液化天然气全容罐干燥置换氮气用量计算  

Calculation of Nitrogen Consumption for Drying and Purging of Liquefied Nature Gas Full Containment Tank

作　　者：贾保印[1] 宋媛玲[1] 李婵[1] 郑雪枫[1] 洪益娟[1] 

机构地区：[1]中国寰球工程公司,北京100012

出　　处：《煤气与热力》2015年第8期5-10,共6页Gas & Heat

摘　　要：LNG全容罐投入运行前需进行氮气干燥置换,以保证气相空间的水露点及氧体积分数达到规定指标要求。利用微积分对氮气干燥置换过程进行计算,建立氧体积分数及水露点随干燥置换时间变化的模型,计算出干燥置换时间及相应氮气用量。将模型应用于16×(10)~4m^3的LNG储罐氮气用量计算,实际氮气用量比理论计算值多17%,实际干燥置换时间比理论计算值多4d。LNG full containment tank shall be dried and purged with nitrogen before operation to ensure that the moisture dew point and oxygen volume fraction in the gas space meet the requirements. The nitrogen drying and purging process is calculated by calculus. The model that the moisture dew point and oxygen volume fraction vary with drying and purging time is made. The drying and purging time and the corresponding nitrogen consumption have been calculated. The model is used in calculation of nitrogen consumption in 16×10^4m^3 LNG tank. The actual nitrogen consumption is 17% more than the theoretical calculation value, and the actual drying and purging time is 4 d longer than the theoretical calculation value.

关 键 词：全容罐 干燥 置换 液化天然气储罐 氮气用量 干燥置换时间 

分 类 号：TE821[石油与天然气工程—油气储运工程]