US942696A - Coal-dust burner. - Google Patents

Description

u. w. ZELL. GOAL DUST BURNER.

I APPLICATION FILED MAY 6,1909.

942,696;4 v -Patented Dea?, 1909,

2 SHEETS-SHEET 1.

J. W. ZELL.

GOAL DUST BURNER.

APPLICATION FILED MAY 6,1909.

Patented Dec. 7, 1909.

2 SHEETS-SHEET 2.

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. combustion chamber of the furnace.

entran sfrarns narrante ortica.

JOHN W. ZELL, OF DUNCANNON, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO GEORGE PENNEL'L, OF DUNCANNON, PENNSYLVANIA.

COAL-DUST BURNER.

erases.

Specification of Letters Patent.

Patented Bec. 7, fd.

To all whom it may comerfn.:

Be it known that l, JOHN W. ZELL, a citizen of the United States, residing at Duncannon, in the county of Perry, State of Pennsylvania, have invented certain new and useful Improvemen in Coal-Dust Burners; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

rlhis invention relates to improvements in furnaces and more particularly to the type zdalpted for the use of powdered coal as a The invention consists in an attachment for a melting or puddle furnace wherein high degrees of temperature are required to perform the melting function. It is cus- Itomary in the use of furnaces of this type to employ a pipe which serves as a combined pressure and fuel distributer to the The general `method consisting in the employment of a hopper which feeds coal vdust into a ipe, the coal dust as it enters the latter fa ls in the path of a blast of air or steam which directs it to the combustion chamber. This arrangement has many disadvantages, chief among which is that the blast of mixed air and coal dust impinges a ainst the wall of the furnace and in tuneoroes an opening through the latter. The present inventionaims to rerned this defect b employing a casing locate in advance o the coinbustion chamber and a spreader adjustably tted within the casing and so positioned that the mixture of air and coal dust will be deflected and spread over the entire surface of the combustion chamber.

Another object is the provision of an improved form of spreader throu h which an air or steam blast is directed an from which it emerges at right-angles to the feeding blast, whereby the latterfblast is positively prevented from impinging at one spot on the furnace wall.

With these and other objects'in view as will more fully hereinafter appear, the present invention consists in certain novel details of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawin s and more .particularly pointed out in t e appended claims, it being understood that various changes in the form, proportion, size and minor details of the device` may be made without departing from the spirit or sacriicing any of the advantages of the invention.

In' theaccompanying drawings forming part of the speciiicationz-ligure l is a vertical sectional View of the lower portion of a puddling furnace showing the casing in longitudinal section and applied to the furnace and showing the fuel feed pipe, blast pipe and defiector arranged within the caslng and also showing in side elevation the a paratus at one end of the fuel feed pipe or supplying and forcing fuel through the fuel feed pipe. Fig. 2 is a detailed perspective of the spreader. F ig. 3 is a longitudinal section of the spreader. Fig. i is a similar view of the hopper.v

Similar numerals of reference are employed to designate corresponding parts. throughout.

The furnace is designated in general by the numeral 5, and is provided with the usual side and end walls. rThe combustion chamber within'the furnace is designated by 23, and is separated from the heating or melting portion by the dead or baffle wall 7.- Thefront Wall of the furnace is provided with the usual feed opening and located in advance of the front wall and surrounding the opening is one end of a circular casing 6, this casing is preferhbly of metal and may be of any required length and at its outer' end is provided with a cap or cover 24, which may be threaded orothcrwise secured to the front end of the casing. A blast pipe 9 rises from the upper side and adjacent the outer end of the casing and has its upper end communicating with a blast fan.(not shown) which drives a blast. to the combustion chamber 23 through the casing 6.

A hopper designated by the numeral 10, is disposed in front of the furnace and at a suitable distance therefrom. It must be understood that this hopper is shown merely for purposes of illustration and I am not tobe,.,limited to its use, since from what will appear later, it will be understood how various other forms of feeding hoppers may be equally aswell employed. The hopper' is shown provided *with a vertically disposed feed screw 11, ari anged in the throat of the hopper. Leading into one side of the throat 12 Iis' a' pipe 13, the opposite end of which' throuOh the casino (l into the combustion communicates with a blast fan not shown). '.lhe inner end of the blast pipe 13 is located beneath the lower end of the feed screw 11 and in direct alinement with the inner end of a feed pipe 14. The latter extends from that side of the throat opposite the pressure pipe 13 and leads through an opening in the cap 24 and with the casing G,`where it terminates at a point substantially in alinen'ient with the intermediate portion of the said casing. Thus it can be seen when the hop-I per is filled with powdered coal and the feed screw 11 turned by any well known means that the falling particles of coal will fall into the path of the blast through the fuel feed pipe and by the said blast be directed into the fuel feed pipe 14 and then o thrbugli an opening in the cap 24 directly above the openingfor the pipe 14 and extends to a point considerably in advance of the fuel feed pipe 14 and adjacent the feed opening ofthe furnace. The extreme inner end portion of the pipe 17 is curved downwardly as shown at 1S, and thence extended outwardly as shown at 19, with its 'outlet disposed in axial alinement with the outlet of the fuel feed pipe 14.

