Cold-cap temperature profile comparison between the laboratory and mathematical model - 15591

Conference · Wed Jul 01 00:00:00 EDT 2015

OSTI ID:22824452

Dixon, Derek R.; Schweiger, Michael J.; Riley, Brian J. ^[1]; Pokorny, Richard ^[2]; Hrma, Pavel ^[1]

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1. Pacific Northwest National Laboratory, Richland, WA 99354 (United States)
2. Department of Chemical Engineering, Institute of Chemical Technology Prague, Technicka 5, 166 28 Prague 6 (Czech Republic)

The rate of waste vitrification in an electric melter is connected to the feed-to-glass conversion process, which occurs in the cold cap, a layer of reacting feed on top of molten glass. The cold cap consists of two layers: a low-temperature (∼100 deg. C - ∼800 deg. C) region of unconnected, reacting feed and a high-temperature (∼800 deg. C - ∼1100 deg. C) region of molten glass with gas bubbles and cavities. A recently developed mathematical model describes the effect of the cold cap on glass production. For verification of the mathematical model, a cold cap produced in a laboratory-scale melter was subsequently analyzed by correlating structural features of a polished region with those obtained in heat-treated feed samples to determine the temperature profile as a function of cold-cap position. After corrections were made for the diminished volume of bubbles and collapsed cavities that occurred in the cold-cap sample during cooling, the temperature gradients were alike in the model and the laboratory cold cap through the range from ∼500 deg. C to ∼1100 deg. C. The temperature profiles were different in the upper region of the cold cap because the radiant heat from the molten glass in the laboratory-scale melter resulted in dry and hot (∼400 deg. C) surface conditions whereas the model assumed a surface covered by boiling slurry. (authors)

• Research Organization: WM Symposia, Inc., PO Box 27646, 85285-7646 Tempe, AZ (United States)
• OSTI ID: 22824452
• Report Number(s): INIS-US-19-WM-15591; TRN: US19V1024069498
• Resource Relation: Conference: WM2015: Annual Waste Management Symposium, Phoenix, AZ (United States), 15-19 Mar 2015; Other Information: Country of input: France; 18 refs.; available online at: http://archive.wmsym.org/2015/index.html
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BOILING
BUBBLES
CAVITIES
COMPARATIVE EVALUATIONS
COOLING
EXPERIMENTAL DATA
GLASS
HEAT TREATMENTS
MATHEMATICAL MODELS
SLURRIES
TEMPERATURE GRADIENTS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
VERIFICATION
VITRIFICATION
WASTES