US1401253A - Steam-boiler furnace and method of operating the same - Google Patents

Description

H. C. HEATON.

STEAM BOILER FURNACE AND'METHOD 0F OPERATINQTHE SAME.

APPLICATION FILED MAY 24, 1917.

1 1 r v Patented Dec. 27, 1921.-

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H. C HEATON.

STEAM BOILER FURNACE AND METHOD OFOPERAHNG THE SAME.

APPLICATION FILED MAv24, 1917.

1,401,253. Patented Dec. 27, 1921 3 SHEETSLSHEET 2.

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H. c. HEATON. SlEAM BOILER FURNACE AND METHOD OF OPERATING THE SAME.

APPLICATION FILED MAY 24, 19H- 1,40 1,253, Patented Deu.27, 1921.

3 SHEETS-SHEET 3- YMfl/IQVENTOR. BY na A TTORNEYS.

UNITED STAT$ Application filed May 24,

To all ill/lam vie may concern:

e it knowrrthat I, HERMAN (I. Harrow, a citizen or the United States, residing. at Berwyn, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Steam-Boiler Furnaces and Methods of Operating the Same,

; of which the following-is a specification.

1y invention relates to a furnace. arrangement for steam boilers and method of operating the same in WlllCll PI'UVISlUll 1s made for conveying'unconsumed fuel and ash from an, underfeed stoker toward the rear of the furnace chamber and there discharg ing the residue into a hopper. The present application is a continuation in part of my application Serial No. 16,538, liled March 24, 1915, for steam generators, [Patent Xe. 1,242,438 issued Oct. 9, 1917.

In'the accompanying drawings Figure 1 is a side elevation of one type of boiler containing the present improvement, certain parts in section; Fig, 2, a transverse section on the plane of the line 2--2 of Fig. 1; and Fig. 3, a view similar to Fig. 1, showing -a modified form of conveyer with another type ofboiler. Similar reference numerals indicate similar rarts the several views.

Referring to Pig. 1, the numeral 1 indicatcs a bank of horizontally inclined generating tubes connected to front and rear headers 2 and 3. These headers are connectedby tubes to steam and water drums 4. \Vithin the bank of tubes are longitudiarranged as shown in Fig. 2 furnace gases across the't'ubes, abovethe tubes and thence to the stack 6. 1n the triangular space be tween the. bank of tubes and the steam and water drums isan'econemizer 7, a feed pipe. 8 leads from the economizer to the steam and water drama I For ,the' purpose of illustrating my inwention, I have shown, more or less diagrammatically, a Taylor underfeed stoker, although any other type of unclerfeed stoker may be employed. AS shown, this comprises a series of retorts 9, all of which are connected to a hopper or hoppers 10. In

to direct the. in the space each retort 'is a reciprocating plunger which pushes the fuel nto the furnace. Between Specification of Letters Ifatent.

. tend from near the lower being broken awayand others PATENT OFFICE.

Patented nee. 27, 1921.

1917. Serial No. 170,611.

the rctor'l's are air boxes 11 from which air is delivered under pressure into the fuel pit through twyers 12. In Fig. 1, the front Jlurnacc wall 13 is shown as racked over inwardly. liclow thgunderleed stoker and in position toreceive the' unconsumed fuel and ash therefrom is aneilflless oonveyer 14, the constructimi of whichfnlay be similar to that oi a chain grate stoker. It comprises a frame supported on wheels 15 adaoted to travel on a trackway and to be moved into and out oi the furnace. The conveyor 14 may be of any well-known construction in which the grate surface is caused to travel around sprocket wheels 16 one of which is driven either tiuuously by suitable means and the conv'eyer 1s preferably of such length as to exend of the underteed stoker to the rear oi? thejeombustion chamber. The unconsumed fuel and ash from the underfeed stoker aredelivered to the conveyor 14. or chain grate stoker which latter is periodically or continuously advanced in order to feed toward the rear the material received by it and to discharge the residue at the rear. During the travel of the chain grate, combustible elements in the partly consumed fuel will be burned, the gases passing mingling with those from the fuel on the underieed stoker. At the reanof the combustion chamber is a bridge wall 17 protected by a water box 18, the discharge material falling over the rear of the grate and being discharged into a hopper 19.

The chain grate Stoker 14 may be with drawn -froni tlleiurnaee chamber, when desired, into a passageway below the furnace floor. This passageway may be normally closed by a hinged door 20.

