US1197908A - Apparatus for feeding pulverized fuel. - Google Patents

Description

V. Z. CARACRISTI. APPARATUS FOR FEEDING PULVERIZED FUEL. APPLICATION FILED OCT. 4. 19l3- RENEWED JULY 29.1916.

l'atvntedSopt. 12, 1916.

wi/bnaooeoz f r 7 VIRGINHIS z. cnnacais'rr, or ALBANY, new oun APPATUS FOR FEEDING PULVEEIZED FUEL.

' Specification 0 Letters fatent. Patented @ept. 112, 1.91.6.

Application filed October 1, 1913, Serial No. 793,310. Renewed July 29, 1916. Serial No. 112,132.

To all whom it may concern Be it known that 1, VIRGINIUS Z. CARA- CRISTI, a citizen of the United States of America, and-resident of Albany, in the county of Albany and'State of New York, have invented certain new and useful Improvements in Apparatus for Feeding Pulverized Fuel, of which the following is a specification,

This invention relates to apparatus for feeding pulverized fuel, and the object of the invention is to devise an apparatus for feeding pulverized fuel being specially adapted for use with reference to steamboilers and furnaces.

Another object of the invention is to provide a short but intense flame, and do away with any blow-pipe action, which isthe resultof mjecting the fuel and air at a high initial velocity.

The invention will be further described hereinafter and finally pointed out in the claims.

In the accompanying drawings, which show an embodiment of my invention, Figure 1 is a vertical longitudinal section through the apparatus, and Fig. 2 is a partial end-elevation of the same.

Similar reference characters indicate corresponding partsin the views.

Referring to the drawings, the fuel-container 10 is providedwith a quantity of powdered fuel and has feeding devices 11 for the pulverized fuel at the lower part thereof. These feeding devices consist of vertically-arranged tubes, one next'to the other, and having their ends ofdifferent elevations. Each of these'tubes is provided with a feeding orifice 14, and within the tubes are arranged helical or screw feeding devices 13. These screws have at their upper ends gear-wheels 25 which mesh with each other, so as to have one gear-wheel rotate the adjacent one. The end gear-wheel meshes with another gear-wheel 15 having a shaft 16, which is driven by suitable drivin mechanism. Thus by the driving of the s aft 16 with its gear-wheel 15, all the gear-wheels 25 are rotated, and'thereby the helical feeding members 13 within the tubes 11 are rotated and cause the fuel within the container 10 to be fed by the screws through the tubes 11 and out of the lower orifices 14 thereof. The air intended to be combined with this fuel to cause its combustion is forced in at-the portion 24, in the direction of the arrows 23,

vided and intimate combination of fuel and oxygen takes place, which is fed in this combined state into the furnace. Of course, instead of the screws described, any other suitable conveying or feeding means can be provided so as to bring about an intimate mixture. The air entering the member 24 may be by means of a draft caused by the combustlon or by suitable mechanical means; the important feature, however, being that this air-current should not be of great velocity; the object of the invention being to provide means by which fuel is fed into the mixing chamber in a finely-divided condition, by reason of which finely-divided condition the fuel can be'conveyed by a current of air of low velocity into the part of the furnace in which combustion takes place, the fuel being there brought to the ignition point. The arrangement of the air-current inthe feeding orifices will cause the feeding orifices to remain cool and prevent them from being choked by the direct action of the heat. The box 27 may be widened toward the place where the combustion takes place, so that the air-current, after being mixed with the pulverized fuel, may be lowered in velocity and prevent a flame of the character of a blow-pipe. The air current will increase in cross-section as it passes through the tapering box 27 so that eddies at right angles to its movement will be produced.

"I have shown one embodiment of my invention, but it is clear that changes may be made therein without departing from the spirit of the invention asdefined in the appended claims.

What I desire to claim by Letters Patent is the following:

1. In a burner for pulverized fuel, a partially inclosed combustion space for burning the fuel, a second partially inclosed space connected therewith, means in and throughout said second partially inclosed space for feeding a current of fuel into said second partially inclosed space, means for passing a space, and out therefrom into the com'bus-h a current of air into said second'inclosed 'said current and in a direction across the current,- until the mingled current of air and fuel passes out of said second inclosedspace.

