Title: 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 » and experimentally accessible feed properties.« less

Authors:

Hrma, Pavel ^[1]; Pokorny, Richard  ^[2];

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Lee, SeungMin ^[1]; Kruger, Albert A. ^[3]

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+ Show Author Affiliations

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.

Publication Date:

Mon Sep 24 00:00:00 EDT 2018

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