上行气固两相流充分发展段的摩擦压降

为确定气固提升管充分发展段的摩擦压降及其对颗粒浓度测试的影响，提出了充分发展段内气固两相流与管壁间摩擦压力降的计算模型，由此获得充分发展段内真实颗粒浓度的计算公式；同时在两套提升管实验装置上对压力梯度分布和局部颗粒浓度进行了系统测试和对比分析。结果表明，用压差法测试颗粒浓度时摩擦的影响不可忽略，尤其是在气速较高(Ug＞8 m/s）时，表观浓度比实际浓度高出30%～50%；采用建立的模型对表观浓度进行修正，获得的预测值与实际颗粒浓度吻合良好。

The Predictions of Pressure Drop and Solids Holdupin Fully Developed Region of CFB Risers

To investigate the pressure drop due to the friction between gas-solid suspension and CFB riser wall and its effect on the measurement of average solids holdups by pressure transducers, modeh for predicting the pressure drop and the solids holdup were developed. Experiments were eamied out by using FCC and sand particles in two CFB risers with 15.1 m and 10.5 m high,respectively.By comparing the apparent solids holdups obtained form the pressure gradients and the actual solids holdups,it was found that the filet/on cannot be omitted when the pressure gradients are converted to the solids holdups, since the friction causes a deviation of the apparent solids holdup from the actual one. When the superficial gas velocity h above 8 m/s, the deviation reaches up to 30% - 50%. The modeh yidd the predicted results in good agreement with the experimental data.