US931952A - Steam-boiler furnace. - Google Patents

Description

QW. G. MUNSON. STEAM BoILER'FUBNAcE. APPLIOATIONPILED MAY 25, 190B.

Patented'Aug. 24, 1909.

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W. G. MUNSON. STEAM BOILER PUBNACB. APPLICATION FILED MAY 25, 1908.

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Patented Aug. 24.1909.

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PatentedAug. 24, 1909.

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W. G. MUNSON. STEAM BOLER FUENAGE.

APPLoAToN FILED MAY 25, 190e.

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' To all whom it may concern:

lVIarion and State of Indiana, have invented certain new and useful improvements in Stea1n-Boiler Furnaces; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to. which it appertains to make and use the same.

, My invention Vrelates to furnaces for steam boilers and has particular application to certain improvements in furnaces for feeding air and returning smoke' and gas by the same air feeding force for promoting combustion g and the invention consists lin the construction, combination, mode of operation, and arrangement of parts set forth in and fall'- ing Within the'scope of the appended claims.

The objecto my invention is to promote the combustion of the tire-bed, Jrevent the clinkerin and crusting thereof, and supply thereto aundance o f artificial fuel to produce tliebest results from the heat in the production of steam, with complete control of the furnace, and in preventing the Waste of fuel. v

In the accompanying drawings l have illustrated one embodiment of the invention and in Which- Figure l shows in eleva-tion a steam boiler and its setting embodying my invent-ion, the smoke-stack in partial section to expose the device by which lthe product-s or" combustion are'collected therein and delivered therefrom into-the ash-pit. Fig. 2 shows iu sectional elevation a steam boiler and its settingI embodying my invention, in feeding' air above, and the products of combustion below the Lgrate for promoting combustion by the same air supply force. Fig'. 3 .is a horizontal section of the same taken through the iteededoor and showing` a grated and a non-g ated coinbustion chamber, divided air conc. `i

es in the Walls surroundingi these chambers. air periorations in the surrmindingl Walls of the latter above the grate, and air injector nozzles entering the conduits: Fie". l is an elevation of the rear end of the iurnace showing` the pipes for feeding air and the smoke and gases for promoting combustion.' Fig. 5 shows in enlarged vertical section a portion oi' the smoke-stack and a plurality of .cones -arranged across the smoke-stack, whereby air under pressure is caused to be mixed Specification of Letters Patent. ,fr @Lent-@ii Aug. Lil.

Application filed. May 25, 1958. Serial No. sensei.

with the escaping products of combustion Within the smokeestack and expelling the mixture into the ash-pit. Fig. 6 is a View in 'perspective of the interior Wall of one side of the bridge and a portion of' the connecting' side Walls of the combustion chamber and the ash-pit showing the Wall air receiving conduits the perforations in said Walls and air delecting lips overhanging the said perforations :for preventing the air jets from passing` upward over the Walls into the combustion zone. Fig. 'T shows in vertical'section a. detail of the conduit through which the products of combustion mixed with air under pressure are both forced and drawn from the smoke-stack vand injected into the ash-pit, and the steam heating coil` in said conduit. Fig. 8 represents in sectional elel vation a steam boiler and its setting as a complete structure embodying' my invention including an air compressor and an air` storagetanl which necessary elements in carrying out my invention for supplying air under proper torce and volume to the airt'eeonig smoke returning devices.

The boiler l is si two combustioii -cha ibeia one il, of which bers occupy the boiler and are ab plane. The grr beneath the front end o the boiler and has the usual feed-floor 5, and the ash-pit 6;l while the noi ed chamber terminates in the arched up nace. The rl .nbers are divided by a bridge-Wall o t at Vthe products of conihustion Afrom the grated chamber oi er the lnldg'rall and over and into the ungrated cnber into which they are mixed with h'k/ .-.f heated expanded air and from thence hie llame produced thereby passes into and through the arched uptake into and through the boiler-nues, into the usual smoke boit and into the smoke-starli- -Ui ii divided conduit for oir rm-dercompresitire space beneath the on the same horizontal d combustion chamber is which it passes into the expansion division from whichy it passes into the combustion cion in scplled SPaCQS is?.

