Natural gas station vented air recovery compressor system

Abstract

The utility model provides a natural gas station vent air recovery compressor system which is characterized in that a compressor inlet connecting short section is connected with a compressor inlet valve, the compressor inlet valve is connected with a recovery compressor system, the recovery compressor system is connected with a compressor outlet valve, and the compressor outlet valve is connected with a compressor outlet connecting short section; and the standby gas generator set is connected with the recovery compressor system. The existing resources of the natural gas station, namely the standby gas generator set, are used for providing power for the vent gas recovery operation, so that a large amount of equipment investment cost is saved, the return on investment period of a vent gas recovery project is remarkably shortened, and the economical efficiency of the vent gas recovery project is greatly improved. Natural gas of the to-be-vented system is pressurized through the recovery compressor system and then enters the vented gas receiving system to be reused. The arrangement of the compressor inlet connecting short section and the compressor outlet connecting short section is convenient for on-site quick installation.

Description

Technical Field

[0001] The utility model relates to the technical field of vented air recovery equipment for natural gas stations, in particular to a vented air recovery compressor system for natural gas stations. Background Art

[0002] Existing vent air recovery technologies or solutions for natural gas stations only consider utilizing external resources (external power supply, purchased gas generator sets or gas engines, etc.) for vent air recovery operations.

[0003] For example, Patent 1 discloses a "screw compression type petroleum associated gas recovery device" (CN208964870U), which mainly includes a screw air compressor, a gas-liquid separator, a temporary liquid storage tank, and a condensate treatment device. The system mainly uses a screw compressor to compress and recover the associated gas and condense it.

[0004] Patent 2 discloses an "integrated natural gas compression device" (CN203530268U), which includes a pre-compression unit, a gas processing unit, a three-stage boosting unit and an automatic control unit. The pre-compression unit serves as the pre-compression part, and the wellhead gas enters the next gas processing unit after pre-compression, pre-purification and cooling. The gas passes through the various components in the unit in turn, and then enters the three-stage boosting unit for pressurization and heat dissipation, and then outputs to the automatic control unit for automatic control. The device is used for the collection, purification, boosting and transportation of natural gas. It adopts a skid-mounted integrated structure, which can adapt to the needs of different conditions at the gas well development site and ensure the quality of on-site compression of natural gas.

[0005] Patent three discloses a "natural gas compression recovery and processing device" (CN207122404U), which includes one to six stages of compression devices and matching separators, etc., which can realize the recovery and processing of natural gas according to different needs. It is safe and reliable, convenient to operate, improves work efficiency and reduces production costs. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a natural gas station field vent air recovery compressor system in view of the deficiencies in the prior art.

[0007] The utility model provides a technical solution to the above technical problems as follows: a natural gas station air recovery compressor system, comprising: a compressor inlet connecting nipple, a compressor inlet valve, a recovery compressor system, a compressor outlet valve, a compressor outlet connecting nipple and a standby gas generator set, the compressor inlet connecting nipple is connected to the compressor inlet valve through a pipeline, the compressor inlet valve is connected to the recovery compressor system through a pipeline, the recovery compressor system is connected to the compressor outlet valve through a pipeline, the compressor outlet valve is connected to the compressor outlet connecting nipple through a pipeline, and the standby gas generator set is connected to the recovery compressor system.

[0008] The beneficial effects of adopting the technical solution of the utility model are: using the existing resources of the natural gas station, that is, the standby gas generator set to provide power for the vent air recovery operation, thereby saving a large amount of equipment investment costs, significantly shortening the investment return period of the vent air recovery project, and greatly improving the economic efficiency of the vent air recovery project. The natural gas in the venting system is pressurized by the recovery compressor system and then enters the vent air receiving system for reuse. The setting of the compressor inlet connecting short section and the compressor outlet connecting short section facilitates rapid installation on site.

[0009] Furthermore, the compressor inlet connecting nipple is connected to a system to be vented, and the compressor outlet connecting nipple is connected to a vented air receiving system.

