US1543940A - Water-cooled bosh plate - Google Patents

Description

June 30, 1925.

W. MATHESIUS WATER COOLED BOSH' PLATE FiledJuly 19, 1920 J... r w J 5 k a F w/ b structure in which the plate is incorporated Patented June 30, 1925.

wemnan Marmisws,

or cmcaeo, ILLINOIS.

WATER-000L511) sosn PLATE.

Applica'tibn filed July .19;

To all my camera-.-

Be it known thatwl, WALTHER M THa'srUs, a citizen of the United States, residing at Chicago, inthe county of Cook and'State oflllinois, have invented certain new and use-' ful Improvements in Water-ICooled Bosh Plates, of which -the followin g" is a specificatio. My' vention relates tocoolingplates for use in connection with blast furnaces and blast furnace operations. ,These'cooling plates are inserted in the walls of blast furnaces and -form'- a part of such walls and have water constantly circulating through them for cooling, purposes. Because-they are placed in the walls of-the furnace, usu-' ally around the hearth or bosh of the furnace, they are commonly called bosh plates. The principal object of my invention is the provision of a cooling plate which is adapted to withstand a maximum amount of external pressure due to the; masonry andiwhich will afford a. free circulation of water in'saidplate. v w

Another object of my invention is the provision of a cooling plate which can be easily manufactured and which, when manufac tured, will be without holes in the bafiles in said plate,which has been a. common expedi ent the casting o eration in the manufacture of'these coo ing plateshe'retofore in order that the core material-mould be withdrawn from the plates afterthecasting operation is com leted.. I v Another and 'rther object of my inven-. tion is the provision ofa cooling plate which, while bein cast, has suificient passages for the quic and complete escape of gases from the cores durin t e pou op eration' and also duringt ecooling' 0 the metal. As is well known, if the gas does not escape freely from the cores during the curing operation the metal will be uneven 1n the thickness and thus weakened, or will be porous, thus allowing for leakage of the water through the walls of the late.

Another and further object o my inventioni's the provision of a'cooli plate which is strong in design and in which the battles are disposed in such manner that the maximum amount of strength is afiorded without crushin the cooling plate or causin' transverse ridges to be formed therein whic resist the removal of the bafile plates from the furnace wall without the destruction of- 1920. Serial No. 397,430.

either the plate or damage to the blast furnace wall. a I v Another and further object ofvmy invention is the provision of a bosh plate having .a uniform water circulation throughout the entire plate, thereb obtaining a, uni orm cooling action, an also eliminating the danger of air pockets forming in said plates, especially nearest the side of its highest temperature. I

Still another object of my invention isthe provision of a cooling plate in which refuse or sediment will not easily become lodged but will be carried out by the current of water passing through' the said plate and the clogglng up of the water passages reduced to a mlmmum, but if the water passages should become clogged the sediment can be removed and the cooling plate kept in such condltion that the water circulatlon' is not retarded because of sediment which might collect in the said cooling plate. i

These and other objects of my invention Wlll be more readily and better understood by those skilled in the art by reference to the accompanying sheet of drawings and in which:

Figure 1 is a longitudinal sectional view of my" improved invention; and Figure 2 is a cross-sectional view on line 2-2 of Figure 1.

