Gas transmission system of salt cavern type gas storage

Abstract

The utility model discloses a gas transmission system of a salt-cavern gas storage, which comprises a gas injection pipeline for injecting gas into the salt-cavern gas storage and a gas production pipeline for producing gas from the salt-cavern gas storage, and a plurality of separation devices are arranged on the gas production pipeline. According to the utility model, a plurality of separation devices are arranged on the gas production pipeline and are used for separating gas from corrosives (salt rock particles, brine and the like), so that the blockage or corrosion of a gas pipeline, an in-plant heat exchanger and an air turbine is effectively prevented, the safety of an energy storage power station is improved, and the service life of the energy storage power station is prolonged; and the gas injection pipeline and the gas production pipeline share the same main pipeline, so that the gas transmission structure is simplified, the cost is reduced, the gas injection pipeline and the gas production pipeline are pipelines of which the contact gas surfaces have an anti-corrosion function, and the safety of the pipelines is ensured.

Description

Technical Field

[0001] The utility model relates to a gas transmission system of a salt cavern type gas storage reservoir, belonging to the technical field of energy storage systems. Background Art

[0002] The compressed air energy storage system is an electric energy storage system that can achieve large-capacity and long-term electrical energy storage. It compresses air through a compressor during low-load periods of the power grid, converts excess electrical energy into pressure energy and heat energy, and injects the compressed air into a gas storage reservoir for storage. This is the gas injection and compression energy storage stage. During high-load periods of the power grid, the high-pressure air in the gas storage reservoir is released, expanded by the expander to perform work, and drives the generator to generate electricity. This is the gas extraction, expansion and energy release stage.

[0003] Compressed air energy storage systems rely on large-capacity, low-leakage, stable and reliable gas storage devices to store compressed, high-pressure air. Natural salt caverns, as gas storage reservoirs for compressed air energy storage power plants, offer advantages such as large capacity, strong pressure bearing capacity, high geological stability, strong airtightness, and low development costs. These have become the mainstream gas storage devices for large-scale compressed air energy storage power plants on the market. However, during the expansion and energy release phase, when the air stored in the salt caverns is released into the compressed air energy storage plant, it inevitably releases salt rock particles and brine from the salt caverns. This can cause blockage or corrosion of gas pipelines, plant heat exchangers, and air turbines, reducing the safety and lifespan of the compressed air energy storage plant. Utility Model Content

[0004] The utility model provides a gas transmission system for a salt cavern type gas storage, which solves the problems disclosed in the background technology.

[0005] According to one aspect of the present disclosure, a gas transmission system for a salt cavern gas storage reservoir is provided, comprising a gas injection pipeline for injecting gas into the salt cavern gas storage reservoir and a gas production pipeline for producing gas from the salt cavern gas storage reservoir. The gas production pipeline is provided with a plurality of separation devices. The gas injection pipeline and the gas production pipeline share the same main pipeline. During gas production, the separation devices are connected to the main pipeline. During gas injection, the separation devices are isolated from the main pipeline.

[0006] In some embodiments of the present disclosure, a gas control and regulation device is further included, and the output end of the gas injection pipeline and the input end of the gas production pipeline are both connected to the salt cavern gas storage through the gas control and regulation device.

[0007] In some embodiments of the present disclosure, the gas control and regulation equipment is a gas tree.

[0008] In some embodiments of the present disclosure, at least coarse separation equipment and fine separation equipment are provided on the gas production pipeline along the gas transmission direction. The coarse separation equipment is close to the salt cavern gas storage reservoir, and the fine separation equipment is close to the compressed air energy storage power station.

[0009] In some embodiments of the present disclosure, the separation device is connected in parallel with a section of the main line, and both the input and output ends of the separation device are provided with on-off control devices, and the main line section connected in parallel with the separation device is also provided with an on-off control device.

[0010] In some embodiments of the present disclosure, the on-off control device is a shut-off valve.

[0011] In some embodiments of the present disclosure, the separation device is a cyclone separator.

[0012] In some embodiments of the present disclosure, the gas injection pipeline and the gas production pipeline are pipelines with anti-corrosion functions on the gas contact surfaces.

