| 摘要 |
PROBLEM TO BE SOLVED: To drastically reduce sludge powder by providing a cutout for hitting the sludge powder into a heat transfer drum by centrifugal force at one portion of an evaporation steam delivery port. SOLUTION: Raw sludge 6 that is supplied from a sludge throw port 1a into a heat transfer drum 1 is dispersed so that it is along the inner wall of a heat transfer drum 1 by a distribution ring 3 that is rotated along with a spindle 2. Further, the raw sludge 6 is extended in a thin-film shape while being pressed against the inner wall of the heat transfer pipe 1 by a blade 4. Then, the raw sludge 6 gradually falls due to dead weight and pressure. In that case, the raw sludge 6 is heated by heated steam that is supplied into a steam jacket 5 of the fresh air of the heat transfer drum 1, and the water is evaporated for drying to become dry sludge 8. On the other hand, water that is evaporated from the raw sludge 6 is unloaded from an evaporation steam exhaust port 9. At this time, the sludge powder hits against a cut-out of an end part in the rotary direction of the evaporation steam exhaust port 9, thus drastically reducing the exhaust of the sludge powder from the evaporation steam exhaust port 9 to the outside.
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