CN-122015007-A - Natural gas's blowdown recovery unit

Abstract

The application discloses a natural gas emptying and recycling device, relates to the technical field of natural gas emptying equipment, and aims to solve the problem of how to improve the stability of a gas supply state when the natural gas emptying and recycling device supplies gas to a downstream user. The emptying recovery device comprises an emptying structure, an air inlet structure, an air outlet structure, a first pipeline assembly and a second pipeline assembly, wherein the first pipeline assembly and the second pipeline assembly are connected in parallel between the air inlet structure and the air outlet structure, the emptying structure is connected with the second pipeline assembly, and the first pipeline assembly comprises a pressure regulating device so as to improve the stability of the air supply state when the emptying recovery device supplies air to a downstream user.

Inventors

• GAO HUI
• ZHANG BINGQIANG
• JIANG FEI
• ZHOU YONGBIN

Assignees

• 国家石油天然气管网集团有限公司
• 国家管网集团北方管道有限责任公司

Dates

Publication Date

20260512

Application Date

20260330

Claims (10)

1. 1. The utility model provides a natural gas's blowdown recovery device, its characterized in that includes blowdown structure, air inlet structure, exhaust structure and parallelly connected in air inlet structure with first pipeline subassembly and second pipeline subassembly between the exhaust structure, blowdown structure with second pipeline subassembly is connected, first pipeline subassembly includes pressure regulating device.
2. 2. The vent recovery device of claim 1, wherein the pressure regulating device comprises at least one pressure regulating valve.
3. 3. The vent recovery device of claim 2, wherein the number of said pressure regulating valves is at least two, and at least two of said pressure regulating valves are arranged in series.
4. 4. The vent recovery device of claim 1, wherein the second conduit assembly comprises a flow diverter comprising a speed increasing structure and a speed decreasing structure; the air inlet structure is arranged between the air outlet structure and the air inlet structure, the speed reducing structure is arranged between the speed increasing structure and the air outlet structure, the cross section area of the speed increasing structure is gradually reduced, and the cross section area of the speed reducing structure is gradually increased; One end of the emptying structure is communicated with a part between the speed increasing structure and the speed reducing structure, or one end of the emptying structure is communicated with the end part, facing the speed increasing structure, of the speed reducing structure.
5. 5. The vent recovery device of claim 4, wherein the flow guide further comprises a cartridge comprising a first cartridge portion and a second cartridge portion positioned between the first cartridge portion and the vent structure, at least a portion of the second cartridge portion forming the deceleration structure, the acceleration structure being housed within the first cartridge portion and enclosing a transition chamber with the first cartridge portion, the transition chamber communicating with a portion between the acceleration structure and the deceleration structure; The one end of the vent structure is communicated with the transition cavity.
6. 6. The vent recovery device of claim 4, wherein the second conduit assembly further comprises a first on-off valve connected between the flow guide and the air intake structure; And/or, the second pipeline assembly further comprises a second switch valve, and the second switch valve is connected between the drainage piece and the exhaust structure.
7. 7. The vent recovery device of any one of claims 1-6, wherein the vent recovery device comprises a flow detection assembly for detecting a flow of the exhaust structure.
8. 8. The vent recovery device of claim 7, wherein the flow sensing assembly comprises a first sensing member coupled to the vent structure; and/or, the flow detection assembly further comprises a second detection piece, and the second detection piece is connected with the air inlet structure.
9. 9. The vent recovery device of any one of claims 1-6, further comprising a pressure sensing member connected to one of the first conduit assembly, the second conduit assembly, and the exhaust structure for sensing an exhaust pressure of the exhaust structure.
10. 10. The vent recovery device of any one of claims 1-6, further comprising a controller electrically connected to the pressure regulator for controlling the pressure regulator to regulate the supply air pressure of the first conduit assembly to control the exhaust pressure of the exhaust structure.

Description

Natural gas's blowdown recovery unit Technical Field The application relates to the technical field of natural gas emptying equipment, in particular to a natural gas emptying and recycling device. Background The natural gas branch conveying station is used for conveying natural gas of a natural gas main pipe to downstream users, and natural gas in the branch conveying station needs to be emptied in the overhaul and maintenance processes of the branch conveying station. In the prior art, in order to avoid resource waste, the natural gas exhausted by a separate transmission station is usually conveyed to a downstream user through an exhaust recovery device. However, due to structural defects of the emptying recovery device, fluctuation of the natural gas supply state occurs when natural gas at the distribution and delivery station is delivered to downstream users. Disclosure of Invention The application aims to provide a natural gas emptying and recycling device, which aims to solve the problem of how to improve the stability of the gas supply state when the natural gas emptying and recycling device supplies gas to downstream users. The application provides a natural gas emptying and recycling device which comprises an emptying structure, an air inlet structure, an air outlet structure, a first pipeline assembly and a second pipeline assembly which are connected in parallel between the air inlet structure and the air outlet structure, wherein the emptying structure is connected with the second pipeline assembly, and the first pipeline assembly comprises a pressure regulating device. In the above scheme, since the first pipeline assembly and the second pipeline assembly are connected in parallel between the air inlet structure and the air outlet structure, air is supplied through the first pipeline assembly and the second pipeline assembly and the air outlet structure at the same time. When the air supply state of the second pipeline assembly fluctuates due to fluctuation of the state of the air discharge structure, the air supply state of the first pipeline assembly can be regulated through the pressure regulating device in the first pipeline assembly so as to compensate the fluctuation of the air supply state of the second pipeline assembly, ensure the stability of the air supply state of the air discharge structure, and further improve the stability of the state when the air discharge recovery device supplies air to a downstream user. Optionally, the pressure regulating device comprises at least one pressure regulating valve. Optionally, the number of the pressure regulating valves is at least two, and at least two pressure regulating valves are arranged in series. Optionally, the second pipeline assembly comprises a drainage piece, the drainage piece comprises a speed increasing structure and a speed reducing structure, the speed reducing structure is located between the speed increasing structure and the air exhausting structure from the air inlet structure to the air exhausting structure, the cross section area of the speed increasing structure is gradually reduced, the cross section area of the speed reducing structure is gradually increased, one end of the emptying structure is communicated with a part between the speed increasing structure and the speed reducing structure, or one end of the emptying structure is communicated with the end of the speed reducing structure facing the speed increasing structure. Optionally, the drainage piece further comprises a tube shell, the tube shell comprises a first tube shell part and a second tube shell part positioned between the first tube shell part and the exhaust structure, at least part of the second tube shell part forms the speed reducing structure, the speed increasing structure is accommodated in the first tube shell part, a transition cavity is enclosed between the speed increasing structure and the first tube shell part, the transition cavity is communicated with a part between the speed increasing structure and the speed reducing structure, and one end of the emptying structure is communicated with the transition cavity. Optionally, the second pipeline assembly further comprises a first switch valve connected between the drainage piece and the air inlet structure, and/or the second pipeline assembly further comprises a second switch valve connected between the drainage piece and the air outlet structure. Optionally, the vent recovery device includes a flow detection assembly for detecting a flow rate of the exhaust structure. Optionally, the flow detection assembly comprises a first detection member connected to the vent structure, and/or a second detection member connected to the air intake structure. Optionally, the vent recovery device further includes a pressure detecting member connected to one of the first pipe assembly, the second pipe assembly and the exhaust structure for detecting an exhaust pressure of the exhaust structure. Optionally, the