US2002972A - Apparatus for making portland cement - Google Patents

Description

May 28, 1935.

T. AVNSOE APPARATUS FOR MAKING PORTLAND CEMENT 2 Sheets-Sheet 1 Original Filed Dec. 26, 1951 I Illll x. A. N

lNVENTOR Torki/d Amsoe ATTORNEY 2 Sheets-Sheet 2 May 28, 1935. 'r. AvNsoE APPARATUS FOR MAKING PORTLAND CEMENT w MMW K n M L .H I w z i E o W M m f Original Filed Dec. 26, 1931 Patented May 28, 1935 UNITED STATES I 2,002,912 PATENT OFFICE APPARATUS FOR MAKING CEMENT Thorkild A'vnsoe, Bellerose, N. Y., assignor to Intel-national, Cement Corporation, New York,

N. Y., a. corporation of Maine Original application December as, 1931, Serial No. 583,268. Divided and this application December '29, 1932, Serial No. 649,253

I 6 Claims. This application is a division of Serial No. 583,268, flled December 26, 1931, by Harvey Randolph Durbin and myself.

This invention relates to an improved apparatus for introducing into a kiln materials to be treated therein, which apparatus is particularly suited for cement kilns or the like where hot gases are encountered. An object of the invention resides in the provision of an improved construction whereby the mix may be introduced into an ordinary rotary kiln through openings in the wall thereof and at the desired point, andreadily adaptable to permit operation of the kiln when the material is introduced above said openings. I

In connection with a. more detailed description of the invention, reference will be had to the accompanying drawings, wherein: Fig. 1 is a diagrammatic side view of a kiln in accordance with the present invention, showing means, partly in section, for introducing Portland cement mix into the kiln.

Fig. 2 is an enlarged transverse section of the construction shown in Fig. 1, taken through the means for introducing the mix. A

Fig. 3 is a. fractional side elevation showing the means carried by the kiln for introducing the mix into the latter. Q

Fig. 4 is an enlarged central, cross-sectional view of means for detachably securing to the kiln the tubes for introducing the mix thereinto.

Fig. 5 is a transverse section taken on the line 5-5 of Fig. 4.

Figs. 6 and 7 are views similar to Figs. 4 and 5, respectively, but showing the kiln with the tube removed and means in place for closing an opening in the kiln.

Referring now to the drawings, there is shown at i a rotary kiln adapted to the burning of mixtures of the material to be combined to form at 31: from a gas, oil, or coal'burner. There is shown generally at 4 in 'Fig. 1 means for introducing the mix for the second burning in accordance with the present process. This means consists of a hopper 5 into which the mixture of lime and once burned cement 6 may be fed through any suitable screw conveyor, or the like,

for instance, as shown at 1*. This hopper may be closed at the top by a roof 8 which may extend over the kiln. In order to pick up the material from the hopper andfeed it into the kiln, the latter may be-provided as shown with a series of tubes ID, the outer ends ll of which are adapted to scoop up quantities of the mix as the kiln revolves, while the inner ends of thesetubes 12 extend through the side wall of the kiln and enter the interior thereof.

In order to avoid the danger of back-firing,

and loss of heat from the kiln into the hopper, on account of the difference in temperature between the interior of the kiln and the hopper, we prefer to make these tubes ill of such length that there is always suflicient material in each tube during the operation of the kiln in carrying out the second burning to prevent back-firing and back pressure. In this manner, before one quantity of mix, has entirely passed through a given tube In into the interior of the kiln, the

other end of the tube is picking up another portion of the mix. For this purpose, it is advantageous to have the tubes generally circular or, in other words, with their inner and outer ends l2 and H located about 360 apart. However, depending on how much material is generally taken in by the tube at each revolution, the tubes may be somewhat shorter or longer. While any desired number of tubes of this character may be employed, four are shown in Fig. 2, supported on the kiln through any suitable hangers l3, l3.

In order that the kiln may be used intermittently for the first and second burning operations, it may be provided with removable tubes Ill or with removable connecting sections as shown in Figs. 4-7. For instance, thekiln outer metal wall, shown at .20, has a lining 2| of refractory material which is secured to the wall 20 in any suitable manner. An opening 22 is formed both through the refractory material and the outer wall, but the outer wall may advantageously extend partly over the opening in the refractory material, for purposes hereafter indicated. Hollow castings 23 having flanges 2 are secured to the wall of the kiln and pass through and fill the hole in the refractory material. The connecting section l2 of the tube It! has a flange l3a which may be integral with the corresponding flange on the mainbody of the tube it or detachable therefrom and held by bolts or other suitable clamping means. This tube i2 is curved to extend from a direction generally parallel to the circumference of the kiln, into the opening in the casting 23 and to communicate with the interior of the kiln. The tube It isprovided with a rim 25 for engaging the outer sides of the wall of the kiln around the opening 22, to form a tight closure. A lug 21, which may be beveled out to receive the tube I2, is provided on the kiln for positioning the rim 25. A lug 26 is formed on the rim 25 and a surface 29 is provided to abut against the edge of the wall 20. For maintaining the tube end l2 in engagement with the walls of the kiln, the lug 26 is provided with a surface, 30 against which there seats a securing bolt 3| threaded in a yoke 32, the ends 33 of the yoke engaging suitable eyes 34 carried by the kiln.

