摘要
针对放射性废树脂流化裂解反应过程中颗粒团聚问题,提出了高岭土和陶瓷颗粒预混进料抑制颗粒团聚的新思路,在流化裂解实验装置中通过测量床层压降和对产物的XRD、SEM以及元素分析,考察预混时高岭土添加量对流化特性和颗粒团聚的影响规律。研究结果表明,高岭土与陶瓷球预混后可在陶瓷球颗粒表面形成均匀的涂覆层,当高岭土添加量≥0.20%(质量分数)时具有显著的抑制废树脂流化裂解反应中颗粒团聚的作用,但存在一定的作用时长,应定期补加预混高岭土的陶瓷球颗粒以维持陶瓷球表面的高岭土覆层,当高岭土预混添加量为0.20%(质量分数)时高岭土预混进料抑制团聚的作用时长约为70 min。与高岭土和废树脂共混进料相比,预混进料可在更低的高岭土添加量条件下达到颗粒团聚抑制效果,有利于放射性废树脂的减量化处理。
During the fluidized pyrolysis of radioactive waste resin,a novel approach involving the pre-mixing of kaolin and ceramic particles in the feedstock to inhibit particle agglomeration was proposed,and via a fluidized pyrolysis experimental apparatus,effects of kaolin addition amounts on fluidization and particle agglomeration were investigated by measuring the bed pressure drop and analyzing the products with XRD,SEM,and elemental analysis.The results indicate that a uniform coating layer forms on surfaces of ceramic particles after pre-mixing with kaolin.Notably,when the kaolin addition is larger than 0.20%(mass),it significantly inhibits particle agglomeration in the fluidized pyrolysis of waste resin,though the effect has a specific duration.Consequently,it is necessary to periodically reload the ceramic particles pre-mixed with kaolin to maintain the kaolin coating layer on the surface of the ceramic balls.When the kaolin premix addition amount is 0.20%(mass),the kaolin premix feed inhibits agglomeration for about 70 min.Compared to the situation in which kaolin and waste resin were fed simultaneously,pre-mixing feeding can achieve the same inhibition effect on particle agglomeration with a lower addition amount of kaolin,which is beneficial for the volume reduction treatment of radioactive waste resin.
作者
黄正梁
冯铭瑞
宋琦
任聪静
杨遥
孙婧元
王靖岱
阳永荣
HUANG Zhengliang;FENG Mingrui;SONG Qi;REN Congjing;YANG Yao;SUN Jingyuan;WANG Jingdai;YANG Yongrong(Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,Hangzhou 310027,Zhejiang,China;College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China;Ningbo Innovation Center,Zhejiang University,Ningbo 315100,Zhejiang,China)
出处
《化工学报》
EI
CSCD
北大核心
2024年第9期3094-3102,共9页
CIESC Journal
基金
国家自然科学基金联合基金项目(U21B2095)。
关键词
放射性废树脂
热解
流态化
团聚
高岭土
radioactive waste resin
pyrolysis
fluidization
agglomeration
kaolin
