Simultaneous Desulfurization And Denitrification By Microwave Reactor With Ammonium Bicarbonate And Zeolite

摘要

Microwave reactor with ammonium bicarbonate (NH_4HCO_3) and zeolite was set up to study the simultaneous removal of sulfur dioxide (SO_2) and nitrogen oxides (NO_x) from flue gas. The results showed that the microwave reactor filled with NH_4HCO_3 and zeolite could reduce SO_2 to sulfur with the best desulfurization efficiency of 99.1% and reduce NO_x to nitrogen with the best NO_x purifying efficiency of 86.5%. Microwave desulfurization and denitrification effect of the experiment using ammonium bicarbonate and zeolite together is much higher than that using ammonium bicarbonate or zeolite only. NO_x concentration has little effect on denitrification but has no influence on desulfurization, SO_2 concentration has no effect on denitrification. The optimal microwave power and empty bed residence time (EBRT) on simultaneous desulfurization and dentrification are 211-280W and 0.315 s, respectively. The mechanism for microwave reduced desulfurization and denitrification can be described as the microwave-induced catalytic reduction reaction between SO_2, NO_x and ammonium bicarbonate with zeolite being the catalyst and microwave absorbent.