CN105202363A - Device for recovering liquid residue and gas residue in liquid natural gas transport vehicle tank - Google Patents
Device for recovering liquid residue and gas residue in liquid natural gas transport vehicle tank Download PDFInfo
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- CN105202363A CN105202363A CN201310325813.3A CN201310325813A CN105202363A CN 105202363 A CN105202363 A CN 105202363A CN 201310325813 A CN201310325813 A CN 201310325813A CN 105202363 A CN105202363 A CN 105202363A
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Abstract
The invention discloses a device for recovering liquid residue and gas residue in a liquid natural gas transport vehicle tank. The device comprises an exchanger, a tank and a compressor and is characterized in that liquid residue and gas residue enter into the exchanger and the tank by unloading pipes, then are subjected to pressurization by a compressor and then are fed into the next process so that liquid residue and gas residue recovery is finished. Natural gas in the buffer tank is used as a natural gas power source, a natural gas engine or a generator drives the compressor to work, local materials and waste are used, an external power supply is avoided, power capacity increasing and consumption are reduced and an operation cost is very low. The device realizes good energy integrated utilization, liquid residue and gas residue recovery and no pollution and influence on the environment. The device prevents pollution caused by liquid residue and gas residue discharge from a transport vehicle tank into air and realizes considerable economic income.
Description
Technical field
In a kind of liquified natural gas carrier vehicle tank that the present invention relates to, the recovering device of residual solution residual gas, belongs to energy source use field.
Background technique
Existing liquified natural gas is (also known as LNG, also comprise liquid coal-seam gas herein, liquid shale gas etc.) transport vehicle, fortune spokeless wheel car arrives client unit, the residual liquid of about 15% to be left in principle in tank when unloading, with keep transport vehicle return way in again fill time tank in for low-temperature condition, leaving residual liquid is exactly the tank prevented on transport vehicle, become " hot tank " by " cold tank ", what be unfavorable for tank fills or produces when filling a large amount of BOG (vaporized gaseous natural gas) again, the result done like this, cause fortune spokeless wheel car when LNG receiving station or factory fill LNG again, be the residual air of 0.1-0.6MPa owing to there being overbottom pressure in fortune spokeless wheel car tank, occupy the upper space in carrier vehicle tank, LNG is difficult to fill completely, simultaneously remaining liquid is " hydrothermal solution ", when running into the cold liquid of new LNG, can produce layering " rolling " phenomenon, selects the withstand voltage unfavorable of tank on car to fortune.
In closer year, a lot of people wants to extract the remaining liquid residual air in fortune spokeless wheel car tank, all runs into the difficult problem that LNG is low temperature, does not have cryogenic gas compressor on the market, more do not take out the compressor of cryogenic liquide.Up to now, have no idea to reclaim liquid residual air remaining in LNG carrier vehicle tank at all.
At present, the remaining liquid residual air in all LNG carrier vehicle tanks, before filling, be all the way adopting emptying, cause very large pollution to environment, the collapsing force of LNG to atmospheric ozone layer is 34 times of carbon dioxide; Meanwhile, extraordinary clean energy resource is wasted.According to statistics, national Ge great LNG fueling station, the LNG of annual waste ten million side, this needs the attention causing us.The thought needing us to have to take care of the pence, is recycled the LNG of discharge.
Summary of the invention
To liquid residual air more than in carrier vehicle tank, the device first invented will possess the problem that the two states i.e. rock gas that is liquid and gaseous state that exists LNG can process simultaneously; Its secondary solution be the problem of LNG low temperature, namely temperature is at subzero 163 degree; What finally will solve is economy problems, and equipment wants simple, efficiently, and not power consumption substantially.
Remaining liquid residual air in fortune spokeless wheel car tank, seldom, Economy is little for amount, if equipment is huge, valuable, power consumption is large, is difficult to recoup capital outlay, does not obviously have investment value, do not have practicability.This just requires that our technological process is simple, above-mentioned three problems of the solution coordinated very much.
Technological scheme:
Remaining liquid residual gas recycling device in liquified natural gas carrier vehicle tank, be made up of exchanger (5), tank (6), compressor (7), its technical characteristics is: remaining liquid residual air enters after exchanger, tank through pipeline of unloading and gives later process by compressor pressurizes spokeless wheel, completes the recovery to remaining liquid residual air.
Its technical characteristics of exchanger is: exchanger is also known as energy or heat exchanger, comprise air temperature type vaporizer (with air exchange heat), water bath type vaporizer (with water coke slurry heat), comprises the exchanger with the exchange heat of other medium in addition.
