Gas-solid flow on composite fluidization of swirl-once through flow in CFB-FGD

Abstract:

The authors brought forward composite fluidization structure against the problems in the CFB-FGD.Axial swirl vanes,which formed the composite fluidization of swirl-once through flow,were installed in the venturi.The characteristics of gas-solid flow at cold state were discussed through experiment and simulation.The comparison between the composite fluidization and the once-through fluidization was carried out.As a result,the composite fluidization mode is nonuniform air distribution mode.Its tangent velocity is larger than that of the once-through fluidization,which results in the longer particles residence time,higher particles concentration,stronger fluctuation,and better capability of diffusion and mixture.The uniformity is improved and can be achieved more quickly,which improves the flow field in the composite fluidization.