US2550521A - Stoker comprising furnace side wall fuel feed means - Google Patents

Description

April 1951 J. s. BENNETT ETAL 2,550,521

STOKER COMPRISING FURNACE SIDE WALL FUEL FEED MEANS Filed April 24, 19 46 2 Sheets-Sheet 1 =mlmlllll "2.

Q INVENTORS. 4 '3 oseph 6. Benn et% a 2,, By Ellen. If Th arson.

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11 h: 021mg P? 24, 1951 J. s. BENNETT ET AL 5 5 STOKER COMPRISING FURNACE SIDE WALL FUEL FEED MEANS Filed April 24, 1946 2 Sheets-Sheet 2 IN V EN TORS. Joseph 5. Bea/welt "0 BY Ellen WThorsoIz.

Patented Apr. 24, 1951 stroKEn COMPRISING FURNACE sins WALL FUEL FEED MEANS Joseph S. Bennett, Merion, and Allen W. Thorson,

Narberth, Pa., assignors to American Engineering Company, Philadelphia, Pa., a corporation of Pennsylvania Application April 24, 1946, Serial No. 664,566

G'Claifns.

' This invention relates to furnace stokers, and more particularly to stokers of the traveling grate spreader type.

One object of the present invention is to provide a stoker unit adaptedparticularly for use in connection with the larger furnace installations.

A further object is to provide in a relatively long stoker furnace a plurality of fuel feeding and distributing mechanisms adjacent a side wall thereof. 1

A still further object is to provide in a relatively long stoker furnace of the traveling grate type a series of fuel feeding and distributing mechanisms disposed in spaced relation along a side Wall cf the furnace to feed and distribute fuel over the entire grate area of said stoker.

Other and further objects will become apparent as the description of the invention progresses.

Of the drawings:

Fig, 1 is a sectional 'elevational view taken through a furnace showing a stoker construction wherein the fuel feeding and distributing mechanisms are provided adjacent a side wall of the furnace, and g Fig; 2 is a plan view taken substantially along line 2-2 of Fig. 1, certain parts being broken away to show more clearly the structure of the associated fuel feeding and distributing mechanisms.

Figs. 1 and 2 disclose a furnace construction employing a relatively long stoke'r ti. In this construction, the furnace comprises frontand rear walls 52 and 63, respectively, and side walls 64 and 65. type and comprises a series of grate members 85 secured in any suitable manner to chains (not shown). The grate members at and chains extend around sprocket wheels 6'! and {it rotatably mounted at the opposite ends of a supporting framework 69. The framework 69, as shown more particularly in Fig. l, is supported on a series of transverse I-beams IE3 which in turn are supported at the ends thereof in side walls E i and E5 of the furnace. In this construction the inner surface of wall 63 has mounted in cooling relation therewith a series of fluid conducting tubes H which are bent downwardly and rearwardly, as shown at 72, and terminate in a header l3 mounted in any suitable manner exteriorly of the wall 63. A sealing plate id and any suitable packing material 55 are provided to prevent the leakage of furnace gases beyond the left hand end of stoker 6i.

Sprocket wheels 67 and 68 are actuated by any Stoker 6! is of the traveling grate be removed from time to time by any suitable means. Any siftings passing between, the grate members 66 gravitate intoahopper '38 provided beneath the stoker 6|, which has a discharge spout 19 connected centrally thereof through which the said siftings may be directed to a place of disposal. I V e I Air for combustion enters the chamber 89 be neath the stoker 6| through an opening 8! provided in side wall 64, the air being supplied under pressure by any suitable fan or blower mechanism (not shown).

Fuel from a series of hoppers 82 mounted adjacent side wall 64 is propelled into the furnace and distributed over the grate members 66 through openings 83 provided in wall 64 by feeding and distributing rotors 84. Any suitable conveyer means is provided to convey the fuel from the hoppers 82 to the rotors 84. Each of the rotors 84 feeds and distributes fuel over a predetermined area of the grate In the illustrative embodiment four feeding and distributing rotors 84 are provided. It is obvious, however, that a greater or lesser number of rotors 84 may be provided, depending upon the length of the grate of stoker 6 I.

