scholarly journals Liquid mixing dynamics in slurry stirred tanks based on electrical resistance tomography

2016 ◽  
Vol 152 ◽  
pp. 478-487 ◽  
Author(s):  
Claudio Carletti ◽  
Giuseppina Montante ◽  
Cataldo De Blasio ◽  
Alessandro Paglianti
Keyword(s):  
Electrical Resistance ◽  
Stirred Tanks ◽  
Electrical Resistance Tomography ◽  
Liquid Mixing ◽  
Mixing Dynamics

Particles dissolution and liquid mixing dynamics by Electrical Resistance Tomography

2019 ◽  
Vol 42 (4) ◽  
pp. 647-654
Author(s):  
Alessandro Paglianti ◽  
Francesco Maluta ◽  
Giuseppina Montante
Keyword(s):  
Particle Size ◽  
Electrical Resistance ◽  
Stirred Tanks ◽  
Electrical Resistance Tomography ◽  
Novel Approach ◽  
Mixing Dynamics ◽  
Speed Up ◽  
Time Required ◽  
Simultaneous Identification ◽  
The Impact

Salt particles dissolution in slurry stirred tanks provides an ambitious challenge for the application of Electrical Resistance Tomography in the process industry, because the presence of high loadings of inert particles requires a purposely developed post-processing method of the experimental data. For the optimization of the working conditions of the dissolution process, two characteristic times are required: the time for the liquid homogenization in the tank and the time required for the complete dissolution of the salt particles. The former time has been experimentally determined in previous investigations both in stirred tanks working with single-phase and with multiphase mixtures. The latter characteristic time has not been analyzed so far, due to the lack of experimental procedures for distinguishing it from the former. In this work, a novel approach for the simultaneous identification of the two characteristic times is presented. The impact of the new procedure is significant for the production processes, since it offers a tool for identifying when the soluble particle size has an impact on the dissolution dynamics, and when the stirred tank dynamics is influenced by the liquid homogenization only, and therefore a reduction of the particle size does not speed up the process accomplishment.

GAS-LIQUID AND MISCIBLE LIQUID MIXING IN A PLANT-SCALE VESSEL MONITORED USING ELECTRICAL RESISTANCE TOMOGRAPHY

1999 ◽  
Vol 175 (1) ◽  
pp. 39-48 ◽  
Author(s):  
R. MANN ◽  
M. WANG ◽  
A. E. FORREST ◽  
P. J. HOLDEN ◽  
T. DYAKOWSKI ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electrical Resistance Tomography ◽  
Liquid Mixing

scholarly journals Using electrical resistance tomography to characterize and optimize the mixing of micron sized polymeric particles in a slurry reactor

2021 ◽  
Author(s):  
Parisa Tahvildarian
Keyword(s):  
Electrical Resistance ◽  
Tap Water ◽  
Slurry Reactor ◽  
Operating Conditions ◽  
Impeller Speed ◽  
Design Parameters ◽  
Electrical Resistance Tomography ◽  
Latex Particles ◽  
Liquid Mixing ◽  
Solid Liquid

A solid-liquid mixing system has a significant role in the suspension polymerization, crystallization, adsorption, and solid-catalyzed reactions. In this study, Electrical Resistance Tomography (ERT) was employed to investigate the effect of the particle size, the design parameters such as impeller type, impeller clearance and impeller diameter as well as operating conditions such as impeller speed, impeller pumping mode, and solids concentration on the mixing of micron sized latex particles in a slurry reactor. The ERT data were used to calculate the concentration profile and the degree of homogeneity in three dimensions, as a function of design parameters and operating within the reactor. In this work, tap water and latex particles (5.2 µm, 8.5 µm, 9.1 µm) were used as liquid and solid phase, respectively. Six axial impellers were utilized (A310, A100, A200, A320, A315, 3AM) with impeller speed (N) varying from 252 rpm to 400 rpm. Impeller diameter to tank diameter ratios (D/T) were in the range of 0.29 to 0.47 while, the impeller clearance (C/T) was changed in the range of T/3.8 to T/2.5. Impeller pumping was tested in both downward and upward directions. The concentration of latex particles was ranged between 15 wt% and 30 wt%. This study shows that the level of homogeneity in a solid-liquid mixing system improved with the increase in impeller speed. However, after achieving the maximum level of homogeneity, any further rise in the impeller speed had a detrimental effect on the level of homogeneity. A310 impeller, wtih D/T ratio of 0.31, demonstrated the highest level of homogeneity while the upward pumping direction was found to be more efficient than the downward one. In addition, a clearance of T/3 proved to create the highest level of homogeneity. Also, the results showed that a rise in the size and concentration of particles decreases the level of homogeneity. Thus, 5.2 µm latex particles with the concentration of 15 wt% demonstrated the highest level of homogeneity. Applying the findings of this study will lead to improved equipment design, chemical cost reduction, increased production rate, improved quality of products, and more efficient use of power in slurry reactors.

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