1. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. Hangzhou Zunbang Technology Co Ltd, Hangzhou, Zhejiang 310018, China
Abstract：Continuous Emission Monitoring System (CEMS) has been widely used in the emission monitoring of flue gas pollution of combined heat and power plants, and the data were uploaded to the ecological environment department in real time. In order to evaluate the accuracy and reliability of the CEMS monitoring data of a thermal power plant, uncertainty contributions to the flue gas pollutants measurement results were evaluated, such as zero drift, range drift, indication error, measurement error, standard gas species concentration and measuring repeatability. Results showed that the expanded uncertainties of SO2, NO and NO2 were 2.28mg/m3, 3.50mg/m3 and 0.50mg/m3, respectively, when coverage factor is k=2 and level of confidence is 95%. Because the reference method and CEMS have different sampling methods for flue gas monitoring, the uncertainty component introduced by the measurement error is the largest.
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2021, Vol. 42 
