Foaming during nuclear waste melter feeds conversion to glass: Application of evolved gas analysis

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43917162" target="_blank" >RIV/60461373:22310/18:43917162 - isvavai.cz</a>
Alternative codes found
RIV/67985891:_____/18:00497147
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/full/10.1111/ijag.12353" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1111/ijag.12353</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/ijag.12353" target="_blank" >10.1111/ijag.12353</a>

Result language
angličtina
Original language name
Foaming during nuclear waste melter feeds conversion to glass: Application of evolved gas analysis
Original language description
During the final stages of batch-to-glass conversion in a waste-glass melter, gases evolving in the cold cap produce primary foam, the formation and collapse of which control the glass production rate via its effect on heat transfer to the reacting batch. We performed quantitative evolved gas analysis (EGA) for several HLW melter feeds with temperatures ranging from 100 to 1150°C, the whole temperature span in a cold cap. EGA results were supplemented with visual observation of batch-to-glass transition using the feed expansion tests. Upon heating, most of the gases mainly H2O, CO2, NO, NO2, N-2, and O(2)evolve at temperatures below 700°C and escape directly to the atmosphere through open porosity. However, as open porosity closes when enough glass-forming melt appears at 720°C, the residual gas evolution leads to the formation of primary foam. We found that primary foaming is mostly caused by the decomposition of residual carbonates, though oxygen evolution from iron-redox reaction can also play a role. We also show that the gas evolution shifts to a higher temperature when the heating rate increases. The implications for the mathematical modeling of foam layer in the cold cap are presented.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20504 - Ceramics

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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