US1708486A - Boiler furnace - Google Patents

Description

- April 9, 1929. E. A. PACKARD BOILER FURNACE 2 Sheets-Sheet l Filed Nov. 5, 1925 E. A. PACKARD BOILER FURNACE April 9, 1929.

Filed Nov. 3, 1925 2 Sheets-Sheet 2 Suva/nto@ 33mg abme/13d Patented Apr. 9, 1929.

UNITED STATES 1,708,486 PATENT OFFICE..

EDW'IJSI A. PACKARD, OF YONERS, NEW YORK, .ASSIGNOB TO INTERNATIONAL COH- BUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

Borana rURNAcE.

Application led November 3, 1925. Serial No. 66,442.

This invention relates to boiler furnacesV and it has for its primary object the provision of a novel, compact arrangement of boiler furnace occupying a mininnun of both ground area' and height, whereby initial plant investment is greatly reduced and steam generated with a unitmuch smaller than at the present time required in standard practice.

-Another object of the invention is to pro- -vide a boiler-furnace of the characteristics described by virtue of which the remainder of the installation,-particularly where the fuel used is in the .form of pulverized coal,- can be conveniently accommodated in a small building.

Other and .more specific advantages. and objects will appear hereinafter. The foregoing, together wth'sueh other objects as may hereinafter appear, are ob-' tainedby means of aconstruction which I have illustrated in preferred form the accompanying drawinvs, wherein Fig. 1 is a horizon al' section thru a boiler- :furnace embodying my improvements;

Fig. 2 is a vertical section thru the boilerfurnace'of Fig. 1, and

v Figs. 3 and 4 are views similar to Figs. 1 and 2, but illustrating a modication of the 3o invention.

Referring now to the arrangements of Figs. 1 and 2, it will be seen that I have Iprovided a furnace, the combustion space of which is very largely defined by tubes subjected to radiant heat. The furnace is somewhat horse-shoe shaped in eros section, the rear portion of the combustion space being defined by a bank of vertical boiler tubes 7 connected to the upper and lower drums 8 and 9 respectively, the sides and the front being formed by vertical tubes 10. On the outside of the tubes 10 is a refractory or other suitable form of shell 11, the top of the combustion space being closed by refractory roof12. Beneath, isa refractory ash .p horse-shoe shaped header l4leads from the drum 9 around the outside of the pit 13 to a point just short of the' drum 9, this 5o header 14 lying somewhat below the shell 11. The tubes 10 rise upwardly from this header 14 to a similar header 15, this header, however,` connecting with the upper drum 8 at the opposite end and extending around.

the roof 12 to a point just short of the drum S. This header lies above the shell 11, whereby straight tubes 10 may be employed.

The tubes 7 are battled so as to provide a plurality of passes. The circulation is from the lower drum to the upper drum thru those rows of the tubes 7 nearest the source of greatest heat and thence downwardly thru those rows of tubes 7 removed from the source of greatest heat. Circulation also takes place from the drum 9 around thru the header 14 and thence upwardly thru the tubes 10 to the header 15 and around such header into the drum 8. It will be noted that the connection of the header 14 to the drum 9 and of the header 15 to the drum 8 is such that the distance to be traversed is the same thru all of the tubes 10, whereby short circuiting with possible burning out of tubes is prevented.

The powdered coal is admitted thru one or more burners 16, preferably with all of the air required for combustion and with the air and c/oal intimately mixed so as to form turbulent combustion with a short hot flame. combustion being approximately completed before thetirst pa is reached. The flame is thus essentially a vertical one and the refuse particles of combustion are thrown' down into the ash pit., these precipitating particles passing thru a water screen formed of spaced tubes 17 connected into the circulation of the boiler and operating to cool such refuse particles below slag forming temperature, whereby the particles remain in individual form capable of ready removal. The tubes 17 are connected at the rear to a header 18 and at the front to a header 19. Certain of the downcomer tubes of the bank of tubes 7 are carried down thru the drum 9 to the header 18. comers 20 lead from the header 19 to the drum 8 so that circulation takes p lace thru the screen in the direction indicated by the arrow.

The fuel being burned turbulently, th'e -furnace temperature is roportionately high and heat is absorbed y the radiant heat tubes at a very high rate. in consequence of which a large quantity of steam is produced with but a small portion of the tubes now' required to produce the same quantity of steam. The flame also short, the ertical height of the boiler-furnace is cut own.

Referring now to the construction of Fig.

f division plate 21 a ipe-2.2 leads to the drum 8. Circulation is, t yerefre, thru the header 14, the tube'slfjlththe two'jhalves of the header a and the. pipes :22, the. water and steam having to travelthe same distance thru all tubes 10.

The water Ascreen in thiscase inclines oppositely, downcomers 20a leading to the header 19, the rear header 18 being dispensed with and the tubes 17a being connected to upeomer tubes of the bank of tubes 7. l'-

1. In combination a horse-shoe shaped boiler-furnace, an upper and a lower drum, a horse-shoe shaped upper header and a lower header of the same shape, one end of the upper header being connected to the upper drum and one end of the lower header being connected to the lower drum, tubes connecting the two headers and defining the front and sides of the combustion space of the furnace, and tubes connecting the drums, said latter tubes defining the rear of the combustion space.

2. In combination, a horseshoe shaped boiler furnace, an upper 'and' lower drum, horseshoe shaped upper and lower' headers iconnected to the upper and lower drum respectively, tubes connecting the two headers and defining the front and sides of the combustion space of the furnace, and tubes connecting the said drums, saidlatter tubes defining the rear of the combustion space.

3. In combination, a horseshoe shaped boiler furnace, an upper and lower drum, a horseshoe shaped upper header and a lower header of the same shape, one end only of the upper header being connected to the upper drumand the opposite end only of the lower header being connected to the lower drum, tubes connecting the two headers and defining combustion space of the -furnace and tubes connecting the upper and lower drums.

In testimony whereof, I have hereunto signed Iny name.

EDWIN A. PACKARD.

Images