end of the heat storage device. The output end of the heat storage device is connected to the input end of the second mixing spray component. The liquid output end of the second separation device is connected to the input end of the cold storage device, and the output end of the second separation device is connected to the atmosphere.

[0006] In the aforementioned isothermal 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, which is connected to an external water circulation system to provide heat to external users.

[0007] In the aforementioned isothermal compressed air heat energy recovery and utilization system, the first heat exchanger includes a rectangular shell with an internal cavity. A rectangular upper flow collector is provided on the upper side wall of the inner cavity of the shell. One end of the upper flow collector extends out of the rectangular shell and is connected to the output end of a cold storage device through a pipe. A rectangular lower flow collector is provided on the lower side wall of the inner cavity of the shell. One end of the lower flow collector extends out of the rectangular shell and is connected to the input end of the heat storage device through a pipe. Multiple rectangular and parallel branch flow collectors are provided between the upper and lower flow collectors. The branch flow collectors are internally cavity-shaped and communicate with the inner cavities of the upper and lower flow collectors. The cold heat exchange oil in the cold storage device enters the upper flow collector, is distributed to the inner cavities of the multiple branch flow collectors, and then converges into the lower flow collector and flows out.

[0008] The inner wall of the housing has a rectangular front collector component, one end of which extends out of the rectangular housing and is connected to the output end of the isothermal compressor unit via a pipe. The inner wall of the housing has a rectangular rear collector component, one end of which extends out of the rectangular housing and is connected to the input end of the gas storage device via a pipe. The front and rear ends of the multiple branch components are respectively sealed to the front and rear collector components. The gaps between adjacent branch components are connected to the inner cavities of the front and rear collector components. The hot air generated by the isothermal compressor unit enters through the front collector component and is distributed to the cavities between the multiple branch components. After exchanging heat with the cold heat exchange oil, the hot air is collected in the rear collector component and flows out.

[0009] In the aforementioned isothermal compressed air heat energy recovery and utilization system, the angle α between the branch component and the upper collecting component along the water flow direction is 105°-165°, preferably 155°, and the angle b between the branch component and the front collecting component along the water flow direction is 105°-165°, preferably 155°. The different resistance losses of each branch pipe in a multi-branch parallel pipeline are the direct cause of uneven flow distribution in the branch pipes. Inclined setting can reduce the resistance loss of the branch pipes, and consistent angles can make the resistance of each branch pipe the same.

[0010] In the aforementioned isothermal compressed air heat energy recovery and utilization system, the cross-sectional area of ​​the upper collector component in the direction of water flow is greater than the sum of the cross-sectional areas of the inner cavities of each of the branch components, and the cross-sectional area of ​​the front collector component in the direction of water flow is greater than the sum of the cross-sectional areas of the gaps between each of the 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 collector pipe to the sum of the cross-sectional areas of each branch pipe is greater than 1 through design, and the flow distribution uniformity of each branch pipe is good.

[0011] In the aforementioned isothermal compressed air heat energy recovery and utilization system, the upper collector, lower collector, front collector, and rear collector are all equipped with square-to-round diameter reducing connectors at their connections with the pipeline, making them easy to connect and improving the diversion and convergence effects.

[0012] In the aforementioned isothermal compressed air heat energy recovery and utilization system, the branch component is made of a metallic material, including one or more of carbon steel, alloy steel, copper and copper alloys, aluminum and aluminum alloys, and titanium and titanium alloys, preferably alloy steel, which ensures good thermal conductivity while being relatively inexpensive.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] (1) This utility model effectively utilizes the heat generated by compressed air through a heat storage and heat exchange device, saving production costs and energy utilization rate. Furthermore, when combined with a compressed air energy storage system, it can both store energy and utilize excess heat, effectively improving the energy storage effect. At the same time, it can also recover and utilize thermal energy.

[0015] (2) The first and second heat exchangers of this utility model have novel structural designs. They are designed with inclined angles to reduce the resistance loss of each branch pipe. At the same time, the consistent angles make the resistance of each branch pipe the same. Furthermore, by designing the ratio of the cross-sectional area of ​​the collector pipe to the total cross-sectional area of ​​each branch pipe to be greater than 1, the flow distribution of each branch pipe can be made more uniform. The flow distribution of cold and hot media in each branch of the heat exchanger is uniform, which can effectively improve the heat exchange efficiency, reduce energy loss, and realize a highly efficient heat exchange system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system structure of this utility model;

[0017] Figure 2 This is a three-dimensional schematic diagram of the heat exchanger of this utility model;

[0018] Figure 3 yes Figure 2 Schematic diagram of the cross-section at point A;

[0019] Figure 4 This is a cross-sectional schematic diagram at point B of this utility model.

