超超临界二次再热机组节能优化探讨  

Discussion on Energy Saving Optimization of Supercritical Secondary Reheat Unit

作　　者：马魁元 MA Kui-yuan(Datang Northeast Electric Power Test Research Institute Co.,Ltd.)

机构地区：[1]大唐东北电力试验研究所有限公司,吉林长春130012

出　　处：《电站系统工程》2021年第1期63-64,68,共3页Power System Engineering

摘　　要：针对超超临界二次再热机组节能方向进行研究,通过合理的节能优化及对比方案设计,提高机组循环热效率,降低燃煤消耗,达到节能降耗的目的。从传统回热抽汽方案入手,通过设置冷却器、增加回热级数等方法设计出新方案,对不同的节能优化方案进行性能、投资等对比分析,最终确定最佳方案。经过一系列的研究设计表明,对于超超临界二次再热的机组,可以采取以下手段提高机组发电效率:一是增加外置式蒸汽冷却器,充分利用抽汽段的过热度;二是增加抽汽回热级数,合理分配各级焓降。经过上述节能优化改造技术,机组发电效率提升1.6%,供电煤耗降低6.6 g/kWh,取得不错的节能效果。It aimed at the secondary reheat ultra-supercritical unit to study the direction of energy saving, through comparing the design reasonable optimization and energy saving, improve the cycle thermal efficiency, reduce the coal consumption, achieve the goal of saving energy and reducing consumption. From the traditional heat extraction scheme,by setting the cooler, increase the heat series to design a new solution method, such as energy saving optimization scheme of different performance, investment, such as comparative analysis, finally to determine the best solution. Through the design of a series of studies show that for secondary reheat ultra-supercritical unit, can adopt the following means to improve the efficiency of generating units: one is to increase external steam cooler, make full use of the extraction period of heat;The second is to increase the steam recovery series and rationally distribute the enthalpy drops at all levels. After the above energy-saving optimization and transformation technology, the generating efficiency of the unit is increased by1.6%, and the coal consumption of power supply is reduced by 6.6 g/kWh, achieving a good energy-saving effect.

关 键 词：二次再热 热力系统 外置式蒸汽冷却器 回热级数优化 节能 

分 类 号：TK733[交通运输工程—轮机工程] TV734[动力工程及工程热物理—流体机械及工程]