[0010] The beneficial effect of adopting the above further technical solution is that the natural gas in the venting system is pressurized by the recovery compressor system and then enters the venting air receiving system for reuse, thereby improving the venting air recovery rate of the natural gas station and significantly improving the economic efficiency of the venting air recovery project.

[0011] Furthermore, the system to be vented is connected to a first ball valve of a venting pipeline of the system to be vented, and the system to be vented is connected to the compressor inlet connecting short section through the first ball valve of the venting pipeline of the system to be vented, and the vent air receiving system is connected to a first ball valve of a venting pipeline of the vent air receiving system, and the vent air receiving system is connected to the compressor outlet connecting short section through the first ball valve of the venting pipeline of the vent air receiving system.

[0012] The beneficial effect of adopting the above further technical solution is that the setting of the ball valve makes it easy to open and close the pipeline according to actual needs.

[0013] Furthermore, the system to be vented is a closed / isolated process system in the process flow of a natural gas station, or a closed / isolated process equipment, and the vented air receiving system is a process system with a vent pipeline and a vent valve that is in operation in the process flow of a natural gas station and is associated with the natural gas entry process.

[0014] The beneficial effect of adopting the above further technical solution is to expand the application scope of the natural gas station vent air recovery compressor system.

[0015] Furthermore, a closed / isolated process system or a closed / isolated process equipment is provided with a vent pipe and a vent valve.

[0016] The beneficial effect of adopting the above further technical solution is that the setting of the venting pipeline and the venting valve facilitates the venting work.

[0017] Furthermore, the recovery compressor system is a skid-mounted structure.

[0018] The beneficial effect of adopting the above further technical solution is that the recovery compressor system is designed as a skid-mounted structure that is easy to move, and the recovery compressor system can be transported to where there is natural gas that needs to be recovered to carry out the recovery operation. The structure is compact, which is convenient for moving, transporting and storing the recovery compressor system.

[0019] Furthermore, the recovery compressor system includes: a main motor, a hydraulic system, a hydraulic compressor, a cooling system, a control system, and a skid seat. The main motor, the hydraulic system, the hydraulic compressor, the cooling system, and the control system are all installed on the skid seat, and the main motor, the hydraulic system, the cooling system, and the control system are all connected to the hydraulic compressor.

[0020] The beneficial effect of adopting the above further technical solution is that the recovery compressor system adopts an automatic control system to achieve safe and efficient operation. The compressor power supply of the recovery compressor system comes from the station field standby gas generator set, and the existing standby gas generator set of the natural gas station is used to provide power for the station field vent air recovery compressor, which not only fully utilizes the existing resources, but also recycles resources, saves a lot of investment costs, and realizes economic and efficient resource recovery.

[0021] Furthermore, the skid seat is provided with a lifting lug, and the hydraulic compressor is a two-stage compression natural gas compressor.

[0022] The beneficial effect of adopting the above further technical solution is that the provision of the lifting lugs facilitates the lifting of the recovery compressor system.

[0023] Furthermore, the control system is connected to a control system distribution box, and the control system distribution box is connected to an explosion-proof cable quick connection box.

[0024] The beneficial effect of adopting the above further technical solution is that the design of the explosion-proof cable quick connection box is conducive to the rapid connection of cables, reduces on-site operation time, and greatly improves the work efficiency of the air recovery project.

[0025] Furthermore, the explosion-proof cable quick connection box is connected to a spare interface of the station distribution box.

[0026] The beneficial effect of adopting the above-mentioned further technical solution is: using the spare interface of the existing explosion-proof distribution box in the natural gas station to provide power for the control system, thereby saving a large amount of equipment investment costs, significantly shortening the investment payback period of the vented air recovery project, and greatly improving the economy of the vented air recovery project.

[0027] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of a natural gas station vent air recovery compressor system provided in an embodiment of the utility model.

