DEM simulation of overcoating particles in the planetary-overcoater for optimizing the structure of key components and processing parameters

分类： 物理学 >> 核物理学 提交时间： 2024-12-03

Zeng, Miss Ning Lu, Prof. Zhenming Gao, Mr. Ming Lu, Mr. Anyuan Du, Mr. Ben Wang, Liming Yan, Prof. Xin-lin Liu, Dr. Bing

摘要： The coating layer of the TRISO (Tri-structural iso-tropic) coated particles is the first barrier to ensure the safety of high-temperature gas-cooled reactors (HTRs). The overcoating layer wrapped around the surface of the coated particles can directly and effectively reduce the damage of the coating layer during the element production process. To optimize the key component structure of a latest developed planetary-overcoater and the process, the Discrete Element Method (DEM) was used to investigate the motion of overcoating particles in the pot of planetary-overcoater. The changes in particle motion state were studied and analyzed by setting different angle values of the transition-arc-radius of the planetary-disk edge, the roughness of planetary-disk, the rotational speed of planetary-disk and the angle of the deflector, which demonstrates that these factors directly affect the trajectory and movement state of the overcoating particles, thus improving the efficiency and quality of the overcoating process by adjusting parameters. The experimental results using the optimized simulated parameters showed that the overcoated particles have a yield of up to 95% and the particle size distribution is uniform, which is in line with the expected production standards of >90%.

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