Study on Mechanism of Evaporation Reduction of Desulfurization Wastewater in Air Cooling Tower
It's a new technology for the concentration and reduction of desulfurization wastewater by the indirect air cooling tower,and relevant research on its evaporation mechanism has been rarely published.In this paper,indoor experiments are conducted to explore the evaporation characteristics of the evaporation tower and the evaporation law of desulfurization wastewater in the filler and analyze the factors affecting the evaporation characteristics,and a power plant adopting this technology is tested to verify the conclusion of the indoor experiments.The results show that the evaporation rate of the evaporation tower is positively correlated with the cross-sectional wind speed,water spray density,packing height and other parameters,and the influence of the interrupted wind speed on the evaporation rate is the most significant.During the operation of the evaporation tower,the temperature of desulfurization wastewater in the evaporation tank fluctuates by less than 0.5℃,and it is close to the wet bulb temperature of the outlet air of the evaporation tower where the air is closely saturated.The difference in vapor pressure has a positive linear relationship with that of mass fraction of the air in inlet and outlet,and the results of the model test conform to those of the actual one basically.On the condition of a ventilation rate of 817.56 m3/s,the evaporation efficiency of a mechanical ventilation cooling tower with a drenching area of about 400 m2 can reach 16.2-18.4 t/h,which basically meets the engineering needs of desulfurization wastewater concentration and reduction in millions of thermal power plants.
Desulfurization wastewaterEvaporation towersEvaporation rateDifferential vapor pressureAir quality difference at import and export