Riser has the advantage of high gas-solids contact efficiency,high gas/solids flux and so on.But there is relatively significant gas and solids backmixing.On the ether hand,downer has the great advantage of uniform ga...
A riser with high density has unique behavior as compared with conventional circulating fluidized bed. With increase of cross-sectional solids fraction, the radial profiles of solids fraction,and particle velocity bec...