CN103822091A - Natural gas recycling method for compressed natural gas stations - Google Patents
Natural gas recycling method for compressed natural gas stations Download PDFInfo
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- CN103822091A CN103822091A CN201310492965.2A CN201310492965A CN103822091A CN 103822091 A CN103822091 A CN 103822091A CN 201310492965 A CN201310492965 A CN 201310492965A CN 103822091 A CN103822091 A CN 103822091A
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Abstract
The invention relates to a natural gas recycling method for compressed natural gas stations, and mainly solves the problems that in the prior art, natural gas is wasted and environmental pollution is caused. The natural gas recycling method well solves the problems by adopting the technical scheme that natural gas from a recycling pipeline is divided into at least two paths after passing through a gas collecting main pipe, one path is emptied through an emptying pipeline, the other path enters a buffer tank, the natural gas from the buffer tank is fed into a compressor, and when the pressure of the recycling pipeline is reduced to be consistent with that of a gas pipeline in front of the compressor, a control valve of the emptying pipeline is opened to empty the natural gas. The method can be applied to compressed natural gas stations.
Description
Technical field
The present invention relates to a kind of CNG Filling Station rock gas recoverying and utilizing method.
Technical background
In current CNG Filling Station, adding after gas to automobile gas cylinder, in the pipeline between rifle head and the control valve of air filling gun, also has the remaining rock gas that about 1-2 power of boosting is 20MPa.For fear of causing danger, conventionally by this section of gas emptying to atmosphere, take off air filling gun, aerating process is just calculated end.Rock gas, as a kind of hazardous chemical, has inflammable and explosive feature, and discharge, easily in field, gas station station inner accumulated, forms major safety risks repeatedly.Rock gas, as a kind of non-renewable energy, directly discharges atmosphere and has caused the serious wasting of resources, and in addition, methane is as a kind of greenhouse gases, and its discharge also damages the ozone layer, befouling environment.
Aspect economic benefit, although each discharge amount is little, because the filling frequency of rock gas is very high, therefore residual gas still has the value of recycling.Calculating shows, length is about the air filling gun rifle head that 400mm, internal diameter 8mm, pressure are 20MPa, and the rock gas volume of its storage is about 6 liters under standard state, for a standard natural gas filling station, calculate by 1200 automobiles of aerating every day, the rock gas being discharged in atmosphere is about 2600m
3/ year, total amount is more considerable.Press 4.5 yuan/m of natural gas used for automobile price
3calculate, if can reclaim 80%, can increase every year nearly ten thousand yuan of benefits.
Based on more than, development of natural gas reclaiming system, not only can reduce potential safety hazard and reduce environmental pollution can also produce certain economic benefit.
Along with the raising of Environmental Protection in China requirement and being on the increase of CNG Filling Station, be a kind of inevitable trend by directly reclaiming discharged to the rock gas of atmosphere.
CN101975336A has proposed the rock gas of recovery to access fluid-tight isolation caisson or a unidirectional separation valve door by gas gathering manifold, then rock gas is sent in mesolow gas holder or pipeline network of fuel gas in city in, the ducted method of low-pressure fuel gas, this reclaiming system has adopted the fluid-tight isolation caisson of complicated structure, operation maintenance trouble, invest greatlyr, complicated design has increased the potential safety hazard in natural gas station in addition.
Summary of the invention
Technical problem to be solved by this invention is the problem of rock gas waste, befouling environment in prior art, and a kind of new CNG Filling Station rock gas recoverying and utilizing method is provided.The method, for CNG Filling Station, has advantages of that rock gas makes full use of, greatly reduces the pollution to environment.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of CNG Filling Station rock gas recoverying and utilizing method, the natural gas via gas gathering manifold coming from recovery line, be divided at least two-way, one tunnel is through blow-down pipe emptying, another road enters knock out drum, enters compressor from knock out drum rock gas out; When recovery line pressure decreased is when consistent with gas line pressure before compressor, blow-down pipe control valve is opened, rock gas emptying.
In technique scheme, preferably, the operational condition of described knock out drum: temperature is normal temperature to 90 ℃, and pressure is counted normal pressure to 25MPa with gauge pressure.
In technique scheme, preferably, described knock out drum top is provided with safety valve.
In technique scheme, preferably, between described gas gathering manifold and knock out drum, be provided with one-way valve.
In technique scheme, preferably, the described rock gas that enters compressor or come from gas gathering manifold from natural gas via excess pressure regulator out of knock out drum regulates regulates through pressure regulator entering knock out drum.
