超超临界机组采用MC系统的变工况性能研究  

Off-design performance of an ultra-supercritical power unit applying MC system

作　　者：阚伟民[1] 宋景慧[1] 周璐瑶[2] 赵世飞[2] 徐钢[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热力发电》2014年第7期41-44,共4页Thermal Power Generation

基　　金：广东电网公司电力科学研究院科研项目(kh3826);国家自然科学基金联合基金项目(U1261210)

摘　　要：基于常规超超临界机组热力系统(常规系统),提出了取消中压缸抽汽,引入回热式小汽轮机抽汽的主循环(MC)系统的设计方案。以某超超临界1 000MW机组为例,利用EBSILION软件对常规系统和MC系统进行机组变工况下热力学计算分析和比较。结果表明:采用MC系统的机组,在设计工况下,机组发电效率比常规系统提高0.15%,发电煤耗降低0.92g/(kW·h);在30%负荷下,机组发电效率比常规系统提高0.24%,发电煤耗降低1.61g/(kW·h)。因此,采用MC系统的超超临界机组具有良好的变负荷特性,且更适合于低负荷工况下的高效经济运行。On the basis of thermal system in conventional ultra-supercritical power generation units,a design scheme for a master cycle （MC）system was proposed.In this scheme,the steam extraction from the intermediate pressure （IP）cylinder is replaced by extracting steam from an added regenerative small steam turbine.Taking an ultra-supercritical 1 000 MW unit as the example, the EBSILION software was applied to conduct thermodynamic and economic analysis for the conventional system and MC system under different working conditions.The results show that：the power generation efficiency of the unit applying the MC system is 0.15% and 0.24% higher than that using the conventional system,and the coal consumption rate is 0.92 g/（kW·h）and 1.61 g/（kW·h）lower,under design condition and 30% load condition,respectively.Thus,the ultra-supercritical unit employing MC system is more suitable to work under low-load working conditions.

关 键 词：超超临界 1 000MW机组 常规系统 MC系统 热经济性 变工况 

分 类 号：TK284.1[动力工程及工程热物理—动力机械及工程]