外熱式キルン炉におけるごみ熱分解の促進 : 第2報,伝熱促進に関する研究(熱工学,内燃機関,動力など)

概要

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The effects of rotating speed and internal structure on the performance of externally heated rotary kiln for the waste pyrolysis were in vestigated. For this purpose newly developed evaluation method of the overall heat transfer coefficient (k_<m-w>) from the internal wall to the wastes was adopted. The experimental results showed that k_<m-w> monotonically increased with number of the lifter and the height of the lifter. As six lifters with 200mm height were attached to the inside wall of the kiln, the mean value of k_<m-w>increased from 38.6 W/m^2 K to 45.3 W/m^2 K at 2.7rpm. In addition, k_<m-w> increased to 50.1 W/m^2 K as the rotating speed increased to 4.0rpm. In the water vaporization phase during the course of pylorysos process, the height of the lifter had a significant influence on the k_<m-w>. On the other hand, the number of the lifter had a significant impact on the k_<m-w> in the plastic base wastes pyrolysis phase. According to the measurement the installation of lifters to attain the ratio of the height of lifter (H_l) to the thickness of the waste bed (H_w) larger than 0.45 or the arc length between the two lifters (L_l) to the arc length of the interface between the bed material and the kiln wall (L_w) larger than 1 gives 10% increase of k_<m-w>.
2008-07-25