Dehumidification performance of the Nation tube for SO2 at low concentration

摘要

Under the new situation of low emission standard for coal-fired power plants, improving sample dehumidification technology is the key to accurate monitoring of ultra-low concentration SO2 flue gas. As a new dehumidification technology, Nafion membrane had been considered as a promising alternative to pretreatment for Continuous Emission Monitoring System (CEMS). The factors affecting the dehumidification efficiency of Nafion tube and the SO2 preservation rate were investigated by simulating the flue gas experiment. The results showed that the gas flow rate and SO2 concentration had no significant effect on Nafion dehumidification efficiency and preservation rate. The humidity increased correspondingly to the dehumidification rate, which increased by 0.3%, but when the humidity increased from 15% to 30%, the preservation rate decreased by 1%, and when the SO2 concentration increases, the effect decreased.