US1933114A - Supporting construction for regenerator brick - Google Patents

Description

Oct. 31, 1933.

A. J. HULSE 1,933,114

,SUPPORTING CONSTRUCTION FOR REGENERATOR BRICK Filed June 27, 1930 2 Sheets-Sheet 1 Oct. 31, 1933. A. J. HULSE 1,933,114

SUPPORTING CONSTRUCTION FOR REGENERATOR BRICK Filed June 27, 1930 2 Sheets-Sheet 2 flfieri JHuZae,

Patented Oct. 31, 1933 UNITED STATES.

NT o-Frics SUPPORTING CONSTRUCTION REGENERATOR BRICK Albert J. -Hulse,-' Chicago, 111., assignor to H. 'A.

Brassert & Company, Chicago, Ill.,.a

tion of Illinois corpora- Application June 27, 1930; Serial No. 464,217

2 Claims. (01. 72-55) This invention relates to a new and improved" regenerator construction and more particularly to.

a supporting construction for supporting the regenerator brick.

This invention is of particular utility when applied tothe support of checkerwork as placed in hot blast stoves of the types used in ,connec-. The

enter at the bottoinoi the combustion chamber where combustion takes place. Products of combustion flow vertically to the top of the stove and then reverse their flow under the dome and travel downwardly through the checkerworl: giving oil their heat to the checkerbrick. These products of combustion pass out of the bottom of the stove through a chimney valve into the chimney.

When the stoves are used to give off heat or to preheat air for combustion in thefurnaces, the air travels upwardly through the flues in the checlzerbrick, thus-becoming heated, and passes downwardly through the combustion chamber and out to the furnace. The tern erature at the top or" the checkers may range from 20cc to 230il-degrees F. in accordance with the quality of the gas used and the efiioiency of combustion. The stack temperatures of the products of combustion vary between 300 and 860 degrees F. according to the efficiency of the stove. quires three hours to heat a stove toits maximum temperature and this heat is usually absorbed by the air during a period of one hour. methods of combustion have lengthened the cycle and shortened the gas cycle and it is theoretically possible to operate, on equal air and gas cycles, although present practice does not ape proach such operation. In any event, it will be apparent that there are very material and cornparatively rapid temperature changes throughp out the stove, and the checker-work supporting construction, the normal. operating P cycle of the stove. These changes cause the brickwork to expand and contract upon their reversal which causes conditions making the support of the hot and heavychecker column a very difficult problem. Owing to the much Ysmaller coefiicient or" expansion of metal than that of refractory material, the use of metal in such checkers is much preferable to that of refractory material, although the use of metal has never come generally into practical use.

The usual form of checker construction inhave open- The gases for combustion together? with the necessary amount of air for combustion t usually re- Modern eludes supporting members comprising brick arches superimposed on other brick arches, or in somecases of tiles supported on arches or superimposed upon other tile. Neither the tile nor the rich arch forms of design aiford' adequate permanent support for the checker column... weight, while the arches give way due to the nt the skew-back resulting from the continual expansion and contraction of the brickwork. I

According to the present invention, I overcome these difiiculties by using metal arches of special. design belowthe brick arches, these metal arches serving both'to hold the. brick arch elements in place to support them. These metal arches are preferably made of single pieces-of metal.

specially designed to stand the heat and temperature changes which may be present at their location. The brick arch supported by the metal arch also serves'to protect the metal arch against excessive temperatures and violent and rapid temperature changes. Metal members mayalso be used to provide supports for the superimposed .cross arches or cross tiles which are called riders...

and are inade of thesame refractory material and have the same expansion of coefficient as the lower arches. This construction,"therefore, avoidsdetrimental mov ment between the supporting arches: and riders, which movement in former constructions has .tendedto destroy both arches and riders at their points of contacts Suit able packing material between the metal arches and the ring walls and bet veen'the arch bricks and supporting metal may be provided fortaking care of diiierences in expansion ofthe metal and refractory erials. The diiference in coeiiicient of expansion between the metal arch and" the superimposed brick arch is also partly compensated for. by the higher temperature to which the brick arches are exposed and also if uneven expansion between the two arches causesthern tosettle unevenly, the structure has not been unduly weakened since the brick arch has been 7 designed amply strong tocarry the weight of the checker column.

The main purpose ofthe metal arch" is to hold the skew backs of the brick arches in position so that the arch cannot possibly give way. An

other important advantage of my design consists in the fact that where such metal arches are used under the briclr arches there is no necessity for theme of any wooden forms inthe construction of the brick arches. This resultsin a considerable saving in the construction of the stove. I

It is an object of the present invention to pro vide a new and improved checkerwork construction comprising metal supports for refractory arches.

The tile crack and give way underthe It is an additional object to provide a construction of this character in which the metal support is in the form of an arch and carries the refractory arches. I

It is a further object to provide construction of this character adapted to minimize the wear and breaking away of the refractory arch elements due to heat differences.

