CN204268067U - A kind of LNG gas reclaims energy saving device - Google Patents
A kind of LNG gas reclaims energy saving device Download PDFInfo
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- CN204268067U CN204268067U CN201420579837.1U CN201420579837U CN204268067U CN 204268067 U CN204268067 U CN 204268067U CN 201420579837 U CN201420579837 U CN 201420579837U CN 204268067 U CN204268067 U CN 204268067U
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Abstract
The utility model discloses a kind of LNG gas and reclaim energy saving device, comprise the cryogenic globe valve be arranged on LNG storage tank floss hole pipeline, on the pipeline of cryogenic globe valve rear end, interference is connected with stop valve flange; Draw two pipelines by stop valve flange, a pipeline is wherein connected to user's pipe network through vaporizer and pressure governor, the manual ball valve be promptly vented when another pipeline is provided with for controlling LNG storage tank overpressure successively.The utility model is under LNG storage tank and the operation with pressure of gas distributing system system, the condition that can not get angry in inflammable and explosive deathtrap, utilize common stop valve, carbon steel tube and field apparatus pipe fitting etc., the LNG gas that daily LNG storage tank can be emitted by flange and screwed connection is recycled again, thus cost-saving, avoids stop valve to damage, prevent On Lng Leakage, have practical, easy to use, with low cost, the outstanding features such as using effect is good, and economic benefit is high.
Description
Technical field
The utility model relates to a kind of liquefied natural gas plant emptying gas recovery technology, is specifically related to a kind of LNG gas and reclaims energy saving device.
Background technique
LNG Liquefied natural gas is a kind of cryogenic liquid fuel, and volume is about with amount gaseous natural gas volume 1/600, and main component is by methane (CH
4), be mainly used as fuel, have that calorific value is large, performance high.LNG Liquefied natural gas is convenient to storage, transport, and LNG Liquefied natural gas is stored in cryogenic tank, is all generally to be transported by LNG tank car, is then filled in cryogenic tank.Current matching used low-temperature pressure container with it, as portable LNG tank car, fixed LNG storage tank, tank container etc. also obtain fast development.These special equipments each carried out a third pary certification to 6 years, must replace residual gas in tank during third pary certification; Owing to being subject to the impact of ambient temperature in special equipment using process, liquid naturally volatilize produce flash steam cause tank inner pressure to raise gradually, therefore also must carry out periodic exhaustion to gas in tank.
Under LNG storage tank is generally all in outdoor outdoor state, storage tank is subject to the impact of ambient temperature and produces evaporation BOG gas, raise to cause LNG pressure in storage tank, these gases are general first through air temperature type vaporizer, through with air heat-exchange after specific gravity of natural gas can be less than air, directly be disposed in the air by outdoor emptying house steward again, easily will spread after high point diffuses, thus not easily form explosive mixture.The pipeline of general connection LNG gas is the low temperature resistant stainless steel pipeline of OCr18Ni9.
According to country's " safe technology of pressure vessel Supervision Code " regulation, gas in necessary emptying tank during pressurized container third pary certification, storage tank uses pressure not allow to exceed design pressure, to ensure storage tank security of operation.Due to LNG storage tank and the operation with pressure of gas distributing system system, LNG gas is inflammable and explosive, dangerous large, urban d evelopment environment is harsh, output investment ratio is larger, enforcement difficulty is large, and liquefied natural gas boiloff gas in residual gas and tank is generally all directly disposed in the air by the equipment such as present domestic LNG storage tank, and almost nobody reclaims.20m according to investigations
3storage tank discharge liquid every day is about 0.01m
3, folding synthetic gas is about 6.2m
3, general pressure is 0.5MPa.The main component of LNG Liquefied natural gas is by methane (CH
4), the methane of discharge is about 20 times of carbon dioxide on atmospheric impact, and also unsafe factor served by band simultaneously, rock gas mixes with air, explosion limit is 5% ~ 15%, and serious environment pollution and the physical and mental health affecting employee, a large amount of LNG gas is wasted.
Model utility content
The purpose of this utility model is for above-mentioned the problems of the prior art, there is provided one in LNG storage tank and the operation with pressure of gas distributing system system, do not implement fire operation in inflammable and explosive deathtrap, the LNG gas that daily LNG storage tank can be emitted is recycled again, thus it is cost-saving, and avoid cryogenic globe valve to damage and bring maintenance difficulty and unsafe factor, prevent the LNG gas of On Lng Leakage from reclaiming energy saving device.
