System for coupling gas supply to gas compression energy storage power generation

Abstract

This invention provides a gas compression energy storage and power generation system coupled with gas supply, belonging to the technical field of gas compression energy storage and power generation and gas supply. It includes: a gas compression storage system, a first power generation system, and a first gas supply system arranged along the gas flow direction; the gas compression storage system is used to compress and store gas using excess electrical energy when the power generation of the second power generation system exceeds the power consumption of the grid; the first power generation system is used to generate electricity using the compressed gas stored in the gas compression storage system when the power generation of the second power generation system does not meet the power consumption of the grid, so that the total power generation of the first and second power generation systems meets the power consumption of the grid; the first gas supply system is used to produce oxygen, nitrogen, and mixed compressed gas using the gas generated after power generation. This invention couples gas compression energy storage and power generation with gas supply, resulting in a simple system structure, energy saving, improved energy utilization, and the achievement of green and sustainable development.

Description

Technical Field

[0001] This invention relates to the fields of gas compression energy storage power generation and gas supply technology, and specifically to a system for gas compression energy storage power generation coupled with gas supply. Background Technology

[0002] Currently, renewable energy generation capacity accounts for more than 50% of total power generation. However, due to the volatility and intermittency of renewable energy sources such as wind and solar power, the controllability of the system decreases and safety risks increase as the proportion of wind and solar power integrated into the power system increases. This makes it very difficult to absorb new energy sources, mainly wind and solar power, resulting in significant wind and solar power curtailment and energy waste.

[0003] The development of energy storage technology is crucial for ensuring the large-scale development of clean energy and the safe and economical operation of the power grid in the future. Energy storage technology can add an energy storage component to the power system, improving the flexibility, economy, and security of grid operation, especially mitigating the uncertainties brought about by the integration of large-scale clean energy generation into the grid. Compressed air energy storage, with its advantages of large scale, high efficiency, low cost, and environmental friendliness, is considered one of the most promising large-scale energy storage technologies.

[0004] In addition, compressed air, oxygen, and nitrogen are all essential basic products for industrial and civil use, and all require a large amount of electrical energy in actual production processes. Combining compressed air energy storage technology with air separation units and centralized compressed air supply systems enables the storage and release of electrical energy while ensuring the continuous and stable operation of the air separation system and centralized compressed air supply system, reducing the impact of new energy power on the power grid, and ensuring the safe operation of the power grid. Summary of the Invention

[0005] The purpose of this invention is to provide a gas compression energy storage and power generation coupled gas supply system to solve the problem that the consumption of new energy sources, mainly wind power and photovoltaic power, is very difficult, resulting in a large amount of wind and solar power curtailment and energy waste.

[0006] To achieve the above objectives, embodiments of the present invention provide a gas compression energy storage and power generation coupled gas supply system, the system comprising:

[0007] A gas compression and storage system, a first power generation system, and a first gas supply system are arranged sequentially along the gas flow direction;

[0008] The gas compression and storage system is used to compress and store gas using excess electrical energy when the power generation of the second power generation system exceeds the power consumption of the power grid.

[0009] The first power generation system is used to generate electricity using compressed gas stored in the gas compression and storage system when the power generation of the second power generation system is insufficient to meet the power consumption of the power grid, so that the total power generation of the first power generation system and the second power generation system meets the power consumption of the power grid.

[0010] The first gas supply system is used to produce oxygen, nitrogen and mixed compressed gas using the gas generated from electricity generation.

[0011] Optionally, the second power generation system includes at least one of a wind power generation system, a solar power generation system, a tidal power generation system, and a thermal power generation system.

[0012] Optionally, the gas compression storage system includes:

[0013] A multi-stage compressor, connected to the second power generation system, is used to compress gas using electrical energy generated by the second power generation system;

[0014] A gas storage device is connected to the outlet of the multi-stage compressor and is used to store the compressed gas obtained by the multi-stage compressor.

[0015] Optionally, the first power generation system includes:

[0016] A multi-stage expander is connected to the outlet of the gas storage device and is used to drive a generator to generate electricity by utilizing the internal energy of compressed gas.

[0017] Optionally, the system further includes:

[0018] A hot and cold cycle system is used to cool the compressed gas entering the gas storage device during the gas compression process, and to heat the compressed gas entering the multi-stage expander during the process of generating electricity using the compressed gas.

[0019] Optionally, the cold and heat recycling system includes:

[0020] Multistage heat exchangers, thermal storage tanks, multistage reheaters, and cold storage tanks that form a circulation path along the direction of medium flow;

[0021] The inlet end of the multi-stage heat exchanger is connected to the multi-stage compressor, and the outlet end is connected to the gas storage device, which is used to cool the compressed gas entering the gas storage device during the gas compression process.

