The solids density and solids residence time in circulating fluidized bed increase with increasing solids circulation rate and reducing gas rate.
降低气速、提高颗粒循环速率，可以提高床内颗粒浓度，增加颗粒停留时间。
This high rate of heat transport is due to the bubble-induced circulation of solids.
这种高传热率是由于气泡所引起的固体颗粒循环所致。
It has been found that the pressure drop of the distributor has little influence on the axial apparent solids concentration in upper dilute region and on the external circulation rate.
研究同时发现，分布板压降对稀相区轴向颗粒浓度和颗粒循环量无影响。
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