The article discusses how coal-fired power plants can cause environmental pollution and the different methods of flue gas desulfurization used internationally. It focuses on the dosulfurization processes for circulating fluidized bed boilers and limestone-gypsum flue gas desulfurization for coal-fired boilers at the SPC Thermal Power Plant. The article provides details on the systems, flow, and equipment used in these processes, offering valuable information for power plants looking to implement flue gas desulfurization.