US1701287A - Furnace-wall construction - Google Patents

Description

Feb. 5, 1929.

F. H. WAITE arm.

FURNACE WALL CONSTRUCTION Filed May 4, 1925 [NV ma Al TE. W114 wsy.

ATTORNEY.

ikA/VK if G Patented Feb. 5, 1929.

UNITED STATES PATENT oFFicE.

FRANK H. WAITE AND GEORGE W. DAVEY, OF LONG ISLAND CITY, NEW YORK.

FURNACE-WALL Application filed May 4,

This invention relates to furnace -walls and more particularly to that type capable of withstanding very high temperatures 1ncluding provision allowing for expansion and contraction of the wall incident to different degrees of heat.

One of the objects of our invention is to construct a furnace wall and furnace lining consisting of superimposed blocks wherein free air circulation in at least two directions is permitted, thus maintaining the temperature of the lining lower than the interior of the furnace.

Another object of our invention is to construct a furnace wall and lining of superimposed blocks constructed and arranged wherein the individual blocks may expand and contract, allowing free circulation of air through the blocks and in the space between 2 the blocks and the outer wall and embodying improvements on our co-pending application, Serial Number 740,106, filed September 26, 1924, issued as Patent No. 1,57 0,653, dated January 26th, 1926.

In order to more fully understand and appreciate our invention, reference is had to the accompanying drawings, wherein;

Figure 1 is a fragmentary, inner face view of the furnace lining.

Figure 2 is a sectional view taken substantially on the line 2-2 of Figure 1.

Figure 3 is a sectional view taken on the line 3-3 of Figure 1.

Figure 4 is a perspective view of one of the blocks comprising the furnace lining.

Referring now to the drawings wherein like reference characters designate corresponding parts throughout the several views, 5 designates the front or side walls of the furnace, which, for convenience may comrise removable panels whereby access may be easily had to the furnace lining. The walls or panels are provided with a plurality of openings 6 each having a closure or door 7, the position of which may be maintained to regulate the artificial or natural draft to the lining and to the air chamber between the walls and the said lining. Attached to the inner face of the wall or panel is a covering of insulating material 5 with suitable openings for the passages 6 above referred to.

The furnace lining consists of a structure composed of superimposed blocks 8, which CONSTRUCTION.

1925. Serial No. 27,955.

are spaced from the front wall 5 so as to produce an air chamber 9. At certain points in the furnace lining, a spacing tile 10 and a spacing brick 11 is provided, said spacing brick being suitably supported in a substantially U-shaped channel 12 which abuts the inner face of the wall 5 as clearly shown by Figure 2 of the drawings. These respective spacing tiles and spacing bricks are arranged at regular intervals throughout the height of the wall so that the air or draft entering the chambers '9 circulates throughout the surface of the construction, which is desired to be maintained at a lower temperature than the interior of the furnace proper. The spacing bricks are very important for the reason that they prevent the furnace lining from falling outwardly toward the front wall.

The superimposed blocks 8 made of refractory material are each provided with a channel 12, extending between its ends and vertical passages 13, 14, for the free circulation of air through the blocks,. At certain points'in the furnace lining construction, it will be seen that there are provided passages 15,l16, arranged in staggered relation for the passage of the air through the lining into the interior of the furnace body. Certain of the blocks are also provided with passages 15 communicating with the passages 9, whereby the air entering through the front opening 6 will pass in a somewhat zigzag direction through the furnace lining before it enters the interior or body of the furnace. It is of course understood that the front opening 6 andthe passages 15 are arranged so that they will not be in horizontal alignment with the result that the flow of air through the furnace lining takes place in at least two directions, namely, horizontally and vertically, so that the blocks are cooled and maintained at a temperature considerably below the temperature of the furnace body. Inorder to prevent the furnace lining from falling inwardly, we have provided tie members or supports 17 which may be of metal or hollow pipe, said members passing through and being connected to certain of the blocks 8 and attached to the front wall, as clearly shown by Figure 3,

connecting members 17 prevent the lining from falling inwardly and thus the vertical alignment of the furnace lining is always maintained.