[0022] The inlet of the multi-stage reheater is connected to the gas storage device, and the outlet is connected to the multi-stage expander. It is used to heat the compressed gas entering the multi-stage expander during the process of generating electricity using compressed gas.

[0023] Optionally, the first gas supply system includes:

[0024] The system comprises a first gas supply subsystem, a second gas supply subsystem, and a nitrogen-oxygen supply subsystem. The first gas supply subsystem and the second gas supply subsystem are both used to prepare mixed compressed gas, and the nitrogen-oxygen supply subsystem is used to prepare oxygen and nitrogen.

[0025] The air inlet of the first gas supply subsystem is connected to the first power generation system via a first pipeline;

[0026] The air inlet of the nitrogen and oxygen supply subsystem is connected to the first power generation system through a second pipe, and the air inlet of the nitrogen and oxygen supply subsystem is connected to the first pipe through a third pipe.

[0027] The air inlet of the second air supply subsystem is connected to the nitrogen and oxygen supply subsystem via a fourth pipe.

[0028] Optionally, the first gas supply subsystem includes:

[0029] The filter unit has its inlet end connected to the outlet end of the first power generation system via a first pipe. It is used to filter the gas after power generation to form a mixed compressed gas. The outlet end of the filter unit is connected to the user end of the mixed compressed gas.

[0030] The nitrogen and oxygen supply subsystem includes:

[0031] A precooling unit, a purification unit, and a fractionation unit are arranged sequentially along the gas flow direction. The inlet of the precooling unit is connected to the outlet of the first power generation system through a second pipe and is connected to the first pipe through a third pipe.

[0032] The precooling unit is used to cool the gas entering the first gas supply system;

[0033] The purification unit is used to dry and remove impurities from the cooled gas;

[0034] The fractionation unit is used to fractionate the dried and purified gas to obtain oxygen and nitrogen. The gas outlet of the fractionation unit is connected to the oxygen user terminal and the nitrogen user terminal, respectively.

[0035] The second gas supply subsystem includes:

[0036] The sub-compressor has its inlet end connected to the outlet end of the purification unit via a fourth pipe. It is used to generate a mixed compressed gas using the dried and purified gas. The outlet end of the sub-compressor is connected to the user end of the mixed compressed gas.

[0037] Optionally, when the difference between the gas consumption at the mixed compressed gas user end and the total gas consumption at the oxygen user end and the nitrogen user end is less than or equal to a preset threshold, gas is supplied to the filter unit through the first pipe to prepare mixed compressed gas, and gas is supplied to the nitrogen and oxygen supply subsystem through the second pipe to prepare oxygen and nitrogen.

[0038] When the gas consumption at the mixed compressed gas user end is greater than the total gas consumption at the oxygen user end and the difference is greater than a preset threshold, gas is supplied to the filter unit through the first pipe to prepare mixed compressed gas, and gas is supplied to the nitrogen and oxygen supply subsystem through the third pipe to prepare oxygen and nitrogen.

[0039] When the total gas consumption of the oxygen user and nitrogen user exceeds the gas consumption of the mixed compressed gas user and the difference is greater than a preset threshold, gas is supplied to the nitrogen and oxygen supply subsystem through the second pipeline to prepare oxygen and nitrogen, and gas is supplied to the sub-compressor through the fourth pipeline to prepare mixed compressed gas.

[0040] Optionally, the system further includes:

[0041] The second gas supply system is connected to the outlet of the gas compression and storage system. It is used to prepare oxygen, nitrogen and mixed compressed gas by utilizing the excess electrical energy generated by the second power generation system and the compressed gas stored in the gas compression and storage system when the power generation of the second power generation system is greater than the power consumption of the power grid.

[0042] This technical solution couples gas compression energy storage power generation with gas supply, achieving centralized supply of oxygen, nitrogen, and mixed compressed gas while simultaneously realizing energy storage power generation. The system has a simple structure, improves grid flexibility, saves energy, increases energy utilization, and achieves green and sustainable development.

[0043] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is a schematic diagram of the overall structure of the first gas compression energy storage and power generation coupled gas supply system provided by the present invention;

[0046] Figure 2 This is a schematic diagram of the specific structure of the first gas compression energy storage and power generation coupled gas supply system provided by the present invention;

[0047] Figure 3 This is a schematic diagram of the specific structure of the first gas supply system provided by the present invention;

[0048] Figure 4 This is a schematic diagram of the overall structure of the second gas compression energy storage and power generation coupled gas supply system provided by the present invention;

[0049] Figure 5 This is a schematic diagram of the specific structure of the second gas compression energy storage and power generation coupled gas supply system provided by the present invention.

