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球床堆采用气力输送方式实现球形燃料元件在堆芯外数十米垂直管路中的提升。通过向管路中先后加入2个燃料元件,可以实现串列提升模式,进而提高燃料元件的输送效率。在提升过程中,燃料元件之间会发生碰撞。研究燃料元件碰撞过程的动力学特征,可以为分析串列提升模式的可行性和可靠性提供重要基础。该文基于计算流体力学研究了提升管路内的流场特征,对燃料元件进行了受力分析,在此基础上建立了燃料元件提升过程的动力学模型,研究了燃料元件的动力学特征。研究结果表明:燃料元件之间的碰撞力不会导致其发生破损;经历几次碰撞后,2个燃料元件会被一起提升,提升过程稳定,提升效率较高。在有机玻璃实验平台上开展实验,实验结果验证了串列提升模式的可行性。研究结果为燃料元件气力输送提供了基础,也为球床堆设计提供了依据。
Ball bed reactor using pneumatic delivery to achieve spherical fuel components in the core tens of meters vertical pipe lifting. By adding two fuel elements successively into the pipeline, a tandem lifting mode can be realized, thereby improving the delivery efficiency of the fuel element. During the lifting process, collisions between fuel elements occur. Studying the dynamic characteristics of the collision process of fuel elements can provide an important basis for analyzing the feasibility and reliability of the tandem lifting mode. Based on the computational fluid dynamics (CFD) study, the flow fields in the riser were studied, and the force analysis of the fuel element was carried out. Based on this, the dynamic model of the fuel element lifting process was established and the kinetic characteristics of the fuel element were studied. The results show that: the collision force between the fuel elements will not cause damage; after several collisions, the two fuel elements will be together to enhance the stability of the lifting process, improve the efficiency. Experiments were carried out on the plexiglass experimental platform. The experimental results verify the feasibility of the tandem lifting mode. The results provide the basis for the pneumatic conveying of fuel elements and also provide the basis for the design of ball bed reactor.