CN103968242A - Energy-saving liquefied natural gas flash steam recovery device - Google Patents
Energy-saving liquefied natural gas flash steam recovery device Download PDFInfo
- Publication number
- CN103968242A CN103968242A CN201410192190.1A CN201410192190A CN103968242A CN 103968242 A CN103968242 A CN 103968242A CN 201410192190 A CN201410192190 A CN 201410192190A CN 103968242 A CN103968242 A CN 103968242A
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- Prior art keywords
- lng
- heat exchanger
- cooling medium
- medium runner
- liquid
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- 239000003949 liquefied natural gas Substances 0.000 title abstract description 68
- 238000011084 recovery Methods 0.000 title abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000002826 coolant Substances 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- 239000000110 cooling liquid Substances 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 29
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 15
- 238000009833 condensation Methods 0.000 claims description 12
- 230000005494 condensation Effects 0.000 claims description 12
- 238000002604 ultrasonography Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 24
- 239000001301 oxygen Substances 0.000 abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 abstract description 24
- 238000000034 method Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000002309 gasification Methods 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an energy-saving liquefied natural gas flash steam recovery device. The energy-saving liquefied natural gas flash steam recovery device comprises an LNG (Liquefied Natural Gas) storage tank (1) and an LNG stop valve (11) fixed on the LNG storage tank, wherein a flash steam outlet pipe is arranged at the upper end of a connecting pipe between the LNG stop valve (11) and a blowoff valve (2); the flash steam outlet pipe is connected to a heat exchanger (3); an LNG return pipe is arranged at the outlet of the heat exchanger (3); the LNG return pie is communicated with the LNG storage tank (1); the outlet of a cooling liquid stop valve (41) fixed on a cooling liquid storage tank (4) is connected into a low temperature liquid pump (8); the outlet of the low temperature liquid pump (8) is connected to the inlet of a first-stage cooling medium runner pipe (31) of the heat exchanger (3); a first-stage cooling condenser (9) is mounted at the outlet of the first-stage cooling medium runner pipe (31). The device has the advantages that liquefied recovery storage for flash steam is realized, the cold energy of low temperature oxygen or nitrogen is repeatedly utilized, and the utilization rate of the low temperature oxygen or nitrogen is improved.
Description
Technical field
The present invention relates to a kind of LNG Liquefied natural gas flashed vapour recovery technology, be specifically related to a kind of energy-saving liquefied rock gas flashed vapour recovering device.
Background technique
LNG Liquefied natural gas (LNG), as a kind of clean energy resource, is used more widely gradually.But be stored in the low-temperature liquefaction rock gas in LNG tank, generating gasification is wanted in the heat transfer that is subject to ambient temperature, in addition, LNG tank also can produce a large amount of gaseous natural gas in topping up process, and these gaseous natural gas are called flashed vapour.Because flashed vapour forms larger pressure in LNG holding vessel, bring danger for fear of flashed vapour to LNG holding vessel, exhaust-valve is installed on LNG holding vessel and reduces LNG holding vessel internal pressure to discharge flashed vapour.This waste of flashed vapour being carried out emptying method and caused on the one hand the energy, gives to discharge place and caused potential safety hazard on the other hand.
Chinese patent literature CN202561436U discloses a kind of " liquefied natural gas filling station flashed vapour recovering device ", on its pipeline in the middle of liquefied natural gas (LNG) tank and air temperature type vaporizer, order is installed first order stop valve, first order atmospheric valve, first order pneumatic valve, and on the pipeline in the middle of air temperature type vaporizer and air reservoir, order is installed electric heater, second level pneumatic valve, compressor, third level pneumatic valve, one-way valve.In the time that LNG Liquefied natural gas pressure tank is higher, first order pneumatic valve is opened, flashed vapour enters compressor and pressurizes through air temperature type vaporizer, electric heater, second level pneumatic valve successively, and the air reservoir that the flashed vapour after pressurization enters gas station by third level pneumatic valve and one-way valve reclaims; In the time that recovering device breaks down, open first order stop valve and first order atmospheric valve to flashed vapour emptying.The flashed vapour that this recovering device has been realized LNG gas station reclaims sale, but the liquefaction that can not realize flashed vapour is reclaimed and is stored, special in the transport and using process of LNG, user does not have corresponding gas holder, these flashed vapours cannot store, can only take emptying measure, still have rock gas waste and potential safety hazard.
Summary of the invention
Technical problem to be solved by this invention is just to provide a kind of energy-saving liquefied rock gas flashed vapour recovering device, and it can be realized the liquefaction of flashed vapour and reclaim storage, and can reuse the cryogenic cold energy of cooling medium, improves the utilization ratio of low-temperature cooling media.
