CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > CONVERGE

Char combustion in converge

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 18, 2020, 00:47
Default Char combustion in converge
  #1
New Member
 
Asher
Join Date: Jun 2020
Posts: 1
Rep Power: 0
mohmdasher is on a distinguished road
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.
mohmdasher is offline   Reply With Quote

Old   July 7, 2020, 16:08
Default Char combustion
  #2
New Member
 
Hemanth reddy
Join Date: Jul 2020
Posts: 1
Rep Power: 0
hemanthr417 is on a distinguished road
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.
hemanthr417 is offline   Reply With Quote

Reply

Tags
coal combustion, conjugate heat trans., porous body, species equations, surface reactions

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Coal Combustion DPM Mechanism Problem Brandon Han FLUENT 4 June 9, 2020 22:24
Foam::error::printStack(Foam::Ostream&) with simpleFoam -parallel U.Golling OpenFOAM Running, Solving & CFD 42 May 22, 2020 12:20
Hardware recommendation for combustion solvers - Forte - Converge kstuart Hardware 17 April 27, 2020 23:01
DPM for char combustion mighelone FLUENT 1 November 4, 2013 12:12
Problem with run continue of a custom solver Hisham OpenFOAM Programming & Development 1 January 23, 2013 09:36


All times are GMT -4. The time now is 17:26.