Journal of Korea Society of Waste Management (한국폐기물자원순환학회지)

Korea Society of Waste Management (한국폐기물자원순환학회)
권호 표지

Combustion Characteristics and Kinetics Parameters of Thermal-treated Sewage Sludge/coal Blends

열처리한 하수슬러지와 석탄 혼합물의 연소 특성과 속도론 인자 분석

  • Park, Sang-Woo (Department of Civil & Environmental Engineering, Hanbat National University) ;
  • Jang, Cheol-Hyeon (Department of Civil & Environmental Engineering, Hanbat National University)
  • 박상우 (한밭대학교 건설환경공학과) ;
  • 장철현 (한밭대학교 건설환경공학과)
  • Published : 2012.03.30
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Abstract

The combustion characteristics and kinetic parameters of thermal-treated sludge, coal, and sludge/coal blends were investigated, and the corresponding results are given as follows: In the case of the differential thermogravimetric (DTG) characteristics below $300^{\circ}C$, two peaks were observed, and therefore, over $300^{\circ}C$, only a single peak was observed. As for the parameters for the combustion characteristics, initial temperature (IT) was slightly high because of the high thermal treatment temperature of the sludge, and hence, even burnout temperature (BT) showed similar results. The sludge/coal blends had different proportions of IT and BT, depending on the type of coal. The optimum reaction order values ranged from 4.0 to 4.2 for the devolatilization step, whereas the values for the char combustion step ranged from 1.4 to 2.3. These values were higher than that of coal, whose values ranged from 1.1 to 1.3. The activation energy of the sludge/coal blend depended on the type of coal; however, the activation energy decreased as the of amount of sludge increased. Therefore, the pre-exponential factor (A) of combustion of the sludge/coal blend was lower than that of a single combustion of only coal. It was found that due to the low reaction rate constant (k) values, the combustion rate was low.

Keywords

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