ed upon Walls over e 7 at the rear of the fun will presently state.

l ing both sides of the bridge-wall and the intersecting end conduits 13--1/t, so that the air in the conduits will be caused to pass therefrom in a highly heated condition by means which I shall presently explain, into '#15 the combustion chambers and thereby pro- Amote and maintain a high heat beneath the `boiler. The perforations are preferably madea quite close together' and may be so formed as to cause the air jets to be delivered at opposite or divergent angles horizontally into the combustion chambers to give an even distribution and, as a result, a more uniform combustion. For this purpose I may make V shaped perforations aly ternating with perforations at right angles to the chamber walls with the branches of the V opening into the chambers so that the air jetswill be caused to mix with the bodyf of the fire on the grate. An' important feav ture in connection with these perforations is the `forming ofyrecesses 15, in the inner walls of the combustion chambers and on both sides of the bridge-Wall the recesses terminating at their upper ends in deflecting lips 16 which overhang the upper row of the perforations and thereby cause the air jets therefrom to be deflected downward and prevent them from being drawn up and along the vertical walls of the combustion 40 chambers the air-jets thereby being practically confined 'to the iire-bed.

It will be noted referring to Fig. 3 that the air'conduit is divided centrally of its width 'by a partition 17, which extends nearly the length of the walls of the combustion chambers, the function of which partition is to divide the conduit into a space 18 next to the outer side wall, into which air under pressure is injected, and a corr/.iranieating space 19 next to the chamber walls into which the injected air is expanded before it passes through the perforations into the combustion chambers. The partitions are separated or interrupted at'the bridge -5.5 conduit, so that the air will pass from the outer space 18, through the space 20, between the ends of the partitions, into the inner expansion spacesl 19, formed by the Apartitions, into the cross conduit 21, of the I30 `bridge and into the end cross conduits lf3-14.

Removable partitions 27 connect the rear ends of the partitions to the rear Tall, so that the 4air under pressure entering the conduits attheir. ends will be caused to pass along the outer sides of these partitions and caisse by ba'ck pres' 1re return in the spaces 19, and

into the cross` spaces, so,that in use the outer 'conduit spaces are always filled with air under pressure; while the inner spacesvare filled with air under less force and which it will be understood, is constantly supplied fro'm the outer spaces into which the air is received frol n-a source of supply under pressure. i v

The provision for supplying the wall conduits with air under pressure consists, in the construction shown, of a branch-pipe 28 connecting a supply-pipe 29 referably at a point betweenrithe source of) the air su ply and the smoleestack, 'and extendin rom such connection to the rear of the rnace,

has a dupreorv4 aralnch each branch 30 termihating in anozzle 31 which, piercingpreferably the rear fornace wall, extends within each conduit space 18 between its uter wall and the partition so that the nozzle terminates in lapping relation to the latter, and

thereby injects the zur under pressure into the outer conduit spaces from which it is expanded into the inner conduit space and thence into the combustion chambers.` For this purpose the branch-pipe 28 referably enters the wall of the main supp y-pipe 29, the air Afrom which is detiected into the branch pipes by hoods 32 which are placed over the entrance to said branch pipes and extend into the main supply-pipe. As adjuvant to the air supplied by these nozzles I provide the branch-pipe 28, with a branch*- pipe 33, which enters the Wall of said pipe 28, and is bifurcated so that its partsl 34-34 straddle the boiler as in Fig. 4, and, passing down through the side walls, terminate in injecting nozzles 35 in the outer spaces 18 of the wall conduits that is, between their outer Walls and .the partitions, on each side of and about mediately of the len h of theV grated combustion chamber. similar branch-bifurcated. p1pe 33, is provided for the non-grated combustion chamber and is shown in Fig. 2'as connecting the branch pipe 28, and straddling the boiler, its branches 3-l-34t passing down through the side walls and terminate in injectin nozzles 35, in the outer spaces 18, of thewa conduits on each side of and about mediately ofthe length'- of the non-grated combustionchamber.

