Počet záznamů: 1
Effect of cold cap coverage and emissivity on the plenum temperature in a pilot-scale waste vitrification melter
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SYSNO ASEP 0534155 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Effect of cold cap coverage and emissivity on the plenum temperature in a pilot-scale waste vitrification melter Tvůrce(i) Abboud, A.W. (US)
Guillen, D.P. (US)
Pokorný, Richard (USMH-B) ORCIDZdroj.dok. International Journal of Applied Glass Science. - : Wiley - ISSN 2041-1286
Roč. 11, č. 2 (2020), s. 357-368Poč.str. 12 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova computational fluid dynamics ; heat transfer ; melter ; plenum ; vitrification ; waste glass Vědní obor RIV JH - Keramika, žáruvzdorné materiály a skla Obor OECD Ceramics Způsob publikování Omezený přístup Institucionální podpora USMH-B - RVO:67985891 UT WOS 000513171500001 EID SCOPUS 85079732603 DOI 10.1111/ijag.15031 Anotace Integrated computational fluid dynamics (CFD) models are being developed to model the complex physics occurring within the high-level waste melter for vitrification of legacy tank waste at the Hanford site. This study presents a validation of the integrated CFD model by using data from two experimental runs in a pilot-scale melter. While the model uses several simplifying assumptions (such as constant heat sinks from a cooling jacket and inleakage of ambient air, steady state feed-to-batch conversion heat, and a cold cap model with a simplified shape), it closely predicts the molten glass (1150 degrees C and 1175 degrees C) and plenum temperatures (550 degrees C) obtained from thermocouples during two pilot-scale tests, with an average cold cap coverage of 80%. Additional simulations were performed to explore the sensitivity of the predicted plenum temperatures to variations in cold cap coverage (fraction of melt surface covered by the glass batch) and batch emissivity. The plenum temperature was found to be in the range of 606 degrees C when cold cap coverage decreased from 95% to 70%. Cold cap emissivity had a smaller effect, increasing the plenum temperature by as much as 179 degrees C when cold cap emissivity increased from 0.2 to 0.8. Maintaining a high cold cap coverage without overfeeding is important for a sustained melter operation with high glass throughput. This work provides a tool for achieving that goal in terms of correlating the plenum temperature with the cold cap coverage. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2021 Elektronická adresa https://ceramics-onlinelibrary-wiley-com.ezproxy.lib.cas.cz/doi/full/10.1111/ijag.15031
Počet záznamů: 1