Combined power and cooling system

Abstract

The utility model provides an electricity and cold combined supply system which comprises an energy storage pipeline which comprises a first reservoir, a first compression device, a cooling device, an expansion valve and a second reservoir which are sequentially connected in series so as to store electric energy and cold energy through the compression process and phase change of an energy storage medium; and the energy release pipeline comprises a second reservoir, a power device, an evaporator, an expansion device and a first reservoir which are sequentially connected in series, so that electric energy and cold energy are released by utilizing the phase change process and the expansion process of the energy storage medium. In this way, energy can be stored in the valley period and released in the peak period, so that electric charge is saved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a combined power and cooling system. Background Art

[0002] In addition to electricity, industrial production processes often require a large amount of cold energy to cool facilities, equipment or products. For example, when a data center cabinet is working, it will generate a lot of heat, which must be cooled and dissipated in a timely and continuous manner. Conventional cooling equipment such as refrigerators and air conditioners use electric refrigeration systems, which convert electrical energy into cold energy for cooling. They run continuously, consume a lot of electricity, have high electricity costs, and cannot respond to the country's call for staggered electricity consumption and enjoy the benefits of peak and valley electricity prices. Utility Model Content

[0003] In view of this, the present application provides a combined power and cooling system that can respond to the country's call for staggered electricity consumption, store electricity and cold energy during off-peak periods, and release cold energy and generate electricity during peak periods, thereby saving electricity costs.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A combined power and cooling system, comprising:

[0006] The energy storage pipeline comprises a first reservoir, a first compression device, a cooling device, an expansion valve and a second reservoir which are sequentially connected in series, so as to utilize the compression process and phase change process of the energy storage medium to store electric energy and cold energy;

[0007] The energy release pipeline includes the second reservoir, the power device, the evaporator, the expansion device and the first reservoir which are connected in series in sequence, so as to release electric energy and cold energy by utilizing the phase change process and expansion process of the energy storage medium.

[0008] Optionally, in the above-mentioned combined power and cooling system, the second reservoir and the evaporator are connected by a first pipeline, so that the liquid energy storage medium in the second reservoir releases cold through the evaporator and changes phase from liquid to gas, and returns to the second reservoir, or enters the first reservoir after expansion and power generation through the expansion device.

[0009] Optionally, in the above-mentioned combined power and cooling system, a heat storage device is connected in series between the first compression device and the cooling device, and the heat storage medium in the heat storage device is used to store thermal energy in the energy storage stage and release thermal energy in the energy release stage.

[0010] Optionally, in the above-mentioned combined power and cooling system, a second compression device is arranged between the heat storage device and the cooling device, and the second reservoir is connected to the second compression device through a second pipeline, so that the gaseous energy storage medium in the second reservoir passes through the second compression device, the cooling device and the expansion valve in sequence to convert the gaseous energy storage medium in the second reservoir into liquid and store it in the second reservoir.

[0011] Optionally, in the above-mentioned combined power and cooling system, the design pressure of the second reservoir is A, and the saturation pressure of the energy storage medium corresponding to the temperature of the required cold energy is B, wherein A=1.5B.

[0012] Optionally, in the above-mentioned power-cooling combined supply system, the heat storage device includes a cold tank, a hot tank, a heat storage heat exchanger and a heat release heat exchanger;

[0013] Among them, the heat storage heat exchanger absorbs the heat of the energy storage medium compressed by the first compression device, and transfers the heat to the heat storage medium output from the cold tank to the hot tank; the heat release heat exchanger is used to transfer the heat of the heat storage medium output from the hot tank to the cold tank to the energy storage medium output from the evaporator.

[0014] Optionally, in the above-mentioned power-cooling combined supply system, the energy storage medium is carbon dioxide.

[0015] Optionally, in the above-mentioned power-cooling combined supply system, the first compression device includes one compressor or a plurality of compressors connected in series or in parallel; and / or,

[0016] The expansion device includes one expander or a plurality of expanders connected in series or in parallel.

[0017] The present application provides an electric-cooling combined supply system, in which an energy storage pipeline is connected to an energy release pipeline. During off-peak hours, energy is stored by utilizing the compression process and phase change of the energy storage medium to store electric energy and cold energy. During peak hours, energy is released by utilizing the phase change process and expansion process of the energy storage medium to release electric energy and cold energy. In this way, the national call for staggered electricity consumption is responded to to save electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a power-cooling combined supply system provided in an embodiment of the present application.

[0020] exist Figure 1 middle:

[0021] 1. First reservoir; 2. First compression device; 21. First motor; 3. Cooling device; 4. Expansion valve; 5. Second reservoir; 6. Power device; 7. Evaporator; 8. Expansion device; 81. Generator; 9. First pipeline; 10. Heat storage device; 101. Cold tank; 102. Hot tank; 103. Heat storage heat exchanger; 104. Heat release heat exchanger; 11. Second compression device; 111. Second motor; 12. Second pipeline. DETAILED DESCRIPTION

[0022] The present application provides an electric-cooling combined supply system, which can respond to the national call for staggered electricity consumption, store electric energy and cold energy during off-peak periods, and release cold energy and generate electricity during peak periods, thereby saving electricity costs.

