Energy Dissipation Distribution in a Draft Tube-lifted Gas-Solid Air Loop Reactor
中心气升式气固环流反应器中的能耗分布

Based on the energy balance,an energy dissipation rate model of different regions of a draft tube-lifted gas-solid air loop reactor(GSALR) was established.The local particle velocity,bed density and pressure drop were measured in a cold model GSALR and the model parameters were obtained based on the experimental data.The predictions agree with experimental data.The predicted results show that nearly 40% and 30% of the energy dissipation rate occur in the annulus and gas-solid separation regions,while that in the draft tube and gas distributors region is relatively small,reaching a sum of nearly 30%.With increasing of the draft tube gas velocity,the ratio of individual region to global reactor energy dissipation rate decreases for the annulus region,increases for the gas-solid separation region,and basically remains constant for the draft tube and gas distributor affecting regions.Compared with that obtained in an annulus-lifted GSALR,the location of gas distributor has a significant influence on energy dissipation,the flow resistance is smaller in the draft tube-lifted GSALR.