US988271A - Powdered-coal burner. - Google Patents

Description

A. D. LEB.

POWDE'RED COAL BURNER.

APPLICATION FILED JULY 1, 1909.

lPatented Mar. 28,v 1911.

3' SHEETS-SHEET 2.

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` POWDERBD GOAL BURNER.

APPLICATION FILED JULY l, 1909.y

Patented Mar. 28, l19111.

3 SHEETS-SHEET 3.

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ALvA 1o. LEE, OE BOSTON, MASSACHUSETTS, AssrGNOR 'ro LEE EURNACE ANn BURNER.

COMPANY, A CORPORATION or4 NEW YORK rowDEREn-COAL BURNER.

Specification of Letters Patent.

Patented Mar. as, ieri'.

Application ined' :hay 1', 1909. serial No. 505,769.

To all whom it may concern: y

Be it known that I, ALvA D. LEE, a citizen of the United' States of America, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have .invented certain new and useful Improvements in Powdered-Coal Burners, of which the follow'- ing is a specification.

This invention relates to an apparatus for burning powdered coal oit' other fuel and has .for its object the'production of la device' whereby the 4coal may {rbe constantly fed through an opening inthe furnace wall and mixed with the properamount of lair and steam for combustionfthe amount of coal fed through the device being suitably controlled while means is also provided for controlling the amount of air admitted to the furnace for the purposes of combustion.

The invention further consists in providing a vmeans whereby the opening .through the furnace may be hermetically sealed and vthus limit the air admitted to the tire-pot to that which passes through the burner.

The invention'further consists in certain ing on line 4--4 on Fig. 1:y Fig. `5 repre.

sents a section of the aspirator and its supporting plate, the burner being removed therefrom, the cutting planebeing on, line 5-5 on- Fig. 2. Figs. 6 and 7 represent, respectively, an end and side elevation of the annular boss secured tothe wall plate. Fig. 8 represents in section-the cam faces of the annular boss andthe hub of the damper, and Fig. Q'represents a section through the damper hub on line 9-9 on Fig. 2.

Similar characters designate like parts throughout the several figures of the drawings.

n the drawings, 10 represents t-he wall of a furnace through which extends the opening 11 into the tire-pot. vTo the front face of the wall l@ is secured in anyA well-known manner a perforated annularplate 12 to the central portion of which is secured the threaded annular boss 13. Screwed into the threaded opening of the boss 18 is the tubular casing member 14 to which air may be admitted through the pipe 15. Y Threaded to the interior of the casing member 14 is the tubular member 16 having, openings l 17 therein in thesame plane with the inlet pipe 18 through which steam may be admitted tothe linterior of the tubular member 16. Threaded to the interior of the member 16 -is the tubular member 19 to the outer end of which is secured a head 2O which communicates with a feed Vhopper 21 ada ted toreceive the powdered coal or other uel intended to be used in the burner. The hopper 21 ,means of a belt 26 from a suitable electric motor 27, the speed of which is controlled by means of the rheostat 28 of any wellknown construction. It is obvious that by means of this rheostat the speed of the motor 27 may be regulated` as desiredand y,as a consequence the feed of the pulverized coal or' other yfuel from-` the hopper 21. into the interior ofthe tubular member 1-9 may be controlled at will.

Beneath the Adischarge end of the hopper 21- is locatedan air pipe 29 having therein a regulating valve 30. The inner end of the pipe 29 is reduced in diameter to forma jet 31 through which the air passes into the interior of the tubular member 19 with such force as to create a blow pipe action therein, vthus causing the pulv'erized coal or fuel fed therein from the hopper 21 to be forced through the interior of the tubular member '19 and discharged from its opposite end 32.

The tubular members 16 and casing 14 are reduced in diameter at their forward ends immediately in frontof thel discharge end 32 so that the steam and air within said tubular members in passing from the outlet ends of said members will pass across the path of the discharge of the pulverized coal -or other fuel and be thoroughly mixed therewith in the mixing chamber 33 of the member 34, screwed onto the periphery ofthe casingmember 14.