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] like Figure 1 As shown, an embodiment of the present application provides an electric-cooling combined supply system, which includes an energy storage pipeline and an energy release pipeline, wherein the energy storage pipeline includes a first reservoir 1, a first compression device 2, a cooling device 3, an expansion valve 4, and a second reservoir 5 connected in series in sequence, so as to utilize the compression process and phase change process of the energy storage medium to store electric energy and cold energy; the energy release pipeline includes a second reservoir 5, a power device 6, an evaporator 7, an expansion device 8 and a first reservoir 1 connected in series in sequence, so as to utilize the phase change process and expansion process of the energy storage medium to release electric energy and cold energy, thereby helping the power grid to reduce peak loads and fill valleys and save electric energy.

[0025] It should be noted that the state of the energy storage medium in the first reservoir 1 can be a pure gas state, a gas-liquid mixed state or a gas-liquid-solid mixed state, and the specific state depends on the actual situation.

[0026] It should also be noted that the cooling device 3 can be but is not limited to a cooler; the power device 6 can be but is not limited to a pump; the first compression device 2 is connected to the first motor 21; and the expansion device 8 is connected to a generator 81.

[0027] Furthermore, the second reservoir 5 and the evaporator 7 are connected through the first pipeline 9, so that the liquid energy storage medium in the second reservoir 5 changes phase from liquid to gas after releasing cooling through the evaporator 7, and returns to the second reservoir 5, or enters the first reservoir 1 after expanding and generating electricity through the expansion device 8. The liquid energy storage medium passes through the evaporator 7, absorbs the heat of the surrounding target that needs to be cooled, thereby reducing the temperature of the target (i.e., completing cooling), and the energy storage medium changes from liquid to gas and enters the second reservoir 5 for storage, or, during the peak period, after the energy storage medium passes through the evaporator 7, that is, after changing from liquid to gas, it enters the expansion device 8 for expansion and power generation, and the energy storage medium after power generation enters the first reservoir 1 for storage. The setting of the first pipeline 9 enables the cooling process to be carried out separately when the power-cooling combined supply system needs to release cooling and does not need to generate electricity, thereby avoiding unnecessary energy waste.

[0028] It should be noted that the state of the energy storage medium in the second storage tank 5 is a gas-liquid mixed state, and the cooling process is carried out all the time during the energy storage stage and the energy release stage.

[0029] In an optional embodiment, a heat storage device 10 is connected in series between the first compression device 2 and the cooling device 3. The heat storage medium in the heat storage device 10 is used to store heat energy in the energy storage stage and release heat energy in the energy release stage. Specifically, in the energy storage stage, the heat storage medium absorbs the heat of the energy storage medium compressed and pressurized by the first compression device 2, and stores the heat. In the energy release stage, the heat storage medium transfers the heat stored in the energy storage stage to the phase change medium after releasing the cold energy to increase the temperature, so that the energy is fully utilized, the energy utilization efficiency is improved, and the power generation is increased.

[0030] It should be noted that the heat storage medium includes but is not limited to thermal oil, molten salt or water.

[0031] Furthermore, a second compression device 11 is provided between the heat storage device 10 and the cooling device 3, and the second storage tank 5 is connected to the second compression device 11 through a second pipeline 12, so that the gaseous energy storage medium in the second storage tank 5 passes through the second compression device 11, the cooling device 3 and the expansion valve 4 in sequence, so as to convert the gaseous energy storage medium in the second storage tank 5 into a liquid state and store it in the second storage tank 5. The reason why the second compression device 11 is provided after the heat storage device 10 is that the second compression device 11 is used to compress the gaseous energy storage medium from the second storage tank 5, and the temperature of the gaseous energy storage medium in the second storage tank 5 is relatively low. If the second compression device 11 is provided before the heat storage device 10, the low-temperature energy storage medium in the second storage tank 5 is mixed with the high-temperature energy storage medium after the first compression device 2, and the heat released by the mixed energy storage medium in the heat storage device 10 will be reduced, thereby affecting the energy storage efficiency. At the same time, if the second compression device 11 is not provided, but the cooling process is always in progress, the volume requirement for the second storage tank 5 is relatively high. It can be seen that the provision of the second compression device 11 not only improves the energy storage efficiency, but also reduces the volume requirement of the second storage tank 5, thereby optimizing the power-cooling combined supply system.

[0032] In addition, because the cooling process is always ongoing, there is always a portion of the liquid energy storage medium that is converted into gas after cooling. The setting of the first pipeline 9 can timely convert the gaseous energy storage medium into liquid energy storage medium and store it in the second storage tank 5, thereby improving the energy storage efficiency.

[0033] It should be noted that the second compression device 11 is connected to a second electric motor 111 .

