Effect of intake kinetic energy dissipation on dust sedimentation and bag life of pulse-jet bag filter
In order to improve the settling efficiency of dust particles and the service life of the bags in pulse-jet bag filter,the intake duct structure was optimized based on the concept of kinetic energy dissipation.The impact of intake kinetic energy dissipation on the internal flow field of the pulse-jet bag filter was studied by using numerical simulation methods.The Discrete Phase Model was employed to evaluate the motion states and settling efficiency of dust particles in the bag filter.The results indicated that the flow field of the modified pulse-jet bag filter was more stable.The maximum airflow velocity at the bottom of the hopper decreased from the original 19.2 m·s-1 to 9.6 m·s-1,and the maximum airflow velocity at the bottom of the middle casing decreased from the original 24.4 m·s-1 to 9.3 m·s-1.There was no significant difference in equipment resistance before and after the modification.Comparisons of the settling rates of dust particles with different diameters revealed that the settling rates of dust particles with diameters of 100,150,200,250 and 300 μm increased by 11.4％,38.9％,59.6％,69.0％and 71.6％,respectively,after the modification.The results indicated that the dissipation box structure,by reasonably consuming the kinetic energy of the intake air,reduced the gas kinetic energy in critical areas of the device.Thereby,it can inhibit the dust which is blown up repeatedly and weaken the impact of dusty gases on the bags.The numerical simulation results can provide theoretical basis for the flow field design of pulse-jet bag filter.
pulse-jet bag filternumerical simulationkinetic energy dissipationbag lifesettling efficiency
万方数据
维普
