Abstract: Based on a cold model experimental setup of riser reactor with combined restraint outlet, an experiment was conducted to analyze pressure drop of gas-solids distributor at the outlet of riser under different circumstances. Gas-solids distributor's pressure drop increased with increasing superficial gas velocity and solids flux, with or without active operating bed. The slope of gas-solids distributor's pressure drop curve increased with increasing superficial gas velocity at lower solids flux, while decreased at higher solids flux. Pressure drop of the distributor declined with increasing distributor's aperture ratio and increasing pressure drop of the upper fluidized bed. When the pressure drop of the upper fluidized bed increased to a specific value, the holes of the distributor were all able to be passed through by gas-solids flow, with the distributor pressure drop approximately unchangeable. At the same superficial gas velocity, pressure drop of gas-solids distributor was bigger than that of conventional gas distributor.

Key words: fluidized-bed, riser, exit constructure, gas-solids distributor, pressure drop

摘要： 在一套组合约束型提升管冷态实验装置上，通过实验研究了不同操作条件下提升管出口气固分布器的压降，并与常规气体分布器压降进行了对比。实验结果表明，在零床层及有床层的操作模式下，气固分布器压降均随提升管内表观气速和颗粒循环强度的增加而增大，在颗粒循环强度较低时，气固分布器压降曲线变化的斜率随着表观气速的增加而增大，在颗粒循环强度较高时，气固分布器压降曲线变化的斜率随着表观气速的增加而减小；随着开孔率及上部流化床层压降增加，气固分布器压降呈降低趋势，当流化床层压降达到一定程度后，分布器各孔方可实现有效布气，此后气固分布器压降趋于近似不变；在相同表观气速及开孔率下，气固分布器压降大于常规气体分布器压降。

关键词: 流化床, 提升管, 出口结构, 气固分布器, 压降