Powder Technology, Год журнала: 2023, Номер 426, С. 118625 - 118625
Опубликована: Май 10, 2023
Язык: Английский
Powder Technology, Год журнала: 2021, Номер 385, С. 557 - 571
Опубликована: Март 13, 2021
Язык: Английский
Процитировано
26
Biosystems Engineering, Год журнала: 2021, Номер 205, С. 187 - 211
Опубликована: Март 27, 2021
Язык: Английский
Процитировано
25
Powder Technology, Год журнала: 2023, Номер 427, С. 118707 - 118707
Опубликована: Июнь 8, 2023
Physical experiments and discrete element model (DEM) simulations are conducted to evaluate particle characteristics operation parameter effects on screw feeding performance for rotary shear-milled Douglas fir. Three metrics used: mass flow rate, shaft driving torque, specific energy consumption. The impact of size, size distribution (PSD), rotational speed (rpm), hopper dimensions the investigated. All employed reveal superior flowability 2-mm particles in contrast larger 6-mm counterpart. Remarkably, wider PSD results poorer than two mono-sized particles, proving enhancement achieved by narrower woody feedstock. More importantly, DEM unveil PSD-induced degradation is attributed mechanical interlocking segregation effects. Furthermore, higher rpm causes rate at cost consumption due viscous dissipation changes pattern.
Язык: Английский
Процитировано
11
Particuology, Год журнала: 2021, Номер 62, С. 14 - 24
Опубликована: Авг. 21, 2021
In this research, a Graphical Processing Unit (GPU) accelerated Discrete Element Method (DEM) code was developed and coupled with the Computational Fluid Dynamic (CFD) software MFiX to simulate granular multiphase flows heat transfers chemical reactions. The Fortran-based CFD solver CUDA/C++ based DEM through inter-process pipes. speedup CPU version of MFiX-DEM is about 130–243 folds in simulation particle packings. fluidized bed simulations, computation time reduced from 91% 17% 78 folds. Geldart A fluidization revealed similar level importance both fluid coarse-graining. filtered drag derived two-fluid model suitable for Euler-Lagrangian simulations It overcorrects influence sub-grid structures if used only
Язык: Английский
Процитировано
22
Frontiers in Energy Research, Год журнала: 2022, Номер 10
Опубликована: Май 5, 2022
Biomass has potential as a carbon-neutral alternative to petroleum for chemical and energy products. However, complete replacement of fossil fuel is contingent upon efficient processes eliminate undesirable characteristics biomass, e.g., low bulk density, variability, storage-induced quality problems. Mechanical size reduction via comminution processing operation engineer favorable biomass flowability in handling. Crumbler rotary shear mill been empirically demonstrated produce more uniformly shaped particles with higher than hammermilled biomass. This study combines modeling experimentation unveil fundamental understandings the relation between granular particle flow behavior, which elucidate underlying mechanisms guide selection critical parameters. For this purpose, impact material attributes, including (2–6 mm), shape (briquette, chip, clumped-sphere, cube, etc.), surface roughness, on angle repose (AOR) milled pine chips were investigated using discrete element method (DEM) simulations. Forest Concepts system used within same range considered DEM AOR different sets these measured experimentally benchmark results against experimental data. Specific consumption moisture content are technoeconomic analysis. Our show that smaller (2 mm) achieves better followability (i.e., AOR) while cost significantly density almost 6-mm particles. 2-mm size, Crumbles from veneer have properties chips. Contrarily, no significant difference was observed two materials size. Furthermore, simulations, mechanical interlocking found dominant factor determining complex-shaped such pine, cannot be accurately captured by simple shapes (e.g., mono-sphere) rolling resistance model. Conversely, clumped-sphere model alleviates limitation without increasing computational can accurate representation when simulating free-flow behavior.
Язык: Английский
Процитировано
16
ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 12(10), С. 4213 - 4223
Опубликована: Фев. 28, 2024
Numerical modeling of granular biomass material flow in handling operations is indispensable to decipher upsets, commonly manifested as clogging and jamming hoppers augers. With a computational tool developed based on smoothed particle hydrodynamics (SPH), we simulated the hopper auger feeding six materials. The good agreement between experimental numerical rates demonstrated capability SPH solver complicated impact physical parameters investigated, major results show that pattern controlled by shear band evolution; collectively influenced opening size, wall friction, packing, compressibility feed rate minimal. These parametric studies validate solver's robustness simulating equipment demonstrate can provide insights about mechanics facilitate design optimize operations.
Язык: Английский
Процитировано
3
Powder Technology, Год журнала: 2024, Номер 440, С. 119771 - 119771
Опубликована: Апрель 17, 2024
An experiment-informed discrete particle simulation study was performed to investigate the role of flexural particles in shear flow milled pine residues. Physical anatomical fraction samples were tested an FT4 powder rheometer. A chip model for bark/stem chips and a fiber needles proposed DEM. The simulations show mixed fibers/chips require higher force torque drive than pure or fibers. mass flexibility fibers reveal nonlinear inter-dependency on impacting fibers/chips. Polydisperse well match needle-rich attributes, while polydisperse agree reasonably with bark/stem-rich samples. DEM indicates that flowability residue biomass is determined collectively by various material attributes fractions, which must be considered when developing preprocessing methods conversion-ready adequate handling performance.
Язык: Английский
Процитировано
3
Powder Technology, Год журнала: 2024, Номер 442, С. 119834 - 119834
Опубликована: Май 9, 2024
Язык: Английский
Процитировано
3
Fuel, Год журнала: 2024, Номер 375, С. 132572 - 132572
Опубликована: Июль 31, 2024
This study investigates the intricate relationship between biomass preprocessing and pyrolysis product yields, employing air classification technique for treatment of loblolly pine residues with varying moisture content. A comprehensive exploration physicochemical properties air-classified informs a sophisticated simulation model. Given complex multifaceted nature pyrolysis, operating across diverse temporal spatial scales, kinetics-based CFD–DEM method is employed to predict yields. Results showed that elevated content amplifies particle adhesiveness, necessitating augmented velocities effective separation, thereby influencing efficiency separation process. While carbon hydrogen contents exhibit relative stability blower frequencies, oxygen undergoes noticeable changes. For example, were measured as 29.2 38.6 wt% in light fraction 30 % sample at frequencies 10 20 Hz, respectively. An intriguing finding emerges from simulation, indicating lower frequency moderately enhances bio-oil yield significantly improves its quality, particularly terms water instance, was about 1.5 heavy fractions, respectively under 15 Hz frequency. In summary, detailed understanding strategic manipulation critical material attributes through efficient fractionation techniques are imperative advancing fast sustainable avenue renewable energy chemical production.
Язык: Английский
Процитировано
3
ACS Sustainable Chemistry & Engineering, Год журнала: 2025, Номер 13(2), С. 731 - 736
Опубликована: Янв. 9, 2025
Magnesium stearate (MgSt), a common flow additive and anticaking agent, was applied to corn stover feedstocks with three particle sizes. The material handling properties of dry, 15%, 30% moisture content were measured Freeman FT-4 powder rheometer mass hopper calculations. While hydrated biomass typically exhibits poor flowability, introducing MgSt led significant increase in flowability for dry 15% feedstocks, less impact at content. Inverse gas chromatography showed decrease, up 40%, the surface energy MgSt-coated stover. may not be ideal biofuel or chemical production, this study highlights potential additives reduce adhesive cohesive forces, improving feedstock handling.
Язык: Английский
Процитировано
0