Dry gas seal vent gas recovery system of compressor station trunk line compressor

Abstract

The utility model provides a compressor station trunk line compressor dry gas seal vent gas recovery system which comprises a compressor station trunk line compressor outlet manifold, an ejector, a booster compressor, a compressor station trunk line compressor inlet manifold and a trunk line compressor dry gas seal vent gas manifold. The compressor station trunk line compressor outlet manifold is connected with the ejector through a pipeline, the ejector is respectively connected with the booster compressor and the trunk line compressor dry gas seal vent manifold through pipelines, and the booster compressor is connected with the compressor station trunk line compressor inlet manifold through a pipeline.

Description

Technical Field

[0001] This utility model relates to the field of dry gas sealing system venting technology, and in particular to a dry gas sealing venting air recovery system for a compressor station mainline compressor. Background Technology

[0002] During the normal operation of centrifugal compressors on the main line of natural gas compressor stations, the dry gas sealing system requires continuous process venting. The vented natural gas is directly released into the atmosphere, polluting the environment and wasting significant resources. Currently, the technical solution for recovering and utilizing dry gas sealing vent air in domestic compressor stations is to use compressors for pressurization and reinjection. However, due to the low pressure of the dry gas sealing vent air and the small emission capacity of a single unit, the compressor for dry gas sealing vent air recovery requires multiple pressurization stages, resulting in unstable unit operation, high energy consumption, low vent air recovery efficiency, and poor project economic benefits. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a dry gas sealing and air recovery system for a compressor station trunk compressor, which addresses the shortcomings of the existing technology.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A dry gas seal venting recovery system for a compressor station trunk compressor includes: a compressor station trunk compressor outlet manifold, an ejector, a booster compressor, a compressor station trunk compressor inlet manifold, and a trunk compressor dry gas seal venting manifold. The compressor station trunk compressor outlet manifold is connected to the ejector via a pipeline. The ejector is connected to the booster compressor and the trunk compressor dry gas seal venting manifold via pipelines. The booster compressor is connected to the compressor station trunk compressor inlet manifold via a pipeline.

[0005] The beneficial effects of this utility model's technical solution are as follows: Using an ejector connected in series with a booster compressor for vent air recovery enables economical and efficient recovery of dry gas seal vent air from the compressor station. The ejector's high-pressure intake comes from the high-pressure natural gas at the compressor station's main line compressor outlet manifold, while its low-pressure intake comes from the dry gas seal vent air manifold of the main line compressor. The ejector's outlet air goes to the booster compressor, where it is pressurized before returning to the compressor station's main line compressor inlet manifold, thus completing the recovery process. This reduces the direct venting of dry gas seal vent air from the compressor station's main line compressor, minimizing resource waste and achieving resource recycling.

[0006] Furthermore, a flow regulating valve is provided on the pipeline between the outlet manifold of the compressor station trunk compressor and the ejector. The outlet manifold of the compressor station trunk compressor, the ejector, the booster compressor, the inlet manifold of the compressor station trunk compressor, and the dry gas seal venting manifold of the trunk compressor are all installed on a skid.

[0007] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the high-pressure intake gas of the ejector comes from the high-pressure natural gas in the outlet manifold of the compressor mainline compressor of the compressor station. The gas pressure entering the ejector is regulated by the flow regulating valve. The low-pressure intake gas of the ejector comes from the dry gas seal vent manifold of the mainline compressor. The gas exiting the ejector goes to the booster compressor. After being pressurized by the booster compressor, it goes to the inlet manifold of the compressor mainline compressor of the compressor station, thus completing the recycling. It is designed as a skid-mounted structure, which is convenient for fixed installation near the compressor plant.

[0008] Furthermore, an ejector outlet valve is provided on the pipeline between the ejector and the booster compressor, and the booster compressor is a single-stage compressor.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By using the ejector and the booster compressor in series, the booster compressor adopts single-stage compression, resulting in stable and efficient operation, and achieving economical and efficient operation of the dry gas sealing venting recovery of the compressor station's main line compressor. The booster compressor, using only single-stage compression, can meet the pressure requirements of the inlet manifold of the compressor station's main line compressor.

