以LNG为冷源的跨临界有机工质联合循环发电系统工质选择与参数分析

发布时间：2018-03-10 10:44

本文选题：LNG冷能　切入点：有机朗肯循环　出处：《福州大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：为提高液化天然气的利用效率,构建以液化天然气为冷源的跨临界有机朗肯循环-布雷顿循环联合发电系统.综合考虑工质的热物性和安全性等因素,筛选出10种综合性能较好的有机工质进行分析,并研究关键热力参数对工质流量、蒸汽轮机输出功、热效率和火用效率的影响.结果表明:提高蒸汽轮机入口压力和温度,降低冷凝温度可提高系统的火用效率;在给定运行工况下,工质临界温度越高,则系统性能越好;具有最高临界温度的有机工质R245fa的综合性能最好,系统的热效率和火用效率分别可达到53.07%和33.59%;冷凝器的火用损失占系统总火用损失的主要部分,因此减少该部件的不可逆损失是提高系统能量利用效率的关键.
[Abstract]:In order to improve the utilization efficiency of liquefied natural gas (LNG), a transcritical organic Rankine cycle and Brayton cycle combined power generation system with liquefied natural gas (LNG) as a cold source was constructed. Ten organic working fluids with better comprehensive performance were selected for analysis, and the effects of key thermodynamic parameters on the working fluid flow, steam turbine output power, thermal efficiency and exergy efficiency were studied. The results showed that the inlet pressure and temperature of steam turbine were increased. Lowering the condensation temperature can improve the exergy efficiency of the system; the higher the critical temperature of the working fluid, the better the performance of the system; and the best comprehensive performance of the organic working fluid R245fa with the highest critical temperature. The heat efficiency and exergy efficiency of the system can reach 53.07% and 33.59.The exergy loss of the condenser accounts for the main part of the total exergy loss of the system, so reducing the irreversible loss of the unit is the key to improve the energy utilization efficiency of the system.
【作者单位】：福州大学石油化工学院;福建雪人股份有限公司;
【基金】：国家自然科学基金资助项目(51406037)
【分类号】：TM619

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