CN101016857A - Liquefied natural gas double-driving automobile circulatory system based on opening Rankine cycle - Google Patents

Liquefied natural gas double-driving automobile circulatory system based on opening Rankine cycle Download PDF

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Publication number
CN101016857A
CN101016857A CNA2007100174018A CN200710017401A CN101016857A CN 101016857 A CN101016857 A CN 101016857A CN A2007100174018 A CNA2007100174018 A CN A2007100174018A CN 200710017401 A CN200710017401 A CN 200710017401A CN 101016857 A CN101016857 A CN 101016857A
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China
Prior art keywords
lng
heat exchanger
gas
decompressor
regenerator
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CNA2007100174018A
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CN100434665C (en
Inventor
厉彦忠
梁骞
谭宏博
蒲亮
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CNB2007100174018A priority Critical patent/CN100434665C/en
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Publication of CN100434665C publication Critical patent/CN100434665C/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/30Use of alternative fuels, e.g. biofuels

Abstract

The invention discloses a LNG vehicle dual-power circulate system, comprising a LNG pot whose bottom outlet via a flux control valve is connected with a LNG low-temperature liquid pump which via a heat exchange tube of a cold recycler is connected with a gas pot. The gas pot is communicated with a heat reflux device connected with a heat exchanger whose outlet is connected with an expander. The expander extracts gas to be fed into the heat exchanger to return the temperature and expand continuously. The outlet of the expander is connected with the heat reflux device connected with a natural gas internal combustion engine whose air outlet is connected with the heat exchanger to release some heat into air. The invention uses natural gas opening circulation and former internal combustion to form LNG dual-power vehicle circulate system to recycle the cold of LNG completely, while it can reduce the discharge temperature of internal combustion engine or the like.

