✦ LIBER ✦

The effects of non uniform burn off on the kinetics of oxidation of large tubular specimens of graphite

✍ Scribed by P. Hawtin; R.A. Huber

Publisher: Elsevier Science
Year: 1968
Tongue: English
Weight: 738 KB
Volume: 6
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(68)90073-0

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✦ Synopsis

The course of an experimental oxidation of a tubular specimen of nuclear grade graphite, in which oxygen access is confined to the bore of the tube, has been simulated using a previously derived mathematical model. The conditions chosen for the simulation were such that a marked burn off profile developed during the course of a run. The results thus generated were used in an inverse calculation to derive overall estimates for the chemical reactivity, utilisation efficiency and the effective diffusion coefficient. These estimates were compared with the corresponding values for a uniformly burnt off piece of graphite. It was shown that under the conditions examined (oxygen concentration at external graphite surface > 5 per cent of the bore value, overall burn off < 9 per cent) the effect of the non uniformity in the burn off profile was negligible and that properties applicable to uniformly burnt off material could be used.

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