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为了掌握操作条件对流化床射流区域颗粒浓度分布的影响,应用光纤颗粒浓度测量系统,对直径为1 m的半圆射流流化床射流区域颗粒浓度分布进行了考察,以聚苯乙烯颗粒为物料研究了不同操作状况(环管气速,射流气速和分布板气速)对流化床射流区域时均颗粒浓度分布的影响,分析了不同操作工况下颗粒浓度分布变化的规律.结果表明:在3种气速共同作用下射流区域颗粒浓度在径向上逐渐增大,在轴向上随着气泡的逐渐增大到崩塌其颗粒时均浓度逐渐降低.由于射流气速增加导致射流深度增加,继而固体颗粒的循环速率增大,射流区颗粒的体积浓度随射流气速的增加先降低后增大.随着分布板气速的增加射流区域时均颗粒浓度增大,环管气速增加其射流区颗粒浓度逐渐降低.
In order to understand the influence of operating conditions on the particle concentration distribution in the fluidized bed jet, the particle concentration distribution in the semi-circular jet fluidized bed jet with the diameter of 1 m was investigated by using the optical fiber particle concentration measuring system. The polystyrene particles The influence of different operating conditions (loop gas velocity, jet velocity and distribution plate gas velocity) on the distribution of average particle concentration in the fluidized bed jet was studied, and the variation of particle concentration distribution under different operating conditions was analyzed. : The particle concentration in the jet area gradually increases in the radial direction under the action of three kinds of gas velocities, and gradually decreases with the increase of the bubble in the axial direction until the particles collapse. As the jet velocity increases, the jet depth increases , And then the circulation rate of solid particles increased, and the volume concentration of particles in jet zone decreased first and then increased with the increase of jet gas velocity.With the increase of gas velocity in distribution plate, the average particle concentration increased and the gas velocity increased Its jet zone particle concentration gradually decreased.