Abstract

The effects of temperature and pressure conditions on the equilibrium chemical compositions of purge gas at the outlet of the test blanket module (TBM) in the helium-cooled ceramic reflector (HCCR) are studied. As the chemical species in the equilibrium states, nine chemical species are considered: H, T, O, H₂, HT, T₂, H₂O, HTO, and T₂O. The mole fractions of these chemical species are calculated using a Gibbs free energy minimization method starting from the initial state of a H₂-HTO mixture. The standard Gibbs free energies for the tritium species used in the study are calculated from the molecular constants obtained by a coupled-cluster calculation. The effects of pressure variations on the equilibrium compositions are shown to be negligible. The effects of temperature variations are also insignificant when the temperature exceeds 800 K. When the initial H₂/HTO ratio is more than 10, more than 90% of tritium is expected to be recovered in the form of HT.

摘要

研究了温度和压力条件对氦冷却陶瓷反射器（HCCR）中测试橡皮布模块（TBM）出口处吹扫气体平衡化学成分的影响。如在平衡态的化学物种，九个化学物种被认为：H，T，O，H ₂，HT，T ₂，H ₂ O，HTO和T ₂ O.这些化学物种的摩尔分数是使用计算从H ₂的初始状态开始的吉布斯自由能最小化方法-HTO混合物。本研究中使用的species物种的标准吉布斯自由能是通过耦合簇计算获得的分子常数来计算的。压力变化对平衡组成的影响显示为可忽略的。当温度超过800 K时，温度变化的影响也微不足道。当初始H ₂ / HTO比大于10时，预计将以HT的形式回收90％以上的tri。