CN108758331B - Oil return overpressure detection and relief device of hydraulic piston type natural gas compressor unit - Google Patents

Oil return overpressure detection and relief device of hydraulic piston type natural gas compressor unit Download PDF

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Publication number
CN108758331B
CN108758331B CN201810425340.7A CN201810425340A CN108758331B CN 108758331 B CN108758331 B CN 108758331B CN 201810425340 A CN201810425340 A CN 201810425340A CN 108758331 B CN108758331 B CN 108758331B
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China
Prior art keywords
oil
pressure
natural gas
hydraulic
tank
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CN201810425340.7A
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Chinese (zh)
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CN108758331A (en
Inventor
杨超
高荣刚
刘政
张锋
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Jereh Oil and Gas Engineering Corp
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Jereh Oil and Gas Engineering Corp
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Priority to CN201810425340.7A priority Critical patent/CN108758331B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/008—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being a fluid transmission link
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F17C2227/0164—Compressors with specified compressor type, e.g. piston or impulsive type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/065—Fluid distribution for refueling vehicle fuel tanks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention provides an oil return overpressure detection and relief device of a hydraulic piston type natural gas compressor unit, which comprises a hydraulic oil buffer tank, wherein the hydraulic oil buffer tank is arranged in an oil return pipeline of the hydraulic piston type natural gas compressor unit, hydraulic oil flows out of a compression cylinder and then flows through an oil cooler and an oil return filter through the oil return pipeline to return to an oil tank, the hydraulic oil buffer tank is connected with the oil return pipeline, the hydraulic oil buffer tank is connected with a pressure difference alarm device and an in-tank air pressure detection device, and the hydraulic oil flows through the hydraulic oil buffer tank and then sequentially flows through the oil cooler and the oil. The hydraulic piston type natural gas compressor unit can monitor the sealing ring in the compression cylinder in the operation process, and if high-pressure natural gas leaks into a hydraulic system due to sealing damage, the high-pressure natural gas can be timely and safely discharged, so that safety accidents caused by equipment damage and natural gas leakage are avoided.

