关键词: 磨损, 颗粒, 流化床, 固定床

Abstract: The cold model experiments on the attrition of activated carbon particles were conducted in a steel-made coupled fluidized and fixed bed reactor with a diameter of 50 mm at 130~150℃. The relationship between the weight loss of particles (4.2 mm in diameter, cylinder-like particles) at the fixed bed section and gas velocity was analyzed. The fine particles (0.2 mm in average size, pristine) of fluidized bed reactor, remained in the fluidized bed, fixed bed and the filter after fluidization, were studied thoroughly to understand their profiles of particle size and their mass ratio in different positions under different gas velocities. It was found that the attrition of particles was serious. Under the high gas velocity (0.212~0.424 m/s), the weight loss of particles in the fixed bed was 3%~4%, and the mean size of fine particles in the fluidized bed was reduced from 200 mm to below 100 mm.

Key words: attrition, particles, fluidized bed, fixed bed