[0010] Furthermore, a booster compressor outlet check valve and a booster compressor outlet valve are provided on the pipeline between the booster compressor and the compressor station mainline compressor inlet manifold.

[0011] The beneficial effect of adopting the above-mentioned further technical solution is that the outlet of the booster compressor is equipped with a booster compressor outlet check valve to prevent gas backflow.

[0012] Furthermore, a dry gas seal venting manifold outlet valve is provided on the pipeline between the ejector and the dry gas seal venting manifold of the trunk compressor.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that it facilitates the opening and closing of the pipeline between the ejector and the dry gas seal venting manifold of the main compressor according to actual needs through the dry gas seal venting manifold outlet valve.

[0014] Furthermore, the dry gas seal vent manifold of the trunk compressor is connected to a self-operated back pressure valve, a safety valve, and a shut-off valve via pipelines, and the shut-off valve is connected to an automatic interlocking vent valve via pipelines.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: when the manifold pressure is higher than the set value, the booster compressor unit should operate at full load. When the manifold pressure continues to rise, the control system will issue an alarm and interlock to open the self-operated back pressure valve to discharge excess natural gas. When the manifold pressure continues to rise, the control system will trigger the automatic interlock vent valve to ensure that the manifold pressure does not exceed the limit and the back pressure of the dry gas sealing system is normal.

[0016] Furthermore, the set pressure of the self-operated back pressure valve is P1, the set pressure of the safety valve is P3, and the set pressure of the automatic interlocking vent valve is P2. <P2<P3。

[0017] The beneficial effects of adopting the above-mentioned further technical solution are as follows: when the manifold pressure is higher than the set value, the booster compressor unit should operate at full load. When the manifold pressure continues to rise, the control system will issue an alarm and interlock to open the self-operated back pressure valve to discharge excess natural gas. When the manifold pressure continues to rise, the control system will trigger the automatic interlock vent valve to ensure that the manifold pressure does not exceed the limit and the back pressure of the dry gas sealing system is normal.

[0018] Furthermore, the self-operated back pressure valve, the safety valve, and the automatic interlocking vent valve are all connected to a control system.

[0019] The beneficial effects of adopting the above-mentioned further technical solution are: the manifold is equipped with a safety valve, a self-operated back pressure valve and an automatic interlocking vent valve, and is connected to the atmosphere.

[0020] Furthermore, the dry gas seal venting manifold of the trunk compressor is connected to multiple dry gas seal venting pipes of the trunk compressor via pipelines.

[0021] The beneficial effect of adopting the above-mentioned further technical solution is that the dry gas seal venting manifold of the trunk compressor is formed by connecting the gas seal venting pipes of each trunk compressor.

[0022] Furthermore, the multiple dry gas seal venting pipes of the main compressors are a first dry gas seal venting pipe, a second dry gas seal venting pipe, and a third dry gas seal venting pipe. A first dry gas seal venting pipe check valve is provided on the pipeline between the first dry gas seal venting pipe and the dry gas seal venting manifold of the main compressor. A second dry gas seal venting pipe check valve is provided on the pipeline between the second dry gas seal venting pipe and the dry gas seal venting manifold of the main compressor. A third dry gas seal venting pipe check valve is provided on the pipeline between the third dry gas seal venting pipe and the dry gas seal venting manifold of the main compressor.

[0023] The beneficial effect of adopting the above-mentioned further technical solution is that: the dry gas seal venting manifold of the trunk compressor is formed by connecting the gas seal venting pipes of each trunk compressor, and a one-way valve is provided between the dry gas seal venting pipe of each trunk compressor and the dry gas seal venting manifold of the trunk compressor.

[0024] The advantages of this invention in its additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 A schematic diagram of the dry gas sealing venting and air recovery system of the compressor station trunk compressor provided in this embodiment of the utility model.

