US1952711A - Fuel distributing system - Google Patents

Description

March 27, 1934. A. M. HUNT FUEL'DISTRIBUTING SYSTEI Filed Sept. 25, 1931 ifa/efeaea T TOR NE Y.

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Patented Mar. 27, 1934 UNI-reo srmssg FUEL DISTRBU'ING SYSTEM Andrew M. Hunt, deceased, late of Berkeiey, Calif., by Crocker First Federal Trust Company, San

Francisco, Calif., executor, assigner to The Standard Stoker feinpany, Incorporated, a corporation of Delaware Application September 555, 19:31, Serial No. 585,251

' s claims. (ci. irc-iep This invention relates to stokers of the scatter feed type wherein fuel is discharged over a rc bed by a pressure fluid blast and has for its ol,- ject the provision of a new and improved fuel distributing system and more particularly to a Cal new and improved firing table for separating the line from the coarse fuel and separately distributing each over the frebed.

They present invention provides an improved system of distributing fuel wherein the coarse and fine fuel are separated and each is separately discharged over the rebed by blasts of different intensities which may be controlled and regulated to meet the varying conditions of firing. Numerous attempts have heretofore been made to separate coarse and ne fuel with various degrees of success or failure. The present inE vention contemplates the' use of an improved firing table in the form of a hollow casting, the

-- top wall of which is provided with a riddle permitting fine fuel to drop therethrough and coarse fuel -to passA thereover, and the bottoniwall of which is provided with means for evacuating the hollowV firing table thereby drawing ne fuel through the riddle and effecting a complete separation from the coarse fuel, and discharging theflne fuel through openings provided in the front wall of the firing table.

The invention further consists in the parts and the arrangement of the parte as will be hereinafter described and as illustrated in the accompanying drawing, in which Eig. 1 is a vertical section of a portion of a furnace and a Stoker therefor, showing the in vention in` position therein;

Fig. 2 is a detail plan section on of vFig. l;

Fig. 3 is an end view of the stolzer and firing table taken through the firing opening from within the Firebox; and

Fig. 4 is a section on the line 14 of Fig. 2.

The invention is illustrated and described as applied to a locomotive, but it will be apparent that the invention is equally applicable to furthe une 2-2 haces of other types wherein the invention may CII be used to advantage. Y

A portion of a locomotive. boiler rebox is shown at l() and is provided with the backwall lllhaving a firing opening 12 therethrough. The iirebox grates are shown at 13.

1 The i vention is applicable to various types of stckers and only so much of the stoker as is necessary to an understanding of the invention has been illustrated. The portion of the Stoker u shown-comprises a riser conduit 14 rigidly supported from the baclwall 1l by `a bracket 15. kA y conveyor screw 16 advances the fuel through the riser 14 to the firing opening where it is received on a ring table 17 which will be described in detail further on in the description.

The riser conduit i4 is provided with .a removable cover section i3, which may be hinged at f upper end providing access to the interior riser conduit. The fuel delivered by the riser conduit 14 is on the ring table 17 from whence it proies -d into the fircbox. The firing table 17 is pref bly, but not necessarily, in the form of an i egral casting provided with the une fuel cir-.einher 19 and comprising top and bottom walls 20 and 2l respectively, and front and rear 'walls 23 respectively. The firing table 17 is securely fastened to the depending flange 2li oi' the forward wall of the riser conduit 14 through rear wall 23 by suitable means, asby the bolts 25.

The rearward portion 26 of the top wall 20 is offset in a slightly higher plane from the forward portion 27 of the top wall 20. A steam chamber 28 is formed in the' top wall 20 at the offset between the forward and rearward portions of the top wall 2G. The rearward portion 26 of the firing table top wall 20 is apertured. forming a riddle 29 for separating the une fuel from the coarse fuel. The coarse fuel is urged forwardly across the rearward portion 26 of the firing table top wall 2i) by the impelling action of the screw 16 onto the forward portion 27 from where it is distributed over thefire by a pressure fluid blast issuing from the chamber 28 through the jet openings 30. The forward side portions of the forward portion 27 of the `firing table 20 are provided with the pockets 31, which serve to receive and direct a portion of the coarse fuel to the rear corners of the rebox.

The front wall 22 of theiiring table 17 is prou vided with a plurality of fine fuel discharge openings in diameter at the outside than at the inside in order to make them self clearing. A steam charn-- ber 33 is formed in the bottom wall 21 intermediatethe front and rear walls of the firing table 27. The forward face of the steam chamber 33 is provided with a plurality of jet openings 34 in alignment with the openings 32, whereby a blast of pressure fluid is discharged from the chamber 33 through the jet openings 34 and the fuel discharge openings 32 creating a vacuum inside thel firing table 27 drawing the fine fuel through the riddle 29 and discharging it through the openings 32 over the fire beneath the path of the coarse fuel.

Preferably, the blast issuing from the jet openings 30 of the tcp wall of the firing table is more powerful than the lower blast issuing from the jet openings 34, this arrangement being desirable because the high pressure blast distributes the Ylump fuel, whereas, the lower blast scatters the finer particles of fuel which do not require the same force for distribution over the fire. The

32, which are preferably slightly larger v upper blast also serves as a cover or blanket for the lower blast, preventing to a considerable extent the loss of ne fuel normally discharged through the stack unconsumed because of the heavy draft during operation of the locomotive.

