US1988798A

US1988798A - Manufacture of cement

Info

Publication number: US1988798A
Application number: US715264A
Authority: US
Inventors: Vogel-Jorgensen Mikael
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1933-07-25
Filing date: 1934-03-13
Publication date: 1935-01-22
Anticipated expiration: 1952-01-22

Description

11.935- M. VOGEL-JORGENSEN 8 r MANUFACTURE OF CEMENT Filed March '13, 1934 INVENTOR Isl 07% Pirated Jam-22, 1935 I MANUFACTURE or CEMENT Mikael Vogel-Jorgensen, Copenhagen, Denmark, assignor to F. L. Smidth & 00., New York, N. Y., a corporation of New Jersey Application March 13, 1934, Serial No. 715,264 In Great Britain July 25, 1933 1 Claim.

In the trea'ment of cement material, preliminary to the sintering of the same in'kilns, it has been proposed heretofore to permit the raw material, in the form of nodules or granules, to pass 5 between two vertical louvers through the openuniformity in the ultimate product it is desirable that the material iedto the space between the louvers at'its top and descending between them shall move constantly at a uniform rate. In the practical useof such apparatus it has been found that there is a tendency of the material, which necessarily is slightly moist; to form a coating, especially on the upper plates of that louver between the plates of which the hot gases pass after they have passed through the material, which coating increases in thickness and eventually interferes with the free movement of the material and therefore afiects unfavorably the quality of the ultimate product. In another application oi the present applicant, Serial No. 696,305 filed November 2, 1933, there is shown and described an apparatus, such as that referred to, in which' it was sought to secure uniformity in the movement of the material between the two louvers by giving the louver plates, on their opposed working faces, a certain formation and also by giving such plates a short reciprocatory movement in a generally vertical direction. In the continued use of that apparatus it has appeared-that the coat ing of the louver plates with the material is due in part at least to the lack of evaporation'of the moisture content of the nodules, the plates, and particularly the upper plates of the louver remote from the kiln, being relatively cool so that there is little or no evaporation of the contained moisture in the nodules. In the development of the present invention it has been found that evaporation of the contained moisture in the nodules can be promoted sufllciently to prevent the coating of the louver plates with which the material comes in contact and particularly the uppermost plates or the louver remote from the kiln by heating the platessomewhat, particularly as to their working faces, and in accordance with the invention provision is made whereby hot gases from the kiln .or other heating medium are caused to pass in contact with the uppermost louver plates, which otherwise would not be heated sufllciently. In

the case of the uppermost plates oi the louver remote from the kiln there would be but little contact with the hot gases before they passed to the stack. It has been found desirable to make such plates hollow and to provide means whereby hot gases from thekiln or other heating medium are caused to pass, on their way-to the stack, between the two walls of each hollow plate.

The invention will be more fully explained hereinafter with reference to the accompanying drawing, the single figure of which is a view in vertical section of the improved structure, a portion-oi a rotary kiln being also shown.

In the embodiment of the invention illustrated the hot gases from the kiln 1 pass into a chamher 2 wherein is erected a double louveriorming a partition between the plates 3, 4--of which the material, delivered through a hopper 2, descends by gravity passing from the double louver upon a plate 2 from which it may be discharged by a reciprocating pusher 5 upon a chute 2 by which it is directed into the kiln. The louver plates 3,

4 maybe formed and arranged as shown and described in the application above mentioned.

In order that a current of hot'gases from the kiln l or other heating medium may be brought into contact with the uppermost plates oi. the double louver, and particularly with the uppermost plates of the louver wall remote from the kiln, there is provided in the upper part 01' the chamber on the near side of the double louver an opening 8 which is connected by a tube 8, shown in broken lines, with a header 8 which in turn is connected by distributor pipes 8 with the space between the walls of hollow louverplates -'7. The

hot gases are thus brought in contact with the walls, with the working faces of which the material is brought in contact as it descends and the hot gases, after having heated the plates, pass from the open lowerends of the spaces between the walls into the chamber on the remote side of the double louver and thence to the stack through an opening at 9.

It'has been found in practice that bysuch means the louver plates areheated sumciently to bring about such degree '0! evaporation of the moisture content of the material as to prevent a coating or the plates and thereby the movement I of the material downward between the louver walls continues unaffected by accumulation of material on the working faces of the louver plates.

While the present invention is shown and described as embodied in a structure which has the characteristics or some of the characteristics of the structure shown and described in the application above that the present invention is not restricted to use mentioned, it will be understood:

with that structure or to the particular construction and arrangement of parts shown and de-' scribed herein, except as pointed out in the accompanying claim.

I claim as my invention:

In a structure for the treatment of cement raw material with hot kiln gases, the combination of a chamber, a double louver forming a partition in the chamber, the chamber having an inlet on one side of the. double louver for the hot kiln gases and an outlet on the other side of the double louver for the escape of the gases and having also an opening on the side of the double louver nearest the inlet for the hot gases, one of the louver plates being hollow, a header in communication with the space between the walls of the hollow plate, a tube connecting said opening with said header, and means to supp y material to the space between the louvers at their upper MIKAEL VOGEL-JORGENSEN.