CN101943319A - Liquefied natural gas (LNG) storage tank for bilayer vacuum brazing vehicle - Google Patents

Liquefied natural gas (LNG) storage tank for bilayer vacuum brazing vehicle Download PDF

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Publication number
CN101943319A
CN101943319A CN 201010235644 CN201010235644A CN101943319A CN 101943319 A CN101943319 A CN 101943319A CN 201010235644 CN201010235644 CN 201010235644 CN 201010235644 A CN201010235644 A CN 201010235644A CN 101943319 A CN101943319 A CN 101943319A
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China
Prior art keywords
tank body
vacuum
lng
natural gas
liquefied natural
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CN 201010235644
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Chinese (zh)
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吴一鹏
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GAOYOU RONGQING MACHINERY ELECTRONICS CO Ltd
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GAOYOU RONGQING MACHINERY ELECTRONICS CO Ltd
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Priority to CN 201010235644 priority Critical patent/CN101943319A/en
Publication of CN101943319A publication Critical patent/CN101943319A/en
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Abstract

The invention discloses a liquefied natural gas (LNG) storage tank for a bilayer vacuum brazing vehicle. The LNG storage tank comprises a liquid charging pipe, an inner tank body, a counter radiation screen, a vacuum shell, a bilayer vacuum space and an outer tank body, wherein the outer tank body is internally provided with the inner tank body; the liquid charging pipe penetrates through the outer tank body and then extends into the inner tank body; the vacuum shell is arranged between the outer tank body and the inner tank body; and the counter radiation screen is arranged between the vacuum shell and the inner tank body, so that the bilayer vacuum space is formed between the vacuum shell and the inner tank body. The invention can keep the vacuum constant, can be used for long term, has constant heat insulation effect, is in no need of maintaining the vacuum once every two years, and has safety performance higher than that of the existing tank body simultaneously.

