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液化天然气冷能回收系统性能分析

发表时间:2017-10-31  浏览量:1488  下载量:180
全部作者: 王宪,王平,李佳星
作者单位: 大连理工大学能源与动力学院海洋能源利用与节能教育部重点实验室
摘 要: 以250℃的工业余热为热源,以液化天然气(liqufied natural gas,LNG)为冷源,利用Aspen plus软件模拟建立包含LNG直接膨胀和朗肯热力循环的联合朗肯循环。对R23、R290、R134a等8种有机纯工质进行比较和筛选,分析它们在循环中的比功、㶲效率和热效率等,发现R170、R290、R1270这3种工质在循环中的性能较好,又考虑到泵的安全性及㶲经济性,最终评价R290的综合性能最好。以R290为朗肯循环工质,以㶲损、㶲效率和热效率为评价指标,分析在不同最高循环压力、热源温度、热源流量、工质流量的情况下,联合循环的性能变化情况。最终确定了㶲效率最高的循环参数,分析其各流股的工况和各部件的㶲损,发现㶲损最大的部件是换热器设备,泵的㶲损相对最小。
关 键 词: 制冷与低温工程; 朗肯循环; 工质筛选; 循环效率
Title: Performance analysis of cold energy recovery system for liquefied natural gas
Author: WANG Xian, WANG Ping, LI Jiaxing
Organization: Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology,
Abstract: In this paper, the industrial waste heat of 250℃ was used as the heat source, and the liquefied natural gas (LNG) was used as the cold source. A joint Rankine cycle containing LNG direct expansion and Rankine thermal cycle was established by Aspen plus software simulation. Eight kinds of organic pure working materials such as R23, R290 and R134a were compared and screened, the specific work, exergy efficiency and thermal efficiency were analyzed in the cycle. The result shows that R170, R290 and R1270 have better performance in the cycle, and the final evaluation of R290 is the best by taking into account the safety of the pump and the exergy economy. With R290 as the Rankine cycle working fluid, the performance of the combined cycle is analyzed under the conditions of different maximum circulating pressure, heat source temperature, heat source flow and working fluid flow by taking the exergy destruction, exergy efficiency and thermal efficiency as the evaluation index. Finally, by determining the highest efficiency of the cycle parameters, analyzing of the flow of the current conditions and the exergy destruction of the components, we found that the largest component of the loss is the heat exchanger equipment, and the exergy destruction of pump is relatively minimal.
Key words: refrigeration and cryogenic engineering; Rankine cycle; screening of working fluid; cycle efficiency
发表期数: 2017年10月第20期
引用格式: 王宪,王平,李佳星. 液化天然气冷能回收系统性能分析[J]. 中国科技论文在线精品论文,2017,10(20):2237-2244.
 
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