In technique scheme, preferably, described knock out drum can utilize the existing knock out drum before compressed natural gas filling mother station and standard station inner compressor.
In technique scheme, preferably, after can mixing with the rock gas that gas station internal pressure-regulating metering system or desulphurization system are come the described natural gas via excess pressure regulator coming from gas gathering manifold regulates, enter knock out drum.
The present invention is by the method for knock out drum before air filling gun being added to residual gas after gas and carrying out centralized recovery and be incorporated to existing gas station compressor; effectively reclaim the rock gas of emptying originally; both avoided the wasting of resources; reduce potential safety hazard; protect again environmental pollution; and can create certain economic benefit, obtain good technique effect.
Accompanying drawing explanation
Fig. 1 is one of schematic flow sheet of the method for the invention.
In Fig. 1,1 is gas gathering manifold, and 2 is blowdown piping, and 3 is control valve, and 4 is unidirectional separation valve door, and 5 is safety valve, and 6 is knock out drum, and 7 is pressure regulator valve, and 8 for removing the gas line of compressor.
Fig. 2 be the method for the invention schematic flow sheet two.
In Fig. 2,1 is gas gathering manifold, and 2 is blowdown piping, and 3 is control valve, and 4 is unidirectional separation valve door, and 5 is gas station internal pressure-regulating metering system or desulphurization system, and 6 is knock out drum, and 7 is pressure regulator valve, and 8 for removing the gas line of compressor.
Below by embodiment, the invention will be further elaborated, but be not limited only to the present embodiment.
Embodiment
[embodiment 1]
Fig. 1 is one of schematic flow sheet of the method for the invention, import gas gathering manifold 1 from the gas that comes of air filling gun blow-down pipe, now, control valve 3 on blowdown piping 2 is closed, the unidirectional separation valve door 4 of natural gas via reclaiming enters after knock out drum 6 bufferings, enters natural gas compressor through pressure regulator 7 by unidirectional separation valve door.Knock out drum 6 operational conditions are: temperature is normal temperature, and pressure is counted normal pressure with gauge pressure.When recovery line pressure decreased is when consistent with gas line pressure before compressor, control valve 3 is opened, and residual gas emptying completes callback course one time.
[embodiment 2]
According to condition and step described in embodiment 1, import gas gathering manifold 1 from the gas that comes of air filling gun blow-down pipe, now, control valve 3 on blowdown piping 2 is closed, the unidirectional separation valve door 4 of natural gas via reclaiming enters after knock out drum 6 bufferings, enters natural gas compressor through pressure regulator 7 by unidirectional separation valve door.Knock out drum 6 operational conditions are: temperature is 90 ℃, and pressure is counted 25MPa with gauge pressure.When recovery line pressure decreased is when consistent with gas line pressure before compressor, control valve 3 is opened, and residual gas emptying completes callback course one time.
[embodiment 3]
Fig. 2 be the method for the invention schematic flow sheet two, import gas gathering manifold 1 from the gas that comes of air filling gun blow-down pipe, now, control valve 3 on blowdown piping 2 is closed, the unidirectional separation valve door 4 of natural gas via reclaiming, after knock out drum before pressure regulator 7 enters compressor 6 buffering, enters compressor together with the rock gas of coming with pressure regulation metering system or desulphurization system 5.Knock out drum 6 operational conditions are: temperature is 50 ℃, and pressure is counted 10MPa with gauge pressure.When recovery line pressure decreased is when consistent with gas line pressure before compressor, control valve 3 is opened, and residual gas emptying completes callback course one time.
Claims (7)
1. a CNG Filling Station rock gas recoverying and utilizing method, is divided at least two-way the natural gas via gas gathering manifold coming from recovery line, and a road is through blow-down pipe emptying, and another road enters knock out drum, enters compressor from knock out drum rock gas out; When recovery line pressure decreased is when consistent with gas line pressure before compressor, blow-down pipe control valve is opened, rock gas emptying.
2. CNG Filling Station rock gas recoverying and utilizing method according to claim 1, is characterized in that the operational condition of described knock out drum: temperature is normal temperature to 90 ℃, and pressure is counted normal pressure to 25MPa with gauge pressure.
3. CNG Filling Station rock gas recoverying and utilizing method according to claim 1, is characterized in that described knock out drum top is provided with safety valve.