[0020] Reference numerals: 1-Isothermal compressor unit, 2-First mixing injection component, 3-Gas storage device, 4-Expander, 5-Second separation device, 6-Second mixing injection component, 7-Heat exchanger, 701-Rectangular shell, 702-Upper collector component, 703-Lower collector component, 704-Branch component, 705-Front collector component, 706-Rear collector component, 707-Square-round variable diameter connection component, 8-Cold storage device, 9-Heat storage device, 10-First separation device, 11-External heat exchanger.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0022] Embodiment 1 of this utility model: An isothermal compressed air heat energy recovery and utilization system, comprising: an isothermal compressor unit 1, the air inlet of the isothermal compressor unit 1 is connected to a first mixing injection component 2, the air inlet of the first mixing injection component 2 is connected to external air, the output end of the isothermal compressor unit 1 is connected to a first separation device 10, the gas output end of the first separation device is connected to the heat medium inlet end of a heat exchanger 7, the heat medium output end of the heat exchanger 7 is connected to the air inlet of a gas storage device 3, the air outlet of the gas storage device 3 is connected to the gas output end of a second mixing injection component 6, the output end of the second mixing injection component 6 is connected to an expander 4, and the output end of the expander 4 is connected to the input end of a second separation device 5;

[0023] It also includes a cold storage device 8 and a heat storage device 9. The liquid inlet of the first mixing injection component 2 and the cold medium input end of the heat exchanger 7 are both connected to the output end of the cold storage device 8. The cold medium output end of the heat exchanger 7 and the liquid output end of the first separation device 10 are both connected to the input end of the heat storage device 9. The output end of the heat storage device 9 is connected to the input end of the second mixing injection component 6. The liquid output end of the second separation device 5 is connected to the input end of the cold storage device 8, and the output end of the second separation device 5 is connected to the atmosphere.

[0024] It can recover the heat generated by the compressed air of the isothermal compressor unit 1 and feed the heat back to the compressed air expansion for energy supply and external heat-using facilities, such as external user heating. It has high heat exchange efficiency and good energy utilization.

[0025] Embodiment 2 of this utility model: An isothermal compressed air heat energy recovery and utilization system, comprising: an isothermal compressor unit 1, the air inlet of the isothermal compressor unit 1 is connected to a first mixing injection component 2, the air inlet of the first mixing injection component 2 is connected to external air, the output end of the isothermal compressor unit 1 is connected to a first separation device 10, the gas output end of the first separation device is connected to the heat medium inlet end of a heat exchanger 7, the heat medium output end of the heat exchanger 7 is connected to the air inlet of a gas storage device 3, the air outlet of the gas storage device 3 is connected to the gas output end of a second mixing injection component 6, the output end of the second mixing injection component 6 is connected to an expander 4, and the output end of the expander 4 is connected to the input end of a second separation device 5;

[0026] It also includes a cold storage device 8 and a heat storage device 9. The liquid inlet of the first mixing injection component 2 and the cold medium input end of the heat exchanger 7 are both connected to the output end of the cold storage device 8. The cold medium output end of the heat exchanger 7 and the liquid output end of the first separation device 10 are both connected to the input end of the heat storage device 9. The output end of the heat storage device 9 is connected to the input end of the second mixing injection component 6. The liquid output end of the second separation device 5 is connected to the input end of the cold storage device 8, and the output end of the second separation device 5 is connected to the atmosphere.

[0027] It can recover the heat generated by the compressed air of the isothermal compressor unit 1 and feed the heat back to the compressed air expansion for energy supply and external heat-using facilities, such as external user heating. It has high heat exchange efficiency and good energy utilization.

[0028] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, which is connected to an external water circulation system to provide heat to external users.

