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.

Identifying Key Sources of City Air Quality: A Hybrid MCDM Model and Improvement Strategies

“…The air pollution generated from existing coal-fired power plants has a significantly negative effect on human health and the environment and necessitates upgrades for existing power plant equipment [16,17]. The emission concentration of pollutants dramatically decreased because of flue gas desulfurization facilities installed at power plants [18].…”

High Performance of Commercial PAC on the Simultaneous Desulfurization and Denitrification of Wastewater From a Coal-Fired Heating Plant

“…Coal-fired heating plants are widespread in cold regions of cities/towns, with the mass consumption of high-quality coal every year. Consequently, coal-fired flue gas is discharged, alongside the release of NO x and SO 2 from the burning of N/S-bearing impurities in coal (Cho et al, 2017;Conidi et al, 2018). These levels of NO x and SO 2 are at high risk of causing serious photochemical pollution (Ma et al, 2012;Cho et al, 2017) and are legally removed using the selective catalytic reduction process (SCR) in wet flue gas desulfurization systems (Mukherjee et al, 2016;Gingerich et al, 2018), accompanying the discharge of flue gas desulfurization wastewater (Solińska and Bajda, 2022).…”

“…Consequently, coal-fired flue gas is discharged, alongside the release of NO x and SO 2 from the burning of N/S-bearing impurities in coal (Cho et al, 2017;Conidi et al, 2018). These levels of NO x and SO 2 are at high risk of causing serious photochemical pollution (Ma et al, 2012;Cho et al, 2017) and are legally removed using the selective catalytic reduction process (SCR) in wet flue gas desulfurization systems (Mukherjee et al, 2016;Gingerich et al, 2018), accompanying the discharge of flue gas desulfurization wastewater (Solińska and Bajda, 2022). This wastewater is highly saline, and legal regulations require it be treated and completely recycled in an SCR system without any discharge (Conidi et al, 2018;Anderson et al, 2021;Solińska and Bajda, 2022).…”