US1919087A - Furnace side wall - Google Patents

Description

y 1933- w. 1. BOWDEN FURNACE SIDE WALL Filed Aug. 8. 1929 VIILLIATE BOWDEN, OE PHILABELP I ENGINEERING o OE 03? PENNSYLVANIA Application filed August 8, 19529.

This intention relates to improvements in the construction of furnace side walls, and more particularly to improvements in side walls a type includine' fluid-cooled such for example as that illustrated in the copending United States application Serial Number 219,706, filed September 1', 1927.

Une of the objects of the invention is to provide means for preventing molten slag flowing down the side walls from coming into contactwith the fluid-cooled and forming thereon a hardened coating prerenting cfficient operation of the fluid-cooled areas for their intended purposes.

The invention also has application to furnaces of the typeincluding stohers hav ng; inclined retorts; and one the objects of tee invention is to provide means for preventing; molenslag from runnin down the furnace sice walls to an extent and a manner interfering with the normal movement of fuel in the immediately adjacent retorts. i

In the attached drawing:

Figure 1 is a more or less diagrammatic vertical-sectional Vic? through stolrerequipped furnaceillustrating an embodiment of my invention;

2 is a section on the line 22, Fig. l,

and

Fig. ot Fir;v 2 the scope ectional view similar to that 1 indicates an o-pen itl. to the drawing a furnace hav ing 2 in which established the rward end of a multiple-retort automa ic stoker '3. The st her extends from said opening into the furnace, the rear end hereof being sup-- ported upon beam -la point spaced apart from the rear wall a of the furnace to thereby form in the 'iiiiorrening space an ash pocket 6. The usual mechanism 7 is pro 'ided as a part of o to adwnco the fuel at receternunec down the i nay be made in accordance with the pr l inciples set forth in EEC I A'EilFrB-ICAN iSSIGh COBPGRATIZUN "MIA,

retention Warm sea-m1 Il'o. 33 2,24 7.

aforesaid copencling' United tates application Serial Number 219,706. Asshown in 2 and 3, this fluid-cooled section may consist of a set of refractory blocks 10 assembled. to form section of the wall eX- tending; from the front Wall of the furnace to the rear wall v5 and conforming approximat y to the inclination of the inclined grace surface of the stolrer. Associated with the refractory blocks 10 is a series of pipes ll'which connect with headers 12' and 13 located respectivelybehind the walls 1 and 5. These headers may be connected either with the circulating; water system of the furnace r with an independent circulating fluid system whereby heat is continuously withdrawn rom the blocks 10. The fluidcooled panel 9 is so placed as to constitute an abutting: surface for the burning fuel in the cont uous retorts.

In a furnace of this type and where a relatively narrow band of fluidcooled side wall is employed, the refractory walls above the-fluidcoolcd sections'are frequently suliiciently hot to permit molten particles of ash and eroded refractory material to flow down the walls and when this molten slag comes in contact withthefluid-cooled'pau. els portions oft; slag chilled and hard- 7 ened, thereby ruling a coating of slag over the bloclrs 10 which increases in thickness as the operation of the furnace is continued imtil it. he-omes a serious factor in preventing efficient heat transfer through the fluid-cooled sections of the wall. I have discovered that these undesirabl {ICOlllYllllZt-r tions of may be largely avoided by placing;- oneor more tubes labove the fluidcooled wall section, these tubes being placed the inside of the wall and preferably in direct contact therewith and extending the full width of the wall between the front and rear walls 1 and 5, as illustrated. Prefer.- ably the tube or tubes 1% are connected with the headers 12 and ,13 as illustrated in Fig. 1, and thereby form a part of the circulating -fluid system including the said headers and the pipes 11; The slag flowing down the side walls collects above the tube or thereon and drips off the inner edge of the tube directly onto the fuel bed without coming into contact with the fluid-cooled wall section 9. Accumulations of hardened slag on the fluid-cooled surfaces are thereby effectively prevented.

In the operation of stoker furnaces of the type illustrated herein, it has been found that the molten slag running down the side walls as previously described tends to form obstructions seriously interfering with the advance movement-s of the fuel in the retorts. The slag flowing down the side walls in a continuous stream or sheet runs into the fuel bed, and asit reaches the cooler temperature of the igniting fuel hardens and forms the fuel-retarding obstructions. The foregoing device constituted by the pipe or pipes let is effective to prevent the formation of these obstructions.

