Numerical study of the conversion time of single pyrolyzing biomass particles at high heating conditions

Haseli, Yousef; Oijen, van Ja Jeroen; Goey, de Lph Philip

doi:10.1016/j.cej.2011.02.073

Cited by 43 publications

(38 citation statements)

References 27 publications

(86 reference statements)

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“…Isolated experimental investigation into pyrolysis reactions and kinetics is extremely difficult due to several factors, such as, fast reactions, short residence times, high temperatures and transport limitations. Additionally, due to lack of knowledge of the reaction chemistry, studies investigating transport effects assumed few pseudo and lumped reactions (with fitted kinetic parameters) for pyrolysis (Blasi, 1996;Di Blasi, 1996;Hagge and Bryden, 2002;Chaurasia, 2004a, 2004b;Chaurasia and Kulkarni, 2007;Zabaniotou and Damartzis, 2007;Sadhukhan et al, 2008;Sreekanth and Leckner, 2008;Sadhukhan et al, 2009;Dufour et al, 2011;Haseli et al, 2011aHaseli et al, , 2011bHaseli et al, , 2012aHaseli et al, , 2012bPeters, 2011;Anca-Couce and Zobel, 2012;Blondeau and Jeanmart, 2012;Lin et al, 2012;Okekunle et al, 2012;Sharma et al, 2014). The prediction capability of such models remains very limited.…”

Section: Technological Challenges In Developing Biomass Conversion Tementioning

confidence: 98%

Multiscale molecular modeling can be an effective tool to aid the development of biomass conversion technology: A perspective

Mushrif

Vasudevan

Krishnamurthy

et al. 2015

Chemical Engineering Science

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Section: Technological Challenges In Developing Biomass Conversion Tementioning

confidence: 98%

Multiscale molecular modeling can be an effective tool to aid the development of biomass conversion technology: A perspective

Mushrif

Vasudevan

Krishnamurthy

et al. 2015

Chemical Engineering Science

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“…In order to examine these phenomena, robust coupled transient models describing the transport, kinetics, and thermochemistry are required. Numerous 1D and 2D physico-chemical models exist in the literature that describe single particle pyrolysis at high temperatures (400-700 ○ C) [12][13][14][15][16]. However, compared to torrefaction, pyrolysis at these high temperature results in partial to complete devolatilization (70-90 wt%) and different thermal degradation pathways are expected.…”

Section: Introductionmentioning

confidence: 99%

Modeling kinetics-transport interactions during biomass torrefaction: The effects of temperature, particle size, and moisture content

Bates

Ghoniem

2014

Fuel

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ABSTRACT:A comprehensive one-dimensional model accounting for the effects of heat and mass transfer, chemical kinetics, and drying was developed to describe the torrefaction of a single woody biomass particle. The thermochemical sub-models depend only on previously determined or measured characteristics, avoiding the use of fitting or tuning parameters and enabling a rigorous energy balance of the process. Moreover, a high temperature drying sub-model is introduced which overcomes the difficulties associated with existing approaches to give physically consistent results, smooth implementation, and numerical stability. The particle model was validated against experimental data from the literature for intraparticle temperature profiles, particle mass and energy yields over a range of particle sizes and reaction temperatures. The modeling results describe well the three distinct stages observed during the torrefaction of large particles including the heatup, drying, heat release due to exothermic reactions resulting in thermal overshoot, followed by thermal equilibrium where conversion is governed by mass loss kinetics. The nonlinear effects of particle size, temperature, moisture content, and residence time on the mass and energy yields are quantified and explained. Larger particles exhibit a significant internal temperature gradient and strong temperature overshoot especially at the centerline. The magnitude of the overshoot is a function of the conductivity, particle size, and average heat release rate. Because of the rise in the reaction rate, higher temperatures increase the sensitivity of the process to particle size. Due to the dependence of drying rate on heat transfer limitations, the sensitivity of torrefaction to initial moisture content increases strongly with particle size. Highlights: 1D coupled model describes the dynamics of drying and torrefaction of a single particle  Model predicts particle temperature overshoot, elemental, and energy balance  Validated against single particle experimental results from literature  Larger particles convert more non-uniformly with higher thermal overshoot.  Higher temperatures and increased moisture content exacerbate particle size effects

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“…In previous studies on the coking chamber temperature distribution [6,7,18], the classical heat transfer model did not take into consideration the pyrolytic heat, chemical reaction heat, and condensation heat [29]. The effective thermal conductivity coefficient λ i includes the three stages: the coal/coke hybrid thermal conductivity λ hybrid stage, coal/ coke comprehensive thermal conductivity λ i , coal/coke stage, and semicoke thermal conductivity λ coke stage.…”

Section: Corrected Effective Thermal Conductivitymentioning

confidence: 99%

Lignite temperature distribution during low temperature carbonization process in an industrial width carbonization furnace

Wang

Zhang

et al. 2016

Fuel Processing Technology

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Numerical study of the conversion time of single pyrolyzing biomass particles at high heating conditions

Cited by 43 publications

References 27 publications

Multiscale molecular modeling can be an effective tool to aid the development of biomass conversion technology: A perspective

Multiscale molecular modeling can be an effective tool to aid the development of biomass conversion technology: A perspective

Modeling kinetics-transport interactions during biomass torrefaction: The effects of temperature, particle size, and moisture content

Lignite temperature distribution during low temperature carbonization process in an industrial width carbonization furnace

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