US1404381A - Rotary kiln - Google Patents

Description

J. S. FASTING.

ROTARY KILN.

APPLICATION FILED MAR.2l,'I921.

1,404,381, Patented Jan. 24, 1922.

J'OHAN SIG'ISMUND FASTING, OF FREDERIKSBERG, NEAR COPENHAGEN, DENMARK,

ASSIGNOR TO F. L. SMID'IH do 60., OF NEW JERSEY.

YORK, N. Y., A. CORPORATION OF NEW ROTARY KILN.

Application filed March 21, 1921. Serial No.

To all whom it may concern Be it known that I, J OHAN S. FAs'rINe, a subject of the King of Denmark, residing at Frederiksberg, near Copenhagem'Denmark, have invented certain new and useful Improvements in Rotary Kilns, of which the following is a specification, reference being had to the accompanying drawing, forming a part hereof. f 1

Thi invention is concerned -with the means for cooling the clinker as it is discharged from the kiln proper and particularly with coolers which are directly associated with the kiln and in effect form part of the general kiln structure. It is usual in cooling devices of this general character to introduce cooling'air in adirection contrary to the movement of the clinker as it i discharged and in contact therewith, thereby cooling the clinker, and to conduct the thus heated air into the combustion .zone of the kiln where it supports combustion. The cooling effect, in the operationof structures heretofore designed for this purpose, has been limited and incomplete because the volume of air admitted for cooling purposes has necessarily been limited to the maximum volume of an required tosupport combus tion in thekiln. In accordance with the present invention, however, there are provided means whereby there is admitted to the cooler a volume of air in excess of that required to support combustion in the kiln, and mean whereby a portion of the air which has passed through the cooler is withdrawn before it enters the mouth of the kiln proper. Thereby a much greater cooling effect is produced than has been possible heretofore and at the same time combustion within the kiln is not impaired by, an excess of air. The invention will be explained more fully hereinafter with reference to the accompanying drawing in which it is illustrated as embodied in a practical form and in which- Figure 1 is a view in longitudinal section of the discharge end of a rotary kiln, with the improved cooling devices combined therewith.

Figure 2 is an end view of the parts shown in Figure 1 as seen from the right hand.

The kiln proper, or kiln cylinder 1 may beconstructed, supported and operated in any usual or suitable manner. Surrounding the end portion of the cylinder 1, and con Specification of Letters Patent.

Patented Jan. 24, 1922.

veniently supported thereon, as by radial supports 3, is a drum 2 of larger diameter than the kiln 1, so as to form an annular channel between itself and the kiln. The drum 2' is open at the end toward the feeding end. of the kiln and s closed, except as hereinafter explained, at the other end, which is extended somewhat beyond the discharge end of the kiln so as to form a chamber at the end of the kiln. A second drum 4, of larger diameter than the drum 2, and closed at the end toward the feeding end of the kiln, but open at the other end, is preferably supported, so as to rotate with the kiln and the drum 2, as by radial plates 14, so as to form an annular space which communicates with the space between the kiln 1 and the drum 2 and forms therewith a channel through which the clinker moves from the end of the kiln 1 until it is discharged from the end of the drum 4, and through which the cooling air moves in a contrary direction from the open end of the drum 4 into the chamber at the end of the kiln 1. The radlal plates 14 serve as lifters or shovels by which the clinker is carried around with the drums 2 and 4 as they rotate and is brought into contact with the cooling air throughout its movement of revolution, at the same time moving toward the discharge end of the drum 4 and escaping from the drum 4 at and near its lowest point.

The cooling air-is admitted to the chamber between the drums 2 and 4 throughout its annular open end, in order that the cooling of the clinker may proceed in all parts of such annular chamber. For this purpose air is discharged under pressure from a. suitable blower or compressor throu h an air inlet pipe 7 into an annular cl lamber 6 formed upon or with a disc-like plate 12, the annular chamber 6- having' an annular orifice 8 through which the air is disohar into the open annular end of the cham r between the drums 2 and 4. The plate 12 has suitable clearance from the plate 9 which forms the end of the drum 2 and hill formed in itself a concentric opening 10 of rather large diameter as indicated. A diaclike plate 11, preferably of slightly larger diameter than the opening 10, 1s su ported within the plate 9 and spaced there rom so as to leave a. free exit for excess air, be' conveniently supported from the late 15 as by studs 11; Air in the space bmcon the plate or shield 11 and the plate 12 finds an "*exit through a discharge pipe 13 which may conduct the already heated air to a place of use or to an exhaust fan. The usual fuel supply pipe 15 is introduced into the kiln through the wall or plate 12, the opening 10 in the wall or plate 9, and the shield or plate 11.

In the operation of the kiln with the cooling devices described the clinker falls from the kiln cylinder 1, at its lower end, into the drum 2 and after accumulating therein to a limited extent, works forward on the inside of the drum 2 until it falls from the upper end of the drum 2 into the drum 4, in which, as already explained, it is carried around by the radial plates 14 and at the same time travels toward the right end until it is discharged from the drum 4 at and near the lowest part of its open end. The cooling air, supplied in large volume, much in excess of that required to support combustion in the kiln, isdelivered through the annular orifice of the annular chamber 6 into the open end of the annular chamber between the drums 2 and 4 and then travels, in opposition to the movement of the clinker, toward the left hand through the annular chamber between the drums 2 and 4, around the left hand end of the drum 2, and toward the right hand in the annular chamber between the kiln 1 and the drum 2 until it enters the chamber at the end of the kiln 1. Some of the air which enters the last mentioned chamber passes into the kilnl, in suflicient quantity to support combustion therein. The excess air, above that required to support combustion in the kiln, passes off through the space between the end wall 9 and the shield 11 and the large opening =10'in the end wall 9 and esca es through the air-discharge opening 13. he volume of excess air, above the requirements of combustion in the kiln, can be regulated by controlling, in the usual manner, the admissson of air through the air inlet pipe 7'and the escape or withdrawal of air through the air outlet pipe 13 and it will be obvious that the volume of air admitted can be so great as to cool the clinker effectually without in any ldielgree impairing combustion within the I claim as my invention:

