CN105135208A - Compression recycling method for evaporation gas of liquefied natural gas - Google Patents
Compression recycling method for evaporation gas of liquefied natural gas Download PDFInfo
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- CN105135208A CN105135208A CN201510514869.2A CN201510514869A CN105135208A CN 105135208 A CN105135208 A CN 105135208A CN 201510514869 A CN201510514869 A CN 201510514869A CN 105135208 A CN105135208 A CN 105135208A
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Abstract
The invention relates to the technical field of liquefied natural gas, in particular to a compression recycling method for evaporation gas of liquefied natural gas. The method comprises the following steps that S1, after heat is absorbed by a liquefied natural gas storage tank, the liquefied natural gas in the liquefied natural gas storage tank partially evaporates into the evaporation gas; S2, after pressure in the liquefied natural gas storage tank rises, the evaporation gas flows out of a gas phase outlet of the liquefied natural gas storage tank; S3, after the evaporation gas flowing out in S2 is heated and pressurized, the evaporation gas is stored in an evaporation gas recycling tank; S4, after pressure of the evaporation gas in the evaporation gas recycling tank is lowered, the evaporation gas is fed into a liquefied natural gas tank car, and pressure in the liquefied natural gas tank car is increased; and S5, liquefied natural gas in the liquefied natural gas tank car is pressed out by high pressure to enter the liquefied natural gas storage tank. According to the compression recycling method for the evaporation gas of the liquefied natural gas, the problem of release of the evaporation gas in the liquefied natural gas storage tank is solved, and the amount of the evaporation gas generated by unloading and pressurization is lowered through evaporation gas unloading.
Description
Technical field
The present invention relates to LNG Technology field, particularly relate to a kind of pressure recovery Application way of boil-off gas, relate more specifically to a kind of pressure recovery Application way of boil-off gas of LNG Liquefied natural gas.
Background technique
LNG Liquefied natural gas (English: LiquefiedNaturalGas, abbreviation: LNG) be the high-grade energy that a kind of calorific value is high, combustion pollution is little.LNG gas station is the filling station of supply LNG, during LNG gas station endogenous supply LNG, boil-off gas (English: BoilOffGas, abbreviation: BOG) can be produced, if directly discharged this part BOG gas, the waste of environmental pollution and the energy can be caused.Therefore, need the BOG gas produced in LNG gas station to recycle.
Prior art usually by after the BOG gas collection that produces in LNG gas station, after a series of processing system, is incorporated to city natural gas pipe network or is delivered to gas user.But this method limits by external factor, such as, must there is pipeline network of fuel gas in city near gas station or have other gas users.
In addition, in prior art, in LNG gas station, liquefaction system again can be set, thus reclaim BOG gas.But this way of recycling needs to increase the equipment such as compressor, air cooling device, heat exchanger, cause that the equipment investment in the method is high, floor space large, later maintenance and running cost higher, and the technique of method is more complicated.
And, BOG gas is recovered to compressed natural gas, and (English: CompressedNaturalGas, abbreviation: CNG) gas storage facility, is only applicable to the situation that L-CNG gas station and LNG/L-CNG build station jointly, wherein, L-CNG gas station is specially for gas-fueled vehicles fill the station of CNG.After BOG gas collects in knock out drum in this station, be warming up to close to ambient temperature through air-heating type gasifier, be then stored in gas well (bottle group) by boosting to 20MPa after BOG gas high pressure compressor, sell with CNG product.The CNG using scope that the method reclaims is restricted, and for standard LNG gas station, interpolation is then needed to comprise BOG knock out drum, BOG high pressure compressor, with some array apparatus such as CNG bomb groups, cause equipment lengthy and jumbled, floor space is larger, pipeline is too complicated, needs to arrange more staff to carry out operation and maintenance in station.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention there is provided a kind of pressure recovery Application way of natural gas vaporization gas, solves the problem of releasing of boil-off gas in liquefied natural gas (LNG) tank.
