US2042660A - Wall cooling method and means - Google Patents

Description

June 2, 1936. c. s. HULTON 2,042,660

WALL COOLING METHOD AND MEANS Filed Jan. 16, 1956 v 2 Sheets-Sheet 1 INVENT OR.

ATTORNEYJ 24 BY (g June 2, 1936. v HUL N 2,042,660

WALL COOLING METHOD AND MEANS Filed Jan. 16, 1936 2 Shee (.sSheet 2 l LLI LU INVENTOR.

BY WQZZ ATTORNEYS Patented June 2, 1936 WALL COOLING METHOD AND MEANS Charles S. Hulton, Cincinnati, Ohio, assignor to The Kirk & Blum Manufacturing Company,

Cincinnati, Ohio, a corporation of Ohio Application January 16, 1936, Serial No. 59,422

10 Claims.

The present invention relates to improved method and means for the application of air of relatively high velocity to the external surfaces of furnace walls such as tank furnaces for the purpose of cooling and retarding deterioration of said walls due to excessive heat.

A further object of the invention is to provide an improved method and means that is particularly adapted to the external surfaces of tank furnaces wherein substances are melted to form:

glass.

A further object of the invention is to provide a simplified construction which permits of a material reduction in the number of branch air feed pipes for cooling a wall and which renders such general installations more readily accessible for maintenance and repairs when required.

Another object of the invention is to provide nozzle structures adapted for mounting one each upon a branch air pressure pipe, each of said nozzles effecting the eflicient cooling of an area of a wall which, according to heretofore used constructions would require at least three such branch pipes.

Another object of the invention is to provide nozzles of this type having at one end thereof an arrangement whereby the junction of an overhanging oifset wall of. a dome or covering structure for the wall to be cooled, together with the supporting structure for the overhanging wall are also maintained at a relatively cool temperature.

These and other objects are attained by the means and method herein described and disclosed in the accompanying drawings, in which:

Fig. 1 is a cross sectional elevational view of a typical tank furnace structure showing the cooling of the exterior wall thereof at a critical area.

Fig. 2 is a fragmental elevational view showing the application of the structure of the invention to a furnace of the same character illustrated in Fig. 1.

Fig. 3 is a cross sectional view showing a modifled form of cooling nozzle of the type adapted to be supplied from an overhead air pressure main.

Fig. 4 is a front elevational view showing one form of nozzle of the invention.

Fig. 5 is a side elevational view of the nozzle shown in Fig. 4.

Fig. 6 is a view taken on line 6-6 of Fig. 4.

Fig. 7 is a side elevational view of a modified form of nozzle.

Fig. 8 is an end view of the nozzle of Fig. 7 looking from the top.

Fig. 9 is a view taken on line 9-9 of Fig. 3. The invention. is illustrated herein as applied to so called furnaces in which various ingredients are melted to form glass, because this type of furnace presents considerable difliculty in maintenance due to the fact that the refractory material, particularly in an area extending along the glass level, is subjected to a critical temperature due to the temperature of the molten glass. Heretofore; it has been customary to provide some manner of pressure air main and branch pipes leading therefrom to points immediately adjacent the area of critical temperature, said branch pipes having been very closely spaced and for that and other reasons affording numerous difliculties 15 and only a fair degree of efliciency.

In its preferred form, the method and means of the present invention eliminate two-thirds of the branch pipes and thereby effectively increase the ready dissipation of heat and at the same time render the surface of the wall open to more ready inspection and access for repairs and replacement of the refractory blocks constituting the body of the tank furnace wall.

Referring now to Fig. 1, the bottom wall l2 of a tank furnace is supported in any suitable fashion such as upon girders l3 and beams ll resting upon suitable foundation members IS. The side walls [6 are constructed of refractory blocks (not detailed) in a manner well known 30 in the art and forming no detail of the present invention. A top portion ll of the furnace is customarily constructed in an arched or dome fashion and rests upon walls l8 which are outwardly offset from thewalls J5 and are suitably. 35

supported as on angle irons l9. At suitable positions regenerators 20 are positioned exteriorly of the tank furnace structure and have their ports 2| discharging over the top of the tank closely adjacent the glass level line 22 of the 40 body 23 of glass forming materials. In adapting the present invention to such structures, an air pressure main 24 may be disposed substantially horizontally along the foundation supports [5 below the bottom level of the furnace and 45 critical temperature area of the external surface 50 of wall l6. Nozzles 28 (see Figs. 4, 5, and 6) are then bolted to the tops of the upstanding flanged ends of pipes 25. The nozzle 28 is preferably of light weight cast metal construction and is generally circular in cross section. The bolting flange 29 has perforations 30 for the reception of bolts (not shown) whereby the nozzles are coupled to the flanged upper terminal ends of the branch pipes. The nozzle '23 has a restricted end portion 3i preferably having an arcuate closed end 32 approximating the angle and curvature of the closed portion 33 at the juncture of the restricted and'unrestricted portions of the nozzle. At the top of the flat surface 34 of restricted portion 3| are a plurality of uniformly spaced outstanding bosses 35 and 33. These are slotted longitudinally of the nozzle, the openings preferably being somewhat wider at their tops than at their bottom, and they are adapted to discharge velocity air radially to the major axis of the nozzle. In the preferred form, three of these slotted bosses are provided and are adapted to discharge at angles forty-five degrees (45) apart. Immediately below the surface 33 and at the top of the full circular cross section of the nozzle are further slotted bosses 31 and 33. Bosses 35 and 31 are substantially aligned endwise of the nozzle while bosses 36 are oflset slightly from bosses 33. Beneath bosses 31 and 38 and at spaced intervals are further series of slotted bosses 33 and 43 in substantial alignment with bosses 31 and 33. As has been previously indicated, the nozzles of Figs. 4 and 5 are adapted to project upwardly beneath the juncture of the tank wall and the furnace wall l8 and are to be fed from branch pipes connected with a pressure air main near the' floor of the plant.

