US1689042A - Hot-blast stove - Google Patents

Description

Oct. 23, 1928. 1,689,042

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Oct. 23, 1928.

F. R. M GEE HOT BLAST STOVE Filed Aug. 9, 1926 2 Sheets-Sheet 2 it s FRANK B. MCGEE, 0F STEUIBENVILLE, OHIO.

HOT-BLAST STOVE.

Application filed August 9, 1926. Serial No. 128,251.

This invention relates to hot air blast stoves tor use in heating the hot blast for blast furnaces, and has for one of its objects the provision of an improved form of single pass stove having an improved chcckerwork therein to increase its efiiciency.

Another object is to provide a stove of a U- shape whereby the working ends are both at the top and all underground flues, dampers, valves and other parts are eliminated.

Another object is to provide a stove in which the checker-work is supported directly on the shell, thereby eliminating the necessity for supporting arches, pillars, etc, as constructed in the forms of stoves now generally in use.

A further object is to provide a stove from which the dust may be removed while the stove is in operation by workmen above the ground level.

A still further object is to provide a stove having the novel construction, design and combination of parts hereinafter described and illustrated in the accompanying drawings.

' In the drawings:

Figure 1 is a sectional elevation through a stove constructed in accordance with this invention.

Figure 2 is an enlarged sectional plan on the line 11-11 of Figure'l.

Figure-3 is an enlarged sectional elevation on the lineIH-lll otFigure 2, showing the H checker wall construction.

Figure 4; is a similar view on the line IV-lV of Figure 2.

Referring more particularly to the drawings, the lette A designates the U-shaped enclosing wall or shell of the single pass stove of this invention as a whole, which is composed of a steel jacket 2, a-silocel or other insulating lining 3,- and a brick wall 4. The upper ends of the U-shaped shell are frusto-conical in shape and form combined distributing and collecting chambers 5 and 6 for the gases passing through the stove. Y I

The chamber 5 has its reduced upper end connected directly with an air preheater 7 in which an induced draft fan 8 is mounted. The preheater 7 connects with a gas preheater 9 which in turn is connected to a stack 10, so that the products of combustion are drawn through the stove by the fan 8 and forced thrhugh the preheaters 7 and 9 and then into the stack 10.

A gas main 12 is connected to the preheater 9 and a gas conduit 13 leads from the preheate119 to a gas burner 14 communicating at 15 with the collecting and distributing chamber 6. An air supply conduit 15 leads from the air preheater 7 to the burner 14 to supply heated air for supporting combustion.

A hot blast main 16 is connected with the upper end of the chamber 6 by a conduit 17, and a cold blast main 18 is connected by a conduit 19 to the upper end of the chamber 5.

A working platform 20 is supportedacross the upper ends of the stove, so that the workmen may have ready access to the several parts of the apparatus.

Suitable valves of any Well known and accepted design may be provided for controlling the flow of gas and air to and from the stove. A. valve 21 is provided in the gas sup-ply conduit 13, and a valve 22 is provided in the air supply conduit 15, and valves 23 and 24 are provided in the conduits 17 and 19 leading from the hot and cold blast Ina-ins, respectively.

A novel form of checkerwork B is mounted form one fourth of a circular recess or opening 29 formed by the abutting corners of four adjoining bricks. 'lhe recesses or openings 29 are adapted to receive the reduced ends of combined spacing and bafile bricks or tiles 30, which are built into and extend from one wall 25 to the next wall transversely of the gas channels 27.

The bricks or tiles 25 are each provided with a centrally arranged circular opening 31, which openings in each of the several walls are preferably in alinement so as to form transverse gas passageways between the several gas channels 4, thus permitting a trans,- verse flow of gases to. equalize the flow and priissure of the gases in'each of the gas channe s.

The construction of the checkerwork B prevents the t'orming of dead or cool areas due to the transverse gas flow between the gas chan nels, and also is 'more eflicient than checkerwork as heretofore generally constructed, since there is less surface upon which dust may collect.

The frusto-conical shaped distributing and collecting chambers 5 and (Shaw aventuri-like etlecton the gases or air entering the stove and thereby cause an equal distribution over the entire checkerwork. However, if for any reason the gas channels 27 did not all receive an equal supply of gas or air,'the openings 31 would cause the gases or air to flow transversely into the channels having the lesser volume. I

The novel stove and checker construction eliminates the necessity for the use of supporting arches, pillars, flues etc., and, therefore, is materially cheaper to build.

By admitting the cold air to be heated at the stock end of the stove and causing it to pass out of the burner end, a greater efliciency is had since the air passes over the hottest checkerwork after it has been preheated.

The shell or enclosing wall A of the stove is provided with a plurality of cleaii-out or dust-removal openings 35, two of which communicate with each of the gas channels 27 and are closed by doors 36. The major portion of the dust will settle into the bottom of the gas channels 27, and the remainder which.

adheres to the checkerwork will be blown or otherwise caused to fall down into the lower end of the gas channels, where it may be readily cleaned out through'the openings 35.

While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited thereto, since various modifications may be madewithout departing from the scope of my invention as defined in the appended claims.

Iclaim:

1. A single pass hot blast stove comprising asubstantially U-shaped shell having frusto-conical end portions, a checkerwork built in said shell and terminating short of each end, the frusto-conical spaces at each end forming distributing and collecting chambers for the gases passing through said checkerwork.

2. A single pass hot blast stove comprising a substantially U-shaped shell having frustoconical end portions forming distributing and collecting chambers for the gases, a checkerwork built in said shell and tenninating short of said frusto-conical ends, a gas burner communicating with one end, a hot blast main communicating with said end,

a stack communicating with the other end,

a cold blast main. communicating with said other end, and valves controlling the operation of said gas burner and the flow of air from said cold blast main and to said hot burner and the flow of air from said cold blastma-in and to said hot blast main.

4. A single pass hot blast stove comprising a substantially U-shaped shell having frustoconical end portions forming Venturi-like distributing and collecting chambers for the gases, a checkerwork built in said shell and terminating'short of said frusto-conical ends, a gas burner communicating with one end, a hot blast main communicating with said end, a stack communicating with the other end, a cold blast main communicating with said other end, and valves controllingthe operation of said gas burner and the flow of'air from said cold blast main and to said hot blast main.

5. A single pass hot blast stove comprising a vertically disposed U-shaped shell having frusto-conical end portions formingVenturilike distributing and collecting chambers, a checkerwork built in said shell below said chambers, a source of heat communicating with the upper end of one of said chambers, a hot-blast main communicating with said chamber, an induced draft fan communicatingwith the other chamber, a cold blast main communicating with said other chamber, said Venturi-likechambers being adapted to cause an even distribution of heated gases and draft in said checkerwork.

6. A single pass hot blast stove comprising a shell having end portions forming distributing and collecting chambers for the gases, at least one of said end portions being frustoconical in shape, a checkerwork built in said shell and terminating short of said ends, a gas burner communicating with said frustoconical end portion, a hot blast main communicating with said end, a stack communieating with the other end, a cold blast main communicating with said other end, and valves controlling the operation of said. gas burner-and the flow of air from said cold blast main to said hot blast main. 1

In testimony whereof, I have hereunto set my hand.

FRANK ll. McGlClC.

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