The Simulation On The Flow Field And The Study On Scaling Of WFGD Spraying-tower

More and more attention has been paid on the atmospheric caused by thermal power plants in our country. This paper studies the impact of different parameters on the desulphurization efficiency and scale. The value of pH changes between 5.2～5.6; When the calcium sulfur ratio less than 1.18, the operating system can be steady running. Improving Mg2+ and Na+ concentration can relieve the occurrence of scaling.Now as a kind of most mature technique of the flue gas desulfurization, the WFGD technique has been widely used. But in the actual operation, scaling affects the stable operation of the equipment. The gas-liquid two-phase flow in the towers is numerically simulated by using of Fluent. This article uses the Gambit software for modeling and meshing. The k-s Model, Discrete Phase Model, Porous Medium Model are applied to numerically calculate the three-dimensional flow field and temperature field through the software of Fluent. This paper discusses the impact of different load conditions, flue gas entrance inclination angle on flow field, temperature distribution and scaling.Simulation results showed:slurry spraying can bring integration to flue gas flow field in spray tower. Lean inlet can make the gas flow evenly, but the tilt angle should not be too large, better than 15°. Simulation of the flow field in tower before and after scaling, scale of demister caused flow instability and vortex increasing.Finally, some reasonable suggestions for the optimization design of the absorber are given.According to the simulation, the results summarized scaling hazard, and presented the control measures.