采用修正的似化学模型和非对称的插值方法对先进反应堆中使用的三元氟化盐LiF-NaF-BeF2体系的活度系数和混合焓进行了计算,并与修正的McGlashan-Rastogi模型和Harris-Prausnitz模型的计算结果进行了比较.修正的似化学模型计算得到的BeF2活度系数与实验值的相对偏差绝对平均值为10.7％,好于另外两个模型.三元系活度系数和混合焓的计算结果与边界上的二元系计算结果有较好的连贯性,而且计算值与二元系和三元系的实验数据都吻合较好,表明两种热力学性质是热力学自洽一致的.本文详细计算了LiF-NaF-BeF2体系在925～1325 K温度区间内的活度系数,当温度升高时,BeF2活度系数最大值不断减小,对应的BeF2的含量随之增大.
Activity coefficient and mixing enthalpy of the ternary molten fluoride-salt system LiF-NaF-BeF2 applied to the advanced nuclear reactor is calculated by using the modified quasichemical model based on a proposed asymmetric interpolation method,and the comparison with the results calculated by modified McGlashan-Rastogi model and Harris-Prausnitz model has been carried out.The absolute average relative deviation of BeF2 activity coefficients calculated by using the modified quasichemical model is 10.7％,which is smaller than the other two models.The calculated activity coefficient and mixing enthalpy of ternary system on the boundary and binary system has good consistency,it shows that two kinds of thermodynamic properties are self-consistent.The BeF2 activity coefficients in the high-temperature fluoride-salt solution LiF-NaF-BeF2 are calculated at temperatures ranging from 925 K to 1325 K.It can be seen that the maximum of the BeF2 activity coefficient decreases and the corresponding BeF2 mole fraction increases with a rise in temperature.
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