US1724848A - Hot-blast stove - Google Patents

Description

2 Sheets-Sheet Aug. 13, 1929. F. R. McGEE HOT BLAST sTOvE Filed Nov. 2, 1927 I Of l www@ Aug. 13,1929. F. R. McGEE HOT BLAST sTovE Filed NOV. 2, 1927 2 Sheets-Sheet ff//f mmm,

Patented Aug. 13, 1929.

UNITED -sTATEs FRANK B. MCGEE, F S'.lETBENVILLE,V OHIO.

HOT-BLAST STOVE.

Application led November 2, 1927. Serial 110,230,628.

This invention relates to hot blast stoves and, while not limited thereto, relates more particularly to sin le pass hot blast stoves, Aand has 'for its oject the provision of a stove of this class in which the checkerwork is self-supporting. That is, supported directly by the side walls of the stove without the use of arches or other supporting elements so as to permit the free circulation of air and gases over the entire lower face of the checkerwork. i

Another object is to provide a safety pier, spaced slightly below the checkerwork, for preventing the collapse of the checkerwork if the checkerwork fails for any reason after use.

Another object is to provide a combined baille and distributing member between the lower end of the checkerwork and the point of communication of the stack and cold blast main for preventing short-circuiting of the gases and air passing through the check` erwork.

In the drawlngs- Figure 1 is a side elevation, partly in section, of a hot blast stove constructed in accordance with my invention.

Figure 2 is a sectional elevation of the lower end 4of a slightly modified form of stove.

Figure 3 is a fragmentary sectional elevation of a portion of the checker-plug.

Figure 4 is a perspective view of one of the special bricks used to form the checkerp Rgeferring more particularly to the drawings, the letter A designates the cylindrical side wall of the stove which is composed of a metal shell 2 and a brick or other refractory lining 3. y

In the construction of the drawing the novel features of mystove are shown applied to an old stoveshell and, therefore, the lower portion of the shell is reenforced by an outer reenforcing ring 2". It will be understood,- however, that if an entire new stove was being constructed, the shell may be made heavier at the lower end if desired instead of using the reenforcing shell or ring 2a. A layer of insulating material 4 is provided between the bricks and the shell 2 above the reenforcing ring 2UL and between the shell 2 and the reenforcing ring 2f* to a rotoct the metal and prevent the escape of iieat from the stove.

The upper` end of the stove is formed conical and has a combustion chamber 5 formed thereon, which communicates through a conduit 6 with a hot blast main 7 and has a burner 8 mounted. on and` communicating through its upper end.

A self-supporting checkerwork B is built 1n the stove and extends entirely across the cross-sectional area of the stove and terminate short of each end thereof. The checkerwork B is composed of a checker-plug 10 at lts lower end and the standard or usual checkerwork 12 which is supported on the plug 10.

The checkerwork plug 10 is composed of a special hollow tile 13 'having its outer surfaceV roughened by transverse indentations or ribs 14. The tiles 13 are laid up, end for end, vertically so as to form vertical checker lines or passages 15 and are preferably laid up with a. high temperature cement having high refractory tensile and shearing values so" that the 'cement will ll the indentations 14; and combine with the tile surfaces so as to act as keys between the tiles and form a, monolithic whole. The passages or checker lues 15 in the checker-plug 10 are 1n l1ne and communicate with the vertical checker passages 16 in the checkerwork 12.

The spaces at each end of the-stove form distributing and receiving chambers 18 and 19 for the products of combustion or gases and the air passed or to be passed through f the checkerwork B.

The lower chamber` 19 is free of arches or other supporting members which are usually provided to support the checkerwork of the stove since the checker-plug'lO extends or bridges across the entire cross-section of the stove and is self-supporting. The lower 'safety pier 26 is built in the chamber 19 and provided with a cast iron cap piece 27 having transverse passages 28 therethrough and vertical perforations 29 communicating with the passanfes 28.

The upper face of the ca piece 27 is spaced a material distance beow the lower face of the checkerwork pluo' 10 and is provided to act as a support fbr the checkerwork in case the checkerwork should fail i after prolonged use or for any unforeseen reason. 'The vertical perforations in the cap piece 27 are in line wlth the vertical assages in the checkerwork so` that if the chec erworkslips or falls so as to rest on the cap piece the passages in the checkerwork will remain open and the efficiency of the stove will not be materially impaired.

In order to prevent short-circuiting of the ases and air and provide aneven or unifyorm flow through the entire checkerwork, a combined bale and distributing member 30, of generally frusto-conical or dish-shape formation is secured around the pier 26 at a point between the lower face of the checkerwork plug 10 and .the port 20.

