With carbon peaking & carbon neutrality goal and vision,the methane(CH4)emissions from natural gas systems are receiving increasing attention.For the storage & transportation of liquefied natural gas(LNG)tank containers,the emission and conventional treat-ment measures of LNG boil-off gas(BOG)were explained.The cryogenic and cold heat exergy characteristics of LNG and its boil-off gas,as well as the physicochemical and storage characteristics of gas hydrates,were analyzed.The availability of LNG and its boil-off gas cold energy and the accessibility of BOG hydrate storage and transportation were studied,and a process route combining cold energy utilization technology and gas hydrate technology for recovering BOG of LNG tank containers was proposed.The research shows that the high-grade cold energy contained in the over-pressure relief BOG of LNG tank containers can be applied to the generation and the stor-age & transportation of solid gas hydrate formed by BOG itself with water and additives,so as to realize the zero emission of BOG and the cascade utilization of BOG cold energy.It is beneficial to energy saving,pollution reduction and carbon emission reduction,as well as cost reduction,quality improvement and efficiency increase.The research results can provide reference for the BOG recovery and uti-lization of refrigerated liquefied gas tank containers and road tankers.
LNG tank containerBOG recoverycold energy utilization technologygas hydrate technologycollaborative innovation
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NSTL
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