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球床堆采用球形燃料元件,其在循环过程中存在滚动磨损以及滑动磨损并产生石墨粉尘。本文借助一种球形无线探测系统量化了角速度及累计旋转角度,并量化了滚动磨损对石墨粉尘产生的影响。实验结果表明,累计旋转角度和角速度与初始径向位置有关,随着初始径向位置由里向外,呈V字型分布,与仓筒边壁接触的球累计旋转角度和角速度远大于其他位置,边壁滚动效应显著。计算结果表明,滚动磨损对石墨粉尘产生量的贡献在11%-27%,且靠近仓筒边壁处该百分比高于其他位置,边壁效应明显。一般情况下,滚动磨损产生石墨粉尘量要低于滑动磨损产生的石墨粉尘量,以往在估算球床堆中的石墨粉尘量时,只考虑滑动磨损而忽略滚动磨损,会导致石墨粉尘的估算偏高。
Ball bed stacks utilize spherical fuel elements that have rolling wear and sliding wear and produce graphite dust during cycling. In this paper, a spherical wireless detection system to quantify the angular velocity and cumulative rotation angle, and quantify the impact of rolling wear on graphite dust. The experimental results show that the cumulative rotation angle and angular velocity are related to the initial radial position. As the initial radial position is V-shaped distribution from the inside to the outside, the cumulative rotation angle and angular velocity of the ball in contact with the silo sidewall are much larger than other positions , The rolling effect of the wall significantly. The calculation results show that the rolling wear contributes 11% -27% to the amount of graphite dust generated, and the percentage of wall near the silo is higher than other positions, and the sidewall effect is obvious. In general, the amount of graphite dust generated by rolling wear is less than the amount of graphite dust generated by sliding wear. In the past, when estimating the amount of graphite dust in a bed of heap, only sliding wear was neglected and rolling wear was neglected, which would lead to estimation of graphite dust high.