(2) technological scheme
In order to solve the problems of the technologies described above, the invention provides a kind of pressure recovery Application way of LNG Liquefied natural gas gas boil-off gas, comprising the steps:
After the heat absorption of S1, described liquefied natural gas (LNG) tank, the liquefied natural gas partial in described liquefied natural gas (LNG) tank is evaporated to boil-off gas, for described liquefied natural gas (LNG) tank is pressurizeed;
After the boil-off gas pressure produced in S2, described liquefied natural gas (LNG) tank raises, boil-off gas flows out from the gaseous phase outlet of described liquefied natural gas (LNG) tank;
The described boil-off gas flowed out in S3, described step S2, after intensification pressurization, is stored in boil-off gas recycling can;
LNG Liquefied natural gas tank car is sent into, for pressurizeing in described LNG Liquefied natural gas tank car after boil-off gas step-down in S4, described boil-off gas recycling can;
LNG Liquefied natural gas in S5, described LNG Liquefied natural gas tank car is pressed out in described liquefied natural gas (LNG) tank by high pressure.
Further, in step S5, after LNG Liquefied natural gas in described LNG Liquefied natural gas tank car all extrudes, the boil-off gas in described LNG Liquefied natural gas tank car flows out from the gaseous phase outlet of described LNG Liquefied natural gas tank car and after the pressurization that heats up, is stored in boil-off gas recycling can.
Further, aforementioned evaporation gas carries out intensification pressurization by heat exchanger and compressor successively.
Further, the boil-off gas in described boil-off gas recycling can also can pass in described liquefied natural gas (LNG) tank, is its supplementary tank internal pressure.
Further, aforementioned liquefied natural gas storage tank is also connected with safe diffused gas vaporizer.
Further, aforementioned liquefied natural gas storage tank is also connected with filling machine.
(3) beneficial effect
Technique scheme of the present invention has following beneficial effect:
The pressure recovery Application way of natural gas vaporization gas provided by the invention, by the boil-off gas in boil-off gas recycling can is passed into LNG Liquefied natural gas tank car and liquefied natural gas (LNG) tank, what alternative current gas station used unload and the BOG circulation technology of voltage-regulating technique, simplify the technological process of gas station, reduce the complexity of station gut line, reduce investment and operation cost.
The pressure recovery Application way of natural gas vaporization gas provided by the invention, can recycle most of BOG gas, avoid the economic loss that emptying causes, save a large amount of operation cost.
The pressure recovery Application way of natural gas vaporization gas provided by the invention, mainly solves BOG in existing LNG gas station technique and to release restricted problem; Solve simultaneously from the mode of supercharging unload and LNG enter vaporizer pressure regulation produce the problem that a large amount of BOG can not carry out recycling; Also solve in prior art and utilize immersed pump to unload the problem of brought power consumption and flow process complexity.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of the pressure recovery Application way application of natural gas vaporization gas of the present invention.
Wherein, 1: liquefied natural gas (LNG) tank; 2: heat exchanger; 3: compressor; 4: boil-off gas recycling can; 5: LNG Liquefied natural gas tank car; 6: safe diffused gas vaporizer; 7: filling machine.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
In describing the invention, it should be noted that, except as otherwise noted, the implication of " multiple " is two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, also it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, visual concrete condition understands above-mentioned term concrete meaning in the present invention.
The pressure recovery Application way of a kind of natural gas vaporization gas described in the present embodiment, comprises the steps:
After the heat absorption of S1, liquefied natural gas (LNG) tank 1, the liquefied natural gas partial in liquefied natural gas (LNG) tank 1 is evaporated to boil-off gas, and liquefied natural gas (LNG) tank 1 pressure is raised;
When the boil-off gas pressure produced in S2, liquefied natural gas (LNG) tank 1 is higher than 1.0MPa, boil-off gas flows out from the gaseous phase outlet of liquefied natural gas (LNG) tank 1;
The boil-off gas flowed out in S3, step S2, after intensification pressurization, is stored in boil-off gas recycling can 4;
In S4, boil-off gas recycling can 4 boil-off gas step-down after send into LNG Liquefied natural gas tank car 5, be pressurization in LNG Liquefied natural gas tank car 5;
LNG Liquefied natural gas in S5, LNG Liquefied natural gas tank car 5 is pressed out in liquefied natural gas (LNG) tank 1 by high pressure.
Wherein, in step S5, after the LNG Liquefied natural gas in LNG Liquefied natural gas tank car 5 all extrudes, the boil-off gas in LNG Liquefied natural gas tank car 5 flows out from the gaseous phase outlet of LNG Liquefied natural gas tank car 5 and after the pressurization that heats up, is stored in boil-off gas recycling can 4.
In the present embodiment, boil-off gas carries out intensification pressurization by heat exchanger 2 and compressor 3 successively.Heat exchanger 2 is air type heater.