4. CNG Filling Station rock gas recoverying and utilizing method according to claim 1, is characterized in that being provided with one-way valve between described gas gathering manifold and knock out drum.
5. CNG Filling Station rock gas recoverying and utilizing method according to claim 1, is characterized in that the described rock gas that enters compressor or come from gas gathering manifold from knock out drum natural gas via excess pressure regulator out regulates regulates through pressure regulator entering knock out drum.
6. CNG Filling Station rock gas recoverying and utilizing method according to claim 1, is characterized in that described knock out drum can utilize the existing knock out drum before compressed natural gas filling mother station and standard station inner compressor.
7. CNG Filling Station rock gas recoverying and utilizing method according to claim 1, enters knock out drum after it is characterized in that can mixing with the rock gas that gas station internal pressure-regulating metering system or desulphurization system are come the described natural gas via excess pressure regulator coming from gas gathering manifold regulates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310492965.2A CN103822091A (en) | 2013-10-18 | 2013-10-18 | Natural gas recycling method for compressed natural gas stations |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310492965.2A CN103822091A (en) | 2013-10-18 | 2013-10-18 | Natural gas recycling method for compressed natural gas stations |
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| CN103822091A true CN103822091A (en) | 2014-05-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270121A (en) * | 2017-06-06 | 2017-10-20 | 大唐贵州发耳发电有限公司 | A kind of hydric safe gas exhaust piping device |
| US10578249B2 (en) | 2015-12-14 | 2020-03-03 | Volvo Truck Corporation | Gas tank arrangement |
| CN111042773A (en) * | 2019-12-21 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Low-pressure coal bed gas well emptying and recycling linkage device |
| CN112524481A (en) * | 2021-02-07 | 2021-03-19 | 河南氢枫能源技术有限公司 | System for recovering vent gas of hydrogenation station |
| CN113048399A (en) * | 2021-03-17 | 2021-06-29 | 四川京川大正油田技术服务有限责任公司 | Method for recovering residual natural gas in machine cavity and pipeline after compressor shutdown |
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| CN101975336A (en) * | 2010-11-16 | 2011-02-16 | 罗东晓 | Valve, system and method for evacuating gas in gas filling hose used for recycling high pressure gas |
| CN202252840U (en) * | 2011-10-26 | 2012-05-30 | 山东省特种设备检验研究院滨州分院 | Recycling and replacing device for automotive natural gas bottle |
| CN102913756A (en) * | 2012-10-25 | 2013-02-06 | 泉州市燃气有限公司 | Residual gas recovery system of gas station compressor |
| CN203131417U (en) * | 2013-03-12 | 2013-08-14 | 北京普发兴业动力科技发展有限责任公司 | Skid-mounted type self-powered LNG (liquefied natural gas) filling station with BOG (boiled off gas) recovery function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070193648A1 (en) * | 2003-10-10 | 2007-08-23 | Grantham Rodger P | Vapor recovery system with improved orvr compatibility and performance |
| CN101975336A (en) * | 2010-11-16 | 2011-02-16 | 罗东晓 | Valve, system and method for evacuating gas in gas filling hose used for recycling high pressure gas |
| CN202252840U (en) * | 2011-10-26 | 2012-05-30 | 山东省特种设备检验研究院滨州分院 | Recycling and replacing device for automotive natural gas bottle |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10578249B2 (en) | 2015-12-14 | 2020-03-03 | Volvo Truck Corporation | Gas tank arrangement |
| CN107270121A (en) * | 2017-06-06 | 2017-10-20 | 大唐贵州发耳发电有限公司 | A kind of hydric safe gas exhaust piping device |
| CN111042773A (en) * | 2019-12-21 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Low-pressure coal bed gas well emptying and recycling linkage device |
| CN111042773B (en) * | 2019-12-21 | 2021-11-12 | 山西晋城无烟煤矿业集团有限责任公司 | Low-pressure coal bed gas well emptying and recycling linkage device |
| CN112524481A (en) * | 2021-02-07 | 2021-03-19 | 河南氢枫能源技术有限公司 | System for recovering vent gas of hydrogenation station |
| CN112524481B (en) * | 2021-02-07 | 2021-06-01 | 河南氢枫能源技术有限公司 | System for recovering vent gas of hydrogenation station |
| CN113048399A (en) * | 2021-03-17 | 2021-06-29 | 四川京川大正油田技术服务有限责任公司 | Method for recovering residual natural gas in machine cavity and pipeline after compressor shutdown |
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Application publication date: 20140528 |