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

  • 제39권1호
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  • Pages.53-59
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  • 2015
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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바이오매스(호두껍질) 혼소에 대한 연소 특성에 관한 연구

Combustion Characteristics for Co-firing of Biomass (Walnut Shell)

  • Kim, Jin-Ho (Pusan Clean Coal Center, Dept. of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Lee, Byoung-Hwa (PLM team, Boiler R&D center, Doosan Heavy Industries & Construction, LTD.) ;
  • Sh, Lkhagvadorj (Pusan Clean Coal Center, Dept. of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Kim, Sang-In (Pusan Clean Coal Center, Dept. of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Jeon, Chung-Hwan (Pusan Clean Coal Center, Dept. of Mechanical Engineering, Pusan Nat'l Univ.)
  • 투고 : 2014.07.12
  • 심사 : 2014.10.06
  • 발행 : 2015.01.01
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초록

본 연구에서는 발전소의 혼합연료로서 바이오매스인 호두껍질(Walnut Shell)에 대한 연소특성을 조사하기 위하여 열중량 분석기(TGA)와 분류층 반응기(DTR)를 이용하여 실험을 수행하였다. 바이오매스 WS는 기존 석탄과 비교하여 낮은 온도 영역에서 활발한 연소반응을 보였고, 활성화 에너지 또한 낮은 값을 가짐으로써 연소반응속도가 더욱 증가함을 확인할 수 있었다. 바이오매스 WS와 역청탄의 혼소에 있어서 고정층 분석에서는 혼소 영향이 선형적으로 나타나는 것을 확인할 수 있었다. 그렇지만 분류층 반응기에서는 바이오매스 혼소율을 5%증가 시에는 UBC가 감소하다가 이후에 다시 UBC가 증가하는 Non-additive 현상을 확인할 수 있었다. 이는 바이오매스의 급격한 연소로 주위에 산소 부족현상이 생겨 석탄의 연소가 지연되는 것을 보여준다. 이 현상을 해결하기 위하여 산소를 증가시켜주었을 때 더 높은 혼소율을 성취할 수 있음을 보여주었다.

Combustion characteristics for co-firing of biomass (Walnut Shell) as blending fuel in coal fired boiler have investigated using thermogravimetric analyser (TGA) and drop tube reactor (DTR). The results show that devolatilization and char combustion for WS occurs at lower temperature than those of existing coals and has lower activation energy value, which is resulting in higher reactivity. When the WS is blended with coal, TGA results show linear profiles depending on blending ratio for each fuel. However, DTR results exist the non-additive phenomena for blending of WS. As blending ratio of WS increase, the UBC decrease at BBR 5%, but the UBC rather increase from BBR 10% due to oxygen deficiency formed from rapid combustion of WS. This paper propose that fuel lean condition by oxygen rich lead to higher blending ratio of biomass by solving the oxygen deficiency condition.

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