[0050] Explanation of reference numerals in the attached figures

[0051] 1-Gas compression and storage system; 2-First power generation system; 3-First gas supply system;

[0052] 4-Second power generation system; 5-Heat and cold cycle utilization system; 6-Mixed compressed gas user end;

[0053] 7-Oxygen user terminal; 8-Nitrogen user terminal; 9-Second gas supply system;

[0054] 11-Compressor; 12-Gas storage device; 21-Expander;

[0055] 22-Generator; 31-First gas supply subsystem; 32-Second gas supply subsystem;

[0056] 33-Nitrogen and oxygen supply subsystem; 51-Heat exchanger; 52-Heat storage tank;

[0057] 53 - Reheater; 54 - Cold storage tank; 301 - First pipeline;

[0058] 302 - Second pipe; 303 - Third pipe; 304 - Fourth pipe;

[0059] 311 - Filter unit; 321 - Sub-compressor; 331 - Pre-cooling unit;

[0060] 332 - Purification unit; 333 - Fractionation unit. Detailed Implementation

[0061] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0062] In the embodiments of the present invention, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use.

[0063] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0064] The terms "parallel" and "perpendicular" do not mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be completely parallel, but that it can be slightly tilted.

[0065] The terms "horizontal," "vertical," and "sag" do not imply that a component must be absolutely horizontal, vertical, or sagging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0066] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.

[0067] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] Figure 1 This is a schematic diagram of the overall structure of the first gas compression energy storage and power generation coupled gas supply system provided by the present invention; Figure 2 This is a schematic diagram of the specific structure of the first gas compression energy storage and power generation coupled gas supply system provided by the present invention; Figure 3 This is a schematic diagram of the specific structure of the first gas supply system provided by the present invention; Figure 4 This is a schematic diagram of the overall structure of the second gas compression energy storage and power generation coupled gas supply system provided by the present invention; Figure 5 This is a schematic diagram of the specific structure of the second gas compression energy storage and power generation coupled gas supply system provided by the present invention.

[0069] Example 1

[0070] In this embodiment, the present invention provides a gas compression energy storage and power generation system coupled with gas supply, such as... Figure 1 As shown, the system includes:

[0071] A gas compression and storage system 1, a first power generation system 2, and a first gas supply system 3 are arranged sequentially along the gas flow direction;

[0072] The gas compression and storage system 1 is used to compress and store gas using excess electrical energy when the power generation of the second power generation system 4 is greater than the power consumption of the power grid.

[0073] The first power generation system 2 is used to generate electricity using compressed gas stored in the gas compression and storage system 1 when the power generation of the second power generation system 4 is insufficient to meet the power consumption of the power grid, so that the total power generation of the first power generation system 2 and the second power generation system 4 meets the power consumption of the power grid.

[0074] The first gas supply system 3 is used to produce oxygen, nitrogen, and mixed compressed gas using the gas generated from electricity generation.

[0075] Specifically, in this embodiment, when the power generation of the second power generation system 4 exceeds the power consumption of the power grid, there is excess power that cannot be absorbed. Therefore, the gas compression and storage system 1 is used to compress and store the excess power to utilize the excess power. In addition, when the power generation of the second power generation system 4 is less than the power consumption of the power grid, the generated power does not meet the power consumption of the power grid, resulting in a power shortage. At this time, the first power generation system 2 uses the compressed gas stored in the gas compression and storage system 1 to generate power, so that the total power generation of the first power generation system 2 and the second power generation system 4 meets the power consumption of the power grid. Since the compressed gas still has a certain pressure after generating power, the gas passing through the first power generation system 2 is transported to the first gas supply system 3 for further utilization to produce oxygen, nitrogen and mixed compressed gas. In this way, energy utilization can be further improved, thereby reducing energy waste.

[0076] The energy storage and energy release processes of a compressed air energy storage system are relatively independent processes. The energy storage and energy release times can be configured in a 1:1 ratio or in an N:1 ratio according to actual needs.

[0077] Furthermore, the second power generation system 4 includes at least one of the following: a wind power generation system, a solar power generation system, a tidal power generation system, and a thermal power generation system.

[0078] The relevant structures and methods for wind power generation, solar photovoltaic power generation, tidal power generation and thermal power generation are existing technologies known to those skilled in the art, and will not be elaborated here.

