US1184690A - Hot-blast stove. - Google Patents

Description

-K. L. LANDGREBE.

HOT BLAST STOVE.

APPLICATION FILED NOV. 5. INS.

LJLMfiQQ. Patented May 23,1916.

2 SHEETS-SHEET 1- K. L. LANDGREBE.

HOT BLAST-STOVE. APPLICATION FILED MW. s. 1915.

11 11. GQQ. Patented May 23,1916,

2 SHEETS-SHEET 2.

s ra rns Para amen.

HOT-BLAST srovn.

Specification of Letters Patent.

Patented May 23., 1916.

Application filed November 5, 1915. Serial No. 59,756.

To all whom, it may concern Be it known that I, KARL L. LANDGREBE, a citizen of the United States, and a resident of Ensley, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Hot-Blast Stoves, of which the following is a specification.

The present type of stove consists of a single shell havin within it the combustion chamber and heating chambers, the heating chamber being filled with checkerwork and the combustion chamber being unobstructed.

The object of hot blast stoves is to heat air forced through the same for use in blast furnaces and the like. The checkers are heated by means of gas from the blast furnace and air combining in the combustion chamber and being. drawn or forced through the checkers, thereby heating them. When sufiiciently heated, air is forced through said heated checkers, absorbs heat therefrom and is directed through the combustion chamher into the blast furnace.

In the present type of stove great difficulty is experienced in the burning through of the walls. of the combustion chamber, thereby harming the checkers in the heatingchamber, necessitating shutting down the stove for repairs. As ittakes a long time for the checkers to cool sufliciently to permit men to enter the stove to make repairs, a great amount of time is lost, as the heating chamber cools much more slowly than the combustion chamber.

The object of my invention is to provide an arrangement which makes this stove a one-pass stove as compared with the two, three and four pass stoves which are in use at the present time. The advantages can be readily seen that the gas burned in the combustion chamber is led directly into the checkerwork and after heating the same, the waste gases are exhausted by a stack on the top of each individual stove, the same as the present three-pass stove. After the stove is heated, the air from the blowing engines to be heated is passed down through the .-.checkerwork, thence through the combustion chamber, which is attached by connections below the arches sustaining such checkerwork, and thence by a hot blast connection to the furnace.

Another feature of this stove is the preheating of air used for the combustion of gases by absorbing the heat of radiation from the firebrick walls of the combustion chamber and the connections joining the combustion chamber with the stove proper.

Air for this purpose may be drawnthrough the annular space surrounding the shell of the combustion chamber and connections, by the natural draft of the stove as shown, or the air may be forced in by air from the cold blast main or fan blast. The preheating chamber is made by building a steel plate jacket around the shell of combustion cham her and connections with a further connection from this chamber direct to the gas burner.

Attention is also called to the arrangement of the firebrick piers supporting the arches which hold the checkerwork. These piers are so arranged that ample alleyways are formed for the perfect distribution of the gases as they come from the five connections leading from combustion chamber to stove proper. The combustion chamber is built of suflicient height so that the full flame reaction, which takes place in the burning of the gases, will take place in the chamber and ways, and I consider any modification 'of a separate combustion chamber and a heating chamber connected 1n any manner with the bottom or side of stove or heating chamber and which allows the incoming gases to pass around piers and arches underneath the checkerwork and up through same as coming within the scope of my claims and the spirit of my invention.

The invention will be more readily understood by reference to the accompanying drawings, wherein Figure 1 is a vertical section through a hot blast stove constructed in accordance with my invention; Fig. 2 is a section on the irregular line 2-2 of Fig. 1, and Fig. 3 is a plan view of the tier and coluinn construction by means of which the stove is supported.

As shown in the drawings, the stove may be of usual construction comprising an inner brick lining 10, an outer metal shell 1'1, and checkerwork 12. Projecting axially from the upper end of the stove is the chimney 13. Likewise, in the upper end of the stove, an entrance is provided from the cold blast main 14, the entrance being through the elbow 15 and the valve 14*. The checker work is supported on suitable arches 17 and the piers 18, the piers being so located as to provide for the fullest disposition of the heated gases from the combustion chamber. The piers 18 rest upon the bottom of the stove which is supported by structural work 19, which, in turn, is supported by the columns 20, best shown in 3. The upper edge of the structural work is located at the floor line, which is indicated at 21. The advantageous result vained by this construction is inthat all of the combustion chamher and connections are beneath the floor line, thus economizing on space and making a much neatei' arrangement.

