NUMERICAL SIMULATION OF PRIMARY AIR MEASUREMENT AT THE INLET OF COAL MILL

CHANG Yijun1; WANG Xiaobing2; ZHANG Bo2; NIU Guoping2 1.Huaneng Yuhuan Power Plant

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NUMERICAL SIMULATION OF PRIMARY AIR MEASUREMENT AT THE INLET OF COAL MILL

更新时间：2025-09-28

- NUMERICAL SIMULATION OF PRIMARY AIR MEASUREMENT AT THE INLET OF COAL MILL
- Thermal Power Generation Vol. 41, Issue 12, Pages: 48-50(2012)
- 作者机构：
  
  1. 华能玉环电厂
  2. 西安热工研究有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK223.25
- Published：2012
- 稿件说明：
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CHANG Yijun1, WANG Xiaobing2, ZHANG Bo2, et al. NUMERICAL SIMULATION OF PRIMARY AIR MEASUREMENT AT THE INLET OF COAL MILL[J]. Thermal power generation, 2012, 41(12): 48-50.
DOI：

CHANG Yijun1, WANG Xiaobing2, ZHANG Bo2, et al. NUMERICAL SIMULATION OF PRIMARY AIR MEASUREMENT AT THE INLET OF COAL MILL[J]. Thermal power generation, 2012, 41(12): 48-50. DOI：

摘要

磨煤机入口一次风量测量的稳定性和准确性较低

是由于冷、热风混合段到测量截面间的距离较短

冷、热风不能完全均匀混合所致。通过数值模拟的方法

在一次风管道内冷、热风混合处安装导流叶片

增加冷风的射流深度

使测量截面的温差从原来的166℃降到22℃

测量截面的速度变化范围从13～25.8m/s减小到20～22m/s。加装混流装置后

使冷、热风混合更充分

有效地改善了测量截面上速度和温度分布的均匀性

风量测量系数稳定

准确性明显提高。

Abstract

Because of the short distance between the hot-cold air mixed segment and the measuring cross section

the hot air was unable to fully mixed with the cold air

so the stability and accuracy of measurement for primary air at inlet of the coal mill was relatively low.Through numerical simulation

the guide blade was installed in primary air pipe where hot and cold air mixed together

to increase the penetration depth of the cold air.The temperature difference of the measured cross section dropped from 166 ℃ to 22 ℃

and the variation range of speed on it decreased from 13-25.8 m/s to 20-22 m/s.After the flow mixed device was installed

the hot and cold air were fully mixed

effectively improving the uniformity of speed and temperature distribution on the measuring cross section.The air flow measurement coefficient was stable and the accuracy was improved obviously.

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