US1638004A - Protective curtain for furnaces - Google Patents

Description

Aug. 2,1927. 1,638,004 J. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES 5 Sheets-Sheet 1 Filed July 3, 1923 v 1 f u Aug.. 2 1927,

,l. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES Filed July is, 1923 5' Sheets-Sheet 2 IMW JZn/L .15 M2.

Aug. 2,1927.

1,638,004 J. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES Filed July 5, 1923 5 Sheets-Sheet 3 IwW JOZWL 6M2.

Aug. 2,1927. 1,638,004

J. L. SCHULTZ PROTECTIVE cunmm FOR FURNACES Filed July 5. 1923 5 Sheets-Sheet 4 1,638,004 J. L. SCHULTZ PROTECTIVE CURTAIN FOR FURNACES I File ly 1923 5 Sheets-Sheet 5 QQN IEi w m Q mkwmw w R Q Q m5 Patented Aug. 2, 3 1927.

UNITED-STATES :PATENT OFFICE.

JOHN SCHULTZ, OF PHILADELPHIA, PENNSYLVANIAJASS IGNOR TO AMERICAN ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PROTECTIVE CURTAIN FOR FURNACES.

Application filed July 8, 1928. Serial No. 649,237.

One object of my invention to provide a moving curtain for use in furnaces, where ordinarily there would be a formation of clinker adhering to the furnace lining. and

5. the invention more especially contemplates a traveling curtain made of metal sections positioned to replace such portions of the lining as would commonly be attacked or engaged by the clinker. The invention further contemplates a construction 'in which the curtain sections successively enter the.

zone of high temperatures where they remain for a limitedtime only, and then move.

out of said zone so as to be permitted to cool.

Another object of my invention is to provide a novel form of wall for the ash pocket or ash discharge end of a furnace, of such construction as. to constantly present to the I 2 heated fuel and ash, relatively cool sections and thereafter remove these when they have become heated, to allow them to cool.

I also desire to provide a furnace with a curtain-like wall presenting to the ash or clinkerrelatively cool moving sections tending to break up clinkers as well as prevent,

their. adherence.

The invention also includes novel means for sup orting,moving and cooling the secso tions 0 a furnace curtain wall. v

A further object of my invention is to provide a furnacewith a wall structure so constructed and positioned. as to. facilitate the movement of the ash toward the place of 85 discharge thereof and the invention also is designed to provide a traveling curtain formed of sections constructed 'to receive and carry water as they -move into vand through the zone of high temperature with a view to preventing their belng objection- ,ably heated before they pass out of said zone.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanying draw- H1 s,'1n whlch,

ig. 1 is a vertical section of a portion of.

' a furnace showing my invention as applied thereto; Fig. 2 is an elevation, partially diagrammatic, of certain of the'structures shown in Fig. 1; 1 p p Figs. 3 and 4: are respectively front and end elevations of one of the curtain sec- .each two pairs serve to supportf-t'wo parallel tions of my invention and certain of the links associated therewith Fig. 4 showing a part in section; v 1 a Fig. 5 is a vertical section similar to that of Fig. 1,' showing a modified form of. my invention as applied to .the ash pocket of an inclined underfeed stoker, portions of which are indicated diagrammatically;

Figs. (Sand 7 are respectively front and end elevations, showing the detail construction of the' curtain sections of that form of the invention shown in Fig. 5.

Fig. 8 is a'vertical section similar to those of Figs 1 and 5, illustrating another modificd form of the invention; and v Fig. 9is a front elevation of a portion of 7 the structure shown in Fig. 8 with certain parts broken away.

In Figs. 1, to4 inclusive of the above drawings, 1 represents a portion of the brick or concrete setting of a furnace having my invention applied to that portion thereof in and 1 adjacent the ash discharge part of the furnace. The latter in the case shown, includes an ash pocket 2, in the bottom'of which are placed ash crushing rolls, of which one is indicated at 3, there being a series of plates of which one is indicated at 4, pivotally hung on brackets 5 supported in any suitable man ner from the setting 1, and extending upwardly for a short distance above the crusher rolls. Above the plates land brackets 5, the setting 1 is overhung, being provided with a top plate6 extending horizontally: above the space immediately over said brackets 5 and having horizontal beams or 90 girders 7 and 8 mounted on or adjacent the substantially vertical face of the recess undlelrlsaid plate 6, with which they are para e.

