Gas recovery system and gas recovery method

Abstract

The invention belongs to the technical field of resource conveying equipment, and particularly relates to a gas recovery system and a gas recovery method.The gas recovery system comprises a gas inlet mechanism, a gas outlet mechanism, a gas outlet mechanism and a gas recovery device, and the gas inlet end of the gas inlet mechanism communicates with the exhaust end of a storage device storing to-be-recovered gas; the air inlet end of the air compression part located at the head end communicates with the air outlet end of the air inlet mechanism, and the multiple air compression parts are used for conducting multi-stage compression on the to-be-recycled air in sequence; the multiple interstage coolers and the multiple gas compression pieces are sequentially and alternately arranged in a communicating mode, and the interstage coolers are used for cooling and conveying the gas compressed by the gas compression pieces; and the gas inlet end of the storage mechanism communicates with the gas outlet end of the interstage cooler located at the tail end, and the storage mechanism is used for storing the to-be-recycled gas subjected to multi-stage compression and cooling. By adopting the method, the to-be-recovered gas can be subjected to multi-stage compression and cooling, so that the to-be-recovered gas is safely recovered.

Description

Technical Field

[0001] The invention belongs to the technical field of resource conveying equipment, and in particular relates to a gas recovery system and a gas recovery method. Background Art

[0002] As a clean, high calorific value energy source, natural gas and other fuel gases are receiving more and more attention. In recent years, with the continuous construction of domestic long-distance fuel gas pipelines, the venting volume of natural gas from compressor stations and various process pipelines along the pipeline has increased year by year, and the number of pipeline trunk and station renovations has increased year by year. The venting volume of fuel gas trunk lines and stations is obviously high, and the vented fuel gas is basically handled by burning flares or direct discharge. The above treatment methods have caused serious waste of resources and carbon emissions.

[0003] There are some equipment and methods for the secondary utilization of vented fuel gas in the prior art. However, the amount of natural gas vented during transformation and overhaul is large, and the fuel gas needs to be compressed before storage. Fuel gas is flammable and explosive. There are safety hazards in the compression process of fuel gas. If the fuel gas explodes due to excessive temperature during the compression process, it will cause serious safety accidents. Summary of the invention

[0004] The purpose of the present invention is to provide a gas recovery system and a gas recovery method to solve the technical problem in the prior art that the gas to be recovered is difficult to compress safely.

[0005] In order to achieve the above object, the present invention provides a gas recovery system on one hand, the gas recovery system comprising:

[0006] An air intake mechanism, wherein an air intake end of the air intake mechanism is connected to a discharge end of a storage device storing gas to be recovered;

[0007] A plurality of gas compression components connected in sequence, wherein the gas inlet end of the gas compression component at the head end is connected to the gas outlet end of the gas inlet mechanism, and the plurality of gas compression components are respectively used to sequentially perform multi-stage compression on the gas to be recovered;

[0008] A plurality of interstage coolers, wherein the plurality of interstage coolers and the plurality of gas compressors are arranged in alternating communication with each other, and the interstage coolers are used to cool and transmit the gas compressed from the gas compressors;

[0009] A storage mechanism, wherein the air inlet end of the storage mechanism is connected to the air outlet end of the interstage cooler located at the tail end and is used to store the gas to be recovered after multi-stage compression and cooling.

[0010] In some embodiments, the gas compressor also has an emptying end, and the gas recovery system also includes multiple emptying pipelines, the air inlet ends of the multiple emptying pipelines are connected to the emptying ends of the multiple gas compressors one by one, and the air outlet ends of the emptying pipelines are connected to the outside atmosphere; the air intake mechanism includes: a main pipeline, the air inlet end of the main pipeline is connected to the discharge end of the storage device, and the air outlet end of the main pipeline is connected to the air inlet end of the gas compressor located at the head end; a storage container, nitrogen is stored in the storage container, and the air outlet end of the storage container is connected to the main pipeline, and the nitrogen is used to replace the air in the main pipeline, multiple gas compressors and multiple interstage coolers before gas recovery.

[0011] In some embodiments, the air intake mechanism also includes: a first flow detection component installed on the main line and used to detect the gas flow of the main line; a first pressure detection component installed on the main line and used to detect the gas pressure of the main line; a gas regulating valve connected to the main line and used to adjust the gas pressure and gas flow of the main line.

