中文摘要：

在平方的高密度 CFB 的起床人的煤气固体的流动特征(0.27 m

英文摘要：

The gas-solid flow characteristics in the riser of a high density CFB of square （0.27 m×0.27 m×10.4 m） or circu- lar （Ф0.187m×10.4 m） cross section, using Geldart B particles （quartz sand）, was investigated experimentally. The influence of riser structure on the hydrodynamic behaviors of a high-density circulating fluidized bed was investigated. The solid circulation rate was up to 321 kg/（m^2s） with the circular cross-section under the operating conditions of the main bed air velocity 12.1 m/s and loosen wind and back-feed wind flow 25.1 m^3/h. Different operating conditions on realizing high density circulation was analyzed, while both solids circulation rate and particle holdup depended highly on operating conditions. The circulating gas-solid flow was accompanied by an evidently-dense character in the riser＇s bottom zone and became fully developed in the middle and upper zones.