Study on the Variance of N₂O Concentration after Air Pollution Prevention Facility in Bituminous Coal-Firing Power Plant

Abstract

This study intends to check the effects of air pollutant prevention facilities in bituminous coal-fired power plants on N 2 O gas emission concentration. Bituminous coal-fired power plants install and operate air pollution prevention facilities to prevent air pollution. The exhaust gases generated by such coal-fired power plants generally pass through a flue gas denitrification facility for removal of nitrogen oxides, a dust collector for removal of suspended matter, and a flue gas desulfurization facility for removal of sulfur oxides and are emitted through a smokestack. To check the effects of prevention facilities on N 2 O emission concentrations, sampling is necessary at the front end and rear end of each prevention facility. Exhaust gases were collected from the front and rear ends of the flue gas denitrification facility (SCR), the rear end of the electric dust collector (EP), and the measurement hole on the smokestack to analyze the concentrations of the gases. According to the results, it was identified where N 2 O emission concentrations were affected by air pollution prevention facilities. In which air pollutant prevention facilities these differences occurred was analyzed. N 2 O emission concentration decreased after flue gases passed the flue gas desulfurization facility (FGD) in all three power plants. The phenomenon of reduction of N 2 O emission concentrations by bituminous coal-fired power plant FGD is judged attributable to the effect of CaCO 3 used in the FGD.