화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Chemical Engineering Research, Vol.54, No.4, 533-542, August, 2016
DOI10.9713/kcer.2016.54.4.533  Export Citation
왕겨/모래/왕겨 회재의 유동 및 혼합 특성 연구
Flow Behavior and Mixing Characteristics of Rice Husk/Silica Sand/Rice Husk Ash
김보화1, 2, 서명원1, †, 국진우1, 최희망1, 라호원1, 윤상준1, 문태영1, 김용구1, 이재구1, 이영우2, †
  • 1한국에너지기술연구원 기후변화연구본부, 34129 대전광역시 유성구 가정로 152
  • 2충남대학교 에너지과학기술대학원, 34134 대전광역시 유성구 대학로 99
Bo Hwa Kim1, 2, Myung Won Seo1, 3, †, Jin Woo Kook1, 3, Hee Mang Choi1, 3, Ho Won Ra1, 3, Sang Jun Yoon1, 3, Tae Young Mun1, 3, Yong Ku Kim1, 3, Jae Goo Lee1, 3, and Young Woo Rhee2, †
  • 1Climate change research division, Korea Institute of Energy Research (KIER), 152, 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Korea
  • 2Graduate School of Energy Science and Technology, Chungnam National University (CNU), 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea
  • 3, Korea
E-mail:,
초록
Lab-scale 기포유동층 반응기(D=0.1 m, H=1.5 m)에서 왕겨와 모래를 혼합하여 가스화를 통해 합성가스를 얻고 남은 왕겨 회재는 고부가가치 물질로 사용하기 위한 연구의 선행연구로서 왕겨/ 유동사/ 왕겨 회재(실리카)의 혼합 및 유동특성을 규명하였다. 왕겨/유동사를 5:95, 10:90, 20:80, 30:70의 부피비로 유속 범위(0~0.63 m/s)조건으로 수행하였으며, 또한 왕겨 회재는 왕겨를 기준으로 부피비 6%로 결정하였다. 왕겨/유동사, 왕겨/유동사/왕겨 회재의 혼합실험을 통해 왕겨 부피비 0%, 5%, 10%에서는 최소유동화속도가 0.19~0.21m/s임을 확인하였고, 20%일때는 0.3m/s로 증가하였으며, 30%일때는 분리현상이 나타나 최소유동화속도가 측정 되지 않았다. 또한, 실험데이터에 따라 Brereton과 Grace의 mixing index를 이용하여 각 조건 별로 mixing index값을 도출한 결과 왕겨/유동사의 혼합은 0.8~1, 왕겨/유동사/왕겨 회재의 혼합은 0.88~1 사이임을 확인하였다. 이를 통하여 왕겨/유동사의 혼합과 왕겨/유동사/왕겨 회재 혼합의 최적 조업조건을 도출할 수 있었으며, 운전조건을 결정할 수 있었다.
We investigate fluidization characteristics of the mixture of rice husk, silica sand and rice husk ash as a preliminary study for valuable utilization of rice husk ash obtained from gasification of rice husk in a fluidized bed reactor. As experiment valuables, the blending ratio of rice husk and sand (rice husk: sand) is selected as 5:95, 10:90, 20:80 and 30:70 on a volume base. Rice husk ash was added with 6 vol% of rice husk for each experiment and air velocity to the reactor was 0~0.63 m/s. In both rice husk/sand and rice husk/sand/ash mixture, the minimum fluidization velocity (Umf) is observed as 0.19~0.21 m/s at feeding of 0~10 vol.% of rice husk and 0.30 m/s at feeding of 20 vol.% of rice husk. With increasing the amount of rice husk up to 30 vol.%, Umf can not measure due to segregation behavior. The mixing index for each experiment is determined using mixing index equation proposed by Brereton and Grace. The mixing index of the mixture of rice husk/sand and rice husk/sand/ash was 0.8~1 and 0.88~1, respectively. The optimum fluidization condition was found for the good mixing and separation of rice husk ash.
Keywords:Rice Husk;Silica Sand;Rice Husk Ash;Flow;Mixing;Fluidized Bed
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