Slurry dryer
AssigneeScott Equipement Company
InventorWilliam A. Luker
Life of this patent
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Abstract
An improved slurry dryer of the type having a plurality of beater blades carried on a rotating shaft in a cylindrical housing, the improvement in combination therewith of a plurality of scraper blades mounted on at least one disk carried by the rotating shaft at the inlet end of the dryer for scraping the cylindrical side wall and the end wall to prevent the material entering the dryer from adhering and remaining on the side and end wall of the cylindrical housing. The scraper blades are replaceable and adjustable with respect to the side and end walls of the housing by slotted mounting to accommodate wear of the scraper blades. An air dam in the form of a radially extending disk is provided downstream of the scraper blade disks to direct drying air radially outward to impinge on the slurry material to be dried.
Claims24
An improved air swept tubular single pass slurry dryer of the type having a plurality of beater blades carried on a centrally located shaft in a cylindrical housing, the improvement in combination therewith comprising:
- a) an air inlet aperture located at an inlet end of the cylindrical housing for admitting forced convection air at an elevated temperature into the housing;
- b) an inlet scraper blade assembly located immediately adjacent the inlet end of the cylindrical housing and having
- i) an inlet scraper blade support carried by the shaft in an inlet region of the slurry dryer,
- ii) at least one end wall scraper blade rigidly carried by the inlet scraper blade support and positioned adjacent an inlet end wall of the housing,
- iii) at least one side wall scraper blade rigidly carried by the inlet scraper blade support and positioned adjacent a cylindrical side wall of the housing,
- c) a radially projecting air dam mounted on the shaft downstream of the inlet scraper blade assembly to direct the air radially outward and towards the slurry material to be dried;
- wherein the side wall scraper blades and the end wall scraper blades are each positioned to rotate in a fixed relationship with the shaft to prevent buildup of material on the inside of the cylindrical housing in the inlet region thereof and the air dam forces the air to remain in contact with the slurry material as it leaves the inlet region of the dryer.
A method of drying a high liquid content slurry in a continuous flow process comprising the steps of:
- a) injecting a high liquid content slurry material to be dried into a cylindrical housing by passage through a material inlet aperture in an inlet end wall of the housing;
- b) rotating a shaft concentrically located in the housing wherein the shaft has at least one inlet disk located on and rigidly mounted for rotation therewith in an inlet region of the housing adjacent the inlet end wall;
- c) scraping an interior of the inlet end wall of the housing by at least one end wall blade rigidly mounted on a side of the inlet disk to prevent buildup of the slurry material on the inlet end wall;
- and
- d) scraping an interior of the cylindrical housing in the inlet region by at least one side wall blade rigidly mounted on the periphery of the inlet disk to prevent buildup of the slurry material on the side wall of the housing in the inlet region thereof.
An improved air swept tubular single pass slurry dryer of the type having a plurality of beater blades carried on a centrally located shaft in a cylindrical housing, the improvement in combination therewith comprising:
- a) a plurality of scraper blade support disks with an inlet scraper blade disk located immediately adjacent the inlet end of the cylindrical housing, wherein all of the scraper blade disks are rigidly secured to and carried by the shaft at an inlet region of the slurry dryer;
- b) a plurality of removable cylindrical wall scraper blades rigidly mounted to and spaced about the periphery of each scraper blade support disk;
- c) a plurality of removable end wall scraper blades rigidly mounted to and spaced around a side of the inlet scraper blade support disk facing an inlet end wall of the cylindrical housing of the dryer;
- wherein the cylindrical wall scraper blades and the end wall scraper blades are each positioned to rotate in a fixed relationship with the shaft to scrape the wall adjacent thereto to prevent buildup of material on the inside of the end and cylindrical walls of the cylindrical housing in the inlet region thereof.
Dependencies are inferred from the claim text.