Experimental Investigation of Solid Flow Pattern in Gas-Solid Circulating Fluidized Bed Riser

Abstract

Circulating fluidized bed (CFB) technology finds extensive applications across various industries, including petrochemical, chemical, fine chemical, metallurgical, and power generation. Its widespread use can be attributed to its exceptional heat and mass transfer capabilities, higher throughput rates, and operational versatility. CFBs are employed in various applications, each tailored to handle different levels of solid fluxes. Low-solid-flux CFBs are instrumental in processes such as drying, alumina calcination, and iron ore reduction. On the other hand, high-solid-flux CFBs are mostly used for fluid catalytic cracking (FCC), making maleic anhydride, burning gasifying coal and biomass, and chemical looping combustion, among other things. Although CFB has been in use for many decades, there is still a lack of fundamental knowledge. CFB is still designed empirically and scaled up based on experience rather than science. The complexity of gas-particle, particle-particle, and particle-wall interactions is primarily to blame for this. Geometry and scale have an impact on these interactions. There is a scarcity of detailed velocity flow field data especially in the case of Geldart Group B particles.