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| Study on the Stack Cross Section Area Calibration Facility and Its Uncertainty Evaluation |
| YANG Yang1,2,ZHANG Liang2,3,ZHANG Hong-jun1,WANG Chi2,3,KONG Hai-yan4,5,ZHU Ze-jun4,5 |
1.中国计量大学 计量测试工程学院, 浙江 杭州 310018
2.中国计量科学研究院, 北京 100029
3.郑州计量先进技术研究院, 河南 郑州 450001
4.河南省环境监测技术重点实验室, 河南 郑州 450004
5.河南省生态环境监测中心,河南郑州450004 |
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Abstract In order to ensure the accuracy of stack flowrate measurement based on velocity area method,it is necessary to accurately measure the stack cross section area.A stack cross section area calibration facility is developed,which can accurately measure the internal geometry of stack,and then calculat cross section area.At the same time,the cross section area fitting characteristics of random sampling method and least square method are discussed.After comparison and optimization,the maximum error of the average value of the fitted model is 0.02%,and the facility repeatability is 0.013%.Meanwhile the measurement uncertainty of the facility is evaluated,and the relative expended uncertainty is 0.17%(k=2).
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Received: 20 December 2019
Published: 02 November 2020
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2020, Vol. 41 
