|Analysis of Temperature and Pressure Changes in Liquefied Natural Gas (LNG) Cryogenic Tanks|
|Chen QS(陈启生); Wegrzyn J; Prasad V; Wegrzyn, J (reprint author), Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA.
|摘要||Liquefied natural gas (LNG) is being developed as a transportation fuel for heavy vehicles such as trucks and transit buses, to
lessen the dependency on oil and to reduce greenhouse gas emissions. The LNG stations are properly designed to prevent the venting
of natural gas (NG) from LNG tanks, which can cause evaporative greenhouse gas emissions and result in fluctuations of fuel flow
and changes of fuel composition. Boil-off is caused by the heat added into the LNG fuel during the storage and fueling. Heat can
leak into the LNG fuel through the shell of tank during the storage and through hoses and dispensers during the fueling. Gas from
tanks onboard vehicles, when returned to LNG tanks, can add additional heat into the LNG fuel. A thermodynamic and heat
transfer model has been developed to analyze different mechanisms of heat leak into the LNG fuel. The evolving of properties and
compositions of LNG fuel inside LNG tanks is simulated. The effect of a number of buses fueled each day on the possible total fuel
loss rate has been analyzed. It is found that by increasing the number of buses, fueled each day, the total fuel loss rate can be reduced
significantly. It is proposed that an electric generator be used to consume the boil-off gas or a liquefier be used to re-liquefy the boiloff
gas to reduce the tank pressure and eliminate fuel losses. These approaches can prevent boil-off of natural gas emissions, and
reduce the costs of LNG as transportation fuel.|
; Physics, Applied
|通讯作者||Wegrzyn, J (reprint author), Brookhaven Natl Lab, Energy Sci & Technol Dept, Upton, NY 11973 USA.|
Chen QS,Wegrzyn J,Prasad V,et al. Analysis of Temperature and Pressure Changes in Liquefied Natural Gas (LNG) Cryogenic Tanks[J]. Cryogenics,2004,44(10):701-709.
陈启生,Wegrzyn J,Prasad V,&Wegrzyn, J .(2004).Analysis of Temperature and Pressure Changes in Liquefied Natural Gas (LNG) Cryogenic Tanks.Cryogenics,44(10),701-709.
陈启生,et al."Analysis of Temperature and Pressure Changes in Liquefied Natural Gas (LNG) Cryogenic Tanks".Cryogenics 44.10(2004):701-709.