US1140719A

US1140719A - Downdraft continuous kiln.

Info

Publication number: US1140719A
Application number: US69455112A
Authority: US
Inventors: Frances D Shaw
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-05-01
Filing date: 1912-05-01
Publication date: 1915-05-25
Anticipated expiration: 1932-05-25

Description

F. 0. SHAW.

DOWN DRAFT CONTINUOUS KlLN.

APPLICATION FILED MAY I, I912. 1,140,719. Patented May 25, 1915.

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, v Frances am F. D. SHAW.

DOWN DRAFT CONTINUOUS KILN.

APPLICATION FILED MAY 1, 1912.

1, 140,7 1 9". Patented May 25, 1915.

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F. D. SHAW.

DOWN DRAFT CONTINUOUS KILN. APPLlcAflou FILED MAY 1, 1912.

1,140,719. Patented May 25,1915.

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w h! MIJM lllMlm h MUM ALLLOPHQt/J FRANCES ID. SHAW, OF CHICAGO, ILLINOIS.

nownnnnrr con'rmuous KILN.

Specification of Letters Patent.

Patented May 25, 1915.

Application filed May l, 1912. Serial No. 694,551.

To all whom; it may concern k Be it known that I, FRANCES D. SHAW, a citizen of the United States, residing at v Chicago, in the county of Cook and State of Illinois, have invented certain'new and useful Improvements in Downdraft Continuous Kilns, of which the following is a full,

clear, concise, and exact description, referthat the burning gases are projected against the articles to be burned in the kiln with as little loss of heat as possible, and the gases thus projected into the kiln are distributed over a large area, so that their efiect may be asefiicient as, possible and at the same time overheating of the articles in the kiln may be avoided. By my invention I also provide a construction by which the joints between the cars passing through the kiln and the walls of the kiln are more effectively sealed than heretofore and, in addition to this, by my construction improved sealing devices are provided between the ends of the cars so that the joints between them are effectively'sealed to prevent the escape of the hot gases through said joints.

My invention also relates to a novel construction of outlet flue from the kiln b which the stack is disposed over a section 0 the kiln with which the stack is not in any way in communication.

The several draw ngs illustrating my invention are as follows:

Figure 1 shows diagrammatically in plan view the arrangement of my improved kiln construction. Fig. 2 shows in vertical sectional view, taken along the line 2-2 in Fig. 1, a portion of the delivery end of the kiln. Fig. 3 is a transverse sectional view of the kiln taken through the heating chamber, such view being taken along the line 3--3 in Fig. 5 and showing the construction of fuel burners employed. Fig. 4 is a side elevation ofa portion of the burning chamber of the kiln. Fig. 5 is a vertical sectional view of the burnig chamber of the kiln taken along the line 5-5 in Fig. 3. Fig. 6

is a detail View showing the means employed to seal the openings between the ends of the cars. Fig. 7 is a detail view showing the means employed to seal the joints between the cars and the'walls of the kiln.

Similar numerals refer to similar parts throughout the several views.

As shown in Fig. 1, the kiln 1 consists essentlally of along tunnel-like construction of masonry, lined with fire brick to withstand the high heat to which it must be sub ected, which is provided at the lefthand end with a gate 2 and at the righthand end with a gate 3 to close the ends of the kiln while articles to be burned are passed therethrough by the operation of the cable 4 surrounding sheaths 5' and 6. The sheath 5 is driven by a shaft 7 through 00- operating gears 8 and 9 by means of an engine 10; The burning gases introduced into the kiln in a manner to be described pass therefrom under the damper 11 and out of the kiln through a stack 12.

As shown in Figs. 2 and 3, the substructure of the kiln consists of a number of masonry piers 13 upon which are supported channel beams 14, so disposed that their flanges extend upwardly to receive and support, the brickwork 15 forming the side walls of the kiln.. The kiln is inclosed at its top by means of an arch 16, in which are located, at intervals, fuel burners 17 designed to burn liquid fuel andso located that the heat resulting from their operation is projected downward upon the brick 18 or thereby through the burning chamber of the kiln. Fuel oil is supplied to the burner 17, by a pipe 20, through a valve 21, and in the burner itself a needle valve controlled by the handle 22 is provided, so that the flow of fuel may be regulated to exactly the amount required for the desired conditions of operation of the kiln. ,The shell of the burner 17 surrounding the fuel noz- 219 is supplied with steam by a pipe 23 which is controlled by a valve 24, so that the amount of fuel and the intensity of blast may be regulated as desired. The fuel pipe 20 and the steam pipe 23 are connected with

supply pipes

25 and 26, respectively, which extend longitudinally along the outside of the kiln. Burners 17 are distributed over the entire burning section 'or combustion chamber of the kiln and near enough together so that the intensity of the combusother articles carried by cars 19 and moved 30 so as to nearly, but not quite, engage the tion at any one burner need not be so great as to excessively heat the articles 18 passing through the kiln. Furthermore, the adjustment of the burners may be graded so that for conditions requiring a great amount of heat at one portion of the burning chamber than is required at another portion, this effect may readily be secured.

