Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Drying Characteristic of High Moisture Coal using a Flash Dryer

기류건조기를 이용한 고수분 석탄의 건조 특성

  • Kim, Sang Do (Clean Coal Center, Korea Institute of Energy Research) ;
  • Lee, Si Hyun (Clean Coal Center, Korea Institute of Energy Research) ;
  • Rhim, Young Joon (Clean Coal Center, Korea Institute of Energy Research) ;
  • Choi, Ho Kyung (Clean Coal Center, Korea Institute of Energy Research) ;
  • Lim, Jeong Hwan (Clean Coal Center, Korea Institute of Energy Research) ;
  • Chun, Dong Hyuk (Clean Coal Center, Korea Institute of Energy Research) ;
  • Yoo, Ji Ho (Clean Coal Center, Korea Institute of Energy Research)
  • 김상도 (한국에너지기술연구원 청정석탄센터) ;
  • 이시훈 (한국에너지기술연구원 청정석탄센터) ;
  • 임영준 (한국에너지기술연구원 청정석탄센터) ;
  • 최호경 (한국에너지기술연구원 청정석탄센터) ;
  • 임정환 (한국에너지기술연구원 청정석탄센터) ;
  • 전동혁 (한국에너지기술연구원 청정석탄센터) ;
  • 유지호 (한국에너지기술연구원 청정석탄센터)
  • Received : 2011.04.18
  • Accepted : 2011.05.11
  • Published : 2012.02.01
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Abstract

Drying characteristic of high moisture coal using a 5 kg/hr bench scale flash dryer was investigated. Moisture content and heating value of raw coal as received basis were 29.74 wt% and 4,270 kcal/kg, respectively. Gas inlet temperature and gas inlet flow rate were $400{\sim}600^{\circ}C$ and 10~20 m/sec, respectively. The raw coal was ground and classified to the particle size range of $100{\sim}2,000{\mu}m$. The moisture removal rate of raw coal was dramatically increased with increasing gas inlet temperature and decreasing gas inlet flow rate. The heating value of dried coal was increased to 5,100~5,900 kcal/kg. To examine the chemical change on the surface of high moisture coal during flash drying process, FT-IR spectral analysis was carried out. As a result, major changes in hydroxyl, carboxyl and carbonyl peak was confirmed.

5 kg/hr 벤치규모 기류건조기를 이용한 고수분 석탄의 건조 특성을 알아보았다. 도착시료 기준으로 원료 석탄의 수분 함량 및 발열량은 각각 29.74 wt%, 4,270 kcal/kg이다. 가스유입온도 및 가스유입속도는 각각 $400{\sim}600^{\circ}C$ 및 10~20 m/sec이다. 원료 석탄의 입자크기는 $100{\sim}2,000{\mu}m$로 분쇄 및 분급하였다. 원료석탄의 수분제거율은 가스유입온도는 증가하고 가스유입속도는 감소할수록 급격하게 증가하였다. 건조석탄의 발열량은 5,100~5,900 kcal/kg으로 증가하였다. 기류건조를 통한 고수분 석탄 표면에서의 발생하는 화학적인 변화를 알아보기 위하여 FT-IR 스펙트럼 분석을 실시하였다. 그 결과 하이드록실, 카르복실 및 카보닐 피크에서 주요한 변화가 일어나는 것을 확인할 수 있었다.

Keywords

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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