Thermal economic analysis for adding low-temperature economizer in boilers

HAN Zhonghe; LI Peng

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Thermal economic analysis for adding low-temperature economizer in boilers

Thermal Power Generation Issue 5, (2016)

更新时间：2025-09-28

- Thermal economic analysis for adding low-temperature economizer in boilers
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK26
- Published Online：15 June 2016，
  
  Published：2016
- 稿件说明：
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HAN Zhonghe, LI Peng. Thermal economic analysis for adding low-temperature economizer in boilers[J]. Thermal Power Generation, 2016, (5).
DOI：

HAN Zhonghe, LI Peng. Thermal economic analysis for adding low-temperature economizer in boilers[J]. Thermal Power Generation, 2016, (5). DOI：

摘要

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

对降低锅炉排烟温度具有重要意义。加装低温省煤器后，烟气余热排挤汽轮机抽汽返回汽轮机继续膨胀做功

增加发电功率

降低汽轮机热耗率和机组发电煤耗率；同时导致汽轮机排汽量增大

凝汽器真空下降

凝结水量与烟气流动阻力增加

辅机功耗增加

机组热经济性变差。对此

本文以某超临界600 MW直接空冷机组TRL工况为例

考虑余热利用导致汽轮机相关级组的变工况运行特性

采用热平衡法对加装低温省煤器前、后机组热经济性进行计算分析。结果表明:虽然

加装低温省煤器后

汽轮机排汽压力升高1.62 kPa

辅机功耗增加293.854 kW；但综合各因素

加装低温省煤器后汽轮机热耗率降低25.711 kJ/(kW・h)

机组发电煤耗率降低0.960 g/(kW・h)

机组节能效果显著。

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