[0029] Explanation of the figures: 1. System to be vented; 2. First ball valve of venting pipeline of system to be vented; 3. Connecting nipple of compressor inlet; 4. High-pressure hose of compressor inlet; 5. Valve of compressor inlet; 6. Recovery compressor system; 7. Outlet valve of compressor; 8. High-pressure hose of compressor outlet; 9. Connecting nipple of compressor outlet; 10. First ball valve of venting pipeline of venting air receiving system; 11. Venting air receiving system. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 As shown, an embodiment of the utility model provides a natural gas station field vent air recovery compressor system, including: a compressor inlet connecting pup joint 3, a compressor inlet valve 5, a recovery compressor system 6, a compressor outlet valve 7, a compressor outlet connecting pup joint 9 and a standby gas generator set, the compressor inlet connecting pup joint 3 is connected to the compressor inlet valve 5 through a pipeline, the compressor inlet valve 5 is connected to the recovery compressor system 6 through a pipeline, the recovery compressor system 6 is connected to the compressor outlet valve 7 through a pipeline, the compressor outlet valve 7 is connected to the compressor outlet connecting pup joint 9 through a pipeline, and the standby gas generator set is connected to the recovery compressor system 6.

[0032] The beneficial effects of adopting the technical solution of the utility model are: using the existing resources of the natural gas station, that is, the standby gas generator set to provide power for the vent air recovery operation, thereby saving a large amount of equipment investment costs, significantly shortening the investment return period of the vent air recovery project, and greatly improving the economic efficiency of the vent air recovery project. The natural gas in the venting system is pressurized by the recovery compressor system and then enters the vent air receiving system for reuse. The setting of the compressor inlet connecting short section and the compressor outlet connecting short section facilitates rapid installation on site.

[0033] The compressor inlet valve 5 and the compressor outlet valve 7 can both be electromagnetic valves. The arrows in the figure represent the flow direction and trajectory of the gas.

[0034] A one-way valve may be provided on the compressor inlet high-pressure hose 4 and the compressor outlet high-pressure hose 8. For example, a one-way valve may be provided on the pipeline between the compressor outlet high-pressure hose 3 and the compressor inlet valve 5, on the pipeline between the compressor inlet valve 5 and the recovery compressor system 6, on the pipeline between the compressor outlet valve 7 and the recovery compressor system 6, and / or on the pipeline between the compressor outlet connecting short section 9 and the compressor outlet valve 7 to achieve one-way gas flow among the venting system 1-the recovery compressor system 6-the venting air receiving system 11, prevent gas backflow, and improve the stability and reliability of the system.

[0035] The embodiment of the utility model provides a vented air recovery compressor system for a natural gas station, which includes three parts: a system to be vented 1, a recovery compressor system 6, and a vented air receiving system 11. The natural gas in the system to be vented 1 is pressurized by the recovery compressor system 6 and then enters the vented air receiving system 11 to be reused. By utilizing the existing resources (backup gas generator sets) of the natural gas station and through scientific and reasonable equipment selection, an explosion-proof motor hydraulic compressor unit is formed to achieve the purpose of economical and efficient vented air recovery. It is safe and reliable, energy-saving and environmentally friendly, and easy to operate, which will significantly improve the vented air recovery rate of the natural gas station and significantly improve the economy of the vented air recovery project. It reduces the equipment investment cost and improves the vented air recovery rate.

[0036] The recovery compressor system 6 is designed as a skid-mounted structure that is easy to move. Wherever there is natural gas that needs to be recovered, the recovery compressor system 6 can be transported there to carry out the recovery operation. The recovery compressor system 6 adopts an automatic control system to achieve safe and efficient operation. The compressor power supply of the recovery compressor system 6 comes from the station field standby gas generator set. The existing standby gas generator set of the natural gas station is used to provide power for the station field vent air recovery compressor, which not only fully utilizes the existing resources, but also recycles resources, saves a lot of investment costs, and realizes the economic and efficient recovery of resources. The promotion and application of this system (natural gas station field vent air recovery compressor system) will definitely play a positive role in protecting the environment, reducing methane emissions in the oil and gas industry, and reducing the atmospheric greenhouse gas effect.

[0037] like Figure 1 As shown, further, the compressor inlet connecting nipple 3 is connected to the system to be vented 1, and the compressor outlet connecting nipple 9 is connected to the vented air receiving system 11.