Wherein, when the pressure in liquefied natural gas (LNG) tank 1 is lower than 0.6MPa, the boil-off gas in boil-off gas recycling can 4 also can pass in liquefied natural gas (LNG) tank 1, is its supplementary tank internal pressure.
Wherein, liquefied natural gas (LNG) tank 1 is also connected with safe diffused gas vaporizer 6, wherein safe diffused gas vaporizer 6 is safety installations, during boil-off gas overpressure namely in liquefied natural gas (LNG) tank 1, uses for emergency discharge.Liquefied natural gas (LNG) tank 1 is also connected with filling machine 7, to be annotated LNG Liquefied natural gas to LNG Liquefied natural gas user by filling machine 7.
The Collection and utilization flow process that the pressure recovery Application way of the natural gas vaporization gas that the present embodiment provides is concrete is:
To send in LNG Liquefied natural gas tank car 5 after the high-pressure evaporation gas step-down in boil-off gas recycling can 4, increase the gaseous pressure of tank car, by the LNG Liquefied natural gas press-in liquefied natural gas (LNG) tank 1 in tank car, do not re-use immersed pump and unload from the mode of supercharging.After having unloaded, boil-off gas residual in LNG Liquefied natural gas tank car 5 returns in boil-off gas recycling can 4 after again heating up and pressurizeing, and reaches the effect recycled.
In liquefied natural gas (LNG) tank 1, boil-off gas accumulates gradually, tank internal pressure raises gradually, and when pressure reaches 1.0MPa, boil-off gas enters heat exchanger 2 from the gaseous phase outlet of liquefied natural gas (LNG) tank 1, enter compressor 3 after intensification, pressure is increased to and can be stored in boil-off gas recycling can 4.In the present embodiment, the boil-off gas in boil-off gas recycling can 4 can be utilized to return in liquefied natural gas (LNG) tank 1, help liquefied natural gas (LNG) tank 1 to carry out pressure regulation, avoid and utilize LNG to enter vaporizer gasification to produce the economic loss that this voltage regulating mode of boil-off gas brings.
The device that the method being illustrated in figure 1 the present embodiment is applied, comprise liquefied natural gas (LNG) tank 1, LNG Liquefied natural gas tank car 5 and boil-off gas recycling can 4, be connected with release pipeline and pressure regulation pipeline between liquefied natural gas (LNG) tank 1 and boil-off gas recycling can 4, pipeline of releasing be communicated with successively heat exchanger 2 and compressor 3.Be connected with air inlet pipeline between boil-off gas recycling can 4 and LNG Liquefied natural gas tank car 5, between LNG Liquefied natural gas tank car 5 and liquefied natural gas (LNG) tank 1, be connected with liquid phase pipeline; Boil-off gas in liquefied natural gas (LNG) tank 1 heats up after pressurization by pipeline of releasing, be stored in boil-off gas recycling can 4, boil-off gas is passed into liquefied natural gas (LNG) tank 1 by pressure regulation pipeline by boil-off gas recycling can 4, and be storage tank pressurization, and boil-off gas is passed into LNG Liquefied natural gas tank car 5 by air inlet pipeline by boil-off gas recycling can 4, and be tank car pressurization, the LNG Liquefied natural gas in LNG Liquefied natural gas tank car 5 enters liquefied natural gas (LNG) tank 1 by liquid phase pipeline.
Liquefied natural gas (LNG) tank 1 is also connected with safe diffused gas vaporizer 6, when pressure in liquefied natural gas (LNG) tank 1 more than 1.2MPa, BOG by emptying after safe diffused gas vaporizer 6.Liquefied natural gas (LNG) tank 1 is also connected with filling machine 7.
Also be connected with pressure relief pipe between LNG Liquefied natural gas tank car 5 and boil-off gas recycling can 4, the boil-off gas of LNG Liquefied natural gas tank car 5, by after pressure relief pipe intensification pressurization, is stored in boil-off gas recycling can 4, realizes recycling of boil-off gas.Pressure relief pipe is communicated with successively heat exchanger 2 and compressor 3.In the present embodiment, pipeline of releasing is connected same heat exchanger 2 respectively with pressure relief pipe and compressor 3, two bursts of boil-off gas together can carry out intensification pressurization by this heat exchanger 2 and compressor 3.Wherein, heat exchanger 2 is air temperature type heater, for heating up for boil-off gas.Compressor 3 is low pressure ratio piston compressor 3, for being boil-off gas pressurization.
