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放射性废树脂等离子体气化熔融过程中Cs分布的热力学研究

Thermodynamic calculation of Cs distribution in the plasma gasification melting process of radioactive waste resin

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【作者】 曹伦秀晁楠矫彩山李耀睿张萌

【Author】 CAO Lun-xiu;CHAO Nan;JIAO Cai-shan;LI Yao-rui;ZHANG Meng;School of Nuclear Science and Technology,Harbin Engineering University;

【机构】 哈尔滨工程大学核科学与技术学院

【摘要】 通过热力学平衡计算方法,揭示了放射性废树脂等离子体气化熔融过程中Cs的迁移规律。利用HSC计算了Cs—C—O、Cs—S—O、Cs—N—O3种体系中稳定相的组成及其高温下稳定相中Cs的释放行为,同时研究了放射性废树脂在100~1800℃下等离子体气化熔融处理过程中的Cs的平衡分布。计算结果表明,在1000℃空气气氛下,Cs2CO3、Cs2SO4、Cs2O被确定为每个系统的稳定相。在高温下Cs2SO4是最稳定的相,而Cs2CO3会部分分解,CsNO3会完全分解。在废树脂等离子体气化熔融过程中,39.62%的Cs以Cs (g)、CsOH(g)和Cs2SO4 (g)的形式释放到气相中,剩余63.08%的Cs以硅铝酸盐的形式被固化在玻璃体中。并通过与部分文献结果对比,证明了热力学计算的准确性。本研究为实际放射性废树脂等离子体气化熔融处理项目中减少Cs元素的排放和尾气吸收装置的设计提供指导。

【Abstract】 The migration law of Cs during plasma gasification and melting of radioactive waste resin was revealed by thermodynamic equilibrium calculation method.The composition of stable phases in Cs—C—O,Cs—S—O and Cs—N—O systems and the release behavior of Cs in the stable phase at high temperature were calculated by HSC.The equilibrium distribution of Cs in the plasma gasification and melting process of radioactive waste resin at 100~1800℃ was studied.The results show that Cs2 CO3,Cs2 SO4 and Cs2 O are identified as the stable phases of each system at 1000℃ in air atmosphere.Cs2 SO4 is the most stable phase at high temperature,while Cs2 CO3 will be partially decomposed and CsNO3 will be completely decomposed.In the process of waste resin plasma gasification and melting,39.62 % of Cs was released into the gas phase in the form of Cs(g),CsOH(g) and Cs2 SO4(g),and the remaining 63.08 % of Cs was solidified in the vitreous body in the form of aluminosilicate.By comparing with some literature results,the accuracy of thermodynamic equilibrium calculation is proved.This research provides guidance for reducing the emission of Cs elements and the design of exhaust gas absorption device in the actual radioactive waste resin plasma gasification melting treatment project.

【基金】 中国辐射防护研究院平台开放基金(CIRP-CNNCRPTKLJJ003);黑龙江省自然科学基金(LH2022E037);国家自然科学基金(12205065)
  • 【会议录名称】 中国核科学技术进展报告(第八卷)中国核学会2023年学术年会论文集 核化工 辐射防护
  • 【会议名称】中国核学会2023年学术年会
  • 【会议时间】2023-10-17
  • 【会议地点】中国陕西西安
  • 【分类号】TL941
  • 【主办单位】中国核学会
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