Each brunch of the bifurcated pipes is provided with a cut off cock 50 and it will be force to supply the tire-bed. The advantage .120 understood, thaty all 'the'air pipes may be .used together or controlled as may be de-.

'perforations mixing with the smoke and gases from the fire-bed, produces flame of intense'heat which passes directly into the boiler fines.

In the event of the air compressor becoming disabled from any cause Ii provide 'an emergency means whereby aii under atmospheric pressure may tireV supplied to the conduits and referring te Figs` 1 3 and 4 this construction is scenes consisting ofthe' doors 11, at the end walls of thefurna'ce which, when opened, supply air to the conduits at both ends., 'Registers 37 which" open at the side Walls and which lead to ducts 38, therein down to and open into the outer conduits,` also provide for the inflow of air therein, there being for this purpose preferably a pairy of such registers and ducts provided for each side of each combustion-chamber. YVhen .the furnace is operating under a forced draft these doors and registers are closed.

rlhe bridge Wall is provided with passages 51, leading from the cross air conduits to a.

door 52, in the ash-pit as in Figs. 2 and 6' 'wherein it will be seen that the bridge Wall is hollow, and that the partition therein is supported upon blocks 53.

The feed door! and the ashpit door, and

the clean out doors, are closely fitted and closed at all times when the furnace is Working With a forced draft, .and when so working the partitions 27 crossing the ends of the rear end cross conduits are removed.

to allow the hot. air from the end'conduit to come 1n Contact with and heat the injector nozzles.

To give greater efficiency to the heating.

capacity of the furnace I employ the direct draft produced by the air compressor sup ply-'pipe in connection with a smoke and gas exhausting device mounted Within and extendingv across the smoke-stack draft by `which the products of combustion passing with the draft are intercepted and collected in a zone across the smokestack, mixed therein with the forced air and delivered iiito the ash-pit, lso that one'source of forced air effects under the-'same pressure the separate and distinct: functions of supplying air to the fire-bed Vabove the grate, and of ex'- llausting the products of combustion from the smoke-stackand delivering them beneath the grate and this operation is eected by the following means. The main air supplydevice for checking the outflow of the smoke and gases, collecting them and expelling them mixed with Athe 'expelling air succes` sively from said cones into a pipe 39 Which connects With vthe smoke-stack and extends to and opens into the ash-pit, whereby practically all the smoke and gases that Would pass out of the smoke-stack are taken therefrom andforced u through the grate to promotecombustion. For this purpose a group of tubular sections 40 preferably of conical form are arranged in lapping relation to each other with the flaring. ends of each opening into the smoke-stack and their smaller ends opening into the flaring ends, so that the smoke and gases are, by the entraining action of the air caused to be sucked simultaneously into theflaring end of each cone, by the force 'of\` thejair passing through a central condiiit'coniposed ofitubular lapping sections 41 and connected in such manner as to cause each cone to form a suction zone in the draft space, the effect of which. is to cause the smoke and gases to be drawn Within the cones and mixed with and ejected therefrom by the force of the incoming air. -T he initial cone, laps within the stack Vivith the end of the air supply-pipe; Awhile the terminal cone, laps Within a mixing hood 42 projecting from and secured to the outer Wall of the smoke-stack. The sections forming the central conduit lap with each other preferably' at the lapping ends of the cones so that annular spaces 43 are formed between the lapping ends of said central sections and open into the flaring ends of the cones. Preferably the cones decrease in diameter from the intake tov the exit conc, and the central con-` duit sections are correspondingly decreased and this construction has the effect of giving the device the function of an ejector, the action of which causes the air which is forced through the central conduit and through each cone to draw the smoke and gases from the smoke-stack into the flaring end of each` cone in the direction of the air flow and into y-,smoke and some of the gases from the smokestack into the' mixing-hood. A pipe 39 connects this mixing-hood and, passing down through the side Wall opens at 45, into the ash-p1t and delivers therein the mixture of smoke, gases and air. To give'such delivery the force of an injector a branch-pipe 46 is connected With the main air supply-pipe between the source of the air supply and the smoke-stack, and passing down and into'the side Wall enters the wall of' the pipe 39, which leads from the mixing-hood and terminates a suitable distance above its outlet. In this action of the central sectional conduit and separate 4cones the smoke and gases are taken from the smoke-stag k and mixed With air in the hood into Whi l the central air conduit terminates.