Wherein, pressure regulation pipeline, liquid phase pipeline and air inlet pipeline are respectively equipped with control valve, between liquefied natural gas (LNG) tank 1 and natural gas gasifier 6, between liquefied natural gas (LNG) tank 1 and heat exchanger 2, between boil-off gas recycling can 4 and compressor 3, between LNG Liquefied natural gas tank car 5 and heat exchanger 2, are respectively equipped with control valve.
The equipment such as boil-off gas recycling can 4, low pressure ratio piston compressor 3 etc. and latent liquid type cryopump in normal station that this device adopts and air-heating type gasifier are compared with its cryogenic piping be connected, and price advantage is obvious; Owing to there is not the device of high-power power consumption in boil-off gas recycling can 4, low pressure ratio piston compressor 3 etc., also reduce running cost.
The method that the present embodiment provides applies the specific works flow process of this device, and as shown in Figure 1, dotted line is the flow duct of boil-off gas, and solid line is the flow line of LNG Liquefied natural gas, and direction shown in arrow is the flow direction of boil-off gas or LNG Liquefied natural gas.When the boil-off gas gas pressure gathered in liquefied natural gas (LNG) tank 1 is higher than 1.0MPa, control valve between liquefied natural gas (LNG) tank 1 and heat exchanger 2 is automatically opened and is released, boil-off gas enters air temperature type heater and compressor 3 and is warming up to after normal temperature is pressurized to 5.0MPa, control valve between boil-off gas recycling can 4 and compressor 3 is opened, and the boil-off gas of the pressurization that heats up stores in boil-off gas recycling can 4; Enter LNG Liquefied natural gas tank car 5 after boil-off gas step-down in boil-off gas recycling can 4, LNG Liquefied natural gas tank car 5 internal pressure is raised, by the LNG Liquefied natural gas press-in in LNG Liquefied natural gas tank car 5 in liquefied natural gas (LNG) tank 1; After LNG Liquefied natural gas is all unloaded, between LNG Liquefied natural gas tank car 5 and heat exchanger 2, control valve is opened, remaining boil-off gas in LNG Liquefied natural gas tank car 5 enters air temperature type heater and compressor 3 and is warming up to after normal temperature is pressurized to 5.0MPa, control valve between recycling can and compressor 3 is opened, and the gas evaporation gas after the pressurization that heats up stores in boil-off gas recycling can 4.When in working procedure, when the pressure in liquefied natural gas (LNG) tank 1 is lower than 0.6MPa, the boil-off gas in boil-off gas recycling can 4 passes in liquefied natural gas (LNG) tank 1 by pressure regulation pipeline, is its supplementary tank internal pressure.The present embodiment solves the problem of releasing of BOG gas in LNG gas station of the prior art technique, and alternative current pressurized machine is unloaded processand, has double dominant that is energy-conservation and environmental protection.
Embodiments of the invention provide in order to example with for the purpose of describing, and are not exhaustively or limit the invention to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Claims (6)
1. a pressure recovery Application way for natural gas vaporization gas, is characterized in that, comprise the steps:
After the heat absorption of S1, described liquefied natural gas (LNG) tank, the liquefied natural gas partial in described liquefied natural gas (LNG) tank is evaporated to boil-off gas, for described liquefied natural gas (LNG) tank is pressurizeed;
After the boil-off gas pressure produced in S2, described liquefied natural gas (LNG) tank raises, boil-off gas flows out from the gaseous phase outlet of described liquefied natural gas (LNG) tank;
The described boil-off gas flowed out in S3, described step S2, after intensification pressurization, is stored in boil-off gas recycling can;
LNG Liquefied natural gas tank car is sent into, for pressurizeing in described LNG Liquefied natural gas tank car after boil-off gas step-down in S4, described boil-off gas recycling can;
LNG Liquefied natural gas in S5, described LNG Liquefied natural gas tank car is pressed out in described liquefied natural gas (LNG) tank by high pressure.
2. the pressure recovery Application way of natural gas vaporization gas according to claim 1, it is characterized in that, in step S5, after LNG Liquefied natural gas in described LNG Liquefied natural gas tank car all extrudes, boil-off gas in described LNG Liquefied natural gas tank car flows out from the gaseous phase outlet of described LNG Liquefied natural gas tank car and after the pressurization that heats up, is stored in boil-off gas recycling can.
3. the pressure recovery Application way of natural gas vaporization gas according to claim 1 and 2, is characterized in that, described boil-off gas carries out intensification pressurization by heat exchanger and compressor successively.
