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首页> 外文期刊>The Canadian Journal of Chemical Engineering >Experimental investigation of hydrodynamics of gas-solid flow in an internally circulating fluidized bed
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Experimental investigation of hydrodynamics of gas-solid flow in an internally circulating fluidized bed

机译：内循环流化床中气固两相流动力学的实验研究

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Hydrodynamic study of gas and solid flow in an internally circulating fluidized bed (ICFB) is made in this paper using a high-speed camera and pressure probes for the laboratory 0.3m x 0.27m column having an internal draft tube. Experiments were conducted using sand particles of Geldart B and Geldart B-D groups. At each run the standard pressure-flow curves for both the draft tube and annular region beds, and the moving wall particle velocity in the annular bed region were measured. The effects of superficial gas velocity, static bed height, and draft tube gap height on pressure drop profiles, solid circulation patterns, and gas bypassing dynamics for the ICFB were investigated extensively. Unlike the conventional CFB, the pressure drop in ICFB is further decreased with superficial gas velocity after the minimum spouting fluidization, followed by yielding a cross-over in the pressure drop of the annular bed compared to the draft tube. Pressure drop in the draft tube increases with an increase of static bed height and gap height between the draft tube bottom and the air distributor. The gas bypassing fraction increases with an increase in gap height and decreases with increased bed height and mean particle size. The mechanism governing the solid circulation and the pressure losses in an ICFB has been elaborated based on gas and solid dynamics obtained from the experimental data.
机译：本文使用高速摄像头和压力探头对带有内部导流管的实验室0.3m x 0.27m色谱柱进行了内部循环流化床（ICFB）中气体和固体流的流体动力学研究。使用Geldart B和Geldart B-D组的沙粒进行实验。在每次运行时，都对引流管床和环形区床的标准压力-流量曲线以及环形床区中的移动壁粒子速度进行了测量。广泛研究了表观气体速度，静态床层高度和引流管间隙高度对ICFB的压降曲线，固体循环模式和气体旁路动力学的影响。与常规CFB不同，在最小喷射流化后，ICFB中的压降会随着表观气体速度而进一步降低，随后与导流管相比，环形床的压降会产生交叉变化。引流管中的压降随固定床高度和引流管底部与空气分配器之间的间隙高度的增加而增加。气体旁路分数随间隙高度的增加而增加，随床高度和平均粒径的增加而减小。基于从实验数据获得的气体和固体动力学，详细阐述了控制ICFB中的固体循环和压力损失的机理。

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