Applications and Discussion of Non-dispersed Infrared CEMS in Monitoring of Ultra-low Emission of Gaseous Pollutants
During the application of existing non-dispersed infrared CEMS,SO2 and NO test results will show some deviation due to the cross interference of water,CH4 and other factors in the flue gas,it is difficult to satisfy the requirement of ultra-low emission.The cause for the occurrence of condensate during non-dispersive infrared CEMS operation and the interference characteristics of the water and CH4 in flue gas to infrared absorption wave band are investigated.Methods to solve the condensate of the sample gas pipe and to reduce the moisture content in the flue gas are proposed,and a method to eliminate the interference of CH4 on the SO2 measurement data and the optimization scheme for CEMS is proposed.The actual application results show that the improved CEMS has strong anti-interference properties against water vapor and other components in the flue gas,and an accurate monitoring method for the monitoring of ultra-low emission of gaseous pollutants is provided.
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