Dryer for sugar cane bagasse and/or medulla with a vertical type

Details Dryer for sugar cane bagasse and/or medulla with a vertical type Dryer for sugar cane bagasse and/or medulla with a vertical type

1991-05-30

1992-12-08

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With waste gas heat and/or power conservers

34174, 34228, 34166, F26B 1900

Patent

active

051686406

ABSTRACT:
This invention refers to a dryer for sugar cane bagasse and/or medulla with vertical type, mobile bed with countercurrent waste combustion gases consisting of: a cylindrical body like a silo. The load is fed into the top of the cylindrical body and is then evenly distributed by spreading devices. Combustion gases from conventional boilers with a high energy content and normally considered as waste are fed countercurrently with the assistance of a ventilator into the bottom of the dryer through slots or holes. Once the gases have picked up humidity while going through the silo, they are expelled through the top by means of a conduct to the boiler's chimney. Inside the dryer, the bagasse and/or medulla is moved slowly and constantly along Archimedes conveyors vertically, radially and rotating thus permitting broad exposure to the combustion gases, the dryer is further characterized because the vertical Archimedes conveyors are designed to have a varied pace, longer at the top and shorter at the bottom, that provides a bigger mix of the mobile bed at the top than at the bottom, thereby achieving a larger stratification in the bottom of the bed. It is also characterized because the mobile bed of bagasse and/or medulla acts in turn as a filtering element that retains the particles derived from the combustion gases making it possible to use less energy than in the known systems, providing longer residence and reducing the environmental pollution caused by combustion.

REFERENCES:
patent: 4217701 (1980-08-01), Mathews
patent: 4294019 (1981-10-01), Seitmann

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