[0012] In some embodiments, any adjacent gas compressors and interstage coolers are connected via a branch pipe, one end of the branch pipe is connected to the outlet end of the gas compressor, and the other end of the branch pipe is connected to the inlet end of the interstage cooler. A safety valve is installed on the branch pipe, which is arranged on the branch pipe and is used to limit the maximum pressure in the branch pipe.

[0013] In some embodiments, a first temperature detection component is installed at the air inlet end of the interstage cooler, and a second temperature detection component is installed at the air outlet end of the interstage cooler. The air inlet end of each gas compressor is connected to a gas filter. The gas recovery system also includes a drain pipeline, which is connected to the drain end of the interstage cooler. The drain pipeline is used to remove impurities obtained after the gas to be recovered is cooled.

[0014] In some embodiments, the storage mechanism includes: an outlet pipeline, the air inlet end of the outlet pipeline is connected to the air outlet end of the interstage cooler located at the tail end; a storage element, the air inlet end of the storage element is connected to the air outlet end of the outlet pipeline and is used to store the processed gas to be recovered; a filter is arranged in the outlet pipeline and is used to filter impurities in the gas to be recovered.

[0015] A second aspect of the present invention provides a gas recovery method, which is applied to the above-mentioned gas recovery system. The gas recovery method comprises the following steps:

[0016] Replace the gas in the gas recovery system with nitrogen;

[0017] Open the air inlet end of the air inlet mechanism and pass the gas to be recovered into the gas recovery system;

[0018] Starting multiple gas compressors and multiple interstage coolers to perform multi-stage compression and cooling on the gas to be recovered;

[0019] The storage mechanism is opened to store the gas to be recovered after multi-stage compression and cooling.

[0020] In some embodiments, the air intake mechanism includes a storage container storing nitrogen, and the gas recovery system also includes multiple exhaust pipes. The step of replacing the gas in the gas recovery system with nitrogen includes: opening the storage container and the multiple exhaust pipes to allow the nitrogen to replace the air in the gas recovery system and exhaust the air from the exhaust pipes; after replacing for a first preset time period, determining that the nitrogen replacement is completed and closing the storage container.

[0021] In some embodiments, the step of opening the air intake end of the air intake mechanism and passing the gas to be recovered into the gas recovery system includes: opening the air intake end of the air intake mechanism so that the gas to be recovered replaces the nitrogen, and the nitrogen is discharged from the exhaust pipeline; after the replacement for a second preset time period, determining that the replacement of the gas to be recovered is completed.

[0022] In some embodiments, the air intake mechanism also includes a main line, and a first flow detection component, a first pressure detection component and a gas regulating valve installed on the main line, and the gas recovery method also includes the following steps: after opening the air intake end of the air intake mechanism, observing the flow detection value of the first flow detection component and the pressure detection value of the first pressure detection component; when the flow detection value is greater than a preset maximum flow threshold, adjusting the gas regulating valve to reduce the flow of the main line; when the pressure detection value is greater than a preset maximum pressure threshold, adjusting the gas regulating valve to reduce the pressure of the main line.

[0023] In the above technical solution, the gas recovery system includes an air intake mechanism, a plurality of gas compressors connected in sequence, a plurality of interstage coolers and a storage mechanism. The air intake mechanism can receive the gas to be recovered and transmit the gas to the gas compressor and the interstage cooler. The gas compressor can compress the gas. The temperature of the pressurized gas will increase. There are safety hazards in transporting the gas to be recovered at high temperature. Therefore, an interstage cooler is arranged at the outlet of the gas compressor. The interstage cooler can cool and transmit the compressed gas to be recovered. After multiple compressions and multiple coolings, the gas to be recovered can be safely transmitted to the storage mechanism for storage. The above gas recovery system can be used to perform multi-stage compression and cooling on the gas to be recovered. The temperature of the gas to be recovered can be strictly controlled before and after compression of the gas to be recovered, which can avoid the occurrence of safety accidents.

[0024] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative work. In the accompanying drawings:

[0026] Figure 1 A schematic diagram of a gas recovery system according to an embodiment of the present invention;

[0027] Figure 2 The present invention is a flow chart of a gas recovery method according to an embodiment of the present invention.

