US1707191A - Rotary-kiln feed - Google Patents

Description

March 26, 1929. E. MINOGUE ROTARY KILN FEED 2 Sheets-Sheet 1 Filed June 18, 1926 F Max. 26, 1 929.

v UNITED STATES PATE ltfllhfllflfi E. MINOG'UE, U1? MANITUWUU, WISCONSIN, ASSIGNbR T MINOGUE. ENGINEER- I'Ntl- UMPANY, 0F MANIJIPUWOU, WISCONSIN.

application filed .Ilune lit,

This invention" relates to a device for feeding the flue dust to the kiln of a wet process cement plant its heretofore practiced, it is the usual custom to mix the flue dust with the wet slurry. lhis flue dust has properties that make the slurry practically impossible to-handle and,

consequently, materially decrease the value of the output from the plant.

This invention is designed to overcome the above noted defects in recovering flue dust and mining it with the outgoing ma- ;terial under treatment, and has for its primary objects the mixing of the flue dust with the contents of the kiln in its dry form, and the returning of the flue dust to the kiln in the dry tone. lln these devices it is highly advantageous to prevent the entrance of cold air into the kiln. This invention also has for its objects the provision of means for feeding the flue dust uniformly into the kiln while it is in operation without allowing the entrance of cold air.

.drn embodiment of the invention is shown in the accompanying drawings in which Figure l is a transverse sectional view through a rotary kiln showing the feeding device in operation. a

Figure 2 is a fragmentary side view with parts broken away showing a portion of the structure illustrated in Figure l.

Figure 3 is a sectional view developed along the line 33 of Figure l.

*lfleferring to the drawing it will be seen that a rotary kiln l of the inclined type is provided. 'llhis kiln is preferablyv lined with flre brick or fire clay, as indicated at 2 in Figure l, inthe usual manner. llt is surrounded at any suitable point in its length by an annular receiving compartment 3 which receives the flue dust in a continuous stream from any suitable source, such flue dust being fed downwardly through the pipe t; This flue dust collects in the lower portion of the annular chamber '3 and is picked up and delivered by the mechanism hereinafter described at each revolution of the kiln.

Thekiln is provided with a curved pipe 5 which is preferably formed in sections and is returned to the kiln at the dry zone and in which is provided with a ap or valve 6 intermediate its length. This valve is rigidly carried by a rocker shaft 7 which projects outwardly beyond the side of the pipe 5 and is provided with a lever 8, and with a rocker at a or lever 9.. The lever t is attached to race. serial no. iiaaer.

,lected thereby, through such portion. The

outer end of the pipe 5 is flared to form a funnel-like scoop M which digs into the dust in the lower portion of the receptacle 3 and scoops up the dust into the pipe 5.

The operation of the apparatus is as follows: r

the kiln is rotated in the direction indicated by the arrow in Figure l, and the pipe 5 is filled with flue dust while the pipe passes through the lower portion of the compartment 3. However, the pipe 5 is closed throughout the major portion of the rotation of the kiln by means of the valve 6. ll hernhowever, the load (see Figure 1) covers the mouth of the pipe 13, the flap or valve 6 opens. 'llhis opening is accomplished by the riding of the roller 11 upon the cam track 12, the position of the parts being as indicated in Figure l. The flue dust is thus discharged by gravity past the valve through the pipe 5 and into the kiln 1. it is to be noted that the valve closes before the pipe passes from beneath the load 15 within the kiln and consequently there is, at all times, a cold air seal as the pipe is either closed by the load within the kiln, or else is closed by'the' valve. in addition tothis the flue dust is evenly distributed and mixed with the load within the kiln by thisv apparatus, as it is gradually discharged into the kiln by the action of gravity during the rotation of the kiln. lln addition to this, each rotation of the'kiln discharges a predetermined measured amount of the flue dust into the kiln, and, consequently, insures the uniformity of the mixture. p

lt will be seen, therefore, that the ac dust its dried state. Consequently, the output is of a maximum quality, although the flue till till

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vided for accomplishing the above noted functions and it will be seen further, that the device is wholly automatic in its action, and does not require any thought on the part of the operator. I

It is a well known fact in the cement industry that the capacity of a wet process kiln is limited by the amount of slurry which can be fed into the open end of the kiln. This is due to the slurry, which contains approximately 33% moisture, spilling back out of the open end of the kiln, and it is also to a certain extent due to the fact that increasing the amount of slurry put into the open end of the kiln, increases the length of What is commonly called the wet zone of the kiln. It being a well known fact that the shorter the wet zone in the kiln the greater its. efficiency is.

In the practice of this invention, it is a parent that any desired material may e fed into the kiln by the apparatus described and it is further apparent that the particular point or zone of the kiln may be selected as desired.

For example, it may be found expedient to feed the slurry into the kiln by means of the construction described in detail above and in this case the slurry would be fed into the wet zone of the kiln.

. V, In this way, it is possible to feed any material at any point of the kiln with the utmost facility.

It is, therefore, to be understood that this construction can be used for theintroduction of slurry into the kiln as well as for the introduction of flue dust, as previously set forth in detail.

This invention, therefore, provides a novel means of introducing material into a kiln through a hole in the side of the kiln where the feed pipe opens. Obviously, therefore, the efliciency of the kiln and the capacity thereof, can be greatly increased in thedetermined as claimed.

I claim: 1. The combination of a rotary kiln, an

annular chamber surrounding said kiln,

means for conducting material into said chamber comprising a material collecting pipe rigidly carried by said kiln and adapted to rotate with said kiln, said pipe having a discharge mouth opening into said kiln, said pipe being located-within said annular chamber, a valve located within said pipe, and

means for opening said valve only at the charge mouth opening through sai kiln at one end and having a scoop-like portion at its other end adapted to scoop up a charge of dust during each revolution of the kiln, said scoop-like portion and said discharge mouth being circumferentially spaced around said kiln with the scoop-like ortion leading, a valve located within said pipe, and means for opening said valve when said discharge mouth is adjacent its lowest position and said scoop-like portion is elevated, and means for holding said valve closed when said mouth has passed from a position adjacent its lowest position.

3. The combination of a rotary kiln, an annular dust receiving chamber surrounding the kiln, means for conducting dust into said chamber comprising a curved pipe partly encircling said kiln and rigidly carried by said kiln and located within said annular chamber, said pipe having a discharge mouth opening through said kiln at one end and having a scoop-like portion at its otherend adapted to scoop up a charge of dust during each revolution of the kiln, said scoop-like portion and said discharge mouth being circumferentially spaced around said kiln with the scoop-like portion leading, a valve located within said pipe, means tending to hold said valve closed, and cam means for opening said valve when said discharge mouth is adjacent its lowest position.

' In testimony that I claim the foregoing I have hereunto set my hand at Manitowoc in the county of Manitowoc and State of Wisconsin.

ROLAND E. MINOGUE.

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