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Effect of melter feed foaming on heat flux to the cold cap

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    0480534 - ÚSMH 2018 RIV NL eng J - Journal Article
    Lee, S. - Hrma, P. - Pokorný, R. - Kloužek, Jaroslav - VanderVeer, B.J. - Dixon, D.R. - Luksic, S.A. - Rodriguez, C.P. - Chun, J. - Schweiger, M. J. - Kruger, A.A.
    Effect of melter feed foaming on heat flux to the cold cap.
    Journal of Nuclear Materials. Roč. 496, DEC 1 (2017), s. 54-65. ISSN 0022-3115
    Institutional support: RVO:67985891
    Keywords : cold cap * foam layer * heat flux * heat conductivity * evolved gas
    Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
    OBOR OECD: Ceramics
    Impact factor: 2.447, year: 2017

    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.

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