Technical problem to be solved by this invention is to realize by such technological scheme, it includes LNG holding vessel and is fixed on the LNG stop valve on LNG holding vessel, connecting tube upper end between LNG stop valve and exhaust-valve arranges flashed vapour fairlead, flashed vapour fairlead connects heat exchanger, in the outlet of heat exchanger, LNG reflow pipe is set, LNG reflow pipe is communicated with LNG holding vessel, cooling liquid stop valve outlet fixing on cooling liquid storage tank accesses cryogenic liquid pump, cryogenic liquide delivery side of pump connects the entrance of the first order cooling medium runner pipe of heat exchanger, first order cooling condenser is equipped with in the outlet port of first order cooling medium runner pipe, the liquid guide flow pipe of first order cooling condenser is communicated with cooling liquid storage tank or with the cooling medium delivery pipe of cryogenic liquid pump ingress, the gas diversion tube of first order cooling condenser is connected with the entrance of the second level cooling medium runner pipe in heat exchanger.
Preferably, above-mentioned cooling liquid is selected liquid oxygen or liquid nitrogen.
Because the flashed vapour in LNG holding vessel enters heat exchanger by flashed vapour fairlead, the liquid oxygen of emitting from cooling liquid storage tank or liquid nitrogen enter heat exchanger by first order cooling medium runner pipe entrance, flashed vapour in heat exchanger by liquid oxygen or cooled with liquid nitrogen, flashed vapour becomes LNG, liquid LNG flows in LNG holding vessel by LNG reflow pipe, so the present invention has realized the liquefaction of flashed vapour and has reclaimed storage, avoid the waste of rock gas flashed vapour, eliminate potential safety hazard.
Simultaneously, first order cooling condenser is housed in the outlet port of first order cooling medium runner pipe, can realize cryogenic oxygen or nitrogen cooling and liquefaction, liquefaction oxygen or nitrogen are reclaimed and are stored by liquid guide flow pipe, oxygen or the nitrogen of cooling pass into second level cooling medium runner pipe for condensation flashed vapour, reuse like this cold energy of cryogenic oxygen or nitrogen, improved the utilization ratio of cryogenic oxygen or nitrogen.
Because the temperature of liquid oxygen or liquid nitrogen is lower than the temperature of LNG Liquefied natural gas (LNG), and the cost of production of liquid oxygen or liquid nitrogen is lower than the cost of LNG, utilize the liquefy flashed vapour of LNG holding vessel of the cryogenic cold energy of liquid oxygen or liquid nitrogen, the low cost that has completed flashed vapour reclaims, and after liquid oxygen or liquid oxygen gas or nitrogen, discharge enters in atmosphere, do not pollute, realized energy-conserving and environment-protective.
Brief description of the drawings
Brief description of the drawings of the present invention is as follows:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation after Fig. 1 improves;
Fig. 3 is the structural representation of ultrasound velocity condensation separator.
In figure: 1.LNG holding vessel; 11.LNG stop valve; 2. exhaust-valve; 3. heat exchanger; 31. first order cooling medium runner pipes; 32. second level cooling medium runner pipes; 33. third level cooling medium runner pipes; 4. cooling liquid storage tank; 41. cooling liquid stop valves; 8. cryogenic liquid pump; 9. first order cooling condenser; 91. cyclone separators; 92. collapsible tubes; 93. condensation tubes; 94. gas-liquid separators; 95. diffusers; 10. second level cooling condenser.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, the present invention includes LNG holding vessel 1 and be fixed on the LNG stop valve 11 on LNG holding vessel, connecting tube upper end between LNG stop valve 11 and exhaust-valve 2 arranges flashed vapour fairlead, flashed vapour fairlead connects heat exchanger 3, in the outlet of heat exchanger 3, LNG reflow pipe is set, LNG reflow pipe is communicated with LNG holding vessel 1, cooling liquid stop valve 41 outlets fixing on cooling liquid storage tank 4 access cryogenic liquid pumps 8, the outlet of cryogenic liquid pump 8 connects the entrance of the first order cooling medium runner pipe 31 of heat exchanger 3, first order cooling condenser 9 is equipped with in the outlet port of first order cooling medium runner pipe 31, the liquid guide flow pipe of first order cooling condenser 9 is communicated with cooling liquid storage tank 4 or with the cooling medium delivery pipe of cryogenic liquid pump 8 ingress, the gas diversion tube of first order cooling condenser 9 is connected with the entrance of the second level cooling medium runner pipe 32 in heat exchanger 3.The outlet of second level cooling medium runner pipe 32 communicates with atmosphere.