The girder 7 serves to support aseries of projecting bearing brackets 9, in which is journaled an idler shaft 10, while the beam 8 similarly supports a series of bearing brackets 11 carrying a power-driven shaft 12. These two shafts 10 and 12 are parallel and extend parallel with the ash pocket 2. each having mounted upon it a series of pairs ofsp-rocket wheels, indicated respectively at 13 and 14. The sprocket wheels of endless: chains, each consisting of a series of links 15-16 pivotally connected by pintles I7. i

plate sections each connected at its ends by the bolts 19 to a pair of the links 16, the width of said plates being such that they present to the furnace a substantially flat face extending from the upper edge of the v plates 4 to the front edge of the top plate v at 21.

6, which is downwardly flanged as indicated That face of each' section 20 I which is exposed tov the heat of the furnace is sub stantially flat, except at its lower edge whereit is provided with a horizontal, outwardly projecting rib 22. Its rear or inner face has its lower portion formed to provide a trough or container 23 designed to receive water delivered from a supply 'pipe 24t extending transversely of the furnace immediately under the top plate 6 and having outlet openings 25,- in the present instance so positioned as to direct streams of water against the inner surface, of the flange 21,- from which said water is free to fall over the plate sections .20 and collect in their troughs 23;

As willbe evident from Fig. 2 any suit 7 and supported-by the shafts 10 and912, of

. which the latter is preferably driven by power from any suita le source, so' that the plates 20' of all the series travel downwardly from under the' water supply-pipe 24 and flange 2 1. lhe flat faces of said plates are thus successively exposed to the hot gases and thereafter to the ashes and clinkers in the cket 2. 'Under these conditions, it is evident that each of the sec-v tions successively enters the zone of high temperature in the furnace and by reason of' its movement, makes it impossible, for

clinker or ash to collect upon it. At the (same time theldownward movement rof the various sections constituting the exposed run of myendless curtain tends to break or crush the clinkers, as well as to facilitate their movement toward the crushing roll 3 or other discharge pointor' agency of the -.ash pocket. While so exposed to the heat of the burning fuel in the furnace. and hot ash and clinkers, the sections 20 of the l in which wardly so that. they have upright exposed face of the curtain-become more or less heated but by reason of their movement, ultimately pass out of the ash. Pocket into the rear of the chamber or recess protected run of the curtain they travel upample time to they are mounted, where as the cool before they are again exposed to the furnace heat. 'Thewater supplied from the I pipe. 24 not only tends to further cool the sections of the curtain, butalso servesto keep them cool by collecting intheir troughs 23, from which its evaporation still further tends to reduce thetemperature of the se.c

tions.

In that form of Fig. 5, I have illustrated a slightly modified form of protective curtain and-have'shown this -as applied to the ash pocket 2* of an inclined underfeed stoker, certain of whose tuyeres are indicated at 30. These tuyeres are arranged in stepped form and below them are customarily mounted v stepped. structures 31, having beneath the-m a rearinvention shown in wardly inclined face plateq32 defining one side of the upper part of the ash pocket. Below this structure 32 is a series of verti cal plates 33 pivotally hung from brackets 34 in positions substantially opposite the' plates-4 on the rear side ofthe pocket '2 'cwhose bottom 'in this instance is provided by a pair of crushing rolls 3 and 3 In this case each hain is made up wholly of similar links 16? so proportioned that the lower edoe of each of the "plates 20 extends over-file top edge of the plate next below it, in that part of the curtain exposed to the hot' gases and ash in the furnace. 'The plates constituting the curtain sections are preferably wedge-shaped in section with their thinner edges at the top in the exposedface of the curtain and the water supply pipe 24 is provided in such position as to deliver against the downwardly extending flange 21 'of the top plate- 6, from whence the water falls onthe plate sections and links as these move over the top sprockets able or desired number of-series of endless curtain sections or curtains may be provided 13 and while they are moving downwardly. I

In this case the troughs are omitted.

--In that modification ofl'my invention shown in Figs. .8 and 9,- the plates consti tuting the curtain sections. have substantially the same construction as shown in Fig.

6, but in this case they occupy positions the reverse ofthose previously described,-

that is to say,"they"are so mounted-"on the links 16 that the lower and relativelythin edge of each plate extends {under the relatively thiok'edge of the plate next below it in that portion which is exposed to the ash and clinkers. J

It-will be noted that each of the plates stoker, it may if desiiied be used to replace or sides thereof, for example 'where "there is a possibility or a likelihood of clinker,

'12:) is-longitudinally slotted for ,thereception any portion of a. ,furnace wall-at the back ash or other material in highly heated condition attacking or collecting on said wall. In any case the endless curtain is operated to successively present tothe heated zone of the furnace, relatively cool sections and to successively remove and permit the sections to cool after they have been heated.