For use in installations wherein the pressure air mains are mounted near the roof or ceiling of the plant, the modified form of nozzle shown in Figs. '7 and 8 is employed. This nozzle is provided at one end with a bolting flange 4| for connection with suitable depending and inwardly extending branch air pipes, the nozzle having an enlarged head portion 42 with the forward face thereof provided with slotted bosses 43 and 44 extending continuously over the angularly intersecting planes where the nozzle is shouldered as at 45. The body of this nozzle is elongated and has a tapered closed end 46. Along the front face 41 of the nozzle are aligned series of slotted bosses .48, 49, and 50 which in turn are aligned with the lowermost portions of the bosses 33 and 34 at the top. These nozzles which may now be generally indicated at 50 are shown in characteristic assembly in a system in Figs. 3 and 9, where the tank wall 5i having the outwardly offset portion .52 is effectively cooled at the critical portion nozzles, it will be understood, are now spaced on centers at least two hundred per cent (200%) farther apart than was previously necessary and the slotted bosses discharging relatively ribbonlike blasts of air provide a direct impingement of the blast from the centermost row of slotted bosses, while on either side thereof the rows of slotted bosses are disposed substantially ninety degree apart, thereby providing not only the additional air blasts without the necessity of additional branch air pipes, but the outermwt ribbon-like blasts form between them a sort of vertical channel wherein the blasts are merged with the direct impinging central blast with the result that increased scrubbing and cooling heat exchange is effected. The blasts impingin angularly upon the wall furthermore tend to augment the rapid dissipation of heat from the immediate vicinity of the surface of the wall and thereby 5 provide superior cooling over the structures heretofore known and used.

. By the method of the invention the branch air pressure pipes are spaced relatively widely apart and are provided with nozzle means directing 10 vertical ribbon-like blasts at different angles to the wall and to adjacent blasts from the same and from adjacent nonles. This method of applying cooling air provides for the impingement of blasts at substantially uniform intervals along 15 the wall, saving considerably in labor and material while attaining a somewhat more eiilcient cooling action on the wall.

What is claimed is: I

l. The combination with a wall to be cooled, 20 of a pressure main extending along the length of said wall at a distance from the portion to be cooled, branch pipes extending from said main at intervals and disposed adjacent the wall, and nozzles each having divergent series of vertical 25 elongated discharge slots therein and connected with said pipes, said series of slots each directing ribbon-like blasts of air against the wall at alntgngle to the blasts from adjacent series of 3 s o 2. The combination with a wall having a portion to be cooled, of a relatively widely spaced series of parallel vertical nozzle members dis posed substantially parallel with the wall portion to be cooled, each nozzle being provided 35 with a vertical series of slots adapted to discharge cooling air perpendicularly against the surface to be cooled, each nozzle further havingon each side of the series of slots oppositely diverge'nt series of slots adapted to discharge cooling air against said wall non-perpendicularly to the wall, and means supplying air pressure to said nozzles.

3. The combination with a wall having a portion to be cooled, of relatively widely spaced noz- 4 zles disposed parallel with the wall to be cooled. each nozzle of the series having slotted bosses therein providing ribbon-like blasts impinging directly against the wall and further having slotted bosses discharging non-perpendicularly 50- against the wall whereby at least two additi blasts are impinged against the wall intermediate each pair of adjacent nozzles.

4. In a wall cooling system. the combination of a wall to be cooled, a series of nozzles unl-' 55 formly spaced apart from each other and from the wall. said nozzles having at ,least three lon'- gitudinal series of substantially aligned slots therein including a center series of slots dis charging perpendicularly against the wall and other series of slots angularly related thereto and impinging the wall at uniform intervals on op; posite sides of the perpendicular blast, and means to supply cooling air under pressure to said nozzles.

5. A nozzle for wall cooling systems comprising an elongated hollow body closed at one end and adapted .at its opposite end for coupling with a branch air pressure pipe, and a series of 70 slotted aligned bosses on said body adapted to discharge cooling air in uniformlydivergent directions from the surface of said nozzle.

6. In a wall cooling nozzle the combination of a hollow body flanged at one end for connection 75 with an air supply pipe, and slotted bosses on the exterior, said bosses arranged in substantially aligned rows, each row being positioned relative to the other so as to discharge air at a different angle from the others and all of rows discharging within a radius of approximately ninety degrees of circumference of the body.

7. In a wall cooling nozzle a substantially cylindrical body having rows of angularly divergent slotted bosses disposed over approximately ninety degrees of its circumference.

8. .A wall cooling nozzle comprising a hollow body having a major cylindrical portion and a communicating minor portion of substantially semi-cylindrical cross section, and slotted divergent bosses arranged in aligned rows of slotted bosses disposed longitudinally over substantially ninety degrees of the cylindrical portion and on the relatively flat surface of the semi-cylindrical portion.

9. A wall cooling nozzle comprising a hollow body having an arcuate face, an elbow portion extending rearwardly of the arcuate face and adapted for connection with an air supply pipe and slotted bosses extending about the elbow and along the arcuate face providing for the discharge of divergent elongated blasts of air.

10. The method of air cooling furnace walls and the like which includes the step of applying cooling pressure air in angularly divergent ribbons from relatively widely spaced common sources whereby the wall is impinged with cooling blasts at a plurality of substantially uniformly l5 spaced locations intermediate adjacent common sources.

CHARLES S. HULTON.

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