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›› 2014, Vol. 14 ›› Issue (1): 42-46.

• 流动与传递 • 上一篇    下一篇

内循环三相生物流化床反应器中流体的循环速度

牛凯远 胡堃 余孟栗 黄卫星   

  1. 四川大学化学工程学院 四川大学化学工程学院 四川大学化工学院
  • 收稿日期:2013-09-27 修回日期:2013-12-04 出版日期:2014-02-20 发布日期:2014-02-20

Circulation Velocity of Fluid in Three-phase Biological Fluidized Bed Reactor with Internal Circulation

NIU Kai-yuan HU Kun YU Meng-li HUANG Wei-xing   

  1. School of chemical engineering, Sichuan University School of chemical engineering, Sichuan University School of Chem. Eng., Sichuan Univ.
  • Received:2013-09-27 Revised:2013-12-04 Online:2014-02-20 Published:2014-02-20

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被引次数

5

摘要： 通过实验和CFD模拟研究了反应器内气含率和局部阻力系数与操作参数和结构参数的关系. 结果表明，气含率随进气速率Ugr增大而增大，局部阻力系数随反应器升、降流区截面积比Ar/Ad增大而减小，随导流筒直径与导流筒距反应器底高度之比d/h增大而增大，由此建立了升、降流区气含率和导流筒底端局部阻力系数关联式. 在此基础上，采用降流区流体速度模型，研究了局部阻力与沿程阻力对降流区速度的影响，并实验测试不同操作和结构条件下降流区的流体速度. 模型计算与实测速度对比分析表明，根据所建局部阻力系数关联式并考虑沿程阻力影响，可获得与实测结果吻合较好的降流区速度. Ugr取最大值2.29 m/s时，降流区流体速度最大可达0.32 m/s，且Ar/Ad取最大值1.61、d/h取最小值1.75时反应器中流体循环更好.

关键词: 流化床反应器, 流体速度, 气含率, 阻力系数

Abstract: The gas hold-up in the reactor and local flow resistance at the bottom of downcomer under different operating and structural conditions were studied by experiments and CFD simulation. The results show that the gas hold-up increases with increasing of gas input velocity Ugr, while the local resistance factor increases with decreasing of Ar/Ad and increasing of d/h. Based on these results, new correlations for the gas hold-up and local flow resistance factor were developed. Then, the downcomer fluid velocity under different operating and structural conditions were measured, and the effects of local flow resistance and friction resistance analyzed with the established fluid velocity model. It is found that both the local flow resistance and friction resistance affect the downcomer fluid velocity significantly, and by using the new correlations in the fluid velocity model, the downcomer velocities predicted by the model are in good agreement with experimental measurements. The downcomer velocity reaches the largest value 0.32 m/s when Ugr is 2.29 m/s. However, the fluid velocity gets the largest value when Ar/Ad is taken as the maximum value 1.61 and d/h as the minimum value 1.75.

Key words: fluidized bed reactor, fluid velocity, gas hold-up, frictional loss coefficient

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