化工进展 ›› 2015, Vol. 34 ›› Issue (11): 4114-4119.DOI: 10.16085/j.issn.1000-6613.2015.11.047

• 应用技术 • 上一篇    下一篇

低温省煤器对凝汽器真空及机组热经济性影响

韩中合, 李鹏   

  1. 华北电力大学电站设备状态监测与控制教育部重点实验室, 河北 保定 071003
  • 收稿日期:2015-04-13 修回日期:2015-05-13 出版日期:2015-11-05 发布日期:2015-11-05
  • 通讯作者: 韩中合(1964—),男,教授,博士生导师,研究方向为热力设备状态监测与故障诊断、两相流计算与测量、叶轮机械CFD与优化设计研究。E-mailhan_zhonghe@163.com。
  • 作者简介:韩中合(1964—),男,教授,博士生导师,研究方向为热力设备状态监测与故障诊断、两相流计算与测量、叶轮机械CFD与优化设计研究。E-mailhan_zhonghe@163.com。
  • 基金资助:
    国家自然科学基金(51306059)及中央高校基本科研业务费专项资金(2014ZD34)项目。

Impacts of adding low-temperature economizer on condenser vacuum and thermal economic

HAN Zhonghe, LI Peng   

  1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Baoding 071003, Hebei, China
  • Received:2015-04-13 Revised:2015-05-13 Online:2015-11-05 Published:2015-11-05

摘要: 为解决国内某电厂600MW直接空冷机组5#锅炉排烟温度过高的问题,在锅炉尾部烟道加装低温省煤器,利用烟气余热加热机组凝结水。抽汽被排挤回汽轮机继续膨胀做功,增加汽轮机发电功率,降低汽轮机热耗和机组发电煤耗;同时汽轮机排汽量增加,凝汽器真空下降,机组热经济性变差。本文以TRL工况为例,对该电厂加装低温省煤器后进行了计算,得出凝汽器真空下降1.617kPa。利用热平衡法与等效焓降法,对加装低温省煤器后机组热经济性进行计算。最终结果为:热平衡法得到加装低温省煤器后汽轮机热耗下降25.711kJ/(kW·h),机组发电煤耗降低0.959g/(kW·h);等效焓降法得到,加装低温省煤器后汽轮机热耗下降26.832kJ/(kW·h),机组发电煤耗降低1.001g/(kW·h)。说明加装低温省煤器具有良好的节能效果,同时也证明了等效焓降法与常规热平衡法的一致性。

关键词: 低温省煤器, 凝汽器真空, 热平衡法, 等效焓降法, 热耗, 发电煤耗

Abstract: In order to solve the overheating problem of the 5# boiler exhaust gas for the direct air cooling 600 MW unit in a power plant, this paper proposed the technical solution by installing low-temperature economizer. Flue gas heat was used to heat the condensed water in this process. Extraction steam was routed back to the steam turbine to continue expanding, the power of steam turbine was increased, the turbine heat rate and the gross coal consumption rate were decreased. Condenser vacuum fell by1.617kPa after low-temperature economizer was added. Using the habitual thermal balance method and equivalent enthalpy drop method, the thermal economic of the designs was evaluated. The habitual thermal balance method's results indicated that after the low-temperature economizer was added, the heat rate decreased by 25.711kJ/(kW·h) , the gross coal consumption reduced by 0.959g/(kW·h);and the equivalent enthalpy drop method's results indicated that the low-temperature economizer made turbine heat rate decrease by 26.832kJ/(kW·h) and reduced the gross coal consumption by 1.001g/(kW·h). That adding low-temperature economizer achieved good energy saving results. Also proved that the consistency of the equivalent enthalpy drop method and the habitual thermal balance method.

Key words: low-temperature economizer, condenser vacuum, habitual thermal balance method, equivalent enthalpy drop method, heat rate, gross coal consumption

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn