Uranium tetrafluoride, UF4, and thorium tetrafluoride, ThF4, can be used as fuels in molten salt reactors. For the molten salt reactor design and safety analysis, it is essential to know the thermodynamic properties o...Uranium tetrafluoride, UF4, and thorium tetrafluoride, ThF4, can be used as fuels in molten salt reactors. For the molten salt reactor design and safety analysis, it is essential to know the thermodynamic properties of the UF4 and ThF4 materials. However, the experimental data for UF4 and ThF4 P-V-T are scarce in literature. Under this circumstance prediction of the thermodynamic properties can be supported by theoretical calculations to remedy missing experimental data. Within this paper the Song, Mason and lhm＇s equation of state with modification of Tao and Mason, originally derived for spherical and molecular fluids, is applied for fluid UF4 and ThF4 based on the available experimental data. The equation of state is based on statistical mechanical perturbation theory with the perturbation scheme of Weeks, Chandler, and Andresen. The prediction of constants applied in the equation of state is based on the work of Boushehri et al. using data for heat of vaporization and liquid density at the triple point. The calculation of the heat of vaporization applies the ＂sigma＂ method reported by Darken et al. with the vapour pressure data and heat capacities of liquid and vapour of UF4 and ThF4. Finally an extra correction term for the vapour pressure is introduced into the new equation of state. The results show that this equation of state agrees reasonably well with the available experimental data. It can be expected that this equation of state can be applied also for conditions where experimental data are currently missing.展开更多
在理论计算基础上，于90 kA制氟电流条件下做了最佳投料气固比试验。理论计算结果表明，气固比优化后，立式氟化反应器正常工作时的F2过剩量为1.04％～3.39％。试验结果表明，250 kg U/h立式氟化反应器可长期稳定运行于气固比205～210 A...在理论计算基础上，于90 kA制氟电流条件下做了最佳投料气固比试验。理论计算结果表明，气固比优化后，立式氟化反应器正常工作时的F2过剩量为1.04％～3.39％。试验结果表明，250 kg U/h立式氟化反应器可长期稳定运行于气固比205～210 A· h/kg下，立式氟化反应器投料气固比控制范围由前期生产确定的200～220 A · h/kg优化为205～210 A· h/kg。投料气固比优化后，F2利用效率提高1％以上，成渣率下降20％以上。展开更多
It is well known that the reaction between UF<sub>6</sub> and SiH<sub>4</sub> cannot take place below 140℃. Recently we found in our experiments that this reaction can proceed at a high speed ...It is well known that the reaction between UF<sub>6</sub> and SiH<sub>4</sub> cannot take place below 140℃. Recently we found in our experiments that this reaction can proceed at a high speed by catalyzing with HBr at room temperature, producing UF<sub>4</sub> and other products. In this note the HBr-catalyzed reaction of UF<sub>6</sub>+SiH<sub>4</sub> and the kinetic mechanism of the catalyzed reaction are investigated. 1 Experimental UF<sub>6</sub> gas, produced by the 404th Factory of Nuclear Industry Corporation, was vacuum-distilled and cold-trapped several times at dry ice temperature （-78℃） in a metal vacu-展开更多
文摘Uranium tetrafluoride, UF4, and thorium tetrafluoride, ThF4, can be used as fuels in molten salt reactors. For the molten salt reactor design and safety analysis, it is essential to know the thermodynamic properties of the UF4 and ThF4 materials. However, the experimental data for UF4 and ThF4 P-V-T are scarce in literature. Under this circumstance prediction of the thermodynamic properties can be supported by theoretical calculations to remedy missing experimental data. Within this paper the Song, Mason and lhm＇s equation of state with modification of Tao and Mason, originally derived for spherical and molecular fluids, is applied for fluid UF4 and ThF4 based on the available experimental data. The equation of state is based on statistical mechanical perturbation theory with the perturbation scheme of Weeks, Chandler, and Andresen. The prediction of constants applied in the equation of state is based on the work of Boushehri et al. using data for heat of vaporization and liquid density at the triple point. The calculation of the heat of vaporization applies the ＂sigma＂ method reported by Darken et al. with the vapour pressure data and heat capacities of liquid and vapour of UF4 and ThF4. Finally an extra correction term for the vapour pressure is introduced into the new equation of state. The results show that this equation of state agrees reasonably well with the available experimental data. It can be expected that this equation of state can be applied also for conditions where experimental data are currently missing.
文摘It is well known that the reaction between UF<sub>6</sub> and SiH<sub>4</sub> cannot take place below 140℃. Recently we found in our experiments that this reaction can proceed at a high speed by catalyzing with HBr at room temperature, producing UF<sub>4</sub> and other products. In this note the HBr-catalyzed reaction of UF<sub>6</sub>+SiH<sub>4</sub> and the kinetic mechanism of the catalyzed reaction are investigated. 1 Experimental UF<sub>6</sub> gas, produced by the 404th Factory of Nuclear Industry Corporation, was vacuum-distilled and cold-trapped several times at dry ice temperature （-78℃） in a metal vacu-
