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Application of pyrolysis to remove hydrogen from an organic nuclear waste

Duan, Zhiya and Fiquet, Olivier and Ablitzer, Carine and Cassayre, Laurent and Vergnes, Hugues and Floquet, Pascal and Joulia, Xavier Application of pyrolysis to remove hydrogen from an organic nuclear waste. (2021) Journal of Hazardous Materials, 401. 123367. ISSN 0304-3894

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Official URL: https://doi.org/10.1016/j.jhazmat.2020.123367

Abstract

The work deals with the removal by slow pyrolysis of epoxy resin from samples of spent nuclear fuel embedded in this polymer. Beyond the nuclear field, epoxy resin removal by pyrolysis is a typical issue for the recovery of metals in electronic waste. The main objective is to find the optimal conditions to remove hydrogen in the residual solid waste, in order to avoid hydrogen production by radiolysis during storage and so to prevent any risk of overpressure and explosion. The condensable pyrolysis products (tar-water mixture) and the char were characterised and quantified by elemental analyses, while the permanent gases were quantified by gas chromatography. A data reconciliation method was applied to adjust the values of raw measurements in order to complete the mass balances for both C, H, O and N elements and pyrolysis products. After studying the impact of temperature on the pyrolysis balance, experiments on a pilot furnace were conducted at 450 °C, in the frame of a parametric study of the heating rate, argon gas flow rate, resin mass and plateau time. At fixed temperature, we show that the plateau time is the only significant parameter for minimizing the residual hydrogen content in the char.

Item Type:Article
HAL Id:hal-03106338
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Funders:
Commissariat à l’énergie atomique et aux énergies alternatives (FRANCE)
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Deposited On:11 Jan 2021 16:19

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