Experimental Study on Particle Concentration Attenuation Coefficient in the Riser of a Circulating Fluidized Bed

Based on the established circulating fluidized bed (CFB) cold test platform with 20 m ultra-high riser, quartz sand was used as the bed material to systematically analyze the effects of particle size, fluidization velocity, and riser pressure drop on the particle concentration distribution in the transition zone and the dilute phase zone. Results show that in the transition zone, the attenuation coefficient of particle concentration is inversely proportional to the pressure drop and fluidization velocity, and directly proportional to the bed material size. While in the dilute phase zone, the attenuation coefficient is inversely proportional to the fluidization velocity and directly proportional to the particle size.