降低UO_2氢氟化尾气HF浓度的新工艺  

THE NEW PROCESS OF DECREASING HYDROGEN FLUORIDE REMAINING IN THE EXHAUST GAS TO THE HYDROFLUORINATION OF URANIUM DIOXIDE

作　　者：赵珺[1] 赵思源[1] 沈国宏[1] 尚臣[1] 康仕芳[1] 丛培君 辛振林[1] 葛庆仁[1] 许贺卿[1] 

机构地区：[1]天津大学

出　　处：《核科学与工程》1990年第3期222-231,6,共10页Nuclear Science and Engineering

摘　　要：本文以一步法脱硝-还原UO_2氢氟化动力学数据为依据,结合反应器流动特性进行反应条件最佳化处理,提出了搅拌床(尾气段)—流化床(成品段)串接流程新工艺,并对搅拌床的操作工况进行了优化设计和实验研究。搅拌床热态模拟实验表明,UO_2的出口转化率可达47—50％,尾气HF浓度<5％,与流化床双床串接流程相比,其出口转化率与一级流化床基本相同,而尾气HF浓度获得了大幅度下降,达到了当前国际先进水平,因此不失为一种新颖而先进的工艺流程。In the paper, an optimum treatment of the reaction conditions is achieved based on the kinetics data of the hydrofluorination of uranium dioxide (material obtained from uranyl nitrate by one step denitration—reduction process) and the flow characteristic of the reactor. A new process of the stirred bed (exhaust gas section) in series with the fluidized bed (production section) is proposed. An optimal design and an experimental study of operating conditions of the stirred bed reactor are reported. The result of hot modeling test of the stirred bed reactor shows that the conversion of UO_2 to UF_4 in the exit stream is 47—50% and the hydrogen fluoride remaining in the exhaust gas is less than 5%. In comparison with the circuit of two fluidized 'beds in series, it shows that the conversion of the stirred bed is about equat to that of the first fluidized bed and the hydrogen fluoride remaining in the exhauast gas is decieased significantly.

关 键 词：核 燃料 UE4 UO2氢氟化 制取 

分 类 号：TL241.2[核科学技术—核燃料循环与材料]