Description

The Vehicular liquefied rock gas liquid container of double-layer vacuum soldering
Technical field
The present invention relates to a kind of rock gas storage facilities, be specifically related to a kind of Vehicular liquefied rock gas liquid container.
Background technique
Along with the fast development of current automotive industry, the disaster of the human energy shortage that is faced with at present, environmental deterioration.With vapour, diesel oil is that the tail gas pollution of motor-driven vehicle of power has become each big and medium-sized cities air-polluting primary pollution source of China, and the city people's living environment in serious threat.Substituting gasoline and diesel oil acts as a fuel to motor vehicle provide power with rock gas or coal-seam gas (CH4), can reduce the discharge amount of exhaust pollutant significantly, is the effective measures that solve urban atmospheric pollution.
LNG Liquefied natural gas (LNG) is a kind of special existence of rock gas, is the cryogenic liquide that forms by cooling after the natural gas purification, and main component is a methane, and under atmospheric pressure, the boiling temperature of LNG is about-162 ℃.Lower boiling temperature requires LNG Liquefied natural gas will dewater in process of production, take off hydrocarbon, desulfurization, take off CO 2Etc. purified treatment, therefore, compare cleaner, more environmental protection when LNG Liquefied natural gas is used as automotive fuel with compressed natural gas.Domestic part uses the city service data in recent years of LNG bus to show: the LNG bus is saved the energy 23~33% with the class diesel-oil vehicle.According to the document introduction, CO reduces 98%, and HC reduces 70%, and NO reduces 39%, CO 2Reduce 24%, SO 2Reduce 90%.Simultaneously since the octane value of methane up to more than 120, the capability of antidetonance improves, and has reduced engine noise effectively.
Because Gas Prices is generally at 3.2 yuan/m 3, and the 93# gas price is at 6.46 yuan/liter, and one cube rock gas, its calorific value is equivalent to 1.13 liters of 93# gasoline, so the price ratio is 1: 2.28.With mining area, Xinjiang use condition for example, 45 liters/100 kilometers of this mining area style transport vehicle oil consumption, 700 kilometers of per car every days, 315 liters of oil consumptions, 2034.9 yuan of expenses.After using rock gas instead, same mileage, 278.76 cubes of oil consumption rock gases, 892.04 yuan of expenses can be saved 1142.86 yuan every day, calculate in 300 days according to year work, can save 342859.39 yuan, almost are equal to the price of a car.The price of LNG Liquefied natural gas, more lower slightly than Gas Prices, for 97% of Gas Prices, almost equal.Therefore use LNG Liquefied natural gas, can save a large amount of operating costs equally.
Rock gas mainly contains two kinds of forms, LNG Liquefied natural gas (LNG) and compressed natural gas (CNG) on automobile-used.What use was more at present is compressed natural gas.But, because the density of compressed natural gas, mainly rely on the pressurization of gas to compress and improve, 25Mpa is generally arranged, 20Mpa, 16Mpa, even the gas tank of 25Mpa, the 130-150 kilometer generally also only can the steam supply car travels.And volume is 625 times behind the liquefied natural gas gasifying, with 2.5Mpa rock gas ratio, is its 2.5 times.The annotate LNG Liquefied natural gas of same volume, the 350-450 kilometer can travel.Therefore, LNGV (liquefied natural gas vehicle) will obtain significant progress.
And the pressure store of LNG Liquefied natural gas is generally at 0.05-0.5Mpa, and compressed natural gas is then wanted 25Mpa, and therefore, LNG Liquefied natural gas stores safer.The weight of tank body also reduces over half than the compression rock gas.LNG Liquefied natural gas and compressed natural gas have identical physics and chemical property, and proportion only is 1/5 of air, and burning can be evaporated rapidly, and upwards fly away when LNG is leaked, rather than downward gathering as gasoline or diesel oil.The aerial concentration of LNG steam will reach more than 5% and just can burn in addition, as long as two reach 1.4% unlike diesel oil or gasoline, even 0.6% above will the burning.In addition, the initiation temperature of LNG will arrive 540 ℃, far above diesel oil or gasoline 220-225 ℃.Therefore, brainstrust thinks, as long as understood the character of LNG, and goes operation according to certain safety specification, and its Security in use is also littler than diesel oil or gasoline.So long as not confined space, rock gas can not explode.Analyze from explosion energy, for 1 60L, splendid attire pressure is the CNG gas cylinder of 25MPa, and the energy of the physical explosion of its generation is E:3.085MJ; 2.5 the physical explosion energy of the CNG gas cylinder of individual 60L is 7.713MJ.As the actual volume 60L of LNG gas cylinder, that is, and 25.56kg, maximum pressure P one 0.9MPa (absolute pressure) that safety installations is set, external pressure Po one 0.1MPa.The physical explosion energy is 1.304M J.As can be seen, even blast, LNG is also little a lot of than CNG explosion energy, also just means, its loss can be little a lot.
In sum, more energy-conserving and environment-protective, the LNGV (liquefied natural gas vehicle) that usage safety performance is higher has many-sided advantages such as operation price and distance travelled, and the current society more and more paying attention to environmental protection and safety has boundless development prospect.A considerable amount of LNG automobiles have been arranged in the world in operation, wherein, the U.S. accounts for about half.Japan is the World LNG importer of last resort, and the LNG development of automobile is very fast.In recent years, China was also introducing further perfect LNG automotive engineering on the basis of LNG.At present, in China Zhanjiang, ground such as Guizhou, Hangzhou, Changsha, Erdos, the Inner Mongol has many LNG buses and taxi is travelling.Huge and deep variation is taking place in China's Motor Vehicle power fuel structure, strides forward to direction green more, environmental protection more.In several years from now on, developing rapidly of LNG automobile will be an inevitable trend.And supporting with it Vehicular liquefied rock gas liquid container is the requisite vitals of LNGV (liquefied natural gas vehicle).
According to the data introduction, the Liquefied Natural Gas Import jar, the price that reserves are 300 liters is generally at 60,000 yuan, domestic same product, price is also wanted 3.25 ten thousand yuan, its main LNG fuel system of automobile mainly is made up of LNG fuel pot, connecting pipeline, vaporizing unit, decompressor, safety installations and control system etc., and the LNG fuel pot is the core component of LNG onboard fuel system, and its effect is to store and fueling.When LNGV (liquefied natural gas vehicle) was worked, the liquified natural gas in the fuel pot flowed out the LNG fuel pot from the liquid discharge tube road under the effect of self pressure, entered through fuel cutoff valve and Restrictor Valves and was heated vaporization in the vaporizer, and the steam supply car uses.