The exhausting device is kept firmly in line and supported at its inlet end upon the end of the air supply-pipe by strips 48, andat its exit end the device is supported Within the mixing-hood by strips 49, the group of cones being connected and supported upon each other and upon the central sections by like strips; While the central conduit sections are supported in separated relation at their lapping ends by like strips so that the air has free passage through the central conduit' sections, through the spaces 43, between'their lapping 'ends and through the cones keeping al-l the passages clear and causing each cone of the group to form an individual ejector Within the smoke-stack; While the group as an entirety forms a partial vacuum across the smoke-stack. The number of the cones may be varied to suit the diameter of the smoke-stack but of Whatever number and form, their arrangement must be such as to cause a plurality of transverse drafts inl will have transverse openings in commun1- cation with the stack draft space, while the inner group of sections Will form an air conduit and have transverse openings in communication With the outer sections.

Coperating with the external mixinghood which opens into the smoke-stack a supplemental hood 54, is fixed to the inner Wall ot' the latter in overhanging relation to the upper edge of the external hood so as to arrest and cause the deflection of the products of combustion Whichmight pass4 the vacuum producing' device, into the external hood. As a means of causing the arrest ot the `stack-dra ft the flaring 'end of each outer section ofv the partial-vacuum rroduciiig device is projected toward the in etl end-or' the compressed air supply-pipe so that at its upper` edge each section will overhan its lower edge and thus assist the suction unction of the central conduct and increasetlie exhaustingl capacity of the device. lin the mixing' function of the hood it is also caused to produce a partial vacuum at the receiving end of the smoke-pipe and to cause the extension ot this partial vacuum into the smoke-pipe I provide it near the outlet of said hood with a contracted neck 55 of ccnical form and having the function of a nozzle and producing thereby a more acute artial vacuum at the entrance of the smoke-pipe.

It is important that the mixture ejected from the smoke-stack be as highly heated as possible before it is delivered into the ash-pit, and for this purpose l utilize steam preferably taken from the boiler dome by a pipe 56 Fig. 2 leading to and entering the Wall of the smoke-pipe 39, and connected Within said pipe to a coil 57 which surrounds therein the air-branh-pipe 46, and passes out of said pipe 39, into the ash-pit.,

This steam coil heats the air passing from the compressor to the smoke-stack and to the ejector pipe 46; while the delivery of the steam Withinthe ash-pit serves to further heat the mixture therein and to agitate and eiect its complete mixturelbefore it passes up through the grate into the lire-bed, as the steam will leave the coil under pressure and spread beneath the grate, and the ashpit being air-tight, the mixture fed to the re therefrom will be smoke, gas, air and steamj1 the steam pipe for that purpose having a regulating valve 58, Fig. 8. lllhe steam coil does not contact with the inner WallsA of the smoke-pipe and is of a size to give free passage therein to the products of combustion.

-I find in practice that the ordinary blower used as an air-compressor Will not produce the required air pressure for the stacksmoke exhauster and for all the air and smoke-pipes, or a uniform pressure in all the pipes and particularly in the conduit in jecto. s and to overcome this objection It supplement the air-compressor with an\ air storagetank 59 located between the air-'cbmpressor 60 and the smoke-'stack which tact only provides for the required pressure, and volume but serves as the means b which such pressure maybe made fr pre ominate' over the air and sn1okepipes by the pro- 25' these are. referm vision of a regulating gate S2 in the pipe 29, which connects the storage-tank with the exhausting device kof the smoke-stack. The pressure in the storage-tank is indi ,ated by 5 agage 63. To obtain the full advantage in the use of the storage-tank provision is made by a coiled pipe tether-ein having connection (not shown) with the steam space of the boiler, for heating by radiation from the coil, the air stored in the tankso that the air that supplies all the pipes is rst heated in the storage-tank, then .in the smoke-stack exhausting device, then in the sinoke-pipe lead ing to the ashpit, then the ash-pit, then v by the heated ivalls of the conduits Whicn surround the combustion-chambers, and in this 'Way the force of the air is reduced before its eri'snce inte the fire-bed, the supply .in ash-pit being always stronger than that delivered into the combustion chambers, and