[0038] The beneficial effect of adopting the above further technical solution is that the natural gas in the venting system is pressurized by the recovery compressor system and then enters the venting air receiving system for reuse, thereby improving the venting air recovery rate of the natural gas station and significantly improving the economic efficiency of the venting air recovery project.

[0039] The compressor inlet connecting nipple 3 is connected to the compressor inlet valve 5 through the compressor inlet high-pressure hose 4, and the compressor outlet valve 7 is connected to the compressor outlet connecting nipple 9 through the compressor outlet high-pressure hose 8.

[0040] like Figure 1 As shown, further, the system to be vented 1 is connected to the first ball valve 2 of the venting pipeline of the system to be vented, and the system to be vented 1 is connected to the compressor inlet connecting short section 3 through the first ball valve 2 of the venting pipeline of the system to be vented, and the venting air receiving system 11 is connected to the first ball valve 10 of the venting pipeline of the venting air receiving system, and the venting air receiving system 11 is connected to the compressor outlet connecting short section 9 through the first ball valve 10 of the venting pipeline of the venting air receiving system.

[0041] The beneficial effect of adopting the above further technical solution is that the setting of the ball valve makes it easy to open and close the pipeline according to actual needs.

[0042] like Figure 1 As shown, further, the system to be vented 1 is a closed / isolated process system in the process flow of a natural gas station, or a closed / isolated process equipment, and the vented air receiving system 11 is a process system with a vent pipeline and a vent valve that is in operation in the process flow of the natural gas station and is associated with the natural gas entry process.

[0043] The beneficial effect of adopting the above further technical solution is to expand the application scope of the natural gas station vent air recovery compressor system.

[0044] Furthermore, a closed / isolated process system or a closed / isolated process equipment is provided with a vent pipe and a vent valve.

[0045] The beneficial effect of adopting the above further technical solution is that the setting of the venting pipeline and the venting valve facilitates the venting work.

[0046] Furthermore, the recovery compressor system 6 is a skid-mounted structure.

[0047] The beneficial effect of adopting the above further technical solution is that the recovery compressor system is designed as a skid-mounted structure that is easy to move, and the recovery compressor system can be transported to where there is natural gas that needs to be recovered to carry out the recovery operation. The structure is compact, which is convenient for moving, transporting and storing the recovery compressor system.

[0048] Furthermore, the recovery compressor system 6 includes: a main motor, a hydraulic system, a hydraulic compressor, a cooling system, a control system, and a skid seat. The main motor, the hydraulic system, the hydraulic compressor, the cooling system, and the control system are all installed on the skid seat, and the main motor, the hydraulic system, the cooling system, and the control system are all connected to the hydraulic compressor.

[0049] The beneficial effect of adopting the above further technical solution is that the recovery compressor system adopts an automatic control system to achieve safe and efficient operation. The compressor power supply of the recovery compressor system comes from the station field standby gas generator set, and the existing standby gas generator set of the natural gas station is used to provide power for the station field vent air recovery compressor, which not only fully utilizes the existing resources, but also recycles resources, saves a lot of investment costs, and realizes economic and efficient resource recovery.

[0050] The sled seat can be a plate or a car.

[0051] Furthermore, the skid seat is provided with a lifting lug, and the hydraulic compressor is a two-stage compression natural gas compressor.

[0052] The beneficial effect of adopting the above further technical solution is that the provision of the lifting lugs facilitates the lifting of the recovery compressor system.

[0053] Furthermore, the control system is connected to a control system distribution box, and the control system distribution box is connected to an explosion-proof cable quick connection box.

[0054] The beneficial effect of adopting the above further technical solution is that the design of the explosion-proof cable quick connection box is conducive to the rapid connection of cables, reduces on-site operation time, and greatly improves the work efficiency of the air recovery project.

[0055] Furthermore, the explosion-proof cable quick connection box is connected to a spare interface of the station distribution box.

[0056] The beneficial effect of adopting the above-mentioned further technical solution is: using the spare interface of the existing explosion-proof distribution box in the natural gas station to provide power for the control system, thereby saving a large amount of equipment investment costs, significantly shortening the investment payback period of the vented air recovery project, and greatly improving the economy of the vented air recovery project.

