关键词: 环流反应器, 气固体系, 床层密度, 环流速度

Abstract: In order to overcome shortcomings of commercialized gas-solid draft tube-lifted air loop reactor, a novel gas-solid annulus-lifted air loop reactor (ALALR) was proposed. Experiment was conducted to investigate local bed density distribution. The circulation driving force increased with the increase of superficial gas velocity in annulus, but decreased with the increase of superficial gas velocity in draft tube, and even became negative when it reached 0.2 m/s. The bed density was influenced by configuration of ALALR and showed an ununiform radial distribution. The bed was not well fluidized below the draft tube (r/R≤0.47) with the bed density close to 820 kg/m3, but was well fluidized in the lower annular region (0.47≤r/R≤1.0) with the bed density lower than 450 kg/m3. When the superficial gas velocity in annulus increased from 0.2 to 0.54 m/s, the mean bed density in the annulus region and draft tube region decreased about 70 and 33 kg/m3, respectively. Interestingly, with the increase of the superficial gas velocity in draft tube from 0.06 to 0.2 m/s, the mean bed density increased about 90 kg/m3 in the annulus region, but decreased to about 33 kg/m3 in the draft tube region.

Key words: airlift loop reactor, gas-solid system, particle density, particle circulating velocity