Influence of biomass furnace volume change on flue gases burn out process

Djurovic, D.; Nemoda, Stevan; Repić, Branislav; Dakić, Dragoljub; Adzic, M Miroljub

doi:10.1016/j.renene.2014.11.007

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Gas-phase combustion can be modeled using turbulence-chemistry interaction submodels, commonly performed using species transport methods (i.e., FRK/EDM and EDC) . The modified version of eddy breakup (EBU) models, which is known as finite-rate kinetic/eddy dissipation model (FRK/EDM), has been widely employed for modeling a variety of combustion systems, because of its high stability and low computational cost. − FRK/EDM calculates both kinetics and mixing rates of reaction where the lowest of the two reaction rates determines whether the combustion reaction is kinetically limited or mixing limited. For this model, detailed reactions chemistry is not considered for mixing-limited conditions.…”

Section: Introductionmentioning

confidence: 99%

Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 1: Assessment of the Model Coefficients

Farokhi

Birouk

2016

Energy Fuels

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The eddy dissipation concept (EDC) model has the ability to incorporate detailed chemistry in turbulent combustion, which makes it attractive for simulating a wide range of industrial combustion systems. However, its application for modeling weakly turbulent reacting flows and slow chemistry poses a real challenge. The present study examines the influence of the EDC model’s coefficients, with respect to turbulent flow field characteristics. In order to assess the sensitivity of EDC model’s constants, simulations of two distinct jet flames covering weakly and highly turbulent flow conditions are performed. The predictions are compared with published experimental measurements. The findings of this study revealed that EDC predictions of the characteristics of weakly turbulent reacting flow can be improved by changing the model’s constants. The study also showed that, in comparison with the standard EDC, modifying the model’s coefficients produced improved predictions of the characteristics of highly turbulent reacting flow regions. The conclusions of the analysis carried out in this study are used to simulate the gas-phase combustion of a small-scale biomass furnace using the EDC model, which is presented in the companion paper for this study.

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Section: Introductionmentioning

confidence: 99%

Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 1: Assessment of the Model Coefficients

Farokhi

Birouk

2016

Energy Fuels

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“…In the present work, for simplification, we considered AF as a spherical particle; also, the AF and coal particles were modeled separately with two discrete phases following a Rosin-Rammler size distribution [11]. The particles were tracked in Lagrangian frame reference using a stochastic model [12] as shown in Equation (5).…”

Section: Particle-phase Governing Equationsmentioning

confidence: 99%

“…Although much work [2][3][4][5][6] has been done on AF co-combustion, few researches on CFD (computational fluid dynamic) modeling of co-firing AF under rotary cement kiln burner conditions are available in the literature. Even though the efficiency of different K-epsilon models has been improved in recent years on predicting PF combustion, most improvements have been achieved by minimizing the calculation cost.…”

Section: Introductionmentioning

confidence: 99%

Coal and Biomass Co-Combustion: CFD Prediction of Velocity Field for Multi-Channel Burner in Cement Rotary Kiln

Ngadi

Lahlaouti

2020

The 14th International Conference on Interdisciplinarity in Engineering—INTER-Eng 2020

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This paper represents the medialization of alternative fuels co-combustion, in a cement rotary kiln, established on the commercial computational fluid dynamic (CFD) software ANSYS FLUENT. The focus is placed on the key issues in the flow field, mainly on how they are affected by turbulence models and co-processing conditions. Real data, from a Moroccan cement plant, are used for model input. The simulation results have shown a potential effect of the physics model on turbulent and gas-solid flow prediction. The CFD results can be taken as a guideline for improved co-processing burner design and reduce the effect of using alternative fuels.

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“…An interface is usually used between the bed and freeboard to share and couple the data between the bed and freeboard. , The biomass combustion process in the freeboard is commonly modeled using species transport models [i.e., finite-rate kinetic/eddy dissipation model (FRK/EDM) or eddy dissipation concept (EDC)] . FRK/EDM is employed to model a variety of combustion applications. ,− For FRK/EDM, both mixing and kinetic reaction rate are computed at each computational cell and the lower value determines if the combustion is either kinetically or mixing limited. FRK/EDM is known by its high stability and low cost of calculation but also by its main handicap in accounting for detailed chemistry of reactions for mixing limited flow regions, which implies that intermediate species and pollutants, such as CO and NO x , cannot be accurately predicted.…”

Section: Introductionmentioning

confidence: 99%

Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 2: Gas-Phase Combustion Modeling of a Small-Scale Fixed Bed Furnace

Farokhi

Birouk

2016

Energy Fuels

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Small-scale grate-firing biomass furnaces suffer from high levels of pollutant emissions caused mainly by a low level of air/fuel mixing and a short residence time for combustion as a result of their small volume. Reliable gas-phase combustion modeling is key for improving the design of these systems. The present work describes a computational fluid dynamics study of biomass combustion using the modified eddy dissipation concept (EDC) model. Part 1 (10.1021/acs.energyfuels.6b01947) of this study focused on examining the main challenges of the EDC model regarding its application for modeling weakly turbulent and slow-chemistry reacting flows. In addition, a sensitivity analysis was carried out on the constants of the model for modeling non-premixed combustion at weakly and highly turbulent reacting flow conditions. Using the conclusions of the analysis of part 1 (10.1021/acs.energyfuels.6b01947), gas-phase combustion of a small lab-scale grate-firing biomass furnace is simulated in the present paper (part 2). The results revealed that the modified EDC model produced reasonable predictions of the temperature and gas emissions.

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Influence of biomass furnace volume change on flue gases burn out process

Cited by 13 publications

References 8 publications

Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 1: Assessment of the Model Coefficients

Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 1: Assessment of the Model Coefficients

Coal and Biomass Co-Combustion: CFD Prediction of Velocity Field for Multi-Channel Burner in Cement Rotary Kiln

Application of Eddy Dissipation Concept for Modeling Biomass Combustion, Part 2: Gas-Phase Combustion Modeling of a Small-Scale Fixed Bed Furnace

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