Technology for the Preparation of Ash-free Coal from Low Rank Coal(LRC)

저등급 석탄으로부터 초청정석탄 제조 기술

  • Lee, Sihyun (Clean Coal Technology Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research) ;
  • Kim, Sangdo (Clean Coal Technology Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research)
  • 이시훈 (한국에너지기술연구원 기후변화기술연구본부 청정석탄연구센터) ;
  • 김상도 (한국에너지기술연구원 기후변화기술연구본부 청정석탄연구센터)
  • Received : 2008.01.15
  • Accepted : 2008.04.02
  • Published : 2008.06.30

Abstract

Efficient use of low rank coals (LRC) have been investigated as a method to cope with recent high oil price. Among the coals used in industry, lignite and sub-bituminous coals are belong to the LRC, and have abundant deposit and are distributed worldwide, but high moisture contents and self ignition properties inhibits their utilization. In this paper, chemical coal cleaning to produce ash-free coal from LRC has been investigated. Two technologies, that is, UCC(Ultra Clean Coal) process removing ash from coal and Hyper Coal process extracting combustibles from coal were compared with. UCC process has merits of simple and reliable when it compared with Hyper Coal process, but the remaining ash contents werehigher than Hyper Coal. Hyper Coal has ash contents under the 200ppm when raw coal is treated with appropriate solvent and ion exchange materials to remove alkali materials in extracted solution. The ash-free coal which is similar grade with oil can be used as alternate oil in the industry, and also used as a high grade fuel for IGCC, IGFC and other advanced combustion technology.

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