Performance evaluation of semi-dry flue gas desulfurization and denitration from flue gas of a glass melt using nonthermal plasma combined process

The semi-dry plasma and chemical hybrid process (PCHP) has been used for the simultaneous removal of NOx and SOx emitted from a glass melting furnace. In this study, PCHP was conducted through a laboratory-scale model experiment that simulated the aftertreatment system of a full-scale semi-dry glass bottle manufacturing system. The process consisted of two methods: the plasma process in which NO is oxidized using nonthermal plasma and the chemical process in which NO2 produced from NO oxidation is removed using Na2SO3 resulting from the reaction between SO2 and NaOH. Herein, the position of ozone injection was transferred to the inside wall of the reactor to improve the efficiency of simultaneous denitrification and desulfurization through the efficient oxidation of NO. First, NO removal experiments were conducted by changing the spray position, spray liquid flow rate, and flow rate of a mixed simulated gas of NO and SO2. Therefore, over the gas flow rate range from 5 to 15 L/min, the localized cooling area where NO and O3 could be efficiently reacted at the nozzle spray position of z = 400 mm was formed. A NOx removal efficiency of 74% with a ratio of decreased NO to injected O3 (ΔNO/O3) of 88% and SO2 removal efficiency of 100% were achieved by injecting O3 from the inside wall of the reactor when the liquid-gas ratio was 1.17 L/m3.