混合制冷剂液化天然气过程的有效能分析.pdf

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化工.进展
2604
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2013年第32卷第11期
研究开发
混合制冷剂液化天然气过程的有效能分析
王春燕,邵方元,朱新,张彩珠,魏顺安
重庆大学化学化工学院,重庆400044)
摘要:采用 Aspen Plus化エ模拟软件对混合制冷荆液化天然气过程进行全流程的模叔拟计算,并对各个单元设
各进行有效能分析。结果表明:压缩机的有效能损失占整个流程有效能损失的63.8%,换热过程占19%,是流程
中的节能重点。在流程模拟的基础上,以高压制冷剂的压力和温度、低压制冷剂的压力和温度及混合制冷剂中
甲烷与正戊烷的摩尔含量为可变因素,分析了这些因素对各设备有效能损失的影响,找出相应的影响规律,并
提出了相应的降低体系有效能损失的措施与建议,对整个工艺过程的节能降耗具有一定的指导作用。结果表明:
提高高压制冷剂的压カ、低压制冷剂的压力与温度和混合制冷剂中正成烷的含量,以及降低高压制冷剂的温度
与混合制冷剂中甲烷含量的含量,有助于降低整个流程的有效能损失。
关键词:天然气液化; Aspen Plus;能量分析;有效能损失
中图分类号:TE08
文献标志码:A
文章编号:1000-6613(2013)11-2604-06
DOI:10.3969/jiss.1000-6613.2013.11013
Exergy analysis of mixed refrigerant liquefaction natural gas process
WANG Chunyan, SHAO Fangyuan, ZHU in, ZHANG Caizhu, WEI Shun an
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China)
Abstract: This paper presented a simulation of liquefied natural gas process of the mixed refrigerant
cycle using Aspen Plus software, and calculated the exergy losses of each unit. The results showed that
the exergy loss of compression process was 63.8% of all energy loss, heat transfer process accounted
for 19% of the energy loss, but was the key point to reduce the exergy loss in the entire process. On the
basis of the process simulation, the pressure and temperature of high-pressure refrigerant, low-pressure
refrigerant, and the molar content of methane and n-pentane in the mixed refrigerants were selected as
the variables in the detailed analysis of the impacts on the exergy losses. Suggestions were proposed to
reduce the system effective loss. The analysis results showed that improving the high-pressure
refrigerant pressure, low-pressure refrigerant pressure and temperature, and the molar content of the
n-pentane in the mixed refrigerants could help reduce the exergy loss of the entire process. Reducing
the high-pressure refrigerant temperature and the molar content of the methane in the mixed refrigerant
process had similar effects
Key words: liquefied natural gas(LNG); Aspen Plus; energy analysis; exergy loss
天然气、煤炭、石油为世界三大能源。能源是己成为天然气利用中的一项重大先进技术山,发展
支撑国民经济,保证社会发展的重要物资。随着国成为一门新兴工业,并正在继续迅猛发展。发展液
民经济的快速增长,我国对能源的需求将不断增加
原油资源日益枯竭且价格居高不下,但天然气作为收稿日期:2013-05-14:修改稿日期:20130607
种清洁、高效能源,是石油的最好替代产品。如
第一作者:王春燕(1988一),女,硕土研究生,研究方向为化工设计
与模拟。联系人:魏顺安,博士,副教授,从事化学工程研究。E-mail
今,天然气液化技术( liquefied natural gas,LNG) wsacn(ale63com