CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures
Abstract
:1. Introduction
2. Fundamentals of Gas–Solid Cyclone Separators
2.1. Performance Parameters of Cyclones
2.1.1. Separation Efficiency
2.1.2. Pressure Loss
- Pressure loss at the inlet;
- Pressure loss in the separation zone;
- Pressure loss associated with the vortex finder.
2.2. Effect of Solids Loading on Cyclone Performance
2.3. Effect of Operating Temperature on Cyclone Performance
3. Approaches for the Numerical Modeling of Gas–Solid Systems
4. CFD Simulation Studies of Gas–Solid Cyclones at Ambient Temperature
4.1. Group I: Single-Phase Flow CFD Simulations
4.2. Group II: One-Way Coupled Gas–Solid Flow Simulations
4.3. Group III: Two- and Four-Way Coupled Gas–Solid Flow Simulations
4.3.1. E–L and Hybrid Model Simulations
Effect of Solids Loading
Agglomeration of Particles
4.3.2. E–E Simulations
4.4. Summary
5. CFD Simulation Studies of Gas–Solid Cyclones at Elevated Temperatures
5.1. Group I: Single-Phase Flow CFD Simulations
5.2. Group II: One-Way Coupled Gas–Solid Flow Simulations
5.3. Group III: Two- and Four-Way Coupled Gas–Solid Flow Simulations
5.3.1. Cyclone Heat Exchangers
5.3.2. CFD Simulation of Cyclones as a Part of a Bigger System
5.4. Summary
6. Outlook
Author Contributions
Funding
Conflicts of Interest
Abbreviations
CFB | Circulating fluidized bed |
CFD | Computational fluid dynamics |
DDPM | Dense discrete phase model |
DEM | Discrete element method |
DRW | Discrete random walk |
E–E | Eulerian–Eulerian |
E–L | Eulerian–Lagrangian |
LES | Large eddy simulation |
LRR | Launder, Reece, and Rodi model [73] (variation of the RSTM) |
KTGF | Kinetic theory of granular flows |
PBM | Population balance model |
PVC | Precessing vortex core |
RSTM | Reynolds stress transport model |
SGS | Subgrid-scale |
SSG | Speziale, Sarkar, and Gatski model [74] (variation of the RSTM) |
UDF | User-defined function |
URANS | Unsteady Reynolds-averaged Navier–Stokes |
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Author(s) | Cyclone Dimensions, D × H (m ) | Cyclone Re Number | Particle Diameter ( m) | Inlet Mass Loading (kg /kg ) | CFD Solver | Turbulence Model/Turbulent Dispersion | Drag Model | Validation/Comments |
---|---|---|---|---|---|---|---|---|
Chu et al. [109] | 0.2×0.8 | 272,000 | 2000 (mono-sized) | up to 2.5 | ANSYS FLUENT (computational fluid dynamics–discrete element model, CFD–DEM, + user–defined functions, UDF) | Reynolds stress turbulent model, RSTM/not mentioned | friction and pressure gradient drags + particle rotation | Pressure drop is compared with the experiments for particle-free and particle-laden flows with solids loadings in the range of 0–2.5 kg/kg |
Schneiderbauer et al. [110] | 2.5×6.0 | 817,000 | 0.6–400 (size range) | 0.22 | ANSYS FLUENT 16 (hybrid Eulerian–Eulerian, E–E, and Eulerian–Lagrangian, E–L) | RSTM/not mentioned | heterogeneous model of [111] | Predicted grade and overall efficiencies are compared with the measurements. The implemented agglomeration model is reported to be crucial for proper prediction of grade efficiency, while the predicted overall efficiency is not influenced by presence of the agglomeration model. |
Wei et al. [112] | 0.3×1.1 | 113,000–263,000 | 2000 (mono-sized) | 0.72–8.64 | ANSYS FLUENT 15.0 coupled with EDEM 2.7 (CFD–DEM) | RSTM/not mentioned | Gidaspow [50] | Predicted pressure drops are compared with the experimental data for solids loadings of 0.72–8.64 kg/kg. Presence of solid strands and an ash top ring are reported. |
Kozolub et al. [106] | 0.2×0.78 | 75,300–130,000 | 2000 (size range) | 0.61–2.9 | ANSYS FLUENT 13.0 (dense discrete phase model, DDPM, based on kinetic theory of granular flow, KTGF) | RSTM/not mentioned | Wen–Yu [113] | Pressure drop is compared with the experimental data for particle-free and particle-laden flows with solids loadings in the range of 0–2.9 kg/kg. For the particle-laden flow, the trend of pressure drop change is well predicted while the values are somewhat overpredicted. |
Sgrott and Sommerfeld [108] | 0.29×1.16 | 280,000 | 0.5–60 (size range) | 0.1 | [C3.0cm]OpenFOAM 2.3.1 (CFD–DEM + agglomeration) | [C2.0cm]Large eddy simulation, LES/isotropic Langevin model | not mentioned particle rotation | For a particle-free flow, the predicted velocity profiles are compared with the experimental data of [114]. No validation is given for the particle-laden simulation case. |
Zhou et al. [107] | 0.29×1.16 | 30,000–188,000 | 2000–2800 (size range) | 0.07–0.46 | ANSYS FLUENT 6.3 (CFD–DEM) | RSTM/not mentioned | Gidaspow [50] particle rotation lift force | The predicted velocity profiles of a particle-free flow are compared with the experimental data of [114]. The pressure drop of the particle-free and particle-laden cases is compared with the measurements, while the difference between the particle-free and particle-laden pressure drops is not significant. |
Hwang et al. [35] | 0.2×0.8 | 272,000 | 2000 (mono-sized) | up to 20 | ANSYS FLUENT 16.2 (DDPM–KTGF) | RSTM/discrete random walk, DRW | Wen–Yu [113] | The predicted pressure loss is compared with the experimental and numerical data of [109] for solid mass loadings up to 2.5. |
Author(s) | Scale of Simulation | CFD Solver | Gas–Solid Model | Turbulence/Drag Models |
---|---|---|---|---|
Cristea and Conti [143] | Preheater system (≈ 58 m height) | ANSYS FLUENT 18.1 | hybrid (DDPM–KTGF) | RSTM/Schiller and Naumann [146] |
Mikulčić et al. [144] | Industrial cyclone (≈ 13 m height and 6 m diameter) | FIRE commercial solver | E–L (two–way coupled) | LES/not mentioned |
Wasilewski [145] | Industrial cyclone (≈ 9 m height and 3.5 m diameter) | ANSYS FLUENT 14 | E–L (two–way coupled) | RSTM/Schiller and Naumann [146] |
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Nakhaei, M.; Lu, B.; Tian, Y.; Wang, W.; Dam-Johansen, K.; Wu, H. CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures. Processes 2020, 8, 228. https://doi.org/10.3390/pr8020228
Nakhaei M, Lu B, Tian Y, Wang W, Dam-Johansen K, Wu H. CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures. Processes. 2020; 8(2):228. https://doi.org/10.3390/pr8020228
Chicago/Turabian StyleNakhaei, Mohammadhadi, Bona Lu, Yujie Tian, Wei Wang, Kim Dam-Johansen, and Hao Wu. 2020. "CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures" Processes 8, no. 2: 228. https://doi.org/10.3390/pr8020228
APA StyleNakhaei, M., Lu, B., Tian, Y., Wang, W., Dam-Johansen, K., & Wu, H. (2020). CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures. Processes, 8(2), 228. https://doi.org/10.3390/pr8020228