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Effect of feed composition on the production of off-gases during vitrification of simulated low-activity nuclear waste
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SYSNO ASEP 0577176 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of feed composition on the production of off-gases during vitrification of simulated low-activity nuclear waste Author(s) Kunc, J. (CZ)
Kloužek, Jaroslav (USMH-B) RID, ORCID, SAI
Vernerová, Miroslava (USMH-B) RID, ORCID
Cincibusová, Petra (USMH-B) RID, ORCID
Ferkl, P. (US)
Hall, M.A. (US)
Eaton, W.C. (US)
Hrma, P. (US)
Guillen, D.P. (US)
Kruger, A.A. (US)
Pokorný, Richard (USMH-B) ORCIDArticle number 104932 Source Title Progress in Nuclear Energy. - : Elsevier - ISSN 0149-1970
Roč. 166, DEC (2023)Number of pages 8 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Glass melting ; Hazardous emissions ; Modeling ; Nuclear waste ; Waste vitrification OECD category Ceramics Method of publishing Limited access Institutional support USMH-B - RVO:67985891 UT WOS 001102932100001 EID SCOPUS 85174437648 DOI 10.1016/j.pnucene.2023.104932 Annotation During the vitrification of nuclear waste, hazardous and radioactive emissions are generated from the feed-to-glass conversion reactions, in addition to discharges from forced air bubbling and air inleakage. Although the major gaseous emissions are water vapor, nitrogen, and carbon dioxide, various monitored environmental pollutants are also released, such as nitrogen oxides or sulfur dioxide. In addition, reactions between organics and nitrates in the feed may also form products of incomplete combustion such as carbon monoxide and acetonitrile. Although off-gas emissions are commonly measured during both laboratory- and pilot-scale melter testing, no predictive tool is currently available to a priori estimate the composition of gaseous emissions during nuclear waste vitrification. This work forms a basis for the development of such predictive tool by measuring gas evolution from a broad range of simulated low-activity waste melter feeds using evolved gas analysis data and developing correlations between the feed and off-gas compositions. Using reaction stoichiometry and regression analysis, we demonstrate that next to the content of nitrogen and organic carbon in the feed, the gaseous emissions are affected by the feed reduction-oxidation conditions – the more the feed is reduced, the less nitrogen monoxide, and more carbon monoxide and acetonitrile evolves. The results presented in this work provide a first step towards reducing the amount of expensive physical melter testing and the regression analysis provides a simple tool for rapid optimization of feed composition with respect to off-gas composition. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2024 Electronic address https://doi.org/10.1016/j.pnucene.2023.104932
Number of the records: 1