APPARENT ENERGY YIELD OF A HIGH-EFFICIENCY PULSE-GENERATOR WITH RESPECT TO SO2 AND NOX REMOVAL

The pilot plant of pulse corona for flue gas treatment has been put into operation some years ago, yet the apparent energy yield is still a key situation to be improved both in commercial and in bench-scale. Two approaches have been carried out by us to solve this problem, namely based upon high efficiency pulse generator/reactor system and plasma chemistry mechanism. In this paper, a thorough examination of the electrical parameters of the generator/reactor coupling system versus removal efficiency was conducted. Thereby an innovative circuit design for the high efficiency pulse generator was suggested. Moreover, the optimization of the coupling system led to an empirical relation between the capacitances of the two condensers C(f) = (7-10)C(L). The generator thus improved gives a fairly high efficiency of >65%. Testing of its feasibility for laboratory simulated flue gas treatment showed promising results. With an initial concentration of 2000 ppm SO2 and 200-300 ppm NO, when ammonia is injected, the removal efficiencies are of >95% and 30-57% respectively, while the corresponding total energy input is only 4.2 Wh/Nm3 as measured. The resulting apparent energy yield for SO2 is as high as 1.3 g/Wh.