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

摘要

The semi-dry plasma and chemical hybrid process (PCHP) has been used for the simultaneous removal of NO_(x) and SO_(x) 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 NO_(2) produced from NO oxidation is removed using Na_(2)SO_(3) resulting from the reaction between SO_(2) 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 SO_(2). Therefore, over the gas flow rate range from 5 to 15 L/min, the localized cooling area where NO and O_(3) could be efficiently reacted at the nozzle spray position of z = 400 mm was formed. A NO_(x) removal efficiency of 74% with a ratio of decreased NO to injected O_(3) (ΔNO/O_(3)) of 88% and SO_(2) removal efficiency of 100% were achieved by injecting O_(3) from the inside wall of the reactor when the liquid-gas ratio was 1.17 L/m~(3).