The chamber 28 receives pressure fluid from a suitable source of supply through the supply pipes and the chamber 33 receives pressure fluid through the supply pipe 36.

What is claimed is:

1. In a fuel distributing system for scattering fuel in aerial paths over a fire, a chambered firing table having top, bottom and front walls, means for delivering fuel to said top wall, riddling means in the rearward portion of said top wall whereby fine fuel drops through said riddling means onto said bottom wall and coarse fuel passes thereover, pressure fluid blast means forward of said riddling means for projecting the coarse fuel forwardly across the forward portion of said top wall, fine fuel discharge openings in the front wall of said chambered firing table, and means arranged tc evacuate said chambered ring table entraining fine fuel laden air through said riddle and discharging it across said bottom wall and through said fine fuel discharge openings.

2. In a fuel distributing system for scattering fuel in aerial paths over a fire, an approximately rectangular hollow firing table including a top, bottom and front wall, means for delivering fuel to the top wall of said firing table, riddling means in the rearward portion of said top wall whereby fine fuel drops through said riddling means onto said bottom wall and coarse fuel passes thereover,

pressure fluid blast means in said top wall forward of said riddling means for distributing the coarse fuel, a plurality of openings in the front wall of said hollow firing table a pressure fluid -blast means in said bottom wall arranged to issue through said openings in the front wall of said firing table creating a suction entraining fine fuel laden air through said riddling means and discharging it through the openings in said firing table front wall.

3. n a fuel distributing system for scattering fuel in aerial paths over a fire, a cored firing table comprising a top wall having a pressure fluid chamber formed therein intermediate its forward and rearward edges, a bottom wall having a pressure fluid chamber formed therein and a front wall, means for delivering fuel to the top wall of said firing table, perforations in the rearward portion of said top wall forming riddling means whereby fine fuel drops through said riddling means onto said bottom wall and coarse fuel passes thereover, nc fuel discharge openings in the front wall of said ring table, a series of forwardly directed jets communicating with the pressure fluid chamber in said top wall for distributing coarse fuel and a series of forwardly directed jets communicating with the pressure Huid chamber in said bottom wall arranged to evacuate the cored portion of said firing table entraining fine fuel laden air through said riddling means and discharging it through the openings in said firing table front wall.

4. In a fuel distributing system for scattering fuel in aerial paths over a re, a cored firing table comprising a top wall having a pressure iiuid chamber formed therein intermediate its forward and rearward edges, a bottom wall having a pressure iiuid chamber formed therein intermediate its forward and rearward edges and a front wall, said pressure iiuid chambers and those portions of the top and bottom walls rearward thereof being raised with respect to the forward portions of said 'top and bottom walls respectively, the rearward portion of said top wall being formed as a riddle for separating fine fuel from coarse fuel, the fine fuel dropping through said riddle onto said bottom wall and coarse fuel passing over said riddle, a series of jets communicating with the pressure iiuid chamber in said top wall for issu ing a blast across the forward portion of said top wall for distributing the coarse fuel, pockets formed in the forward side portions of said top wall for deiiecting a portion of the coarse fuel laterally, a series of openings in the front wall of said firing table, a series of jets communicating with the pressure iiuid chamber in said bottom wall for issuing a blast across the forward portion of said bottom wall through said openings in said front wall whereby suction is created in said cored portion of said firing table entraining fine fuel laden air through said riddle and projecting it forwardly across the forward portion of said bottom wall.

5. As a new article of manufacture a firing table in the form of a unitary member comprising top, bottoni, front, rear and sidewalls enclosing a cavity, pressure fluid chambers formed in said top and said bottom walls, respectively, intermediate said front and rear walls, openings in the front wall of said firing table communicat ing with said cavity, a series of jets communicating with the pressure fluid chamber in said top wall and directed across the forward portion of said top wall, a series of jets communicating with' the pressure fluid chamber in said bottom wall and directed across the forward portion of said bottom wall and a plurality of perforations in the rear portion of said firing table top wall forming a riddle, said riddle being spaced apart from the bottom wall of said firing table.

6. As a new article of manufacture a firing table in the form of a unitary member comprising top, bottom, rear, front and sidewalls enclosing a cavity, pressure fluid chambers formed in said top wall and said bottom wall respectively intermediate said front and rear walls, said pressure fluid chambers and the rearward portion of L said top and bottom walls being raised with respect to the forward portion of said top and bottom walls respectively, a plurality of perforations in the rearward portion of said top wall forming a riddle, said riddle being spaced apart from the bottom wall of said firing table, a series of jets communicating with the pressure fluid chamber in said top wall directed across the forward portion 'of said top wall, a series of jets communicating with the pressure fluid chamber in said bottom wall and directed across the forward portion of said bottom wall and a plurality of openings in the lower portion of the ring table front wall in alignment with the jets in said bottom wall pressure fluid chamber.

[1.. s.l CROCKER FIRST FEDERAL TRUST COMPANY, By E. F. LAWRENCE,

Assistant Trust Olicer, Ezrecator of the Last Will and Testament of Andrew M. Hunt, Deceased.

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