[0026] Reference numerals: 1. Compressor outlet manifold of main compressor at the compressor station; 2. Flow regulating valve; 3. Ejector; 4. Ejector outlet valve; 5. Booster compressor; 6. Booster compressor outlet check valve; 7. Booster compressor outlet valve; 8. Compressor inlet manifold of main compressor at the compressor station; 9. Dry gas seal vent manifold of main compressor; 10. Dry gas seal vent manifold outlet valve; 11. Self-operated back pressure valve; 12. Safety valve; 13. Shut-off valve; 14. Automatic interlock vent valve; 15. Check valve for first dry gas seal vent pipe; 16. Check valve for second dry gas seal vent pipe; 17. Check valve for third dry gas seal vent pipe; 18. Dry gas seal vent pipe for first main compressor; 19. Dry gas seal vent pipe for second main compressor; 20. Dry gas seal vent pipe for third main compressor. Detailed Implementation

[0027] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0028] like Figure 1 As shown, this utility model embodiment provides a dry gas seal venting recovery system for a compressor station trunk compressor, including: a compressor station trunk compressor outlet manifold 1, an ejector 3, a booster compressor 5, a compressor station trunk compressor inlet manifold 8, and a trunk compressor dry gas seal venting manifold 9. The compressor station trunk compressor outlet manifold 1 is connected to the ejector 3 via a pipeline. The ejector 3 is connected to the booster compressor 5 and the trunk compressor dry gas seal venting manifold 9 via pipelines. The booster compressor 5 is connected to the compressor station trunk compressor inlet manifold 8 via a pipeline.

[0029] The beneficial effects of this utility model's technical solution are as follows: Using an ejector connected in series with a booster compressor for vent air recovery enables economical and efficient recovery of dry gas seal vent air from the compressor station. The ejector's high-pressure intake comes from the high-pressure natural gas at the compressor station's main line compressor outlet manifold, while its low-pressure intake comes from the dry gas seal vent air manifold of the main line compressor. The ejector's outlet air goes to the booster compressor, where it is pressurized before returning to the compressor station's main line compressor inlet manifold, thus completing the recovery process. This reduces the direct venting of dry gas seal vent air from the compressor station's main line compressor, minimizing resource waste and achieving resource recycling.

[0030] In order to achieve the goal of economically and efficiently recovering the dry gas seal release air from the compressor of the air station, this utility model adopts the mode of ejector connected in series with booster compressor for release air recovery.

[0031] like Figure 1 As shown, Figure 1 The arrows in the diagram represent the direction and trajectory of gas flow. This utility model provides a dry gas seal vent recovery system for a compressor station trunk compressor, comprising valves, a process system, an ejector 3, a booster compressor 5, and a control system. The high-pressure intake of the ejector 3 comes from the high-pressure natural gas at the outlet manifold 1 of the compressor station trunk compressor. The flow regulating valve 2 adjusts the gas pressure entering the ejector 3. The low-pressure intake of the ejector 3 comes from the dry gas seal vent manifold 9 of the trunk compressor. The exhaust gas from the ejector 3 goes to the booster compressor 5, where it is pressurized before going to the inlet manifold 8 of the compressor station trunk compressor, thus completing the recovery process.

[0032] like Figure 1 As shown, further, a flow regulating valve 2 is provided on the pipeline between the outlet manifold 1 of the compressor station trunk compressor and the ejector 3. The outlet manifold 1 of the compressor station trunk compressor, the ejector 3, the booster compressor 5, the inlet manifold 8 of the compressor station trunk compressor, and the dry gas sealing vent manifold 9 of the trunk compressor are all installed on a skid.

[0033] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the high-pressure intake gas of the ejector comes from the high-pressure natural gas in the outlet manifold of the compressor mainline compressor of the compressor station. The gas pressure entering the ejector is regulated by the flow regulating valve. The low-pressure intake gas of the ejector comes from the dry gas seal vent manifold of the mainline compressor. The gas exiting the ejector goes to the booster compressor. After being pressurized by the booster compressor, it goes to the inlet manifold of the compressor mainline compressor of the compressor station, thus completing the recycling. It is designed as a skid-mounted structure, which is convenient for fixed installation near the compressor plant.

