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Old   June 18, 2020, 00:47
Default Char combustion in converge
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Does converge have the facility to simulate combustion of char/coal? The possible physics involved would me
1. General flow
2. Conjugate heat transfer
3. Mass and specie conservation
4. Solid reactions on a porous solid particle
5. Surface Chemistry
While I'm aware that 1,2,3 can be modelled, any details on 4,5 are appreciated.

Thank you.
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Old   July 7, 2020, 16:08
Default Char combustion
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Oxygen-enhanced and oxygen-fired pulverized coal combustion is actively being investigated to achieve emission reductions and reductions in flue gas cleanup costs, as well as for coal-bed methane and enhanced oil recovery
applications. To fully understand the results of pilot scale tests and to accurately predict scale-up performance
through CFD modeling, accurate rate expressions are needed to describe coal char combustion under these unconventional combustion conditions. In the work reported here, the combustion rates of two pulverized coal chars have
been measured in both conventional and oxygen-enriched atmospheres. A combustion-driven entrained flow reactor equipped with an optical particle-sizing pyrometry diagnostic and a rapid-quench sampling probe has been used
for this investigation. Highvale subbituminous coal and a high-volatile eastern United States bituminous coal have
been investigated, over oxygen concentrations ranging from 6 to 36 mol% and gas temperatures of 1320–1800 K.
The results from these experiments demonstrate that pulverized coal char particles burn under increasing kinetic
control in elevated oxygen environments, despite their higher burning rates in these environments. Empirical fits
to the data have been successfully performed over the entire range of oxygen concentrations using a single-film
oxidation model. Both a simple nth-order Arrhenius expression and an nth-order Langmuir–Hinshelwood kinetic
equation provide good fits to the data. Local fits of the nth-order Arrhenius expression to the oxygen-enriched and
oxygen-depleted data produce lower residuals in comparison to fits of the entire dataset. These fits demonstrate
that the apparent reaction order varies from 0.1 under near-diffusion-limit oxygen-depleted conditions to 0.5 under oxygen-enriched conditions. Burnout predictions show good agreement with measurements. Predicted char
particle temperatures tend to be low for combustion in oxygen-depleted environments. Njmcdirect pay tickets online an online portal that allows you to pay your Traffic ticket from the comfort of your home.
2005 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Last edited by hemanthr417; July 13, 2020 at 10:24.
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coal combustion, conjugate heat trans., porous body, species equations, surface reactions

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