A absorption-low temperature plasma (DBD) adsorption coupled spray tower removal method was proposed to address the problem of poor removal efficiency of asphalt smoke using a single separation method. The jet spectrum analysis of DBD discharge was carried out; An experimental device was established to test a certain asphalt flue gas, analyze the removal characteristics and correlations of each unit, and investigate the effects of DBD discharge current and flue gas volume on the removal performance. The results showed that there were a large number of excited state N2 molecules and OH radicals in the discharge region of DBD, which could collide and react with NOx, SO2 and VOCs, forming a synergistic removal effect. The removal efficiency of each unit of the purification system from strong to weak was as follows: DBD, spray tower, activated carbon box. DBD produced by-products (NO2, N2O4 or SO3, etc.) during the removal of NOx and SO2, and the adsorption capacity of activated carbon was relatively small. After DBD treatment, small molecules generated by VOCs were further adsorbed and removed by activated carbon by about 19.56％. The air volume and DBD current had little effect on the removal rate of VOCs, but could significantly regulate the removal of NOx and SO2. The system had good treatment effect on NOx, SO2, and VOCs in asphalt flue gas, and the exhaust emission mass concentration at the outlet met the mass concentration indicators for pollutant emissions specified in the national standard (GB16297—1996).
Low temperature plasma (DBD)Spectral characteristicsAsphalt flue gasRemoval rateEmission index
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