[0034] In an optional embodiment, the design pressure of the second reservoir 5 is A, and the saturation pressure of the energy storage medium corresponding to the temperature of the required cold energy is B, where A=1.5B. That is, the pressure range of the second energy storage is determined by the saturation pressure of the phase change medium corresponding to the temperature of the required cold energy, thereby avoiding the situation where the pressure of the selected second reservoir 5 is too small, resulting in a short service life of the second reservoir 5 or inability to withstand pressure, or avoiding the situation where the pressure of the selected second reservoir 5 is too large, resulting in a high cost of purchasing the second reservoir 5, causing unnecessary waste. It can be seen that the above-mentioned principle of selecting the pressure range of the second reservoir 5 is conducive to selecting a second reservoir 5 with a matching pressure to extend the service life and save the cost.

[0035] Furthermore, the heat storage device 10 includes a cold tank 101, a hot tank 102, a heat storage heat exchanger 103 and a heat release heat exchanger 104; wherein the heat storage heat exchanger 103 absorbs the heat of the energy storage medium compressed by the first compression device 2, and transfers the heat to the heat storage medium output from the cold tank 101 to the hot tank 102; the heat release heat exchanger 104 is used to transfer the heat of the heat storage medium output from the hot tank 102 to the cold tank 101 to the energy storage medium output from the evaporator 7. It can be seen that the heat storage and heat release principles of the above-mentioned heat storage device 10 are simple, which not only realizes the full utilization of energy, but also improves the power generation efficiency.

[0036] In an optional embodiment, the energy storage medium is carbon dioxide. Carbon dioxide is often used in energy storage systems, which has the following advantages: carbon dioxide energy storage has a higher energy density in a liquid state, which means that more energy can be stored in the same volume; the recycling of carbon dioxide helps to reduce emissions in the atmosphere, which meets the requirements of environmental protection and sustainable development; the medium used in carbon dioxide energy storage technology is non-toxic and non-flammable, so it has higher safety; carbon dioxide can be liquefied by increasing pressure at room temperature, the storage conditions are relatively simple, and the cost is low.

[0037] In another optional embodiment, the energy storage medium may also be ammonia.

[0038] In an optional embodiment, the first compression device 2 includes one compressor or multiple compressors connected in series or in parallel; and / or the expansion device 8 includes one expander or multiple expanders connected in series or in parallel. In this way, the model and number of the compressor and the expander can be selected according to actual needs, thereby increasing the flexibility of the energy storage system.

[0039] It should be noted that the second compression device 11 includes one compressor or a plurality of compressors connected in series or in parallel.

[0040] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0041] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0042] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0043] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0044] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0045] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A combined power and cooling system, characterized in that: include: An energy storage pipeline comprises a first reservoir (1), a first compression device (2), a cooling device (3), an expansion valve (4) and a second reservoir (5) which are sequentially connected in series, so as to utilize the compression process and phase change process of the energy storage medium to store electric energy and cold energy; The energy release pipeline comprises the second reservoir (5), a power device (6), an evaporator (7), an expansion device (8) and the first reservoir (1) which are sequentially connected in series, so as to release electric energy and cold energy by utilizing the phase change process and expansion process of the energy storage medium.

2. The combined power and cooling system according to claim 1, characterized in that: The second reservoir (5) and the evaporator (7) are connected via a first pipeline (9), so that the liquid energy storage medium in the second reservoir (5) is released through the evaporator (7) to change from liquid to gaseous state and return to the second reservoir (5), or expands and generates electricity through the expansion device (8) and then enters the first reservoir (1).

3. The combined power and cooling system according to claim 1, characterized in that: A heat storage device (10) is connected in series between the first compression device (2) and the cooling device (3); the heat storage medium in the heat storage device (10) is used to store heat energy in the energy storage stage and to release heat energy in the energy release stage.

4. The combined power and cooling system according to claim 3, characterized in that: A second compression device (11) is provided between the heat storage device (10) and the cooling device (3), and the second reservoir (5) is connected to the second compression device (11) via a second pipeline (12), so that the gaseous energy storage medium in the second reservoir (5) passes through the second compression device (11), the cooling device (3) and the expansion valve (4) in sequence, so as to convert the gaseous energy storage medium in the second reservoir (5) into a liquid state and store it in the second reservoir (5).

5. The combined power and cooling system according to claim 2, characterized in that: The design pressure of the second reservoir (5) is A, and the saturation pressure of the energy storage medium corresponding to the temperature of the required cold energy is B, wherein A=1.5B.

6. The combined power and cooling system according to claim 3, characterized in that: The heat storage device (10) comprises a cold tank (101), a hot tank (102), a heat storage heat exchanger (103) and a heat release heat exchanger (104); The heat storage heat exchanger (103) absorbs the heat of the energy storage medium compressed by the first compression device (2), and transfers the heat to the heat storage medium output from the cold tank (101) to the hot tank (102); the heat release heat exchanger (104) is used to transfer the heat of the heat storage medium output from the hot tank (102) to the cold tank (101) to the energy storage medium output from the evaporator (7).

7. The combined power and cooling system according to claim 1, characterized in that: The energy storage medium is carbon dioxide.

8. The combined power and cooling system according to claim 1, characterized in that: The first compression device (2) comprises one compressor or a plurality of compressors connected in series or in parallel; and / or, The expansion device (8) comprises an expansion machine or a plurality of expansion machines connected in series or in parallel.

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