Numerical simulation of rotating spray evaporation characteristics of desulfurization wastewater

The evaporation process of desulfurization wastewater droplets was investigated based on the establishment of heat and mass transfer model for evaporation by reaction engineering approach(REA). The computational fluid dynamics(CFD) was employed in programming, simulation and calculation of the model. The model was applied in simulating the evaporation process of desulfurization wastewater from a 600 MW unit in a power plant. The influence of inlet flue gas temperature and wastewater treatment amount on the flow field and droplet evolution in the drying tower was studied. The results show that two obvious stages are observed during evaporation process, which are the stage of constant velocity and the stage of decreasing velocity. The inlet flue gas temperature affects the evaporation effect of droplet groups mainly by influencing the heat transfer process. The higher inlet flue gas temperature would lead to the higher average temperature along the drying tower. The wastewater treatment amount makes an appreciable difference in the mass transfer process, accounting for the impact on evaporation effect of droplet groups. With the increase of the wastewater treatment amount, the humidity in the tower grows higher. © 2022 Central South University of Technology. All rights reserved.