US1733253A - Cooling plate - Google Patents

Description

oct. 29,v 1929. E p; EVERHARD 1,733,253

COOLING PLATE Filed Aug. 20, 1927 l lll/lll,

lllllllmmmnnr Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE EDGAR P. EVERHARD, OF CHICAGO, ILLINOIS, ASSIGNOR TO FREYN ENGINEERING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS COOLING PLATE Application led August 20, 1927. Serial No. 214,226.

The present invention relates to cooling plates.

More particularly the present invention relates to cooling plates such as are used in blast furnaces. The present invention relates to the same general type of construction as that referred to in the application of Montgomery Murray filed of even date herewith, bearing Serial N o. 214,225. l

Though the invention is not limited to stack cooling plates, the invention is particularly useful as applied to the stach portion of a blast furnace. The sta-ck portion of a blast furnace is subjected to such heavy stresses that it has ordinarily been consid ered undesirablev to provide apertures for the reception of removable cooling plates. Cooling plates have been used in the stach inwall of a furnace, said plates being enclosed with- 2'0 in the metal shell of said furnace, but due to the fact that said plates have not been removable, they have not been satisfactory, it being impossible to repair said plates in case leaks should occur. In the conventional hori-' zontal setting of cooling plates in a blast furnace, destruction of the plates has been encountered through bending occasioned either by downward movement of the inwall lining, or, when the plate is exposed, by the downward movement of the stock itself. A horizontal setting of cooling plates exposes the weakest dimension to the line of greatest stress.

Horizontal setting of cooling plates has another decided disadvantage. Cooling plates are ordinarily set in horizontal rows, the plates being rather close together circumferentially of the furnace, but spaced apart ver-A tically to a very appreciable extent. The high temperatures within the furnace attack the regions ofuncooled furnaces lining between the horizontal rows ofcooling plates, eating rings in the inner surface of said lining, which rings are divided by annular ridges disposed adjacent to the rows of cooling plates. Said ridges provide abutments which tend to -support the unliquefied stock within the furnace, resulting in unsatisfactory performance.

An object of the present invention is to provide an improved cooling plate which may be used in the stack of a blast furnace and which will compensate for the loss of columnar strength involved in the cutting of the holes referred to in the furnace shell.

A further object is to provide an improved cooling plate which presents its strongest dimension in a direction to resist bending forces applied thereto, which utilizes material in an economical way to provide pulling lugs which also serve as efficient strengthening ribs.

Furt-her objects will appear as the description proceeds. I

Referring to the drawings- Figure l is a horizontal sectional view of a furnace employing cooling plates embodying the principles of the present invention;

Figure 2 is a vertical sectional view of the wall of the furnace shown in Figure l;

Figure 3 is a fragmentary view illustrating a view in elevation ofrpart of the furnace shell, said view being developed into a single plane;

Figure 4 is a View in elevation of a cooling plate such as shown in Figures l, 2 and 3;

Figure 5 is a sectional view taken along the plane indicated by the arrows 5 5 of Figure 4; and

Figures 6 and 7 are sectional views taken, respectively, along the planes indicated by the arrows 6 6 and 7 7 of Figure 5.

The numeral l indicates the inwall of a furnace, the stack portion of said furnace being chosen for illustration. Said inwall is surrounded by the lining 1A of the shell 2, which shell has the apertures 3 3. The numerals 4-4 indicate cooling plates which are set into the inwall l and are presented to the exterior of the shell 2, said cooling plates being disposed in said apertures 3 3.

As shown in Figures 4, 5, 6 and 7, each of the cooling plates 4 4 comprises a housing having a front wall 5 and the enclosing walls 6 6. Said walls 6 6 include the side walls 7 7, which converge slightly from front to rear of the cooling plate. Said walls also include the top wall 8 and the bottom wall 9, which top and bottom walls converge at a relatively great angle, said convergence in a practical embodiment of the present invention being approximately equal to 21/2 inches per foot. The numeral 10 indicates a partly rounded back wall of said housing. Disposed within the cooling plate i is the baffle 11, which forms a tortuous passageway from the inlet 12 to the outlet 13 in the front Wall 5. Said inlet 12 and outlet 13 are screw-threaded for the reception of conduits for carrying cooling medium. An outlet 14 is provided which may be plugged up in service and which may be used for cleaning.

