Abstract: In order to analyze the flow field characteristics in the rotating atomizing evaporation tower for desulfurization wastewater, establishing the numerical model based on CFD software, and verifying its reliability by hot state experiments. On this basis, taking the rotating atomizing evaporation tower of a 600 MW coal-fired unit as the research object, and simulating studies the influence of structure such as tower diameter, tower height and guide cone on the flow field characteristics in the tower. The results show that as the axial distance increases, the evaporation rate of droplets gradually decreases, the radial distribution range gradually widens, and the maximum and median particle sizes gradually decrease. The probability of hitting the wall in the lower part of the tower is greater than that in the upper part, and the area near the ash hopper has a significant increase, making it a relatively easy area for scaling. Within the design scope, the diameter and height of the tower have a relatively small impact on the evaporation process of droplets, and appropriately reducing the diameter and height of the tower can reduce the probability of product wall collision. When there is no guide cone, the guide device is prone to scaling, and the presence of the guide cone plays a role in gathering flue gas, but excessively high guide cones will incur higher resistance.