1. The combination with a rotary kiln, of clinker cooling devices in direct communication with the kiln and directly incorporated therewith, means to admit to the cooling devices'coohng air in excess of the requirements for combustion in the kiln, means to conduct from the cooling devices to the kiln the air necessary to meet the requirements for combustion, and meansto permit the escape of the excess of air after contact with the clinker andbefore admission to the kiln.

2. The combination with a rotary kiln, of

the clinker travels longitudina clinker cooling devices comprising an annular chamber concentric with the kiln, open at one end and communicating at the other end with a chamber at the end ofthe kiln and into which tlie clinker is discharged from the kiln and through which the clinker travels longitudinally, means to introduce into the open end of the annular chamber cooling air in excess of the requirements of combustion in the kiln, and means to permit the escape of the excess of air from the chamber at the end of the kiln.

3. The combination with a rotary kiln, of clinker cooling devices comprising an annular rotating chamber concentric with the kiln, open at one end and communicating at the other end with a chamber at the end of the kiln and into which the clinker is discharged from the kiln and through which ly, Said chamber being provided with radial plates to carry the clinker around in its rotation, means to introduce into the open end of the annular chamber cooling air in excess of the requirements of combustion in the kiln and means to permit the escape of the: excess of air from the chamber at the end of the kiln. 4. The combination with a rotary kiln, 01* a drum, surrounding the lower end portion of the kiln and extended beyond the same, open at its upper end and having at its other end an end wall to form an annular chamber about the kiln and a chamber at the end of the kilh, said drum being adapted to receive the clinker from the kiln and to discharge the same at its open upper end, means to introduce air into the annular chamber in excess of the requirements of combustion in the kiln and means topermit the escape of the excess air from the chamber in the end of the kiln. 5. The combination with a rotar kiln, of a drum, mounted to rotate with the 'ln, open at its upper end and having at its other end an end plate, formingean annular chamber about the kiln and a chamber at the end of the kiln, a second drum, closed at its upper end and open at its lower end and forming about the first drum anannular chamber in communicationwith the chamber between the kiln and the first drum, means to introduce into the annular chamber between the first drum and the second drum air in-excess of the requirements of combustion and means to permit the esca of the excess air from the chamber at the end of the kiln.

6. The combination with a rotary kiln, of a drum. surrounding the lower end portion of the kiln, having its upper end open and at its lower end an end late with an opening therein, a shield within the end plate and spaced therefrom and covering the opening t erein, and means to introduce into the annular chamber at its 0 n end air in excess of the requirements 0 combustion, the excess air being permitted to escape from the chamber at the end of the kiln through the space between the shield and the end plate and through the opening in the end plate.

7. The combination with a rotary kiln, of a drum mounted to rotate with the kiln, open at one end and having at the other end an end plate with an opening therein, said drum fbrming an annular chamber about the lower end portion of the kiln to receive the clinker therefrom, a second drum also mounted to rotate with the kiln, open at its lower end and closed at its upper end and surrounding the first named drum and forming therewith an annular chamber in communication with the first mentioned annular chamber and means to introduce into' the open end of the last mentioned chamber air in excess of the requirements of combustion in the kiln, the excess of air being permitted to escape from the chamber at the end of the kiln through. the opening in the end p ate.

.8. The combination with a rotary kiln, of a drum mounted to rotate with the kiln, open at one end and having at the other end an end plate with an opening therein, said drum forming an annular chamber about the lower end portion of the kiln to receive the clinker therefrom, a second drum also mounted to rotate with the kiln, open at its a lower end and closed at its upper end and surroundin the first named drum and fornr ing therewith an annular chamberinfcoin' munication with the first mentioned annular chamber and means to introduce into the open end of the last mentioned chamber air in xcess of the requirements of. combustion inthe kiln, the excess of air being permitted to escape from the chamber at the end of the kiln through the opening in the end plate, the second named annular chamber having longitudinal, radial plates to carrythe clinker with thedrum in its rotation.

9. The combination with a. rotary kiln, of a drum mounted to rotate with the kiln, open at one end and having at the other end an end plate with an opening therein, said drum forming an annular chamber about the lower end portion of the kiln to receive the clinker therefrom, a second drum also mounted to rotate with the kiln, open at its lower end and closed at its upper end and surrounding the first named drum and forming therewith an annular chamber in communication with the first named annular chamber, means to introduce into the open end of the last mentioned chamber air in excess of the requirements of combustion in the kiln, the excess of air being permitted to escape from the chamber at the end of the kiln through the o ning in the end plate, and a shield withln the end plate of the first drum, spaced therefrom and covering the opening in the end plate.

10. The combination with a rotary kiln, of clinker cooling devices comprising an annular chamber surrounding the lower end portion of the kiln and adapted to receive the clinker from the kiln at one end and to an-annular' air chamber having an annular -orifice for the discharge of air into the first mentioned annular chamber in a direction opposite to the direction of movement of the clinker therethrough.

This specificationsigned this 24th day of February A. D. 1921.

J OHAN SIGISMUND BASTING.

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