Researches Of Control And Mechanism On Desulfurization Wastewater Evaporation

Along with economic level rising in, electricity demand is growing, and our country is given priority to with coal energy consumption structure is difficult to change in the short term, so the coal fired power plant is still dominant. Gas pollutants such as sulfur dioxide from the burning of coal is the main source of air pollution problem in our country, in most power plants wet limestone-gypsum flue gas desulfurization(FGD) technology is applied most widely, and also have a good desulfurization effect. But this technology must discharge desulfurization wastewater, but at present, the traditional way of desulphurization wastewater treatment cannot meet the demand of the power plant, especially with the new environmental laws officially implemented in January 1, 2015 and enacted water pollution prevention action plan in April 2015, which is called “Water Ten”, wastewater discharge faces increasingly stringent environmental requirements, how to implement the desulfurization wastewater zero emission has become a big problem faced by the electric power industry. Because of the flue gas desulfurization wastewater treatment problem, this paper puts forward a new way of desulphurization wastewater treatment, the desulfurization wastewater after compressed air atomizing spray into the high temperature flue which is behind air preheater, use of flue gas waste heat evaporates wastewater droplet, and boiled salts are removed by precipitator system,both use the waste heat of flue gas in order to realize the energy saving, and the desulfurization wastewater is effectively treated, realizing the zero discharge of wastewater.Based on the laboratory experiment and computer simulation, this paper studies the key technique in the desulfurization wastewater evaporation, based on small wastewater evaporation simulation experiment platform, mainly studied the flue gas temperature, velocity of flue gas and wastewater flow rate and the initial temperature of wastewater, the nozzle compressed air mixed with the wastewater of gas liquid ratio and other factors affect the performance of wastewater evaporation, Compares the evaporation effect of single and two-fluid nozzle, downstream and upstream injection. Different characterization methods and testing methods(EDS XRD SEM, etc.) is used on the research of microstructure and composition change of salt left after dry desulfurization wastewater, and study its resistivity change, discusses the impact on precipitator system, expounds its corrosion mechanism through corrosion test.at the same time, use the CFD simulation technology, SolidWorks is used to create model and the Gambit, ICEM CFD are used to generate mesh, using CFD software FLUENT for desulphurization wastewater evaporation process of numerical simulation, studied the influence of nozzle arrangement, atomized droplet diameter, flue gas temperature and flue gas velocity on the evaporation effect. This topic research for coal-fired power plant desulfurization wastewater zero discharge treatment provides a new train of thought, for desulphurization wastewater evaporation technology laid a theoretical foundation for engineering applications.