Description

Liquefied natural gas double-driving automobile circulatory system based on the open type Rankine cycle
Technical field
The present invention relates in LNG Liquefied natural gas (Liquefied Natural Gas, the be called for short LNG) automobile cold and cold as the LNG of automotive fuel The recovery comprehensive utilization technique.Be specifically related to utilize Rankine cycle of LNG open type and rock gas internal-combustion engine to form the system of double-driving automobile.
Background technique
In recent years, the production application of World LNG development is rapid, and annual average rate of increase is up to 20%, and a year transit trade volume reaches more than 6,000 ten thousand tons.Be the restriction emission of automobile wastes, world many countries and local authority carry out the LNG automobile to take government's support policy, and this has created good condition for the development of LNG automobile.The application of China LNG also comes into one's own gradually.Along with continuing to increase of LNG demand, the fairly large LNG receiving stations in ground such as Shenzhen, Xiamen, Ningbo build up successively; The abundant natural gas resource in Asia-Pacific and Middle East also can be used as the important base that China introduces rock gas.Believe progressively perfect along with auxiliary facilities such as LNG produces and charges, meterings, the LNG automobile of China also can be obtained tremendous development.
With respect to petroleum resources, the natural gas resource of China is than horn of plenty, particularly central and west regions.And excessively use petroleum products also to cause the serious day by day of pollution of atmosphere as automotive fuel.Compare with other substitute fuels, rock gas has greater advantage as automotive fuel.The narrow limitation of liquefied petroleum gas (LPG) and solar energy self has determined them to be difficult to big development.The operating cost of hydrogen and methyl alcohol is higher, and the application technology of hydrogen is also far immature.By contrast, gas reserves is abundant, pollution is little, efficient is high, noise is little, technology is also comparatively ripe.
Compare with the LNG automobile, compressed natural gas (Compressed Natural Gas, abbreviation CNG) disadvantage of automobile is that storage volume is big, gas-storing capacity is little, energy storage density is low, the continuous distance travelled of automobile is short, the aerating time is long, and pressure store height (more than the 20MPa), the manufacturing of gas storage steel cylinder is required high, dangerous big.LNG is that it is that rock gas is liquefied under the low temperature of 111K than the CNG fuel of high-quality more, the volume that takes up room little (only for liquefaction front volume 1/625), energy storage density is big, in liquefaction process, at first to carry out purification process, separate condensate, heavy hydrocarbon, remove H 2O, CO 2, H 2Impurity such as S and organic sulfur compound.Therefore, LNG is sulfur-bearing and nitrogen not, and its main component is CH 4, stay in grade, it is easy to adjust to burn, no black smoke, burning no lime-ash in back and tar, main effulent is H 2O and CO 2, can be rated as green fuel.And a large amount of cold energy that contain under its low temperature can be recycled.Thereby the LNG automobile is the important directions of following gas-fueled vehicles development.
But the LNG automobile also has the some shortcomings part.Because reasons such as the cylinder intake volumetric efficiency is less, and heat vale of mixture is low are compared with the petrol engine with discharge capacity, the power of natural gas engine decreases.Much do not having on the LNG automobile of cold energy reclamation device, heating up as the LNG of automotive fuel directly enters engine combustion after the gasification, makes the cold energy resource of a large amount of preciousnesses of containing among the LNG waste.Therefore, utilize following of LNG low temperature to have cold Acting ability outputting power, reclaim its cold, the research work of carrying out the LNG double-driving automobile has Practical significance very much.
Summary of the invention
The objective of the invention is to, the LNG double-driving automobile system of Rankine cycle of a kind of LNG of utilization open type and rock gas engine cycle is provided.LNG not only has a large amount of cold energy under the low temperature, and also has quite a few to have the cold of acting ability This system utilizes the temperature difference between LNG low temperature and the rock gas I. C. engine exhaust high temperature, from as working medium, makes up open type Rankine cycle outputting power with LNG, has not only fully reclaimed the cold of LNG, and has effectively utilized its cold The acting ability, not only realized the transfer of the contained cold energy of LNG " amount ", and realized utilization its " matter ".
