超超临界机组回热抽汽过热度的优化利用  

Optimized Utilization of Superheat of Extraction in Ultra-supercritical Units

作　　者：刘颖华 郜宁[2] 周璐瑶[3] 董伟[3] 徐钢[3] 

机构地区：[1]神华国华(北京)电力研究院有限公司 [2]国网新疆电力公司电力科学研究院 [3]华北电力大学

出　　处：《电站系统工程》2015年第4期16-18,25,共4页Power System Engineering

基　　金：国家自然科学基金项目(No.51476053)

摘　　要：针对大型超超临界机组热力系统回热抽汽过热度偏高的问题,分别研究了两种降低热力系统抽汽过热度的方法,即增设外置式蒸汽冷却器和采用回热式小汽轮机,并对这两种降低抽汽过热度的方法进行了全面的对比分析。基于典型超超临界机组,对两种抽汽过热度利用方案进行了详细的热力学计算分析,并在此基础上对两种方案开展技术经济性分析。研究结果表明:对于大型超超临界发电机组,外置式蒸汽冷却器系统和回热小汽机系统均能有效的降低抽汽过热度,提高机组发电效率;与外置式蒸汽冷却器方案相比,回热式小汽轮机方案的节能效果和经济收益均更为明显。The superheat of extraction in the thermodynamic system of ultra-supercritical unit is too high. In order to solve the problem, two schemes adding outer steam cooler and using regenerative turbine are analyzed comprehensively. Based on a typical ultra-supercritical unit, thermodynamic analysis and techno-economic analysis are conducted. The results show that, the two schemes can both reduce the extraction superheat effectively. Compared with the scheme of adding outer steam cooler, the energy saving effect and economic benefit of using regenerative turbine is better.

关 键 词：超超临界机组 抽汽过热度 外置式蒸汽冷却器 回热式小汽轮机 节能效果 

分 类 号：TM621[电气工程—电力系统及自动化]