Numerical Modeling for Bag Filter Device Based on Secondary Development of Fluent Software
In order to overcome the shortcoming of traditional Porous Jump model in confusing fluid turbulence inside and outside the bags,with the filtration velocity of filter bags calculated by the Darcy seepage theory,a novel numerical model of high precision was proposed for the flue gas flow field in filter bag device through the secondary development of Fluent software.The bag filter with a lateral inlet of a power plant boiler in Wuhan Iron and Steel Co.Ltd.was simulated with the novel model,and the seepage flow distribution among bags was studied with the physical field contours.Besides,the comparison against the traditional Porous Jump model was performed.The results show that the proposed novel model,treating the bags as a wall with a mass source or sink on its two sides,takes the influence of filter bags on turbulence development into full consideration and reproduces the real turbulent flow in the filter-bag zone,resulting in that the infiltration behavior of filter bags is correctly reflected.In addition,with the combination of porous windward baffles and side guide plates,the studied filter device is observed to take a good flow distribution among different filter bags,with the relative deviation of less than 3.5％.It is concluded that the proposed model provides a new choice for numerical simulation of flow field in bag filter.
bag filter deviceseepage uniformityturbulence flownumerical simulationfluent secondary development
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