[0029] Embodiment 3 of this utility model: An isothermal compressed air heat energy recovery and utilization system, comprising: an isothermal compressor unit 1, the air inlet of the isothermal compressor unit 1 is connected to a first mixing injection component 2, the air inlet of the first mixing injection component 2 is connected to external air, the output end of the isothermal compressor unit 1 is connected to a first separation device 10, the gas output end of the first separation device is connected to the heat medium inlet end of a heat exchanger 7, the heat medium output end of the heat exchanger 7 is connected to the air inlet of a gas storage device 3, the air outlet of the gas storage device 3 is connected to the gas output end of a second mixing injection component 6, the output end of the second mixing injection component 6 is connected to an expander 4, and the output end of the expander 4 is connected to the input end of a second separation device 5;

[0030] It also includes a cold storage device 8 and a heat storage device 9. The liquid inlet of the first mixing injection component 2 and the cold medium input end of the heat exchanger 7 are both connected to the output end of the cold storage device 8. The cold medium output end of the heat exchanger 7 and the liquid output end of the first separation device 10 are both connected to the input end of the heat storage device 9. The output end of the heat storage device 9 is connected to the input end of the second mixing injection component 6. The liquid output end of the second separation device 5 is connected to the input end of the cold storage device 8, and the output end of the second separation device 5 is connected to the atmosphere.

[0031] It can recover the heat generated by the compressed air of the isothermal compressor unit 1 and feed the heat back to the compressed air expansion for energy supply and external heat-using facilities, such as external user heating. It has high heat exchange efficiency and good energy utilization.

[0032] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, which is connected to an external water circulation system to provide heat to external users.

[0033] The heat exchanger 7 includes a rectangular shell 701 with an internal cavity. A rectangular upper collector 702 is provided on the upper side wall of the inner cavity of the shell 701. One end of the upper collector 702 extends out of the rectangular shell 701 and is connected to the output end of the cold storage device 8 through a pipe. A rectangular lower collector 703 is provided on the lower side wall of the inner cavity of the shell 701. One end of the lower collector 703 extends out of the rectangular shell 701 and is connected to the input end of the heat storage device 9 through a pipe. Multiple rectangular and parallel branch members 704 are provided between the upper collector 702 and the lower collector 703. The branch members 704 are hollow inside and communicate with the inner cavities of the upper collector 702 and the lower collector 703. The cold heat exchange oil in the cold storage device 8 enters the upper collector 702, is distributed to the inner cavities of the multiple branch members 704, and then collects in the lower collector 703 and flows out.

[0034] A rectangular front collector 705 is provided on the front side wall of the inner cavity of the housing 701. One end of the front collector 705 extends out of the rectangular housing 701 and is connected to the output end of the isothermal compressor unit 1 through a pipe. A rectangular rear collector 706 is provided on the rear side wall of the inner cavity of the housing 701. One end of the rear collector 706 extends out of the rectangular housing 701 and is connected to the input end of the gas storage device 3 through a pipe. The front and rear ends of multiple branch components 704 are sealed to the front collector 705 and the rear collector 706, respectively. The gaps between adjacent branch components 704 are connected to the inner cavities of the front collector 705 and the rear collector 706. The hot air generated by the isothermal compressor unit 1 enters through the front collector 705 and is distributed to the cavity between the multiple branch components 704. After exchanging heat with the cold heat exchange oil, the hot air is collected in the rear collector 706 and flows out.

[0035] Embodiment 4 of this utility model: An isothermal compressed air heat energy recovery and utilization system, comprising: an isothermal compressor unit 1, the air inlet of the isothermal compressor unit 1 is connected to a first mixing injection component 2, the air inlet of the first mixing injection component 2 is connected to external air, the output end of the isothermal compressor unit 1 is connected to a first separation device 10, the gas output end of the first separation device is connected to the heat medium inlet end of a heat exchanger 7, the heat medium output end of the heat exchanger 7 is connected to the air inlet of a gas storage device 3, the air outlet of the gas storage device 3 is connected to the gas output end of a second mixing injection component 6, the output end of the second mixing injection component 6 is connected to an expander 4, and the output end of the expander 4 is connected to the input end of a second separation device 5;

[0036] It also includes a cold storage device 8 and a heat storage device 9. The liquid inlet of the first mixing injection component 2 and the cold medium input end of the heat exchanger 7 are both connected to the output end of the cold storage device 8. The cold medium output end of the heat exchanger 7 and the liquid output end of the first separation device 10 are both connected to the input end of the heat storage device 9. The output end of the heat storage device 9 is connected to the input end of the second mixing injection component 6. The liquid output end of the second separation device 5 is connected to the input end of the cold storage device 8, and the output end of the second separation device 5 is connected to the atmosphere.

