US1749395A - Inwall cooling plate - Google Patents

Description

vMarch 4, 1930. o. R. RlcE 1,749,395

Y y INWALL COOLING PLATE Filed OG. 22, 1927 `liatented Mar. 4, 1930 A-I'JNl'rflzD STATE-s PATENT OFFICE OWEN yIt. RICE, OE CIIICAGO, ILLINOIS, AssIGNOR To EEEYN ENGINEERING COMPANY,

OE CHICAGO, ILLINOIS, A CORPORATION OE MAINE INwALI. COOLING PLATE Application led October 22, 1927. Serial No. 227,963.

This invention relates to a cooling plate for use in a blast furnace bosh or stack, and more particularlyto a cooling `plate having a refractory nose. A

The conventional purposeof a stack or bosh cooling plate is to preserve certain contour lines within the furnace, the cooling plate being built in the furnace wall and serving in the mass as a part thereof, but having a water chamber connected with inlet and outlet pipes so that water may be circulated *25, v of the brick can be reduced, as with cooling therethrough, whereby the cooling plateacts constantly to reduce the temperature of the surrounding walls;

It has been found in practice that the contour lines of'a furnace ordinarily lack permanence in that the brick is heated to great temperatures in the course of furnace operation, in some instances reaching a temperature of 2000O F., at which temperature the brick loses its mechanical strengthand is susceptible in its deteriorated formtov being worn away by the abrasive effects of the descending material vwithin the furnace. It has been further yfound that if the temperature plates, the original mechanical strength of the brick'is preserved and the abrasion of the descending material within the furnace is endured and consequently the contour lines inV copper of the plate, if the plate is so placed,

` soon-becomes worn away by the abrasion of the descending material,thereby causing the :plate to vleak'. Hence, it is customary to so place the cooling plate that there is a thickness of brick or wall material between the nose of the plate, and the interior wall of the furnace,k This thickness of brick differs greatly in different furnaces, ranging anywhere from Ll/g inches to 27 inches, and probably averaging about 131A, inches.

In installations of this character, and as practiced prior to my invention, there has been no mechanical connection provided 4between the which in `cooling plates of the type heretofore known in the art is the inner wall of the water compartment, and the protecting material between the nose and the inner wall surface of the furnace. I accomplished this result by providing a cooling plate having a refractory nose and which nose provides considerable protection for the end of the cooling plate, but in addition I propose to install my cooling plate in the manner which has been heretofore customary, viz, by providing in addition to the refractory material a considerable thickness of brick or other wall material so that at all times the end of the cooling plate is adequately protected.

In practicing my invention, the refractory which is placed inwardly of the inner surface wall has no noticeable function during the normal operation of the furnace, i. e., when the inner wall surface is wholly intact, but when the wall portion lying between the refractory and the inner surface has been worn an extent sufficient to threaten an exposure of the cooling plate, then the supported and cooled refractory material at the nose of the plate operates to endure the abrasion of the hot stack where the brick has yielded and in this manner protecting the plate itself and assisting topreserve the original contour of the furnace interior.

Accordingly, one of the objects of my in- Vention is to provide a plate of the above described type, having a refractory nose and particularly one having means for maintaining the refractory against accidental displacement at all times.

A further object of my invention is to f the water compartment projects into the ref the appended claims.

fractory recess in a manner to be surrounded by the material to hold the material against displacement, and further'providing a pluralityof irregularly formed projections in the recess and extending in different directions whereby by the intimate engagement with the refractory material they maintain the refractory against accidental displacement. Itis a further object to provide in such a device a refractory recess having tapering enclosing walls converging outwardly whereby they aid in resisting accidental displacement ofthe refractory material.

rFliese and other objects are accomplished by means of the arrangement disclosed on the accompanying set of drawings, in which- Figure 1 1s a plan cross sectional view of a portion of a furnace wall and a cooling plate constructed in accordance with my vinvention and taken on the line 1-1 on Figure 4 and looking-in the direction of the arrows.; Figure 2 is a longitudinal sectional view of the plate shown in Figure 1 and taken on the line 2 2 looking inthe direction of the arrows; j

Figure 3 is a cross sectional end velevation of the device shown in Figure 2; and

Figure 4 is an end elevational view of the device shown in Figure 2, as seen from the right.

