2026年“核理安邦”联合博士生学术论坛

PF3含量对取料器附近Ni(PF3)4热分解影响的数值模拟研究

Not scheduled

1h

地址：清华大学校内

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Speaker

Mr 俊禄 吴 (清华大学)

摘要

气体离心机正常运转时，超高声速气流会在取料器口部形成一道强激波，伴随着高温。这种高温会导致部分热稳定性较差的工质发生热分解，影响机器正常运转，甚至堵塞取料器。为了解决工质在取料器口部的热分解问题，本文提出了一种在离心机中混入辅助气体的方法。本文使用等径圆管的取料器模型、以四(三氟膦)镍（Ni(PF3 )4）为工质进行了流固热耦合模拟验证。计算结果表明：随着辅助气体PF3的比例增加，取料流量增大，流体最高温度降低，相对分解速率也明显降低，但是混入过多PF3会使取料器的水力学状态发生改变。因此，应综合考虑取料器的水力学状态和工质热分解程度，严格控制辅助气体的体积分数，能一定程度上缓解取料器口部的工质热分解问题。

Abstract

In order to solve the problem of thermal decomposition of part of the processing gas at the mouth of the scoop, a method of mixing the gas of the decomposition product of the processing gas into the centrifuge is proposed. By mixing the decomposition product gas, the Mach number of the gas stream can be reduced, the temperature can be lowered, and the thermal decomposition rate can be reduced. In this paper, the axisymmetric equal-diameter scoop model is used to simulate and verify the separation of tetra(trifluorophosphine)nickel (Ni(PF3)4). By mixing PF3 with different volume fractions in Ni(PF3)4, the following results are obtained: with the increase of mixed PF3 volume fraction, the reclaiming flow rate increases, the maximum temperature of the fluid gradually decreases, and the relative decomposition rate also decreases significantly, but when the volume fraction reaches 50%, the hydraulic state of the scoop also changes. Therefore, the hydraulic state of the scoop and the degree of thermal decomposition of the working substance should be comprehensively considered, and the volume fraction of the auxiliary gas should be strictly controlled, which can alleviate the problem of thermal decomposition of the working substance at the mouth of the scoop to a certain extent.