The technical characteristics of tank is: refer to the knock out drum that certain space can be withstand voltage.
The technical characteristics of compressor is: the compressor generally referring to compressed natural gas.Its power resources can be the motors of three-phase electrical source of power, can be that natural gas power unit is powered, and also can be the motors of rock gas.Apparatus of the present invention preferentially adopt natural gas engine, namely utilize the rock gas of recovery to save energy the burden increased.This is unique distinction of the present invention, and concrete grammar on knock out drum, punches extraction gas pipeline again to natural gas engine or generator set air feed.Omit in figure and do not draw, keep simplified form.
Remaining liquid residual air enters its technical characteristics of exchanger through pipeline of unloading and is: first its Manifold technology feature of unloading is: refer to unload gas phase pipeline or the liquid phase pipeline that dock with tank on transport vehicle; In Fig. 1, comprise the gas phase pipeline of unloading of the LNG fortune spokeless wheel car tank that 1 is Flange joint; 10 be Flange joint the liquid phase pipelines of unloading of LNG carrier vehicle tank; These two kinds pipelines of unloading adopt as the Placement in Fig. 1, by the switching of valve 2,3,4, realize unloading to the circularly-supercharged of tank on fortune spokeless wheel car, after guaranteeing that remaining liquid, residual air can enter exchanger heat-shift successively, enter knock out drum 6.Namely, remaining liquid residual air all just can will enter in knock out drum 6 through exchanger, solves Low Temperature Problems.
10 be the LNG carrier vehicle tank of Flange joint liquid phase pipeline of unloading on sensor be housed (do not draw in figure, maintenance picture is succinct), to unload the temperature and pressure of the fluid in liquid phase pipeline, when confirming that the LNG pressure in liquid phase pipeline is too low, the unlatching of regulating valve, supercharging again, until remaining liquid is unsnatched.Do like this and solve circularly-supercharged problem, guarantee that remaining liquid is unsnatched.
It is not simple connection that remaining liquid residual air enters exchanger through pipeline of unloading, but will through a performing creative labour, namely several loop is formed by the switching of valve, reach three functions, one is: loop can supercharging to the tank on transport vehicle, guarantee normally to unload fast remaining liquid in tank, exchanger plays the object of supercharging; Two are: heat exchange is carried out to liquid more than the tank on transport vehicle in loop; Three are: the residual air of loop to the tank on fortune spokeless wheel car carries out heat exchange; The present invention includes remaining liquid residual air in enter within the scope of the rights protection of exchanger through pipeline of unloading realizing pipeline of unloading that above-mentioned three functions are formed.Namely remaining liquid residual air enters through pipeline of unloading the interest field that exchanger comprises above-mentioned three functions.
Remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to later process by compressor pressurizes, its technical characteristics is the rock gas that namely compressor operating sucks in knock out drum, pressurized delivered is to later process, and its technical characteristics of later process can be (flowing to) storage tank; Later process can also refer to that again pressurized delivered is to another tank, and multistage pressurization repeats to be transported to and finally flows to later process; (flowing to) can be resident's pipe network, also can be the gas cylinder in (flowing to) long tube gas cylinder trailer, or in the gas cylinder in (flowing to) gas combustion automobile.Pressurized delivered, to later process, could complete the recovery to remaining liquid residual air at last.
Remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to later process by compressor pressurizes, also comprise remaining liquid residual air to enter exchanger through pipeline of unloading and enter multiple tank arranged side by side, or remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to follow-up multiple tank by compressor pressurizes, each tank is as above, all through compressor pressurizes, finally enter later process.These are all flowed in the scope of patent protection of later process by compressor pressurizes after pipeline of unloading enters exchanger, tank in remaining liquid residual air.
Remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to later process by compressor pressurizes, its technical characteristics is the rock gas that namely compressor operating sucks in knock out drum, knock out drum pressure is reduced, pressure difference is produced between in tank on this knock out drum and transport vehicle, there is pressure difference, thus to have made on transport vehicle remaining liquid residual air in tank enter after exchanger, tank through pipeline of unloading continually to flow to later process by compressor pressurizes.
Compressor work could produce pressure difference, there is pressure difference, the rock gas entered through exchanger heating is just able to continuously in knock out drum, in FIG, 9 represent: compressor work and gas engine produce a large amount of heat, air can be passed through, the exchanger of water or other medium and this case produces exchange heat, make full use of LNG cold energy, make equipment simply efficient.This is the 4th function of exchanger.Also be an option.
