Journal of Korea Society of Waste Management (한국폐기물자원순환학회지)

Korea Society of Waste Management (한국폐기물자원순환학회)
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Characteristics of Manufacturing Sawdust and Filtered and Dewatered Waste Oil Sludge Fuel (BOF) and Its Pyrolysis

톱밥과 여과 탈수 폐오일슬러지의 고형연료 제조 및 열분해 특성

  • Lee, Joo-Yong (Department of Environmental Engineering, Changwon National University) ;
  • Bae, Sung-Keun (Department of Environmental Engineering, Changwon National University) ;
  • Seo, Jeoung-Yoon (Department of Environmental Engineering, Changwon National University)
  • 이주용 (창원대학교 환경공학과) ;
  • 배성근 (창원대학교 환경공학과) ;
  • 서정윤 (창원대학교 환경공학과)
  • Received : 2014.06.03
  • Accepted : 2014.10.24
  • Published : 2014.12.31
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Abstract

The large amount of waste oil sludge was generated from waste oil purification process, oil bunker, or the ocean plant. Although it has high calorific values, it should be treated as a designated waste. During the recycling process of construction and demolition wastes or the trimming process of woods, a lot of sawdust is produced. In this study, the feasibility of BOF (biomass and waste oil sludge fuel) as a renewable energy source was estimated. For manufacturing a BOF, a press type pelletizing was better than an extruder type and also 40 ~ 60% of mixing ratio in waste oil sludge was appropriate to produce a pellet. The pellet was 13 mm in diameter and 20 mm in length. There was no fixed carbon in waste oil sludge, and its carbon content and higher heating value were 63.90% and 9,110 kcal/kg, respectively. With an increse of mixing ratio of sawdust, the carbon content and heating value of the BOF were dropped, but fixed carbon content was increased. The heating value of BOF was in the range of 6,400 ~ 7,970 kcal/kg at the mixing ratio of 40 ~ 60% in waste oil sludge. It means that the BOF can be classified as the $1^{st}$grade solid fuel. In TGA experiment carried out at heating rate of $10^{\circ}C/min$ and under nitrogen atmosphere, thermal decomposition of sawdust was occurred in two steps, but waste oil sludge was destructed in one step. The initiated cracking temperature of sawdust and waste oil sludge was 300 and $280^{\circ}C$ in respective and after $450^{\circ}C$ the thermal decomposition process of sawdust was slowly progressed by $800^{\circ}C$ in contrast to waste oil sludge. Thermal decomposition of waste oil sludge was finished around $600^{\circ}C$. It can be considered that this difference is due to the fixed carbon content. Thermal decomposition pattern for the pellet of mixing ratio over 50% in waste oil sludge was similar to that for waste oil sludge and thermal cracking was occurred between 300 and $350^{\circ}C$. As the mixing ratio of waste oil sludge in the pellet increased, the reaction of thermal cracking became fast.

Keywords

References

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