A Cold Experimental Research On The Cyclone Separator For High Solids-gas Ratio

An experimental investigation program has been carried out into a cyclone performance operated at high solids-gas ratio condition. Optimizations of the structure and operating parameters for the previous cyclone separator enabled it to work stably with high solids loading. Meanwhile, the influences of cylinder length, inlet velocity and high inlet solid concentration on the cyclone pressure drop were discussed. On the basis of experimental results, well-matched parameters were given and a new pressure drop calculation model well suitable for the cyclones at high inlet solid concentration (0~2.0kg/kg) was set up.Moreover, this thesis has preliminarily studied on the dispersion of the material in the elevating tube, measured the relative changes of dust concentration in the elevating tube of cyclone by using PV4A Particle Velocity Analyzer, and compared with various conditions of fixed spreading plate or unfixed one, as well as the conditions of two plates with different vane angle.The results show that pressure drop deceases with increased solid loading under the proper operating conditions only for the specially designated cyclones. It's found that the cyclone separators whose ratio of cylinder length to diameter at the range of 1.0-2.0 have good performances at an inlet flow velocity from 18 to 24m/s.New model to predict the pressure drop of cyclones is suggested by modifying Barth method. Comparing with the former calculation models, the new model considers factors more all-sidedly, including the geometry of inlet, cylinder length and solids-gas ratio, etc.. There is a good agreement between calculation results andexperimental data.By fitting a spreading device, the dispersion state of material in the elevator tube was signification promoted and the type of B spreading plate with an angle 45° gave more desirable performance than type A with an angle 60° inclined from horizontal level for high solids-gas ratio cyclone.