Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (1): 63-67.doi: 10.3969/j.issn.1000-565X.2011.01.012

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Influence of Aerobic Oxidization on Direct Measurement of Components of Liquid Steel

Yao Shun-chun Lu Ji-dong Li Jun-yan Chen Kai Pan Sheng-hua Dong Mei-rong Li Jun   

  1. South China university of technology electricity institute, guangdong guangzhou 510640
  • Received:2010-04-30 Revised:2010-07-28 Online:2011-01-25 Published:2010-12-01
  • Contact: 陆继东(1957一)，男，教授，博士生导师，主要从事煤的高效低污染利用和热力系统与设备的诊断、控制及优化运行研究 E-mail:jdlu@mail.hust.edu.cn
  • About author:姚顺春(1983一)，男，博士生，主要从事激光测量与诊断技术在燃烧领域的应用研究
  • Supported by:

    国家自然科学基金资助项目(51071069)；广东省科技计划项目(2008B010400044)

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Abstract:

An experiment system aimed to direct analyze liquid steel based on Laser-Induced Breakdown Spectroscopy has been built. A laboratory-scale induction furnace of 1 kg capacity is used to melt steel sample. The process of oxidization in the surface of liquid steel under atmospheric conditions is tested, and its influence to the results of analysis is discussed. Ar is used as inert gas to exclude the ambient air from the surface of liquid steel, and the changes of the intensity and RSD of elementals emission lines with the flow rate of Ar are detailed. The results of analysis show that the relative intensities of alloying elements line increase with the formation of oxidization in the surface of liquid steel, because the formation of oxide mixtures by most of alloying elements lead to a higher fractional concentration of these elementals on the sample surface. The result of direct analysis of liquid steel can be improved using Ar as inert gas with an appropriate flow rate.

Key words: liquid steel, direct measurement, laser-induced breakdown spectroscopy, oxidization, Ar gas