基于复杂流场的烟气流量测量技术数值模拟研究  

Numerical simulation of flue gas flow measurement technology based on complex flow field

作　　者：马修元 韦飞 宣添星 王新培 MA Xiuyuan;WEI Fei;XUAN Tianxing;WANG Xinpei(State Power Environmental Protection Research Institute Co.,Ltd.,Nanjing 210031,China;China Energy Science and Technology Research Institute Co.,Ltd.,Nanjing 210023,China)

机构地区：[1]国电环境保护研究院有限公司,江苏南京210031 [2]国家能源集团科学技术研究院有限公司,江苏南京210023

出　　处：《热力发电》2024年第4期102-111,共10页Thermal Power Generation

基　　金：国家重点研发计划项目(2022YFC3701504);国家能源集团科学技术研究院有限公司科技项目(HB2023Y05)。

摘　　要：烟气流量是影响碳监测精度的关键因素之一,而分布不均、随机组负荷变化而改变的复杂流场环境是阻碍烟气流量精准计量的主要因素。以某电厂660 MW机组烟囱入口烟道为研究对象,基于烟气流场数值模拟结果对比分析了4种不同测量原理的流量计测量精度随点位数量、工艺布置形式等因素的影响变化规律。结果表明:与矩阵流量计相比,多点皮托管流量计对复杂流场环境的适应性更好;在测点数量同为28的情况下,矩阵流量计偏差是多点皮托管流量计的1.54倍;光闪烁流量计测量精度受安装位置标高影响较大,最大偏差是最小偏差的23.3倍,表明光闪烁流量计对复杂流场环境的适应性较差;超声波流量计可倾斜安装和多声道安装,工艺布置形式灵活多变,对复杂流场的适应性显著提高,双声道布置时可将偏差控制在±1.5%以内。研究成果为流量计设备选型及工艺设计提供了重要的理论依据和数据支撑,具有重要的理论研究及工程应用价值。Flue gas flow is one of the key factors affecting the accuracy of carbon monitoring,and the complex flow field environment with uneven velocity distribution and changing with unit load is the main factor impeding the accurate measurement of flue gas flow.By taking a chimney inlet flue of a 660 MW unit in a power plant as the research object,the influence of the number of points and the layout of the process on measurement accuracy of the flowmeter with four different measurement principles was compared and analyzed based on numerical simulation results of the flue gas flow field.The results show that,the multipoint Pitot tube flowmeter has better adaptability to the complex flow field environment compared with the matrix flowmeter.When the number of measuring points is 28,the deviation of the matrix flowmeter is 1.54 times that of the multipoint Pitot tube flowmeter.The measurement accuracy of the light scintillation flowmeter is greatly affected by the elevation of the installation position,with the maximum deviation being 23.3 times the minimum deviation.This indicates that the light scintillation flowmeter has poor adaptability to complex flow field environments.The ultrasonic flowmeter can be installed obliquely and in multiple channels,with a more flexible and varied process layout,significantly improving its adaptability to complex flow fields.The dual-channel arrangement can control the deviation within±1.5%.The research results provide important theoretical basis and data support for the selection of flow meter equipment and process design,and have important theoretical research and engineering application value.

关 键 词：碳监测 复杂流场 流量计 数值模拟 工艺布置 

分 类 号：X773[环境科学与工程—环境工程]