Comparison of thermal economy of waste heat utilization approaches of low-rank coal-fired power plant

XU Hongyu; XU Cheng

doi:10.19666/j.rlfd.201904102

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Comparison of thermal economy of waste heat utilization approaches of low-rank coal-fired power plant

更新时间：2025-09-28

- Comparison of thermal economy of waste heat utilization approaches of low-rank coal-fired power plant
- Thermal Power Generation Vol. 49, Issue 2, Pages: 17-23(2020)
- 作者机构：
  
  华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201904102
  CLC： TM11+5
- Published Online：15 January 2020，
  
  Published：2020
- 稿件说明：
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XU Hongyu, XU Cheng. Comparison of thermal economy of waste heat utilization approaches of low-rank coal-fired power plant[J]. Thermal power generation, 2020, 49(2): 17-23.
DOI：

XU Hongyu, XU Cheng. Comparison of thermal economy of waste heat utilization approaches of low-rank coal-fired power plant[J]. Thermal power generation, 2020, 49(2): 17-23. DOI： 10.19666/j.rlfd.201904102.

摘要

烟气余热利用对提高燃煤电站的综合能效具有重要意义。本文以某燃用中高水分的超临界600 MW凝汽式机组为例

分析比对了利用低温省煤器加热回水和利用烟气滚筒干燥设备干燥入炉煤这2种烟气余热利用系统进行热力学计算对比;在此基础上

对这2种烟气余热回收机理进行了分析

并对2个系统的经济性进行了探讨。结果表明:以案例机组为例

通过烟气余热利用将排烟温度从130℃降低到95℃

低温省煤器方案和预干燥原煤方案机组功率分别增加3.14 MW和10.85 MW

年均净发电收益分别增加464.34万元和1 401.1万元

利用烟气余热干燥入炉煤体现出较好的热经济性。

Abstract

Flue gas waste heat utilization is of great significance to the improvement of comprehensive energy efficiency of coal-fired power plants. By taking a supercritical condensing unit firing coal with high and medium moisture fraction as an example

this study carried out thermodynamic calculation for two approaches recovering the waste heat of flue gas

namely using low temperature economizer to heat the return water and using flue gas cylinder drying device to heat the input coal. On this basis

the waste heat recovering mechanism of the above two approaches was analyzed

and the economic efficiency of them was discussed. The results show that

by utilizing waste heat of flue gas

the exhaust gas temperature reduces from 130 ℃ to 95 ℃

and the additional electric power output of these two flue gas waste heat utilization systems increases by 3.14 MW and 10.85 MW

respectively

and the net annual benefit increases by 4.643 4×106 yuan and 1.401 1×107 yuan

respectively. Using the flue gas to heat the input coal has higher economic efficiency.

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