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of liquefied natural gas double-driving automobile circulatory system based on the open type Rankine cycle, comprise the LNG storage tank, it is characterized in that, described LNG tank bottom outlet is connected with cryogenic liquid pump by flow control valve, the cryogenic liquide delivery side of pump links to each other with cold energy recovering device (as vehicle-mounted food refrigerator), the cold energy recovering device is also connecting air collector, the other end of air collector connects regenerator, regenerator also is communicated with heat exchanger, rock gas after heat exchanger heats up enters decompressor, by decompressor expansion step-down, when pressure reaches the centre suction pressure, extraction enters the heat exchanger rewarming, and the rock gas behind the rewarming enters decompressor and continues acting.Decompressor also links to each other with regenerator, and the rock gas behind regenerator enters the combustion in IC engine acting, and internal combustion engine exhaust pipe is connected with heat exchanger, discharges gas and enter atmosphere behind heat exchanger.
The present invention has made full use of the cold that is contained among the LNG under the low temperature The acting ability, when reclaiming the LNG cold, can also reclaim its valuable more cold , when improving the LNG vehicle dynamic quality, also can satisfy the refrigeration requirement of cooling apparatus in the car; In addition, can also make the I. C. engine exhaust temperature obtain to a certain degree reduction, effects of energy conservation and environmental protection is more obvious.
Description of drawings
Accompanying drawing 1 is a LNG double-driving automobile circulatory system structural representation of the present invention.
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment
LNG double-driving automobile circulatory system of the present invention comprises: LNG storage tank 1, and LNG cryogenic liquid pump 2, cold energy reclamation device 3, air collector 4, regenerator 5, heat exchanger 6, decompressor 7, rock gas internal-combustion engine 8, LNG flow control valve F1, and connecting pipeline etc.
The Placement of said apparatus is in proper order: from the LNG of LNG storage tank 1 bottom outlet C1, through LNG flow control valve F1, connect LNG cryogenic liquid pump 2, meet the heat exchanger channels C2 → C3 of cold energy reclamation device 3, connect air collector 4, air collector 4 meets the heat exchanger channels C4 → C5 of regenerator 5, and connect decompressor 7 by the heat exchanger channels C5 → C6 of heat exchanger 6, the decompressor 7 C7 → C8 that bleeds connects the heat exchanger channels of heat exchanger 6 and takes back decompressor 7, decompressor 7 export gas channel C 9 → C10 connects the suction port that regenerator 5 backs connect rock gas internal-combustion engine 8, and internal-combustion engine 7 exhaust outlets meet the heat exchanger channels C11 → C12 of heat exchanger 6.
The method of operation of said apparatus is as follows:
LNG enters LNG cryogenic liquid pump 2 from storage tank 1 and is pressurized to about 4MPa, in heat exchanger channels C2 → C3 in cold energy reclamation device 3 by middle refrigerant heat temperature raising to the 268K, enter the air collector voltage stabilizing, enter again in the regenerator 5 passage of heat C4 → C5 with discharge rock gas from decompressor and carry out heat exchange, temperature is increased to about 547K, after enter heat exchanger 6 heat exchanger channels C5 → C6 and the heat exchange of rock gas I. C. engine exhaust, temperature enters decompressor 7 expansion step-downs after further raising, in the middle of reaching, extracts pressure in heat exchanger channels C7 → C8 that rock gas enters heat exchanger 6 exhaust gas heat exchanging rewarming with the rock gas internal-combustion engine during suction pressure out to the initial temperature that expands, enter decompressor then and continue the expansion step-down, part in the expansion work of defeated mountain is used to drive LNG cryogenic liquid pump 2, gas temperature after the expansion is still higher, enter the acting of rock gas combustion in IC engine after entering decompressor export gas channel C 9 → C10 release heat of regenerator 5, the gas after the acting enters atmosphere after entering the heat exchanger channels C11 → C12 release heat of heat exchanger 6.
LNG double-driving automobile circulatory system of the present invention is compared the technique effect that brings with traditional LNG automotive system:
1, utilize cold energy reclamation device to reclaim the cold of LNG under the low temperature, be used for cooling equipments such as vehicle-mounted food refrigerator and car air conditioner, problems such as the noise of having avoided the additional mechanical refrigeration plant to bring is big, maintenance difficulty, leakage of refrigerant pollution, and need not the external world energy is provided, save the motor car engine power consumption.
2, structure is the open type Rankine cycle of working medium with the rock gas between LNG low temperature and the rock gas I. C. engine exhaust high temperature by utilizing, with the LNG automobile double power circulation system that original rock gas engine cycle is formed, when utilizing the LNG cold, can also fully recycle and contain valuable more cold under the low temperature among the LNG with acting ability , at the formation characteristics of LNG cold energy, realize the transfer of LNG cold energy " amount " and the utilization of " matter " simultaneously, this is maximum characteristics of the present invention.
3, gas temperature and the rock gas I. C. engine exhaust temperature after the expansion is higher, rock gas before can in regenerator and heat exchanger, adding thermal expansion, whole device need not the external world heat is provided, and has fully utilized the heat of internal system, realizes inner heat (cold) balance.
4, rock gas I. C. engine exhaust temperature after the heat exchanger release heat decreases, and helps environmental protection.

