| 摘要 |
PROBLEM TO BE SOLVED: To shorten length of the furnace. SOLUTION: A kiln body 1 comprising an inner cylinder 3 and an outer cylinder 2 and having a heating channel 4 between the inner and outer cylinders is constituted, and installed horizontally rotatably with the outlet 3b side of the inner cylinder 3 tilted down. The inlet 3a side of the inner cylinder 3 is provided with an input hopper 5 via a dust feeder 6, and the outlet 3b side is provided with a separating chamber 7 for separating pyrolysis gas 9 and pyrolysis residue 10 and taking them out. The inner wall surface of the inner cylinder 3 is provided with many stages of substantially horse-shoe gates 14 having a partially circumferentially cut notch 15 in the axial core direction. When wastes 8 are supplied into the inner cylinder 3, moved from the inlet 3a to the outlet 3b, and indirectly heated by hot air 11 passed through the heating channel 4 to be thermally decomposed, the wastes 8 moved from the inlet 3a side of the inner cylinder 3 to the outlet 3b side are reserved in an inlet side surface part of each gate 14 for a desired period every time they reach each gate 14. Thus, time taken for the wastes 8 to arrive from the inlet 3a of the inner cylinder 3 to the outlet 3b is extended.
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