Heat Transfer from Glass Melt to Cold Cap: Effect of Heating Rate
The feed-to-glass conversion occurs in the cold cap floating on the melt pool in the nuclear waste glass melter. The conversion rate (the melting rate, or the glass production rate) is controlled by the heat flux delivered to the cold cap from molten glass. In an attempt to analyze the intricate relationship between rate of heating, the feed foaming response, and the rate of melting, we experimentally investigated the change in feed volume at different heating rates by using several melter feeds known to exhibit a wide range of melting rates under identical melter operating conditions. As expected, the maximum foam porosity increased as the heating rate increased but, surprisingly, the temperature at which foam reached maximum volume either decreased or increased with the heating rate depending on the feed. The cold cap bottom temperature, a critical factor for the heat flow to the cold cap, and thus the rate of melting, is hypothesized to be roughly equal to the maximum foam temperature measured by the feed volume expansion test.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1544784
- Report Number(s):
- PNNL-SA-133203
- Journal Information:
- International Journal of Applied Glass Science, Vol. 10, Issue 3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Heat transfer from glass melt to cold cap: Melting rate correlation equation
Viscosity of glass‐forming melt at the bottom of high‐level waste melter‐feed cold caps: Effects of temperature and incorporation of solid components