[0013] The beneficial effects achieved by the present invention are as follows: 1. The present invention arranges a number of separation devices on the gas production pipeline, which separates the gas from corrosive substances (salt rock particles, brine, etc.), effectively preventing the blockage or corrosion of the gas transmission pipeline, the heat exchanger in the plant, and the air turbine, thereby improving the safety and life of the energy storage power station; 2. The gas injection pipeline and the gas production pipeline of the present invention share the same main pipeline, which simplifies the gas transmission structure and reduces the cost; 3. The gas production pipeline of the present invention is provided with at least a coarse separation device and a fine separation device, which can perform multi-stage separation, improve the separation effect, and ensure the purity of the gas input to the energy storage power station; 4. The gas injection pipeline and the gas production pipeline of the present invention are pipelines with anti-corrosion function on the gas contact surface, which ensures the safety of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a first structure of a gas transmission system for a salt cavern gas storage facility;

[0015] Figure 2 Schematic diagram of the second structure of the gas transmission system of the salt cavern type gas storage;

[0016] Figure 3 This is a schematic diagram of the third structure of the gas transmission system of the salt cavern type gas storage. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the embodiments described are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0018] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0019] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0020] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0021] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] It should be noted that like symbols and letters refer to like items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0023] In order to solve the problem that gas carries salt rock particles and brine during gas production, the present disclosure proposes a gas transmission system for a salt cavern gas storage, specifically, adding separation equipment in the gas production pipeline.

[0024] See also Figure 1 , Figure 1 This is a schematic diagram of a first structure of a gas transmission system of a salt cavern gas storage provided in an embodiment of the present application. Figure 1 The system may include a gas injection pipeline for injecting gas into the salt cavern gas storage reservoir 1 and a gas production pipeline for producing gas from the salt cavern gas storage reservoir 1. A plurality of separation devices 4 are connected in series on the gas production pipeline. The gas injection pipeline and the gas production pipeline share the same main pipeline 2. During gas production, the separation devices 4 are connected to the main pipeline 2. During gas injection, the separation devices 4 are isolated from the main pipeline 2.

[0025] It should be noted that the gas injection pipeline and the gas production pipeline share the same main pipeline 2, and gas injection and gas production are carried out in different time periods. An on-off control device 3, such as a shut-off valve, can be installed on the pipeline. The shut-off valve is used to control the separation equipment 4 to be isolated from the main pipeline 2. At this time, the main pipeline 2 is used as the gas injection pipeline, and the shut-off valve is used to control the separation equipment 4 to be connected to the main pipeline 2. At this time, the main pipeline 2 and the separation equipment 4 together constitute the gas production pipeline. This method of sharing the same main pipeline 2 simplifies the gas transmission structure and reduces costs.

[0026] The specific connection between the gas injection pipeline and the gas production pipeline can be: the separation equipment 4 is connected in parallel with a section of the main pipeline 2, and an on-off control device 3, such as a shut-off valve, is installed at the input and output ends of the separation equipment 4, and an on-off control device 3 is also installed on the section of the main pipeline 2 connected in parallel with the separation equipment 4.

[0027] In the figure, A1 and A2 are shutoff valves on section 2 of the main pipeline, B1 and B2 are shutoff valves at the input and output of coarse separation equipment 4, and C1 and C2 are shutoff valves at the input and output of fine separation equipment 4. During the gas injection and compression energy storage phase, A1 and A2 are open (i.e., the gas injection pipeline is connected to salt cavern gas storage 1), and B1, B2, C1, and C2 are closed. During the gas production and expansion energy release phase, A1 and A2 are closed, and B1, B2, C1, and C2 are open (i.e., the gas production pipeline is connected to salt cavern gas storage 1). During the static phase, A1, A2, B1, B2, C1, and C2 are closed.

[0028] The function of the separation device 4 is to separate the gas from the corrosive substances (salt rock particles, brine, etc.) carried by the gas. For example, a cyclone separator can be used. The number of separation devices 4 can be set according to the content of corrosive substances in the gas. For example, if the content is low (1%), only one separation device 4 can be set. If the content is high (10%), multiple separation devices 4 can be set. The specific number can be determined according to actual conditions.

[0029] By installing a number of separation devices 4 on the gas production pipeline, the separation devices 4 separate the gas from corrosive substances (salt rock particles, brine, etc.), effectively preventing the blockage or corrosion of the gas pipeline, the heat exchanger in the plant, and the air turbine, thereby improving the safety and life of the energy storage power station.

