一种超超临界二次再热发电系统及其热经济性分析  

Thermal Economic Analysis of a Double Reheat Ultra Supercritical Pressure Unit

作　　者：谷雅秀[1] 王生鹏[2] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]西安热工研究院有限公司,陕西西安710032

出　　处：《西安理工大学学报》2013年第3期357-361,共5页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51106014);陕西省自然科学基础研究计划基金资助项目(2012JQ7022);西安市建设科技计划基金资助项目(SJW201204)

摘　　要：超超临界二次再热发电技术是提高电厂燃煤机组发电效率的重要技术方向。通过朗肯循环与理想再热循环循环效率的计算比较,理想一次再热循环可比朗肯循环效率提高1.96个百分点,采用理想二次再热循环可比朗肯循环效率提高3.27个百分点。针对一种蒸汽参数为31MPa/600℃/620℃/620℃的1000 MW超超临界二次再热机组的热力系统方案,进行了机组热经济性分析与计算,并与蒸汽参数为26.25MPa/600℃/600℃的一次再热机组进行了经济性计算对比。通过热平衡计算,二次再热机组相对于一次再热的超超临界机组可降低供电煤耗率约9.22 g/(kW·h),热耗率降低了3.34%,机组净效率提高了约1.54个百分点。节能与环保效益显著。Double reheat ultra supercritical power generation technology is an important technology to en- hance the efficiency of electricity generation in coal-fired power plant. By comparing the cycle efficiency of ideal reheat cycle with that of Rankine Cycle, the ideal single reheat technology can increase the cycle efficiency about 1.96%, while the ideal double reheat technology can increase the cycle efficiency about 3.27%. The thermal economy of a 31MPa/600~C/620~C/620~C 1000 MW double reheat ultra supercrit- ical pressure unit was analyzed and calculated. Compared with a 26.25 MPaf600~C/600~C 1000 MW ul- tra supercritical pressure unit with single reheat, the net coal consumption of the 1000 MW double reheat ultra supercrifical pressure unit decreases 9.22 g/（kW h）, the heat rate decreases 3.34%, and the net efficiency increases 1.54%. It has promising energy-saving performance and environmental protection benefit.

关 键 词：超超临界机组 二次再热 热耗率 

分 类 号：TK212.4[动力工程及工程热物理—动力机械及工程] TK262