The various novel features of the invention will be apparent from the following descrip tion and will be particularly pointed out in Referring to the drawingslt will be noted that my invention :relates to a cooling plate 10, -which is built in the wall 11 of a blast furnace and maybe disposed in either a vertical or horizontal position (being horizontally disposed in the present disclosure), and is adapted throughthe inlet and outlet pipes 12 and 13 to provide for the circulation of water through the water rchamber or compartment 14. The cooling plate comprises a casing member 15, having the 'end wall 1:5, which islarger than the/cool4- ing plate and projects beyond the outside edges thereof in a manner to form an abutbrackets also act as strengthening ribsr and v jas cooling fins providing greater cooling area of the plate. v By referring to Figure 4 it will be noted that the plugged holes are centrally disposed and `that the inlet and outlet water connectionsare disposed at diagonally oppo site 'corners'.` Centrally ofthe watercom` partment is a web 21, made integral .with the cooling plate casing which terminates short of the end of the plate, whereby ,the twoY sides of the `water compartment are in communicasov ti-on as at 22, so that thel water introduced at o .one side of the plate, asfor instance through pipe 13, may circulate around and flow out of the opposite pi e 12. The casing walls 15 forming the main ody `of the water compartment are eX-tended'as at 23 in a slightly taper-y ingpmanner so that they'A form an enclosing sleeve, and with the end wall 24of the water compartment, a recess for receiving refractory material'25.

Attention is directed to the factthat the wall 24 which forms a Ipartition between the water chamber 14 vand the refractory recess 24 are a pluralityof irregulari'ly formed pro4 j ections 26 which are disposed perpendicitf larly to the surface from which they project .and due to the arcuate nature of the wall the various nprojections assu-me a vsubstantially yradial relationship. u 4

.In formingV cooling plates in `accordance with my invention, the body of; the plate is preferably cast of copper, it Vbeing understood, however,'that any lsuitable metal will serve, 'and Iin Vcasting the refractory recess the core is formed with al plurality Y.of irregularly cut holes, prior to its introduction into the mould, the holes being located in 'a position to properly form the'proj ections 26.

' When the plate has been Vcompletely cast,

any suitable refractory material is pacl'rad into the refractory recess and is forced there= in to anextent suflicient to cause it to lill the narrow cavities provided between' the enclosing yshell 23 and the projecting end of the water chamberand to lie inV intimate engagement around the projections 26. N hen the cooling plate has been so 'lled with refractory material the plate `is then 1placed ino in an oven to bake the refractory sufficiently to harden it in its moulded form.

By constructing the refractory nose, as above described, it has been found'that a very durable cooling plate is obtained and that'the refractory is very securely fastened by means of the mechanical connections provided. It has been found in practice that even though the enclosing shell 23 be partially worn or burned away that the refractory is still maintained in suiiicient quantities at the end of the cooling plate to offer a substantial protection thereto.

From the above description it will be readily appreciated that I have provided a cooling plate that is adequately protected, even though the brick or other wall material lying between the platey and inner wall surface .of the furnace is worn away during the furnace operation and that in such an event the mechanical connections provided are f such that the refractory will be maintained against displacement and Will offer substani tial protection to the cooling plate at all times.

I claim: 1. An inwall cooling plate comprisingy a f. casing having a water compartment and a 'recessedlnose, the wall between said compartment and nose recess being tapered in two planes in a manner to provide a portion of said water compartment projecting centrally into said recess, and refractory material in said recess and surrounding said projecting portion of said water compartment.

3. An inwallcooling plate comprising a ycasing having a water chamber and a re-k cessed nose, the wall between said chamber and recess being substantially arcuate in one direction and being provided on its surface with a plurality of irregularly formed projections disposed in a radial manner and eX- tending into said recess, refractory material recess surrounding said projections and proj ecting portion of said water chamber, whereby said material is held by said means against accidental displacement.

5. An inwall cooling plate comprising a casing having a water chamber and a recessed nose, the wall between said chamber and recess being substantially arcuate in one direction and projecting in the other direction in a manner to extend partially into said recess, irregularly formed and radially disposed projections on said wall projecting into said recess, refractoryfmaterial in said recess surrounding said projections and projecting portion of said water chamber, whereby said material is held by said means against accidental displacement, said recess lhaving tapering walls converging outwardly.

Signed at Chicago, Illinois, this 19th day of Oct., 1927.

OWEN R. nier..

in said recess, said projections extending into said material, whereby said material is held against accidental displacement.

4. An inwall coolingplate comprising a casing having a water chamber and a recessed nose, the wall between said chamber and recess being substantially arcuate in one direction and projecting in the other direction in a manner to extend partially into said recess, irregularly formed and radially disposed projections on said wall projecting into said recess, refractory material in said

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