F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
34/10.1
F26B 3/08 (2006.01) F26B 3/084 (2006.01) F26B 3/088 (2006.01) F26B 21/04 (2006.01)
Patent
CA 2006507
INVENTOR: KARL KELLER INVENTION: METHOD FOR DRYING SLUDGE ABSTRACT OF THE DISCLOSURE A sand layer is fluidized by a gas stream or current in a fluidized bed dryer and indirectly heated by immersed stationary heat-exchanger tubes. The sludge to be dried is continuously fed under pressure in a pumpable condition from above onto the fluidized sand layer. The sludge is coagulated in the fluidized sand layer to form sludge lumps. Here, the sludge lumps are successively dried from the surface down to the core thereof, and the already dried layers of the sludge lumps are successively abraded by the fluidized sand, whereby the sludge lumps are entirely comminuted and the dry matter thereof is pulverized to form dust. This product dust is continuously discharged together with the exhaust-gas stream from the fluidized bed dryer and continuously separated as a product from the exhaust-gas stream. The gas stream or current freed from dust is partially recycled in a closed circuit back to the fluidized bed dryer for fluidization of the sand layer.
Gowling Lafleur Henderson Llp
Sulzer-Escher Wyss Gmbh
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