[0028] Description of Reference Numerals

[0029] 1 Storage container

[0030] 2 Main Road

[0031] 3. First flow detection element

[0032] 4. First pressure detection piece

[0033] 5 Gas Filters

[0034] 6 Compression element

[0035] 7 Safety valve

[0036] 8 Check valve

[0037] 9 Second pressure detection piece

[0038] 10 First temperature detection element

[0039] 11 Interstage cooler

[0040] 12. Second temperature detection element

[0041] 13 Drain the lines

[0042] 14 Sewage pipe

[0043] 15 Air outlet pipe

[0044] 17 Filters

[0045] 18 Second flow detection element

[0046] 19 Gas regulating valve

[0047] 20 branch lines DETAILED DESCRIPTION

[0048] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0049] The following describes a gas recovery system and a gas recovery method according to embodiments of the present invention with reference to the accompanying drawings.

[0050] like Figure 1 FIG. 1 is a schematic diagram of a gas recovery system according to an embodiment of the present invention. The gas recovery system includes:

[0051] An air intake mechanism, wherein an air intake end of the air intake mechanism is connected to a discharge end of a storage device storing gas to be recovered;

[0052] A plurality of gas compression components 6 connected in sequence, wherein the gas inlet end of the gas compression component 6 at the head end is connected to the gas outlet end of the gas inlet mechanism, and the plurality of gas compression components 6 are respectively used to sequentially perform multi-stage compression on the gas to be recovered;

[0053] A plurality of interstage coolers 11, the plurality of interstage coolers 11 and the plurality of gas compressors 6 are arranged in alternating communication with each other, and the interstage coolers 11 are used to cool and transmit the gas compressed from the gas compressor 6;

[0054] A storage mechanism, the air inlet end of the storage mechanism is connected to the air outlet end of the interstage cooler 11 located at the tail end and is used to store the gas to be recovered after multi-stage compression and cooling.

[0055] The discharge of fuel gas into the atmosphere will lead to a large amount of carbon emissions and waste of resources. Therefore, the fuel gas in the pipeline needs to be recovered. However, the gas pressure in the pipeline is low, and the gas needs to be compressed if it is to be recovered. During the compression process, the temperature of the fuel gas will increase, which may easily ignite and explode the fuel gas, resulting in safety accidents. The embodiment of the present invention provides a gas recovery system to solve the above problems.

[0056] The gas recovery system includes an air intake mechanism, a plurality of gas compressors 6 connected in sequence, a plurality of interstage coolers 11 and a storage mechanism. Among them, the air intake end of the air intake mechanism is connected to the discharge end of a storage device (such as a natural gas transmission pipeline, a natural gas storage station device) storing the gas to be recovered. Among them, the gas to be recovered can be a fuel gas such as natural gas. A plurality of gas compressors 6 connected in sequence can perform multi-stage compression on the gas to be recovered transmitted by the air intake mechanism to facilitate the storage and transportation of the gas to be recovered. The interstage cooler 11 can cool the compressed gas to be recovered to prevent the high temperature of the gas to be recovered from causing a safety accident. The storage mechanism can store the compressed and cooled gas to be recovered. The transmission process of the gas to be recovered in the gas recovery system is as follows: the low-pressure gas to be recovered first enters from the air intake end of the air intake mechanism, and the gas compressor 6 located at the head compresses the low-pressure gas to be recovered for the first time and transmits it to the interstage cooler 11 connected thereto. The temperature of the gas to be recovered after compression is high, and the interstage cooler 11 can cool the gas to be recovered to facilitate the secondary compression of the gas to be recovered. The gas to be recovered after one compression and one cooling is transmitted to the second gas compressor 6 for secondary compression of the gas to be recovered. The gas to be recovered after multi-stage compression and cooling has high gas density and low temperature, which is convenient for storage and transportation. The storage mechanism stores the gas to be recovered after multi-stage compression and cooling.

[0057] In one embodiment, Figure 1 As shown, the gas compressor 6 also has an exhaust end, and the gas recovery system also includes multiple exhaust pipelines 13, the air inlet ends of the multiple exhaust pipelines 13 are connected to the exhaust ends of the multiple gas compressors 6 one by one, and the air outlet ends of the exhaust pipelines 13 are connected to the outside atmosphere. The air intake mechanism includes a main pipeline 2 and a storage container 1, the air inlet end of the main pipeline 2 is connected to the exhaust end of the storage device, and the air outlet end of the main pipeline 2 is connected to the air inlet end of the gas compressor 6 located at the head end. Nitrogen is stored in the storage container 1, and the air outlet end of the storage container 1 is connected to the main pipeline 2. Nitrogen is used to replace the air in the main pipeline 2, multiple gas compressors 6 and multiple interstage coolers 11 before gas recovery.