cross conduit and return under less force in the other side 'of the saine conduit and be caused to be highly heated in its course and to-be fed through the perforations into the combustion-chambers; that the air from these horizontal injectors is under greater .pressure than the air from the vertical injectors and therefore the return dow of the air in the conduits is not interfered with; that the feeding of an in this way will 40-A produc'e an a proximately white heat in the combustion-c iambers; that 'the several air and smoke-pipes are provided with control lin cocks 50, by which' f iill control may be i hadY of the pressure and,r supply; that the branch-pipe etti, serving/as an air injector' forthe smoke and gases'is heated in the pipe 39, by which they are conducted to and delivered'into the aslrpit; that this injector air branch-pipe Aaids 1n produc-ino' a partial vacuum in the smoke delivering pipe and also assists in foianing a stronger partial vacuum in the exhausting cones; that the vair, smoke andv gases, are mixed in the hood v of the exhausting device practically Within the 'smoke-stack and again mixed in the delivcrin j pire by the branch-pipe 46, and that t is branch-pipe prevents any back ressure of the mixture; that from the forced draft and mode of promoting coinbustion, the smoke-'stack need not iextend more than fifteen feet out of lthe rodf of a buildin that the controlling cock 'in the smoke delivering pipe serves to out ofi" any back draft through to the smoke stack in 'ease the air-compressor or engine may be out of uorkiiig condition; that by the provision of the controlling cocks, air at atmospheric pressure may be supplied to the Wall con-- duit-s through the end doors thereof, ,which also afford access for cleaning out the conduits; that in such case the smoke exhausting device is rendered inoperative While the my improvement l do not Wish to be limited to the precise details herein set forth', inasmuch as minor changes in the form, proportion, and exact manner of assembling of the parts may be made Without departing from the spirit of the invention. Nor do l Wish to be confined to the use of the duplex coinbustion chambers as some of the features of my invention could be used with the grated combustion chamber only.

lt is important to note that the force and capacity of the exhauster be effectively maintained to insure the most complete exhaustion of the smoke and gases from the smoke-stack and for this purpose the exhausting device is rendered functional by the joint action of three forces which together insure the effectiveness of the exhausting device in diverting substantially all the smoke and gases from thesinoke-stack. For this purpose the injector in the receiving end of the smoke-pipe coperates With the injector in the delivering end of said pipe, the tivo ejectors acting with a suction force upon the delivering end of the exhauster and the storage-tank acting with a driving force in the same direction upon the receiving end of the exhauster.

fxcept for the purposes of the combination of devices herein set forth in the claims, l do not in the Letters PatentV to bc issued on this application' claimreturning smoke for promoting combustion by means of an exhausting device comprising a plurality ofV hollow cones mounted in the Walls of the smoke-stack across the draft-space and an air conduit of lapping sections extending centrali throuGh the cones the cones and .Y Y a; 7

` and leading to the ash-pit, asthe said invention constitutes the subject .matter of claims in a divisional application filed by me on December 1., 1908 under Serial Number 465,54for improvements in smoke and gas consuming furnace; nor do-I claim herein the features of construction whereby the function of the storage-tank is reinforced by an ejector Within the receiving end of the smoke-pipe and an ejector Within the delivering end of the said pipe.

i claim-' 1. The combination in a steam -boiler furnace, a grated and a non grated combustion-chamber, a bridge-Wall dividing the combustion-chambers, the Walls surrounding and forming the combustion chambers having conduits which are divided longitudinally into separate communicating passages, and the said chamber Walls having perforations opening into the inner assagesbf said conduits and into said cham ers, and means for forcing air into a division of the conduits.

