福州大学学报（自然科学版）2017，Vol.45Issue(5)：699-705,7.DOI:10.7631/issn.1000-2243.2017.05.0699
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
Working fluid selection and parameter analysis of combined transcritical power generation system using LNG as the cold source
摘要
Abstract
In order to improve the utilization efficiency of the LNG cold energy,a transcritical organic Rankine-Brayton combined cycle was proposed in this paper which using LNG as the cold source.10 working fluids were selected based on the thermotphysical properties and safety level of the working fluids.Parametric analysis was performed to study the effects of key factors on mass flow rate,turbine power outputs,thermal efficiency and exergy efficiency.Results show that increasing the turbine inlet pressure and temperature or decreasing the condensation temperature will rises system exergy efficiency greatly.Under the given operating conditions,the higher critical temperature of working fluid,the better the system performance we will get.In this paper,R245fa could achieve the best thermal efficiency and exergy efficiency of 53.07％ and 33.59％,respectively.Condenser accounts for the largest part of exergy destruction.Hence,reducing the exergy destruction in condenser is the most effective way to improve the exergy efficiency.关键词
LNG冷能/有机朗肯循环/联合循环/工质选择/参数优化Key words
LNG cold energy/organic Rankine cycle/combined cycle/working fluid selection/parameter optimization分类
能源科技引用本文复制引用
王峰,孙志新,许福泉,王蜀家..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[J].福州大学学报（自然科学版）,2017,45(5):699-705,7.基金项目
国家自然科学基金资助项目(51406037) （51406037）