In Fig. 3, have shown the type of B & \V boiler, comprising a bank of inclined generating tubes 21 expanded into frontaud rear headers, which latter are connected, as usual, toa steam and. water drum 22. In the modification here shown, the grate- 23 is materally shorter than that shown. in Fig. 1, and vision made .for moving it from the furnace chamber. 'In this form the grate is standard supported on sprocket Wheels 24, one of intermittently or coni the chain grate.

which is driven by suitable means and. as in r 1g..1, the ash and fuel refuse are delivered front-the lower end of. the underfeed stoker to the t'aveling g ate and by the latter the residue is carried to the rear 'of the furnace chamber and discharged into a hopper :25. bridge all :26 at the rear of the combustion chamber projects over the rear of This wall is protected by a 'water box 27 connected with the boiler circulation through the pipesZ-S and .29.

l\s is well-known, the fuel supporting surface of the underfeed Stokerillustrated in the drawings is inclined, and the fuel and ash are gradually moved to the lower end thereof. From. this point they are discharged upon the horizontal surface of the traveling grate by which they areconveved through the furnace. As they are so conveyedv any unconsumed combustible elements in the fuel will be burned, thereby effecting an economy in the operation of furnaces fired by an underfeed stoker. The

arrangement described does away with the use of dumping plates. clinker grinders and other similar devices as heretofore generally used with underfeed stokers.

The underfeed stoker combined with the chain grate stoker gives better results and higher efficiencies than would be secured through the use of other types of stokers combined with the chain grate stoker.

An uuderfeed stoker is supplied with a forced blast, and the amount of coal burned on the underfeed stoker can be regulated independently'of the suction within thefurnace chamber. The suction within the furnace chamber can, therefore. be made such as is best adapted for burning the coal on the chain grate Stoker, and both the chain grate stoker and the. underfeed stoker can be operated at their maximum elliciencies. Should any other stoker than the underfeed be used where a forced draft is not available, and the coal from the other type of stolcer fed to the chain grate stoker, the amount of furnace draft required for the other type of stoker would be. considerably more than that required for burning the partly spent coal on the chain grate stoker, and the result would be that a great amount of excess air would pass into the fup nace through the coal on the chain grate s oker and unccouomical results would be secured. The combination disclosed in the application is, therefore. one'that can be operated at higher elliciencies than would be obtained with other forms of stokers combined with the chain grate.

hat. I claim and desire to secure by Let tors latent of the United States is l. A fuel burning method comprising forcibly underfceding fuel into-the front portion of bed of burning fuel and therebc vond bodily carrying along the fuel bed derfeed stokeand a forced air blast, and a so 4.. A steam boiler furnace having an un-' travelin chain grate at the rear of the.

stoker, the. Stoker being arranged to feed fuel and ash-upon the traveling chain grate.

5.-In a boiler furnace the combination with an underfeed stoker having a forced air blast. of a movable grate u )on which the fuel and ash are dischargec, said grate being arranged to convey the residue to the rear of the furnace, a bridge wall at the rear of said chamber. and a 'ater-box for pro? tecting said wall. the discharge of the ashes being through the. space between the grate and the said water-box.

derfeed stoker and a forced air blast, an end-- less refuse removing device at the rear of the stoker, and connections for. continuously. aetuating 'said endless refuse removing deyice to discharge the residues fed thereto by the stoker. I

7. A steam boiler furnace having a com bustion chamber, an underfeed Stoker Idis posed at the front of said combustion chitinber. and a t'aveling chain grate disposed at the rear of said chamber and constructed and arranged to receive fuel and ash from the underfeed stoker in one portion thereof and discharge the refuse from another portion thereof.-

S. A steam boiler furnace having an un-' derfeed stoker and a forced air blast, and a. traveling chain grate at the rear of the stoker, the stoker being arranged to feed fuel .and ash upon the traveling chain grate, said chain grate having an air supply separate from that of said underfeed stoker.

9. 111 a boiler furnace. the combination with an underfeed stoker having a forced air blast. of a mo 'able grate upon which the fuel and ash fronrsaid stoker are discharged, said grate being arranged to convey the residue to the rear of said furnace and having an air supply separate from that of said 'underfeed stokerm r 10. In a boiler furnace, the combination with an underfeed stoker having an inclined 'bed and a forced air blas of a movable grate extending rearwardly from said i 6. A steamboiler furnace having an 'un-.

stoksr and having a substantially hd 'izontal signed my name in tile presene of two subsuruce lliponi wglchhthe (flueland ash from scribing witnesses.

sai st0,'er are isc arge said grate being 1 1 1 arranged tb convey the rsidue to the rear HhRMAN HEATON' 6 of furnace; andhaving an air supply Witnesses;

k so I ize fl'om thmfi of said gnderfeed stoken AmYs NEVELING,

testimony whereof have hereunto v A. B. CLARK.

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