Experimental Study on Flow Behavior in a Gas-Solid Fluidized Bed for the Methanol-to-Olefins Process

摘要

A cold model experimental system is established to investigate the flow behavior in a gas-solid fluidized bed for the methanol-to-olefins process catalyzed by SAPO-34. The system comprises a gas distributor in a F300x5000 mm acrylic column, double fiber optic probe system and a series of cyclones. The experiments are carried out under conditions of atmospheric pressure and room temperature with different superficial velocities (0.3930-0.7860 m s~(-1)) and different initial bed heights (600-1200 mm). The effects of radial distance, axial distance, superficial gas velocity, and initial bed height on the solid concentration and particle velocity in the bed are discussed. The time-averaged solid concentration and rising particle velocity profiles under different conditions are obtained. The results show that an increase in the value of r/R or initial bed height results in an increase in the solid concentration but a decrease in the rising particle velocity in the dense phase area, while improvement of the superficial gas velocity has a negative influence on the solid concentration but results in an increase in the rising particle velocity.