关键词: 液化天然气, 冷能利用, ?, 相变, 回收

Abstract: As an energy source,liquefied natural gas (LNG) has the advantages of clean and efficient. The vaporization of LNG releases a large number of cold energy,which has great economic value and environmental value. But it is a common problem that LNG cold energy utilization rate is low. This paper presents various ways of the LNG cold energy utilization,compares the advantages and disadvantages and cooling energy requirements among them,and dicusses the prospects for their utilization and environmental values. LNG cold energy utilization technology development and the research progress are also introduced. To solve the problem of low utilization rate,suggestions of taking advantage of the principle of temperature counterpart and cascade utilization,developing accumulation and cold energy storage device as well as developing new refrigerating medium,are proposed. The choice of cold energy projects should be based on the availability of local conditions and new forms of cold energy utilization need to be developed.

Key words: liquefied natural gas (LNG), cold energy utilization, exergy, phase change, recovery