Improving Pulverized Coal and Biomass Co‐Combustion in a Cement Rotary Kiln by Computational Fluid Dynamics

Mikulčić, Hrvoje; Cerinski, Damijan; Baleta, Jakov; Wang, Xuebin

doi:10.1002/ceat.201900086

Cited by 16 publications

(9 citation statements)

References 34 publications

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“…Heat transfer can be modeled as three different source terms, i.e., interphase heat transfer, homogeneous reactions, and radiation. Among these, radiation, which has been expressed by the P1 model, is dominant due to the high operating temperature of the combustor [5].…”

Section: Gas Phasementioning

confidence: 99%

“…Van Lare 4 studied the influence of particle size on mass transfer in a fluidized bed. Computational fluid dynamics (CFD) models have also been used to study pulverized coal and biomass co‐firing 5 and different combustor configurations 6, 7. However, the majority of these studies 5–10 propose models with a Reynolds‐averaged Navier‐Stokes (RANS) turbulence modeling and/or in a two‐dimensional way, overlooking turbulence modeling 11.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion

2020

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bed combustion is a very popular technology used to convert solid biomass into thermal energy, which has many advantages over other conversion technologies. However, these advantages strongly depend on the freeboard combustion. This study focuses on the effect of turbulence of the freeboard via developing a comprehensive mathematical model including four-way coupling, biomass thermal decomposition, and turbulent combustion by means of an Eulerian-Lagrangian framework. The validated model predicts with significant accuracy for all gas species when turbulence modeling is improved. The optimum amount of the secondary air ratio and the optimum excess air ratio were determined, which give a higher freeboard temperature while maintaining minimum emission.

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Section: Gas Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion

2020

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“…Cement production is a major source of environmental pollution due to high energy consumption and pollutant emissions [1][2][3]. To reduce its impact, studies have focused on using waste-derived fuels and biomass, as well as oxy-fuel and oxy-coal combustion technologies.…”

Section: Introductionmentioning

confidence: 99%

An Industrial-Scale Cement Rotary Kiln CFD Model to Characterise Alternative Fuel Combustion Profiles

Moreno

Castán-Lascorz

Tavares³

2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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This work proposes a Computational Fluid Dynamics (CFD) model of a cement rotary kiln capable of reproducing some 3D effects which cannot be solved by simpler models. Specifically, flight behaviour and falling position of fuels particles are captured. Furthermore, detailed combustion chemistry (devolatilization, char combustion and moisture evaporation) is solved. The 64-meter-long kiln burns a blend of petcoke and Refuse Derived Fuel (RDF). Both were characterized and their properties introduced in the model. The clinker bed was simplified by fixing a temperature profile, a typical approach in literature. Different air excess numbers (λ) were simulated to assess the impact on flight of particles and combustion profiles. The resulting combustion profiles give a valuable input to simpler models in which a much larger and faster set of simulations can be performed, allowing kiln operators to run several different operational scenarios.

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“…Owing to that, it is necessary to correctly calculate radiative heat transfer for the participating radiative medium in combustion systems 5 . In addition to developing complex numerical models, the increasing research in alternative fuels that feature lower emissions is present, such as research on alternative fuels in the transportation sector made from waste, 6 torrefied biomass, 7 biomass oils, 8 and ammonia 9 …”

Section: Introductionmentioning

confidence: 99%

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Jurić

Coelho

Priesching

et al. 2022

Intl J of Energy Research

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Summary It is well‐known that the pollutant formation processes and temperature distribution in various combustion systems that operate at high temperatures are influenced by radiation heat transport. Detailed modeling of radiation transport in internal combustion (IC) engines demands additional computational power, and hence the calculation of radiation phenomenon is not commonly applied in IC engines. At the same time, current operating conditions in IC engines consider high temperatures and recirculation of exhaust gases that enhance gas radiation. Therefore, the application of radiation models is needed to increase the correctness of radiative absorption, combustion characteristics, and the formation of pollutant emissions. In this paper, the implementation and validation of the spectral line‐based weighted‐sum‐of‐gray‐gases (SLW) model for calculating soot and gas radiation are performed. The SLW model is implemented in the computational fluid dynamics code AVL FIRE by programable user routines. The radiative transfer equation was calculated employing the finite volume method applicable for multiprocessing, moving meshes, and a mesh rezone procedure required for IC engine modeling. The validation of the SLW model is performed on one‐dimensional geometric cases that include analytical results of radiation intensity, for which agreement within 10% of the relative error was achieved. Additionally, the SLW model is applied to compression ignition engine simulations, where the obtained results are compared with the measured pressure and concentrations of NO and soot emissions. The calculated heat losses through the wall boundary layer were around 12% of the total fuel energy, approximately 9.5% of the total fuel energy was lost due to the convective flow. 7%–8% of convection heat loss was due to the higher emission than absorption of participating CO2 and H2O gasses, and the rest are net soot losses. For the observed operating cases, the computational time is increased nearly double for SLW model than in the simulation without radiation. Finally, the results calculated using SLW indicate an improved agreement with the experimental mean pressure, temperature, soot, and NO concentrations compared to simulations without radiation.

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Improving Pulverized Coal and Biomass Co‐Combustion in a Cement Rotary Kiln by Computational Fluid Dynamics

Cited by 16 publications

References 34 publications

Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion

Effect of Turbulence of the Freeboard on Fluidized‐Bed Biomass Combustion

An Industrial-Scale Cement Rotary Kiln CFD Model to Characterise Alternative Fuel Combustion Profiles

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

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