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Title: Heat transfer from glass melt to cold cap: Melting rate correlation equation

Journal Article · · International Journal of Applied Glass Science
DOI: https://doi.org/10.1111/ijag.12666 · OSTI ID:1472198
 [1]; ORCiD logo [2];  [1];  [3]
  1. Pacific Northwest National Laboratory Richland, Washington
  2. Laboratory of Inorganic Materials Joint Workplace of the University of Chemistry and Technology Prague, and the Institute of Rock Structure and Mechanics of the ASCR Prague Czechia
  3. U.S. Department of Energy, Office of River Protection Richland WA 99352.

Abstract The efficiency of all‐electric melters is a hot topic not only in the waste glass melting industry, but also in the commercial melting industry, where stringent environmental regulations and rapid development of renewable energy ask for transformation of current technologies. The heat transfer for the batch conversion into molten glass is controlled by convection and conduction in the thermal boundary layer on the melt side, and by the properties of the foam layer at the batch/melt boundary. An overview of factors affecting heat transfer is presented and assessed using data from laboratory‐ and pilot‐scale experiments. Aside from increasing the melter operating temperature, the heat flux can be enhanced by (a) lowering glass melt viscosity, (b) decreasing the temperature at which the foam collapses at the cold cap bottom, and (c) increasing the melt convection. Although the melt viscosity depends on glass composition, limited by the desired product properties, the understanding of foaming behavior can guide the selection of batch materials that foam less and melt easily. Since a rigorous formulation of the complex region at the cold cap bottom has not been developed yet, the boundary layer approach was adopted to obtain a semiempirical relationship between the melting rate and experimentally accessible feed properties.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1472198
Alternate ID(s):
OSTI ID: 1506686
Journal Information:
International Journal of Applied Glass Science, Journal Name: International Journal of Applied Glass Science Journal Issue: 2 Vol. 10; ISSN 2041-1286
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

References (13)

Effects of heating rate, quartz particle size, viscosity, and form of glass additives on high‐level waste melter feed volume expansion journal October 2016
Mathematical modeling of cold cap journal October 2012
Effect of melter feed foaming on heat flux to the cold cap journal December 2017
Effect of furnace atmosphere on E-glass foaming journal December 2006
100% Oxygen-Fuel Combustion for Glass Furnaces book January 1991
Nuclear waste vitrification efficiency: Cold cap reactions journal December 2012
Nuclear Waste Glasses book May 2005
Model for the conversion of nuclear waste melter feed to glass journal February 2014
Glass Science in the United States: Current Status and Future Directions journal January 2014
The effects of melting reactions on laboratory-scale waste vitrification journal August 1995
Conversion of batch to molten glass, I: Volume expansion journal February 2011
Advances in JHCM HLW Vitrification Technology at VSL through Scaled Melter Testing book January 2013
Control of Radioactive Waste Glass Melters: II, Residence Time and Melt Rate Limitations journal October 1990

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