Due to the excessive heat in furnaces, considerable difliculty has been experienced in the past to prevent the furnace lining from breaking down as the result of fractures. It has been found that the fractures are due to unequal temperatures at different points throu hout the furnace lining and consequently different degrees of expansion and contraction take place with the result that the lining becomes broken. When the lining is once fractured, disintegration eventually takes place with the result that the furnace requires a new lining. In order to overcome this difficulty, we provide a block, the inner and outer face of which is slightly offset so that the ends of the blocks when assembled, are free to move relativ'e to each other sufficiently to take up the expansion [and contraction due to the increased temperatures of the furnace. When constructing the lining, it is the practice to'insert a combustible material, such as cardboard between the respective blocks so that when the furnace is started, the combustible material is consumed and the space between the respective blocks permits of the individual expansion thereof. It will thus be seen that since each block takes up its own expansion and contraction, fractures in the furnace lining are prevented and at the same time allowance is made for a free circulation of air throughout the entire surface, and to the interior of the lining through the passages 12, 13 and 14. Of course after the air has passed through the blocks, the preheated air, when introduced to the furnace aids combustion and in providing a plu rality of o enings and closures in the front wall, the raft may be regulated as desired in that any number of the closures may be opened or maintained closed as necessities may require.

While w'have illustrated and described our invention with some degree of particularity, we realize that in practice various alterations therein may be made. We therefore reserve the right and privilege of changing the form of the details of construction or otherwise altering the arrangement of the correlated parts without departing from the spirit of the invention or the scope of the appended claims.

Having thus described our invention, what we' claim as new and desire to secure by United States Letters Patent is 1. A furnace .wall construction comprising, in combination, an outer wall, an inner refractory wall, spacing blocks on the inner side of said outer wall, and tie means engaging said outer wall and adapted to hold the inner wall against the spacing blocks memes with freedom of movement of said inner wall relative to the spacing blocks.

2. A furnace wall construction comprising, in combination, an outer wall, an inner refractory wall, spacing blocks on the inner side of said outer wall, and tie means engaging said outer wall and adapted to hold the inner wall against the spacing blocks with freedom of movement of said inner wall relative to the spacing locks in any direction in the plane of the wall.

3. A furnace wall construction comprising, in combination, an outer wall, an inner refractory wall, spacing blocks on the inner side of said outer wall, and tie means engaging said outer wall and adapted to hold the inner wall against the spacing blocks with freedom of movement of the inner wall in its own plane relative to the outer wall and of the portions of the inner refractory wall relative to each other.

4. A furnace wall construction comprising, in combination, an outer wall, an inner wall composed of refractory blocks having channelled portions forming air passages therein, spacing blocks on the inner side of said outer wall, and tie means associated with the outer wall and laterally su orting the inner wall against the spacingb ocks by engagement with said channelled portions of the blocks of said inner wall.

5. A furnace wall construction comprising, in combination, an outer wall, an inner wall composed of refractory blocks having channelled portions forming air passages therein, spacing blocks on the inner side of said outer wall, and tie means associated with the outer wall and laterally supporting the inner wall against the spacing blocks by engagement with said channelled portions of the blocks of said inner wall, the engagement being slidable to permit movements of the inner wall and the blocks thereof in the plane of said wall.

6. A furnace wall construction comprising, in combination, an outer wall, an inner re ractory wall having channeled ortions forming zigzag air passages theret rough, spacing means interposed between the wa ls, and tie means connected to the outer wall and engaging said channelled portions.

7. A furnace wall construction comprising, in combination, an outer wall, an inner refractory wall having channelled ortions forming zigzag air passages theret rough, spacing means interposed between the walls, and tie means connected to the outer wall and engaging said channelled portions, togetllier with air inlets through the outer wa 8. A furnace wall construction comprising, in combination, an outer wall, an inner refractory wall having channelled portions spacing means interposed between the walls,

and tie means connected to the outer wall and enga 'ng said channelled rtions, together with air inlets throug the outer wall in staggered relation to the openings of the air passages in the inner wall.

9. A furnace wall construction comprising, in combination, an outer wall, an inner refractory wall having channelled portions forming zigzag air passages therethrough,

10 spacing means mterposed between the walls,

and tie means connected to the outer wall and enga 'ng said channelled portions, together wit air inlets through the outer wall in staggered relation to the openings of the air passages in the inner wall, and adjustable closures for said inlets.

In testimony whereof we aflix our signatures.

GEORGE W. DAVEY. [L. 5.] FRANK H; WAITE. [1...s.]

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