[0034] like Figure 1 As shown, further, an ejector outlet valve 4 is provided on the pipeline between the ejector 3 and the booster compressor 5, and the booster compressor 5 is a single-stage compressor.

[0035] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By using the ejector and the booster compressor in series, the booster compressor adopts single-stage compression, resulting in stable and efficient operation, and achieving economical and efficient operation of the dry gas sealing venting recovery of the compressor station's main line compressor. The booster compressor, using only single-stage compression, can meet the pressure requirements of the inlet manifold of the compressor station's main line compressor.

[0036] like Figure 1As shown, further, a booster compressor outlet check valve 6 and a booster compressor outlet valve 7 are provided on the pipeline between the booster compressor 5 and the compressor station main line compressor inlet manifold 8.

[0037] The beneficial effect of adopting the above-mentioned further technical solution is that the outlet of the booster compressor is equipped with a booster compressor outlet check valve to prevent gas backflow.

[0038] like Figure 1 As shown, further, a dry gas seal venting manifold outlet valve 10 is provided on the pipeline between the ejector 3 and the dry gas seal venting manifold 9 of the main compressor.

[0039] The beneficial effect of adopting the above-mentioned further technical solution is that it facilitates the opening and closing of the pipeline between the ejector and the dry gas seal venting manifold of the main compressor according to actual needs through the dry gas seal venting manifold outlet valve.

[0040] like Figure 1 As shown, further, the dry gas seal venting manifold 9 of the trunk compressor is connected to a self-operated back pressure valve 11, a safety valve 12 and a shut-off valve 13 via a pipeline, and the shut-off valve 13 is connected to an automatic interlocking venting valve 14 via a pipeline.

[0041] The beneficial effects of adopting the above-mentioned further technical solution are as follows: when the manifold pressure is higher than the set value, the booster compressor unit should operate at full load. When the manifold pressure continues to rise, the control system will issue an alarm and interlock to open the self-operated back pressure valve to discharge excess natural gas. When the manifold pressure continues to rise, the control system will trigger the automatic interlock vent valve to ensure that the manifold pressure does not exceed the limit and the back pressure of the dry gas sealing system is normal.

[0042] like Figure 1 As shown, further, the set pressure of the self-operated back pressure valve 11 is P1, the set pressure of the safety valve 12 is P3, and the set pressure of the automatic interlocking vent valve 14 is P2. <P2<P3。

[0043] The beneficial effects of adopting the above-mentioned further technical solution are as follows: when the manifold pressure is higher than the set value, the booster compressor unit should operate at full load. When the manifold pressure continues to rise, the control system will issue an alarm and interlock to open the self-operated back pressure valve to discharge excess natural gas. When the manifold pressure continues to rise, the control system will trigger the automatic interlock vent valve to ensure that the manifold pressure does not exceed the limit and the back pressure of the dry gas sealing system is normal.

[0044] like Figure 1 As shown, the self-operated back pressure valve 11, the safety valve 12, and the automatic interlocking vent valve 14 are all connected to a control system.

[0045] The beneficial effects of adopting the above-mentioned further technical solution are: the manifold is equipped with a safety valve, a self-operated back pressure valve and an automatic interlocking vent valve, and is connected to the atmosphere.

[0046] The control system can be connected to the dry gas seal vent manifold 9 of the main compressor.

[0047] It should be noted that the method of the control system to collect information from various components, compare and analyze the information from various components, calculate and generate results, and control various components according to the results is existing technology. Those skilled in the art can easily figure out how to program it according to actual needs, so it will not be elaborated here.

[0048] like Figure 1 As shown, further, the dry gas seal venting manifold 9 of the trunk compressor is connected to multiple dry gas seal venting pipes of the trunk compressor via pipelines.

[0049] The beneficial effect of adopting the above-mentioned further technical solution is that the dry gas seal venting manifold of the trunk compressor is formed by connecting the gas seal venting pipes of each trunk compressor.

