Simultaneous DeNo<SUB>x</SUB> and DeSO<SUB>x</SUB> Technology Using Non-Equilibrium Plasma and Chemical Hybrid Process

Abstract

A series of experiments were carried out to evaluate the simultaneous NOx and SOx removal using the plasma-chemical hybrid process and to quantify all the reaction byproducts such as N2O and CO. The oxidation from NO to NO2 without decreasing NOx concentration and with least power consumption is the key for obtaining the optimum reactor operating condition. The produced NO2 was totally converted to N2 and Na2SO4 with Na2SO3 or Na2S by the chemical reactor, while NaOH was used to neutralize H2SO3 and H2SO4 in the solution. The final products is water soluble and nontoxic Na2SO4. The NO2 reduction was more effective for Na2S than Na2SO3 but 2 ppm of H2S was produced. The hybrid process showed nearly 100% NOx and SOx simultaneous removal with less than 11 ppm of N2O and CO, and the power consumption using the pulse plasma reactor was less than 1/4 using the packed-bed plasma reactor.