Determination of the just-suspended speed, Njs, in stirred tanks using electrical resistance tomography (ERT),AIChE Journal

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Determination of the just-suspended speed, Njs, in stirred tanks using electrical resistance tomography (ERT)
AIChE Journal ( IF 3.5 ) Pub Date : 2021-06-16 , DOI: 10.1002/aic.17354
Baran Teoman _{1,

2} , Chadakarn Sirasitthichoke ₁ , Andrei Potanin ₂ , Piero M. Armenante ₁

Affiliation

N_js, the minimum agitation speed to just-suspend dispersed solids in liquids in stirred tanks, is a critical parameter to operate industrial processes. The focus of this work was to develop a novel observer-independent method to experimentally obtain N_js in tanks that cannot be visually inspected internally using electrical resistance tomography (ERT). The mean bulk resistivity was measured across electrodes mounted on an ERT linear sensing probe placed inside a stirred tank containing water and glass beads. As the agitation speed increased, more solids became suspended and the resistivity measured by the probe changed. Plots of resistivity variation vs. agitation speed resulted in an S-shaped curve that could be analyzed to determine N_js. The N_js values obtained with this novel approach compared very favorably with those obtained using other methods requiring transparent tanks. It is expected that the ERT method proposed here could find applications in many industrial solid–liquid mixing processes.

中文翻译：

使用电阻断层扫描 (ERT) 确定搅拌罐中刚暂停的速度 Njs

N _js是在搅拌罐中将分散的固体悬浮在液体中的最小搅拌速度，是操作工业过程的关键参数。这项工作的重点是开发一种新的独立于观察者的方法，以通过实验获得罐中的N _js，这些罐无法使用电阻断层扫描 (ERT) 进行内部目视检查。平均体电阻率是通过安装在 ERT 线性传感探头上的电极测量的，该探头放置在装有水和玻璃珠的搅拌罐内。随着搅拌速度的增加，更多的固体被悬浮，探头测量的电阻率发生变化。电阻率变化与搅拌速度的关系图产生了一条S形曲线，可以对其进行分析以确定N _js。用这种新方法获得的N _js值与使用其他需要透明罐的方法获得的值相比非常有利。预计这里提出的 ERT 方法可以在许多工业固液混合过程中找到应用。

更新日期：2021-06-16

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