[0050] like Figure 1 As shown, further, the multiple dry gas seal venting pipes of the main compressors are a first dry gas seal venting pipe 18, a second dry gas seal venting pipe 19, and a third dry gas seal venting pipe 20. A first dry gas seal venting pipe check valve 15 is provided on the pipeline between the first dry gas seal venting pipe 18 and the dry gas seal venting manifold 9 of the main compressor. A second dry gas seal venting pipe check valve 16 is provided on the pipeline between the second dry gas seal venting pipe 19 and the dry gas seal venting manifold 9 of the main compressor. A third dry gas seal venting pipe check valve 17 is provided on the pipeline between the third dry gas seal venting pipe 20 and the dry gas seal venting manifold 9 of the main compressor.

[0051] The beneficial effect of adopting the above-mentioned further technical solution is that: the dry gas seal venting manifold of the trunk compressor is formed by connecting the gas seal venting pipes of each trunk compressor, and a one-way valve is provided between the dry gas seal venting pipe of each trunk compressor and the dry gas seal venting manifold of the trunk compressor.

[0052] The dry gas seal venting recovery system for trunk compressors provided in this embodiment of the invention (dry gas seal venting recovery system for trunk compressors in air stations) is fully automatically controlled by a control system. The start and stop signals of the recovery system are controlled by the pressure of the dry gas seal venting manifold 9 of the trunk compressor. The control system has start / stop, ESD, and alarm / stop functions for operating parameters.

[0053] The dry gas seal vent header 9 of the main line compressor is connected by the gas seal vent pipes of each main line compressor (the first main line compressor dry gas seal vent pipe 18, the second main line compressor dry gas seal vent pipe 19, and the third main line compressor dry gas seal vent pipe 20). Check valves (the first dry gas seal vent pipe check valve 15, the second dry gas seal vent pipe check valve 16, and the third dry gas seal vent pipe check valve 17) are provided between each main line compressor dry gas seal vent pipe and the main line compressor dry gas seal vent header 9. Redundant temperature and pressure transmitters are provided on the header (the main line compressor dry gas seal vent header 9) for transmitting the vent process parameters to the control system. A safety valve 12, a self-operated backpressure valve 11, and an automatic interlock vent valve 14 are provided on the header and are connected to the atmosphere. The self-operated backpressure valve 11 (set pressure P1, i.e., the first pressure value), the automatic interlock vent valve 14 (set pressure P2, i.e., the second pressure value), the safety valve 12 (set pressure P3, i.e., the third pressure value), and the high alarm set pressure P4 (i.e., the fourth pressure value) of the first-stage dry gas seal vent have the following magnitude relationship: P1 < P2 < P3 < P4. When the header pressure is higher than the set value, the booster compression unit should operate at full load. When the header pressure continues to rise, the control system issues an alarm and interlocks to open the self-operated backpressure valve 11 to discharge the excess natural gas. When the header pressure still continues to rise, the control system will trigger the automatic interlock vent valve 14, thus ensuring that the header pressure does not exceed the limit and the backpressure of the dry gas seal system is normal.

[0054] The outlet of the header is connected to the low-pressure intake end of the ejector 3.

[0055] The booster compressor 5 consists of a motor, a booster compressor, an auxiliary system, etc. The power supply of the motor comes from the power distribution system of the compressor station. Since the outlet pressure of the ejector 3 is relatively high, reaching above 4 MPa, the booster compressor 5 can meet the pressure requirements of the inlet header 8 of the main line compressor in the injection compressor station with a single-stage compression.

[0056] A check valve 6 is provided at the outlet of the booster compressor 5 to prevent gas backflow.

[0057] The dry gas seal vent recovery system of the main line compressor (the dry gas seal vent recovery system of the compressor station of the main line compressor) is designed as a skid-mounted structure and is fixedly installed near the compressor workshop.

[0058] The utility model will significantly improve the recovery rate of the dry gas seal vent of the main line compressor in the compressor station, and significantly improve the economic efficiency of the dry gas seal vent recovery project of the main line compressor in the compressor station. It reduces the direct venting of the dry gas seal vent of the main line compressor in the compressor station, reduces resource waste, realizes resource recovery and utilization, and has good economic benefits.