[0058] When the gas to be recovered is a fuel gas such as natural gas, directly compressing and cooling the gas to be recovered and the air is likely to cause an explosion, and will also cause the compressed gas to be impure. Therefore, it is necessary to replace the air in the gas recovery system with nitrogen. The gas recovery system provided in the embodiment of the present invention includes a plurality of exhaust pipes 13, and the exhaust pipes 13 are connected to the exhaust end of the gas compressor 6. When the gas is replaced, the gas in the gas recovery system can flow from the exhaust pipes 13 to the atmosphere to prevent the high-temperature gas to be recovered from causing an explosion during the compression process. The air intake mechanism provided in the embodiment of the present application includes a main line 2 and a storage container 1. The air intake end of the main line 2 is connected to the air outlet end of the storage device, and the air outlet end of the main line 2 is connected to the air intake end of the gas compressor 6 located at the head end. The gas to be recovered can enter the gas compressor 6 through the main line 2 for gas compression. Nitrogen is stored in the storage container 1, and the gas outlet of the storage container 1 is connected to the main pipeline 2. Before the gas to be recovered enters the main pipeline 2, the main pipeline 2 and the storage container 1 are connected so that the nitrogen can enter the multiple gas compressors 6, multiple interstage coolers 11 and the pipelines therebetween from the main pipeline 2, and the gas is emptied through the exhaust pipeline 13 to complete the gas replacement. The above-mentioned gas recovery system can replace the air in the gas recovery system to prevent explosion accidents during the gas compression process.

[0059] In one embodiment, during the gas replacement process, the gas outlet of the interstage cooler 11 at the tail end is also connected to the atmosphere to exhaust the air in the interstage cooler 11 at the tail end.

[0060] In one embodiment, Figure 1 As shown, the air intake mechanism also includes a first flow detection component 3, a first pressure detection component 4 and a gas regulating valve 19. The first flow detection component 3 is installed on the main pipeline 2 and is used to detect the gas flow of the main pipeline 2. The first pressure detection component 4 is installed on the main pipeline 2 and is used to detect the gas pressure of the main pipeline 2. The gas regulating valve 19 is connected to the main pipeline 2 and is used to adjust the gas pressure and gas flow of the main pipeline 2. During the intake process of the gas to be recovered, the intake flow and pressure need to be strictly controlled to prevent the intake flow and gas pressure from being too fast, causing the gas compressor 6 and the interstage cooler 11 to overload, thereby causing component failure in the pipeline. In one embodiment, as Figure 1As shown, any adjacent gas compressor 6 and interstage cooler 11 are connected through a branch pipeline 20, one end of the branch pipeline 20 is connected to the gas outlet end of the gas compressor 6, and the other end of the branch pipeline 20 is connected to the gas inlet end of the interstage cooler 11. A safety valve 7 is installed on the branch pipeline 20, which is arranged on the branch pipeline 20 and is used to limit the maximum pressure in the branch pipeline 20. After the gas to be recovered is compressed by the compressor 6, the gas temperature is high and the gas pressure is high, which may easily cause the branch pipeline 20 to be unable to withstand the gas pressure and malfunction. Therefore, a safety valve 7 is arranged on the branch pipeline 20. When the gas pressure exceeds the preset pressure threshold, the safety valve 7 opens to discharge the gas, reduce the gas pressure in the branch pipeline 20, and protect the branch pipeline 20 to be able to normally transmit the gas to be recovered to the interstage cooler 11 for a long time.

[0061] In one embodiment, Figure 1 As shown, the air inlet end of the interstage cooler 11 is equipped with a first temperature detection member 10, the air outlet end of the interstage cooler 11 is equipped with a second temperature detection member 12, the air inlet end of each gas compressor 6 is connected to a gas filter 5, and the gas recovery system also includes a sewage discharge pipeline 14, which is connected to the sewage discharge end of the interstage cooler 11, and the sewage discharge pipeline 14 is used to remove impurities obtained after the gas to be recovered is cooled. The setting of the first temperature detection member 10 and the second temperature detection member 12 can detect the temperature difference of the gas to be recovered when entering and exiting the interstage cooler 11, and then determine the cooling effect of the gas to be recovered. The air inlet end of each gas compressor 6 is connected to a gas filter 5, and the gas filter 5 can filter out impurities in the pipeline to protect the gas compressor 6 and extend the service life of the gas compressor 6. If the purity of the gas to be recovered is not high, some impurities, such as liquid water and water vapor, can be separated during the cooling process. The impurities flow from the sewage discharge end of the gas recovery system to the sewage discharge pipeline 14 to remove the impurities and improve the purity of the gas to be recovered.