[0079] Furthermore, such as Figure 2 As shown, the gas compression and storage system 1 includes:

[0080] A multi-stage compressor 11 is connected to a second power generation system 4 and is used to compress gas using the electrical energy generated by the second power generation system 4.

[0081] The gas storage device 12 is connected to the outlet end of the multi-stage compressor 11 and is used to store the compressed gas obtained by the multi-stage compressor 11.

[0082] Specifically, in this embodiment, the multi-stage compressor 11 is configured as a two-stage compressor, including a first compressor and a second compressor, such as... Figure 2 As shown, atmospheric pressure gas first enters the first-stage compressor, is compressed by the first-stage compressor, and then enters the second-stage compressor for further compression. After compression by the second-stage compressor, it is then delivered to the gas storage device 12 for storage. The gas storage device 12 can be configured as a gas storage tank, which can withstand relatively high pressure.

[0083] Furthermore, such as Figure 2 As shown, the first power generation system 2 includes:

[0084] The multi-stage expander 21 is connected to the outlet of the gas storage device 12 and is used to drive the generator 22 to generate electricity by using the internal energy of the compressed gas.

[0085] Specifically, in this embodiment, the multi-stage expander 21 is configured as a two-stage expander, including a first expander and a second expander, such as... Figure 2 As shown, the compressed gas in the gas storage device 12 first enters the first expander, performs work in the first expander, and then enters the second expander to perform work again. After being expanded twice in the expanders, it is then delivered to the first power generation system 2 to produce oxygen, nitrogen, and mixed compressed gas. Before entering the expander 21, the compressed gas pressure is reduced to meet the inlet pressure of the expander 21 through a throttle valve.

[0086] Furthermore, such as Figure 1-2 As shown, the system also includes:

[0087] The cold and heat recycling system 5 is used to cool the compressed gas entering the gas storage device 12 during the gas compression process, and to heat the compressed gas entering the multi-stage expander 21 during the process of generating electricity using the compressed gas.

[0088] Furthermore, such as Figure 2 As shown, the cold and heat recycling system 5 includes:

[0089] A multi-stage heat exchanger 51, a heat storage tank 52, a multi-stage reheater 53, and a cold storage tank 54 that form a circulation path along the direction of medium flow;

[0090] The inlet end of the multi-stage heat exchanger 51 is connected to the multi-stage compressor 11, and the outlet end is connected to the gas storage device 12. It is used to cool the compressed gas entering the gas storage device 12 during the gas compression process.

[0091] The inlet end of the multi-stage reheater 53 is connected to the gas storage device 12, and the outlet end is connected to the multi-stage expander 21. It is used to heat the compressed gas entering the multi-stage expander 21 during the process of generating electricity using compressed gas.

[0092] Specifically, since gas releases heat during compression, it has a high temperature, which is unfavorable for storage. Therefore, a multi-stage heat exchanger 51 is used to exchange heat generated during gas compression with a medium within the heat exchanger 51, thus cooling the compressed gas. Simultaneously, the heated medium is transported to a heat storage tank 52 for storage, to be utilized during subsequent gas expansion and heat absorption, thereby improving power generation efficiency. In this embodiment, the multi-stage heat exchanger 51 is configured as a two-stage system, including a first heat exchanger and a second heat exchanger, both connected to the heat storage tank 52 and the cold storage tank 54. This allows the heated medium, after heat exchange in the first and second heat exchangers, to enter the heat storage tank 52 for storage. The flow direction of the compressed gas is sequential: first compressor, first heat exchanger, second compressor, second heat exchanger. The compressed gas enters the gas storage device 12 only after passing through the multi-stage heat exchangers.

[0093] Specifically, since gas absorbs heat during expansion and work, a multi-stage reheater 53 is installed to increase power generation efficiency. Before the compressed gas expands and performs work, the medium inside the reheater 53 heats the compressed gas with the heat energy stored in the heat storage tank 52. Simultaneously, the cooled medium after heat absorption is transported to the cold storage tank 54 for storage, so as to cool the gas during subsequent compression. In this embodiment, the multi-stage reheater 53 is configured as a two-stage system, including a first reheater and a second reheater, both connected to the heat storage tank 52 and the cold storage tank 54, so that the cooled medium after heat exchange between the first and second reheaters can enter the cold storage tank 54 for storage. The flow direction of the compressed gas is as follows: gas storage device 12, first reheater, first expander, second reheater, second expander. The compressed gas enters the expander for expansion and work only after passing through the multi-stage reheater, which can further improve the power generation efficiency of the compressed gas and improve energy utilization.