Description

Oil return overpressure detection and relief device of hydraulic piston type natural gas compressor unit
Technical Field
The invention relates to the technical field of compressed natural gas filling stations, in particular to an oil return overpressure detection and relief device of a hydraulic piston type natural gas compressor unit.
Background
Compressed Natural Gas (CNG) is one of the main alternatives to conventional fuels as a clean green energy source. The compressor of the CNG gas filling substation in the CNG industry generally adopts a hydraulic pump to pump high-pressure hydraulic oil, so that a piston head is driven to move, natural gas (hereinafter referred to as a gas cavity) in the natural gas cavity is compressed and pressurized, and a hydraulic oil cavity (hereinafter referred to as an oil cavity) is sealed with the gas cavity through a sealing ring, so that an isolation effect is realized. There are two main drawbacks to this approach:
a. if the sealing washer became invalid, high-pressure natural gas can follow hydraulic oil and get back to the oil tank, can cause scattered or the oil tank to burst at this in-process, and the revealing of natural gas also easily produces great incident simultaneously.
b. Because the sealing washer is in the compression cylinder, unable effectual control prevention can only appear revealing in a large number and can discover, change the increase of risk factor at this moment, and can't accomplish in time to overhaul, in time the prevention.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the oil return overpressure detection relief device of the hydraulic piston type natural gas compressor unit, so that the hydraulic piston type natural gas compressor unit can monitor the sealing ring in the compression cylinder in the operation process, and if high-pressure natural gas leaks into a hydraulic system due to sealing damage, the high-pressure natural gas can be timely and safely released, and safety accidents caused by equipment damage and natural gas leakage are avoided.
The aim of the invention is achieved by the following technical measures:
a hydraulic piston type natural gas compressor unit oil return overpressure detection relief device comprises a hydraulic oil buffer tank arranged in an oil return pipeline of the hydraulic piston type natural gas compressor unit, the hydraulic oil flows out of the compression cylinder and then returns to the oil tank through the oil cooler and the oil return filter through the oil return pipeline, the hydraulic oil buffer tank is connected with an oil return pipeline, the hydraulic oil buffer tank is connected with a pressure difference alarm device and an in-tank air pressure detection device, hydraulic oil flows through the hydraulic oil buffer tank and then sequentially flows through the oil cooler and the oil return filter to reach the oil tank, the pressure difference alarm device comprises a micro pressure difference switch and an alarm, the micro pressure difference switch is connected with the alarm, the micro pressure difference switch is connected with a hydraulic oil buffer tank to detect the air pressure in the tank, the micro pressure difference switch detects the air pressure in the tank and compares the air pressure with the atmospheric pressure, and the difference value between the air pressure in the tank and the atmospheric pressure exceeds a set pressure value, so that an alarm can be given.
Furthermore, the in-tank air pressure detection device comprises an air pressure gauge, the air pressure gauge is connected with the hydraulic oil buffer tank, and the air pressure gauge detects the air pressure in the hydraulic oil buffer tank to display a pressure value.
Further, jar internal gas pressure detection device includes the relief valve, and the relief valve is connected with the hydraulic oil buffer tank, can carry out safe discharge alone to the natural gas when pressure superelevation, and protection rear end oil cooler and oil tank prevent that oil cooler and oil tank pressurized from bursting and take place danger.
Compared with the prior art, the invention has the beneficial effects that:
the oil return pressure real-time detection is realized, the pressure difference alarm device can realize the abrasion leakage detection of the sealing ring of the compression cylinder, the safety valve can realize the automatic and safe discharge when a large amount of natural gas is leaked, the safe and stable operation of the whole equipment and a plant station is ensured, and an owner can be reminded to overhaul and maintain the sealing ring in time.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The device comprises a hydraulic oil buffer tank 1, a micro differential pressure switch 2, an alarm 3, an alarm 4, a safety valve 5, a pressure gauge 6, an oil cooler 7, an oil return filter 8, an oil tank 9, a compression cylinder 10 and an oil return pipeline.
Detailed Description
As shown in fig. 1, the hydraulic piston type natural gas compressor unit mainly comprises a hydraulic system, a compression cylinder system, a cooling system and a control system. The piston head in the compression cylinder 9 is pushed to move through high-pressure hydraulic oil to compress natural gas, and the hydraulic system and the compressed natural gas are sealed in the compression cylinder 9 by virtue of a sealing ring. The invention relates to an oil return overpressure detection and relief device of a hydraulic piston type natural gas compressor unit, which comprises a hydraulic oil buffer tank 1 arranged in an oil return pipeline 10 of the hydraulic piston type natural gas compressor unit, wherein hydraulic oil flows out of a compression cylinder 9 and then sequentially flows through the hydraulic oil buffer tank 1, an oil cooler 6 and an oil return filter 7 through the oil return pipeline 10 to return to an oil tank 8, the hydraulic oil buffer tank 1 is connected with the oil return pipeline 10, and the hydraulic oil buffer tank 1 is connected with a pressure difference alarm device and an in-tank air pressure detection device.
The tank internal air pressure detection device comprises a safety valve 4, the safety valve 4 is connected with the hydraulic oil buffer tank 1, the natural gas can be discharged independently and safely when the pressure is ultrahigh, the rear-end oil cooler 6 and the oil tank 8 are protected, and the oil cooler 6 and the oil tank 8 are prevented from being burst under pressure to cause danger.
The pressure difference alarm device comprises a micro pressure difference switch 2 and an alarm 3, the micro pressure difference switch 2 is connected with the alarm 3, the micro pressure difference switch 2 is connected with a hydraulic oil buffer tank 1 to detect the air pressure in the tank, the micro pressure difference switch 2 detects the air pressure in the tank and compares the air pressure with the atmospheric pressure, and the difference value between the air pressure in the tank and the atmospheric pressure exceeds a set pressure value, so that an alarm can be given.
The in-tank air pressure detection device comprises an air pressure gauge 5, the air pressure gauge 5 is connected with the hydraulic oil buffer tank 1, and the air pressure gauge 5 detects the air pressure in the hydraulic oil buffer tank 1 to display a pressure value.
The micro differential pressure switch 2 plays a detection role, the damage of the sealing ring is generally caused by long-time abrasion, trace natural gas is leaked in the early stage of the damage, one end of the working principle of the micro differential pressure switch 2 is used for detecting the pressure in the hydraulic oil buffer tank 1, the other end of the working principle of the micro differential pressure switch detects the atmospheric pressure, when the difference value between the two exceeds a set pressure value, the switch of the alarm 3 is triggered to give an alarm, the sealing ring is reminded to start to be leaked, and the sealing ring. The pressure gauge 5 can display the pressure value in the hydraulic oil buffer tank 1 in real time, so that observation is facilitated. The relief valve 4 plays the effect of safe diffusion, if the sealing washer damages seriously, when a large amount of CNG revealed hydraulic oil, can carry out safe releasing through relief valve 4, plays the guard action. The setting of manometer 5 can realize return oil pressure's real-time detection.
High-pressure hydraulic oil is pumped into the oil cavity through the pump to push the piston head to move upwards, and when oil is returned, if a sealing ring on the piston head is damaged, natural gas enters the oil return pipeline 10 along with the hydraulic oil. Theoretically, the return oil is free of back pressure, i.e. the return oil is free of pressure, since it is returned to the tank 8. If natural gas leaks and is mixed in hydraulic oil and flows back to the hydraulic oil buffer tank 1, the pressure of the hydraulic oil buffer tank 1 can rise instantly, a micro differential pressure can be used for alarming, if the natural gas continues to rise, the safety valve 4 can jump to perform final safety protection, and the system is prevented from being damaged due to overhigh pressure.