Surrounding the member 34 is an aspirator 35, `Supported by means of the legs SG secured to the inner face of the plate l2.. outer face of the platelQ has mounted recess therein and smroundingv the perro rations therethrough a sheet of packing material 37 against which the perforated damper member 38 bears. This.. damper member 38 is provided with perforations therethrough adapted to register with the perforations through the plate 12. rljhe hub of the damper member 38 is mounted upon the boss 123 and is freely revoluble about the same, beingr held in position by means of 'the flange 39 formed upon said boss i3. The hub of the damper member 355 isprovided with a plurality Aof cam membersf-(l on its outer face which are adapted to engage with similar cam members all formed upon the inner Wall of the flange 39 of the'boss member 13. llt is obvious that this damper member bearing it does against the packing; z'uaterial 37 When turned about its airis lwill be pressed into the packing material by the actionv of the cam members @iO-lll actingl upon each other. The cam members 1liand fll. are so located relative to cach other that they will cooperate to force the damper of the packingr material 37 only when the perforations in the damper are out of register with the perforations in the plate 1Q. lt is obvious therefore that when the damper is moved about the axis of the burner b v means of the handle l2 to close the opening through the furnace Wall into the tire-pot that the cam action. of these members il and l1 will press the damper so firmly into contact with the packing material as to hermet-` icallv seal the opening and prevent any air from passing therethrough. Illhe damper may be moved into any position to permit the admission of a greater or lesser amount of air through the opening 1l and locked in adjusted position by means of the threaded Clamp 43.

The device provides a means whereby powy dered coal or similar fuel may be automatically forced inte the lirepot of a furnace under a or less degree of pressure and thoroughly mined at its discharge from said. devicevvith any required amount of stecn and air for combustion in a vacuum or a greater amount of air may be admitted under atmospheric pressure through a able aspirator caused 'to min with fuel and steam and air being discharge from the main portion of the burner.

,l t is obvious that bv means of the hand f the cunt of air being discharged t casi. member may be c tf le 'by means of toe handle "u l l. amount of steam beine charged from. the tubular member l@ similarly regulated. i

This apparatus provides a very means of utilising powdered fuel and trolling the feed of the the charge of the fuel to the lire-pot under vary-` conditions While at the same time it provides a readyv means of contrlling; the amount of air or steam to be mixed 'with the powdered coal or fuel as it is discharged from the discharge orifice 82. lit also pro vides a ready means of cutting off and her metically sealing the opening` through the furnace Wall or 'regulating the amount of. 'opening therein through which the air may pass through the aspirator into the fire; pot.y thus providing for every contingency which may arise under varying'conditions in the operation of the burner.

By removing the nozzle member the effect upon the powdered coal passing` from the mouth 32 of the member 19 by the impact thereon at a given point of the steam and compressed air passingI from the mouths of the members 16 and lll is to cause' it to be4 scattered and spread, getting an eifect known as ballooning.

lt is obvious that as the steam passes through the member lo at .-a high rate of speed and concentrates at a comw mon point it will distribute the powdered coal in every direction throughout the lire pot and prevent it from enteringI said lirepot in a jet flame. rlmhe distributionof thev powdered coal throughout the lire-pot produces an eoualized flame with a great in-` crease in effectiveness over any result that can be obtained by introducing the coal into the tire-pot in a jet as is now generally done.

qWhile the best results may be obtained in ballooning l by removing the head member 3&1-, it is obvious that fairly goed results may be obtained Without the removal ofthis member. the spread ofthe coal, however, loeing more limited.

lt is believed that the operation and many advantages of the apparatus thus described will be fully apparent Without any further description.

Having thus described my invention, il claimt l. powdered fuel burner of the nature disclosed combining a central tube for pro iec'ting powdered fuel, a power driven 'mechanical feeder for supplying` said tube with powdered fuel, an adjuster' for longitudinally shiftingl said tube, an intermediate pipe circumscribine1 said tube and converging1 at its extremity to forni an annular steam passage adapted to project aconver@ ing j et of Isteam into the projected stream of powderedfueliA an adjuster forlongritudinally shifting; said pipea means 4'for supplying 'the same ivith steam, an outer Atubular member circumscribine; said pipe and convefeinte;` at its extremity to form an annular adapted to project a conve nur into the streamlof commin. steanu means for suppljyii member with ai, a tip havi recess for diffusing; and discharf ico steam and air, an aspirator arranged adjacent said tip for supplying additional air, and adjustable means for regulating the action of saidl aspirator.