[0037] It can recover the heat generated by the compressed air of the isothermal compressor unit 1 and feed the heat back to the compressed air expansion for energy supply and external heat-using facilities, such as external user heating. It has high heat exchange efficiency and good energy utilization.

[0038] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, which is connected to an external water circulation system to provide heat to external users.

[0039] The heat exchanger 7 includes a rectangular shell 701 with an internal cavity. A rectangular upper collector 702 is provided on the upper side wall of the inner cavity of the shell 701. One end of the upper collector 702 extends out of the rectangular shell 701 and is connected to the output end of the cold storage device 8 through a pipe. A rectangular lower collector 703 is provided on the lower side wall of the inner cavity of the shell 701. One end of the lower collector 703 extends out of the rectangular shell 701 and is connected to the input end of the heat storage device 9 through a pipe. Multiple rectangular and parallel branch members 704 are provided between the upper collector 702 and the lower collector 703. The branch members 704 are hollow inside and communicate with the inner cavities of the upper collector 702 and the lower collector 703. The cold heat exchange oil in the cold storage device 8 enters the upper collector 702, is distributed to the inner cavities of the multiple branch members 704, and then collects in the lower collector 703 and flows out.

[0040] A rectangular front collector 705 is provided on the front side wall of the inner cavity of the housing 701. One end of the front collector 705 extends out of the rectangular housing 701 and is connected to the output end of the isothermal compressor unit 1 through a pipe. A rectangular rear collector 706 is provided on the rear side wall of the inner cavity of the housing 701. One end of the rear collector 706 extends out of the rectangular housing 701 and is connected to the input end of the gas storage device 3 through a pipe. The front and rear ends of multiple branch components 704 are sealed to the front collector 705 and the rear collector 706, respectively. The gaps between adjacent branch components 704 are connected to the inner cavities of the front collector 705 and the rear collector 706. The hot air generated by the isothermal compressor unit 1 enters through the front collector 705 and is distributed to the cavity between the multiple branch components 704. After exchanging heat with the cold heat exchange oil, the hot air is collected in the rear collector 706 and flows out.

[0041] The angle α between the branch component 704 and the upper collecting component 702 along the water flow direction is 105°-165°, preferably 155°. The angle b between the branch 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 in a multi-branch parallel pipeline are the direct cause of uneven flow distribution in the branch pipes. Inclined setting can reduce the resistance loss of the branch pipes, and consistent angles can make the resistance of each branch pipe the same.

[0042] The cross-sectional area of ​​the upper manifold 702 in the direction of water flow is greater than the sum of the cross-sectional areas of the inner cavities of each branch manifold 704. The cross-sectional area of ​​the front manifold 705 in the direction of water flow is greater than the sum of the cross-sectional areas of the gaps between each branch manifold 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 manifold to the sum of the cross-sectional areas of each branch pipe is greater than 1 through design, and the flow distribution of each branch pipe is relatively uniform.

[0043] Specifically, the upper manifold 702, lower manifold 703, front manifold 705, and rear manifold 706 are all equipped with square-to-round diameter reducing connectors 707 at their connections with the pipes, making them easy to connect and improving the diversion and confluence effects; the branch component 704 is made of a metallic material, including one or more of carbon steel, alloy steel, copper and copper alloys, aluminum and aluminum alloys, and titanium and titanium alloys, preferably alloy steel, which ensures good thermal conductivity while being relatively inexpensive.

[0044] Specifically, the cold storage device 8 and the heat storage device 9 are also connected to an external heat exchanger 11, which is connected to an external water circulation system to provide heat to external users.

[0045] The working principle of one embodiment of this utility model is as follows: During the use of this utility model, when storing energy, redundant power is used to mix air and cold medium through the first mixing injection component 2 and inject them into the isothermal compressor unit 1 for compression. The cold medium absorbs the heat generated by the compressed air to achieve isothermal compression. The compressed mixed air enters the first separation device 10 for gas-liquid separation. The cold medium with increased temperature enters the heat storage device 9 for storage. The compressed air enters the heat exchanger 7 to further exchange heat with the cold medium from the cold storage device 8. The compressed air after heat exchange enters the gas storage device 3 for storage. The cold medium after heat exchange enters the heat storage device 9 for storage.