[0057] The vent air recovery system of the natural gas station is composed of three parts: the vent system 1, the recovery compressor system 6, and the vent air receiving system 11; the vent system 1 refers to a process system that can be closed / isolated or a closed / isolated process equipment in the process flow of the natural gas station, and the closed / isolated system or equipment has a vent pipe and a vent valve. The vent air receiving system 11 refers to a process system with a vent pipe and a vent valve that is in operation in the process flow of the natural gas station and is associated with the natural gas inlet process.

[0058] The recovery compressor system 6 is fully automatically controlled by the control system. The compressor start signal is manually issued, and the compressor stop signal is controlled by the compressor first-level intake pressure. The compressor control system has the functions of start and stop, emergency stop, and operating parameter alarm / shutdown.

[0059] Before the recovery operation begins, remove the pipe nipple after the first ball valve 2 of the venting pipeline of the venting system to be vented, install a special compressor inlet connecting nipple 3, and connect the special compressor inlet high-pressure hose 4 to the compressor inlet valve 5 after the compressor inlet connecting nipple 3. The compressor inlet connecting nipple 3 is pre-designed and manufactured into a series of small and large head nipple with different inlet diameters and uniform outlet diameters according to the diameter size of the venting pipeline of the natural gas station process system, so as to facilitate rapid installation on site. Remove the pipe nipple after the first ball valve 10 of the venting pipeline of the venting air receiving system, install a special compressor outlet connecting nipple 9, and connect the special compressor outlet high-pressure hose 8 to the compressor outlet valve 7 after the compressor outlet connecting nipple 9. The compressor outlet connecting nipple 9 is pre-designed and manufactured into a series of small and large head nipple with different outlet diameters and uniform inlet diameters according to the diameter size of the venting pipeline of the natural gas station process system, so as to facilitate rapid installation on site.

[0060] When the compressor is running, the control system issues a start command, and the compressor enters the running state after pre-lubrication, purging, and pressurization, and starts to operate by exhausting and pressurizing. The compressor shutdown is controlled by the first-stage intake pressure. When the first-stage intake pressure is lower than the set value, the compressor stops. The air recovery operation is completed.

[0061] The recovery compressor system 6 is composed of a main motor, a power supply system, a hydraulic system, a hydraulic compressor, a process system, a cooling system, a control system, an auxiliary system, etc. The main motor, the hydraulic system, the hydraulic compressor, the inlet and outlet valves, the cooling system, the control system, etc. are integrated on a skid. The skid is designed with lifting lugs for easy lifting.

[0062] The hydraulic compressor is a two-stage natural gas compressor that uses oil-free lubrication technology. The compressor consists of a two-stage hydraulic cylinder, filter, process pipeline, valve, etc. The hydraulic system consists of a hydraulic oil pump, oil tank, oil pipeline, reversing valve, etc.

[0063] The hydraulic compressor adopts the hydraulic principle and uses the main motor as the drive to drive the constant power hydraulic oil pump to transport the hydraulic oil to the hydraulic cylinder. The hydraulic cylinder's distance control element and the reversing valve are used for reversing, pushing the piston in the cylinder to reciprocate and compress natural gas. Its working process is: the natural gas from the venting system is taken in from the compressor's first-stage hydraulic cylinder air inlet, and is discharged from the first-stage hydraulic cylinder exhaust port after compression and enters the cooling system. After cooling, it enters the second-stage hydraulic cylinder air inlet, and is discharged from the second-stage hydraulic cylinder exhaust port after compression and enters the venting air receiving system.