2. A powdered lfuel burner of the nature disclosed combining a central tube for projecting powdered fuel, a feeder for supplying said tube with powdered fuel, an adjuster for longitudinally shifting said tube to vary the proportions of steam in the combustibley mixture, an intermediate pipe circumscribing said tube and converging at its extremity to form an annular steam passage adapted to project a converging jet of steam into the projected stream of powdered fuel, means' for supplying the same with steam, an adjuster for` longitudinally shifting said pipe to vary the proportions-of air in the combustible mixture, an outer tubular member circumscribing said pipe and converging at its extremity to form an annular air passageadapted to project a converging jet of air into the stream of commingled fuel and steam, means for supplying said tubular member `with air, a tip having a bell-shaped recess for diffusing .and discharging the combustible mixture, anl aspirator arranged adjacent said tip forsupplying additional air,

and adjustable means for regulatingihe action of said aspirator- 3. A powdered fuelburner of the nature disclosed combining av central tube for projecting powdered fuel, a power-driven mechanical feeder for supplying said' tube with powdered fuel, an' air pipe coperating with said feeder for forcing the fuel in disseminated form through said tube, an adjuster for longitudinally shifting said tube, an intermediate pipe circumscribing said tube and converging at its extremity to form an annular steam passage adapted to project a converging jet of steam into the .projected stream of powdered fuel, means for supplying the same with steam, an adjuster for longitudinally shifting said pipe, an outer tubular member circumscribing said pipe and converging at its extremity to form an annulanair passage adapted to project a'. converging jet of air into the stream of commingled fuel and steam, means for supplying said tubular member with air, a tip having abell-shaped recess for diffusing and discharging the fuel, steam and air, an aspirator arranged adjacent said tip for supplying additional air. and .adjustable meansfor regulating the action of said aspirator.

4. A powdered fuel burner of the nature disclosed combining accentral tube for projecting powdered fuel. a feeder for blowing powdered fuel through said tube, an adj iuster for longitudinally shifting Said tube.

au intermediate pipe circumscribing said tube and converging at its extremity to form an annular steam passage adapted to |uroject a converging jet of steam into the projected stream of powdered fuel, said pipe having i a peripheral shoulder and being provided with a perforation rearward of said shoulder whereby steam may pass therethrough into Athe vbore of said'pipehan adjuster for longitudinally shifting said pipe,l an outer tubular member circumscribing said pipe andconverging at its extremity to form an annular air passage adapted to project a converging jet of air into the stream of commingled fuel and steam, nieans for supplying said tubular member with air, said outer tubular member having an internal fluidtight fit with the peripheral shoulder on said intermediate pipe and having a steam inlet atl the rear of said shoulder, a tip having a bell-shaped recess for diffusing and discharging the fuel, steam `and air, an aspirator arranged adjacent said tip for supplyject-ing powdered fuel, a feeder for blowing powdered fuelv through said tube, an adjuster for longitudinally shifting said tube, an intermediate pipe circumscribing said tube and converging at its extremity to form an annular steam passage adapted to project a converging jet of steam into the projected stream of owdered fuel, an adjuster for longitudina ly shifting said pipe, means for supplying the latter with steam, an outer tubular member circumscribing said pipe and converging at its extremity to'form an annular air passage adapted to project a converging jet of air into the Stream of commingled fuel and steam, :means for supplying said tubular member with air, a tip hav- -plying additional air, and a damper for regulating the flow of air into said aspirator.

6. A powdered fuel burner'of the nature disclosed combining a central tube for projecting powderedvfuel, a power-driven mechanical feeder for supplying said tube with powdered fuel, an air pipe cooperating with said feeder for forcing the fuel in disseminated form through said. tube, an adjuster for longitudinally shifting said tube to vary the proportions of steam in the combustible mixture. an intermediate `pipe circumscribing said tube and converging at its extremity to form an annular steampassage adapted to project a converging jet of steam into the projected stream of powdered fuel, said pipe having a peripheral .shoulder and being provided with an inlet to its interior real'- ward of said shoulder whereby steam may pass therethrough into the bore of said pipe. an adjuster for longitudinally shifting said pipe to var v the proportions of air in the combustible mixture, means for supplying the. W Wi'ireteam, an outer tubular member crcu-in5cribing said pipe and converging ,is erieniitjy to forni an annular nir passage adapted to project a converging jet of, air inio the Stream of cominingied fuel und eieain, ineens for Supplying said tubular member with nir, said outer tubular member hei/ing an internal fluid-tight ni; with the peripheral Shoulder on said intermediate pipe and having a steam inlet at the rear of seid shoulder, a tip having e bell-shaped recess for d" discharging the coinbnstible n i aspirator errungen jacent Seid up for Suppiying additional nir, l und e damper for regniziiing die iiow oi? air into saici aspirator.

i Signed by ine at 4 i osi; @iiice Sq., Boston, Mass., this 24th day of December, 1905i ALVA D.` LE@ l jViitnesses: ,DNA C. CLnvnL.ii\in,A i NATHAN C. LOMBARD.

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