流化床与固定床耦合反应器中的颗粒磨损

在直径50mm的冷模流化床与固定床耦合反应器中,考察了活性炭颗粒在130～150℃及不同气速下的磨损情况,得到了不同气速下固定床中圆柱状颗粒的磨损率随时间的变化关系,同时分析了滞留在流化床、固定床及袋滤器中的细颗粒在不同气速下的粒径分布与质量分布.结果表明,颗粒在该耦合反应器中磨损严重,在0.212～0.424m/s气速下,固定床中颗粒质量损失可达3%～4%,流化床中颗粒平均粒径由200μm降至100μm以下.

Attrition of Activated Carbon Particles in a Coupled Fluidized and Fixed Bed Reactor

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 free 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 s.tudied 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 μm to below 100 μm.