[0094] The medium includes one or more of the following: inorganic salt solution, organic polymer solution, and ionic liquid.

[0095] Furthermore, such as Figure 3 As shown, the first gas supply system 3 includes:

[0096] The first gas supply subsystem 31, the second gas supply subsystem 32, and the nitrogen and oxygen supply subsystem 33 are used to prepare mixed compressed gas, and the nitrogen and oxygen supply subsystem 33 is used to prepare oxygen and nitrogen.

[0097] The air inlet of the first gas supply subsystem 31 is connected to the first power generation system 2 through the first pipe 301;

[0098] The air inlet of the nitrogen and oxygen supply subsystem 33 is connected to the first power generation system 2 through the second pipe 302, and the air inlet of the nitrogen and oxygen supply subsystem 33 is connected to the first pipe 301 through the third pipe 303.

[0099] The air inlet of the second air supply subsystem 32 is connected to the nitrogen and oxygen supply subsystem 33 via the fourth pipe 304.

[0100] Specifically, when the first pipe 301 and the second pipe 302 are connected, compressed air is directly drawn from the expander 21 into the first gas supply system 3, and the remaining air in the expander 21 that has completed its work is discharged into the atmosphere.

[0101] Furthermore, such as Figure 3 As shown, the first gas supply subsystem 31 includes:

[0102] The filter unit 311 has its inlet end connected to the outlet end of the first power generation system 2 via the first pipe 301. It is used to filter the gas after power generation to form a mixed compressed gas. The outlet end of the filter unit 311 is connected to the mixed compressed gas user end 6.

[0103] Nitrogen and oxygen supply subsystem 33 includes:

[0104] The precooling unit 331, the purification unit 332 and the fractionation unit 333 are arranged sequentially along the gas flow direction. The gas inlet of the precooling unit 331 is connected to the gas outlet of the first power generation system 2 through the second pipe 302, and is connected to the first pipe 301 through the third pipe 303.

[0105] The precooling unit 331 is used to cool the gas entering the first gas supply system 3;

[0106] Purification unit 332 is used to dry and remove impurities from the cooled gas;

[0107] The fractionation unit 333 is used to fractionate the dried and purified gas to obtain oxygen and nitrogen. The outlet of the fractionation unit 333 is connected to the oxygen user terminal 7 and the nitrogen user terminal 8, respectively.

[0108] The second gas supply subsystem 32 includes:

[0109] Sub-compressor 321, the inlet of sub-compressor 321 is connected to the outlet of purification unit 332 through fourth pipe 304, and is used to generate mixed compressed gas using the gas after drying and impurity removal. The outlet of sub-compressor 321 is connected to the mixed compressed gas user end 6.

[0110] Specifically, the filter unit 311 can use a gas filter element. For some mixed compressed gas users 6 that do not have strict requirements on gas pressure, the air can be directly filtered by the filter unit 311 before being supplied, ensuring the service life and production quality of equipment using compressed gas. Different filter elements can be selected to meet the user's requirements for compressed air cleanliness.

[0111] Specifically, the nitrogen and oxygen supply subsystem 33 includes a precooling unit 331, a purification unit 332, and a fractionation unit 333 arranged sequentially along the gas flow direction. The inlet pressure of the nitrogen and oxygen supply subsystem 33 is 0.5–0.6 MPa. The precooling unit 331 reduces the air temperature through contact or non-contact heat exchange. The purification unit 332 uses molecular sieves to remove harmful substances from the air, such as moisture, carbon dioxide, acetylene, propylene, propane, and nitrous oxide. The fractionation unit 333 consists of a low-pressure tower, a medium-pressure tower, and a condenser-evaporator, and uses a two-stage high- and low-pressure distillation process to obtain oxygen and nitrogen.

[0112] Specifically, for some mixed compressed gas user terminals 6 that have strict requirements on gas pressure and cleanliness, gas compression can be achieved by setting up a sub-compressor 321. The outlet pressure can be adjusted according to the gas pressure used by the mixed compressed gas user terminal 6, thereby further ensuring the stability of the supplied mixed compressed gas pressure and ensuring the service life and production quality of the equipment using compressed gas.

[0113] Among them, the mixed compressed gas user terminal 6, oxygen user terminal 7 and nitrogen user terminal 8 can be enterprises (equipment) that directly utilize the gas, or enterprises (equipment) that further process the gas.

[0114] Furthermore, when the difference between the gas consumption of the mixed compressed gas user terminal 6 and the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8 is less than or equal to a preset threshold, gas is supplied to the filter unit 311 through the first pipe 301 to prepare mixed compressed gas, and gas is supplied to the nitrogen and oxygen supply subsystem 33 through the second pipe 302 to prepare oxygen and nitrogen.

