Numerical and experimental investigations on enhancement mixing performance of multi-blade stirring system for fluids with different viscosities
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Qiyang Zhang
,
Hua Wang
Abstract
The poor mixing caused by zinc powder deposition in purification process is a serious problem which can’t be avoided in treatment of zinc-containing solid waste. Here, to enhance the purification efficiency of zinc-containing solid waste treatment reactor, two kinds of multi-blade combined stirring systems are compared with single layer four straight-blade and double-layer straight-blade (DFB) stirring systems which are traditionally chosen by industry. This study simulated and explored the flow field characteristics and purification effects of these four kinds of stirred-tank reactor, further proposes the unit ion purification energy (UIPE) as a criterion for purification energy consumption and effect evaluation. The results show that multi-blade combined (MBC) stirring system enhances axial flow by 12.56% in water. Meanwhile it effectively inhibits the growth of isolated mixing region which scope has decreased by 56.25%. In high viscosity Carboxymethylcellulose sodium solution, the fluid axial speed can be increased by up to 1407 times with MBC. MBC can increase the purification rate by 24.79% while the UIPE decreases by 29.45% compared with DFB which is used in industrial purification process. MBC paddle has exhibited a wide range of fluid viscosity applicability and axial velocity improvement effect. The improvement increases collisions between the impurity particles and the zinc powder particles, which increased rate of substitution reactions. The application of MBC solves the purification problem in the process of treating zinc-containing solid waste.
Funding source: Scientific Research Fund Project of Yunnan Education Department
Award Identifier / Grant number: 2021J0063
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 52166004
Funding source: Natural Science Foundation of Yunnan Province
Award Identifier / Grant number: 202101AU070031
Acknowledgments
The authors acknowledge the financial support from National Natural Science Foundation of China (NSFC) (Grant number 52166004), Natural Science Foundation of Yunnan Province, China (No. 202101AU070031) and Scientific Research Fund Project of Yunnan Education Department, China (No. 2021J0063). The authors wish to especially thank the referees for numerous detailed questions and comments that greatly improved the presentation.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Artikel in diesem Heft
- Frontmatter
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- DEM simulation of biomass pyrolysis in a novel interconnected screw reactor
- Numerical and experimental investigations on enhancement mixing performance of multi-blade stirring system for fluids with different viscosities
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- Optimization of hydrothermal liquefaction process for bio-oil products from kitchen residue under subcritical conditions
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Artikel in diesem Heft
- Frontmatter
- Articles
- Enhanced mechanical stirring by eccentric impeller stirring system in zinc hydrometallurgy process for cadmium removal
- DEM simulation of biomass pyrolysis in a novel interconnected screw reactor
- Numerical and experimental investigations on enhancement mixing performance of multi-blade stirring system for fluids with different viscosities
- The technical and economic analysis of processing and conversion of heavy oil cuts to valuable refinery products
- Effect of inlet gas velocity on gas-solid fluidization characteristics in fluidized bed
- Investigation into a multiple input/output bifurcated biochemical reaction with substrate inhibition in a real CSTR based on Cholette’s model
- Performance of photocatalytic oxidation surface with new geometry for indoor environment application: experimental and simulation
- Optimization of hydrothermal liquefaction process for bio-oil products from kitchen residue under subcritical conditions
- Value-added biochar production from microwave pyrolysis of peanut shell
- Short Communications
- Environmentally sustainable synthesis of cyclic carbonates from epoxides and CO2 promoted by MCM-41 supported dual imidazolium ionic liquids catalysts
