Numerical Simulation Of Temperature Field And Fluid Field Within Mechanical Rotary Blowback Bag Filter

Bag filter is a main tool for recovery of fine dust, with the improvement of environmental requirements, the bag filter is and remains to be widely used. Mechanical rotary blowback bag filter is the organic combination of bag filter and cyclone dust collector, which not only can reduce the system covering area and resistance, but will also save connection pipe so as to achieve the purpose of saving energy.Dusty gas movement is a kind of complex three-dimensional gas-solid flows in the mechanical rotary blowback bag filter, which makes internal flowing test becoming more difficult. This topic uses computational fluid dynamics software Fluent, selects the RSM model, simplifies calculation model by applicating the theory of porous media, sets the speed inlet and free outlet boundary conditions, gets temperature contours, pressure contours, velocity contours, turbulence intensity distribution of cloud images, particle trajectory and the curve of filter bag clearance air rising velocity. From analysis, this paper can get conclusions that the high-pressure zone occurs in the filter chamber inlet because of its higher velocity; the area of low-pressure occurs in the net chamber outlet because of its lower velocity. The pressure of dusty gas happens to stepped through the bag before and after, because the penetration rate is very small. The air rising velocity of filter bag clearance changes smoothly and tends to uniformity, which benefits to the sedimentation of particles of just off from the bag by reverse blowing, so as to decreases the settling time and improves the efficiency of dust removal. From changing the filter velocity, inlet velocity, the height of inlet and the ratio of depth-width, comparative analysis by contours show that these parameters have significant effect on bag filter internal temperature field, pressure field and velocity field. The filtration rate and inlet velocity increasing have a serious impact on the total pressure loss; the flow distribution coefficient curve also show that:the filtration velocity and inlet velocity is more increase, the flow distribution of bag filter is more inhomogeneous, the result after the comparative analysis is that:the lower filtration velocity and inlet velocity are benefit to the uniformity of flow distribution. The figures of particle trajectory show that:the particles' decrease in the movement of the second lap in filter chamber are more frequently, most of them settle to ash bucket by the action of gravity and centrifugal force, this is the role of cyclone structure, filter bag capture only a small portion of particles in the rotary air inclusions.