[0062] In one embodiment, Figure 1 As shown, the storage mechanism includes an outlet pipeline 15, a storage element (not shown in the figure) and a filter 17. The air inlet end of the outlet pipeline 15 is connected to the outlet end of the interstage cooler 11 located at the tail end, the air inlet end of the storage element is connected to the outlet end of the outlet pipeline 15 and is used to store the processed gas to be recovered, and the filter 17 is arranged on the outlet pipeline 15 and is used to filter impurities in the gas to be recovered. The outlet pipeline 15 can transfer the gas to be recovered after multi-stage compression and cooling to the storage element for storage, so as to facilitate the transmission and transportation of the gas to be recovered after multi-stage compression and cooling. The filter 17 can filter out impurities in the gas to be recovered and improve the purity of the gas to be recovered.

[0063] In one embodiment, Figure 1As shown, the gas recovery system also includes a check valve 8 and a second pressure detection component 9 installed on the branch pipeline 20. The check valve 8 is used to prevent the gas to be recovered that flows into the interstage cooler 11 from flowing back to the gas compression component 6. The second pressure detection component 9 is used to detect the gas pressure at the air inlet end of the interstage cooler 11, which can prevent the gas pressure in the branch pipeline 20 from being too high.

[0064] In one embodiment, Figure 1 As shown, the storage mechanism is also provided with a second flow detection element 18 for detecting the gas flow in the gas outlet pipeline 15 to prevent component failure caused by excessive flow rate.

[0065] In one embodiment, a gas recovery method is provided, which is applied to the above-mentioned gas recovery system, such as Figure 2 FIG. 1 is a flow chart of a gas recovery method according to an embodiment of the present invention. The gas recovery method comprises the following steps:

[0066] S101, replacing the gas in the gas recovery system with nitrogen.

[0067] S102, opening the air intake end of the air intake mechanism, and passing the gas to be recovered into the gas recovery system.

[0068] S103, start multiple gas compressors 6 and multiple interstage coolers 11 to perform multi-stage compression and cooling on the gas to be recovered.

[0069] S104, opening the storage mechanism to store the gas to be recovered after multi-stage compression and cooling.

[0070] In the process of gas recovery through the above-mentioned gas recovery system, the air in the gas recovery system is first replaced with nitrogen to prevent the high-temperature mixed gas from causing an explosion when the gas to be recovered is a fuel gas such as natural gas. Then, the air intake end of the air intake mechanism is opened, the gas to be recovered is introduced into the gas recovery system, and multiple gas compressors 6 and multiple interstage coolers 11 are started to perform multi-stage compression and cooling on the gas to be recovered. Because the gas compressors 6 and the interstage coolers 11 are arranged one-to-one, the gas to be recovered is compressed, cooled, compressed, and cooled in the gas recovery system in sequence until the gas to be recovered is transmitted to the interstage cooler 11 located at the tail end, and the interstage cooler 11 located at the tail end transmits the gas to be recovered to the storage mechanism for storage. By adopting the above-mentioned gas recovery method, the gas to be recovered can be safely and efficiently compressed and cooled in multiple stages, which is convenient for the storage and transportation of the gas to be recovered.

[0071] In one embodiment, the air intake mechanism includes a storage container 1 storing nitrogen, and the gas recovery system also includes a plurality of exhaust pipes 13. The step of replacing the gas in the gas recovery system with nitrogen includes: opening the storage container 1 and the plurality of exhaust pipes 13 so that the nitrogen replaces the air in the gas recovery system and discharges the air from the exhaust pipes 13; after the replacement for a first preset time period, determining that the nitrogen replacement is completed and closing the storage container 1. In the process of replacing the air in the gas recovery system, it is necessary to first open the storage container 1 and the exhaust pipe 13 to discharge the air in the gas recovery system through nitrogen. After the replacement for the first preset time period, it can be determined that the nitrogen replacement is completed, and the storage container 1 can be closed to perform the gas recovery step.

