Analysis of a novel system for subcritical coal-fired power plants

LI Qinlun; WANG Lukai; LIU Yinhe; CHE Defu

doi:10.19666/j.rlfd.201711169

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Analysis of a novel system for subcritical coal-fired power plants

更新时间：2025-09-28

- Analysis of a novel system for subcritical coal-fired power plants
- Thermal Power Generation Vol. 47, Issue 8, Pages: 8-15(2018)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201711169
  CLC： TK115
- Published Online：02 August 2018，
  
  Published：2018
- 稿件说明：
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LI Qinlun, WANG Lukai, LIU Yinhe, et al. Analysis of a novel system for subcritical coal-fired power plants[J]. Thermal power generation, 2018, 47(8): 8-15.
DOI：

LI Qinlun, WANG Lukai, LIU Yinhe, et al. Analysis of a novel system for subcritical coal-fired power plants[J]. Thermal power generation, 2018, 47(8): 8-15. DOI： 10.19666/j.rlfd.201711169.

摘要

针对300 MW一次再热亚临界燃煤电站提出了一种新型热力系统方案(改进电站)

对其进行了热力学分析与技术经济性分析。在改进电站中

流经空气预热器后的烟气在烟气-凝结水预热器(FGCP)中被用来加热部分凝结水

空气在空气加热器(SAH)中经抽汽加热后进入空气预热器

其中

SAH与相应的回热加热器串联布置。调节FGCP中凝结水的流量

使其热容流率和烟气的热容流率保持相等

借此消除常规空气预热器中存在的温差夹点。结果表明:改进电站中锅炉排烟温度可以被降至烟气酸露点附近而不会产生低温腐蚀和堵灰;改进电站发电效率可达45.29%

相较常规电站提高了1.14百分点;改进电站的动态投资回收期约为4年

具有可行性。

Abstract

Thermodynamic analysis and techno-economic analysis are performed on a novel thermal system(modified power plant) for a 300 MW single reheat subcritical coal-fired power plant. In the modified power plant

all the flue gas from the air preheater is used to heat the partial condensate in flue gas-condensate preheater(FGCP)

air for combustion is preheated by extraction steam in steam-air preheaters(SAH)

which is arranged in series with the corresponding regenerative heater. In the FGCP

the flow rate of the condensate is adjusted to ensure that its heat-capacity flow rate is equivalent to that of the flue gas

thereby avoiding the pinch point of temperature difference in the conventional air preheater. The results show that the exit temperature of flue gas from boiler can be reduced to near the acid dew point of the flue gas without cold end corrosion and clog. And the power generation efficiency of the modified power plant can be improved by up to 45.29%

which is 1.14 percentage points higher than that of the conventional unit. The dynamic investment payback period of the modified power plant is about 4 years

which is feasible.

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