火电厂大直径烟囱可溯源烟气流量测量方法

doi:10.12141/j.issn.1000-565X.240571

华南理工大学学报(自然科学版) ›› 2025, Vol. 53 ›› Issue (9): 138-148.doi: 10.12141/j.issn.1000-565X.240571

• 能源、动力与电气工程 • 上一篇下一篇

火电厂大直径烟囱可溯源烟气流量测量方法

卢志民¹ 谢子立¹ 卢伟业² 陈小玄² 黄泳如¹ 刘泽明¹ 姚顺春¹

1．华南理工大学电力学院，广东广州 510640；

2．广东省特种设备检测研究院顺德检测院，广东佛山528000

出版日期:2025-09-25 发布日期:2025-03-12

Traceable Flue Gas Flow Rate Measurement Method for Large Diameter Stack of Thermal Power Plant

LU Zhimin¹ XIE Zili¹ LU Weiye² CHEN Xiaoxuan² HUANG Yongru¹ LIU Zeming¹ YAO Shunchun¹

1. School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China;

2. Guangdong Institute of Special Equipment Inspection and Research Shunde Branch, Foshan 528000, Guangdong, China

Online:2025-09-25 Published:2025-03-12

摘要/Abstract

摘要：

示踪气体稀释法能克服电厂大直径烟囱流场复杂导致的烟气流量测量结果误差大的问题，该方法具有可溯源性，且测量原理与常规速度面积法不同，具有作为一种流量测量现场校准方法的潜力。因此，本文基于数值模拟方法分析示踪气体稀释法在火电厂烟囱烟气流量测量中的可行性与准确性，并在此基础上，研究示踪剂稀释比例、示踪剂注入截面对测量的影响，此外还设置不同示踪剂取样方案来评估测量的稳定性。结果表明：在约9D高度处，示踪剂与烟气实现充分混合；示踪剂稀释比例过高或过低均会影响示踪剂与烟气的混合效率；示踪剂在烟道处注入能有效减小流量测量误差。烟囱注入时，各取样方案的误差波动范围较大，但三点取样有较稳定且良好的测量表现，在3D、8D、12D上的测量误差分别仅为-3.59%、-0.69%、-1.05%；烟道注入时各取样方案的流量测量误差均不超过±10%，且三点取样时，在3D、8D、12D截面上的测量误差分别仅为0.98%、-0.52%、0.21%，均在±1%以内。本研究证明了示踪气体稀释法在大直径烟囱烟气流量测量中的可行性与准确性。

关键词: 大直径烟囱, 烟气流场, 流量测量, 量值溯源, 示踪气体稀释法

Abstract:

The tracer gas dilution method can overcome the issue of significant errors in flue gas flow measurements resulting from the complexity of the flow field in large-diameter stacks in power plants. The method is traceable and the measuring principle differs from that of the conventional velocity-area method, thus offering the potential for utilization as an on-site calibration method for flow measurements. This paper thus analyses the feasibility and accuracy of the tracer gas dilution method in flue gas flow rate measurement of thermal power plant stacks based on numerical simulation. Furthermore, it studies the influence of the tracer dilution ratio and the tracer injection cross-section on the measurements, in addition to setting up different tracer sampling schemes to assess the stability of the measurements. The results demonstrate that at a height of approximately nine times the diameter of the stack (9D), the tracer and flue gas can be fully mixed to satisfy the measurement requirements of the tracer gas dilution method. An excessively high or low tracer dilution ratio will impair the mixing efficiency of the tracer and the flue gas. When the tracer is injected at the flue can effectively reduce the flow measurement error. When the tracer is injected at the stack, the error fluctuation range of each sampling method is considerable. However, the three-point sampling method demonstrates a stable and reliable measurement performance, with measurement errors on 3D, 8D and 12D being only -3.59%, -0.69% and -1.05%, respectively. When the tracer is injected at the flue, the flow measurement errors of each sampling method are not greater ±10%, and the measurement errors of the three-point sampling method are only 0.98%, -0.52% and 0.21%, which are all within ±1% on the cross section of 3D, 8D and 12D, respectively. This study demonstrates the feasibility and accuracy of the tracer gas dilution method in flue gas flow measurement in thermal power plants.

Key words: large diameter stack, flue gas flow field, flow rate measurement, traceability, tracer gas dilution method

卢志民, 谢子立, 卢伟业, 等. 火电厂大直径烟囱可溯源烟气流量测量方法[J]. 华南理工大学学报(自然科学版), 2025, 53(9): 138-148.

LU Zhimin, XIE Zili, LU Weiye, et al. Traceable Flue Gas Flow Rate Measurement Method for Large Diameter Stack of Thermal Power Plant[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(9): 138-148.

火电厂大直径烟囱可溯源烟气流量测量方法

Traceable Flue Gas Flow Rate Measurement Method for Large Diameter Stack of Thermal Power Plant

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