[0115] Specifically, the difference between the gas consumption of the mixed compressed gas user terminal 6 and the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8 is less than or equal to a preset threshold, including:

[0116] The gas consumption of the mixed compressed gas user terminal 6 is greater than the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8, and the difference between the two is less than or equal to a preset threshold (for example, the gas consumption of the mixed compressed gas user terminal 6 is 10m³). 3 The total gas consumption of oxygen user terminal 7 and nitrogen user terminal 8 is greater than 8m³. 3 And the difference between the two is 2m 3 Less than the preset threshold 5m 3 ),as well as

[0117] The gas consumption of the mixed compressed gas user terminal 6 is less than the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8, and the difference between the two is less than or equal to a preset threshold (for example, the gas consumption of the mixed compressed gas user terminal 6 is 8m³). 3 Less than the total gas consumption of oxygen user terminal 7 and nitrogen user terminal 8 is 10m³. 3 And the difference between the two is 2m 3 Less than the preset threshold 5m 3 ),as well as

[0118] The gas consumption of the mixed compressed gas user terminal 6 is equal to the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8 (for example, the gas consumption of the mixed compressed gas user terminal 6 and the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8 are both 8m³). 3 Furthermore, the difference between the two is less than the preset threshold of 5m. 3 ).

[0119] When the gas consumption of the mixed compressed gas user terminal 6 is greater than the total gas consumption of the oxygen user terminal 7 and the nitrogen user terminal 8 and the difference is greater than a preset threshold, gas is supplied to the filter unit 311 through the first pipe 301 to prepare mixed compressed gas, and gas is supplied to the nitrogen and oxygen supply subsystem 33 through the third pipe 303 to prepare oxygen and nitrogen.

[0120] For example: The gas consumption of user terminal 6 for mixed compressed gas is 10m³. 3 The total gas consumption of oxygen user terminal 7 and nitrogen user terminal 8 is greater than 4m³. 3 And the difference between the two is 6m 3 Greater than the preset threshold 5m 3 .

[0121] When the total gas consumption of oxygen user terminal 7 and nitrogen user terminal 8 is greater than the gas consumption of mixed compressed gas user terminal 6 and the difference is greater than a preset threshold, gas is supplied to the nitrogen and oxygen supply subsystem 33 through the second pipeline 302 to prepare oxygen and nitrogen, and gas is supplied to the sub-compressor 321 through the fourth pipeline 304 to prepare mixed compressed gas.

[0122] For example: The total gas consumption of oxygen user terminal 7 and nitrogen user terminal 8 is 10m³. 3The gas consumption of user terminal 6 is greater than 4m³. 3 And the difference between the two is 6m 3 Greater than the preset threshold 5m 3 .

[0123] The gas consumption mentioned above can be understood as the total gas consumption per unit of time, such as the gas consumption per hour.

[0124] Specifically, valves are installed on the first pipe 301, the second pipe 302, the third pipe 303, and the fourth pipe 304, and the opening and closing of the valves can control the on / off state of the corresponding pipes. This control method further ensures the stability of the gas supply during the gas preparation process.

[0125] Example 2

[0126] Based on the system structure of Embodiment 1, Embodiment 2 of the present invention also provides a gas compression energy storage and power generation coupled gas supply system, such as... Figure 1-5 As shown, the system also includes:

[0127] The second gas supply system 9 is connected to the outlet of the gas compression and storage system 1 via a pipeline and to the power supply end of the second power generation system 4 via a power transmission cable. It is used to prepare oxygen, nitrogen and mixed compressed gas by using the excess electrical energy generated by the second power generation system 4 and the compressed gas stored in the gas compression and storage system 1 when the power generation of the second power generation system 4 is greater than the power consumption of the power grid.

[0128] The second gas supply system 9 has the same system structure as the first gas supply system 3. It is also configured to include: a first gas supply subsystem 31, a second gas supply subsystem 32, and a nitrogen and oxygen supply subsystem 33.

[0129] The first gas supply subsystem 31 includes:

[0130] The filter unit 311 has its inlet end connected to the outlet end of the gas storage device 12 via the first pipe 301. It is used to filter the gas after power generation to form a mixed compressed gas. The outlet end of the filter unit 311 is connected to the mixed compressed gas user end 6.

[0131] The nitrogen and oxygen supply subsystem 33 includes:

[0132] A precooling unit 331, a purification unit 332, and a fractionation unit 333 are arranged sequentially along the gas flow direction. The inlet of the precooling unit 331 is connected to the outlet of the first power generation system 2 through a second pipe 302, and is connected to the first pipe 301 through a third pipe 303.