From the foregoing description it is seen that a stoker has been provided which is particularly adapted for use in the larger furnace installations. In order to adapt spreader stokers for use in such furnaces, it is necessary to propel the fuel over the entire area thereof. This is accomplished by providing a long single stoker, and a series of fuel feeding and distributing mechanisms located at spaced points along a side wall of the furnace. In this manner the entire area of the stoker grate is supplied with fuel.

the feeding and distributing mechanisms is burned in suspension, the remainder of the fuel which consists essentially of the heavier particles gravitates onto the stoker grates and is burned thereon as they move slowly from one end of the furnace to the other.

While the embodiment herein ShOWn and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that the invention is not to be limited thereto, since it may be embodied in other forms, all coming within the scope of the claims which follow.

What is claimed is:

1. A furnace having front, rear, and relatively long side walls defining an elongated combustion chamber, one of said side walls having a plurality of longitudinally spaced openings therethrough above the bottom of said combustion chamber; and a stoker including a moving grate mounted at the bottom of said combustion chamber and below said openings for moving fuel deposited on said grate from one end of said combustion chamber to the opposite end thereof and a plurality of longitudinally spaced fuel feeding and distributing means mounted along said one side wall, one of said means operative through each of said openings, for feeding anddistributing fuel to the grate transversely of the direction of movement of said grate and over the entire area of said grate.

2. A furnace as defined in claim 1, wherein the stoker is of the travelling grate type.

3. A furnace having front, rear, and relatively long side walls defining an elongated combustion chamber, one of said side walls having a plurality of longitudinally spaced openings therethrough above the bottom of said combustion chamber; and a stoker including a moving grate mounted at the bottom of said combustion chamber and below said openings for moving fuel deposited on said grate from one end of said combustion chamber to the opposite end thereof and a plurality of longitudinally spaced fuel feeding and distributing means mounted along said one side wall, one of said means operative through each of said openings, for feeding and distributing fuel to the grate transversely of the direction of movement of said grate and across the entire width of said grate, each of said feeding and distributing means supplying fuel to different areas of said grate, each of which areas is of lesser length in the direction of movement of said fuel than the total length of said grate and the total length of which areas in said direction is equal to the total length of said grate whereby the entire area of said grate is covered with fuel.

4. A furnace as defined in claim 3 wherein the stoker is of the traveling grate type.

5. In a, furnace having front, rear, and relatively long side walls defining an elongated combustion chamber, the combination of a moving grate extending over the length of the combustion chamber and adapted to move fuel deposited thereon from one end of said combustion chamber to the opposite end thereof, and a plurality of fuel feeding and distributing means disposed in spaced relation longitudinally along one of said side walls and above said grate, said feeding and distributing means adapted to supply fuel across the entire width of said grate and transversely of the direction of movement of said grate, the areas of fuel supplied by the individual feeding and distributing means being individually of lesser length in the direction of movement of fuel by said grate than the total length of said grate and said areas jointly covering the entire grate area.

6. In a furnace as defined in claim 5 wherein the grate is a traveling grate.

JOSEPH S. BENNETT. ALLEN W. THORSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 266,328 Swindell Oct. 24, 1882 510,550 Richards Dec. 12, 1893 510,578 Coxe Dec. 12, 1893 838,679 Box Dec. 18, 1906 984,197 Crowe Feb. 14, 1911 1,032,661 Earl July 16, 1912 1,198,841 Hand, Jr Sept. 19, 1916 1,421,419 Dersom July 4, 1922 2,271,967 Beers Feb. 3, 1942 2,387,600 Mosshart Oct. 23, 1945 2,390,155 Kessler Dec. 4, 1945 FOREIGN PATENTS Number Country Date 14,958 Great Britain Sept. 23, 1889 418,392 Germany Sept. 9, 1925 834,806 France Sept. 5, 1938

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