[0064] The power supply system of the recovery compressor system 6 includes a station field standby gas generator set, an explosion-proof cable, an explosion-proof cable quick junction box, a control system distribution box, a station field distribution box, etc. The power supply of the main motor of the recovery compressor system comes from the station field standby gas generator set. The power supply of the control system comes from the standby interface of the station field distribution box. Before the recovery operation begins, disconnect the cable at the generator outlet of the station field standby gas generator set, connect a new explosion-proof cable to the explosion-proof cable quick junction box, and the cable from the explosion-proof cable quick junction box to the main motor inlet of the recovery compressor system is a pre-connected explosion-proof cable. The power supply of the control system distribution box is drawn out from the standby interface of the station field distribution box and enters the explosion-proof cable quick junction box. The cable between the explosion-proof cable quick junction box and the control system distribution box is a pre-connected explosion-proof cable.

[0065] The control system of the recycling compressor system is composed of PLC, soft starter, sensor, transmitter, instrument, solenoid valve, etc., which can realize the full automatic control of motor, cooling system, etc.

[0066] The startup logic control principle of the PLC program is: power on - equipment status self-check - manual / automatic control mode selection - control panel status judgment - open the compressor inlet and outlet electric control valves - cooling cycle and fan automatic start - oil pump start - system parameter judgment - compressor start.

[0067] Using the existing resources of the natural gas station (backup gas generator sets) to provide power for the vent air recovery operation saves a large amount of equipment investment costs, significantly shortens the investment payback period of the vent air recovery project, and greatly improves the economic efficiency of the vent air recovery project.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A natural gas station air recovery compressor system, characterized in that: include: A compressor inlet connecting nipple, a compressor inlet valve, a recovery compressor system, a compressor outlet valve, a compressor outlet connecting nipple and a standby gas generator set, wherein the compressor inlet connecting nipple is connected to the compressor inlet valve through a pipeline, the compressor inlet valve is connected to the recovery compressor system through a pipeline, the recovery compressor system is connected to the compressor outlet valve through a pipeline, the compressor outlet valve is connected to the compressor outlet connecting nipple through a pipeline, and the standby gas generator set is connected to the recovery compressor system.

2. A natural gas station air discharge compressor system according to claim 1, characterized in that: The compressor inlet connecting nipple is connected to a system to be vented, and the compressor outlet connecting nipple is connected to a vented air receiving system.

3. A natural gas station air discharge air recovery compressor system according to claim 2, characterized in that: The system to be vented is connected to the first ball valve of the venting pipeline of the system to be vented, and the system to be vented is connected to the compressor inlet connecting nipple through the first ball valve of the venting pipeline of the system to be vented. The venting air receiving system is connected to the first ball valve of the venting pipeline of the venting air receiving system, and the venting air receiving system is connected to the compressor outlet connecting nipple through the first ball valve of the venting pipeline of the venting air receiving system.

4. A natural gas station air discharge air recovery compressor system according to claim 2, characterized in that: The system to be vented is a closed / isolated process system in the process flow of a natural gas station, or a closed / isolated process equipment, and the vented air receiving system is a process system with a vent pipeline and a vent valve that is in operation in the process flow of a natural gas station and is associated with the natural gas entry process.

5. A natural gas station air discharge recovery compressor system according to claim 4, characterized in that: A closed / isolated process system or a closed / isolated process equipment is equipped with a vent pipe and a vent valve.

6. A natural gas station air discharge air recovery compressor system according to claim 1, characterized in that: The recovery compressor system is a skid-mounted structure.

7. A natural gas station air discharge air recovery compressor system according to claim 1, characterized in that: The recovery compressor system includes: a main motor, a hydraulic system, a hydraulic compressor, a cooling system, a control system, and a skid seat. The main motor, the hydraulic system, the hydraulic compressor, the cooling system, and the control system are all installed on the skid seat, and the main motor, the hydraulic system, the cooling system, and the control system are all connected to the hydraulic compressor.

8. A natural gas station air discharge air recovery compressor system according to claim 7, characterized in that: The skid seat is provided with a lifting lug, and the hydraulic compressor is a two-stage compression natural gas compressor.

9. A natural gas station air discharge recovery compressor system according to claim 7, characterized in that: The control system is connected to a control system distribution box, and the control system distribution box is connected to an explosion-proof cable quick connection box.

10. A natural gas station air discharge recovery compressor system according to claim 9, characterized in that: The explosion-proof cable quick junction box is connected to the spare interface of the station distribution box.

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