[0030] In some embodiments, see Figure 2 Along the gas transmission direction, at least a coarse separation device 41 and a fine separation device 42 are connected in series on the gas production pipeline, wherein the coarse separation device 41 is close to the salt cavern gas storage reservoir 1, and the fine separation device 42 is close to the compressed air energy storage power station.

[0031] Only Figure 2 Taking a coarse separation device 41 and a fine separation device 42 as an example, the coarse separation device 41 and the fine separation device 42 have the same structure, both of which are cyclone separators. The difference is that the coarse separation device 41 is used to separate large particles of salt rock particles, while the fine separation device 42 separates particles with very small particle sizes and moisture precipitated during the gas transmission process. The number of coarse separation devices 41 and fine separation devices 42 is also determined according to actual conditions. If there are more coarse particles, then several coarse separation devices 41 are configured. If there are more fine particles and moisture, then several fine separation devices 42 are configured. Multi-stage separation is performed here to improve the separation effect and ensure the purity of the gas input to the energy storage power station.

[0032] In some embodiments, in order to facilitate the injection and collection of gas, the output end of the gas injection pipeline and the input end of the gas collection pipeline are both connected to the salt cavern gas storage 1 through a gas control and regulation device 6.

[0033] Gas control and regulation equipment 6 can be a Christmas tree. The underground salt cavern gas storage reservoir 1 is connected to the Christmas tree above ground via injection and production pipelines 5. The Christmas tree's surface interface is connected to the main pipeline 2. Christmas trees are used to control and regulate gas production. They effectively control and regulate gas injection and production within the gas transmission system, improving efficiency.

[0034] In the gas transmission system, two gas trees can be set up or one gas tree can be set up. If two gas trees are set up, see Figure 3 Each Christmas tree is connected to the underground salt cavern gas storage reservoir 1 through an injection and production pipeline 5, and the above-ground interfaces of the two Christmas trees are connected to the main pipeline 2.

[0035] In some embodiments, in order to further prevent corrosion, the gas injection pipeline and the gas production pipeline are pipelines with anti-corrosion function on the gas contact surface, and the main pipeline 2, the injection and production pipeline 5, the valve body flow part, the flow part of the gas production tree itself, etc. formed by the pipeline connection are mainly anti-corrosion. Among them, the inner wall of the straight pipe section is anti-corrosioned by laser cladding corrosion-resistant metal material, and the elbows, tees and other pipe fittings that are not convenient for laser cladding are anti-corrosioned by integral cladding corrosion-resistant metal material. The valve body flow part is anti-corrosioned by laser cladding or cladding corrosion-resistant metal material. Laser cladding and cladding use ASTM UNSN06625 nickel-based alloy material with a cladding thickness of 0.6mm and a cladding thickness of 2mm. The safety of the pipeline is guaranteed by anti-corrosion treatment.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas transmission system for a salt cavern gas storage, characterized in that: It includes an injection pipeline for injecting gas into the salt cavern gas storage reservoir and a gas production pipeline for producing gas from the salt cavern gas storage reservoir. Several separation devices are installed on the gas production pipeline. The injection pipeline and the gas production pipeline share the same main pipeline. When producing gas, the separation equipment is connected to the main pipeline. When injecting gas, the separation equipment is isolated from the main pipeline.

2. The system according to claim 1, wherein: It also includes a gas control and regulation device, and the output end of the gas injection pipeline and the input end of the gas production pipeline are both connected to the salt cavern gas storage reservoir through the gas control and regulation device.

3. The system according to claim 2, characterized in that The gas control and regulation equipment is the Christmas tree.

4. The system according to claim 1, wherein: Along the gas transmission direction, at least coarse separation equipment and fine separation equipment are installed on the gas production pipeline. The coarse separation equipment is close to the salt cavern gas storage, and the fine separation equipment is close to the compressed air energy storage power station.

5. The system according to claim 1, wherein: The separation device is connected in parallel with a section of the main pipeline. The input and output ends of the separation device are both provided with on-off control devices. The main pipeline section connected in parallel with the separation device is also provided with an on-off control device.

6. The system according to claim 5, characterized in that The on-off control device is a shut-off valve.

7. The system according to claim 5, characterized in that The separation equipment is a cyclone separator.

8. The system according to any one of claims 1 to 7, characterized in that: The gas injection pipeline and the gas production pipeline are pipelines with anti-corrosion function on the gas contact surface.

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