Vehicular liquefied natural gas storage tank is a kind of Cryo Heat Insulation pressurized container, existing liquid container is the vacuum jacket structure, its structure is as shown in Figure 1: comprise liquid feeding pipeline 1, interior tank body 2, wound insulation layer 3, vacuumize space 4 and outer tank body 5, interior tank body is used for storing the low-temperature liquefaction rock gas, be tied with multilayer insulant at its outer wall, have superpower heat-shielding performance, chuck (space between the inside and outside tank body) is pumped into high vacuum simultaneously, forms good adiabatic system jointly.
This shows that the technical barrier that existing LNG Liquefied natural gas liquid container exists is the degree of vacuum that how to guarantee liquid container.But, because the structure of existing liquid container is the thermoinsulation material of multi-lay winding, the method that vacuumizes again.Its multilayer insulant is a kind of by aluminium and glass fibre, or aluminium and the common paper tinsel shape composite material of forming of other macromolecular materials, in vacuum environment, organic principle wherein can progressively discharge, thereby make vacuum environment constantly destroy, and heat-insulating property constantly descends, and the steam output of rock gas constantly rises, Economy descends, and potential safety hazard increases the weight of.Though during design, sorbing material used, but also just play the effect that slows down gas release, can not thoroughly address the above problem.
What LNG automotive system maintenance difficulties maximum, cycle were the longest is that storage tank degree of vacuum is safeguarded.Storage tank degree of vacuum is safeguarded and is divided into two kinds of methods, the first is pulled down storage tank and is sent to steel cylinder manufacturer and carries out vacuum and safeguard from car, the method can make storage tank reach higher degree of vacuum, but labor intensity is big, the cycle is long, need dismounting and transportation storage tank, safeguard that a storage tank vacuum needs 30 day time at least, influence user's vehicle and use that it is not quick, the most economic method that practical operation is got up obviously.Beijing LNG science and technology demonstration site is devoted to the research and development of the on-the-spot degree of vacuum attending device of storage tank always, successfully developed the on-the-spot vacuum pumping device of a cover now, this device does not need Vehicular liquefied gas cylinder is pulled down from vehicle body, safeguards that a storage tank vacuum also needs 7 day time.
Summary of the invention
The objective of the invention is in order to overcome the deficiencies in the prior art, provide a kind of double-layer vacuum soldering Vehicular liquefied rock gas liquid container.
The technical solution used in the present invention is: the Vehicular liquefied rock gas liquid container of a kind of double-layer vacuum soldering, comprise liquid feeding pipeline, interior tank body, antiradiation screen, vacuum casting, double-layer vacuum space and outer tank body, be provided with interior tank body in the described outer tank body, described liquid feeding pipeline passes outer tank body and extend in the interior tank body, be provided with vacuum casting between described outer tank body and the interior tank body, be provided with antiradiation screen between vacuum casting and the interior tank body, and make formation double-layer vacuum space between this vacuum casting and the interior tank body.
As preferably, the material of described vacuum casting is the Austenitic Stainless Steel that handle through polishing on the surface.
As preferably, be provided with the heat insulation foam packed layer between described vacuum casting and the outer tank body.
Use the liquid container of vacuum brazing structure, in the vacuum brazing process, degree of vacuum can reach 1 * 10 -3Pa, brazing temperature reaches more than 1100 ℃, because the high temperature high vacuum, moisture that can metal material surface is remaining, greasy dirt obtain decomposing, and discharge by vacuum system; Labile metallic oxide also can be reduced to parent metal in the high-temperature vacuum environment.When temperature is reduced under the low temperature Environmental Conditions, its degree of vacuum not only can not reduce, and also can further improve.
In vacuum environment, transmission of heat is only carried out in the mode of radiation.The material that we use is an Austenitic Stainless Steel, and the surface adopts polishing to handle, and its radiation blackness is 0.074 only, has very strong reflecting effect, therefore can greatly reduce radiation heat transfer, thereby reaches adiabatic effect.In vacuum tank, design has increased the antiradiation screen, adopts vacuum evaporation process, can further reduce below the radiation heat transfer to 1/8.
In order further to improve the insulation effect of tank body, between interior tank body and outer tank body, we have designed foam-filled layer of one deck again, adopted fire retardant foam, both can improve insulation effect, can also reduce the temperature difference of case surface and environment, prevent in the operating process injury human body.Foamed material can also play the effect of buffering vibration isolation, the safety of tank body when bump takes place vehicle in the protection.Fire retardant foam just in case take place can form the foaming barrier layer with coke skin structure under the situation of burning, burns away thereby intercept.
Beneficial effect of the present invention: adopt the Vehicular liquefied rock gas liquid container of double-layer vacuum soldering, compare with original tank body, its day the rock gas steam output, by original<2%, can bring up to<1% level.That is to say, can prolong and store one times of fate, perhaps, reduce daily evaporation amount half.And its maximum benefit is, this tank body can guarantee to keep the vacuum constant, the long-term use, and insulation effect is constant, does not need every two years vacuum once to safeguard that simultaneously, Safety performance is also higher than original tank body.
Description of drawings
Fig. 1 is existing Vehicular liquefied rock gas liquid storage tank structure schematic representation;
Fig. 2 is a liquid storage tank structure schematic representation of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments:
As shown in Figure 2: the Vehicular liquefied rock gas liquid container of a kind of double-layer vacuum soldering, comprise liquid feeding pipeline 1, interior tank body 2, antiradiation screen 6, vacuum casting 7, double-layer vacuum space 8 and outer tank body 5, tank body 2 in being provided with in the described outer tank body 5, described liquid feeding pipeline 1 passes outer tank body 5 and extend in the interior tank body 2, be provided with vacuum casting 7 between described outer tank body 5 and the interior tank body 2, be provided with antiradiation screen 6 between vacuum casting 7 and the interior tank body 2, and make formation double-layer vacuum space 8 between this vacuum casting 7 and the interior tank body 2.
The material of described vacuum casting 7 is the Austenitic Stainless Steel that handle through polishing on the surface.Be provided with heat insulation foam packed layer 9 between described vacuum casting 7 and the outer tank body 5.

