Two-dimensional modeling of torrefaction of a large biomass particle

Kamila, Biswajit; Sadhukhan, Anup Kumar; Gupta, Parthapratim; Basu, Prabir; Regmi, Bharat; Dutta, Animesh; Acharya, Bishnu

doi:10.1080/15435075.2017.1359785

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…Although the biomass furnace bed is a solid–gas-phase reacting zone, the homogeneous bed model presumes the biomass packed bed to be a single phase, so that air and solid particles’ thermal properties are aggregated into one equation; in other words, the two phases are assumed to have equal temperatures. The chemical reaction mechanism dominates the conversion in this method, and the results of the single biomass particle model extend to the whole bed. ,,,,,− In the course of the bed modeling of the grate bed combustors, this method would not provide precise outcomes, as in reality the particles inside the bed have different boundary conditions, while this model can perform much better for fluidized bed modeling.…”

Section: Modeling and Cfd Simulationmentioning

confidence: 99%

A Review of Numerical Modeling and Experimental Analysis of Combustion in Moving Grate Biomass Combustors

2019

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This Review covers the current state-of-the-art literature dealing with numerical modeling and experimental analysis of moving grate biomass combustors. The greatest attention is paid to the modeling of the thermochemical conversion in the fuel bed. Changes in the fuel characteristics are also tracked during the combustion. Such a review can facilitate understanding a more robust model from viewpoints of thermal performance, chemical and physical properties, pollutant emissions, and combustion stability. Different modeling approaches for the moving grate biomass furnaces are introduced, with a focus on the independent fuel bed modeling. Stepwise biomass fuel degradation inside the bed and corresponding individual mathematical models are described, followed by overbed combustion modeling. Numerical methods for the conservation equations of the combustion model are classified, and a general iterative solution algorithm is delivered. Various NO x formation mechanisms from the fuel-bed efflux and the combustion of hot zone gases are detailed, followed by the particle matter originating from inorganic materials. Air-staging, the flue gas recirculation mechanism, and restriction of the maximum flame temperature can significantly reduce the NO x concentration in the flue gases. Industrial biomass combustion systems are addressed in terms of different grate technologies, and a general laboratory-scale biomass reactor is portrayed. For future work, according to the gaps found in the literature, it is recommended that, considering the intensive inhomogeneity of the biomass fuels, the effects of the fuel uncertainties should be considered in the bed modeling. Furthermore, deep investigation of the infrared images captured from biomass combustion can provide a comprehensive tool for the combustion system analysis. More recommendations are given in the conclusion of this Review.

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Section: Modeling and Cfd Simulationmentioning

confidence: 99%

A Review of Numerical Modeling and Experimental Analysis of Combustion in Moving Grate Biomass Combustors

2019

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“…Early studies on biomass pyrolysis focused on the reaction mechanism and often ignored the convective terms in the mass and energy balances. − More recent studies included the pressure build-up and the convective flow of gases out of the particle in order to obtain a more accurate description of the pyrolysis process. ,, However, the numerical challenges associated with solving balance equations in spherical coordinates that include convective terms are not insignificant. Formulating discretization schemes in spherical coordinates requires some additional considerations as direct discretization of radial derivatives, i.e., by replacing d r by Δ r , and so on, can result in a nonconservative scheme in which the total mass of all species is not conserved.…”

Section: Introductionmentioning

confidence: 99%

1D Finite Volume Scheme for Simulating Gas–Solid Reactions in Porous Spherical Particles with Application to Biomass Pyrolysis

Sadegh-Vaziri

Winberg-Wang

Bäbler

2021

Ind. Eng. Chem. Res.

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Models for gas−solid reactions in porous particles typically consist of a set of mass and energy balances in the form of conservation equations. For spherical or close to spherical particles, these equations are formulated in 1D spherical coordinates. In the case where accumulation of gas inside the particle is significant, the balance equations contain convective terms. The present work presents a simple numerical scheme based on flux limited finite volume methods for discretizing conservation equations for convective and diffusive transport of mass and energy in radial direction in a porous sphere. The velocity is governed by Darcy's law coupled to an equation of state. The proposed scheme is applied to a series of test problems that admit full or partial analytical solutions. For the cases where only partial analytical solutions are available, a Comsol model is adopted for comparison. It is found that the scheme is able to resolve step gradients without generating oscillations and that it properly handles changes in the sign of the convective velocity. Applying the scheme for solving a common model for biomass pyrolysis reveals the importance of convective gas transport in the pyrolysis of thermally thick biomass particles.

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Bioenergy Production Using Biomass Wastes: Challenges of Circular Economy

Ilango

2024

Valorization of Biomass Wastes for Environmental Sustainability

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Two-dimensional modeling of torrefaction of a large biomass particle

Cited by 7 publications

References 29 publications

A Review of Numerical Modeling and Experimental Analysis of Combustion in Moving Grate Biomass Combustors

A Review of Numerical Modeling and Experimental Analysis of Combustion in Moving Grate Biomass Combustors

1D Finite Volume Scheme for Simulating Gas–Solid Reactions in Porous Spherical Particles with Application to Biomass Pyrolysis

Bioenergy Production Using Biomass Wastes: Challenges of Circular Economy

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