2. Ina-burner for pulverized fuel, a, par- I tially inclosed combustion space for burnvsaid tubes, into the ing, the fuel, a second partially inclosed space connected therewith, means for feeding. the fuel into the second partially inclosed space in a plurality of streams, an

independent means for passing a current of air across said streams of fuel consecutively, before said fuel enters the said combustion space, said air and fuel being intermingled before passing intosaid combustion space.

3. In a burner for pulverizedfuel, a partially inclosedcombustion space for burning the fuel, a second partially inclosed space connected therewith, a plurality of feedtubes for feeding the fuel projecting into the second' partially inclosed space, the portions of said feed-tubes projecting into said second inclosed spacabeing of unequal length, and means- -fcr directing a current of air across-"the mouths of said feed-tubes, and beyond their orifices and into the inclosed combustion space.

4. In a burner for pulverized fuel, a parconnected therewith, feed-tubes in and throughout" said second partially inclosed space for feeding the fuel into the second partially inclosedspace, the mouths of said feed-tubes being uniformly spaced from each other, and'means for directing a current of air from. the second partially inclosed space, and across the streams of fuel emerging from partially inclosed combustion space e 5. In a burner for pulverized fuel, a par tially inclosed space of progressively increasing size, means for feeding fuel in separate currents to the partially inclosed space, along the length of it, means for in- Jecting a current of air-into the partially inclosed space at the smaller end of the saidv space for mixing the air 'with the fuel as it is fed to said partially inclosed space in separate currents, anda partially inclosed combustion space at the larger end of the first named space, for receiving-the intermingled current of fuel and air, the velocity of the said current of fuel and air being less than the velocity of the current of air at the entering end of the said second partially inclosedspace.

6. In a' burner for pulverized fuel, a partially inclosed combustion space for burning the fuel, a second partially inclosed space for mixing the fuel with air from the atmosments at right angles to the main direction of the flow of the air whereby said currents of (fuel and air are thoroughly interming e 7. In a burner for pulverized fuel, a partially inclosed combustionspace for burning the fuel, a second partially inclosed space for mixing the fuel with air taken I from the atmosphere,iand having a temperature below the ignition point, a plurality of means for feeding fuel into said second inclosed space-,means for feeding a current of airacross said fuel, and means in said inclosed space for splitting a portion of the current of air into a plurality of individual streams, and simultaneously imparting at the point of impingement of the portion of the'air current, moyements angularly to the direction of flow.

8. In a fuel burner, a partiall inclosed combustion space for burning t e fuel, a second partially inclosed, space for mixing the fuel withair, a series of spaced fuel feeding-tubes in and throughout said sec-. ond partially inclosed space, and an air inlet passage for admitting air from the atmosphere at one end of said second partially inclosed space, said second partially inclosed space being enlarged away from said inlet passage toward an outlet assage to a partially inclosed space for urning the fuel, whereby the velocity of the intermingled current of fuel and air entering said combustion space is less than the current of air entering from the atmosphere.

9. In a burner for ulverized fuel, a partially inclosed space or burning the fuel, a second partially inclosed spaceconnected therewith, said second partially inclosed 10. In a burner for pulverized fuel, a partially inclosed space having diverging walls,

a plurality of feed tubes arranged in a row aaa'aaea across the width'ot the saidinclosed space,

the orifices of said row of feed tubes extendroW and extending across the width of the inclomd space, the second row of teed tubes having their orifices a greater distance from the lowermost wall than the first row, and the third row having their orifices at a greater distance from the lowermost wall than the second row, and the fourth row having their orifices at a greater distance than the third row, so that the innermost row, at the-widest art of the inclosed space,- has the greatest stance from the'lowermost walhand an air feeding member at the narrowest ortion of the inclesed s ace.

ll. lna hurner for pulverized fue an air feeding" member, a mixing member having top and bottom walls diverging from the air feeding member, and a plurallty of rows of feed tubes arranged across the width of the mixing member and along the length thereof; the first rowacross the width'extending lowermost, thatollowing rows across thev width being each shorter than the other, so that the last row across the width has the greatest distance from the lowermost wall of the mixing member, the feed tubes forming the rows along the length of the mixing member being in line with-each other.

'In testimony that l'claim the foregoing as my. invention, I have signed my name in presence of two subscribing witnesms.

" 1 S a. caoms'rr.

z I F. H9 F. Fran

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