核燃料颗粒涂铌沉积室内流态化与CVD反应的耦合数值模拟研究
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- 英文论文题名：Coupled numerical simulation of nuclear fuel particles fluidization and CVD reaction in deposition chamber for niobium coating
- 论文作者：李统业 ; 陈建华 ; 杨静 ; 刘廷伟
- 英文论文作者：LI Tong-ye ; CHEN Jian-hua ; YANG Jing ; LIU Ting-wei ; Nuclear Power Institute of China ; Institute of Process Engineering ; Chinese Academy of Sciences
- 年：2015
- 作者机构：中国核动力研究设计院第四研究所;中国科学院过程工程研究所;
- 论文关键词：核燃料 ; 颗粒涂铌 ; 气固两相流 ; CFD ; CVD
- 英文论文关键词：nuclear fuel ; particles coating with niobium ; gas-solid two phase flow ; CFD ; CVD
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第5册（核材料分卷、辐射防护分卷）
- 语种：中文
- 分类号：TL352
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：6
- 文件大小：482k
- 原文格式：O
- 会议级别：全国
摘要
UO_2燃料颗粒涂铌是利用流化床-化学气相沉积技术(FB-CVD)实现的,涂铌过程中燃料颗粒的黏结现象是涂铌工艺的关键技术问题,燃料颗粒的黏结现象被认为是还原反应产生的低价氯化铌的熔化引起的。本文首先利用Euler-Euler方法对沉积室内的气固两相流场进行了计算流体力学(CFD)模拟计算,然后利用HSC对还原反应产物进行了稳态模拟计算,并将还原反应的计算结果与流场分布、实验结果相结合,拟合得到氯化铌与氢气的还原反应动力学参数,最后将流场与反应耦合计算,得到了沉积室内的速度场和组分浓度场。结果表明,沉积室内燃料颗粒的分布及还原反应是不均匀的,在沉积室内锥筒存在局部颗粒堆积现象,该区域低价氯化铌含量较高,燃料颗粒最容易在此处发生黏结,这与实验过程中观察的现象是一致的。本文的研究结果为解决涂铌过程中燃料颗粒的黏结问题提供了方向。
The fluidized bed-chemical vapor deposition(FB-CVD) process is used for UO_2 fuel particles coating with niobium.Undesirable bonding phenomenon is one of the key technical problems in niobium coating process.It is attributed to melting of low valence products of niobium chloride reduction.In present paper,firstly we studied the gas-solid flow field numerically in the deposition chamber by Euler-Euler method.Then the steady-state reduction reaction products were simulated by HSC,which was combined with the flow field distribution,as well as the experimental results to fitting the kinetic parameters for niobium chloride and hydrogen reaction system.Finally coupled flow-reaction simulation was performed and the velocity and component concentration fields in the deposition chamber were obtained.The results showed that both the flow and reaction products concentration fields in the deposition chamber were non-uniform.Local particle packing phenomenon in deposition chamber cone section was found,and the low valence products were concentrated in this region.Thus the particle bonding most likely occurs in the same region,which was consistent with the experiment observation.This work provides an opportunity to solve particle bonding problem in the niobium coating process.
The fluidized bed-chemical vapor deposition(FB-CVD) process is used for UO_2 fuel particles coating with niobium.Undesirable bonding phenomenon is one of the key technical problems in niobium coating process.It is attributed to melting of low valence products of niobium chloride reduction.In present paper,firstly we studied the gas-solid flow field numerically in the deposition chamber by Euler-Euler method.Then the steady-state reduction reaction products were simulated by HSC,which was combined with the flow field distribution,as well as the experimental results to fitting the kinetic parameters for niobium chloride and hydrogen reaction system.Finally coupled flow-reaction simulation was performed and the velocity and component concentration fields in the deposition chamber were obtained.The results showed that both the flow and reaction products concentration fields in the deposition chamber were non-uniform.Local particle packing phenomenon in deposition chamber cone section was found,and the low valence products were concentrated in this region.Thus the particle bonding most likely occurs in the same region,which was consistent with the experiment observation.This work provides an opportunity to solve particle bonding problem in the niobium coating process.
引文
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[6]曹战民,等.NbCl_5氢还原制备金属铌粉的热力学分析[J].北京科技大学学报,2008,30(6),40-643.
[2]John M B J,et al.Fluidized-bed coating of UO_2 powder with niobium and other elements.UC-25 Metallurgy and Ceramics(TID-4500,15th Ed.):Report No.BMI-1440,1960.
[3]刘光启,等.化工物性算图手册[M].北京:化学工业出版社,2002.
[4]Crowe C.Multiphase Flow Handbook.CRC Press 2005.
[5]Wachem B V.Derivation,Implementation and Validation of Computer Simulation Models for Gas-Solid Fluidized Beds,2000.
[6]曹战民,等.NbCl_5氢还原制备金属铌粉的热力学分析[J].北京科技大学学报,2008,30(6),40-643.