Application progress of zero discharge technology for desulfurization wastewater in coal-fired power plants

Polaris Water Treatment Network News: Abstract: At present, the flue gas desulfurization process of coal-fired power plants is mainly wet desulfurization, which will produce a certain amount of desulfurization wastewater. The article introduces the water quality characteristics and treatment process of desulfurization wastewater, and conducts technical feasibility analysis and economic comparison for mainstream technologies such as membrane concentration reduction, evaporation concentration crystallization, main flue evaporation and bypass flue evaporation processes, and looks forward to the development prospects of zero-emission technology for desulfurization wastewater in coal-fired power plants.

With the continuous improvement of national environmental protection requirements and pollutant emission standards and the proposal of carbon peak and carbon neutrality development goals, the clean and efficient use of coal has been promoted. Due to China's energy distribution characteristics and reserves, coal-fired power generation still occupies a dominant position. The mainstream flue gas desulfurization process of coal-fired power plants is wet desulfurization [1]. The chloride ion concentration in the desulfurization tower (<20000 mg/L) is the basic guarantee for the flue gas sulfur dioxide emission to meet the standard (35 mg/m3). Therefore, the desulfurization process needs to be regulated by discharging desulfurization wastewater [2-3]. The release of "Design Specification for Wastewater Treatment of Power Plants DL/T 5046-2018" standardizes the discharge requirements of wastewater, strengthens the treatment technology, and fully guarantees the realization of the zero emission goal. In response to the discharge requirements of desulfurization wastewater, experts and scholars continue to explore solutions [4-5], analyze a large number of power plant operation results and the current status of treatment technology research [6], and propose several mainstream desulfurization wastewater treatment technologies, but further practical tests are still needed.

• Prev：no more
• Next：no more