Design of impeller blades for efficient homogeneity of solid-liquid suspension in a stirred tank reactor

Gu, Deyin; Liu, Zuohua; Qiu, Facheng; Li, Jun; Tao, Changyuan; Wang, Yundong

doi:10.1016/j.apt.2017.06.027

Cited by 47 publications

(33 citation statements)

References 20 publications

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“… The length-to-diameter L/D ratio: varied over constant vessel volume to analyse different temperature distribution behaviours within the model, as illustrated in Table II. The ratio was varied according to experimental work on stirred tanks in literature [19][20][21].  Wall thickness t mm: taken as spacing between the reactor's wall and the jacket used.…”

Section: Materials and Methods A) Generalised Carbonation Reactormentioning

confidence: 99%

Optimisation of Carbonation Reactor Design Using Multiphysics Models for Precipitated Calcium Carbonate PCC Production

Elzaki¹

2020

IRJIET

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Temperature distributions in the carbonation reactor with an inner diameter of 4.23m and overall length of 7m is numerically modelled. This is motivated by the need to lower overall capital and operating costs, and to optimise the carbonation process performance, simultaneously. In this paper, computational simulations are used to design an industrial scale carbonation reactor 89.72m 3 consisting of an external cooling jacket. Several parameters are varied including reactor's geometry (6 shapes), wall thickness (100, 200, and 300mm), cooling jacket temperature (15, 25, and 35ºC), and material type. These parameters are varied interchangeably to compare temperature probe plots at a point probe (1.5,0) located closer to the cooling jacket region. Simulations in COMSOL ® Multiphysics 5.2a show that partial Carbon Steel AISI 4340 jackets with a 100mm distance, between vessel wall and outside wall of jacket, while operating at ambient temperature range of 20-25ºc, can achieve the required operating temperature i.e. 50±5ºC. Then, the precipitation process of the calcium carbonate (PCC) is maximised. This result in decreased bare materials' capital costs by 95.87% and 97.39% compared to Nickel and Titanium, respectively. The need for cooling the water for the jacket is eliminated, while operating costs are lowered by 25-50% per 10ºC. A simplified experimental setup is proposed to demonstrate the coupling of COMSOL ® simulations with experimental work can be a reliable and an effective method to evaluate the carbonation reactor model design.

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Section: Materials and Methods A) Generalised Carbonation Reactormentioning

confidence: 99%

Optimisation of Carbonation Reactor Design Using Multiphysics Models for Precipitated Calcium Carbonate PCC Production

Elzaki¹

2020

IRJIET

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“…Gu et al [37] even coupled the system with a so-called chaotic motor. Gu et al [36] used the same 6-PBflex impellers already discussed for the single-stage case by Qiu et al [14], which were normal 6-PBs with flexible tips made of silicone. The comparison was made for two-stage impeller combinations of two 6-PBs, two 6-PBflex and also of two 6-pitched blade impellers with flexible additions where the rigid parts of the blade were punctured (6-PBflexP).…”

Section: Flexible Single/multistage Hybrid-type Impellersmentioning

confidence: 99%

“…Liu and Gu et al investigated flexible impellers. While Gu et al investigated two separate impellers with flexible parts in one multistage combination, the same group and Liu et al connected the two stages with a flexible part turning the multistage combination rather into one large impeller. Gu et al even coupled the system with a so‐called chaotic motor.…”

Section: Impellers Used In Cultivation Systemsmentioning

confidence: 99%

“…Regarding the application in cultivation cases, the same statements made before for the study by Qiu et al of flexible impellers also hold here for all three mentioned studies as Liu et al worked in a liquid‐liquid and Gu et al. , worked in a liquid‐solid systems. Therefore, no aeration and no biological conditions were tested.…”

Section: Impellers Used In Cultivation Systemsmentioning

confidence: 99%

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Multiphase Stirred Tank Bioreactors – New Geometrical Concepts and Scale‐up Approaches

Böhm

Hohl

Bliatsiou

et al. 2019

Chemie Ingenieur Technik

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Mainly with respect to biotechnological cases, current developments in the field of impeller geometries and findings for multistage configurations with a specific view on aerated stirred tanks are reviewed. Although often the first choice, in the given case the 6‐straight blade disc turbine is usually not the best option. Furthermore, quantities usable for scale‐up, specifically applicable in this field are discussed. Only quantities taking local conditions into account appear to be able to actually compare different stirrer types and scales.

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“…Therefore, in order to further improve the suspension quality of solid particles, it is necessary to enhance the pumping capacity of the impeller, and intensify the local energy dissipation process of the flow field under the premise of ensuring sufficient main convection. Based on our previous studies (Gu et al 2017a(Gu et al , 2017b, a type of punched circle package impeller is proposed to improve the homogeneity of solid-liquid twophase system in this work.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics simulation of solid-liquid suspension characteristics in a stirred tank with punched circle package impellers

Liu

2020

International Journal of Chemical Reactor Engineering

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Solid-liquid suspension characteristics in a stirred tank with four pitched-blade impellers, circle package impellers, and punched circle package impellers were studied via computational fluid dynamics (CFD) simulation. A classical Eulerian-Eulerian approach coupled with the standard k-ε turbulence model was adopted to simulate the solid-liquid two-phase turbulent flow. The effects of impeller speed, power consumption, impeller type, aperture size/ratio, solid particle diameter and liquid viscosity on the solid particle suspension quality were investigated. Results showed that the solid particle suspension quality was improved with an increment in the impeller speed. Punched circle package impeller could reduce the just suspension speed and improve the level of homogeneity for solid-liquid mixing process on the basis of four pitched-blade impeller and circle package impeller. The optimum aperture ratio and aperture diameter were 11.8% and 8 mm, respectively, for solid particles suspension process in this work. Smaller particle diameter led to smaller settling velocity and higher solid particle suspension quality. More viscous liquid was easier for sustaining the solid particles in suspension state. Meanwhile, punched circle package impeller can reduce the power consumption compared with four pitched-blade impeller and circle package impeller at the same impeller speed, and enhance the solid integrated velocity, turbulent kinetic energy, and turbulent kinetic energy dissipation rate of solid-liquid mixing system at the same power consumption.

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Design of impeller blades for efficient homogeneity of solid-liquid suspension in a stirred tank reactor

Cited by 47 publications

References 20 publications

Optimisation of Carbonation Reactor Design Using Multiphysics Models for Precipitated Calcium Carbonate PCC Production

Optimisation of Carbonation Reactor Design Using Multiphysics Models for Precipitated Calcium Carbonate PCC Production

Multiphase Stirred Tank Bioreactors – New Geometrical Concepts and Scale‐up Approaches

Computational fluid dynamics simulation of solid-liquid suspension characteristics in a stirred tank with punched circle package impellers

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