6 种典型流场中超声流量计校准系数随企业污染源烟气排放量变化研究

采用计算流体力学方法,对6种典型流场中超声流量计校准系数随企业污染源烟气不同流速变化的规律进行研究。分析不同负荷下超声流量计校准系数相对标准偏差在不同声道角度、管道直径、声道布置形式、上游直管段长度、管道形式时的变化规律。通过国家烟道流量计量标准装置进行实验验证,验证结果表明:不同负荷下校准系数相对标准偏差均未超过1%,且可以通过单负荷校准实现对烟道超声流量计的校准。

Research on Change of Calibration Coefficient of Ultrasonic Flowmeter with the Amount of Enterprise Pollution Source Flue Gas in Six Typical Flow Fields

Computational fluid dynamics is used to study the variation of calibration coefficient of ultrasonic flowmeter with different loads of the enterprise in six typical flow fields. The variation of relative standard deviation of calibration coefficient of ultrasonic flowmeter under different loads is analyzed under different path angle, pipe diameter, path layout, length of upstream straight pipe and pipe form. Through the experimental verification of the national stack flowrate standard facility, the results show that the relative standard deviation of calibration coefficient under different loads is less than 1%, and the stack ultrasonic flowmeter can be calibrated by single load calibration.