The member 30 is vprovided with perforations 31 to permit -the passage of air and gas therethrough and is ofless diameter than the stove so that air and gas'may pass around the member. The member 30 serves to retard or baille theyflow of the air and gas and thereby cause the air entering from the cold blast main to spread out or distribute over the entire chamber 19 and enter all the passages of the checkerwork, and it serves to retard the flow of hot gases from the checkerwork and prevent such gases making a short circuit or cut to the port 20.

In Figure 2 I have shown a slightly modified form of stove. This modified form of stove is substantially the same as that of Figure 1 'except that the checkerwork plug 10 has its lower end arched as at 10a so as to increase the area of the lower distributing and collecting chamber and, theoretically, such a construction will be less liable to settle or fail in user In Figure 2 a modified form of combined baille and distributing member 30a is provided. 'Ihe member 30aL is of true frustoconical shape and is supported b a hollow metal pedestal or pier 30. The unction of the member 30a is the same as the bale and distributing member 30 of Figure 1.

While I have shown and described specific embodiments of my invention it will be understood that I do not wishto be limited thereto since various modifications may be made withoutdeparting from the scope of my invention, as defined in the appended claims.

I claim 1. A single pass hot blast stove comprising a lined shell, a checkerwork extending across the entire cross-sectional area of said stove and terminating short of each end of said shell so as to provide distributing and receiving chambers for the gases and air passing through said checkerwork, said checkerwork comprising a self-supporting plug portion bridged across the entire crosssectional area of said stove adjacent the lower end thereof, said plug being composed of hollo,w bricks laid up end for end to form vertical passages, said bricks being provided vvith roughened surfaces adapted to interlock with the cement used to lay up said brick, and standard brick checkerwork supported on said pluo and having its vertical passages registering with the vertical passaffes in said plug. o

2. fn a single pass hot blast stove comprising alined shell and a self-supporting checkerwork extending across the entire cross-sectional area of said stove and terminating short of each end of said shell so as to provide distributing and receiving chambers for the gases and air passing through said stove, a safety ier mounted in the distributing and receiving chamber at the lower vend of said stove and terminating short of the lower end of said checkerwork, said pierY being adapted to receive said checkerwork should said checkerwork drop, due to deterioration after prolonged use.

3. In a single pass hot blast stove scomprising a lined shell and a self-supporting ,checkerwork extending across the entire cross-sectional area of said stove and terminating short of each end of said shell, so as to provide distributing and receiving Chambers for the gases and air passing through saidl stove, a hollow safety pier mounted centrally in the ldistributing and receiving chamber at the lower end of said stove and terminating short of the lower end of saidcheckerwork, a cap memberA on said pier having vertical perforations therein in line with the vertical passages in said checkerwork, said pier being adapted to receive and support said checkerwork should said checkerwork drop due to deterioration or failure after prolonged use.

4. In a single pass hot blaststove comprising a' lined shell and a self-supporting checkerwork extending across the entire cross-sectional area of said stove and termi-- nating short of each end of said shell, so as to provide distributing and receiving chambers for the gases and air passing through said stove, a burner and hot blast main communicating with the upper combined distributing and receiving chamber, a stack and cold blast main communicating with the lower combined distributing and collecting chamber, and a frusto-conical baille and distributing member mounted in the lower distributing and receiving chamber, between said checkerwork, the point of communication of said stack and coldv blast main adapted to prevent short-circuiting of the air and gases through said checkerwork and provide for a uniform flow through all of said checkerwork.

5. In a single pass hot blast stove comprising a lined shell anda self-supporting ,checkerwork extending across the entire cross-sectional area of said stove and terminating short of each end of said shell so as to provide distributing and receiving chambers for the gases and air passing through said stove, a burner and hot blast main communicating with the upper combined distributing and receiving chamber, a stack and cold blast main communicating with the lower combined distributing and `collecting chamber, a pier mounted centrally in the distributing and receiving chamber at the lower end of said stove, and a baffle and distributing member mounted on said pier between said checkerwork and the point of communication of said stack and cold blast main and adapted to prevent short-circuiting of the air and gases through said checkerwork and provide a uniform flow through all of said checkerwork.

6. In a single pass hot blast stove comprising a lined shell and a self-supporting checkerwork extending across the entire cross-sectional area of said stove and terminating short of each end of said shell so as to .provide distributing and receiving chambers for the gases and air passing through said stove, a burner and hot blast main communicating with the upper combined distributing and receiving chamber, a stack and cold blast main communicating With the lower combined distributing and collecting chamber, and a transversely eX- tending perforated baille plate mounted in the lower distributin `and receiving chamber between said chec erwork and the point of communication of said stack and cold blast main, and adapted to prevent shortcircuiting of the air and gases through said checkerwork.

In testimonyr whereof, I have hereunto signed my name. L

FRANK R. MCGEE.

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