A dcflcctor or spreader is designated by the numeral 2O and is shown to bea conical shaped body, the cent-ral portion of the base of which is secured to the blast pipe 17 whereby its apex 21 is in true axial alinement with the outlet of the supply pipe 14.

.The deflector 1S) is provided adjacent its base with a plurality of spaced openings 22 through which the air or steam escapes. Thus it will be seien when the mixture of coal dust and air emerges from the inner end of the pipe 14 as before described, it will. abut against the surface of the spreader or defiector 20, this in itself would be sufficient to deflect the mixed stream sufficiently to prevent it impinginp; at a certain spot on the bai-lie or dead wall. 7 of the furnace, in order to positively deflect the stream, however, and at the same time distribute it evenly over the. surface of the combustion chamber steam or air is admitted through the vtube 25 and pipe 17 into the deliector from which it escapesthrough the holes 22 and will. issue at right-angles to the mixed stream of coal dust and air whereby the latter will be scattered in all directions over the surface of the combustion'chamber.

the fire.

il/ith this construction it can be seen that l have provided a device which is comparatively simple in structure and inexpensive to manufacture and which will operate to both save the baille 'wall and by virtue of the even distribution of the mixture of dust and air serve to generate a lgreater heat. By causinglive steam to enter the combustion `chamber through the openings 22 will greatly add to the utility of the device inas much as the particles of coal dust will remain sufliciently long in the combustion chamber to be thoroughly consumed so that there will be practically no waste such as heretofore has been the case with devices of this kind.

lt is well known in devices of this kind that coal dust when damp is diiicult to spread and also when extremely fine has a tendency to fly and not spread evenly over ln order to overcome this and vide a construction whereby the collector may be adjusted. to and from the supply pipe, the following construction is enrployedz-By referring now to Fig. 1 it will be seen that located within the casing 6 are a pair of spaced blocks 26; these blocks are preferably of metal and are rectangular in contour and adjacent their lower ends are provided with transverse openings adaptedl to receive the fuel feed pipe 14, which is securely held therein. The upper ends of the blocks terminate in semi-circular seats which loosely rccive the blast pipe 17. Located in advance of the casing is a rectangular block 15. This member is provided with transverse openings adjacent its opposite ends. The upper' of these openings is slightly less in diameter than the lower and receives the ipe 17, which is xedly secured therein, while loosely fitted in the lower opening is the fuel feed pipe 14. The lower end of the block is provided with a ventical opening which receives a set screw 16, the inner terminal of which binds on the 'fuel pipe14. Thus it will be seen that by turning the set screw from engagement with the pipe 14 the pipe 17 may be adjusted longitudinally of the casing so as to bring the deiiector or spreader adjacent to. 0r away from the outlet of the pipe 14.

lith this constructionfit` is obvious byA loosening the set screw the pipe 17 by virtue of, the liexible tube may be adjusted in the Adirection of its length, so as to set the conical deflector at any required distance from theoutlet of the mixing tube 14, this construction will be found very advantageous where blasts of various strengths are employed.

From the foregoing it will be seen I have provided a device which is simple in structure and comparatively inexpensive to manufacture, and which may be readily applied to any form of heating furnace now 1n us.

aimee Having thus described my invention what is claimed as new, 1s:-

1. In n device for supplying a mixture of coal dust and fluid to the combustion chamber of a furnace, the combination with e furnace; of a casing arranged exteriorly of the furnace, a coal dust feed pipe disposed within said casing and a liquid blast pipe adjustably fitted Within the easing and arranged parallel withI and exterior of the feed pipe, said blast pipe being provided nt its inner end with e fuel deleetor located in the casing and having openings to permit the liquid' from the blast pipe to enter the casing at right-angles to the coal dust from the feed pipe.

2. n a device for supplying a mixture of coal dust and iuid to the combustion chain#Y ber of a furnace, the combination with a furnace; of a casing arranged exteriorly ef the furnace, a coal dust feed pipe disposed within said casing and. it liquid blast pipe adjustably tted within the casing and ai ranged parallel with and exterior of the feed pipe, a hollow fueldeector located in the cnsin and connected with the blast pipe, said fri'e deector being arranged in miel alinement with the feed pipe and having o enings to permit the luid from the blast pipe to enter the ca sin at rightengles te the coal dust from the eed pipe.

In testimony whereof, afix my signature, in presence of two Witnesses.

JOHN W. ZELL; Witnesses:

his THOMAS C. X MATLACK,

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