超临界朗肯循环热力性能研究  

Study of the Thermodynamic Performance of a Supercritical Rankine Cycle

作　　者：张鑫[1] 赵贤聪[1] 苍大强[1] 王景富[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]中国船舶重工集团公司第七〇三研究所,黑龙江哈尔滨150036

出　　处：《热能动力工程》2015年第2期228-232,319,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：对140℃以下的低温工业余热进行了回收利用,从热力学第一定律和第二定律的角度对超临界朗肯循环的系统性能进行了分析。以R22、R115、R134a、R125及CO25种工质为研究对象,对超临界朗肯循环的输出净功率、吸热量、热效率、火用损失和火用效率等参数进行了计算。结果表明:当透平进口压力较低时(8-11 MPa),采用有机工质R22综合性能最好;当透平进口压力较高时(11-26 MPa),以超临界CO2为工质综合性能最好。With a view to recovering and utilizing the low temperature waste heat below 140 ℃,from the viewpoint of the first and second law of thermodynamics,the authors conducted an analysis of the performance of a supercritical Rankine cycle system. With five kinds of working medium( R22,R115,R134 a,R125 and CO2) serving as the object of study,the authors also calculated such parameters as the net output power,amount of heat absorbed,thermal efficiency,exergy loss and efficiency etc. The calculation results show that when the pressure at the inlet of the turbine is relatively low( 8- 11 MPa),the comprehensive performance of the system is the best when organic working medium R22 is used. When the pressure at the inlet of the turbine is relatively high( 11- 26 MPa),the comprehensive performance of the system is the best when organic working medium CO2 in its supercritical state is used.

关 键 词：低温余热 超临界朗肯循环 热力性能 工质 

分 类 号：TK11[动力工程及工程热物理—热能工程]