Beryllium Pebbles Preparation and Modeling of Rotating Electrode Process
Beryllium Pebbles Preparation and Modeling of Rotating Electrode Process
复制标题
铍卵石的制备和旋转电极过程的建模
DOI：
10.13182/fst12-a13383
复制
发表时间：
2012
影响因子：
0.9
通讯作者：
D. D. Thorat
中科院分区：
文献类型：
--
作者：
D. Sathiyamoorthy;T. Mohanty;K. Srinivas;D. Selvaraj;D. D. Thorat
ITER氦冷固体增殖堆实验包层模块的中子倍增需要0.2~2 mm大小的球状鹅卵石形状的高纯铍。鹅卵石应该致密，并具有严格的化学成分，以承受高温和辐射环境。因此，传统的制备铍卵石的方法必须改进为一种新的技术，如旋转电极法(REP)。本文对控制粒度的工艺参数进行了建模、设计和选择。根据代理不锈钢球状鹅卵石的制备结果，用REP法制备了铍鹅卵石，并给出了实验结果。发现影响卵石大小和产率的重要参数是阳极直径、材料常数、每分钟转数、弧隙和再生室中的冷却盖气体。鹅卵石一旦形成，就被保持在室内的悬浮状态，以获得近乎完美的球形。本文还根据规定的国际标准，从安全和工业卫生控制方面对铍卵石处理进行了重点讨论。
Abstract High-purity beryllium in the form of spherical pebbles of size ranging from 0.2 to 2 mm are required for neutron multiplication in the test blanket module of the helium-cooled solid breeder in ITER. The pebbles should be dense and have stringent chemical composition to withstand a high-temperature and irradiation environment. Hence, the conventional method of preparing beryllium pebbles has to be modified to a novel technique such as the rotating electrode process (REP). In the present paper REP modeling, design, and selection of process parameters to control the particle size have been carried out. Based on the results on the preparation of surrogate stainless steel spherical pebbles, beryllium pebbles have been prepared by REP, and the results obtained are presented. The important parameters that affect the pebble size and production rate are found to be anode diameter, material constants, revolutions per minute, arc gap, and the cooling cover gas in the REP chamber. The pebbles once formed are kept in levitated condition in the chamber for achieving near-perfect spherical shape. This paper also focuses on beryllium pebble handling with respect to safety and industrial hygiene control as per the prescribed international standard.