BOG气体回收技术及经济效益分析

Recovery Technology of Boil Off Gas(BOG) and Analysis of Its Economic Benefit

液化天然气(LNG)是一种清洁高效的能源,与汽油、柴油及压缩天然气(CNG)相比,具有安全性高、经济性强、环境负效应小、储能密度高等明显优势。随着LNG加气站的陆续发展,LNG蒸发气体(BOG)产生量过大,会引起储罐等设备压力升高,将BOG排放到空气中不仅是一种无谓的浪费,而且可燃气体排放到空气中,具有潜在的危险。此外,BOG中主要成分为甲烷,而甲烷是一种温室效应很强的气体,其温室效应系数(GWP)为二氧化碳的21倍。因此,有必要分析BOG产生原因、计算BOG气量,并采取合理的抑制和处理措施进行BOG回收,这不仅符合节能减排的方针政策,也是提高LNG装置的经济性、安全性、环保性的重要措施。

Liquefied natural gas （LNG）is a clean and efficient energy, compared with gasoline, diesel and compressed natural gas（CNG）, it has the obvious advantages of high security, high economy, little negative environmental effect and high energy storage density. With the development of LNG filling stations, the excessive BOG of LNG will cause the pressure of tank and other equipment to rise, to dis- charge BOG into the air is not only a waste but also potential danger. In addition, the main component of BOG is methane, and methane is a very strong greenhouse effect gas, its greenhouse effect coefficient of 21 times of carbon dioxide. Therefore, it is necessary to analyze the causes of BOG generation, calculate the amount of BOG, and take reasonable measures to restrain and recycle the BOG, which is not only in line with the policy of energy conservation and emission reduction, but also can improve the economy, safety and environmental protection of LNG devices.