US815929A - Pulverized-fuel burner for furnaces. - Google Patents

Description

PATENTED MAR. 20, 1906. l

I c. A. MATGHAM. PULVBRIZED FUEL BURNER PoR PURNAGES.

a SHEETsfsHBET 1.

APPLICATION FILED 16.113.19.05-

2' :i n 4 4 /J i Y No. 815,929. PATENTED MAR. 20, 1906.

C. A. MATCHAM. PU'LVERIZED FUEL BURNER FOR FURNAGES.

APPLICATION P ILBD MAY 3.v 1905.

3 SHEETS-SHEET 2.

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No. 815,929. PATENTED MAR. 20, 1906.

9 c. A. 'MATGHAM l PULVERIZED FUEL BURNER- FoR FURNAGES,

AAPPL'IoATIoN I ILED una, 1905.

3 SHEETS-SHEET 3.

UNITED sTA'rnsI "PATENT yo innon. I

CHARLES A. `MAroHAM, oF, ALLENTOWN, PENNSYLVANIA.

l PuLvEmz'ED-FUEL BunNEi-'c FOR FuRNAcEs.

I Specification of LettersPatent. Application filed Hay 3,1905. Serial No.' 258,683.

,Patented mmh ao, 190e.

To a/ZZ whom, it may concern:

Be it known vthat I', CHARLES A. MAToHAM, a citizen of the United States, residing in Allentown, Pennsylvania, have invented certain Im rovements in Pulverized-Fuel Burners for urnaces, of which the following is a specification.

The object of my invention is to so conf l struct a pulverized-fuel'burner for furnaces that the complete combustion of the fuel in 7 the furnace can be effected without the necesject I attain in the manner hereinafter setin drawings, in Wh1chsity of employing -blast-fans or other apparatus for sup lying air under pressure with the powdere fuel, the natural 'draft of the furnace being relied u` onto effect inflow of' v air in such volume an in such relation to the inflowing stream of powdered fuel as to insure the'combustion of the latter. This 0bforth, reference being had to the acco'mpanyj igurel '.1 is a vertical sectional view of a I pulverized-fuel burner constructed in accordance with my invention.

Fig. 2 is a sectional plan view of the same. Fig. S'is a front view of the burr-ieri Fi 4 is a vertical sectional view of a modified orm of burner embodying Fig. 5 is a certain features of m invention.l transverse section o the same. lFig. 6' is a vertical sectional view of still another form of burner embodyingmy invention. Fig. 7 is a transverse sectional view.y of the same; and .F1g. 8 1s an end vlew, partly 1n sectlon, of

said. burner. 'Referring first'to Figs. 1; 2,'and '3 of the drawings, 1 represents the neck ofthe burner,` f which is suitably mounted in the front wall of a furnace, in the fixed end Wall ofthe supporting-structure of a rotating kiln, or in proper relation to any other structure which vis to be heated bythe combustion of the powdered fuel.

f The neck 1 .has a central passage 2 for the iniiow of the powdered fuel and on each side of the same anair-passage, said neck also having a central nozzle 4, through which the powdered fuel is fed. This nozzle 4 preferably terminatesin the neck, so thatl the fuel said structure is divi ed into a fuel-feed hopzle.

f per 10, a chamber 11 for supplying-air for.

projecting the powdered fue into the -furnace, an .a chamber 12 for supplying a vol'- ume of air below the stream of pulverized fuel, said lower volume of air, in conjunction with the volumes of air supplied through the side passages 3 and with the air which is j serving to supply all parts of said .stream with'the oxygen necessary -to support combustion of the fuel, the flow being induced by ,drawn in with thestreaml of powdered fuel,

the natural draft of thefurnace and being of a entler and easier character than that pro-v vi ed b the usual airblast apparatus ,thereby resu ting in a better diffusion of the heat and a substantially equable heating o f the furnace, rather than an eXtreme heating-of one part ofthe same at theexpense ofothe'r portions. The side passages, it will be noted, flank the fuel-nozzle and are4 arranged to dischar e their contentsinto the lire in close pro mity to the discharge of said fuel-noz;