Adopt gas engine, utilize LNG cold energy to be this case technical characterstic, it can make the cost recovery of remaining liquid residual air greatly reduce.Extraordinaryly solve the 3rd problem.
Beneficial effect
1, exchanger plays four effects, to carrier vehicle tank supercharging, with remaining liquid, residual air heat, and compressor, motor heat exchange, wherein by medium (as water) and remaining liquid, residual air heat-shift, the heat of its medium origin of heat compressor, gas engine.This is an extraordinary using energy source, and exchanger function is played greatly, and utilization efficiency is high.
2, exchanger (5), tank (6), compressor (7) are conventional products on the market, and easy to maintenance, easily, cost is low in buying.The extraordinary solution Low Temperature Problems of such technological process, equipment is simple, and cost is low, invests little.
3, remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to later process by compressor pressurizes, and more than the last period, liquid residual air enters after exchanger, tank through pipeline of unloading, and this section, by exchanger supercharging, makes there is residual air in tank, not consumption of power; Latter one section flows to later process by compressor pressurizes, this section is owing to having rock gas in tank, gas engine is started working, drive compressor operating, suck the rock gas in knock out drum, tank internal pressure starts to reduce, and makes more than the last period that liquid residual air enters exchanger through pipeline of unloading, this section of tank can be carried out continuously.Thus whole technological process is carried out continuously.
4, the present invention adopts the rock gas in knock out drum to do power resources, natural gas engine or generator is adopted to drive compressor operating, to gather materials on the spot waste utilization, without the need to external connection power power supply, save electric power increase-volume and consumption, operating cost of the present invention is very low, and this is an important feature of this project economics.
5, the heat that produces of the cold energy of LNG and compressor, gas engine, carries out the exchange of heat by medium air, water or other medium.Namely produce power by residual air, the heat that acting produces is supplied to again the heat that LNG vaporization needs.This is extraordinary using energy source.
6, this device is an extraordinary comprehensive utilization of energy example, to the recovery of remaining liquid residual air, on environment without any pollution and impact.To stop on transport vehicle remaining liquid residual air in tank and sky discharge to the pollution caused, simultaneously a considerable income in addition.
Accompanying drawing explanation
In Fig. 1:
1, the gas phase pipeline of unloading of the LNG carrier vehicle tank of Flange joint is expressed as; 2,3,4,8 represent valve; 5 represent exchanger; 6 represent tank; 7, compressor is represented; Media for heat exchange exemplary flow is carried out between 9 expression exchangers and compressor; 10, the liquid phase pipeline of unloading of the LNG carrier vehicle tank of Flange joint is expressed as.
Embodiment
In Fig. 1:
1, the gas phase pipeline of unloading of the LNG carrier vehicle tank of Flange joint is expressed as; 2,3,4,8 represent valve; 5 represent exchanger; 6 represent tank; 7, compressor is represented; A matter heat exchange exemplary flow is carried out between 9 expression exchangers and compressor; 10, the liquid phase pipeline of unloading of the LNG carrier vehicle tank of Flange joint is expressed as.
On natural gas transportation car, the liquid-phase tube of tank meets 10 places, and gas phase pipe meets 1 place;
First valve 2,4 cuts out, and valve 3 is opened, and pressurizes, first unload the tank on transport vehicle, the liquid phase LNG in the tank on transport vehicle;
Cut-off valve 3, opening valve 4, LNG through 10 is enter knock out drum 6, when knock out drum internal pressure reaches certain setting value after the liquid phase pipeline of the LNG carrier vehicle tank of Flange joint flows into exchanger 5 and Medium Exchange heat, open compressor 7, open valve 8 after compression and flow to later process.
10 be the LNG carrier vehicle tank of Flange joint liquid phase pipeline on temperature transducer is housed, recording temperature is LNG fluid temperature, when knock out drum pressure drops to certain value, repeats above-mentioned action.
When recording the non-LNG fluid temperature of temperature, open valve 2, cut-off valve 3, at this moment residual air in carrier vehicle tank is reclaimed, namely residual air is the gas phase pipeline of the LNG carrier vehicle tank of Flange joint through 1, and 10 is that the liquid phase pipeline of the LNG carrier vehicle tank of Flange joint enters exchanger 5 simultaneously, then enters knock out drum 6, through opening compressor 7, later process is given to by the valve 8 of residual air after compression through opening.
Option, in the heat that compressor 6 produces and exchanger 5, LNG cold energy produces and exchanges, and its circulation loop is as shown in 9 in Fig. 1.
