Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Development of an Urea Sensor using Electric Conductivity Method

전기전도도법을 이용한 우레아 농도 센서 개발

  • 최병철 (전남대학교 기계시스템공학부) ;
  • 김계연 (전남대학교 기계공학과) ;
  • 양주영 (전남대학교 기계공학과) ;
  • 김화남 (전남대학교 BK21지능형기계시스템사업단)
  • Received : 2010.09.30
  • Accepted : 2011.02.26
  • Published : 2011.04.30
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Abstract

The popularity of diesel engines is derived primarily from their higher thermal efficiency resulting from higher compression ratio. NOx removal from the diesel emissions is very important to meet stringent emission regulations. NOx emission from diesel engines is removed by an urea-SCR or an LNT system. The urea-SCR system needs the urea-solution supply system with concentration and level sensor. This study was carried out to develop a sensor for the measurement of urea-solution concentration by an electric conductivity method. Considering experimental parameters were the material of electrode, two kinds of electric power(AC or DC), the distance between two electrodes, and the length of electrode. It was found that the AC electric power was more useful to measure the urea-solution concentration compared to DC, because it prevented an ionization of the urea-solution. The silver rod coated with Pt is the most useful electrode, tendency of which is similar to Pt rod, and the cost is more economic. We could also find out the optimum distance between two electrodes and the length of electrode was 10mm and 3mm, respectively.

Keywords

References

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