Study on energy-saving effect of bypass waste heat utilization system of air preheater in a 1 000 MW unit boiler

WANG Chunchang; MA Jianmin; ZHANG Yubo; YANG Hui

doi:10.19666/j.rlfd.201904144

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Study on energy-saving effect of bypass waste heat utilization system of air preheater in a 1 000 MW unit boiler

更新时间：2025-09-28

- Study on energy-saving effect of bypass waste heat utilization system of air preheater in a 1 000 MW unit boiler
- Thermal Power Generation Vol. 48, Issue 11, Pages: 56-61(2019)
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201904144
  CLC： X773;TM621
- Published：2019
- 稿件说明：
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WANG Chunchang, MA Jianmin, ZHANG Yubo, et al. Study on energy-saving effect of bypass waste heat utilization system of air preheater in a 1 000 MW unit boiler[J]. Thermal power generation, 2019, 48(11): 56-61.
DOI：

WANG Chunchang, MA Jianmin, ZHANG Yubo, et al. Study on energy-saving effect of bypass waste heat utilization system of air preheater in a 1 000 MW unit boiler[J]. Thermal power generation, 2019, 48(11): 56-61. DOI： 10.19666/j.rlfd.201904144.

摘要

目前

国内电站燃煤锅炉常用烟气余热利用技术中

主要典型系统有烟气冷却器系统、水媒式烟气-烟气冷却器(MGGH)系统、冷风加热器+烟气冷却器系统、冷风加热器+空气预热器旁路系统4种。本文重点分析了冷风加热器+空气预热器旁路系统及冷风加热器+烟气冷却器系统对锅炉入炉热量及锅炉热效率的影响

并分别从烟气侧与空气侧计算了其影响程度

在此基础上

对上述2种烟气余热利用系统的综合节能效果进行了对比计算。结果表明:冷风加热器+空气预热器旁路系统并非节能效果最优

在各种工况下

其节能效果均小于冷风加热器+烟气冷却器系统;在额定负荷设计工况下

冷风加热器+空气预热器旁路系统节能效果比冷风加热器+烟气冷却器系统低0.797 g/(kW·h)。其原因是该系统将可用于锅炉的能量品位最高的热量用于烟气余热利用系统

违反了能量梯级利用原则。

Abstract

At present

the commonly used flue gas waste heat utilization system in domestic coal-fired power plants mainly includes four typical kinds: the flue gas colder system

the water medium gas-gas cooler(MGGH) system

the cold air heater + flue gas cooler system

and the cold air heater + air preheater bypass system. The influence of the cold air heater + air preheater bypass system and the cold air heater + flue gas cooler system on the heat entering into the boiler and the thermal efficiency of the boiler is analyzed in this paper. Moreover

the influence degree is calculated

from both the flue gas side and the air side. On this basis

comprehensive energy conservation effects of the above two systems are calculated and compared. The result shows that

the cold air heater + air preheater bypass system is not the system with the best energy saving effect. Under various conditions

its energy conservation efficiency is lower than that of the coal air heater + flue gas cooler system. Under rated load design condition

the energy conservation efficiency of the cold air heater + air preheater bypass system is 0.797 g/(kW·h) lower than that of the coal air heater + flue gas cooler system. This is because the cold air heater + air preheater bypass system applies the heat with the highest grade(which can be used in the boiler) to the flue gas waste heat utilization system

which violates the principle of energy cascade utilization.

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