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The solids acceleration length was investigated in a cold dense transport bed(0.10m-ID×17m-height)with three kinds of silica sand.The solids circulation rate(Gs)was up to 954 kg/(m2s).The effects of operating conditions,particle properties,and riser structures on the solids acceleration length were investigated under high Gs conditions,with the effect of riser height non-negligible.The solids acceleration length increased with the increase of the riser height.Based on the experimental data,an empirical correlation was proposed to predict the solids acceleration length.Predictions of the correlation were in good agreement with the experimental data in this work and those from the literature over a wide range of Gs(18～954kg/(m2s)).
The solids acceleration length was investigated in a cold dense transport bed (0.10m-ID × 17m-height) with three kinds of silica sand.The solids circulation rate (Gs) was up to 954 kg / (m2s). The effects of operating conditions, particle properties, and riser structures on the solids acceleration length were investigated under high Gs conditions, with the effect of riser height non-negligible. These solids acceleration length increased with the increase of the riser height. Based on the experimental data, an empirical correlation was proposed to predict the solids acceleration length. Predictions of the correlation were in good agreement with the experimental data in this work and those from the literature over a wide range of Gs (18-954 kg / (m2s)).