Numerical study on key issues in the Eulerian-Eulerian simulation of fluidization with wide particle size distributions
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Yang Liu
Abstract
Gas-particle flows in circulating fluidized beds (CFB) with wide particle size distributions were simulated using the Eulerian-Eulerian approach to analyze the effects of the particle phase division and the applicability of the particle-particle drag model. The results indicate that the simulation is not accurate by just using a single average particle diameter when the particle size distribution includes a critical particle diameter. A binary particle phase division criterion was then developed to establish two particle phases representing two types of particles with different flow patterns. Coupling the Eulerian-Eulerian approach with the new criterion enabled accurate predictions of the pressures, particle volume fractions, and particle mass circulation rates that were in agreement with experimental data. The influences of different particle-particle drag models were also investigated to show that the simulation using the Syamlal model was not accurate due to the overestimated particle-particle drag, while the results without particle-particle drag and with the Manger model were similar and much more accurate. Moreover, the flow mechanism for the non-uniformity of particle circulation rates in the parallel circulating loops of the CFB boiler was revealed. This study improves the Eulerian-Eulerian simulations of fluidization with wide particle size distributions and further deepens the understanding of flow characteristics in CFB.
Funding source: Science and Technology Project of China Huaneng Group Co., Ltd.
Award Identifier / Grant number: HNKJ20-H50
Funding source: Tsinghua-Huaneng Basic Energy Joint Research Institute
Award Identifier / Grant number: U20YYJC07
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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: This study was supported by the Science and Technology Project of China Huaneng Group Co., Ltd. (Grant no. HNKJ20-H50) and the Tsinghua-Huaneng Basic Energy Joint Research Institute (Grant no. U20YYJC07).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
According to the gas-particle flow regime diagram developed by Rabinovich and Kalman (2011), the flow states in the two simulated CFB (Test rig in Figure 1 and riser in Figure 11) are both fast fluidization as shown in Figure A.1. Re* is the Reynolds number representing overall upward gas-particle slip velocity, and Ar is the Archimedes number that characterizes the type of the particles.
Details about mesh models and grid independence test results.
Flow regime diagram for the simulated CFB (Rabinovich and Kalman 2011).
Mesh models for various grid element numbers.
Axial pressure distributions in the riser for various grid element numbers (Case 1).
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Articles in the same Issue
- Frontmatter
- Articles
- Tribological characterization of graphene oxide by laser ablation as a grease additive
- Hydro-liquefaction of asphaltene catalyzed by molybdenum-nickel bimetallic catalysts in slurry bed
- Leaching kinetics of copper and valuable metal extraction from copper-cadmium residues of zinc hydrometallurgy by oxidation acid leaching
- Numerical investigation on optimization of wall jet to reduce high temperature corrosion in 660 MW opposed wall fired boiler
- Kinetics of catalytic treatment of coking wastewater (COD, phenol and cyanide) using wet air oxidation
- Controllable oxidation of cyclohexanone to produce sodium adipate in an electrochemical reactor with a Pt NPs/Ti membrane electrode
- Numerical study on key issues in the Eulerian-Eulerian simulation of fluidization with wide particle size distributions
- Dynamics investigation on methane hydrate formation process with combined promotion methods
