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Hydrodynamics of a gas‐driven gas‐liquid‐solid spouted bed with a draft tube
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2020-05-31 , DOI: 10.1002/cjce.23819 Jia Meng 1 , Dominic Pjontek 1 , Ziyue Hu 1 , Jesse Zhu 1
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2020-05-31 , DOI: 10.1002/cjce.23819 Jia Meng 1 , Dominic Pjontek 1 , Ziyue Hu 1 , Jesse Zhu 1
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A cylindrical gas‐liquid‐solid spouted bed, driven exclusively by gas flow, has been developed with a high potential for use in biochemical processes, such as a biological wastewater treatment. A plexiglass column with a 152 mm inner diameter was used in combination with a 53 mm inner diameter plexiglass draft tube. Three particle types were studied with densities ranging from 1044 kg/m3‐1485 kg/m3 and average particle sizes ranging from 0.7‐2.5 mm. Four flow regimes were observed when increasing the gas velocity, including fixed bed, semispouted bed, full spouted bed, and internal circulating fluidized bed. The transition gas velocities between those regimes were experimentally measured and termed as minimum spouting velocity, full spouting velocity, and minimum circulating velocity, respectively. A measurement of the downward particle flux in the annulus was used to identify the minimum spouting velocity, while the particle velocity and dense phase retraction in the annulus were monitored for the full spouting and minimum circulating velocities. All regime transition velocities increased with more dense particles and longer draft tubes. The minimum spouting velocity and full spouting velocity were not affected when varying the nozzle‐tube gap, while the minimum circulating velocity increased with longer nozzle‐tube gaps. Experiments without a draft tube were carried, though the spouting stability was significantly reduced without the draft tube.
中文翻译：
带有引流管的气驱动气液固喷射床的流体动力学
已开发出一种完全由气流驱动的圆柱形气液固喷射床，具有很高的潜力，可用于生物化学过程，例如生物废水处理。将内径为152 mm的有机玻璃柱与内径为53 mm的有机玻璃引流管结合使用。研究了三种颗粒类型，密度范围为1044 kg / m 3 -1485 kg / m 3平均粒径为0.7-2.5毫米。当增加气体流速时，观察到四种流动形式，包括固定床，半喷射床，全喷射床和内部循环流化床。通过实验测量了这些状态之间的过渡气体速度，并将其分别称为最小喷射速度，全喷射速度和最小循环速度。环空中向下的粒子通量的测量用于确定最小喷出速度，同时监测环空中的粒子速度和密相收缩，以获得全喷出和最小循环速度。所有态的转变速度随着密度更高的颗粒和更长的引流管而增加。当改变喷嘴-管间隙时，最小喷射速度和全喷射速度不受影响，而最小循环速度随着喷嘴-管间隙的增加而增加。进行了没有引流管的实验，尽管没有引流管的喷管稳定性大大降低了。
更新日期：2020-05-31
中文翻译：
带有引流管的气驱动气液固喷射床的流体动力学
已开发出一种完全由气流驱动的圆柱形气液固喷射床，具有很高的潜力，可用于生物化学过程，例如生物废水处理。将内径为152 mm的有机玻璃柱与内径为53 mm的有机玻璃引流管结合使用。研究了三种颗粒类型，密度范围为1044 kg / m 3 -1485 kg / m 3平均粒径为0.7-2.5毫米。当增加气体流速时，观察到四种流动形式，包括固定床，半喷射床，全喷射床和内部循环流化床。通过实验测量了这些状态之间的过渡气体速度，并将其分别称为最小喷射速度，全喷射速度和最小循环速度。环空中向下的粒子通量的测量用于确定最小喷出速度，同时监测环空中的粒子速度和密相收缩，以获得全喷出和最小循环速度。所有态的转变速度随着密度更高的颗粒和更长的引流管而增加。当改变喷嘴-管间隙时，最小喷射速度和全喷射速度不受影响，而最小循环速度随着喷嘴-管间隙的增加而增加。进行了没有引流管的实验，尽管没有引流管的喷管稳定性大大降低了。
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