[0059] By connecting the ejector and the booster compressor in series, the booster compressor 5 adopts a single-stage compression, which is stable and efficient in operation, and realizes the economical and efficient operation of the dry gas sealing venting recovery of the compressor station's main compressor.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dry gas sealing venting air recovery system for a compressor station trunk line compressor, characterized in that, include: The compressor station mainline compressor outlet manifold (1), ejector (3), booster compressor (5), compressor station mainline compressor inlet manifold (8), and mainline compressor dry gas seal vent manifold (9) are provided. The compressor station mainline compressor outlet manifold (1) is connected to the ejector (3) through a pipeline. The ejector (3) is connected to the booster compressor (5) and the mainline compressor dry gas seal vent manifold (9) through pipelines. The booster compressor (5) is connected to the compressor station mainline compressor inlet manifold (8) through a pipeline.

2. The dry gas sealing venting air recovery system for a compressor station trunk compressor according to claim 1, characterized in that, A flow regulating valve (2) is provided on the pipeline between the outlet manifold (1) of the compressor station trunk compressor and the ejector (3). The outlet manifold (1), the ejector (3), the booster compressor (5), the inlet manifold (8) of the compressor station trunk compressor, and the dry gas seal venting manifold (9) of the trunk compressor are all installed on a skid.

3. The dry gas sealing venting air recovery system for a compressor station trunk line compressor according to claim 1, characterized in that, An ejector outlet valve (4) is provided on the pipeline between the ejector (3) and the booster compressor (5), and the booster compressor (5) is a single-stage compressor.

4. The dry gas sealing venting air recovery system for a compressor station trunk line compressor according to claim 1, characterized in that, The pipeline between the booster compressor (5) and the compressor station trunk compressor inlet manifold (8) is equipped with a booster compressor outlet check valve (6) and a booster compressor outlet valve (7).

5. A dry gas sealing venting air recovery system for a compressor station trunk line compressor according to claim 1, characterized in that, A dry gas seal venting manifold outlet valve (10) is provided on the pipeline between the ejector (3) and the dry gas seal venting manifold (9) of the main compressor.

6. A dry gas sealing venting air recovery system for a compressor station trunk line compressor according to claim 1, characterized in that, The dry gas sealing vent manifold (9) of the trunk compressor is connected to a self-operated back pressure valve (11), a safety valve (12) and a shut-off valve (13) via a pipeline. The shut-off valve (13) is connected to an automatic interlock vent valve (14) via a pipeline.

7. A dry gas sealing venting air recovery system for a compressor station trunk compressor according to claim 6, characterized in that, The set pressure of the self-operated back pressure valve (11) is P1, the set pressure of the safety valve (12) is P3, and the set pressure of the automatic interlock vent valve (14) is P2. <P2<P3。 8. A dry gas sealing venting air recovery system for a compressor station trunk line compressor according to claim 6, characterized in that, The self-operated back pressure valve (11), the safety valve (12), and the automatic interlock vent valve (14) are all connected to a control system.

9. A dry gas sealing venting air recovery system for a compressor station trunk compressor according to claim 1, characterized in that, The dry gas seal venting manifold (9) of the trunk compressor is connected to multiple dry gas seal venting pipes of the trunk compressor via pipelines.

10. A dry gas sealing venting air recovery system for a compressor station trunk line compressor according to claim 9, characterized in that, The multiple dry gas seal venting pipes of the main line compressors are a first dry gas seal venting pipe (18), a second dry gas seal venting pipe (19), and a third dry gas seal venting pipe (20). A first dry gas seal venting pipe check valve (15) is provided on the pipe between the first dry gas seal venting pipe (18) and the dry gas seal venting manifold (9) of the main line compressor. A second dry gas seal venting pipe check valve (16) is provided on the pipe between the second dry gas seal venting pipe (19) and the dry gas seal venting manifold (9) of the main line compressor. A third dry gas seal venting pipe check valve (17) is provided on the pipe between the third dry gas seal venting pipe (20) and the dry gas seal venting manifold (9) of the main line compressor.

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