An Eulerian model for the simulation of the thermal conversion of a single large biomass particle

Gómez, Miguel Ángel; Porteiro, Jacobo; Chapela, Sergio; Mı́guez, J.L.

doi:10.1016/j.fuel.2018.02.063

Cited by 21 publications

(12 citation statements)

References 45 publications

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“…The model was able to capture uneven deformation of the particle during the conversion with qualitative agreement with the experimental observations. Goḿez et al 66 developed a model for conversion of a single particle based on the evolution of Eulerian variables, including enthalpy, local solid volume fraction, and biomass component densities, inside the particle. For shrinkage modeling, they divided the process into shrinkage of a single cell, which is calculated based on the true densities of biomass and char, and a global shrinkage that alters the overall size of the particle.…”

Section: ■ Recent Development In Numerical Modeling Of Biomass Conver...mentioning

confidence: 99%

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Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Fatehi

Weng

et al. 2021

Energy Fuels

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Biomass, as a renewable energy source, is available worldwide, is carbon neutral, and can be converted to various types of products depending on the market and on the specific applications. Among different technologies of biomass utilization, thermochemical conversion of biomass is the most efficient method with the shortest time scale of the process. Thermochemical conversion can be used to produce gas or liquid fuels, and it can be used for direct production of heat and electricity. Biomass thermochemical conversion is an active and fast growing field of research. New experimental methods with high spatial and temporal resolution such as laser diagnostics are being introduced, and numerical modeling of the physical and chemical details in biomass conversion is being conducted. In this review, we aim to provide an overview of the recent activities in the field of thermochemical conversion of biomass. Important parameters in the large scale conversion systems, such as temperature distribution, overall conversion rate of fuel, and distribution of different species, are strongly connected to the processes that occur on the scale of a single particle. Understanding the link between transport phenomena, chemical kinetics, and physical transformation on single particle scale can help to unravel issues such as emission and efficiency on the large scale. Hence, the focus of this review is on the single biomass particle, relevant to combustion and gasification systems. Special attention is paid to high fidelity numerical models and state-of-the-art experimental techniques that have been developed or employed over recent years to understand different aspects of biomass thermochemical conversion.

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Section: ■ Recent Development In Numerical Modeling Of Biomass Conver...mentioning

confidence: 99%

“…Two- or three-dimensional models can address this issue. Such a modeling approach has been adapted in different studies. ,,− …”

Section: Recent Development In Numerical Modeling Of Biomass Conversionmentioning

confidence: 99%

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Fatehi

Weng

et al. 2021

Energy Fuels

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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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“…By fluid dynamic modelling of the firebox, the internal physical state characteristics can be determined with sufficient accuracy, so that the combustion process can be planned. CFD (Computational Fluid Dynamics) methods are widely used for modelling and monitoring process behaviour [13,14,15]. These simulations are also suitable for testing and improving operation [16,17].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the firebox of a biomass-fired boiler

Tolnai¹

2021

Global J. Eng. Tech. Adv.

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The most common fuel in crop drying is natural gas. Replacing this for renewable energy is both environmentally and economically beneficial. As a by-product of crop cleaning during harvesting, a source of energy suitable for combustion can be obtained from plant parts that are otherwise treated as waste. Solid fuel requires a special fuel system. Our goal is to find an optimized design for cleaning waste based on the existing solid fuel boilers, and in the framework of this work, the optimal design of the fire box passages is our narrower goal. To do this, we use CFD modelling, which is used to estimate the flow characteristics based on a 3D model in addition to the known operating parameters. By modifying the geometry between given boundaries, we find the ideal design within the boundaries allowed by the construction.

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An Eulerian model for the simulation of the thermal conversion of a single large biomass particle

Cited by 21 publications

References 45 publications

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

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

Optimization of the firebox of a biomass-fired boiler

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