Real-time measurement methods for flue gas temperature at furnace outlet in large scale power plants

WANG Zhiwei; WU Wenxiang; LI Hongrui

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Real-time measurement methods for flue gas temperature at furnace outlet in large scale power plants

更新时间：2025-09-28

- Real-time measurement methods for flue gas temperature at furnace outlet in large scale power plants
- Thermal Power Generation Vol. 45, Issue 9, Pages: 74-80(2016)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能汕头电厂
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.2
- Published：2016
- 稿件说明：
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WANG Zhiwei, WU Wenxiang, LI Hongrui. Real-time measurement methods for flue gas temperature at furnace outlet in large scale power plants[J]. Thermal power generation, 2016, 45(9): 74-80.
DOI：

WANG Zhiwei, WU Wenxiang, LI Hongrui. Real-time measurement methods for flue gas temperature at furnace outlet in large scale power plants[J]. Thermal power generation, 2016, 45(9): 74-80. DOI：

摘要

为了实现炉膛出口烟气温度的实时准确测量

指导机组安全经济运行

在比较目前常用的几种炉膛出口烟气温度测量方法的基础上

通过在锅炉炉膛出口和水平烟道加装特殊热电偶

对炉膛出口多截面多位置的烟气温度进行了实时测量

并对因周围低温受热面引起的"冷壁辐射"测量值偏差进行了修正;同时

利用对流受热面的进口烟气温度分布和出口汽温分布之间的关系

对末级再热器入口的烟气温度分布进行了初步计算。测量和计算结果表明:该方法能够实时测量锅炉炉膛出口烟气温度

测量准确度较高

一方面实现了炉膛出口沿宽度方向的烟气温度分布的实时计算;另一方面可以辅助监控锅炉的燃烧情况

指导锅炉进行燃烧调整

防止炉膛出口烟气温度过高和烟气温度偏差引起的受热面结焦、堆渣、超温爆管等事故。

Abstract

In order to measure the flue gas temperature at furnace outlet in real time and guide the operation in power stations

real-time temperature measurement on furnace outlet gas of large scale power plants was carried out.The thermocouples were installed at the furnace outlet and the horizontal flue pass to detect the flue gas temperature

and the inaccuracy of measurement caused by the low temperature of walls in the around was modified.The temperature distribution of flue gas at inlet of the final reheater was also calculated based on the relationship between the temperature distribution of the inlet flue gas and the outlet steam of the convection heating surface.The measurement and calculation results indicate that

the above method can measure the flue gas temperature at the furnace outlet with high accuracy and calculate the flue gas temperature distribution along the furnace width direction.This method can be used to monitor the combustion condition of boilers

guide adjusting combustion parameters

and avoid slagging and blowing of pipes caused by flue gas over temperature and the left and right temperature deviation.

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