A diffusion model for particle mixing in a packed bed of burning solids

Yang, Yao; Lim, Chae-Wook; Goodfellow, J.; Sharifi, Vida N.; Swithenbank, J.

doi:10.1016/j.fuel.2004.09.002

Cited by 78 publications

(46 citation statements)

References 13 publications

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“…This trend is in accord with Lee's experiment. 60 It can also be seen that the higher pressure favors the CaOcarbonation reaction and the mass fraction of CaCO 3 increases by increasing operating pressure.…”

Section: Prediction Of Entrained Flow Coal Gasifiermentioning

confidence: 92%

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Two fluid model using kinetic theory for modeling of one‐step hydrogen production gasifier

Lü

Zhang

et al. 2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).A Two Fluid Model (TFM) using kinetic theory of granular flow has been developed to describe an innovative process of hydrogen production in a single step. An extended Multi-species of Solid Phase (MSP) method is proposed to simulate the gas-solid heterogeneous reactions in an entrained flow gasifier, as opposed to Single-species of Solid Phase (SSP) in previous studies. The intrinsic equations of methane steam reforming and water-gas shift reactions are used for a good understanding of the reaction mechanism for high concentration of hydrogen production under higher pressure. On the basis of the results of computing, the main feature of core-annular reaction zone is predicted in the fully developed flow region. And the similar flame-like structure for velocity and temperature is observed to emerge from the feed injection zone at the bottom of gasifier. The model well illustrates the effects of CaO on enhancing the concentration of hydrogen and sequestering CO 2 in the process of coal gasification. The advantages of pressure gasification are also shown that coal conversion increases with increasing pressure while H 2 S concentration and tar content decreases. Moreover, there is a steep increase in H 2 S and tar species initiated from the entrance of gasifier and then a decrease at the next section. The model shows good agreement with the measurements of flow field and gas products concentration in laboratory-scale plants.

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Section: Prediction Of Entrained Flow Coal Gasifiermentioning

confidence: 92%

“…The value of D s,i is also in the range of Yang's data. 60 The energy transport equations are solved for the specific enthalpy of gas phase and solid phase, which take the form:…”

Section: Coal Gasification Reactionsmentioning

confidence: 99%

Two fluid model using kinetic theory for modeling of one‐step hydrogen production gasifier

Lü

Zhang

et al. 2008

AIChE Journal

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“…This process delays the oxidation of the log mass and therefore decreases the efficiency of heat production. It has been confirmed by a number of researchers [3], [4], [5], [6] and [7] that, in the residential stove, the combustion reaction can be regarded as approaching equilibrium. Furthermore, it is reasonable that, in the wood pyrolysis process, each substance to form a particle is uniformly released.…”

Section: Governing Equationsmentioning

confidence: 98%

CFD Approach for Modeling High and Low Combustion in a Natural Draft Residential Wood Log Stove

Kalla¹,

Marcoux²,

Champlain³

2015

IJHT

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In this work, a comprehensive CFD model was developed for pyrolysis to provide significant emission reductions. In wood stoves with natural draft, the airflow is driven by buoyancy to overcome the resistance to flow within the stove. This combustion model is tested to reproduce at best the physical and chemical phenomena taking place in a natural draft wood log stove for low power (18 kW) residential heating. The RANS approach was used to solve the aerothermodynami c equations. A body fitted hexahedron mesh was adopted and the k-ε turbulence model was used to ensure closure of the Navier-Stokes equations. The chemical reaction for combustion was modeled using species transport and rate of species production formulated as the EDDY DISSIPATION CONCEPT. The key parameters for validation are based on temperature inside the combustion chamber at the center plane and the [CO]/[CO2] ratio for emissions at the exit plane. Therefore, the developed modelling approach can be used for engineering analysis and optimization of existing stoves and for relatively-quick evaluations of new stove designs.

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“…To improve TIRIE's ability of obtaining kinetic parameters, the commonly used theoretical models, including Langmuir model [21], diffusion particle model [22] and pseudo-first-order interaction kinetics [23], are needed to fit the experimental data. As all the above models can only be applied after the experimental data being collected, the kinetic parameters obtained by the fittings are depended on the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Kinetic analysis of the weak affinity interaction between tris and lysozyme

Tai

Hao

Niu

et al. 2015

Biochemical and Biophysical Research Communications

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a b s t r a c tThe biosensor based on total internal reflection imaging ellipsometry (TIRIE), regarded as an automotive real-time research approach for biomolecular interaction, is introduced to analyze the kinetic process of the weak interaction between tris and lysozyme. The experiment is performed by delivering lysozyme solution diluted to different concentrations to the biosensor substrate interface immobilized with tris. By applying pseudo-first-order interaction kinetics model, we are able to obtain the kinetic parameters from fitting experimental data. The calculated association rate constant and dissociation rate constant of tris and lysozyme interaction are in 10 À2 mol À1 s À1 and 10 3 s À1 magnitude, respectively. To further improve TIRIE!s ability for kinetically characterizing biomolecular interaction, a theoretical method to deduce associate rate constant before experiment is proposed.

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A diffusion model for particle mixing in a packed bed of burning solids

Cited by 78 publications

References 13 publications

Two fluid model using kinetic theory for modeling of one‐step hydrogen production gasifier

Two fluid model using kinetic theory for modeling of one‐step hydrogen production gasifier

CFD Approach for Modeling High and Low Combustion in a Natural Draft Residential Wood Log Stove

Kinetic analysis of the weak affinity interaction between tris and lysozyme

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