摘要
国内二次再热机组存在变负荷时再热汽温欠温的情况,以某1 000 MW超超临界二次再热机组为例,通过增加烟气再循环系统来调节一次再热和二次再热蒸汽温度。利用电站仿真软件Ebsilon professional进行热力性能模拟分析,比较了从省煤器后和电除尘后2种烟气再循环方案,获得了2种方案下烟气再循环对各受热面烟温及汽温的影响情况,并确定烟气再循环量和提升一次和二次再热蒸汽温度关系。模拟结果表明:在50%THA工况及以下负荷投入烟气再循环系统后,可在过热汽温基本稳定的条件下,实现对一、二次再热汽温度的提升,最大可提升12℃。
The hot reheat steam temperature in most domestic double reheat units can hardly meet the design value during lower load. The steam temperature of the first reheat cycle and the second reheat cycle of a 1 000 MW ultra-supercritical double reheat unit can be increased by adding flue gas recirculation systems(FGR). By simulation software Ebsilon Professional the flue gas recirculation plans from the economizer outlet and ESP outlet are compared, and the effects on steam and flue gas temperatures of each heating surface by 2 plans are calculated, and the relationship between the flue gas recirculation quantity and steam temperature rise of the first reheat cycle and the second reheat cycle is determined. The simulation results show that the final reheat steam temperature can be increased significantly with flue gas recirculation systems under 50% THA and the below loads, the superheated steam temperature is stable, and the most increasing range is able to reach 12 ℃.
作者
庞力平
胡雍胜
李文学
段立强
杨勇平
PANG Liping;HU Yongsheng;LI Wenxue;DUAN Liqiang;YANG Yongping(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;Department of Security,Environment Protection and Supervision,China Energy Investment Co.,Ltd., Beijing 100022,China)
出处
《锅炉技术》
北大核心
2018年第6期1-7,共7页
Boiler Technology
基金
国家重点研发计划资助(2017YFB0602101)
关键词
二次再热
烟气再循环
再热汽温
低负荷
double reheat
flue gas recirculation
final reheat steam temperature
lower load
