1000MW火电机组热力系统改进热经济性分析  

Thermal Efficiency Analysis of Thermal Improvement of 1 000MW Thermal Power Generating Unit

作　　者：吴凯槟[1] 杨江山 彭旭东[1] 朱振辉[1] 李海周[1] 

机构地区：[1]国网电力科学研究院 [2]94675部队

出　　处：《汽轮机技术》2013年第1期65-68,共4页Turbine Technology

摘　　要：为了提高火电厂的发电热效率,降低冷端余热热污染,应对火电厂中的汽轮机乏汽热量进行回收利用。现在以N1030-26.25/600/600为例:对该机组热力循环系统进行改进,加入有机工质循环;利用其自身的热力特性,使有机工质吸收机组凝汽器中水蒸汽中的汽化潜热;成为有一定压力和温度的过热蒸汽,再进入低压缸做功。经过热经济性计算,结果显示:在THA、75%THA、50%THA工况下,采用甲苯、R365MFC、正戊烷3种有机工质,在机组总热耗、机组排汽温度与原机组相同的情况下,新系统的冷端热量减少,发电热效率得到了提高;采用新系统可以使机组热经济性提高;其中工质R365MFC环保性好,发电热效率高,排汽压力合适,为新系统最适合的有机工质。In order to improve the generation thermal efficiency of thermal power plant and reduce the thermal pollution of cold -side heat, the heat of exhaust steam in a power plant turbine should be recycled. Now taking the N1030 -26.25/ 600/600 for example ： the original unit＇ s thermal recycle is improved by a added organic fluid cycle ; by its thermodynamic properties, the organic fluid could get latent heat from water vapor; at certain pressure and temperature, the organic fluid could reach superheat state, then acting in the lp cylinder. After a thermal economic calculation, the results show：at THA, 75% THA and 50% THA,with three organic fluids of toluene ,R365MFC and pentane, and with the same heat consumption and exhaust temperature of the original unit. After improvement, the cold-side heat reduces, thermal efficiency of the new generating unit raises; Therefore, the improved system can improve the unit＇s thermal economy; R365MFC is more environmental among the organic fluids, and it could get higher thermal efficiency, and also its exhaust pressure is more suitable, so it is the most suitable organic fluid for the new system.

关 键 词：余热 有机工质 改进系统 热经济性 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]