Pilot-scale exhaust gas treatment for a glass manufacturing system using a plasma combined semi-dry chemical process

A pilot-scale simultaneous removal of NOx and SOx as a nonthermal plasma and chemical hybrid process (PCHP) is carried out on combustion exhaust gas in a glass manufacturing system. The exhaust gas (12700 m3N/h) is produced by the combustion of fossil fuels and contains both NOx (160 ppm) and SOx (150 ppm). In PCHP, NO is oxidized to water-soluble NO2 through a plasma process using ozone generated from a plasma ozonizer. Na2SO3 is then produced as a by-product in a desulfurizing process using a solution of NaOH. The generated NO2 is then reduced to harmless N2 using an Na2SO3 solution. We implement the PCHP in an actual semi-dry type exhaust gas treatment system of a glass manufacturing system. NO oxidation efficiency of more than 75% is achieved by ozone generation. The NO2 generated by O3 injection is removed by the Na2SO3 solution as a by-product before the gas dried. NOx and SOx removal efficiencies of 30% and 63%, are obtained. Furthermore, de-NOx in bag filter (BF) is discussed for the injection of the NaHCO3 in the BF inlet. Due to the synergistic effect of ozone and NaHCO3, an NOx removal efficiency of 45% is obtained. The results of the experiment show that higher de-NOx and de-SOx efficiencies are obtained by maintaining a local exhaust gas temperature of less than 150 °C. Through this experiment, it is confirmed that this simultaneous treatment of NOx and SOx using semi-dry type PCHP is highly effective and promising for exhaust gas treatment in glass manufacturing.