Referring now specifically to the drawings, it will be seen that the present bosh plate 1ncludes a back wall 10 and integrally formed therewith lugs 11,11, the said lugs 11 having openings 12, 12 therethrough which provide means for pulling the cooling plate out of the furnace wall. Side walls 13, 13 are provided,'also a nose or forward end wall 14 and top and bottom walls 15 and 16mspectively, the said side walls 13,13 and the top and bottom walls'15 and 16 being cast integrally with said back wall 10. An inlet 17 through the back wall 10 is provided through which water is forced into the cooling plate and an outlet 18 being provided through which .thewater passes out of the plate, openings 19, 20 are also provided in the back wall 10 of the plate which, when the plate is in operation, are normally closed by means of plugs. The openings 17, 18, 19 and 20 provide means for the'escape of gases from the core material during the castng operation, and also for the removal of the core material from the plate after casting, and also provide means for inspecting and cleaning out the bosh plate while it is in service in the blast furnace wall. Cast integrally with the back wall is an inwardly extending wall or baffle 21, the said balfle 21 being formed integrally also with the top wall and bottom wall 16 of the plate. The said wall 21 extends inwardly towards the nose of the baiile and within a short distance of the wall 14, and then makes a right angled turn and extends transversely across the said plate at its nose end and terminates a short distance from the side wall 13 of the plate. A baille or wall 22 beginning with the side wall 13 extends transversely across the said cooling plate for approximately one-half the width of the said plate and then makes a right angled turn in a direction towards the back wall 10 of the plate, and terminates a short distance from the said back wall 10. A third wall or baflle 23 extends inwardly from the back wall in a direction parallel with theside wall 13- and terminates short of the wall or .ba-fie 22. It will thus be understood that a passage 24 is, formed'between the wall 21 and the side wall 13 and end wall 14 of the cooling plate. A passage 25 is formed "between the wall or baflie 21 and .thewall 22. Another passage 26 is formed between-the wall 22 and the wall 23, while another passage 27 is formed between the wall 23 and the side wall 13 ofv the cooling plate. During the operation of the blast furnace, when the cooling plate is in operation, a current of water -is directed into the plate through the opening 17, passes through the passage 24,-thence around the end of the wall 21 and into the passage 25, thence around the wall 22 and into the passage 26, thence around the end of the wall 23 and into the passage 27 and out through the opening 18.

It will thus be understood that in operation a current of water is kept passing throiigh the cooling plate, which I prefer to be made of copper or any other metal having a high heat conductive property, al-. thou h 'I do not. wish to be understood as limiting myself to this particular kind of metal for the manufacture of these plates. By my arrangement of baflles, I provide a continuous andiunobstructed water. circulating passage which is of substantially umform cross section, and this passage occupies theentire interior area of the bosh plate to theexclusion of any pockets and dead water space, and therefore there. is no opportunity for sediment or other impurities contained in the water to lodge in the cooling plate. By the disposition of the bafies 21, 22 and 23 the top and bottom walls 15 and 16' are reinforced, and consequently external pressure brought to bear uponathe bosh plate from the surrounding furnace structure may in extreme cases result in lon itudinal corrugations being formed in sai top and bet tom walls, but such longitudinal corrugatlons will not interfere with the convenient endwise removal of the bosh plate from the furnace wall. This is a distinct advantage over conventional forms of bosh plates wherein the bafiles are disposed transversely of the device, for-the reason that in such devices the top and bottom walls are not properly supported and strengthened, therefore the external pressure of the furnace ing an accumulation'of sediment. The absence-of dead spaces and pockets promotes uniform heat transfer from the bosh plate to the water, thereby avoiding local overheating, steam ockets, mud accumulations and consequent estruction of the bosh plate.

The longitudinal baflles are in the load carrying area and provide great strength against external pressure of the surrounding furnace structure, and these baffles also prevent the formation of .transverse corrugations such as are produced in and. prevent the removal of other types of bosh plates which have transverse bafiles in their load carrying areas. The present arrangement of transverse baflles in the nose end of the bosh plate, which is the high temperature end thereof, permit free contraction and expansion and uniform and effective cooling in that they do not tie the top and bottom walls of the bosh plate to the inner end wall at the nose of the plate. The combination of the transverse bafiles, the longitudinal baffles and the clean-out openin in the back wall of the bosh plate provi es for ready ventilation of core material during the casting operation, easyremoval of the core material after casting and convenient and complete accessibility of water passages for removing sediment therefrom while the plate is embedded within the masonry structure of the furnace.

While I have described more or less precisely the details of construction, I do not back wall, said back wall also being provided with intermediate plu ged openings, a baflle plate leading from the back Wall and terminating short of the opposite wall and located between the inlet opening and 'the adjacent plugged opening, said bafile having a terminal extension disposed at substantially right angles to the bafile and leading towards the opposite side of the bosh plate, a second bafile plate leading from the back wall and disposed between the outlet opening and the adjacent intermediate opening, and a transverse bafile disposed between the second mentioned bafile and the extension of ll the first mentioned baflle and leading from one of the side walls of the bosh plate, said transverse balilehavin a terminal extension disposed at substantia ly right angles thereto and lying opposite the interval between the plugged openings, said baflles defining a continuous undivided and unobstructed water passage from the inlet opening to the outlet opening and occupying the entire interior area of the bosh plate, said water passage being of substantially uniform cross sectional area throughout its length.

Signed at Chicago, Illinois, this 9th day of July, 1920.

WALTHER MATHE SIUS.

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