Furnaces – With fuel treatment means – Preliminary refuse treatment means
Patent
1992-05-22
1994-05-10
Savage, Matthew O.
Furnaces
With fuel treatment means
Preliminary refuse treatment means
110238, 210180, 422176, 422201, F23G 504
Patent
active
053098498
ABSTRACT:
A sludge drying system using exhaust air from a furnace in a direct heat, rotary drum dryer to simultaneously dry and pelletize the sludge. The dried sludge particles exiting the dryer is entrained in the exhaust air. The sludge particles are separated from the exhaust air and then classified according to size. The exhaust air is treated in a treatment section, and then divided into two exhaust air streams or portions. A first portion of the exhaust air is discharged into the environment, while the second, larger portion of the exhaust air is recycled back to the furnace to be used to dry the sludge in the drier. In one embodiment, the exhaust air treatment section is provided with a spray condenser and a bio-filter. In another embodiment, the exhaust air treatment section is provided with a heat exchanger for exhaust air. In yet another embodiment, the exhaust air treatment section is provided with a heat exchanger for the cooling water of the condenser as well as a heat exchanger for the recycled exhaust air. In still another embodiment, the exhaust air treatment section is provided with a plurality of heat exchangers and the furnace is modified with an exhaust air deodorizing chamber.
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Andritz TCW Engineering GmbH
Savage Matthew O.
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