Abstract

A comprehensive experimental study of the hydrodynamic behaviors for the specific system of air/paraffin oil/silica particles in a slurry bubble column of 0.15 m diameter and 2.9 m length has been carried out. The effect of regime transition, solid concentrations, static liquid height, sparger type and related bubble size on gas holdup over a range of superficial gas velocities has been investigated. From the experimental work, it is revealed that the gas holdup increases by increasing the superficial gas velocity and transition regime occurred at 0.043 to 0.08 m/s. The slope of this curve is steeper for homogeneous regime and less for heterogeneous regime. In addition, the presence of silica particle (0–40 vol %) inhibits bubble breakage, increases rise velocity and consequently decreases residence time and gas holdup. Approximately a 40% decrease in the overall gas holdup was observed by adding 40% solid particles to the air/paraffin oil system. Moreover, increasing static liquid height from 6 to 12 leads to about a 61% decrease in gas holdup in the absence of solid particles. Also, the use of a perforated plate instead of a porous one causes a 9% increase and a 21% decrease in bubble size and gas holdup, respectively. Finally, it is found that the Krishna and Sie correlation can predict gas holdup in the air/paraffin oil/silica particles system with an acceptable minimum relative error of about 8%.

中文翻译：

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三相鼓泡塔内在水动力研究：持气量对比实验研究

摘要

对直径为0.15 m，长度为2.9 m的浆料鼓泡塔中特定的空气/石蜡油/二氧化硅颗粒系统的水动力行为进行了综合实验研究。研究了在一定的表观气体速度范围内，制度转变，固体浓度，静态液体高度，喷射器类型和相关的气泡大小对气体滞留率的影响。从实验工作中发现，通过增加表观气体速度，气体滞留量增加，过渡态发生在0.043至0.08 m / s。对于均质状态，该曲线的斜率较大，而对于异质状态，该曲线的斜率较小。此外，二氧化硅颗粒（0–40体积％）的存在会抑制气泡破裂，提高上升速度，从而减少停留时间和气体滞留率。通过向空气/石蜡油系统中添加40％的固体颗粒，可以观察到总体气体滞留量降低约40％。而且，在没有固体颗粒的情况下，将静态液体高度从6增加到12会导致气体滞留量降低约61％。同样，使用多孔板代替多孔板分别会使气泡尺寸和气体滞留量分别增加9％和21％。最终，发现克里希纳和西耶的相关性可以预测空气/石蜡油/二氧化硅颗粒系统中的气体滞留率，可接受的最小相对误差约为8％。使用多孔板而不是多孔板会使气泡尺寸和气体滞留率分别增加9％和21％。最终，发现克里希纳和西耶的相关性可以预测空气/石蜡油/二氧化硅颗粒系统中的气体滞留率，可接受的最小相对误差约为8％。使用多孔板而不是多孔板分别会使气泡尺寸和气体滞留量分别增加9％和21％。最终，发现克里希纳（Krishna）和西（Sie）相关性可以预测空气/石蜡油/二氧化硅颗粒系统中的气体滞留率，可接受的最小相对误差约为8％。