As shown in the drawings, the cooling plates are elongated in the direction of their height. A cooling plate set vertically in the furnace Wall presents its larger and therefore stronger dimension in opposition to the forces set up within the furnace wall. The result is a relatively high resistance to distortion, displacement or destruction of the plate, so that it more eife'ctually endures to function as a preservative for a stack lining.

In order to hold the plate rigidly in position independently of support from the furnace lining, each plate is flange-d at its forward portion as indicated by the numerals 15-15, the flanges being provided with bolt holes 16 for the reception of bolts passing through corresponding holes in the furnace shell 2.

y Each cooling plate 2 is provided on its front face with a pair of vertically disposed ribs 17, each of said ribs being provided with one or more apertures 18 for the reception of a hook or the like, whereby the cooling plate may be readily withdrawn from the furnace.

The means referred to for fastening the cooling plate not only holds it firmly land positively against forces from any direction from within 'or without the furnace, but it permits the ready removing and replacing of the plate in case of burning or cracking, or in case of any other event requiring the removal of the plate. Moreover, this construction eliminates the use of holding boxes and permits the entire release when removal is required. In other words, a plate that is to be pulled does not have to be dollied out of a tapered metal seat. The cooling plates, being bolted to the shell 2, serve to compensate for the loss in columnar strength in the furnace shell that is incident to the provision of the apertures 3 3 therein. The ribs 17-17 still further reinforce the cooling plate and the shell 2, whereby to compensate for the apertures referred to.

It will be noted that the present invention provides a vertically set cooling plate tapered all around, whereby withdrawaland replacement are rendered comparatively easy. By reason of the flanged construction, removal and replacement are further simplified and the columnar strength of the furnace shell is maintained regardless of the apertures provided in said shell for the reception of the cooling plates.

Though a preferred embodiment of the present invention has been described in detail, many modifications will occur to those skilled in the art. It is intended to cover'all such modifications that fall within the scope of the appended claims.

TVV hat is claimed is- 1. In a furnace, in combination, a furnace Wall, a shell, said shell being "provided With apertures, and cooling plates disposed within said apertures, said cooling plates being rigidly connected to said shell and extending into said Wall, each of said cooling plates being provided with a vertically disposed strengthening rib upon its front face for strengthening said shell.

. 2. In a furnace, in combination, a furnace Wall, a shell, said shell being provided with apertures, and cooling plates disposed within said apertures, said cooling plates being rigidly connected to ksaid shell and extending into said Wall, each of said cooli-ng :plates vbeing provided with a vertically disposed strengthening ribupon its front face, said rib comprising also a pulling means. Y

3. In a furnace, in combination, al Afurnace wall, a shell, apertures within said shell, and cooling plates disposed within-said apertures, said cooling plates being rigidly connected to said shell and extending int-o said v\vall,said cooling plates having greater-height than width, the front Walls of said cooling plate being -provided with vertical flanges providing colimms to resist vertical stresses.

4. In a furnace, in combination, a furnace wall, a shell, apertures Within said-shell, vand `cooling plates disposed within said apertures,

said cooling plates being rigidly connected to said shell and extending into said wall, said cooling' plates having greater height `than width, the front Walls of said cooling plate being provided with vertical flanges providing columns to resist vertical stresses, each of said cooling plates being 'provided with flanges adapted to be bolted to said shell.

5. In a furnace, in combination, a Wall, a shell enclosing,` same, said shell being provided With a plurality of apertures, and cooling plates located in said walland rbeing disposed within said apertures, said cooling plates comprising housings for the circulation of cooling medium and having iianges overlying said shell and bolted thereto, the forward faces of each of said cooling plates being provided with vertical ribs 'comprising columns to resist verticalfstresses.-y

6. In a furnace, in combination, a furnace wall, a shell, apertures within said shell, and cooling` plates disposed within said-apertures, said cooling plates being rigidly connected'to said shell and extending into'said wall, said cooling plates having greater height than width, the front walls of said-cooling plates being provided With vertical llanges providing columns to resist vertical stresses, the rea-r of said cooling plates Comprising housings having top and bottom Walls which converge toward one another at a relatively great angle, said vertical flanges comprising pulling means whereby said cooling plates may be pulled out of said Wall.

7. A cooling plate comprising a housing and a front Wall, said front Wall being provided With a strengthening rib comprising pulling means, said housing being elongated in the direction of said rib, said housing Converging from front to rear.

Signed at Chicago, Illinois, this 16th day of August, 1927.

EDGAR P. EVERHARD.

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