A hybrid EDC/Flamelet approach for modelling biomass combustion of grate-firing furnace

Farokhi, Mohammadreza; Birouk, Madjid

doi:10.1080/13647830.2019.1587177

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…Chen et al extended the eddy dissipation concept model for LES. Several numerical studies have already applied their model with a global mechanism. , Farokhi and Birouk developed the hybrid eddy dissipation concept/flamelet approach and applied it for the combustion simulation of a grate-firing furnace. The authors suggested the suitability of their model for biomass combustion and low computational cost.…”

Section: Coupling Kinetic Model With Cfdmentioning

confidence: 99%

A Review on Detailed Kinetic Modeling and Computational Fluid Dynamics of Thermochemical Processes of Solid Fuels

et al. 2021

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This review presents the recent advances in computational approaches to understand thermochemical reactions of solid fuels with minimized empirical factors. It includes studies on kinetic modeling of gas-phase reactions of multicomponent molecular mixtures of volatiles derived from primary pyrolysis of solid fuels using a database for elementary reactions. Mechanistic studies to model the devolatilization of biomass and coal upon heating are also mentioned. The efforts to integrate the kinetic model with computational fluid dynamics to understand the flow and heat transfer behavior of industrial reactors for solid fuel conversions, including gasification and combustion, are reviewed. These advances are primarily based on the conventional forward analysis that provides a deeper understanding of chemically reacting flows of fuels undergoing thermochemical reactions. For the further development of the thermochemical conversion technology, it can be expected to develop alternative approaches such as inverse analysis to determine the optimal reactor design and operating conditions.

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Section: Coupling Kinetic Model With Cfdmentioning

confidence: 99%

A Review on Detailed Kinetic Modeling and Computational Fluid Dynamics of Thermochemical Processes of Solid Fuels

et al. 2021

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“…This method was successfully employed for the overbed modeling in the biomass combustors and validated via experiment. 11,40,225 NO x formation modeling is a complex process including too many reactions, and an efficient model would be hard to achieved by taking all reactions into account; hence, reducing the number of gas-phase reaction is inevitably essential to make a balance between the accuracy and computational cost.…”

Section: Pollutant Formation Mechanismsmentioning

confidence: 99%

“…This approach can be entirely modeled within commercial software such as Fluent or OpenFOAM. This method, also called porous media (traditional), is a CFD model which, although it is not an expensive method, is not appropriate for sensitive analysis of bed characteristics. ,− The second approach measures the bed conversion of the combustion system as a function of the location in the fuel bed. Subsequently, the temperature and velocity of gases, as well as the species concentration entering the overbed, can be determined in terms of mass and heat balances between the fuel and primary air. − Although the experiment-based method performance evaluation is highly prevalent in the analysis of the grate biomass boilers, it is an expensive practice that is not able to deliver the sensitivity needed in order to evaluate the bed conversion process.…”

Section: Modeling and Cfd Simulationmentioning

confidence: 99%

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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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Generalised Eddy Dissipation Concept for MILD combustion regime at low local Reynolds and Damköhler numbers. Part 1: Model framework development

Lewandowski

Parente

Pozorski

2020

Fuel

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A hybrid EDC/Flamelet approach for modelling biomass combustion of grate-firing furnace

Cited by 8 publications

References 56 publications

A Review on Detailed Kinetic Modeling and Computational Fluid Dynamics of Thermochemical Processes of Solid Fuels

A Review on Detailed Kinetic Modeling and Computational Fluid Dynamics of Thermochemical Processes of Solid Fuels

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

Generalised Eddy Dissipation Concept for MILD combustion regime at low local Reynolds and Damköhler numbers. Part 1: Model framework development

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