Abstract
The plasma and chemical hybrid process (PCHP) is an innovative technology for simultaneous removal of NO_x (NO and NO_2) and SO_x (SO_2 and SO_3). PCHP is demonstrated for an exhaust gas in glass melting furnaces. NO which compose 90% of the NO_x contained in the exhaust gas is oxidized effectively by injecting ozone with the cooling soft water and compressed air using the three-fluid spray nozzle. SO_2 is desulfurized to Na_2SO_3 at the wet-type reactor by absorbing solution of NaOH. Furthermore, oxidized NO_2 is removed to N_2 by Na_2SO_3. As a result, performance of pilot-scale test is maintained stable during 140 min. When the ozone of 1.4 kg/h is injected to exhaust gas which is 6,700 m^3N/h at 150℃, NO_x concentration is reduced to 222 ppm from 301 ppm in average with removal efficiency of 34% (NO is 38%) in maximum. Furthermore, SO_2 concentration decreased to more than 98%. The PCHP that can be applied effectively to wet-type exhaust gas treatment system of glass melting furnace is demonstrated.
