Experimental study on the true value of flue gas flow rate from coal-fired power plants using a reflux wind tunnel

ZHU Haotian; LI Junzhuang; ZHU Yeqing; WEI Fei; WEI Han; MA Xiuyuan; YAN Junbo; HOU Shen; DU Meng; XU Henghui

doi:10.19944/j.eptep.1674-8069.2026.04.011

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Experimental study on the true value of flue gas flow rate from coal-fired power plants using a reflux wind tunnel

Carbon capture and monitoring technology | 更新时间：2026-10-14

- Experimental study on the true value of flue gas flow rate from coal-fired power plants using a reflux wind tunnel
- Electric Power Technology and Environmental Protection Vol. 42, Issue 4, Pages: 624-634(2026)
- 作者机构：
  
  国电环境保护研究院有限公司，江苏南京 210031
- 作者简介：
- 基金信息：
- DOI：10.19944/j.eptep.1674-8069.2026.04.011
  CLC： TK01
- Received：16 December 2025，
  
  Accepted：31 March 2026，
  
  Published：15 August 2026
- 稿件说明：
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朱昊天,李军状,祝业青，等.煤电烟气流量真值的回流风洞试验研究[J].电力科技与环保,2026,42(4):624-634.

ZHU Haotian, LI Junzhuang, ZHU Yeqing, et al. Experimental study on the true value of flue gas flow rate from coal-fired power plants using a reflux wind tunnel[J]. Electric Power Technology and Environmental Protection, 2026, 42(4):624-634.
朱昊天,李军状,祝业青，等.煤电烟气流量真值的回流风洞试验研究[J].电力科技与环保,2026,42(4):624-634. DOI： 10.19944/j.eptep.1674-8069.2026.04.011.

ZHU Haotian, LI Junzhuang, ZHU Yeqing, et al. Experimental study on the true value of flue gas flow rate from coal-fired power plants using a reflux wind tunnel[J]. Electric Power Technology and Environmental Protection, 2026, 42(4):624-634. DOI： 10.19944/j.eptep.1674-8069.2026.04.011.

摘要

目的

烟气流量测量是CO

排放量在线监测的关键环节，其准确性直接决定碳排放量核定的可靠性。本研究旨在通过实验探究不同流场条件下多点测量法与超声波线测量法的测量偏差特性，为优化碳排放在线监测系统中的流量测量工艺提供技术支撑。

方法

采用模块化烟道模型模拟不同直管段长度，实验在回流式风洞4 m×3 m×24 m试验段中进行，通过实验分析多点测量法与超声波线测量法在不同流场分布下的测量偏差特性，在试验段中放置烟道模型，烟道模型口径为50 cm×50 cm的正方形，热线式流量计共3只，采用插入式设计，安装在一个50 cm×50 cm×50 cm模块上；超声波流量计共2对，采用交叉式设计，安装在一个50 cm×50 cm×100 cm模块上。

结果

对于多点测量法，其相对偏差与平均流速、流场分布相关性较弱，主要取决于测点数量：对于实验所涉及的几种流场分布情况，4点测量相对偏差在5%到10%之间，6点测量相对偏差基本可以控制在4%以内，15点测量相对偏差基本可以控制在2%以内。对于超声波线测量法，研究两种声道路径的测量偏差，两种声道采取交叉式布置：声道1上游探头安装在烟道模型弯头后的内弧侧壁面，下游探头安装在烟道模型弯头后的外弧侧壁面，声道2上游探头安装在烟道模型弯头后的外弧侧壁面，下游探头安装在烟道模型弯头后的内弧侧壁面。分别分析两种声道的测量偏差，短直管段情况下，声道1测量值低于真值，且相对偏差随平均流速增大而增大，声道2测量值高于真值，相对偏差随平均流速增大而减小。当平均流速大于5.5 m/s时，声道2的测量偏差更小，考虑火电机组烟气实际流速，声道2对应的路径类型更适用于烟气流量监测。

结论

本研究可为CO

排放在线监测系统的流量测量工艺设计及优化提供实验依据。

Abstract

Objective

Flue gas flow measurement is a critical component in the online monitoring of CO

emissions

and its accuracy directly determines the reliability of carbon emission accounting. This study aims to experimentally investigate the measurement deviation characteristics of the multi-point averaging method and the ultrasonic transit-time method under different flow field conditions

providing technical support for optimizing flow measurement techniques in carbon emission online monitoring systems.

Methods

A modular flue duct model was used to simulate different lengths of straight pipe sections. Experiments were conducted to analyze the measurement deviation characteristics of the multi-point method and the ultrasonic method under various flow field distributions

offering technical support for optimizing flow measurement techniques in online carbon emission monitoring.The experiment was conducted in the return-flow wind tunnel with a 4 m × 3 m × 24 m test section

where a flue model was placed. The flue model had a square cross-section of 50 cm × 50 cm. Three hot-wire flowmeters

designed as insertion-type

were installed on a 50 cm × 50 cm × 50 cm module. Additionally

two pairs of ultrasonic flowmeters

arranged in a crossed configuration

were mounted on a 50 cm × 50 cm × 100 cm module.

Results

For the multi-point averaging method

the relative deviation showed weak correlation with average flow velocity and flow field distribution

primarily depending on the number of measurement points. Under the several flow field distributions involved in the experiment

the relative deviation for 4-point measurements ranged from 5% to 10%. For 6-point measurements

the deviation was generally controllable within 4%

and for 15-point measurements

it was generally controllable within 2%. For the ultrasonic transit-time method

the measurement deviations of two acoustic path configurations were studied. The two paths were arranged in a crossed layout: for Path 1

the upstream transducer was installed on the inner arc sidewall after the bend of the duct model

and the downstream transducer on the outer arc sidewall; for Path 2

the upstream transducer was installed on the outer arc sidewall after the bend

and the downstream transducer on the inner arc sidewall. Analyzing the measurement deviations of the two paths separately showed that under short straight pipe conditions

Path 1 measurements were lower than the true value

with the relative deviation increasing as the average flow velocity increased. Path 2 measurements were higher than the true value

with the relative deviation decreasing as the average flow velocity increased. When the average flow velocity exceeded 5.5 m/s

the measurement deviation of Path 2 was smaller. Considering the actual flue gas velocity in thermal power units

the path type corresponding to Path 2 is more suitable for application in flue gas flow monitoring.

Conclusion

The results of this study provide an experimental basis for the design and optimization of flow measurement techniques in CO

emission online monitoring systems.

关键词

Keywords

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