[0133] The precooling unit 331 is used to cool the gas entering the first gas supply system 3;

[0134] The purification unit 332 is used to dry and remove impurities from the cooled gas;

[0135] The fractionation unit 333 is used to fractionate the dried and purified gas to obtain oxygen and nitrogen. The gas outlet of the fractionation unit 333 is connected to the oxygen user terminal 7 and the nitrogen user terminal 8, respectively.

[0136] The second gas supply subsystem 32 includes:

[0137] Sub-compressor 321, the inlet of which is connected to the outlet of the purification unit 332 via a fourth pipe 304, is used to generate mixed compressed gas using the dried and impurity-removed gas. The outlet of the sub-compressor 321 is connected to the mixed compressed gas user terminal 6.

[0138] In this embodiment, when the power generation of the second power generation system 4 exceeds the power consumption of the power grid, there is excess electricity. Therefore, this excess electricity is used for gas compression and storage. Since there is no need to use the compressed gas for power generation at this time, the second gas supply system 9 utilizes this excess electricity to directly produce oxygen, nitrogen, and a mixed compressed gas. The produced oxygen, nitrogen, and mixed compressed gas are then supplied to the mixed compressed gas user terminal 6, the oxygen user terminal 7, and the nitrogen user terminal 8, respectively. This method achieves redundancy in the gas supply system, ensuring a stable gas supply, further improving energy utilization, reducing wind and solar power curtailment, and avoiding energy waste.

[0139] In another embodiment, a sub-expander 334 can be provided at the outlet of the gas storage device 12. The compressed gas is expanded by the sub-expander 334 and then oxygen, nitrogen and mixed compressed gas are prepared.

[0140] More specifically, this invention employs compressed air energy storage technology. When there is surplus power generated by the thermal power unit and renewable energy needs to be consumed, the electric motor drives the compressor to convert electrical energy into compressed air potential energy and store it in the air storage tank. When the grid load is high, the compressed air is released from the storage tank and drives the generator to generate electricity, meeting the user's power load. The heat of air compression is recovered into the medium, and during the energy release process, the heat energy is transferred to the air before the expander inlet, improving the air expansion work effect and thus improving system efficiency. Combining compressed air energy storage technology with air separation technology and centralized compressed air supply technology improves the utilization rate of system equipment and significantly reduces system energy consumption.

[0141] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0142] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0143] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0144] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A system for gas compression energy storage and power generation coupled with gas supply, characterized in that, The system includes: A gas compression and storage system (1), a first power generation system (2), and a first gas supply system (3) are arranged sequentially along the gas flow direction. The gas compression and storage system (1) is used to compress and store gas using excess electrical energy when the power generation of the second power generation system (4) is greater than the power consumption of the power grid. The first power generation system (2) is used to generate electricity by using the compressed gas stored in the gas compression and storage system (1) when the power generation of the second power generation system (4) does not meet the power consumption of the grid, so that the total power generation of the first power generation system (2) and the second power generation system (4) meets the power consumption of the grid. The first gas supply system (3) is used to prepare oxygen, nitrogen and mixed compressed gas using the gas generated after power generation; The system also includes: The second gas supply system (9) is connected to the outlet of the gas compression and storage system (1) and is used to prepare oxygen, nitrogen and mixed compressed gas by using the excess electrical energy generated by the second power generation system (4) and the compressed gas stored in the gas compression and storage system (1) when the power generation of the second power generation system (4) is greater than the power consumption of the grid. Both the first gas supply system (3) and the second gas supply system (9) include: The system comprises a first gas supply subsystem (31), a second gas supply subsystem (32), and a nitrogen and oxygen supply subsystem (33). The first gas supply subsystem (31) and the second gas supply subsystem (32) are used to prepare mixed compressed gas, and the nitrogen and oxygen supply subsystem (33) is used to prepare oxygen and nitrogen. The air inlet of the first gas supply subsystem (31) is connected to the first power generation system (2) through the first pipe (301); The air inlet of the nitrogen and oxygen supply subsystem (33) is connected to the first power generation system (2) through the second pipe (302), and the air inlet of the nitrogen and oxygen supply subsystem (33) is connected to the first pipe (301) through the third pipe (303). The air inlet of the second gas supply subsystem (32) is connected to the nitrogen and oxygen supply subsystem (33) via the fourth pipe (304).

2. The gas compression energy storage and power generation coupled gas supply system according to claim 1, characterized in that, The second power generation system (4) includes at least one of the following: wind power generation system, solar power generation system, tidal power generation system and thermal power generation system.