Above-mentioned LNG reflow pipe can be connected on the connecting tube lower end between LNG stop valve 11 and exhaust-valve 2, as shown in the solid line of Fig. 1; Also can be connected on the liquid entering hole of LNG holding vessel 1, as shown in Fig. 1 dotted line.
In the time that the interior flashed vapour pressure of LNG holding vessel 1 reaches setting value, start LNG Liquefied natural gas flashed vapour recovering device of the present invention.Now, LNG stop valve 11 is opened, exhaust-valve 2 is closed, the flashed vapour discharging in LNG holding vessel 1 enters heat exchanger 3 by flashed vapour fairlead, liquid oxygen or liquid nitrogen that the cooling liquid stop valve 41 of installing from cooling liquid storage tank 4 is emitted, enter heat exchanger 3 by cryogenic liquid pump 8 through the entrance of first order cooling medium runner pipe 31, flashed vapour is interior by liquid oxygen or cooled with liquid nitrogen at heat exchanger 3, flashed vapour becomes LNG, liquid LNG flows in LNG holding vessel 1 by LNG reflow pipe, liquid oxygen or liquid nitrogen endothermic gasification simultaneously, the cryogenic oxygen of gasification or nitrogen enter first order cooling condenser 9 from first order cooling medium runner pipe 31 outlets of heat exchanger 3.
Amount at rock gas flashed vapour is too many, cannot all process or when the present invention can not normally use because of fault, open exhaust-valve 2, directly emptying to rock gas flashed vapour, thereby maintains the safety of LNG holding vessel 1.
Because first order cooling condenser 9 has been installed in the outlet port of the first order cooling medium runner pipe 31 of heat exchanger 3, like this, from lowering the temperature condenser 9 condensations by the first order, oxygen out of heat exchanger 3 first order cooling medium runner pipes 31 or nitrogen can reclaim a part of liquid oxygen or liquid nitrogen; Simultaneously, pressurized gas are lowered the temperature by the first order after condenser 9, the temperature of gas also can reduce, so the first order gas diversion tube of condenser 9 of lowering the temperature is connected with the entrance of the second level cooling medium runner pipe 32 in heat exchanger 3, the oxygen of low temperature or nitrogen are introduced in heat exchanger 3, the condensation flashed vapour that is used for lowering the temperature, has improved the utilization ratio of cryogenic oxygen or nitrogen like this.Cryogenic oxygen or nitrogen by the second level cooling medium runner pipe 32 in heat exchanger 3 enter air from outlet.
In order further to increase and to recycle emptying cryogenic oxygen or nitrogen, also can do following improvement:
As shown in Figure 2, cooling condenser 10 in the second level is housed in the outlet port of the second level of heat exchanger 3 cooling medium runner pipe 32, the entrance of the second level cooling gas-liquid honeycomb duct of condenser 10 and the third level cooling medium runner pipe 33 of heat exchanger 3 is connected.The outlet of third level cooling medium runner pipe 33 communicates with atmosphere.
The cryogenic oxygen or the nitrogen that discharge due to the outlet of the second level cooling medium runner pipe 32 from heat exchanger 3 also have suitable air pressure, utilize like this cooling condenser 10 in the second level to oxygen or nitrogen cooling and step-down, obtain the rear oxygen of cooling or nitrogen or gas-liquid mixture, third level cooling medium runner pipe 33 by heat exchanger 3 imports in heat exchanger 3, for cooling flashed vapour, further improve the utilization ratio of cryogenic oxygen or nitrogen.
By that analogy, third level cooling medium runner pipe 33 outlets at heat exchanger 3 refill third level cooling condenser, in the gas-liquid honeycomb duct access heat exchanger 3 of third level cooling condenser, realize cryogenic oxygen or nitrogen is recycled at many levels, until oxygen or the nitrogen pressure of the cooling medium runner pipe outlet of the afterbody of heat exchanger 3 cooling condenser approach barometric pressure.
In Fig. 1 and Fig. 2, cryogenic liquid pump 8 can be selected immersed pump or cryogenic liquide plunger pump.Cryogenic liquid pump 8 can provide first order cooling condenser 9 to the required gas pressure intensity of afterbody cooling condenser working.