A great advantage secured by placing the burners in the arch 16, so that they project the burning gases downward, is that the hot gases are projected downwardly between the piles of brick carried by the cars 19 and, thus, the lowermost brick are burned at the same time that the burning action is begun in connection with the top brick upon the cars. Kiln flues 27 extend through the side walls of the kiln to prevent the brickwork being overheated in a manner to discars 19. These cars run on tracks 32 supported by the masonry piers 13, over a well or pit 33 provided for ready access to the under side of the cars if repairs are needed or to adjust the cable driving mechanism. "The bottoms of the cars are extended as shown at 34 under the inwardly extending edges of the inner channel beams 14, and angle bars 35 are used to relnforce and secure the parts in the, position indicated. The angle bars 35 carry upon their upper surfaces, as indicated more clearly in Fig. 7,

tubular sealing members 36 which may c0n-' sist of canvas hose or any similar material that is sufliciently resilient to yield upon engagmg the under surface of the channel beams 14 so as to prevent cold air from.

rushing into the combustion chamber from the pit 33. Each car carries a cam mechanism 37, operated by a lever 38, for engaging the driving cable 4 to clamp it between the cam 37 and the bracket 39 rigidly' mounted upon-the under side of the car so that the ears may bedrawn througlf the.

kiln. Each car is provided at its end, as more clearly shown in Fig. 6, with a downwardlv projecting flap 40 of sealing material, which is sufliciently resilient so as-to be slightly compressed when engaged by the projecting plate 41 extending from the under side of the opposite end of the adjacent car. Fabric as canvas may be employed for the flaps 40 and, as a result of the construction described, when the. cars are brought sufiicientlyclose together so that they constitute a train for moving the articles through the kiln, the flaps40 are engaged by the plates 41 and pressed upward against the under side of the car. bottoms in the position indicated in Fig. 2.

The section of the kiln between its delivery end and the end of the burning chamber adjacent thereto is built up of solid brickwork, as indicated at 42 in Fig. 2, said brickwork being supported by a continuation of the arch 16. -At a point near the delivery end of the kiln, but somewhat removed therefrom, the arch 16 is interrupted and a delivery flue 43 is formed through it, which extends upward and then horizontally through the damper 11 over the arch 16 extending from the flue 43 to the delivery end 45 of the kiln. The flue 43 terminates beneath the stack 12,'as a result of which the products of combustion may pass freely through the flue 43 overthe' end of the arch 16 and up through the stack 46 when the damper 44 is raised. The construc: tion, however, is such that any solid particles carried up with the gases discharged through the flue 43, together with any foreign matter which may be thrown into the stack 46 from the outside do not drop I upon the cars or their contents, but, on the other hand, are deposited upon the top of the arch 16 from which they may be removed when the kiln is cleaned. The damper 11 is supported in end guides 47 and provided with housing cables or similar devices 48, extending from the damper 11 to a drum 49 mounted on a shaft 50, which shaft is supported in'bearings 51 and rotated byvmeans of a crank 52. A pawl 53 engages a ratchet wheel -54 formed on the drum 49,.so as to hold the damper inany position to which it may be moved.

While I have shown my invention inth particular embodiment herein described, I do not, however, limit myself to its construction, as I may employ equivalent arrange ments without departing from thespirit of my invention.

What I claim is: 1. In a continuous kiln, the combination of a masonry tunnel, cars for closing the bottom of the tunnel, ledges projecting inward from the side wallsof the tunnel into rabbets formed in'the cars'to receive the same, projecting flangesextending from the cars below the side walls of the tunnel, and resilient sealing devices between and the bottom of said sidewalls.

2. In a continuous kiln, the combination of a masonry tunnel, cars for closing the lit the flanges 5 bottomof the tunnel, the side walls of the tunnel and the edges of the cars-being conformed to cooperate to form a broken sur-. face to prevent the ready passage of gases therethrough, and resilient sealing devices betweenthe cars and the side walls of'the tunnel along the lower portion of the broken surfaces.

3. As a means for sealing the bottom of a continuous kiln, a plurality of cars for carrying articles to be burned through the kiln, a flap of resilient material extending downward transversely of the car at one end of each of said cars, and a plate carried by the other end of each of said cars for engaging one of said flaps to press it between the plate and the bottom of the car to which it is secured.

4. As a means for sealing the bottom of a continuous kiln, a plurality of cars having 15 their sides of irregular conformation to cooperate with similar irregularities formed in the kiln, and resilient sealing material carried by the sides of the cars near the bottoms thereof for engaging the bottom por- 20 tion of the kiln.

In witness whereof, I hereunto subscribe my name this 19th day of March, 1912.

FRANCES D. SHAW. Witnesses:

LEONARD W. NovANDER, ALBERT C. BELL.