A Large Eddy Simulation Study on the Effect of Devolatilization Modelling and Char Combustion Mode Modelling on the Structure of a Large-Scale, Biomass and Coal Co-Fired Flame

Rabaçal, M.; Costa, Mário; Vascellari, Michele; Hasse, Christian; Rieth, Martin; Kempf, Andreas

doi:10.1155/2018/7036425

Cited by 12 publications

(7 citation statements)

References 41 publications

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“…Bio-CPD model predictions slightly underestimated the total volatile yield. The CPD model was then incorporated into a scheme to calibrate first-order and distributed activation energy models for a LES of a furnace fired by coal and blends of straw and coal . Volatile combustion was modeled with a two-step global reaction combined with the eddy breakup model .…”

Section: Extension Of the Cpd Model To Additional Fuelsmentioning

confidence: 99%

“…The CPD model was then incorporated into a scheme to calibrate first-order and distributed activation energy models for a LES of a furnace fired by coal and blends of straw and coal. 171 Volatile combustion was modeled with a two-step global reaction combined with the eddy breakup model. 172 The devolatilization model was shown to have a large impact on the flame structure but not flame lift-off.…”

Section: Extension Of the Cpd Model To Additional Fuelsmentioning

confidence: 99%

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Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Fletcher

2019

Energy Fuels

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The chemical percolation devolatilization (CPD) model for coal pyrolysis was first published in 1989, and a completed version that included the vapor–liquid equilibrium model and cross-linking model was published in 1992. The CPD model was one of three pyrolysis models developed using a lattice model to account for the chemical structure of the coal and was directly based on solid-state 13C nuclear magnetic resonance (NMR) measurements of the coal structure. A correlation of coal structure parameters measured by NMR spectroscopy was performed to permit use of the CPD model to determine pyrolysis rates and yields of tars and light gases for any coal type. A separate nitrogen release model was also developed on the basis of the chemical structure. In the past 30 years, the CPD model or the concepts in the CPD model have been used to describe pyrolysis in many situations for many fuels. The CPD model has been incorporated directly into simulations of large coal combustors as well as detailed simulations of single-pyrolyzing or burning coal particles, which was the original intent. Some investigators added a more rigorous treatment of light gas release. Other investigators have used the CPD model to determine rate coefficients for simpler models for a given range of heating conditions. In addition, the concepts in the CPD model have been used to develop models for other solid fuels, including biomass, black liquor, oil shale, rigid foams, propellants, heavy oil, asphalt, and scrap tires. The CPD model has also been extended to low heating rates for underground coal thermal treatment and hydropyrolysis. This paper is a review of the development, improvement, and uses of the CPD model, along with extended uses of the concepts in the CPD model.

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Section: Extension Of the Cpd Model To Additional Fuelsmentioning

confidence: 99%

Section: Extension Of the Cpd Model To Additional Fuelsmentioning

confidence: 99%

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Fletcher

2019

Energy Fuels

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“…Char particle radius and apparent density are usually important real-time variables to be acquired in the reactor-scale simulation of gasification/combustion process, and the development of char particle conversion sub-models depends closely on the particle conversion mode (Haugen et al 2015;Kaushal et al 2010;Rabaçal et al 2018). In zone I conversion regime, the particle reacts uniformly throughout its volume, where the particle size keeps unchanged and the apparent density varies proportionally to the particle conversion degree.…”

Section: Structural Evolutionmentioning

confidence: 99%

Modeling of Single Porous Char Particle Gasification in Supercritical Water

Fan

Zhao

et al. 2021

Transp Porous Med

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“…But there is a lack of an accurate model which could well reproduce the tobacco pyrolysis behaviors for a wide range of tobacco types and heating conditions. On the other hand, tobacco could be regarded as a special type of biomass with different chemical compositions. , Regarding the modeling of biomass pyrolysis, there have been some advanced network models reported, such as the biochemical percolation devolatilization model (Bio-CPD), − functional group-depolymerization vaporization cross-linking, and FLASHCHAIN models . These well-established network models worked well for common biomass types, but their performances on tobacco pyrolysis are still unclear.…”

Section: Introductionmentioning

confidence: 99%

Toba-CPD: An Extended Chemical Percolation Devolatilization Model for Tobacco Pyrolysis

et al. 2022

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Tobacco features chemical compositions different from that of raw lignocellulosic biomass. Currently, the performance of network models, like Bio-Chemical Percolation Devolatilization (Bio-CPD), on tobacco pyrolysis is unclear, and only global kinetics have been proposed for tobacco devolatilization, which does not have the versatility for a wide range of heating conditions and tobacco types. To address this issue, the present work first assessed the performance of the Bio-CPD model on tobacco pyrolysis through an a priori study, which showed large deviations. Afterward, an extended Chemical Percolation Devolatilization model for tobacco pyrolysis (Toba-CPD) was developed by modifying the kinetic parameters using a grid-search optimization strategy. The process of grid-search optimization strategy is based on the kinetic parameters of the Bio-CPD model and modified with experimental results of 11 tobacco types under a wide range of heating rates. Finally, the performance of Toba-CPD was measured with experimental results which were not used during parameters optimization. Results demonstrated that the Toba-CPD models could well reproduce the pyrolysis of various tobacco types under a wide range of heating rates (R 2 > 0.957).

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A Large Eddy Simulation Study on the Effect of Devolatilization Modelling and Char Combustion Mode Modelling on the Structure of a Large-Scale, Biomass and Coal Co-Fired Flame

Cited by 12 publications

References 41 publications

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Review of 30 Years of Research Using the Chemical Percolation Devolatilization Model

Modeling of Single Porous Char Particle Gasification in Supercritical Water

Toba-CPD: An Extended Chemical Percolation Devolatilization Model for Tobacco Pyrolysis

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