Open AccessUncertainty Research of Particles Concentration Measurement in Continuous Emission Monitoring System of Thermal Power Plants
Author(s) -
Tianqi Liang,
Tianlin Zheng,
Guangxue Zhang,
Luyao Ma,
Hong Xu
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/721/1/012008
Subject(s) - repeatability , reliability (semiconductor) , confidence interval , measurement uncertainty , range (aeronautics) , thermal power station , environmental science , interval (graph theory) , thermal , nuclear engineering , power (physics) , reliability engineering , statistics , materials science , mathematics , engineering , physics , meteorology , thermodynamics , electrical engineering , combinatorics , composite material
In order to monitor the reliability of the CEMS operation data of a thermal power plant in Hangzhou, the data of its operation process were collected. The components of uncertainty influencing on the particles concentration measurement, including zero drift, range drift, relative accuracy and measuring repeatability, were analyzed in the system. The confidence interval (2.80%) and the allowable interval (8.94%) were introduced to ensure the reliability of the system data. The result of evalution shows that the related expanded uncertainty of particles concentration measurement is 9.26% when coverage factor is k=2 and level of confidence is 95%. Measuring repeatability is the main factor affecting the uncertainty.