2.' The combination furnace, a grated and a non-grated combustion-chamber, a bridge-Wall dividing the combustion-chambers, the Walls surrounding the combustion-chambers and the bridge- Wall provided With .separate parallel communicating conduits or passages, one of said passages having perforations, opening into said chambers at their'sides, ends, and at' both sides of the bridge-wall, and means for forcing air into the other passage of the conduit from which it enters into the combustion-chamber.

. 3. The combination in a steam-boiler furnace, a grated and a non-grated combustion-chamber, a bridge-wall dividing said chambers, the Walls surrounding said chambers provided With communicatlng conduits having perforations opening into said chambers, the side conduits being divided longitudinally into communicating spaces, a pipe leading from a source of vcompressed air supply and having connections extending to, entering and `terminating in an injecting nozzle Within a division of each conduit at one end of the furnace, and cocks in Asaid pipe connections for controlling the volume and regulating the force of the air injected into said divided conduits.

in a steam boiler under com ression injected into the conduits on" one si e of their dividing partitions is in an injecting nozzle Wit in aidivision of said conduits at one end of the furnace, a branch-pipe having communication With sai( air supply-pipe and extending down on eacl -side of the boiler,'terminating in a noz le Within the conduits -at each side of the vcombustion-chamber, and cocks in vsaid pipe connections for controlling the-volume and re lating the force of the air injected into sald conduits.

6. In a steam-boiler furnace, a grated and Va non grated combustion chamber, the walls surroundinr said chambers provided with longitudina ly divided communicating conduits .having perforations opening into said chambers, a pipe leading from a source f compressed air supply and pipe connections therefor extending to, entering and terminating in anI injecting nozzle Within adivision of said conduits at/one end of the furnace, independent inea/ns for sup lying air from the main supply-pipe to an Within adivision of/the conduits at each side of the combustion-chamber, and cocks in said pipe connections for controlling the volume and regulating the force of the air injected into said conduits.

7. In a steam-boiler furnace, a grated comlmstion-chamber, the Walls surrounding saidy chamber and the bridge-Wall having air conduits and perforations opening into said chamber, partitions dividingleach conduit into communicating spaces into lone of which the Wall perforations open, an air injecting `pipe terminating in an injecting nozzle within each conduit between the partition and the outcr Wall of the furnace, and means for feeding air under pressure to said nozzles.

S. ln a steam-boiler furnace, a ated combustion chamber the side Wal s forming which provided with conduits and having perforations opening into said chamber, par: ttions dividing each conduit into commu-I. nicating passages into one of which theshid perforations open, the said partitions each having a removable section at the inlet end of each conduit, anjair'injecting pipe ter- .minating in a nozzle Withinthe end'of ,the outer passage, and means for eeding air to said nozzles.

9j The combination in a steam-boiler furlcombustionrhamber the Walls outer Walls surrounding which are divided longitudinally into separate communicating passages, 'and the said chamber Wallshaving perforations opening into the innerof the divided passages, means for injecting air horizontally into one end of each of said inner passages, and means for injecting air under pressure ver" cally into the same passages.

a non-grated combustion-chamber the outer side walls forminnr which provided with conduits extending iorizontally the length of said chambers and having perforations Iopening horizontally into said chambers, a bridgei wall dividing said chambers and having a passage through it in communicationv with said side wall conduits, the opposite sides ot' the bridge-wall having perforations open ing into said chambers, the said chambers and bridge-wall having recesses into which said perorations open, and an imperforate lip continuous around and overhanging said perforations with a downward defiecting under wall, Aand means ior feeding air into said conduits.

