文章摘要
罗雨,刘希灵,马春德.破损铝电解槽阴极钢棒的冲击回波法检测[J].声学技术,2022,41(2):288~294
破损铝电解槽阴极钢棒的冲击回波法检测
Detection of cathode steel rod of aluminium electrolyzer by impact echo method
投稿时间:2021-01-31  修订日期:2021-04-01
DOI:10.16300/j.cnki.1000-3630.2022.02.021
中文关键词: 阴极钢棒  冲击回波法  数值模拟  脉冲宽度  应力峰值  破损状况
英文关键词: cathode steel rod  impact echo method  numerical simulation  pulse width  peak stress  damage condition
基金项目:
作者单位E-mail
罗雨 中南大学资源与安全工程学院, 湖南长沙 410083  
刘希灵 中南大学资源与安全工程学院, 湖南长沙 410083 lxlenglish@163.com 
马春德 中南大学高等研究中心, 湖南长沙 410083  
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中文摘要:
      电解槽的寿命及修复关系着整个电解铝行业的经济效益,是不容忽视的技术问题。为能对破损电解槽进行及时修复从而延长电解槽寿命,提出应用冲击回波法对电解槽破损状况进行评估。首先利用数值模拟方法探讨了冲击回波激振源特性对应力波脉冲宽度及应力峰值的影响,得出激振源直径D与脉冲宽度tc呈线性相关:tc=0.004D,且与应力峰值(P)呈指数相关P=2e8D1.928 8,而冲击速度v不改变脉冲宽度tc,但与应力峰值P呈线性相关:P=0.0751v-0.068 6。进而基于数值分析结果,运用冲击回波法检测破损电解槽中的阴极钢棒,通过对检测结果的时频域分析,得出了阴极钢棒的破损状况及位置,并与刨槽后真实的阴极钢棒对比。结果表明:冲击回波法能很好地实现电解槽破损部位的定位,可为电解槽寿命评估与修复提供参考。
英文摘要:
      The service life and repair costs of electrolyzer are related to the economic benefits of the entire electrolytic aluminium industry, which is a technical issues that cannot be ignored. In order to repair the damaged electrolyzer in time and prolong the service life of the electrolyzer, the impact echo method is proposed to evaluate the damaged condition of the electrolyzer. Firstly, the influence of the characteristics of impact echo excitation source on the stress wave pulse width and stress peak is discussed by numerical simulation. The results show that there are a linear correlation between the diameter of the exciting source (D) and the pulse width (tc) of stress wave (tc= 0.004D), and an exponential correlation between the diameter of the exciting source (D) and the peak stress (P) (P=2e8D1.928 8). However, the impact velocity (v) does not change the pulse width (tc), but there is a linear correlation between the impact velocity (v) and the peak stress P (P = 0.0751v-0.068 6). Then, based on the results of numerical simulation, the impact echo method is used to detect the cathode steel bar in the damaged electrolyzer. Through the time-frequency analysis of the detection results, the damage condition and position of the cathode steel bar are obtained, and the analysis results are compared with the damage condition of the real cathode steel bar after grooving. The results show that the impact echo method can be used to locate the damaged parts of the electrolyzer, which can provide a reference for the life evaluation and repair of the electrolyzer.
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