[0046] When releasing energy, the gas storage device 3 releases high-pressure gas. The high-pressure gas and the heat medium from the heat storage device 9 enter the expander 4 through the second mixing injection component 6. The expander 4 generates electricity. The mixed gas is separated by the second separation device 5. The gas is discharged to the atmosphere. After heat exchange, the heat medium enters the cold storage device 8 for storage.

Claims

1. An isothermal compressed air heat energy recovery and utilization system, characterized in that, include: An isothermal compressor unit (1) is provided, the inlet of which is connected to a first mixing injection component (2), the inlet of which is connected to external air, the output end of which is connected to a first separation device (10), the gas output end of which is connected to the heat medium inlet end of a heat exchanger (7), the heat medium output end of which is connected to the inlet of a gas storage device (3), the outlet of which is connected to the gas output end of a second mixing injection component (6), the output end of which is connected to an expander (4), and the output end of which is connected to the input end of a second separation device (5). It also includes a cold storage device (8) and a heat storage device (9). The liquid inlet of the first mixing spray component (2) and the cold medium input end of the heat exchanger (7) are both connected to the output end of the cold storage device (8). The cold medium output end of the heat exchanger (7) and the liquid output end of the first separation device (10) are both connected to the input end of the heat storage device (9). The output end of the heat storage device (9) is connected to the input end of the second mixing spray component (6). The liquid output end of the second separation device (5) is connected to the input end of the cold storage device (8), and the output end of the second separation device (5) is connected to the atmosphere.

2. The isothermal compressed air heat energy recovery and utilization system according to claim 1, characterized in that, The cold storage device (8) and the heat storage device (9) are also connected to an external heat exchanger (11), which is connected to an external water circulation system to provide heat to external users.

3. The isothermal compressed air heat energy recovery and utilization system according to claim 1, characterized in that, The heat exchanger (7) includes a rectangular shell (701) with an internal cavity. A rectangular upper flow collector (702) is provided on the upper side wall of the inner cavity of the shell (701). One end of the upper flow collector (702) extends out of the rectangular shell (701) and is connected to the output end of the cold storage device (8) through a pipe. A rectangular lower flow collector (703) is provided on the lower side wall of the inner cavity of the shell (701). One end of the lower flow collector (703) extends out of the rectangular shell (701) and is connected to the input end of the heat storage device (9) through a pipe. A plurality of rectangular and parallel branch flow members (704) are provided between the upper flow collector (702) and the lower flow collector (703). The branch flow members (704) are hollow inside and communicate with the inner cavities of the upper flow collector (702) and the lower flow collector (703). The inner cavity of the housing (701) is provided with a rectangular front collector (705) on the front side wall. One end of the front collector (705) extends out of the rectangular housing (701) and is connected to the output end of the isothermal compressor unit (1) through a pipe. The inner cavity of the housing (701) is provided with a rectangular rear collector (706) on the rear side wall. One end of the rear collector (706) extends out of the rectangular housing (701) and is connected to the input end of the gas storage device (3) through a pipe. The front and rear ends of the plurality of branch components (704) are respectively sealed to the front collector (705) and the rear collector (706). The gap between each adjacent branch component (704) is connected to the inner cavity of the front collector (705) and the rear collector (706).

4. The isothermal compressed air heat energy recovery and utilization system according to claim 3, characterized in that, The angle α between the tributary component (704) and the upper collector component (702) along the water flow direction is 105°-165°, and the angle b between the tributary component (704) and the front collector component (705) along the water flow direction is 105°-165°.

5. The isothermal compressed air heat energy recovery and utilization system according to claim 4, characterized in that, The cross-sectional area of ​​the upper flow collector (702) in the direction of water flow is greater than the sum of the cross-sectional areas of the inner cavities of each of the branch flow collectors (704), and the cross-sectional area of ​​the front flow collector (705) in the direction of water flow is greater than the sum of the cross-sectional areas of the gaps between each of the branch flow collectors (704).

6. The isothermal compressed air heat energy recovery and utilization system according to claim 5, characterized in that, The upper collector (702), lower collector (703), front collector (705), and rear collector (706) are all provided with square-to-round diameter reducing connectors (707) at their connections with the pipeline.

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