【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。更多还原

【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.更多还原