利用LNG冷火用与工业余热的闭式Brayton循环热力分析.pdfVIP

第23 卷 第7 期 中 国 电 机 工 程 学 报 Vol.23 No.7 Jul. 2003 2003 年7 月 Proceedings of the CSEE ©2003 Chin.Soc.for Elec.Eng. 文章编号 0258-8013 (2003) 07-0173-05 中图分类号 TK472 文献标识码 A 学科分类号 48050 利用LNG 冷火用与工业余热的闭式 Brayton 循环热力分析 张 娜 刘蔚蔚 蔡睿贤 中国科学院工程热物理研究所 北京 100080 THERMODYNAMIC ANALYSIS OF CLOSED BRAYTON CYCLE WORKING ON LNG CRYOGENIC EXERGY AND WASTE HEAT UTILIZATION ZHANG Na, LIU Wei-wei, CAI Rui-xian (Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China) ABSTRACT Liquefied natural gas (LNG) has been utilized 况(横跨环境温度线上下的正热机循环) 下 该循环的实用 commercially in different parts of the world for a long time. In 主要自变数与常用的Brayton 循环不同 比后者多了两个 China, it is also decided to import LNG which is usually 并对不同自变数取为常数下的性能表达作了比较 最后建 supplied in a low temperature condition. It is necessary to 议应以循环最高温度与换热器节点温差为常数进行分析计 convert its cryogenic exergy into power to improve the 算 可以得出较为明确且实用的性能表达 文中最后还指 efficiency of energy utilization. For this sake, a feasible closed 出了对此工作继续发展的方向 Brayton cycle is proposed, in which the supercritical LNG is 关键词 液化天然气冷火用利用 余热利用 Brayton 循环 taken as its cold sink and an industrial waste heat as its heat 热力分析 source. A detailed thermodynamic analysis is given. It is found that the number of main independent parameters of the new 1 引言 cycle, an engine cycle with temperature closing the ambient 随着经济和环境协调发展的重要性日益为人 one, is practically different from common Brayton cycle. The 们所接受和认同,并进行了大量研究[1,2] 而且清洁 latter has only 2 such parameters,