Claims (3)

1. Vehicular liquefied rock gas liquid container of double-layer vacuum soldering, it is characterized in that: comprise liquid feeding pipeline (1), interior tank body (2), antiradiation screen (6), vacuum casting (7), double-layer vacuum space (8) and outer tank body (5), be provided with interior tank body (2) in the described outer tank body (5), described liquid feeding pipeline (1) passes outer tank body (5) and extend in the interior tank body (2), be provided with vacuum casting (7) between described outer tank body (5) and the interior tank body (2), be provided with antiradiation screen (6) between vacuum casting (7) and the interior tank body (2), and make formation double-layer vacuum space (8) between this vacuum casting (7) and the interior tank body (2).
2. the Vehicular liquefied rock gas liquid container of double-layer vacuum soldering according to claim 1 is characterized in that: the Austenitic Stainless Steel that the material of described vacuum casting (7) is handled through polishing for the surface.
3. the Vehicular liquefied rock gas liquid container of double-layer vacuum soldering according to claim 1 is characterized in that: be provided with heat insulation foam packed layer (9) between described vacuum casting (7) and the outer tank body (5).
CN 201010235644 2010-07-23 2010-07-23 Liquefied natural gas (LNG) storage tank for bilayer vacuum brazing vehicle Pending CN101943319A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102650369A (en) * 2012-05-25 2012-08-29 张家港韩中深冷科技有限公司 Liquefied natural gas filling pry
CN102705694A (en) * 2012-05-29 2012-10-03 张家港市科华化工装备制造有限公司 Refillable vertical movable gas cylinder
CN104722941A (en) * 2015-04-02 2015-06-24 芜湖三花制冷配件有限公司 Assembly method for small steel tube in air conditioner liquid storage device
CN104776311A (en) * 2014-03-18 2015-07-15 摩尔动力(北京)技术股份有限公司 Liquefied gas storage tank and application method thereof
CN105264279A (en) * 2013-06-19 2016-01-20 川崎重工业株式会社 Double-shelled tank and liquefied gas transport vessel
CN105308381A (en) * 2013-06-21 2016-02-03 川崎重工业株式会社 Liquefied gas-storing tank and liquefied gas transport vessel
CN105308382B (en) * 2013-06-19 2016-10-12 川崎重工业株式会社 Double-shelled storage tank and liquid gas carry vessel

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CN201753831U (en) * 2010-07-23 2011-03-02 高邮市荣清机械电子有限公司 Liquefied natural gas storage tank for double-layer vacuum soldering car

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EP0781958B1 (en) * 1995-11-30 2007-06-27 Air Liquide Deutschland GmbH Vacuum insulated cryogenic container
CN1151923A (en) * 1996-11-15 1997-06-18 上海交通大学 Braze welding technology for vacuum insulating utensils of stainless-steel
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102650369A (en) * 2012-05-25 2012-08-29 张家港韩中深冷科技有限公司 Liquefied natural gas filling pry
CN102705694A (en) * 2012-05-29 2012-10-03 张家港市科华化工装备制造有限公司 Refillable vertical movable gas cylinder
CN105264279A (en) * 2013-06-19 2016-01-20 川崎重工业株式会社 Double-shelled tank and liquefied gas transport vessel
CN105308382B (en) * 2013-06-19 2016-10-12 川崎重工业株式会社 Double-shelled storage tank and liquid gas carry vessel
CN105308381A (en) * 2013-06-21 2016-02-03 川崎重工业株式会社 Liquefied gas-storing tank and liquefied gas transport vessel
EP3012510A4 (en) * 2013-06-21 2017-02-22 Kawasaki Jukogyo Kabushiki Kaisha Liquefied gas-storing tank and liquefied gas transport vessel
CN105308381B (en) * 2013-06-21 2017-06-09 川崎重工业株式会社 Liquid gas keeps tank and liquid gas carry vessel
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CN104776311A (en) * 2014-03-18 2015-07-15 摩尔动力(北京)技术股份有限公司 Liquefied gas storage tank and application method thereof
CN104722941A (en) * 2015-04-02 2015-06-24 芜湖三花制冷配件有限公司 Assembly method for small steel tube in air conditioner liquid storage device

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Application publication date: 20110112