I claim:

1. The combination in a furnace of a movable curtain structure positioned to constitute'a portion of the furnace lining; and means for cooling said curtain structure.

2'. The combination in a furnace of a wall; an endless traveling curtain mounted adjacent said wall'to constitute a portion of the furnace lining; and means for supplying a cooling medium to said curtain.

-3. In a furnace, the combination with a furnace lining; of an endless movable sec tional curtain constituting at least one portion of said lining; andmeans for supplying -a cooling agent to said curtain, at least one of the sections of said curtain being formed to retain said cooling agent.

4;" The combination in a furnace of an endless sectional curtain forming part of the ash-receiving portion; of an endless traveling curtain formed in sections and adapted to constitute a portion of the furnace lining; means for movlng the curtain-to cause its sections to move alternately into and out of the ash-receiving portion; and means for supplying a cooling agent to said curtain, certain of said curtain sections being formed to hold said cooling agent.

6. In a furnace, the combination with a furnace lining; an endless sectional curtain constituting at least one portion thereof, certain of the sections of said curtain having opposite sides respectively adapted to be exposed to the heat of the furnace and to serve as receptacles for a cooling agent. v

7. In a furnace, the combination with a furnace wall having a' recess facing a heated zone of said furnace; of an endless sectional curtain so mounted in said recess as to present an vapproximately flat upright surface to solid material in said heated zone;- means for so moving said curtain that the sections thereof are successively exposed to said' for supplying cooling fluid to said structure.

9. The combination in a furnace of a niov ly vertically between pairs of said sprocket Wheels; horizontally extending plate sec- -tions detachably secured to said chainsand arranged to form a curtain having an upright, approximately continuous face exposed to the material in the furnace,. the curtain constituting one portion of said lining; and means for turning the sprocket Wheels to successively expose relatively cool plate sections to the interior of the furnace.v

11. The combination in a furnace .of sprocket wheels mounted one above the other adjacent the furnace wall; chains extending approximately vertically between pairs of the sprocket wheels; horizontally extending plate sections mounted on the chains and arranged to constitute a curtain having an upright, approximately continuous'face exposed to the material in the furnace; means for turning the sprocket wheels to. successively expose relatively cool plate sections to the interior of the furnace and means for supplying a cooling agent to those sections exposed to the furnace.

12. The combination in a furnace of a wall; a plate mounted therein having a downwardly projecting flange exposed to the furnace; approximately vertically extending chains mounted undersaid platef horizontally extending metallic curtain sections mounted on said chains in an endless series and positioned to present an upright approximately flat face to the heated material in the furnace, certain of the sections being extended in a protected run between said face and the furnace wall; with means for directing, a cooling agent against the flange of the plate above the curtain to perm it said agent to fall upon and cool the exposed sections.

13. In, a furnacethe combination with an ash pocket having means for removing ash-es from its lower portion; of a traveling sectional, endless curtain having a run positioned to constitute one side of said ash pocket; means for moving the curtain to cause the sections in said run to move downwardly; and means for supplying a cooling agent to the sections in the exposed run.

14. The combination in a furnace of an endless curtain constituting a portion of the the sections having a horizontally extended portion projecting into the furnace; and

means for moving the, curtain to cause the sectionsexposed to the heat of the furnace to. move downwardly.

15. Incombinatlon, a furnace Wall having a horizontal late provided with a depending expoced ange; a pair of shafts; a supporting beam for said plate provided with a plurality of brackets',having bearings for one of said pair of shafts; a second beam having' a bearing for the other .of said shafts; a curtainnrounted on said shafts so as to. protect the adjacent furnace wall; and means for discharging a cooling 'fiuid against said dependingtflange, the latter being so positioned as to cause said fluid to fall on said curtain. o

. 16. In a furnace, the combination with a furnace lining facing a heated zone' thereof; of an endless sectional curtain spaced from said lining .so as to protect the same but also constituting one portion of said lining; and means for so moving said curtain that the sections thereof are successively moved from immediate proximity to "said furnace lining in to positions exposed to said heated zone.

i J L. SCHULTZ.

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