Method for drying sludge
AssigneeBraunschweigische Maschinenbauanstalt
InventorWalter Ries
Life of this patent
Estimating the term…
Abstract
Pasty, aqueous sludges of industrial or sewage treatment origin are dried for further use as raw material. The sludge particles are loosened by intense motion and substantially dry gases are introduced under pressure into the loosened sludge. The moisture enriched gases are removed from the sludge. The loosening and drying may be facilitated by repeatedly and sequentially increasing and decreasing the total surface area of the sludge. The intense motion is imparted to the sludge by at least one sludge stirring member and the drying gases may be introduced through the stirring member. The surface area of the sludge may be increased by plough-shaped or scraper-shaped tools. The surface area of the sludge may be decreased by rollers.
Claims11
A method for continuously drying pasty, aqueous sludge, comprising the steps of continuously subjecting the sludge to an intense agitation by alternately subjecting the sludge particles to intense motions to enlarge the sludge surface, and to mechanical compression to reduce the sludge surface again for substantially loosening the individual sludge particles and for repeatedly bringing different sludge particles to the surface, pressure feeding drying gas into contact with the agitated sludge for absorbing the moisture from the sludge, and removing the gas enriched with moisture from the sludge, and wherein said pressure feeding of said drying gas is performed during said sludge compression whereby the dry pressurized gases are brought into surface contact with the sludge.
A method for continuously drying pasty, aqueous sludge, comprising the steps of spreading a flat layer of sludge on at least one substantially plane bottom, continuously subjecting the sludge to an intense agitation by alternately subjecting the sludge particles to intense motions to enlarge the sludge surface, and to mechanical compression to reduce the sludge surface again for substantially loosening the individual sludge particles and for repeatedly bringing different sludge particles to the surface, pressure feeding drying gas into contact with the agitated sludge for absorbing the moisture from the sludge, and removing the gas enriched with moisture from the sludge, said intense agitation comprising continuously agitating and mechanically compressing the sludge at sequentially arranged locations whereby the sludge surface is repeatedly increased and decreased by said agitating and mechanically compressing so that new sludge surfaces are being produced repeatedly, and wherein said pressure feeding of said drying gas is performed during said agitating and mechanically compressing so as to subject all sludge surfaces to a moisture absorbing gas flow under pressure.
Dependencies are inferred from the claim text.