| Spray Dryer Absorber(hereinafter referred to as SDA)is a semi-dry desulfurization technology which is widely used in the steel industry.It has the advantages of low operating cost,small cover area,high desulfurization efficiency,no liquid waste and desulfurization products easy to processing.It is very important to optimize the SDA tower design for improving its desulfurization efficiency and achieve ultra-low emissions.In this paper,CFD method is used to analyze the flow field in the desulfurization tower.Based on analysis and comparison of various parameters in the desulfurization tower,several improved design is proposed.Firstly,the optimal inlet flow ratio of two inlets without the baffle in the tower is determined.The variation trend of the flow field in the tower under different inlet flow rates is analyzed.Several different baffle arrangements were presented to measure its influence on the desulfurization efficiency.Several kinds of the tower modification schemes were tested,and its own set of advantages and disadvantages were carefully analyzed.Then,a more feasible arrangement scheme of the central air inlet baffle is proposed.The advantages and disadvantages of different baffle arrangements are analyzed in detail.Finally,the grid-shaped air deflector is selected.This baffle can distribute the central flue gas,which helps to optimize the gas-liquid mixing and improve the desulfurization efficiency.Finally,explored several parts of desulfurization tower which is easy to abrasion and tear.It is found that the flue gas flow pressure variation in these places is large,and many possibility problems are predicted.According to the simulation results,several reconstruction schemes and preventive measures will help to reduce the tower body wear and corrosion,a substantial reduction in desulfurization tower maintenance expenditures. |
PDF Full Text Request