CAUSE ANALYSIS OF TUBE-WALL TEMPERATURE OVERRUN IN THE FINAL-STAGE SUPERHEATER OF SG2080/25.4-M969 TYPE BOILER AND DISPOSAL THEREOF

FENG Qiang1; HUANG Xiangbin1; WEI Tongsheng2; CHEN Deqiang1 1.Guohua Cangdong Power Generation Co Ltd

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CAUSE ANALYSIS OF TUBE-WALL TEMPERATURE OVERRUN IN THE FINAL-STAGE SUPERHEATER OF SG2080/25.4-M969 TYPE BOILER AND DISPOSAL THEREOF

更新时间：2025-09-28

- CAUSE ANALYSIS OF TUBE-WALL TEMPERATURE OVERRUN IN THE FINAL-STAGE SUPERHEATER OF SG2080/25.4-M969 TYPE BOILER AND DISPOSAL THEREOF
- Thermal Power Generation Vol. 40, Issue 10, Pages: 85-87(2011)
- 作者机构：
  
  1. 国华沧东发电有限责任公司
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK228
- Published：2011
- 稿件说明：
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FENG Qiang1, HUANG Xiangbin1, WEI Tongsheng2, et al. CAUSE ANALYSIS OF TUBE-WALL TEMPERATURE OVERRUN IN THE FINAL-STAGE SUPERHEATER OF SG2080/25.4-M969 TYPE BOILER AND DISPOSAL THEREOF[J]. Thermal power generation, 2011, 40(10): 85-87.
DOI：

FENG Qiang1, HUANG Xiangbin1, WEI Tongsheng2, et al. CAUSE ANALYSIS OF TUBE-WALL TEMPERATURE OVERRUN IN THE FINAL-STAGE SUPERHEATER OF SG2080/25.4-M969 TYPE BOILER AND DISPOSAL THEREOF[J]. Thermal power generation, 2011, 40(10): 85-87. DOI：

摘要

国华沧东发电有限责任公司3、4号超临界机组的SG2080/25.4-M969锅炉运行过程中

由于末级过热器管壁温度频繁超限

导致2台锅炉的过热汽温达不到设计值。以4号锅炉为研究对象

对末级过热器管壁温度频繁超限的原因进行的试验表明

水平烟道左侧的温度场不均匀是导致锅炉末级过热器左侧管壁金属温度超限的主要原因。通过配风方式的调整

降低了左侧过热蒸汽温度与最高管壁金属温度的差值

提高了左侧过热蒸汽温度的运行值。另外

建议取消炉膛-风箱差压控制方式

在一定负荷区间保持二次风门开度的相对稳定

以获取稳定的烟气温度场和速度场分布。经调整后

3、4号锅炉末级过热器温度可接近或达到设计值运行。

Abstract

In the operation process of SG2080/25.4-M969 type boilers for ultra-supercritical units no.3 and no.4 in Guohua Cangdong Power Generation Co Ltd

owing to frequent overrun of the tube-wall temperature in final-stage superheater

the temperature of superheated steam in said two boilers can't reach the designed values.Taking boiler no.4 as the object of study

the causes leading to frequent overrun of tube-wall temperature in final-stage superheater have been tesed

it shows that the main cause resulting in frequent overrun of the left-side tube-wall metall's temperature is the non-uniform temperature field at the left-side in the horizontal flue duct.Through adjustment of the air distribution mode

the difference value between the left-side superheated steam temperature and the highest tube-wall metall temperature has been reduced

enhancing the operation value of the left-side superheated steam temperature.Moreover

cacellation of differential pressure control mode for boiler-windbox has been recommended

the open-degree of secondary air gate being maintained at a relative stable level in a certain load range

so as to obtain a stable flue gas temperture field and stable speed field distribution.After the said adjustment

the temperature of fianl-stage superheater in boiler no.3 and no.4 can close to or reach the designed value in operation.

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