Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Freezing and Melting Phenomena of Urea-water Solution for Diesel Vehicle SCR System

디젤차량 SCR 시스템용 요소수용액의 동결과 해동 현상

  • 최병철 (전남대학교 기계시스템공학과) ;
  • 서충길 (전남대학교 대학원 기계공학과) ;
  • 명광재 (조선이공대학 자동차과)
  • Published : 2009.08.30
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Abstract

Urea-SCR system, the selective catalytic reduction using urea as reducing agent, is a powerful technique to reduce nitrogen oxides(NOx) emitted from diesel engines. However, a tank of urea(32.5 wt%)-water solution can be frozen in low ambient temperature levels of below $-11^{\circ}C$. The purpose of this study is to understand freezing and melting phenomena of the urea-water solution, and its can be applied to get the urea-water solution from frozen it within 5 minutes after cold start. Factors considered were the type of heater and the urea tank shape. From the results, it was found that melting volume of cartridge heater B during 5 minutes of heating period was 83ml when supplying electric power of 150W. Horizontal heater B, which was put in the narrow bottom space of the tank T1, had fast melting characteristics.

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References

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