To achieve these goals, the technical solution adopted in the utility model is: comprise the cryogenic globe valve be arranged on LNG storage tank floss hole pipeline, and on the pipeline of cryogenic globe valve rear end, interference is connected with stop valve flange; Draw two pipelines by stop valve flange, a pipeline is wherein connected to user's pipe network through vaporizer and pressure governor, the manual ball valve be promptly vented when another pipeline is provided with for controlling LNG storage tank overpressure successively.
Described stop valve flange is that stop valve is dismantled after handwheel, to dismantle upper half part flange that nut and valve rod stay, and the former pipeline of the size of described valve rod and cryogenic globe valve rear end is measure-alike from middle flange connections.
Two pipelines that described stop valve flange is drawn are mutually vertical, and manual ball valve is arranged on immediately below stop valve flange.
The Flange Ball Valves of Non-follow control LNG flow rate of liquid is provided with between described stop valve flange and vaporizer.
The knock out drum carrying out voltage stabilizing for natural gas-storing is provided with between described vaporizer and pressure governor.
Described Flange Ball Valves, vaporizer, knock out drum, pressure governor and user's pipe network are connected by snakelike carbon steel tube prefabricated in advance between any two.
Compared with prior art, the utility model is by installing stop valve flange additional in LNG storage tank floss hole pipeline low-temperature stop valve rear end, the pipeline of stop valve flange and stop valve rear end adopts interference fit to prevent LNG Leakage Gas, stop transport owing to making natural gas system when storage tank runs and overhaul, implement programmed sequence of operations complexity, implement difficulty large, urban d evelopment environment is harsh, belong to the operation of one-level substantial risk, the Placement of interference fit makes assembly process meet the requirement of not getting angry in inflammable and explosive deathtrap; The utility model draws two pipelines by stop valve flange, the pipeline being connected to user's pipe network is provided with the air temperature type vaporizer for liquid natural body being heated into gaseous state, the rock gas of gaseous state consumes less in course of conveying, utilization ratio is higher, the rear end of vaporizer is also provided with pressure governor, pressure governor flows to user to after gas deceleration step-down, prevents that overpressure flow velocity is too fast brings harm to pipeline and equipment.Except being connected to the pipeline of user's pipe network, also add the pipeline for being promptly vented LNG storage tank, and on this pipeline, be provided with manual ball valve, the weight alleviating vertical duct is conducive to compared with stop valve, the emergency drain of gas when two-pass design is convenient to LNG storage tank overpressure, when being also convenient to tubular service, vaporizer discharge branch road gas purging, ensures that LNG storage tank pressure is no more than design load, is in safe operation state all the time simultaneously.The utility model is practical, easy to use, with low cost, and using effect is good, high financial profit.The utility model in use, can not cause any damage to LNG storage tank, can not impact, meet national requirements for environmental protection to surrounding environment; The impact of any safe, healthy aspect can not be caused operator, meet " occupational health management rules "; Can not have any impact to city planting ductwork, ensure that municipal gas pressure is stablized.Show after enforcement, the utility model can make LNG storage tank fill time lengthening to 1.5 times, the daily LNG gas emitted is recycled again, year saves LNG gas expense about 50,000 yuan, accident rate 0%, and stop valve can be avoided to damage, prevent leak of liquid from causing dangerous accident to occur.
Further, the utility model stop valve flange is formed by common stop valve process and remould, good with the matching degree of original pipeline, can be good at meeting structure needs.
Further, the utility model manual ball valve is arranged on immediately below stop valve flange, arranges on the same line, be vented rapidly, alleviate the weight of vertical duct under being convenient to LNG storage tank emergency because manual ball valve and LNG storage tank export.
Further, the utility model is provided with the Flange Ball Valves of Non-follow control LNG flow rate of liquid between stop valve flange and vaporizer, and LNG Leakage Gas when preventing screwed connection, pipeline removes and installs conveniently.
Further, the utility model is according to field working conditions determination Flange Ball Valves, vaporizer, knock out drum, pressure governor and user's pipe network size between any two, snakelike carbon steel tube prefabricated is in advance adopted to connect between which, get angry and bring unsafe factor to the gas distributing system system of operation with pressure in the scene that prevents, pipeline removes and installs also more convenient simultaneously.
Accompanying drawing explanation
Fig. 1 overall structure schematic diagram of the present utility model;
In accompanying drawing: 1.LNG storage tank; 2. cryogenic globe valve; 3. stop valve flange; 4. manual ball valve; 5. Flange Ball Valves; 6. vaporizer; 7. pressure governor; 8. user's pipe network; 9. knock out drum.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
See Fig. 1, the utility model comprises the cryogenic globe valve 2 be arranged on LNG storage tank 1 floss hole pipeline, on the pipeline of cryogenic globe valve 2 rear end, interference is connected with stop valve flange 3, stop valve flange 3 to be dismantled handwheel for common stop valve, upper half part flange after dismantle nut and valve rod from middle flange connections, and the former pipeline of the size of described valve rod and cryogenic globe valve 2 rear end is measure-alike; Orthogonal two pipelines are drawn by stop valve flange 3, a pipeline is wherein successively through Flange Ball Valves 5, vaporizer 6, knock out drum 9 and pressure governor 7 are connected to user's pipe network 8, the manual ball valve 4 be promptly vented when another pipeline is provided with for controlling LNG storage tank pressure height immediately below stop valve flange 3.