It is also an object to provide a construction in which the metal supporting elements are protected by the refractory brick work.

Other and further objects will appear as the description proceeds.

I have shown certain preferred embodiments of my invention in the accompanying drawings, in-which- Figure 1 is a vertical section through the lower portion of a stove equipped with my invention;

Figure 2 is a fragmentary portion of Figure 1 shown on an enlarged scale;

Figure 3 is a plan view of a metal supporting member;

Figure 4 is a vertical section through the member of Figure 3;

Figure 5 is a section taken'on line 55 of Figure 4;

Figure 6 is an endview of the construction shown in Figure-4;

Figure 7 is a side view of a metal skew-back construction;

Figure 8 is a view of Figure 7 as seen from the right; V

Figure 9 is a. horizontal section taken on line 1 99 of Figure 'l;

Figure 10 is a horizontal section taken on line 10-10 of Figure 7; and

Figure 11' is a fragmentary plan view showing the relation of the arches.

In the drawings, the furnace shown comprises the outer metal shell 11, the outer ring wall 12 and the inner wall 13 enclosing a combustion chamber 14. The fines leading to and from the combustion chamber form no part of the present invention and are not shown in the drawings.

The ports 15 and 16 communicate with the lower portion of the checker chamber 17 which encircles the combustion chamber 14. This checker chamber 17 is filled with checke'rworlc 18 so placed as to form vertical flues, as clearly indicated in Figure 2. These checkerbrick are supported by the upper arches 19 and lower arches 20 which rest on the ring wall construc-' tion 12 and inner wall construction 13, and also on the piers 21; The arches 19 an'd'20 are formed of a plurality of refractory brick which are tapered in form and the lower arches 20 are directly supported on the metal arches 22. These metal arches are shown in detail in Figures 3 to 6, and are provided with supporting feet 23 resting on the piers and walls, and with upwardly inclined skew-back portions 24 adapted to support the ends of the refractory arch. The arch portion 25 of the member 22 is provided with the strengthening and stiffening web 26. The superimposed arches 19 are not shown as supported on metal arches, but a central double skew-back 27 is located between the two arches, this skew-back being formed of metal and being of a special form as shown. The end skew-backs 28 which support the outer ends of the upper arches 19 may be formed of metal if desired.

The central skew-back 27 is shown in Figures '7 to 10 and is of a particular form for use in stoves having central combustion chambers. Due to the radial arrangement of the arches and the increased circumference between the piers 21 and the outer part of the stove, it is desirable, at least at certain points, to have two arches between the piers 21 and wall 12 abut against a single arch between the piers 21 and inner wall 13 as shown in Figure 11.

As shown in Figure '7, the member 27 has lower faces 28 to engage the upper faces of the lower arches 20. It has a bearing face 29 to engage the single arch 19 toward the center of the stove, and spaced bearing faces 30 to engage the spaced outer arches 19. It is also provided with a lug 31 which extends between the faces 30 and serves 7 to properly space the outer arches.

It will be apparent that the metal arch members 22 may be placed upon the piers and. walls when they have reached the proper height and the checkerwork may be placed upon them without the necessity for the use of any forms or other temporary supporting structure. It will be understood that the arches 19 and 20 are comparatively narrow in width and are spaced apart so as to provide free passage from the lower portion the stove under the arches to the checkerwork fines which are located above the arches.

While this construction is particularly designed for use in hot blast stoves, it also be adapted for use in supporting other types of checkerwork, such as the checkerwork for open hearth 'furna es or heating furnaces of various types.

Also, while the construction has been shown in connection with a hot blast stove of the type having a central combustion chamber, it may obviously be used in connection with stoves having chambers lecated at the sides.

While I preferably use cast steel for the lower arch, alloy steels, such as heat resisting steels, can be used to advantage. Where the heat is not excessive, cast iron can be substituted or any other metal may be used provided it is capable of resisting the temperature conditions prevailing at the point of installation.

While I have shown one preferred embodiment of my invention by way of illustration, it is capable or" being modified to meet varying conditions and I contemplate such changes and modifications as some within the spirit and scope of the appended claims.

I claim:

g 1. In a'rcgenerator construction, a supporting arch comprising a metal arch and a refractory arch, the refractory arch being supported upon the 'metal arch and the metal arch having end skew-back portions extending upwardly and outwardlyacross the line of thrust of the refractory arch and thereby taking the end thrust of said refractory arch.

2. In a regenerator construction, supporting means comprising superposed arches, the upper arch con isting of a plurality of separate refractory members. the lower arch being a unitary 'metal structure having integral portions extending substantially normal to the line of thrust of the upper arch and extending across said line and thereby taking the end thrust of the upper arch.

ALBERT J. HULSE.

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