US3745667A — Cooling apparatus and method

Claim 1

Independent Claim 117 words

A method for cooling material, especially cement clinker, fired in a furnace system in a primary cooling stage and a secondary cooling stage comprising the steps of: passing cooling air through the secondary cooling stage to directly cool the material in the secondary stage; feeding the entire amount of cooling air used in the secondary cooling stage for the direct cooling of the material through the primary cooling stage, and controlling the amount of cooling air in dependence on the air pressure in the primary cooling stage and the level of material in the secondary cooling stage for providing uniform filling of the secondary cooling stage with material and maintaining the required end temperature of the material.

Claim 2

Independent Claim 117 words

A method for cooling material, especially cement clinker, fired in a furnace system in a primary cooling stage and a secondary cooling stage comprising the steps of: passing cooling air through the secondary cooling stage to directly cool the material in the secondary stage; feeding the entire amount of cooling air used in the secondary cooling stage for the direct cooling of the material through the primary cooling stage, and controlling the amount of cooling air in dependence on the air pressure in the primary cooling stage and the level of material in the secondary cooling stage for providing uniform filling of the secondary cooling stage with material and maintaining the required end temperature of the material.

Claim 3

Dependent Claim 29 words

The method as in claim 1 wherein the cooling air in the lower portion of the secondary cooling stage is distributed uniformly at various places directly into the material.

Claim 4

Dependent Claim 135 words

Apparatus for cooling material, especially cement clinker, fired in a furnace system comprising: a primary cooler for receiving and partially cooling the material; a secondary cooler for receiving and further cooling the partially cooled material; means for passing cooling air through the material in the secondary cooler to cool the material therein; means for feeding the entire amount of cooling air used in the secondary cooling stage for the direct cooling of the material through the primary cooler and then to the furnace system; and means for controlling the amount of cooling air supplied in accordance with the air pressure in the primary cooling stage and the level of the material in the secondary cooling stage for providing uniform filling of the secondary cooler with material, and maintaining the required end temperature of the material.

Claim 5

Dependent Claim 135 words

Apparatus for cooling material, especially cement clinker, fired in a furnace system comprising: a primary cooler for receiving and partially cooling the material; a secondary cooler for receiving and further cooling the partially cooled material; means for passing cooling air through the material in the secondary cooler to cool the material therein; means for feeding the entire amount of cooling air used in the secondary cooling stage for the direct cooling of the material through the primary cooler and then to the furnace system; and means for controlling the amount of cooling air supplied in accordance with the air pressure in the primary cooling stage and the level of the material in the secondary cooling stage for providing uniform filling of the secondary cooler with material, and maintaining the required end temperature of the material.

Claim 6

Dependent Claim 78 words

The apparatus set forth in claim 3 including a conduit connecting the secondary cooler and the primary cooler for conveying the total amount of cooling air therebetween, a throttle valve in said conduit; control means, actuable by the air pressure in the primary cooler, for controlling said throttle valve, said secondary cooler including a plurality of closable outlets; and means responsive to the temperature and amount of material in said secondary cooler for opening and closing said outlets.

Claim 7

Dependent Claim 27 words

The apparatus set forth in claim 4 wherein said secondary cooler has a number of similarly formed sections disposed in parallel, and open to the primary cooler.

Claim 8

Dependent Claim 30 words

The apparatus set forth in claim 5 wherein the sections of the secondary cooler lie in sequence and are connected to a common material feed chamber including a drag chain.

Claim 9

Dependent Claim 79 words

The apparatus set forth in claim 6 wherein each secondary cooling section has a number of outlets; said means for opening and closing said outlets comprises a plurality of individually controlled barrier elements, temperature measuring means for measuring the temperature of the material in the secondary cooler, mEans for sensing the level of material in said secondary cooler, and means responsive to said temperature measuring means and said level sensing means for controlling the positions of said barrier elements.

Claim 10

Dependent Claim 48 words

The apparatus set forth in claim 4 wherein said responsive means includes a temperature measuring device and a fullness measuring device connected together by a timing circuit, whereby the temperature measuring device can be switched off and on to provide maximum filling of the secondary cooler with material.

Claim 11

Dependent Claim 20 words

The apparatus set forth in claim 4 including a material reducing device between the primary cooler and the secondary cooler.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-07-16	1977-01-15	1977-07-17	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-07-16	1981-01-15	1981-07-17	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-07-16	1985-01-15	1985-07-17	$7700.00	Window Closed / Lapsed

Cooling apparatus and method

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