Whether a reserved just below floss hole of cryogenic globe valve 2 on LNG storage tank 1 floss hole pipeline, be full of and discharge remove pressure for measuring LNG storage tank 1; Valve rod is first that the common stop valve of DN15 is dismantled handwheel, nut between valve rod and flange by the utility model, open from flange connections, take down valve body and valve rod, only surplus first half flange, then be firmly installed on the Stainless Steel Tube below cryogenic globe valve 2, below cryogenic globe valve 2, the Placement of former Stainless Steel Tube and stop valve flange 3 can only adopt interference fit, second half flange of stop valve flange 3 welds with manual ball valve 4, Flange Ball Valves 5 in advance, is finally connected with stop valve flange 3.Wherein Flange Ball Valves 5, vaporizer 6, knock out drum 9, pressure governor 7 and user's pipe network 8 adopt snakelike carbon steel tube to connect between any two, and snakelike carbon steel tube is prefabricated between maintenance in advance according to field working conditions determination size.Vaporizer 6 is 50Nm
3/ h air temperature type vaporizer.Pressure governor 7 is outlet pressure 0.15 ~ 0.2MPa U.S. Fei Xier pressure regulator valve.
Because rock gas is inflammable and explosive, belong to the particularity of hazardous gas, under the condition can not got angry at the scene, storage tank will make natural gas system stoppage in transit maintenance when running, implement programmed sequence of operations complexity, enforcement difficulty is large, urban d evelopment environment is harsh, belong to the operation of one-level substantial risk, the utility model is by flange and screwed connection, daily for the LNG storage tank LNG gas emitted can be recycled again, thus it is cost-saving, and avoid cryogenic globe valve to damage, prevent On Lng Leakage, have practical, easy to use, with low cost, using effect is good, the outstanding features such as economic benefit is high.
Claims (6)
1. a LNG gas reclaims energy saving device, it is characterized in that: comprise the cryogenic globe valve (2) be arranged on LNG storage tank (1) floss hole pipeline, on the pipeline of cryogenic globe valve (2) rear end, interference is connected with stop valve flange (3); Two pipelines are drawn by stop valve flange (3), a pipeline is wherein connected to user's pipe network (8) through vaporizer (6) and pressure governor (7) successively, the manual ball valve be promptly vented when another pipeline is provided with for controlling LNG storage tank overpressure (4).
2. LNG gas according to claim 1 reclaims energy saving device, it is characterized in that: described stop valve flange (3) is dismantled after handwheel for stop valve, to dismantle upper half part flange that nut and valve rod stay from middle flange connections, and the former pipeline of the size of described valve rod and cryogenic globe valve (2) rear end is measure-alike.
3. LNG gas according to claim 1 reclaims energy saving device, it is characterized in that: two pipelines that described stop valve flange (3) is drawn are mutually vertical, and manual ball valve (4) is arranged on immediately below stop valve flange (3).
4. LNG gas according to claim 1 reclaims energy saving device, it is characterized in that: the Flange Ball Valves (5) being provided with Non-follow control LNG flow rate of liquid between described stop valve flange (3) and vaporizer (6).
5. the LNG gas according to claim 1 or 4 reclaims energy saving device, it is characterized in that: be provided with the knock out drum (9) carrying out voltage stabilizing for natural gas-storing between described vaporizer (6) and pressure governor (7).
6. LNG gas according to claim 5 reclaims energy saving device, it is characterized in that: described Flange Ball Valves (5), vaporizer (6), knock out drum (9), pressure governor (7) and user's pipe network (8) are connected by snakelike carbon steel tube prefabricated in advance between any two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420579837.1U CN204268067U (en) | 2014-09-30 | 2014-09-30 | A kind of LNG gas reclaims energy saving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420579837.1U CN204268067U (en) | 2014-09-30 | 2014-09-30 | A kind of LNG gas reclaims energy saving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204268067U true CN204268067U (en) | 2015-04-15 |
Family
ID=52802933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420579837.1U Active CN204268067U (en) | 2014-09-30 | 2014-09-30 | A kind of LNG gas reclaims energy saving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204268067U (en) |
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2014
- 2014-09-30 CN CN201420579837.1U patent/CN204268067U/en active Active
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