Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Influence of Surrounding Gas and Coal Characteristics on Flame Propagation in Oxy-Fuel Combustion of Pulverized Coal

미분탄 순산소 연소에서 주위 기체와 석탄 특성이 화염전파에 미치는 영향

  • 강영민 (부산대학교 대학원 기계공학부) ;
  • 심영삼 (부산대학교 기계공학부) ;
  • 문철언 (부산대학교 대학원 기계공학부) ;
  • 성연모 (부산대학교 대학원 기계공학부) ;
  • 서상일 (한전 전력연구원) ;
  • 김태형 (한전 전력연구원) ;
  • 최경민 (부산대학교 기계공학부 화력발전 에너지기술 분석센터) ;
  • 김덕줄 (부산대학교 기계공학부 기계기술연구원)
  • Published : 2009.01.01
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Abstract

Oxy-fuel combustion of pulverized coal is one of the promising new technologies to reduce $CO_2$ and NOx from coal combustion. However, the stability of pulverized coal flame is reduced in the oxy-fuel combustion. This flame stability is concerned with the flame propagation that is affected by surrounding gas and coal characteristics, such as gas temperature, gas composition, coal volatile, coal activation energy and coal size. In this paper, a study on the influence of surrounding gas and coal characteristics on the flame propagation velocity in oxy-fuel combustion of pulverized coal was preformed. One dimensional model was used to calculate the flame propagation velocity of pulverized coal clouds. In this model, the radiation is considered to be the main source of heat exchange, and Monte Carlo method was adopted for accurate calculation of radiation heat flux. It was found that the flame propagation velocity become higher with the decrease of coal activation energy and the increase of coal volatile. Also, according to the increase of gas temperature and $O_2$ concentration, flame propagation velocity increased.

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References

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