Cooling process for material beds of bulk materials
OwnerKarl von Wedelinventor
Life of this patent
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Abstract
In a cooling process for material beds of bulk materials like cement clinker taking place on grate coolers increased bed depths and increased air velocities are provided by decelerating an upper layer of the material bed, which may be a fluidized bed of a fine fraction of the bulk material, with respect to the bottom layer or fixed bed of the material bed in order to obtain a material discharge of uniform temperature. For the purpose of such deceleration an adjustable stop wall is provided leaving an adjustable passage towards the grate for the material. The stop wall includes a thrust limit detector to allow for a crushing or passing of any chunks. Hot dribblings may be pneumatically recycled onto the top of the material bed by means of the increased air pressure.
Claims17
A process of cooling a material bed of bulk material such as cement clinker, said process comprising the steps of
- (a) conveying said material bed on a grate cooler comprising a grate, a free end of high material temperature and a discharge end of a respectively lower material temperature in a conveying direction from said feed end towards said discharge end at a predetermined conveying rate,
- (b) cooling said material bed while conveying it with a cooling medium such as air,
- (c) pressurizing said cooling medium underneath said grate to an extent sufficient to penetrate said grate and said material bed in an upward direction and essentially perpendicular to said conveying direction, said cooling medium thus first cooling a bottom layer and then an upper layer of said material bed, and
- (d) decelerating said upper layer of said material bed with respect to said conveying rate of said grate.
A device for decelerating an upper layer of a material bed of bulk material such as cement clinker, which material bed is conveyed in a conveying direction on grate means defining a feed end and a discharge end, the temperature of said material decreasing from said feed end towards said discharge end by way of cooling said material by a cooling medium such as air which is pressurized to pass said material bed in a direction essentially perpendicular to said conveying direction from the underside of said grate means, said material bed and said grate means extending between lateral wall means essentially defining the width of said material bed, wherein said device comprises stop wall means extending between said lateral wall means and contacting said material bed from above at the region of said discharge end so as to leave a passage between said stop wall means and said grate means for discharging said material bed.
Dependencies are inferred from the claim text.