[0072] In a specific embodiment, the first preset time period is determined according to the following steps: after opening the storage container 1, the nitrogen concentration at the outlet of the exhaust pipe 13 is detected in real time. When the nitrogen concentration reaches the preset concentration threshold, it is determined that the air in the gas recovery system is completely replaced, and the time difference from when the storage container 1 is opened to when the nitrogen concentration reaches the preset concentration threshold is determined as the first preset time period.

[0073] In one embodiment, the step of opening the air intake end of the air intake mechanism and passing the gas to be recovered into the gas recovery system includes: opening the air intake end of the air intake mechanism so that the gas to be recovered replaces the nitrogen, and the nitrogen is discharged from the exhaust pipe 13; after the replacement for a second preset time period, it is determined that the replacement of the gas to be recovered is completed. Before gas compression and cooling, it is necessary to replace the nitrogen in the gas recovery system to improve the purity of the recovered gas. Therefore, the air intake end of the air intake mechanism is first opened to replace the nitrogen with the gas to be recovered, and the nitrogen is discharged from the exhaust pipe 13. After the replacement for the second preset time period, it can be determined that the replacement of the gas to be recovered is completed. The above method can improve the purity of the recovered gas to improve the recovery quality.

[0074] In a specific embodiment, the second preset time period is determined according to the following steps: after the air intake mechanism is opened, the concentration of the gas to be recovered at the outlet of the exhaust pipe 13 is detected in real time. When the concentration of the gas to be recovered reaches the preset concentration threshold, it is determined that the nitrogen in the gas recovery system is completely replaced, and the time difference from the time when the air intake mechanism is opened to the time when the concentration of the gas to be recovered reaches the preset concentration threshold is determined as the second preset time period.

[0075] In one embodiment, the air intake mechanism further includes a main line 2, and a first flow detection component 3, a first pressure detection component 4 and a gas regulating valve 19 installed on the main line 2, and the gas recovery method further includes the following steps: after opening the air intake end of the air intake mechanism, observing the flow detection value of the first flow detection component 3 and the pressure detection value of the first pressure detection component 4; when the flow detection value is greater than the preset maximum flow threshold, adjusting the gas regulating valve 19 to reduce the flow of the main line 2; when the pressure detection value is greater than the preset maximum pressure threshold, adjusting the gas regulating valve 19 to reduce the pressure of the main line 2. When the gas pressure or gas flow in the main line 2 is too high, the gas flow and gas pressure in the main line 2 can be adjusted by the gas regulating valve 19 to prevent the gas compressor 6 and the interstage cooler 11 from overloading and protect the components in the gas recovery system.

[0076] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A gas recovery system, characterized in that: The gas recovery system comprises: An air intake mechanism, wherein the air intake end of the air intake mechanism is connected to the discharge end of a storage device storing the gas to be recovered; A plurality of gas compression components (6) connected in sequence, wherein the gas inlet end of the gas compression component (6) located at the head end is connected to the gas outlet end of the gas inlet mechanism, and the plurality of gas compression components (6) are respectively used to sequentially perform multi-stage compression on the gas to be recovered; a plurality of interstage coolers (11), wherein the plurality of interstage coolers (11) and the plurality of gas compressors (6) are arranged in alternating communication with each other, and the interstage coolers (11) are used to cool and transmit the gas compressed by the gas compressors (6); A storage mechanism, wherein the air inlet end of the storage mechanism is connected to the air outlet end of the interstage cooler (11) located at the tail end and is used to store the gas to be recovered after multi-stage compression and cooling.

2. The gas recovery system according to claim 1, characterized in that: The gas compressor (6) also has an exhaust end, and the gas recovery system also includes a plurality of exhaust pipelines (13), the air inlet ends of the plurality of exhaust pipelines (13) are connected to the exhaust ends of the plurality of gas compressors (6) in a one-to-one correspondence, and the air outlet ends of the exhaust pipelines (13) are connected to the outside atmosphere; the air intake mechanism includes: A main pipeline (2), wherein the air inlet end of the main pipeline (2) is connected to the discharge end of the storage device, and the air outlet end of the main pipeline (2) is connected to the air inlet end of the gas compressor (6) located at the head end; A storage container (1), wherein nitrogen is stored in the storage container (1), and the gas outlet end of the storage container (1) is connected to the main pipeline (2), and the nitrogen is used to replace air in the main pipeline (2), the plurality of gas compressors (6) and the plurality of interstage coolers (11) before gas recovery.

