1000MW二次再热汽轮机带外置蒸冷器方案能损分析  

Heat Consumption Analysis for the 1000MW Double-reheat Steam Turbine with External Steam Coolers

作　　者：夏晓华 杨宇[2] 范世望 彭泽瑛 杨建道 

机构地区：[1]上海汽轮机厂有限公司,上海200240 [2]上海发电设备成套设计研究院,上海200240

出　　处：《发电设备》2015年第3期160-163,共4页Power Equipment

基　　金：上海市科学技术委员会科技项目资助(13DZ1101502)

摘　　要：外置蒸汽冷却器在高参数大容量再热机组中能充分利用回热抽汽的过热度,同时提高给水温度,从而提高循环效率。针对某1 000 MW二次再热项目,采用能级效率法对其带两级外置蒸汽冷却器方案的THA、TMCR、VWO、75%THA、50%THA等五个工况进行了能损分析,并与其常规方案的能损进行了比较。结果表明:带外置蒸汽冷却器方案热耗的收益主要来自辅汽能损部分,且两级外置蒸汽冷却器能降低600℃热力系统热耗约27kJ/(kW·h)。External steam coolers are widely used in large-capacity high-parameters reheat unit, due to their capability in recovering the superheat degree of regenerative steam and raising the temperature of feed water, thus improving the cycle efficiency. In this paper, an energy consumption analysis was carried out to a 1 000 MW double-reheat turbine with external steam coolers under THA, TMCR, VWO, 75%THA and 50%THA working conditions based on energy level efficiency method, and the results were compared with those of conventional schemes. Results show that the scheme with external steam coolers mainly reduces the heat consumption in auxiliary section, and in a 600℃ thermal system with two external coolers, the heat consumption may be reduced by about 27 kJ/（kW-h）.

关 键 词：汽轮机 二次再热 外置蒸汽冷却器 能级效率 能损比较 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]