Drying and gas or vapor contact with solids – Apparatus – Stationary receptacle or tube with agitator or conveyor
Patent
1996-04-18
1998-09-15
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Stationary receptacle or tube with agitator or conveyor
34179, 34185, 34203, F26B 1112
Patent
active
058062050
DESCRIPTION:
BRIEF SUMMARY
This application claims the benefits of PCT/CA94/00580 filed Oct. 18, 1994.
FIELD OF THE INVENTION
The present invention relates to a method and apparatus for dehydrating particulate material. Advantageously, the invention finds applications in the processing of waste matter such as toxic slurries, organic residue produced by meat processing plants, among others, in order remove water from the waste matter and also to remove odours and sterilize the waste matter.
For the purpose of this specification, the expression "particulate material" acquires a generic meaning and it is intended to encompass a collection of particles formed into a mass that contains water such as a watery mixture of substantially insoluble material (i.e, mud, slurry etc.) or an aggregate of discrete particles containing water. The term "dehydrate" is intended to designate a significant reduction in the water content of a certain material, without necessarily implying that the material is totally free of water.
SUMMARY OF THE INVENTION
As embodied and broadly described herein, the invention provides an apparatus for dehydrating particulate material, said apparatus comprising: dehydrated and an outlet end for discharging the particulate material in a dehydrated condition, said channel constituting a passageway to convey an air current therein in order to collect and transport water vapour released by the particulate material; constituting means for: said inlet end toward said outlet end; and position of particles thereof, whereby enhancing release of water vapour; conveying heated gas that communicates thermal energy to the particulate material in said channel to cause the particulate material to release water vapour, said duct being substantially isolated from said channel at least over a substantial segment of said channel in order to prevent contact between gaseous media in said passageway and in said duct over said substantial segment; channel and elevating a temperature of a gaseous medium flowing therethrough, whereby a mixture of air and water vapour egressing said passageway is supplied to said heating chamber to achieve heat gain and is then supplied to said duct in order to transfer heat to particulate material in said channel.
In a most preferred embodiment, the particulate material processed b, the apparatus is conveyed along a serpentine path comprising a plurality of horizontally disposed segments that are vertically offset one relative to the other. Each segment contains at least one screw conveyor that transports the particulate material from one end of the segment to the other. When the particulate material reaches the end of a given segment, it falls by gravity into the following segment of the path that is located at the lower level. An arrangement of baffles between the various segments of the serpentine path establishes two passageways for channelling gaseous media. The first passageway follows the serpentine path and is exposed to the particulate material being dehydrated in order to collect water and noxious vapours that are being released. More particularly, a fan creates an air current that flows in a direction contrary to the direction of movement of the particulate material in order to collect and transport water and noxious vapours released by the particulate material. At the end of the first passageway, the gases released by the particulate matter pass through a heating chamber that elevates the temperature of the gases to at least 750.degree. C. in order to incinerate the noxious vapours as much as possible. The hot and relatively clean gas is then directed to the second passageway which also follows the serpentine path in order to elevate the temperature of the particulate material and cause water and noxious vapours to be released. The arrangement of the first and second passageways is such as to prevent the hot gas media discharged from the heating chamber and the gas released by the particulate material that is being drawn toward the heated chamber to mix with each other. The purpose of this arran
REFERENCES:
patent: 2259210 (1941-10-01), Modave
patent: 4361100 (1982-11-01), Hinger
patent: 4872949 (1989-10-01), Wilwerding
patent: 5220733 (1993-06-01), Bothe et al.
patent: 5293696 (1994-03-01), Schmidt et al.
Bennett Henry A.
Wilson Pamela A.
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