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US 3,938,949 AGranted
Method and apparatus for burning pulverulent materials
AssigneeF. L. Smidth & Co.
InventorSoren Bent Christiansen
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AssigneeF. L. Smidth & Co.
InventorSoren Bent Christiansen
Estimating the term…
A method and apparatus is disclosed for burning pulverous or granular material, particularly cement raw material to cement clinker. Burning of the pulverous material is accomplished in a plant which includes a suspension preheater, a rotary kiln and a separate rotary cooler unit having an inlet end and an outlet end, for cooling the burnt material exiting from the kiln by means of air which is subsequently used for combustion and preheating purposes. The method comprises dividing the heated cooling air into at least two streams, directing the divided heat cooling air out of both ends of the rotary cooler unit in its divided streams, directing at least one stream to the rotary kiln to be used as combustion air, directing exhaust gases from the rotary kiln to the preheater to preheat the material, and directing the other stream of heated cooling air to the preheater to preheat the material prior to being burnt in the rotary kiln.
A method of burning pulverous or granular material in a plant including a suspension preheater, a rotary kiln and a separate rotary cooler unit, said cooler unit having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube, the kiln having an inlet end portion and an outlet end portion for cooling the burnt material by means of air subsequently used for combustion and preheating purposes in the plant, which comprises directing cooling air into the planetary cooler tubes and from the planetary cooler tubes into the central cooler tube, dividing the heated cooling air into at least two streams within the central cooler tube, directing the divided heated cooling air out of both ends of the rotary cooler unit in its divided streams, directing at least one stream to the rotary kiln to be used as combustion air, directing exhaust gases from the rotary kiln to the preheater to preheat the material, and directing the other stream of heated cooling air to the preheater to preheat the material prior to being burnt in the rotary kiln.
A rotary kiln plant for burning pulverous or granular material comprising a suspension preheater, an inclined rotary kiln and a separate rotary cooler, the rotary cooler having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube and being connected at one end by at least one duct to the lower end of the rotary kiln and communicating at the other end portion with the suspension preheater, means for directing cooling air to the planetary cooler tubes and from the planetary cooler tubes to the central cooler tube in such a manner that the heated cooling air from said rotary cooler is divided into two streams, means for directing a first stream of said preheated cooling air to the rotary kiln for use as preheated combustion air, means for directing the second stream to the suspension preheater for preheating the material to be burnt in the kiln, and means associated with the rotary kiln for directing the hot product from the kiln to the rotary cooler.
A rotary kiln plant for burning pulverous or granular raw material comprising a suspension preheater, an inclined rotary kiln and a separate rotary cooler unit, the rotary cooler unit having a central cooler tube provided with a plurality of cooler tubes arranged in planetary fashion about the central cooler tube and being connected at one end by at least one duct to the material output end portion of the rotary kiln and communicating at the other end with the suspension preheater, the cooler unit further being connected to a stationary combustion chamber for at least partially burning the raw material prior to feeding it into the suspension preheater, means for directing cooling air to the planetary cooler tubes and from the planetary cooler tubes to the central cooler tube in a manner such that the heated cooling air from said rotary cooler is divided into two streams, means for directing a first stream of said preheated cooling air to the rotary kiln as preheated combustion air, means for directing the second stream of preheated cooling air to the preheater, and means associated with the rotary kiln for directing the hot product from the kiln to the rotary cooler.
Dependencies are inferred from the claim text.