Abstract
Circulating Fluidized Bed with gas-solid phases flow was set up in this paper. The gas and solid two phases flow and distribution of particle concentration in the tangential swirl/straight composite fluidized desulphurization tower was measured by Laser Doppler Particle Dynamic Analyzer(PDA). The results indicate that the axial velocity is high at the centre and low near the wall at the bottom of desulphurization tower, where the particle concentration has opposite situation, which forms typical annular-core flowing characters. At the range from 0.7R to 1.0R of the wall on the bottom of desulphurization tower, it forms stable rotational flow field and particle suspension layer. The space in the tower can be divided into three parts, straight flow zone at the centre, particle suspension zone and reflux zone close to the surface. The stable inner circulation of the materials generated. When swirl inlet is half closed, the circulation effect is reduced and the high concentration near the wall is decreased. With drop of the velocity inside, the particles settled obviously and its concentration increases.
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