Effect of feed composition on the production of off-gases during vitrification of simulated low-activity nuclear waste

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00577176" target="_blank" >RIV/67985891:_____/23:00577176 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22310/23:43928261

Result on the web

<a href="https://doi.org/10.1016/j.pnucene.2023.104932" target="_blank" >https://doi.org/10.1016/j.pnucene.2023.104932</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pnucene.2023.104932" target="_blank" >10.1016/j.pnucene.2023.104932</a>

Result language

angličtina

Original language name

Effect of feed composition on the production of off-gases during vitrification of simulated low-activity nuclear waste

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20504 - Ceramics

Project

<a href="/en/project/LUAUS23062" target="_blank" >LUAUS23062: Experimental and mathematical analysis of primary glass-forming melt properties, gas evolution, and their relation with primary foam production.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Progress in Nuclear Energy

ISSN

0149-1970

e-ISSN

1878-4224

Volume of the periodical

166

Issue of the periodical within the volume

DEC

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

104932

UT code for WoS article

001102932100001

EID of the result in the Scopus database

2-s2.0-85174437648