Experimental And Numerical Simulation Study On The PCF Type Wet Desulfurization Dust Catcher

On the base of rebuilding the ordinary Granite water film dust collector, PCF wet desulfurization dust catcher was designed by Environmental Science and Technology college of Hunan University, which has a simpler structure, higher desulphurization and dust removal efficiency and gas processing capacity.In this paper, both the method of experimental and numerical simulation was used to research the PCF device. Software FLUENT6.3was used to simulate the gas flow and gas-liquid two-phase flow in the PCF wet desulfurization dust catcher to analysis the gas-liquid two-phase distribution characteristics of the device as well as the influence of the deflectors and the self-excitation channels. RNG κ-ε model was used to simulate the continuous, while Discrete Phase Model (DPM) was used for particle trajectories determination, SIMPLEC algorithm was selected for the velocity-coupled pressure. The profile of gas velocity、pressure drop、turbulence intensity and the concentration of liquid particles were analyzed, the flow field of PCF device with different structures were compared.The results show that the deflectors enhanced the turbulence of the flow, provide gas-liquid contacting area, extend the gas-liquid contacting path, and promote mass transfer reaction between gas and spraying liquids. The deflectors and the self-excitation channels are the main cause to the device pressure drop. The turbulence intensity was most intense around the deflectors and the self-excitation channel, which have structure that is more complex. On the base of self-excitation channel, the concentration of liquid droplet is highest. The direction of Flue gas in the inner tube was opposite to the outer ones. PCF’s sleeve structure can effectively reduce the water in the outlet flue gas, and then the mist eliminator can omitted, make the structure simpler. Furthermore, the simulation results are of major significance for the optimization design and practical tower operation. The trend of velocity and pressure in the device were same as the structure of the self-excitation was changed, while the value has some different.The simulation results were compared to experimental results, the profile of the outlet velocity when the ratio of liquid to gas was1L water/m3gas was compared to the data obtained by experiment. The pressure drop of the device under different inlet velocity was also compared to the experimental data. The results both show good agreement with the experimental ones, indicating that the simulation results are reliable.