Heterogeneous gas chemistry in the CPFD Eulerian–Lagrangian numerical scheme (ozone decomposition)

Snider, Dale M.; Banerjee, Sibashis S.

doi:10.1016/j.powtec.2009.04.023

Cited by 91 publications

(56 citation statements)

References 8 publications

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“…The fluid volume fraction multiplier is set as a À2:65 g . As indicated by Snider and Banerjee [38], the Wen-Yu model in the MP-PIC method is capable of providing the accurate predictions for dense gas-sold flows. Additionally, the Wen-Yu model has also been used by other researchers for the simulation of the gasparticle systems [20,29,39].…”

Section: Governing Equations For the Gas Phasementioning

confidence: 98%

“…In the current work the Wen-Yu drag model was chosen for the base case. The reason is that the Wen-Yu model in the MP-PIC method, as mentioned previously, is not the same as that used in the EE approach and can also be used for dense gas-solid flows [20,29,38,39]. However, to further examine the impact of different drag models in the MP-PIC method, the flow patterns from three cases using the different drag models such as the Wen-Yu, WenYu-Ergun, and Turton-Levenspiel models are compared in this section.…”

Section: Study Of Drag Modelmentioning

confidence: 99%

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Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

et al. 2015

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h i g h l i g h t sCFD simulation of biomass gasification in a dual fluidized-bed. The CFD model predicts the gas composition and the reactor temperature distribution. The CFD model has been validated by experimental data. The effects of the particle size distribution and drag models have been investigated. a r t i c l e i n f o t r a c tA three-dimensional CFD model was developed to simulate the full-loop of a dual fluidized-bed biomass gasification system consisting of a gasifier, a combustor, a cyclone separator, and a loop-seal. This fullloop simulation includes the chemical kinetic modeling of biomass drying and pyrolysis, heterogeneous char reactions, and homogeneous gas-phase reactions. In the model, the gas phase is described using Large Eddy Simulation (LES) and the particle phase is described with the Multiphase Particle-In-Cell (MP-PIC) method. The simulation was performed using the GPU-accelerated computing and the simulation results were compared with the gas composition and temperature measurements from a pilot-scale biomass gasification power plant (1 MW th , 6 tons biomass/day). The independence of the accuracy of the model on mesh resolution and computational particle number was determined. The impacts of the particle size distributions (PSD) and drag models on the reactive flows were also investigated.

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Section: Governing Equations For the Gas Phasementioning

confidence: 98%

Section: Study Of Drag Modelmentioning

confidence: 99%

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

et al. 2015

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“…The fluid is described by the Navier-Stokes equation with strong coupling to the discrete particles. The particle momentum follows the MP-PIC description which is a Lagrangian description of particle motions described by ordinary differential equations coupling with the fluid [13]. In the CPFD numerical method, actual particles are grouped into computational particles, each containing a number of particles with identical densities, volume and velocities located at a specific position.…”

Section: Reactions Reaction Ratesmentioning

confidence: 99%

“…More details about the questions, their parameters and numerical procedures for solving the equations can be found in [13,15]. CPFD method solves gasification reactions giving a reasonable prediction.…”

Section: Reactions Reaction Ratesmentioning

confidence: 99%

Stepwise analysis of gasification reactions with aspen plus and CPFD

Eikeland¹,

Thapa²

2017

Int. J. EQ

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The energy from biomass can be utilized through the thermochemical conversion processes of pyrolysis and gasification. Biomass such as wood chips is heated in a gasification reactor to produce a synthesis gas containing CO, H 2 and CH 4 . The gas can be further processed to bioproducts or fuels. The thermochemical process involves devolatilization of wood followed by steam gasification, CO 2 gasification, methanation, water gas shift reactions and methane reforming. To optimize the performance of the reactor, it is important to study each of the reactions separately.The reactions are simulated individually using the chemical process optimization software Aspen Plus. The results are compared with simulations performed with the Computational Particle Fluid Dynamic (CPFD) software Barracuda VR 15. The CPFD methodology solves the fluid and particle equations in three dimensions with the transient flow and is time-consuming. Aspen Plus is one dimensional and solves the included reactions fast.The results of the Aspen Plus and CPFD simulations, given as product gas compositions (CO, CO 2 , CH 4 and H 2 ), show that each reaction contributes to the product gas composition differently. Comparison between Aspen Plus and CPFD simulations of individual gasification reactions show good agreement. However, when all reactions are included in the simulations, there is a deviation in the volume fraction of product gas composition.

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“…This term is in addition to the typical "gas-solid" drag and the granular pressure terms. The form of the mass, species mass, momentum, and energy equations for the fluid-phase has been given by Snider et al [39] and Snider and Banerjee [40]. These equations were derived from Anderson and Jackson [41] and Jackson [42] and are discussed below.…”

Section: Numerical Modelmentioning

confidence: 99%

CO₂ Adsorption: Experimental Investigation and CFD Reactor Model Validation

Breault

Spenik²,

Huckaby

2014

Journal of Computational Environmental Sciences

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The National Energy Technology Laboratory is investigating a new process for CO 2 capture from large sources such as utility power generation facilities as an alternative to liquid amine based adsorption processes. Many of these advanced dry processes are based upon sorbents composed of supported polyamines. In this analysis, experiments have been conducted in a laboratory-scale fluidized bed reactor and compared to CFD reactor predictions using kinetics obtained from TGA tests. Batch experiments were conducted by flowing a mixture of CO 2 , H 2 O, and N 2 (simulated flue gas) through a fluidized bed of sorbent material. The exit gas composition time series data is compared to CFD simulations using a 3-dimensional nonisothermal reacting multiphase flow model. The effects of the gas flow rate, distributor design, and particle size are explored through the CFD simulations. It is shown that the time duration for CO 2 adsorption decreased for an increase in the gas flow. Fluid bed hydrodynamics indicated that there were regions in the reactor where the inert FCC particles segregated and defluidized; without adversely affecting the capacity of the sorbent to adsorb CO 2 . The details of the experimental facility and the model as well as the comparative analysis between the data and the simulation results are discussed.

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Heterogeneous gas chemistry in the CPFD Eulerian–Lagrangian numerical scheme (ozone decomposition)

Cited by 91 publications

References 8 publications

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

Stepwise analysis of gasification reactions with aspen plus and CPFD

CO₂ Adsorption: Experimental Investigation and CFD Reactor Model Validation

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Heterogeneous gas chemistry in the CPFD Eulerian–Lagrangian numerical scheme (ozone decomposition)

Cited by 91 publications

References 8 publications

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

Three-dimensional full-loop simulation of a dual fluidized-bed biomass gasifier

Stepwise analysis of gasification reactions with aspen plus and CPFD

CO2 Adsorption: Experimental Investigation and CFD Reactor Model Validation

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CO₂ Adsorption: Experimental Investigation and CFD Reactor Model Validation