Abstract Controlling the internal particle circulation rate quantitatively is of great importance to the operation of the internally circulating fluidized bed with a central draft tube used in the biomass gasification field. In this work, the effects of the operating parameters on the internal particle circulation rate were investigated on a laboratory experimental apparatus. The results indicated that the internal particle circulation rate increased with the increasing air velocity in the central draft tube, and gently increased with the air velocity in the annular bubbling bed. The internal particle circulation rate increased with the increasing initial static bed height in the annular bubbling bed and decreased with the increasing particle size. The correlation formula was obtained through the regression of experimental data. Furthermore, a dynamic prediction model was established based on the theory of fluid mechanics, and the matching degree between the predicted values and experimental data was larger than 80%.

中文翻译：

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带中心导流管的内循环流化床中颗粒循环率的预测

摘要 定量控制颗粒内循环速率对于生物质气化领域使用的带中央尾流管的内循环流化床的运行具有重要意义。在这项工作中，在实验室实验装置上研究了操作参数对内部粒子循环速率的影响。结果表明，内部颗粒循环率随着中心导流管内风速的增加而增加，并随着环形鼓泡床内的风速逐渐增加。内部颗粒循环速率随着环形鼓泡床初始静床高度的增加而增加，随着颗粒尺寸的增加而减小。通过对实验数据的回归得到相关公式。此外，