As describechthe slag collects above and on the tubes 14 and drips from the inner. edge of the latter onto the fuel bed in relatively small particles'which are readily ad'- vanced in the retorts with the fuel itself. The tubes 14 break I of slag and prevent the relatively large and solid accumulations, which as set forth above tend to obstruct the fuel movement.

While the use of pipes connected with a fluid circulating system has'been found most effective for the purposes set forth and is therefore preferred, it will be apparent that some of the advantages of the invention may be realized by the employment'of any similar structural arrangement which prevents the continuous flow of molten slag down the side wall over the fluid-cooled sections of the latter (where the side wall includes such flnid-cooled section) and into the fuel bed.

I claim:

a 1. In a furnace, a stoker including a retort immediately adjacent a wall of said furnac and means for advancing fuel along the retort, means in said side wall above the top of .said retort for diverting molten slag floving down said wall from the lower wall areas and for deflecting said slag into the .fuel bed atpoin-ts apart from the said wall, and a fluid-cooled panel in said wall below said deflecting means.

2. A furnace side wall comprising a fluidcooled panel ci'mstituting an abutment for the fuel bed, and means on said side wall above the said panel for diverting molten slag flowing down the wall from the fluidcooled panel and for deflecting said molten slag onto the fuel bed at points spaced apart from the .said side wall.

3. In a furnace, a stoker including a retort adjacent :a wall of said furnace, and means for advancing fuel along the retort, a shoulder extending along said wall above the top of said retort for diverting molten slag flowing down said wall from the lower wall areas and for deflecting said slag diup the continuous flow rectly into the fuel-bed at points apart from said wall, and a fluid-cooled panel in said wall below said shoulder.

4. In a furnace, a stoker including a retort adjacent'a wall of said furnace, and means for advancing fuel along the retor a nuidcooled pipe extending along and. in contact with said wall above the top of said retort for diverting molten slag flowing down said wall from the lower wall areas and for deflecting said slag directly into the fuel-bed at points apart from said wall, and a fluid cooled panel in said wall intermediate said pipe and the top of said retort and constituting the said lower wall area.

5. In a device of the class described, a furnace wall, an inclined cooling panel provided in said wall, the inner surface of said panel being substantially flush with the inner side of the wall proper, and means provided on said wall above said cooling panel and projecting from the common plane of said wall and panel for diverting theflow of slag down the wall from the panel.

6. In a device of the type described, a furnace wall, a cooling panel provided therein, and slag diverting means comprising one or more fluid conducting tubes positioned above said wall panel, said tubes being arranged in offset relation with respect to said flui-dcooling panel.

In a device of the class described, the combination with a ,furnacewall, fluid con ducting tubes provided in said wall for cool ing a portion thereof, slag diverting means comprising .one or more fluid carrying tubes arranged in parallel offset relation with respect to said first mentioned tubes, said parts being so constructed and arranged that the molten slag flowing down said wall will be diverted away from the wall, leaving said first mentioned tubes free from slag. l

8.- In a device of the class described, the combination with a furnacewall, a panel provided therein having a series of fluid conducting tubes, a refractory placed on said tubes, the surfaces thereof exposed to the furnace being substantially flush with the wall proper, and slag diverting means comprising one or morewater tubes arranged in parallel offset relation with respect to said panel, said parts being so constructed and arranged that. the molten slag flowing down the wall will. be diverted away from the wall,

thereby leaving the surface of the panel free from slag.

9. In a furnace, a Stoker including a grate and means for advancing fuel over said grate, a wall adjoining a side of said grate, means for cooling an area of said wall adjacent the top of the grate, and means projecting from the surface'of said wall for diverting molten slag flowing down the wall from. said area.

10. In a furnace, a stoker including a furnace Wall, liquid cooling means for an area of said wall, and means comprising one or more fluid conducting tubes positioned above the bottom of said cooled area and projecting outwardly beyond the surface of the latter for diverting molten slag flowing down the Wall from the lower portion of said area.

WM. I. BOWDEN.

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