3. The gas compression energy storage and power generation coupled gas supply system according to claim 1, characterized in that, The gas compression storage system (1) includes: A multi-stage compressor (11) is connected to the second power generation system (4) and is used to compress gas using the electrical energy generated by the second power generation system (4); The gas storage device (12) is connected to the outlet end of the multi-stage compressor (11) and is used to store the compressed gas obtained by the multi-stage compressor (11).

4. The gas compression energy storage and power generation coupled gas supply system according to claim 3, characterized in that, The first power generation system (2) includes: A multi-stage expander (21) is connected to the outlet of the gas storage device (12) and is used to drive a generator (22) to generate electricity by using the internal energy of compressed gas.

5. The gas compression energy storage and power generation coupled gas supply system according to claim 4, characterized in that, The system also includes: The cold and heat recycling system (5) is used to cool the compressed gas entering the gas storage device (12) during the gas compression process and to heat the compressed gas entering the multi-stage expander (21) during the power generation process using the compressed gas.

6. The gas compression energy storage and power generation coupled gas supply system according to claim 5, characterized in that, The cold and heat recycling system (5) includes: A multi-stage heat exchanger (51), a heat storage tank (52), a multi-stage reheater (53), and a cold storage tank (54) that form a circulation path along the direction of medium flow. The inlet end of the multi-stage heat exchanger (51) is connected to the multi-stage compressor (11), and the outlet end is connected to the gas storage device (12), which is used to cool the compressed gas entering the gas storage device (12) during the gas compression process. The inlet of the multi-stage reheater (53) is connected to the gas storage device (12), and the outlet is connected to the multi-stage expander (21), which is used to heat the compressed gas entering the multi-stage expander (21) during the process of generating electricity using compressed gas.

7. The gas compression energy storage and power generation coupled gas supply system according to claim 1, characterized in that, The first gas supply subsystem (31) includes: The filter unit (311) has its inlet end connected to the outlet end of the first power generation system (2) via a first pipe (301) for filtering the gas after power generation to form a mixed compressed gas. The outlet end of the filter unit (311) is connected to the user end (6) of the mixed compressed gas. The nitrogen and oxygen supply subsystem (33) includes: A precooling unit (331), a purification unit (332), and a fractionation unit (333) are arranged sequentially along the gas flow direction. The inlet of the precooling unit (331) is connected to the outlet of the first power generation system (2) through a second pipe (302), and is connected to the first pipe (301) through a third pipe (303). The precooling unit (331) is used to cool the gas entering the first gas supply system (3); The purification unit (332) is used to dry and remove impurities from the cooled gas; The fractionation unit (333) is used to fractionate the dried and purified gas to obtain oxygen and nitrogen. The outlet of the fractionation unit (333) is connected to the oxygen user terminal (7) and the nitrogen user terminal (8) respectively. The second gas supply subsystem (32) includes: The sub-compressor (321) has its inlet end connected to the outlet end of the purification unit (332) via a fourth pipe (304) for generating mixed compressed gas using the dried and impurity-removed gas. The outlet end of the sub-compressor (321) is connected to the mixed compressed gas user end (6).

8. The gas compression energy storage and power generation coupled gas supply system according to claim 7, characterized in that, When the difference between the gas consumption of the mixed compressed gas user terminal (6) and the total gas consumption of the oxygen user terminal (7) and the nitrogen user terminal (8) is less than or equal to a preset threshold, gas is supplied to the filter unit (311) through the first pipe (301) to prepare mixed compressed gas, and gas is supplied to the nitrogen and oxygen supply subsystem (33) through the second pipe (302) to prepare oxygen and nitrogen. When the gas consumption of the mixed compressed gas user terminal (6) is greater than the total gas consumption of the oxygen user terminal (7) and the nitrogen user terminal (8) and the difference is greater than a preset threshold, gas is supplied to the filter unit (311) through the first pipe (301) to prepare mixed compressed gas, and gas is supplied to the nitrogen and oxygen supply subsystem (33) through the third pipe (303) to prepare oxygen and nitrogen. When the total gas consumption of the oxygen user terminal (7) and the nitrogen user terminal (8) is greater than the gas consumption of the mixed compressed gas user terminal (6) and the difference is greater than a preset threshold, gas is supplied to the nitrogen and oxygen supply subsystem (33) through the second pipeline (302) to prepare oxygen and nitrogen, and gas is supplied to the sub-compressor (321) through the fourth pipeline (304) to prepare mixed compressed gas.

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