Study on the Influencing Factors in the Desulfurization Wastewater Treatment Process of Thermal Power Units
The combustion exhaust gas of thermal power plants must undergo desulfurization and deni-trification before it can be discharged,and the desulfurization processes vary between domestic and in-ternational power plants.This article summarizes the sulfur-containing wastewater treatment process-es in thermal power plants both domestically and internationally,compares and studies the influencing factors of the evaporation process,and analyzes the advantages and disadvantages of current pro-cesses.Controlling chloride ion concentration in wastewater primarily involves adjusting the wastewa-ter's pH level,and integrating electrolytic chlorination technology to enhance efficiency.The current process of using flue gas as a heat source for the evaporation of desulfurization wastewater relies heavily on temperature,with wall hanging occurring below 315℃.The selection of evaporation process should be combined with geographical environment.In the eastern region,multiple membrane treat-ment processes are mainly used in combination to achieve zero emissions as much as possible.The western region utilizes the characteristics of abundant sunshine and dry climate for natural evaporation.In response to the problem of water resources being unable to be recycled due to wastewater evapora-tion,in arid and semi-arid areas,the combination of steam mechanical recompression falling film evap-oration crystallization and flue gas bypass evaporation technology is adopted,or the low-temperature flue gas vacuum evaporation at the tail of the power plant is used to expand the capacity of the evapo-rated water vapor and convert it into distilled water for reuse to solve the problem of water recycling.An analysis was conducted on the impact of evaporation method on flue gas and system pipelines,com-bined with traditional triple box technology.Based on local conditions,an acceptable cost method was selected for treatment to meet current needs.However,further research is needed to achieve zero dis-charge of desulfurization wastewater in the entire thermal power industry.