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Modeling of single char combustion, including CO oxidation in its boundary layer
The combustion of a char particle can be divided into a transient phase where its temperature increases as it is heated by oxidation, and heat transfer from the surrounding gas to an approximately constant temperature stage where gas phase reaction is important and which consumes most of the carbon and an extinction stage caused by carbon burnout. In this work, separate models were developed for the transient heating where gas phase reactions were unimportant and for the steady temperature stage where gas phase reactions were treated in detail. The transient char combustion model incorporates intrinsic char surface production of CO and CO{sub 2}, internal pore diffusion and external mass and heat transfer. The model provides useful information for particle ignition, burning temperature profile, combustion time, and carbon consumption rate. A gas phase reaction model incorporating the full set of 28 elementary C/H/O reactions was developed. This model calculated the gas phase CO oxidation reaction in the boundary layer at particle temperatures of 1250 K and 2500 K by using the carbon consumption rate and the burning temperature at the pseudo-steady state calculated from the temperature profile model but the transient heating was not included. This gas phase model can predict …
Date:
October 25, 1994
Creator:
Lee, C. H.; Longwell, J. P. & Sarofim, A. F.
System:
The UNT Digital Library
Acceptance test procedure for tank bottom thermocouples on Tank 241-SY-101. Revision 2
None
Date:
October 25, 1994
Creator:
Zuehlke, A. C.
System:
The UNT Digital Library
CDMS: CAD data set system design description. Revision 1
None
Date:
October 25, 1994
Creator:
Gray, E. L.
System:
The UNT Digital Library
System design description, PFP low level waste treatment facility
None
Date:
October 25, 1994
Creator:
Bershaw, D. M.
System:
The UNT Digital Library
Acceptance test procedure, 241-SY-101 flexible receiver system, Phase II testing
None
Date:
October 25, 1994
Creator:
Ritter, G. A.
System:
The UNT Digital Library
Shielding of Multi-Leg Penetrations into the RHIC Collider
None
Date:
October 25, 1994
Creator:
J., Gollon P.
System:
The UNT Digital Library