The supply of powderedfuel to the ho' per 10 is reg -area of the opening for the issuancel of the projecting air-j et from the chamber 1 1 can be regulated by adjustment of avalve or damper 14 in said chamber, a valve' 15 in the chamber b2 serving t0` regulate .the area of passage through the same, so that the volume of air beneath the stream of pulverized fuel can be likewisev governed. In likemanner the flow of air through'the side passages 3 caribe regul ally-slidingl dampers 16,"suitably guided on the. plate 5. Hence the regulation of the airsup. ly can be closely governedto accord wit the amount of fuel which is being fed to the furnace and withk the character ofthe combustion `which it'is desired to maintain ated'by the adjustment of later-- ated by a feed-screw' 13, an the therein. Owin" hdwever, to the contracted area of the'out et from the chamber 11, asl

compared with' that from the chamber12,

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the. current of air from said chamberll is usually of a more forcible character than that from the chamber 12.

` All of the currents of airto which the fuel l is subjected travel in the same direction, and hence-have no tendency to' force the volume Inrigs. 4 and 5 I musea@ a modificationof flame toward the axial center' of the fur- IIC ao a rotating drum 20, with radial blades 21,

carried by transverse staves 22, which'constitute the eriphery of the drum, the powdered fuel eing supplied to the interior pf the drum through a hollow hub 23 and hopa per 24, and air being also supplied to the interior of the drum through an open end of the same and through openings 25 -in the casing" in which the drum rotates, the area of said openings being regulated by a damper-plate ao 26, which is mounted upon the drum-casing, so as to be partially rotatable thereon, as shown in Fig. 8. This projecting apparatus is used in combination with a neck 1 of the same character as that shown in Fig. 4, said ya5 neck having the central nozzle 4,`side passages 3, top passages 18, and bottom passage It will benoted that the powdered fuel,- however, introduced into the nozzle 4 is free 3o to eX and as soon as it leaves said nozzle, and thus comes directly under the influence of the currents of air from the passages 3, 12, and 18, and a further expansion is .permitted when the fuel leaves the neck 1, so7 that the volume of flame produced by the combustion of the fuel has a tendency to fill the furnace at once and is not carried forward in a con' y tracted`body, as it is when the fuel is forcibly projected from a nozzle in which it has been J aterally confined for sometime before it esca es. x

aving thus 'described my invention, I claim. and desire t`o secureby Letters Patenty, 1,'The combination, in a ulverized-fuel burner for furnaces, of a fue -supply nozzle arranged to discharge the pulverized fuel into the furnace at or over the furnace Wall through which the fuel asses to the furnace, said nozzle having fuelp sages, and having its walls vertically and laterally remote from the boundaries of the fuelvsup ly mouth,- whereby said walls exercise' no irect confining or contracting influence andA air supply pas- -and air-passages fianking said nozzle and discharging air-currents into the furnace in closeproximity to the discharge of the fuelnozzle so that the currents of air from the said passages meet the fuel immediately upon its issuance from its nozzle, and one or v, more air-passages arranged to discharge cur- 7o rents of air into the fuel as it leaves the nozzle and in the same direction as the firstgientioned air-currents, substantially as speci.- ed.

3. The combination, in apulverized-fuel l burner for furnaces, of a neck fitted into an opening in the furnace-wall, a pulverized-fuel supply-passage having its mouth terminating in said .neck from which mouth the pulverized fuel is free to eX and, and superposed airpassages below said fuel-supply mouth, sai upper passage supplying air in/lesser volume but with greater force than the lower passage, substantially as specified.

4. The combination in a pulverized-fuel burner for furnaces, of a neck fitted into an opening in the furnace-wall, a ulverized-fuel supply-nozzle having its disc arge end tei'.- minating in said neck and from which the gulverized fuel is free to expand as it issues om the nozzle, air-passages flanking said nozzle and arranged to discharge air-currents r into the furnace in proximity to the discharge of the fuel-nozzle so that the currents of air meet the fuel immediately upon its issuance from said nozzle, and one or more air-friassages arranged to discharge currents o air into'the fuel as it leaves the nozzle and in the same direction as the first-mentioned air-.currents, substantially as specified.

In testimony whereof I have sig-ned my name to this specification in the presence of two subscribing witnesses.

CHARLES A. Witnesses:

Gao. READER,

I. S.4 ELvEY.

IOO

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