First order cooling condenser 9, second level cooling condenser 10 and following cooling condenser at different levels can be selected ultrasound velocity condensation separator, expander refrigeration separator or J-T valve.Wherein, as shown in Figure 3, it comprises cyclone separator 91, collapsible tube 92, condensation tube 93, gas-liquid separator 94 and diffuser 95 to ultrasound velocity condensation separator.High pressure oxygen or nitrogen enter in cyclone separator 91 and rotate via rotating machinery, obtain eddy flow, this eddy flow is in the interior speedup of collapsible tube 92, and the tangent direction in collapsible tube 92 inlet surface produces one or more gas jets, reach the velocity of sound in collapsible tube 92 outlets, thereby enter condensation tube 93 entrances, the air-flow in condensation tube 93 reaches supersonic speed, realizes step-down and cooling.Airspeed is greater than mach one (Ma), according to formula T=T0/ (1+ (γ-1) Ma
2/ 2), the static temperature that wherein T is gas, T0 is that gas enters the temperature before cyclone separator, γ is specific heat ratio, the specific heat ratio of rock gas is greater than 1, when Ma is greater than 1 or when larger, the static temperature T of gas can reduce a lot, now the oxygen of low temperature or nitrogen are enough to reach condensing temperature, liquid nitrogen is thrown on the inwall of condensation tube 93 back segments under strong rotation, in gas-liquid separator 94, be gas-liquid mixture, liquid nitrogen is derived after gas-liquid separation, does not have the oxygen of liquefaction or nitrogen to enter diffuser 95 decelerations, supercharging and intensification and derive.
In order to improve emptying oxygen or nitrogen temperature, realize making full use of of liquid oxygen or liquid nitrogen cold energy, cooling medium runner pipe classification in heat exchanger 3 can be arranged, the cooling medium runner pipe (being called for short afterbody cooling medium runner pipe) being connected with afterbody cooling condenser is placed in flashed vapour ingress, first afterbody cooling medium runner pipe contacts with flashed vapour, and carries out heat exchange; What be close to afterbody cooling medium runner pipe is the cooling medium runner pipe (being called for short the second last level level cooling medium runner pipe) being connected with the second last level cooling condenser, flashed vapour enters the second last level cooling medium runner pipe and carries out heat exchange, finally, first order cooling medium runner pipe 31 is arranged at flashed vapour liquefaction outlet port in heat exchanger 3.Be conducive to like this improve the heat transfer efficiency of cryogenic oxygen or nitrogen and flashed vapour, improve to greatest extent the utilization ratio of liquid oxygen or liquid nitrogen.
Claims (6)
1. an energy-saving liquefied rock gas flashed vapour recovering device, include LNG holding vessel (1) and be fixed on the LNG stop valve (11) on LNG holding vessel, it is characterized in that: the connecting tube upper end between LNG stop valve (11) and exhaust-valve (2) arranges flashed vapour fairlead, flashed vapour fairlead connects heat exchanger (3), outlet at heat exchanger (3) arranges LNG reflow pipe, LNG reflow pipe is communicated with LNG holding vessel (1), at upper fixing cooling liquid stop valve (41) the outlet access cryogenic liquid pump of cooling liquid storage tank (4) (8), the outlet of cryogenic liquid pump (8) connects the entrance of heat exchanger (3) first order cooling medium runner pipe (31), first order cooling condenser (9) is equipped with in the outlet port of first order cooling medium runner pipe (31), the liquid guide flow pipe of first order cooling condenser (9) is communicated with the cooling medium delivery pipe of cooling liquid storage tank (4) or cryogenic liquid pump (8) ingress, the gas diversion tube of first order cooling condenser (9) is connected with the entrance of the second level cooling medium runner pipe (32) in heat exchanger (3).
2. the energy-saving liquefied rock gas flashed vapour of one according to claim 1 recovering device, it is characterized in that: second level cooling condenser (10) is housed in the outlet port of the second level of heat exchanger (3) cooling medium runner pipe (32), and the gas-liquid honeycomb duct of second level cooling condenser (10) is connected with the entrance of the third level cooling medium runner pipe (33) in heat exchanger (3).
3. the energy-saving liquefied rock gas flashed vapour of one according to claim 2 recovering device, it is characterized in that: refill third level cooling condenser in third level cooling medium runner pipe (33) outlet, in the gas-liquid honeycomb duct access heat exchanger (3) of third level cooling condenser.
4. according to the energy-saving liquefied rock gas flashed vapour of the one recovering device described in claim 1,2 or 3, it is characterized in that: first order cooling condenser (9), second level cooling condenser (10) and third level cooling condenser are ultrasound velocity condensation separator, expander refrigeration separator or J-T valve.
5. according to the energy-saving liquefied rock gas flashed vapour of the one described in claim 2 or 3 recovering device, it is characterized in that: the cooling medium runner pipe classification in heat exchanger (3) is arranged, afterbody cooling medium runner pipe is placed in flashed vapour ingress, what be close to afterbody cooling medium runner pipe is the second last level level cooling medium runner pipe, and first order cooling medium runner pipe (31) is arranged at flashed vapour liquefaction outlet port in heat exchanger (3).