When it is desired to remove the tube connection l2 from the kiln, the bolt 3| is unscrewed, the clamps or boltsare removed from .the flange lia, and the yoke 32 is removed. The tube may then be turned and slipped out through the opening in the casting 23. The opening may be closed by means of blocks 36 and 31 of refractory material, having shouldered portions 38 for engaging the flanges 24. The block 36 may be slipped in place first between the projecting wall of the kiln and the supporting shoulder or flange 24, and thereafter the block 31 may be inserted as illustrated. A wall section 39 may then be applied to the construction as shown in Fig. 6, and bolted in place through the yoke and bolt construction described, the bolt 3| bearing upon a strip 40 on the plate 4| which covers the hole in the kiln wall and extends beneath the pro- .iection 42 of the lug 21. with this arrangement the connecting section [2 may be removed without removing the tubes ill from the surface of the kiln. If desired, however, the tubes 10 may be made in sections and may be also removed at the same time.

In the manufacture of ordinary Portland cement, it will be understood that the mix may be introduced into the right hand end of the kiln as shown in Fig. 1 '(the openings 22 being closed) and fed therethrough at a suitable rate, while a heated gaseous medium is introduced in the other end of the kiln and passed therethrough in countercurrent relation to the passage of the mix to calclne and burn the cement mixture in a manner well known in the produc-. tion of once burned cement. The once burned Portland cement as it leaves the kiln, may contain excess lime over that which combines with the silica, alumina and ferrite compounds in the first passage through the kiln, or additional lime may be added to it. The mixture is ground and may then be submitted to the second burning, for which operation the same kiln with the tubes In in place may be employed.

It will be appreciated that one of the advantages of the present invention resides in the fact that kilns which are already in operation for the burning of cement may be employed in the present simple and advantageous manner for carrying out a process involving double burning. In other words, the usual long kiln may be op erated by feeding the initial mix adapted to form ordinary Portland cement into the up rend of the kiln and conducting the heating d burning in the usual manner. The product thus obtained may be treated according to the disclosure in' the Durbin Patents Nos. 1,700,032 and 1,700,033' and then returned to the same kiln, at the point indicated for the introduction of the mix for the second burning operation, after the material to be initially burned has all passed through.

While my apparatus has-been described in connection with cement kilns its use is not so restricted for it may be employed for other purposes.

The terms and expressions which I have employed are used as terms of description and not of limitation and I have no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described, or portions thereof, but recognize that various modifications are possible within the scope of the invention claimed.

I claim:

1. An apparatus of the type defined, comprising a kiln with a metal shell and a refractory lining, an opening in said shell registering with an overlapping portion of an opening in said refractory lining, a flanged hollow member fixed to the inner surface of said shell and oiIset from a portion of the opening in the shell, a feed pipe flxed to the outer surface of said shell and a removable connection between one end of said pipe and the kiln, said connection being adapted to pass through the registering portions of said openings, and means for retaining said removable connection upon the shell.

2. In an apparatus of the type described, a kiln having a metal shell with an aperture therein and a refractory lining having an aperture which overlaps the aperture in said shell, an annular member adapted to flt snugly within the aperture in said refractory lining and having a flange adapted to support a removable piece of refractory material, a removable feed pipe connection adapted to extend into the overlapping portions of said apertures, said connection hav- 3. In an apparatus as defined in claim 2, the

means adapted to retain the connection or closure plate comprising a lug adapted to receive a portion of the flange of the connection or a portion of the cover plate and a clamp adapted to bear upon the side of said connection or cover plate opposite said lug.

4. An apparatus of the type described, comprising a kiln having a metal shell and a refractory lining, an opening extending through said shell and lining, a feed pipe fixed to the outer mace of said shell and a removable connection between one end of said pipe and the kiln, said connection being shaped to extend through the openings in said shell and refractory lining and having a flange adapted to bear upon the outer surface of the kiln and to close the opening therein, and clamping means for retaining the said flange against the kiln surface.

5. An apparatus as defined in claim 4, in which the shell of the kiln is provided with a raised flange and the removable connection is provided with a lug adapted to fit thereunder.

'5'. Arr-apparatus as defined in claim.4, in which theshell of the kiln is provided with a raised flange and the removable connection is provided with a lug adapted to flt thereunder and the clamping means comprises a saddle having its ends positioned in members fixed to the kiln and having a clamping bolt extending through it and bearing upon a portion of the removable con-

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