Heat transfer from glass melt to cold cap: Melting rate correlation equation
Abstract
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 ratemore »
- Authors:
-
- Pacific Northwest National Laboratory Richland, Washington
- 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
- U.S. Department of Energy, Office of River Protection Richland WA 99352.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1472198
- Grant/Contract Number:
- DE‐AC05‐76RL01830
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- International Journal of Applied Glass Science
- Additional Journal Information:
- Journal Name: International Journal of Applied Glass Science Journal Volume: 10 Journal Issue: 2; Journal ID: ISSN 2041-1286
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Hrma, Pavel, Pokorny, Richard, Lee, SeungMin, and Kruger, Albert A. Heat transfer from glass melt to cold cap: Melting rate correlation equation. United States: N. p., 2018.
Web. doi:10.1111/ijag.12666.
Hrma, Pavel, Pokorny, Richard, Lee, SeungMin, & Kruger, Albert A. Heat transfer from glass melt to cold cap: Melting rate correlation equation. United States. https://doi.org/10.1111/ijag.12666
Hrma, Pavel, Pokorny, Richard, Lee, SeungMin, and Kruger, Albert A. Mon .
"Heat transfer from glass melt to cold cap: Melting rate correlation equation". United States. https://doi.org/10.1111/ijag.12666.
@article{osti_1472198,
title = {Heat transfer from glass melt to cold cap: Melting rate correlation equation},
author = {Hrma, Pavel and Pokorny, Richard and Lee, SeungMin and Kruger, Albert A.},
abstractNote = {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.},
doi = {10.1111/ijag.12666},
journal = {International Journal of Applied Glass Science},
number = 2,
volume = 10,
place = {United States},
year = {2018},
month = {9}
}
https://doi.org/10.1111/ijag.12666
Web of Science
Works referenced in this record:
Mathematical modeling of cold cap
journal, October 2012
- Pokorny, Richard; Hrma, Pavel
- Journal of Nuclear Materials, Vol. 429, Issue 1-3
Glass Science in the United States: Current Status and Future Directions
journal, January 2014
- Mauro, John C.; Philip, Charles S.; Vaughn, Daniel J.
- International Journal of Applied Glass Science, Vol. 5, Issue 1
Effect of furnace atmosphere on E-glass foaming
journal, December 2006
- Kim, Dong-Sang; Dutton, Bryan C.; Hrma, Pavel R.
- Journal of Non-Crystalline Solids, Vol. 352, Issue 50-51
Effect of melter feed foaming on heat flux to the cold cap
journal, December 2017
- Lee, SeungMin; Hrma, Pavel; Pokorny, Richard
- Journal of Nuclear Materials, Vol. 496
Effects of heating rate, quartz particle size, viscosity, and form of glass additives on high‐level waste melter feed volume expansion
journal, October 2016
- Lee, SeungMin; VanderVeer, Bradley J.; Hrma, Pavel
- Journal of the American Ceramic Society, Vol. 100, Issue 2
Model for the conversion of nuclear waste melter feed to glass
journal, February 2014
- Pokorny, Richard; Hrma, Pavel
- Journal of Nuclear Materials, Vol. 445, Issue 1-3
Control of Radioactive Waste Glass Melters: II, Residence Time and Melt Rate Limitations
journal, October 1990
- Bickford, Dennis F.; Hrma, Pavel; Bowan, Bradley W.
- Journal of the American Ceramic Society, Vol. 73, Issue 10
Nuclear waste vitrification efficiency: Cold cap reactions
journal, December 2012
- Hrma, P.; Kruger, A. A.; Pokorny, R.
- Journal of Non-Crystalline Solids, Vol. 358, Issue 24
The effects of melting reactions on laboratory-scale waste vitrification
journal, August 1995
- Smith, Peter A.; Vienna, John D.; Hrma, Pavel
- Journal of Materials Research, Vol. 10, Issue 8
Conversion of batch to molten glass, I: Volume expansion
journal, February 2011
- Henager, Samuel H.; Hrma, Pavel; Swearingen, Kevin J.
- Journal of Non-Crystalline Solids, Vol. 357, Issue 3