6. according to the energy-saving liquefied rock gas flashed vapour of the one recovering device described in claim 1,2 or 3, it is characterized in that: described cooling liquid is liquid oxygen or liquid nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192190.1A CN103968242B (en) | 2014-05-08 | A kind of energy-saving liquefied natural gas flashed vapour retracting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192190.1A CN103968242B (en) | 2014-05-08 | A kind of energy-saving liquefied natural gas flashed vapour retracting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103968242A true CN103968242A (en) | 2014-08-06 |
| CN103968242B CN103968242B (en) | 2016-11-30 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595710A (en) * | 2015-01-21 | 2015-05-06 | 中冶东方工程技术有限公司 | Recovery system and method of residual liquid of liquefied natural gas |
| CN105179930A (en) * | 2015-09-30 | 2015-12-23 | 赛鼎工程有限公司 | Liquefied natural gas tank car unloading device of liquefied natural gas and compressed natural gas cooperative station and application |
| CN107726045A (en) * | 2017-09-29 | 2018-02-23 | 深圳市燃气集团股份有限公司 | A kind of BOG liquefaction recycling systems of liquefied natural gas |
| CN109579351A (en) * | 2018-11-19 | 2019-04-05 | 中国人民解放军战略支援部队航天工程大学 | Big flow liquid oxygen based on Supersonic Ejector crosses cooling method |
| CN109677565A (en) * | 2019-01-07 | 2019-04-26 | 舟山博睿船舶科技开发有限公司 | LNG ship oceangoing ship conveying refrigeration system and its freezing material delivery method |
| CN109681776A (en) * | 2019-01-15 | 2019-04-26 | 江苏科技大学 | A kind of BOG is re-liquefied to regasify integrated system and working method with LNG |
| US11460244B2 (en) | 2016-06-30 | 2022-10-04 | Baker Hughes Oilfield Operations Llc | System and method for producing liquefied natural gas |
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| JP2013036676A (en) * | 2011-08-08 | 2013-02-21 | Air Water Inc | Method for removing nitrogen from boil off gas, and nitrogen removing apparatus for use with the same |
| CN103547787A (en) * | 2011-03-22 | 2014-01-29 | 大宇造船海洋株式会社 | System for supplying fuel to high-pressure natural gas injection engine having excess evaporation gas consumption means |
| CN203868680U (en) * | 2014-05-08 | 2014-10-08 | 重庆大学 | Energy-saving type recovery device of flash steam of LNG (Liquefied Natural Gas) |
Patent Citations (8)
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| JPH05263998A (en) * | 1992-03-23 | 1993-10-12 | Osaka Gas Co Ltd | Cold storage of cryogenic liquefied natural gas and effective utilizing method and device thereof |
| JP2001132896A (en) * | 1999-11-08 | 2001-05-18 | Osaka Gas Co Ltd | Boil-off gas reliquefying method |
| CN101223260A (en) * | 2005-07-19 | 2008-07-16 | 信永重工业株式会社 | Lng bog reliquefaction apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595710A (en) * | 2015-01-21 | 2015-05-06 | 中冶东方工程技术有限公司 | Recovery system and method of residual liquid of liquefied natural gas |
| CN105179930A (en) * | 2015-09-30 | 2015-12-23 | 赛鼎工程有限公司 | Liquefied natural gas tank car unloading device of liquefied natural gas and compressed natural gas cooperative station and application |
| US11460244B2 (en) | 2016-06-30 | 2022-10-04 | Baker Hughes Oilfield Operations Llc | System and method for producing liquefied natural gas |
| CN107726045A (en) * | 2017-09-29 | 2018-02-23 | 深圳市燃气集团股份有限公司 | A kind of BOG liquefaction recycling systems of liquefied natural gas |
| CN109579351A (en) * | 2018-11-19 | 2019-04-05 | 中国人民解放军战略支援部队航天工程大学 | Big flow liquid oxygen based on Supersonic Ejector crosses cooling method |
| CN109677565A (en) * | 2019-01-07 | 2019-04-26 | 舟山博睿船舶科技开发有限公司 | LNG ship oceangoing ship conveying refrigeration system and its freezing material delivery method |
| CN109681776A (en) * | 2019-01-15 | 2019-04-26 | 江苏科技大学 | A kind of BOG is re-liquefied to regasify integrated system and working method with LNG |
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Granted publication date: 20161130 |