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Application of pyrolysis to remove hydrogen from an organic nuclear waste.
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-07-02 , DOI: 10.1016/j.jhazmat.2020.123367
Zhiya Duan 1 , Olivier Fiquet 2 , Carine Ablitzer 2 , Laurent Cassayre 3 , Hugues Vergnes 3 , Pascal Floquet 3 , Xavier Joulia 3
Affiliation  

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.



中文翻译:

应用热解从有机核废料中除去氢。

这项工作涉及通过缓慢热解从嵌入聚合物中的乏核燃料样品中除去环氧树脂的方法。除核领域外,通过热解去除环氧树脂是回收电子废物中金属的典型问题。主要目的是找到最佳的条件,以除去残留固体废物中的氢,以避免在储存过程中因放射分解而产生氢,从而防止任何超压和爆炸的危险。通过元素分析对可冷凝的热解产物(焦油-水混合物)和焦炭进行表征和定量,同时通过气相色谱法对永久性气体进行定量。为了完成C,H,O和N元素以及热解产物的质量平衡,应用了数据对账方法来调整原始测量值。在研究了温度对热解平衡的影响之后,在加热速率,氩气流速,树脂质量和稳定时间的参数研究框架内,在450°C下进行了中试炉实验。在固定温度下,我们表明平稳时间是最小化焦炭中残留氢含量的唯一重要参数。

更新日期:2020-07-10
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