液化天然气加气站管道热力分析

Thermal Analysis on Pipeline of Liquefied Natural Gas Automobile Filling Stations

对液化天然气加气站管道内部低温液化天然气与环境空气间的传热过程进行了分析,提出了加气站管道冷能损失量的计算方法。通过编程对加气站日气化量进行迭代求解,分析了管道冷量损失的部分影响因素。结果表明,管道内部的液化天然气温度对整个加气站的冷能损失影响不大,故管道内部的液化天然气可以维持比较低的温度而不会产生较大的冷能损失;保温层厚度对加气站冷能损失的影响最明显,但保温层厚度的选取需要同时考虑保温效果和经济性两个方面;环境温度的改变对加气站的冷能损失影响也比较明显,夏天的冷量损失要比冬天的冷量损失高出28.2%左右。

The heat transfer processing of pipeline between low temperature liquefied natural gas and ambient air in liquefied natural gas station was studied and a calculation method for pipeline cold energy loss was put forward.Equivalent amount of gasification in liquefied natural gas stations was calculated by writing iterator,and some influencing factors of cold mass loss were analyzed.The predicted results showed that the temperature of liquefied natural gas had little influence on cold energy loss of the liquefied natural gas stations,so liquefied natural gas could keep a lower temperature without more cold energy loss.Insulation thickness had a significant effect on cold energy loss,but the thickness of insulation should be considered on both thermal insulation effect and economical efficiency.The changing of the environment temperature had certain effect on cold energy loss,which predicted that cold energy loss in summer was one-third higher than that in winter.