Numerical Simulation On Entrance Angle Optimization And Flow Field Of The Umbrella Plate Dust Removal And Desulfurization Tower

Spray tower can remove the particles and SO2from the flue gas effectively, whichis the most widely used gas desulfurization equipment in the wet flue gasdesulfurization system. With the increasingly stringent SO2emission standards and thedevelopment of the domestic gas desulphurization technology, the shortcomings of thetraditional spray tower, such as low efficiency of dust、poor desulfurization effect aregradually revealed. The traditional spray tower cannot meet the increasingly stringentflue gas emission standards. The umbrella plate dust removal and desulfurization toweris a new dust removal and desulfurization equipment, was invented on the basis of thetraditional spray tower. It has the advantages of small pressure loss, high efficiencydust removal, excellent dewatering performance, can effectively remove the harmfulgases such as SO2.Based on ANSYS Fluent software, the umbrella plate dust removal anddesulfurization tower has been simulated. The entrance angle of tower is optimized atfirst, selecting the optimal one. Then on the basis of optimal entry angle,Euler-Lagrange method is used to describe the gas-liquid phase, the continuous gasphase is considered by Euler framework, while the dispersed liquid phase with aLagrangian approach. The standard k-epsilon turbulence model and SIMPLE algorithmare applied in the simulation. Considering droplet breakup, atomization and the heatand mass transfer between gas and liquid phase, the spray flow and temperature field inthe spray tower has been computed, while the change of gas temperature and watervapor content has been obtained.The flow field distribution of the flue gas in the umbrella plate dust removal anddesulfurization tower with different inlet angle has been simulated. The numericalsimulation shows that the entrance angle of umbrella plate dust removal anddesulfurization tower have an important effect on the resistance of the tower, theuniformity of the flue gas, flue gas flow field and the turbulence intensity. With theentrance angle of9°and12°, the flue gas velocity near the wall of the tower increasedto3.5m/s-4m/s, the flue gas distribution becomes more uniform. With the entranceangle of9°, flue gas turbulence intensity is high and uniformly distributed. Therefore,we selected9°as the optimal entrance angle of the umbrella plate dust removal anddesulfurization tower.Numerical simulation results of the spray flow and heat transfer in the umbrellaplate dust removal and desulfurization tower show that: the heat and mass transfer occurs mainly in the area upper the umbrella cover and below the nozzle; the uniqueumbrella shape promote the breakup and atomization of the liquid droplet, and theform of liquid film; the droplet concentration in the umbrella plate area is higher thanother areas and uniformly distributed; when the spray time increased to0.1s, flue gasstriker after the spray liquid cooling has reached the export of the umbrella plate typedust removal and desulfurization tower, the water vapor content and temperature of theflue gas have stabilized at about385k and8%. Numerical simulation accuratelypredicted the spray flow and heat and mass transfer characteristics in the tower, whichwill provide guidance for the further optimization of the device design and practicalengineering applications.