A CFD study of biomass pyrolysis in a downer reactor equipped with a novel gas–solid separator-II thermochemical performance and products

Yu, Xi; Hassan, Mohamed I.; Ocone, Raffaella; Makkawi, Yassir

doi:10.1016/j.fuproc.2015.01.002

Cited by 40 publications

(37 citation statements)

References 47 publications

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“…where is specified by the CFL condition to fall within the range of ~ 1 -5 [32,33]. In this study, a time step of 0.001 seconds was found to satisfy this condition.…”

Section: Computation Simulation Procedures and Boundary Conditionsmentioning

confidence: 76%

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Effect of Oscillatory Flow on Nucleation Kinetics of Butyl Paraben

Yang

Raval

et al. 2016

Crystal Growth & Design

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More than 165 induction times of butyl paraben-ethanol solution in batch moving fluid oscillation baffled crystallizer with various amplitudes (1-9 mm) and frequencies (1.0-9.0 Hz) have been determined to study the effect of COBR operating conditions on nucleation. The induction time decreases with increasing amplitude and frequency at power density below about 500 W/m 3 , however, a further increase of the frequency and amplitude leads to an increase of the induction time. The interfacial energies and pre-exponential factors in both homogeneous and heterogeneous nucleation are determined by Classical Nucleation Theory at oscillatory frequency 2.0 Hz and amplitudes of 3 mm or 5 mm both with and without net flow. To capture the shear rate conditions in oscillatory flow crystallisers, a Large Eddy Simulation approach in Computational Fluid Dynamics framework is applied. Under ideal conditions the shear rate distribution shows spatial and temporal periodicity and radially symmetry. The spatial distributions of the shear rate indicate an increase of average and maximum values of the shear rate with increasing amplitude and frequency. In

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“…where is specified by the CFL condition to fall within the range of ~ 1 -5 [32,33]. In this study, a time step of 0.001 seconds was found to satisfy this condition.…”

Section: Computation Simulation Procedures and Boundary Conditionsmentioning

confidence: 76%

“…velocity and shear rate) of the liquid phase within both reactors. The model was solved using the computational fluid dynamic (CFD) software ANSYS FLUENT Version 14 [32] .…”

Section: Cfd Model (Subgrid-scale Model)mentioning

confidence: 99%

Effect of Oscillatory Flow on Nucleation Kinetics of Butyl Paraben

Yang

Raval

et al. 2016

Crystal Growth & Design

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“…The linearized equations for governing equations were solved using a block algebraic multigrid method. In order to ensure easy convergence of the various partial differential equations (PDE) in the model, the Courant–Friedrichs–Lewy (CFL) condition for three‐dimensional PDE is followed:

C = \frac{u_{x} Δ t}{Δ x} + \frac{u_{y} Δ t}{Δ y} + \frac{u_{z} Δ t}{Δ z} \leq C_{max}

where C max is specified by the CFL condition to fall within the range of ∼1−5, In this study, a time step of 0.0007 seconds was found to satisfy this condition. The time step 0.0007 is corresponding to a

2.52 °

impeller rotation in the TFM simulation of case II.…”

Section: Introductionmentioning

confidence: 99%

A compartmental CFD‐PBM model of high shear wet granulation

Hounslow

Reynolds

et al. 2016

AIChE Journal

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The conventional, geometrically lumped description of the physical processes inside a high shear granulator is not reliable for process design and scale-up. In this study, a compartmental Population Balance Model (PBM) with spatial dependence is developed and validated in two lab-scale high shear granulation processes using a 1.9L MiPro granulator and 4L DIOSNA granulator. The compartmental structure is built using a heuristic approach based on computational fluid dynamics (CFD) analysis, which includes the overall flow pattern, velocity and solids concentration. The constant volume Monte Carlo approach is implemented to solve the multi-compartment population balance equations. Different spatial dependent mechanisms are included in the compartmental PBM to describe granule growth.It is concluded that for both cases (low and high liquid content), the adjustment of parameters (e.g. layering, coalescence and breakage rate) can provide a quantitative prediction of the granulation process.

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“…The method is started by solving the transient momentum equation for each particle. In order to calculate the trajectory of a particle, Newton's second law is used and written in a Lagrangian reference frame [41][42][43][44]. Momentum balance for particles is described in Equation (6),…”

Section: Eulerian-lagrangian Methodsmentioning

confidence: 99%

Numerical and Experimental Investigation of Equivalence Ratio (ER) and Feedstock Particle Size on Birchwood Gasification

Jayathilake

Rudra

2017

Energies

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This paper discusses the characteristics of Birchwood gasification using the simulated results of a Computational Fluid Dynamics (CFD) model. The CFD model is developed and validated with the experimental results obtained with the fixed bed downdraft gasifier available at the University of Agder (UIA), Norway. In this work, several parameters are examined and given importance, such as producer gas yield, syngas composition, lower heating value (LHV), and cold gas efficiency (CGE) of the syngas. The behavior of the parameters mentioned above is examined by varying the biomass particle size. The diameters of the two biomass particles are 11.5 mm and 9.18 mm. All the parameters investigate within the Equivalences Ratio (ER) range from 0.2 to 0.5. In the simulations, a variable air inflow rate is used to achieve different ER values. For the different biomass particle sizes, CO, CO 2 , CH 4 , and H 2 mass fractions of the syngas are analyzed along with syngas yield, LHV, and CGE. At an ER value of 0.35, 9.18 mm diameter particle shows average maximum values of 60% of CGE and 2.79 Nm 3 /h of syngas yield, in turn showing 3.4% and 0.09 Nm 3 /h improvement in the respective parameters over the 11.5 mm diameter biomass particle.

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A CFD study of biomass pyrolysis in a downer reactor equipped with a novel gas–solid separator-II thermochemical performance and products

Cited by 40 publications

References 47 publications

Effect of Oscillatory Flow on Nucleation Kinetics of Butyl Paraben

Effect of Oscillatory Flow on Nucleation Kinetics of Butyl Paraben

A compartmental CFD‐PBM model of high shear wet granulation

Numerical and Experimental Investigation of Equivalence Ratio (ER) and Feedstock Particle Size on Birchwood Gasification

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