Claims (3)

1. The utility model provides a hydraulic piston natural gas compressor unit oil return superpressure detects bleeder mechanism, sets up in hydraulic piston natural gas compressor unit's oil return pipeline, and hydraulic oil flows through oil cooler and oil return filter and gets back to the oil tank, its characterized in that through returning oil pipeline after the compression cylinder flows out: including the hydraulic oil buffer tank, the hydraulic oil buffer tank with return oil pipe way and be connected, the hydraulic oil buffer tank is connected with pressure differential alarm device and jar interior air pressure detection device, and hydraulic oil flows through earlier behind the hydraulic oil buffer tank and flows through oil cooler and oil return filter arrival oil tank in proper order again, pressure differential alarm device includes trace pressure difference switch and alarm, and trace pressure difference switch is connected with the hydraulic oil buffer tank and is detected jar interior atmospheric pressure, and trace pressure difference switch detects jar interior atmospheric pressure and carries out the contrast, and the difference of jar internal pressure and atmospheric pressure surpasss and sets up the pressure value and.
2. The oil return overpressure detection relief device of the hydraulic piston type natural gas compressor unit as claimed in claim 1, characterized in that: the in-tank air pressure detection device comprises an air pressure meter, the air pressure meter is connected with the hydraulic oil buffer tank, and the air pressure meter detects the air pressure in the hydraulic oil buffer tank to display a pressure value.
3. The oil return overpressure detection relief device of the hydraulic piston type natural gas compressor unit as claimed in claim 1, characterized in that: the in-tank air pressure detection device comprises a safety valve, the safety valve is connected with a hydraulic oil buffer tank, natural gas can be discharged independently and safely when the pressure is ultrahigh, a rear-end oil cooler and an oil tank are protected, and the oil cooler and the oil tank are prevented from being burst under pressure to cause danger.
CN201810425340.7A 2018-05-07 2018-05-07 Oil return overpressure detection and relief device of hydraulic piston type natural gas compressor unit Active CN108758331B (en)

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CN201810425340.7A CN108758331B (en) 2018-05-07 2018-05-07 Oil return overpressure detection and relief device of hydraulic piston type natural gas compressor unit

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Application Number Priority Date Filing Date Title
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CN108758331B true CN108758331B (en) 2021-04-02

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CN109876672A (en) * 2019-04-12 2019-06-14 西安热工研究院有限公司 A kind of method and apparatus of precision processing powdex leakage on-line monitoring

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CN101839391B (en) * 2009-03-16 2011-08-10 安瑞科(廊坊)能源装备集成有限公司 Hydraulic compressed natural gas filling device and gas filling control method
CN201593488U (en) * 2009-12-30 2010-09-29 四川金星压缩机制造有限公司 Hydraulic piston type gas compressor for natural gas secondary filling stations
CN201884239U (en) * 2010-12-15 2011-06-29 四川金星石油化工机械设备有限公司 Hydraulic type free piston compressor
GB2487790A (en) * 2011-02-07 2012-08-08 Re Hydrogen Ltd Gas compressor using liquid
CN203081908U (en) * 2012-12-18 2013-07-24 中国石油天然气股份有限公司 Automatic oil-supplying hydraulic oil tank
US9228574B2 (en) * 2013-02-27 2016-01-05 Caterpillar Inc. Hydraulic relief and switching logic for cryogenic pump system
CN105526491B (en) * 2014-09-29 2023-03-31 安瑞科(廊坊)能源装备集成有限公司 Hydraulic natural gas filling for automobile substation oil return system and oil return method
CN204327469U (en) * 2014-11-17 2015-05-13 杰瑞石油天然气工程有限公司 Gas compressor set

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