4. the pressure recovery Application way of natural gas vaporization gas according to claim 1, is characterized in that, the boil-off gas in described boil-off gas recycling can also can pass in described liquefied natural gas (LNG) tank, is its supplementary tank internal pressure.
5. the pressure recovery Application way of natural gas vaporization gas according to claim 1, is characterized in that, described liquefied natural gas (LNG) tank is also connected with safe diffused gas vaporizer.
6. the pressure recovery Application way of natural gas vaporization gas according to claim 1, is characterized in that, described liquefied natural gas (LNG) tank is also connected with filling machine.
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| CN105736936A (en) * | 2016-04-07 | 2016-07-06 | 自贡通达机器制造有限公司 | Unloading and storing method for liquefied natural gas |
| CN105822894A (en) * | 2016-04-07 | 2016-08-03 | 自贡通达机器制造有限公司 | Natural gas transportation method |
| CN107327697A (en) * | 2017-08-14 | 2017-11-07 | 青岛锐丰源化工有限公司 | The unloading system of device in Gas and liquefied gas |
| CN108150827A (en) * | 2018-02-07 | 2018-06-12 | 贝利智能装备（张家港）有限公司 | A kind of LNG tank vehicle is unloaded method |
| CN108194826A (en) * | 2018-02-07 | 2018-06-22 | 贝利智能装备（张家港）有限公司 | A kind of LNG refueling systems |
| CN108224080A (en) * | 2018-01-16 | 2018-06-29 | 中科睿凌江苏低温设备有限公司 | The dedicated system of the re-liquefied recovery process of mobile natural gas |
| CN108692184A (en) * | 2018-05-03 | 2018-10-23 | 马义涛 | Compression gas storage method automatically controls volatility chemical products gas recovery techniques |
| CN110043790A (en) * | 2018-01-17 | 2019-07-23 | 宁波杭州湾新区科领液化天然气发展有限公司 | A kind of vehicle tank body and tank car |
| CN111503510A (en) * | 2019-01-31 | 2020-08-07 | 乔治洛德方法研究和开发液化空气有限公司 | Method and device for filling a storage container with liquefied gas |
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| CN105736936A (en) * | 2016-04-07 | 2016-07-06 | 自贡通达机器制造有限公司 | Unloading and storing method for liquefied natural gas |
| CN107327697A (en) * | 2017-08-14 | 2017-11-07 | 青岛锐丰源化工有限公司 | The unloading system of device in Gas and liquefied gas |
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| CN108194826B (en) * | 2018-02-07 | 2019-09-10 | 贝利智能装备（张家港）有限公司 | A kind of LNG refueling system |
| CN108194826A (en) * | 2018-02-07 | 2018-06-22 | 贝利智能装备（张家港）有限公司 | A kind of LNG refueling systems |
| CN108150827B (en) * | 2018-02-07 | 2019-10-15 | 贝利智能装备（张家港）有限公司 | A kind of LNG tank vehicle is unloaded method |
| CN108150827A (en) * | 2018-02-07 | 2018-06-12 | 贝利智能装备（张家港）有限公司 | A kind of LNG tank vehicle is unloaded method |
| CN108692184A (en) * | 2018-05-03 | 2018-10-23 | 马义涛 | Compression gas storage method automatically controls volatility chemical products gas recovery techniques |
| CN111503510A (en) * | 2019-01-31 | 2020-08-07 | 乔治洛德方法研究和开发液化空气有限公司 | Method and device for filling a storage container with liquefied gas |
| JP2020125847A (en) * | 2019-01-31 | 2020-08-20 | レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Method and device for filling storage vessel with liquefied gas |
| CN111503510B (en) * | 2019-01-31 | 2022-08-16 | 乔治洛德方法研究和开发液化空气有限公司 | Method and device for filling a storage container with liquefied gas |
| JP7395372B2 (en) | 2019-01-31 | 2023-12-11 | レール・リキード－ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Method and apparatus for filling storage containers with liquefied gas |
| CN113464843A (en) * | 2021-06-18 | 2021-10-01 | 安庆船用电器有限责任公司 | Ship low-speed diesel engine fuel gas supply system |
| CN113464843B (en) * | 2021-06-18 | 2023-03-07 | 安庆船用电器有限责任公司 | Ship low-speed diesel engine fuel gas supply system |
| CN115355441A (en) * | 2022-08-25 | 2022-11-18 | 宜昌江峡船用机械有限责任公司 | LNG storage tank pressurization system and pressurization method |
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Application publication date: 20151209 |