l1. In a steam-boiler furnace, agrated and a non-grated combustion-chamber the walls forming which and the bridge-Wall having air conduits extending to and opening at each end of the furnace walls, a. door closing each end opening, the said conduit `Walls including the bridge-wall having perforations opening into the chambers on a plane above the grate, and registers in the vertical walls on each side of the boiler, each register having an air-duct extending to and terminating Within the conduits, said registers be-- ing on each side of each coinbustion-chamber.

i2. In a steam-boiler furnace, a grated combustionchaniber the walls forming which having' conduits side by side each having free connnunication, that conduit which is next to the chamber having perforations opening' therein, the two outside conduits each -opening at the end walls, and doors closing such openings, whereby air under atmospheric pressure may be admitted through said'end openings into said conduits heated and passed through said perforations into the combustion-chamber.

13. In a steam-boiler furnace, a grated forming which having conduits side by side each having free communication, that conduit Wall which is next to the chamber having perforations opening into said chamber, an injectornozzle entering the end wall4 of each of the outs side conduits, and means for supplyin air under compression to said in'ectors', w ereby the outer conduitreceives he compressed air and freely supplies it to the inner conduit which thereby is causedA to have the lO. In a steam-boiler furnace, a grated and' function of an expansion-chamber from which the air is supplied to the combustionchamber for the purpose stated.

14. In a steam-boiler furnace and in combination, a grated and a non-grated cornbustion-chamber the Walls forming which having conduits side by side in free coinmunicat-ion with each other and the ,Wall of the inner conduitl having perforation-'s opening into said'chambers, an injector'fnozzle entering the non-perforated outer conduit, branch-pipes terminating each Within said outer conduit, and stop cocks in said pipes, whereby the air supplied by the injectors is under greater pressure than the air supplied by the branch pipes to said.` conduits, substantially as described.

l5. In a steam-boiler furnace and in combination, a grated and a non grated coinbustion-chaniber the walls forming which having conduits side by side in free com- 'munication with each other, the Wall of the inner conduit having perforations opening into said chambers, an ejector nozzle enter-` ing the end iv'al'l of'each outside conduit, air supplying pipe connections for each injector nozzle, branch pipes connecting said air supply pipe one for each combustion-chamber and terminating each within the said outer conduit, said pipes and injectors supplying airV under pressure to said conduits, a smoke and gas exhausting-device Within the smokestack, an air compressor, and a storage-tank connecting the exhaust-device With the stor' age-tank, a pipe connecting the exhaustfde vice with the ash-pit of the combustionchainber, and stop-cocks in said pipes Whereby the air supplied by the branch-pipes to said conduits by the injectors is under greater pressure than the air supplied by the branchpipes to said conduits substantially as described for the purpose specified.

16. I n a steam-boiler furnace, 'a combusf tion-chamber, the ash-pit, and a smolrc-staclr, a smoke and gas exhaustingdeviceacross the smoke-stack, an air supply-pipe connecting 4 the stack with the exhausting device, an airstorage tank connected to the air supplypipe, an air-compressor connected to the storage-tank, a pair of injectors in communicavtion with the combustion-chamber and with iis the supply-pipe, a pipe connecting the injectors with the supply pipe, and a pipe con necting the exhausting device With the ashpit, whereby the air supply force for the exhausting device, the combustion-chamber and the ashit is provided by the saine vol-` ume and un er the same pressure.,

17. In la stea1n-boiler furnace, the following'instrumentalities, a combustion-chamber, the ash-pit and the smoke-stack, a smoke and gas' exhausting, device across the smokest-ack, an air supply-pipe connecting the stack with the exhausting device, means for supplying air under compression to -said pipe, a pair of injectors, means for connecting the injectors With the combustion-charnhei', a pipe connecting the injectors with the air supply-pipe, und n pipe connecting the exhausting device with the ash-pit, the said injector connecing pipes being connected to the nir-supi'iiying-pipe in advance of its connections with the exhausting device, whereby the feeding of (he air to the injectors and to the exhausting device is effected from/then@ same nir supply under the same pressure.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WILLAM GURLEY MUNSON.

Vitnesses CHARLES R. Yoim CECILIA A. BEACH.

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