The combustion chamber is indicated at 22, and is located axially of the stove, connections being provided to the spaces or alleys 23 between the piers by means of an axial outlet 24 and four diagonally disposed conduits 25, the latter communicating with the sides of the stove and, consequently, the outermost of the alleys 23. Gas is supplied through the main 26, from which it is piped to the burner 27, where it is mixed with air drawn in from around the combustion chamber and connections. To accomplish this result, it will be noted that I have provided a secondary shell 28 for the combustion chamber and connections, an opening 29 being left through which the air enters. It will be seen, therefore, that the heat radi ated from the combustion chamber is utilized to preheat the air used in combustion. The hot blast main is indicated at 30 and communicates with the combustion chamber by a conduit 31 controlled by valve 32.

The operation is as follows: Gas being admitted from the main 26, combustion is started in the burner27, being completed in the combustion chamber 22. The heated products of combustion pass upward through the connections 24, 25 into the alleys 23, at which point they are fully distributed over the checkerwork. After passing through the checkerwork, the gases escape through the chimney 13. When the stove is to be reversed, the gas is shut off, the cold blast valve 14 is opened, the hot blast valve 32 likewise opened, and the chimney valve 16 is closed, whereupon the air from the cold blast main is forced through thestove on its way to the blast furnaces. An important advantage gained bythe 'use of the construction. shown is in that there is a direct pull on the gases by the stack resulting in a much freer flow through the stove. A result of such construction is that the time required to heat the stove will be shortened materially.

I claim:

1. In a hot blast stove, the combination of a shell, checkerwork within the shell,

arches supporting said checkerwork and piers supporting said arches, and a combustion chamber located beneath said piers and communicating with the space around said located axially beneath said stove and con-' duits connecting said combustion chamber with said stove at the axis thereof and at a plurality of points at the periphery of the stove, substantially as described.

3. In a hot blast stove, the combination of a shell, checkerwork, piers and arches supporting said checkerwork, a structural framework upon which said piers are built and columns supporting said framework, said framework being located at substantially the floor line, and a combustion chamber located beneath the floor line, substantially as described.

4. In a hot blast stove, the combination of a shell, checkerwork, piers supporting said checkerwork and providing a plurality of alleys underlying the entire body of the checkers, a combustion chamber and com duits providing communication between said combustion chamber and said alleys, one of said conduits being located axially of the stove and others of said conduits extending radially from the stove, substantially as described.

5. In a hot blast stove, the combination of a shell, checkerwork, piers supporting said checkerwork and providing a plurality of alleys disposed beneath the body-of the checkers, a combustion chamber located axially below said checkers and providing communication with the checkers axially and at points near the periphery of the stove, substantially as described.

6. In a one pass hot blast stove, the combination of a shell, checkerwork filling said shell, a stack outlet and a cold blast inlet being provided at the top of the stove, and a hot blast outlet, a combustion chamber and a burner at the bottom of the stove, said combustion chamber being located axially of the stove, and means for distributmg the heat from said burner to all portions of said checkerwork, substantially asde-- scribed.

'7. In a hot blast stove, the combination of a shell, checkerwork within the shell, the checkerwork being located above the floorline, a combustion chamber axially ar ranged with relation to said shell and located beneath the floor-line, a burner connected to said chamber, and means for dis- 8. In a one pass hot blast stove, the combination of .a shell having an axial opening at either end, checkerwork Within said shell, said checkerwork filling the shell at all points in its cross sectional area, a combustion chamber located in line With the axial bottom outlet from said shell, a burner connected to Said chamber, and a plurality of flues projecting radially from said shell at the lower end thereof and communicating with said chamber, substantially as described.

9. In a hot blast stove, the combination of a shell, checkerwork and a combustion chamber, said combustion chamber being separate from said shell, said checkerwork being positioned above the floor line of the stove, said combustion chamber being positioned axially of the stove and beneath the floor line, and connections between said combustion chamber and said stove, substantially as described.

Signed at Ensley, Alabama, this 19th day of October, 1915.

KARL L. LANDGREBE.

Witnesses:

E. K. MILLER, JAMEs P. DOYLE.

\ Copies of this patent may be obtained for five cents each, by addressing the "Gommissloner of Patents,

Washington, D. 0.

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