Claims (2)
1. remaining liquid residual gas recycling device in liquified natural gas carrier vehicle tank, be made up of exchanger, tank, compressor, in its technical characteristics: remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to later process by compressor pressurizes, completes the recovery to remaining liquid residual air.
2. set up the method for remaining liquid residual gas recycling device in liquified natural gas carrier vehicle tank for one kind, be made up of exchanger, tank, compressor, its technical characteristics is: remaining liquid residual air enters after exchanger, tank through pipeline of unloading and flows to later process by compressor pressurizes, completes the recovery to remaining liquid residual air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310325813.3A CN105202363A (en) | 2013-07-24 | 2013-07-24 | Device for recovering liquid residue and gas residue in liquid natural gas transport vehicle tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310325813.3A CN105202363A (en) | 2013-07-24 | 2013-07-24 | Device for recovering liquid residue and gas residue in liquid natural gas transport vehicle tank |
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| CN105202363A true CN105202363A (en) | 2015-12-30 |
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| CN201310325813.3A Pending CN105202363A (en) | 2013-07-24 | 2013-07-24 | Device for recovering liquid residue and gas residue in liquid natural gas transport vehicle tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664653A (en) * | 2020-06-17 | 2020-09-15 | 大庆市中瑞燃气有限公司 | BOG cold volume and methane recycle device |
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| CN2735144Y (en) * | 2003-03-28 | 2005-10-19 | 胡滨 | Device for recovering residual air of compressed natural gas storage steel cylinder |
| US20060042273A1 (en) * | 2004-08-26 | 2006-03-02 | Seaone Maritime Corp. | Storage of natural gas in liquid solvents and methods to absorb and segregate natural gas into and out of liquid solvents |
| CN201110459Y (en) * | 2007-09-30 | 2008-09-03 | 北京首科中原清洁燃料技术发展有限责任公司 | Liquefied natural gas vehicle air feed system |
| CN102261560A (en) * | 2011-06-29 | 2011-11-30 | 中国寰球工程公司 | Boil-off gas zero emission system and method |
| CN102425725A (en) * | 2011-12-05 | 2012-04-25 | 四川金星压缩机制造有限公司 | System and method for reclaiming boil off gas (BOG) in liquefied natural gas (LNG) storage tank |
| CN202561436U (en) * | 2012-02-20 | 2012-11-28 | 河南中原绿能高科有限责任公司 | Liquefied natural gas station flashed vapor recovery device |
| CN202756905U (en) * | 2012-08-01 | 2013-02-27 | 徐州金宏二氧化碳科技开发有限公司 | Evaporated-gas recovery device for carbon dioxide storage tank |
| CN103062620A (en) * | 2013-01-24 | 2013-04-24 | 成都深冷液化设备股份有限公司 | Low-temperature BOG gas cold energy recovery device and process |
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2013
- 2013-07-24 CN CN201310325813.3A patent/CN105202363A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2735144Y (en) * | 2003-03-28 | 2005-10-19 | 胡滨 | Device for recovering residual air of compressed natural gas storage steel cylinder |
| US20060042273A1 (en) * | 2004-08-26 | 2006-03-02 | Seaone Maritime Corp. | Storage of natural gas in liquid solvents and methods to absorb and segregate natural gas into and out of liquid solvents |
| CN201110459Y (en) * | 2007-09-30 | 2008-09-03 | 北京首科中原清洁燃料技术发展有限责任公司 | Liquefied natural gas vehicle air feed system |
| CN102261560A (en) * | 2011-06-29 | 2011-11-30 | 中国寰球工程公司 | Boil-off gas zero emission system and method |
| CN102425725A (en) * | 2011-12-05 | 2012-04-25 | 四川金星压缩机制造有限公司 | System and method for reclaiming boil off gas (BOG) in liquefied natural gas (LNG) storage tank |
| CN202561436U (en) * | 2012-02-20 | 2012-11-28 | 河南中原绿能高科有限责任公司 | Liquefied natural gas station flashed vapor recovery device |
| CN202756905U (en) * | 2012-08-01 | 2013-02-27 | 徐州金宏二氧化碳科技开发有限公司 | Evaporated-gas recovery device for carbon dioxide storage tank |
| CN103062620A (en) * | 2013-01-24 | 2013-04-24 | 成都深冷液化设备股份有限公司 | Low-temperature BOG gas cold energy recovery device and process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111664653A (en) * | 2020-06-17 | 2020-09-15 | 大庆市中瑞燃气有限公司 | BOG cold volume and methane recycle device |
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Application publication date: 20151230 |
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