The distribution of activation energy and frequency factor for coal pyrolysis and char-air reaction

열분해 및 촤 - 공기 반응시의 활성화 에너지 및 빈도계수 분포

  • Park, Ho-Young (Advanced Power generation & Combustion Group, Korea Electric Power Research Institute, KEPCO) ;
  • Kim, Young-Joo (Advanced Power generation & Combustion Group, Korea Electric Power Research Institute, KEPCO)
  • 박호영 (한전 전력연구원 신발전연소그룹) ;
  • 김영주 (한전 전력연구원 신발전연소그룹)
  • Published : 2009.02.28

Abstract

The experimental work has been carried out for the study of pyrolysis and char-air reaction of five coals used in Y power station in Korea. For five coals, the characteristics of pyrolyis and char reaction have been investigated with TGA, and their kinetic parameters were obtained and compared each other. The order of pyrolysis rate for five coals were as follows : Peabody, Flame, MIP, Indominco, Elk valley. The behavior of char - air reaction for five coal chars have been successfully described by the grain model. The rate of char-air reaction gave the maximum value for Flame coal char, on the while Elk valley coal char had the minimum value. For the reaction temperature over 1,000K, Flame coal char - air reaction was very fast compared with other coal chars.

국내 Y 화력발전소에서 사용중인 5개 석탄에 대한 열분해, 촤 - 공기 반응에 대한 반응성 실험을 TGA를 이용하여 수행하였다. 탄종별 열분해 및 촤 반응특성을 살펴보았으며 반응성 지수를 구하여 서로 비교, 분석하였다. 열분해 속도는 Peabody, Flame, MIP, Indominco, Elk valley의 순이었으며 열분해 거동은 2단계, 1차 열분해 모델에 의하여 잘 모사되어졌다. 5개 탄종에 대한 촤 - 공기 반응은 그레인 모델로 잘 모사되었으며 촤의 반응 속도는 Flame 촤가 가장 컸으며 Elk valley 촤가 가장 작은 값을 보여주었다. Flame 촤의 경우 1,000 K 이상의 온도 영역에서 반응속도가 다른 촤에 비해 월등히 빠른 것을 보여주었다.

Keywords

References

  1. 국가에너지위원회. '제 1차 국가에너지기본계획', 2008
  2. International Energy Agency. "World Energy Outlook 2004", 2004
  3. 한국재경신문. "그린에너지 9개 분야 5년간 3조 투자한다", 2008
  4. Smoot, D. Fundamentals of coal combustion, Elsevier, 1993
  5. Molina, A.; Mondragon, F. "Reactivity of coal gasification with steam and $CO_2$", Fuel, 1998, 77, 1831-39 https://doi.org/10.1016/S0016-2361(98)00123-9
  6. Miura, K.; Hashimoto, K.; Siveston, P. "Factors affecting the reactivity of coal chars during gasification, and indices representing reactivity", Fuel, 1989, 68, 1461-75 https://doi.org/10.1016/0016-2361(89)90046-X
  7. Haykiri-Acma, H.; Ersoy-Mericboyu, A.; Kucukbayrak, S. "Combustion reactivity of different rank coals", Energy conversion and management, 2002, 43, 459-65 https://doi.org/10.1016/S0196-8904(01)00035-8
  8. Krevelen, V. Coal: Typology, chemistry, physics and constitution, Elsevier, 1981
  9. Szekely, J.; Evans, J. H.; Sohn, H. Y. Gas solid reactions, Academic press, 1976