Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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A Study on Char Oxidation Kinetics by Direct Measurement of Coal Ignition Temperature

석탄점화온도의 직접적인 측정에 의한 촤산화 반응율 도출에 대한 연구

  • Kwon, Jong-Seo (Graduate School of Mechanical Engineering, Pusan National University) ;
  • Kim, Ryang-Gyoon (Graduate School of Mechanical Engineering, Pusan National University) ;
  • Song, Ju-Hun (School of Mechanical Engineering, Pusan National University) ;
  • Chang, Young-June (School of Mechanical Engineering, Pusan National University) ;
  • Jeon, Chung-Hwan (School of Mechanical Engineering, Pusan National University)
  • 권종서 (부산대학교 기계공학부 대학원) ;
  • 김량균 (부산대학교 기계공학부 대학원) ;
  • 송주헌 (부산대학교 기계공학부) ;
  • 장영준 (부산대학교 기계공학부) ;
  • 전충환 (부산대학교 기계공학부)
  • Received : 2011.07.18
  • Accepted : 2011.11.30
  • Published : 2011.12.31
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Abstract

The experiment was designed to study the char oxidation kinetics of pulverized coals commonly utilized in Korean power plants. The kinetics has been estimated using the Semenov's thermal spontaneous ignition theory adapted to coal char particle ignition temperature. The ignition temperature of coal char particle is obtained by a direct measurement of the particle temperature with photo detector as well as by means of a solid thermocouple which is used as both a heating and a measuring element. The ignition temperatures for subbituminous coal, Wira, and bituminous coal, Yakutugol, have been measured for 4 sizes in the range of 0.52-1.09 mm. The ignition temperature of the particle increases with the increasing diameter. The results were used to calculate the activation energy and the pre-exponential factor. As a result, the kinetic parameters are in an agreement with ones reported from other investigations.

본 연구의 목적은 한국화력발전소에서 사용되는 석탄의 촤 산화반응율을 연구하는 것이다. 석탄촤 산화반응율은 입자의 점화온도에 근거한 Semenov의 열착화이론을 활용하여 도출하였다. 석탄촤의 입자를 열전대를 통해 직접 가열 및 온도 측정을 할 수 있으며, 광각기 센서를 통해 석탄촤점화시 발생되는 빛의 강도를 계측함으로써 점화시점을 결정 할 수 있는 실험장치를 제안 하였다. 아역청탄인 Wira와 역청탄인 Yakutugol의 석탄촤 점화온도는 입자 직경의 변화에 따라 측정을했으며, 입자의 직경이 커질수록 석탄촤 점화온도는 상승하였다. 입자 직경에 따른 석탄촤 점화온도의 결과를 통해 활성화에너지 및 빈도인자를 도출하였다. 본 연구를 통해 도출한 석탄촤 산화반응율 값을 기존의 연구 데이터와 비교한 결과 유사함도 확인할 수 있었다.

Keywords

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