3. The gas recovery system according to claim 2, characterized in that: The air intake mechanism also includes: A first flow detection element (3) is installed on the main pipe (2) and is used to detect the gas flow of the main pipe (2); A first pressure detection component (4) is installed on the main pipe (2) and is used to detect the gas pressure of the main pipe (2); A gas regulating valve (19) is connected to the main pipeline (2) and is used to adjust the gas pressure and gas flow rate of the main pipeline (2).

4. The gas recovery system according to claim 1, characterized in that: Any adjacent gas compressors (6) and interstage coolers (11) are connected via a branch pipeline (20), one end of the branch pipeline (20) is connected to the gas outlet end of the gas compressor (6), and the other end of the branch pipeline (20) is connected to the gas inlet end of the interstage cooler (11), and a safety valve (7) is installed on the branch pipeline (20), which is arranged on the branch pipeline (20) and is used to limit the maximum pressure in the branch pipeline (20).

5. The gas recovery system according to claim 1, characterized in that: The air inlet end of the interstage cooler (11) is equipped with a first temperature detection component (10), the air outlet end of the interstage cooler (11) is equipped with a second temperature detection component (12), the air inlet end of each gas compressor (6) is connected to a gas filter (5), and the gas recovery system further comprises a sewage discharge pipeline (14), the sewage discharge pipeline (14) is connected to the sewage discharge end of the interstage cooler (11), and the sewage discharge pipeline (14) is used to remove impurities obtained after the gas to be recovered is cooled.

6. The gas recovery system according to claim 1, characterized in that: The storage mechanism comprises: An air outlet pipeline (15), wherein an air inlet end of the air outlet pipeline (15) is connected to an air outlet end of the interstage cooler (11) located at the tail end; A storage element, the gas inlet end of the storage element is connected to the gas outlet end of the gas outlet pipeline (15) and is used to store the processed gas to be recovered; A filter (17) is arranged on the gas outlet pipeline (15) and is used to filter impurities in the gas to be recovered.

7. A gas recovery method, characterized in that: The gas recovery system according to any one of claims 1 to 6, wherein the gas recovery method The following steps are involved: replacing the gas in the gas recovery system with nitrogen; Opening the air inlet end of the air inlet mechanism and passing the gas to be recovered into the gas recovery system; Starting a plurality of the gas compressors (6) and a plurality of the interstage coolers (11) to perform multi-stage compression and cooling on the gas to be recovered; The storage mechanism is opened to store the gas to be recovered after multi-stage compression and cooling.

8. The gas recovery method according to claim 7, characterized in that: The air intake mechanism comprises a storage container (1) storing the nitrogen, the gas recovery system further comprises a plurality of exhaust pipelines (13), and the step of replacing the gas in the gas recovery system with nitrogen comprises: Opening the storage container (1) and the plurality of evacuation pipelines (13) to allow the nitrogen to replace the air in the gas recovery system and to discharge the air from the evacuation pipelines (13); After the first preset period of time has passed, it is determined that the nitrogen replacement is complete and the storage container (1) is closed.

9. The gas recovery method according to claim 8, characterized in that: The step of opening the air inlet end of the air inlet mechanism and passing the gas to be recovered into the gas recovery system comprises: Opening the air inlet end of the air inlet mechanism so that the gas to be recovered replaces the nitrogen, and the nitrogen is discharged from the exhaust pipeline (13); After the second preset time period has passed, it is determined that the replacement of the gas to be recovered is completed.

10. The gas recovery method according to claim 7, characterized in that: The air intake mechanism further comprises a main pipe (2), and a first flow detection element (3), a first pressure detection element (4) and a gas regulating valve (19) installed on the main pipe (2). The gas recovery method further comprises the following steps: After opening the air intake end of the air intake mechanism, observing the flow detection value of the first flow detection element (3) and the pressure detection value of the first pressure detection element (4); When the flow rate detection value is greater than a preset maximum flow rate threshold, adjusting the gas regulating valve (19) to reduce the flow rate of the main pipeline (2); When the pressure detection value is greater than a preset maximum pressure threshold, the gas regulating valve (19) is adjusted to reduce the pressure of the main pipeline (2).

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