一种适用于车载LNG低温绝热气瓶漏热量测量的方法研究  

A new method to evaluate heat leakage of cryogenic vessel for LNG buses

作　　者：李正清[1] 杨生胜[1] 朱建炳[1] 李小金[1] 李晓霞 马敏 Li Zhengqing;Yang Shengsheng;Zhu Jianbing;Li Xiaojin;Li Xiaoxia;Ma Min(Lanzhou Institute of Physics, Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所,兰州730000

出　　处：《低温工程》2020年第5期60-64,共5页Cryogenics

摘　　要：车载LNG低温绝热气瓶需要定期进行日蒸发率或漏热量的测量。现阶段主要是依据标准方法进行测量,测量的热平衡过程中排气阀门完全打开,排放大量气体,对于车载LNG气瓶,排放气体会形成危险源,并造成气体浪费,同时完成整个测量需要72 h以上。针对该问题,提出在自增压过程对车载LNG气瓶漏热量进行测量的方法,建立气瓶自增压过程的热力学模型,并进行热力学分析。根据分析建立系统的能量方程,确定自增压测量过程中漏热量与气瓶测量参数间的数学关系。在理论分析的基础上建立相应的测试系统,对测量方法进行实验验证,实验表明,自增压方法测量的结果较为准确的反映了气瓶的漏热量,相对于现行标准方法误差在10%以内,并且可以在6 h内完成测量。Cryogenic vessel of LNG buses is the special equipment that requires to measure the static evaporation rate or heat leakage periodically.At present,the measurement is main carried out based on the standard method.In test process of equilibrium,the exhaust valve is fully opened and a large amount of gas is discharged.For cryogenic vessel of LNG buses,the discharged gas may form a source of risk and is wasted,meanwhile it takes more than 72 hours to finish the test.To solve this problem,a new method was proposed to measure the heat leakage of cryogenic vessel of LNG buses in self-pressurization.The heat transfer model was built and thermodymic analysis was carriedout.The relationship between the heat leakage and the test parameters of cryogenic vessel in the process of self-pressurization measurement is determined.On the basis of theoretical analysis the test system was established and the experiment was completed to verify the method.The results indicated that the new method was useful and the error was less than 10%compared with the current standard method,in addition,and the measurement could be completed in 6 h.

关 键 词：LNG 低温绝热气瓶 漏热量 自增压 测量方法 

分 类 号：TB657[一般工业技术—制冷工程]