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Effect of melter feed foaming on heat flux to the cold cap
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SYSNO ASEP 0480534 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of melter feed foaming on heat flux to the cold cap Author(s) Lee, S. (US)
Hrma, P. (US)
Pokorný, R. (CZ)
Kloužek, Jaroslav (USMH-B) RID, ORCID, SAI
VanderVeer, B.J. (US)
Dixon, D.R. (US)
Luksic, S.A. (US)
Rodriguez, C.P. (US)
Chun, J. (US)
Schweiger, M. J. (US)
Kruger, A.A. (US)Source Title Journal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
Roč. 496, DEC 1 (2017), s. 54-65Number of pages 12 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords cold cap ; foam layer ; heat flux ; heat conductivity ; evolved gas Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics Institutional support USMH-B - RVO:67985891 UT WOS 000414205500006 EID SCOPUS 85028614020 DOI 10.1016/j.jnucmat.2017.09.016 Annotation The glass production rate, which is crucial for the nuclear waste clean up lifecycle, is influenced by the chemical and mineralogical nature of melter feed constituents. The choice of feed materials affects both the conversion heat and the thickness of the foam layer that forms at the bottom of the cold cap and controls the heat flow from molten glass. We demonstrate this by varying the alumina source, namely, substituting boehmite or corundum for gibbsite, in a high-alumina high-level-waste melter feed. The extent of foaming was determined using the volume expansion test and the conversion heat with differential scanning calorimetry. Evolved gas analysis was used to identify gases responsible for the formation of primary and secondary foam. The foam thickness, a critical factor in the rate of melting, was estimated using known values of heat conductivities and melting rates. The result was in reasonable agreement with the foam thickness experimentally observed in quenched cold caps from the laboratory scale melter.
Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2018
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