Relative Accuracy Test Audit Evaluation for Flue Gas Continuous Emission Monitoring Systems in Power Plant

Abstract

Continuous Emissions Monitoring Systems (CEMS) permanently installed for selected processesrequire initial and periodic quality assurance audit tests to ensure that they are functioning properly and reporting emissions accurately. Depending on the industry and process type, there are several sets of regulations that dictate the exact QA/QC requirements that the CEMS must meet. Measurement data by CEMS is a legal base to charge for pollutant emission. But the great masses of CEMS have some problems of high data drift and low measurement accuracy etc. For evaluating CEMS Relative Accuracy, we simultaneously compared SO 2 /NOx and Dust monitoring systems with CEMS and normal handmade sampling method at different boiler load. It draws a conclusion that Relative Accuracy Test Audit (RATA) of SO 2 /NOx monitoring systems goes beyond criterion.

Performance Improvement of Stack Simulator

“…The accuracy and reliability of monitoring data are ensured through regular calibration of CEMS [2]. The RATA of the U.S. Environmental Protection Agency (EPA) is a method for periodic calibration of stack CEMS, including flowmeters [3]. Due to the great difficulty of flow measurement in complex flow field, it is usually impossible to get a low uncertainty measurement result.…”

“…The stack test in China is usually based on the environmental protection standard HJ397, which is similar to the EPA method. Due to the lack of a real traceability system, the accuracy of stack flowmeter after calibration is difficult to be guaranteed [4].…”