Claims (1)

1. liquefied natural gas double-driving automobile circulatory system based on the open type Rankine cycle, comprise LNG storage tank (1), it is characterized in that, the bottom outlet of described LNG storage tank (1) is connected with cryogenic liquid pump (2) by flow control valve (F1), the outlet of cryogenic liquid pump (2) links to each other with cold energy recovering device (3), cold energy recovering device (3) also connects air collector (4), the other end of air collector (4) connects regenerator (5), regenerator (5) also is communicated with heat exchanger (6), rock gas after heat exchanger (6) heats up enters decompressor (7), by decompressor (7) expansion step-down, when pressure reaches the centre suction pressure, extract rock gas out and enter heat exchanger (6) rewarming, the rock gas behind the rewarming enters decompressor (7) and continues acting; Decompressor (7) also links to each other with regenerator (5), and the rock gas behind regenerator (5) enters internal-combustion engine (8) work by combustion, and internal-combustion engine (8) exhaust duct is connected with heat exchanger (6), and the gas of internal-combustion engine (8) being discharged by heat exchanger (6) enters atmosphere.
CNB2007100174018A 2007-02-12 2007-02-12 Liquefied natural gas double-driving automobile circulatory system based on opening Rankine cycle Expired - Fee Related CN100434665C (en)

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CN100434665C CN100434665C (en) 2008-11-19

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102679474A (en) * 2011-03-14 2012-09-19 许伯彦 Automobile air-conditioner system capable of recovering cold energy of liquefied natural gas (LNG)
CN102812211A (en) * 2010-03-25 2012-12-05 丰田自动车株式会社 Rankine cycle system
CN103437870A (en) * 2013-07-24 2013-12-11 中国科学院工程热物理研究所 System and method for comprehensively utilizing residual heat of compressed natural gas engine (CNGE)
CN104948303A (en) * 2015-05-25 2015-09-30 沈阳航空航天大学 Fuel supply system applied to aircraft engine taking LNG (Liquefied Natural Gas) as fuel
CN105781787A (en) * 2016-04-28 2016-07-20 中国船舶重工集团公司第七〇九研究所 Recovering system for LNG fuel tail gas waste heat
CN108645080A (en) * 2018-05-30 2018-10-12 天津商业大学 Spherical natural gas waste cold condensing heat exchanger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5295350A (en) * 1992-06-26 1994-03-22 Texaco Inc. Combined power cycle with liquefied natural gas (LNG) and synthesis or fuel gas
CN2256938Y (en) * 1996-05-13 1997-06-25 杨忠义 Automobile capable of separately using two fuels of liquified natural gas and gasoline
CN100434292C (en) * 2003-01-17 2008-11-19 西安交通大学 Car air conditioner making use of quantity of cold of liquefied natural gas
JP4137018B2 (en) * 2004-07-02 2008-08-20 トヨタ自動車株式会社 Heating device for liquefied gas fuel supply system
JP2006348752A (en) * 2005-06-13 2006-12-28 Kawasaki Shipbuilding Corp Evaporated-gas supply system for liquefied natural gas-carrying vessel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102812211A (en) * 2010-03-25 2012-12-05 丰田自动车株式会社 Rankine cycle system
CN102812211B (en) * 2010-03-25 2015-01-07 丰田自动车株式会社 Rankine cycle system
CN102679474A (en) * 2011-03-14 2012-09-19 许伯彦 Automobile air-conditioner system capable of recovering cold energy of liquefied natural gas (LNG)
CN102679474B (en) * 2011-03-14 2015-12-16 许伯彦 A kind ofly reclaim the automotive air-conditioning system of cold energy of liquefied natural gas for cold air distribution
CN103437870A (en) * 2013-07-24 2013-12-11 中国科学院工程热物理研究所 System and method for comprehensively utilizing residual heat of compressed natural gas engine (CNGE)
CN103437870B (en) * 2013-07-24 2016-04-06 中国科学院工程热物理研究所 A kind of CNG engine waste heat comprehensive utilization system
CN104948303A (en) * 2015-05-25 2015-09-30 沈阳航空航天大学 Fuel supply system applied to aircraft engine taking LNG (Liquefied Natural Gas) as fuel
CN105781787A (en) * 2016-04-28 2016-07-20 中国船舶重工集团公司第七〇九研究所 Recovering system for LNG fuel tail gas waste heat
CN108645080A (en) * 2018-05-30 2018-10-12 天津商业大学 Spherical natural gas waste cold condensing heat exchanger

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Granted publication date: 20081119

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