A detailed chemical kinetic model of high-temperature ethylene glycol gasification

Hafner, Simon; Rashidi, Arash; Baldea, Georgiana; Riedel, Uwe

doi:10.1080/13647830.2010.547602

Cited by 14 publications

(13 citation statements)

References 23 publications

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“…The one-third rule has been applied for the gas film temperature, as has been often recommended in the literature. 20 The Sherwood number correlation 1) max (1, ) 1/3 0.077 (7) has been taken from Clift et al, 21 where Re and Sc are the Reynolds number and the Schmidt number, respectively. The convective heat-transfer coefficient (h) is determined via the Nusselt number (Nu).…”

Section: Modeling Liquid or Slurry Fuels In The Gasmentioning

confidence: 99%

A Sectional Approach for the Entrained-Flow Gasification of Slurry Fuels

2018

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Energy densification is the overall objective of the on-going bioliq project. Bioslurry, obtained via fast pyrolysis of low-grade biogenic resources, is converted into high quality syngas in a high pressure entrained flow gasifier. The modeling of this three-phase system involving high pressure and high temperature sub-processes is very challenging. The detailed representation of the chemical sub-processes goes along with an increase of the computational cost. In this work, a novel approach is developed to achieve fast and accurate Computational Fluid Dynamics (CFD) simulations of the gasification of a slurry fuel in a laboratory entrained flow gasifier under atmospheric pressure. The method investigated relies on a sectional approach to describe the char gasification. An Euler-Euler approach is used for the modeling of the slurry/gas phase system. Ethylene glycol is used to represent the liquid part of the slurry. Experimental

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Section: Modeling Liquid or Slurry Fuels In The Gasmentioning

confidence: 99%

A Sectional Approach for the Entrained-Flow Gasification of Slurry Fuels

2018

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“…Reaction zone and char luminosity inside REGA recorded with fish-eye lens without laser illumination (top). Averaged incandescence of soot particles in the laser sheet (bottom) following pulsed excitation calculations based on different ethylene glycol chemical reaction models [91] enable identifying the most adequate model for the mixture, temperature and pressure conditions encountered in the gasifier.…”

Section: Detailed Modelling Of Single Physical Processes Using Large Eddy Simulations (Les)mentioning

confidence: 99%

Tackling the challenges in modelling entrained-flow gasification of low-grade feedstock

Kolb¹,

Aigner²,

Kneer

et al. 2016

Journal of the Energy Institute

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“…For example, ethylene glycol is used as a single component surrogate to represent real biomass pyrolysis oil stemming from straw or agricultural by-products. [22][23][24][25] The hetero-polymers present in these feed stock result in high oxygen content pyrolysis oil. Therefore, a high oxygen content surrogate is necessary.…”

Section: Introductionmentioning

confidence: 99%

“…The rate constants of analogous reactions with ethanol in the ethylene glycol mechanism can be estimated based on the ethanol rate constants. 23 Also, for experimental studies, ethylene glycol has the advantages of low cost and safety. 26 Even with the simplification of a surrogate fuel, the detailed mechanisms are still too large to be efficiently used in two dimensional simulations of gasification processes as a result of their large CPU time demand.…”

Section: Introductionmentioning

confidence: 99%

Modeling Study of the Entrained Flow Gasification of Ethylene Glycol, a Surrogate Fuel for a Pyrolysis Oil

2019

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The complex composition of pyrolysis oils makes it challenging to develop detailed reaction mechanisms to model the fuel's gasification chemistry. As a solution, surrogate fuels with a few chemical components with similar behavior to pyrolysis oils in terms of fundamental combustion properties and major physical properties can be used to model the fuel's gasification chemistry. In the present work, ethylene glycol is selected as a single component surrogate for the pyrolysis oil because of its similar chemical and physical properties to pyrolysis oil. However, even with this simplification, the detailed chemical kinetic mechanism for ethylene glycol available in literature is still too large to allow its efficient use in two-dimensional simulations. Therefore, in the present work, a reduced reaction mechanism has been developed for describing the gasification chemistry of ethylene glycol. This mechanism was first validated by computing ignition delay times and laminar flame speeds of several relevant species and by comparing the calculated values against published experimental data. Overmore, the developed reduced reaction mechanism was used to perform a CFD simulation of the Research Entrained Flow Gasifier (REGA) operated at the Karlsruhe Institute of Technology (KIT). The mechanism was further validated by comparing the simulation results with published experimental data from the REGA experiments. In all validation computations, the developed reduced chemical kinetic reaction mechanism showed very good agreement with the experimental data. Also, the validated reduced reaction model was used to perform a parameter study for typical REGA conditions, by investigating its performance with respect to equivalence ratio, fuel preheat temperature, and operating pressure. From this parameter study, it has been found that both the fuel preheat temperature and the operating pressure have a marginal influence on the composition of the syngas produced. The equivalence ratio had the strongest effect on the syngas composition, with an almost linear variation in the investigated equivalence ratio range.

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A detailed chemical kinetic model of high-temperature ethylene glycol gasification

Cited by 14 publications

References 23 publications

A Sectional Approach for the Entrained-Flow Gasification of Slurry Fuels

A Sectional Approach for the Entrained-Flow Gasification of Slurry Fuels

Tackling the challenges in modelling entrained-flow gasification of low-grade feedstock

Modeling Study of the Entrained Flow Gasification of Ethylene Glycol, a Surrogate Fuel for a Pyrolysis Oil

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