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以 16m高循环床提升管中气固两相流压力梯度的大量实验数据为基础 ,从能量耗散的观点分析研究了平均颗粒浓度的轴向分布特征及其操作条件的影响 ,并与相同条件下 6m高提升管中颗粒浓度的轴向分布进行了对比。结果表明 ,增加颗粒循环量Gs 或减小表观气速Ug 时 ,由于单位质量颗粒加速和输送的能量减少 ,提升管各高度位置的颗粒浓度εs增大 ,颗粒浓度的轴向分布亦更不均匀 ;提升管高度对平均颗粒浓度及其轴向分布具有显著影响 ,提升管高度增加 ,提升管各高度截面上的平均颗粒浓度减小 ,颗粒浓度的轴向分布也更加均匀 ,给定表观气速对应的颗粒饱和夹带量也将提高。
Based on a large amount of experimental data of the pressure gradient of gas-solid two-phase flow in a riser with a height of 16 m, the axial distribution of average particle concentration and its operating conditions were analyzed from the perspective of energy dissipation and compared with the same conditions The axial distribution of particle concentration in the 6 m high riser was compared. The results show that when the particle circulation rate Gs is decreased or the apparent air velocity Ug is decreased, the particle concentration εs increases at each height position of the riser due to the acceleration and transportation energy per unit mass of particles, and the axial distribution of the particle concentration is even less Uniform; riser height has a significant effect on the average particle concentration and its axial distribution, the riser height increases, the average particle concentration decreases at each height cross section of the riser, and the axial distribution of particle concentration is more uniform. Given the apparent The gas saturation corresponding to the amount of particles will also increase.