基于阵列式烟气流量测量系统单点测量精度的数值模拟研究OA

[Objective]With the rapid development of industrialization,coal and other fossil fuels have caused serious environmental pollution.As the main emission of industrial production process,the emission of flue gas has a particularly good impact on environmental pollution.Therefore,the accurate measurement of flue gas flow becomes the key link to control pollution and optimize energy utilization.As a new high precision flow measurement technology,array measurement system has gradually become the mainstream way.[Methods]The purpose of this study is to build the mathematical model of the annular low-speed wind tunnel by CFD numerical simulation software,and to explore the influence of key parameters such as the stability of the flow field of the measuring platform and the design of the pitot tube structure of the measuring equipment-installation angle,measuring hole inclination,flow rate on the single point measurement accuracy of the array measurement system.[Results]The results showed that:(1)annular low-speed wind tunnel had good flow field stability under different flow rates.(2)In the design of pitot tube structure,the measurement method of vertical installation was better than the measurement in the direction of offset 30°,and the relative standard error is reduced from 8.67%to 3.87%.(3)The measuring accuracy of the pitot tube increased with the increase of the inclination of the measuring hole,and the relative error of the measurement when it was maintained at 30° in the first working section was the smallest,only 2.16%,but the specific inclination of the measuring hole should be determined according to the actual situation.(4)The relative standard error of measurement was linearly related to the flow at the entrance of the measurement platform,so the flow range of the measuring medium should also be considered under the same measurement conditions.[Conclusion]The research results were expected to play a greater role for the array measurement system in the field of flue gas flow measurement,improved the accurate monitoring and control of flue gas emissions,and vigorously promoted the development of industrial intelligence and thermal green under the goal of the carbon peaking and carbon neutrality.