To meet the requirements for fast and efficient gas-solid separation at the outlet of a gas-solid concurrent downflow fluidized bed(downer),a new horizontal gas-solid rapid separator was designed based on the joint action of centrifugal and inertial forces.Under the same experimental conditions,a fluid catalytic cracking(FCC)catalyst was used as the material(with a particle density of 1500 kg/m3 and a mean particle size of 45.8μm)to experimentally investigate the effects of the insertion length of gas outlet pipe,the bypass cylinder,the gas outlet direction,and the secondary separation structure on the separator performance.The results showed that with an inlet gas flow rate of 14.5 m/s and a gas phase solid content of 60―835 g/m3,the downer system achieved a gas-solid separation efficiency of above 99.5%,with the separator’s pressure drop within 1846 Pa(when the separator included a bypass cylinder and a secondary separation structure with a proper insertion length of gas outlet pipe).
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