基于LNG冷能的发电技术

Power generation using LNG cold energy

液化天然气将成为人类在21世纪的主要能源之一。该文阐明了蕴涵在液化天然气中的巨大冷能利用价值,并指出两种利用方式:改善现有动力循环和相对独立的低温动力循环。前者主要体现在与燃气轮机及锅炉余热结合上,分析结果表明系统的热效率和火用效率普遍较高;后者则主要包括低温条件下的Rank ine循环、B rayton循环以及改进和复合的循环。总结了各种利用途径的特点和效果,同样说明了相当可观的液化天然气冷能利用价值。根据研究现状,最后指出了有待进一步研究和解决的诸多问题。

Liquefied natural gas （LNG） will be one of the main energy resources for human being in 21st century. This paper clarifies the huge cold energy of LNG in actual applications and indicates the two modes of LNG cold energy usages. One is to improve the current power cycles, and the other is the comparatively independent power cycles in cryogenics situations. The former mode is usually to combine with the gas turbine exit gas and the boiler excess heat and analysis result shows that all systems have the both higher thermal efficiency and exergy efficiency. The latter mode includes the Rankine cycle, Brayton cycle, improved and multiplex cycles. All of them show the worthy value of LNG cold energy. At last according to the current studies, the paper points out several unsolved questions, which demand to be studied in further.