US2489217A - Mechanical oil burner with fluid atomizing means - Google Patents

Description

NOV. 22, 1949 c, w, G 5 0N 2,489,217

MECHANICAL OIL BURNER WITH FLUID ATOMIZING MEANS Filed Sept. 50, 1946 3 Sheets-Sheet l Nov. 22, 1949 c. w. GIBSON 2,489,217

MECHANICAL OIL BURNER WITH FLUID ATOMIZING MEANS Filed Sept. 50, 1946 3 Sheets-Sheet 2 Nov. 22, 1949 c. w. GIBSON 2,439,217

MECHANICAL OIL BURNER WITH FLUID ATOMIZING MEANS Filed Sept. 30, 1946 5 Sheets-Sheet 3 Patented Nov. 22, 1949 UNIII'IED- ES OFFICE MECHANICAL OIL BURNER WITH FLUID ATOMIZING MEANS of Massachusetts Application iseptemberxlw, 1946;. serial No. 700,272

I 9 Claims. .1.

The presentinvention relates. to fiuidburners, and more particularly to. a. rotary reaction. type burner adapted for-association withia boiler. or furnace and whichmay. employ a fluidmedium for assisting in the atomization. of a. fiuidLor colloidal type fuel..

It is not new in the rotary burner. art to. provide a rotary burner whichis particularly adapted to utilize a gaseous atomizing agent for assisting the burners mechanical means in theatomization of fuel. However, none of. these prior burner units have been provided with. any simple and efficient means for. controlling. the ratio between the quantity of. fuel. and the. quantity of atomizing agent supplied to the burner head. Such-prior burners have usually been constructed with a pair. of handactuated valves, one valve for controlling the quantity of fuel and. the other for controlling thequantity ofatomizing agent delivered to the unit. As a consequencethe efficiency of these. burners depends upon the skill of the operator in properly balancing thequantitles of the twovfluid mediums deliveredto the burner.

Also theprior art-burnersof. the above-described: type have been provided-withtmeans .in

the form of nozzles-:locatedat the: centenofthe burner head for the purpose ofvmixingtthe fuel and the fuel-atomizing agenteprion' to conducting the admixture to? the reaotionnozzles which have been located about the? periphery of the burner head. With-this typepof construction-it has been found that the fuel;oil. tends to separate. from the admixture of. oil and. atomizing medium and the oil, therefore, delivered. to the reaction nozzlesuirra partially liquid state instead of man atomizedcondition. This is: for the reason that the rotary burner head functions as a centrifuge which tends'tothrowthe heavy liquid out towards the periphery thereof ahead of the compressible atomizing medium which in most cases has been steam. Whenever this condition has arisen the entire advantage of using an atomizing agent with such a burner head diminishes.

It is, therefore, a primary object. of. thisinvention to provide a rotary fluid burner withlmeans whereby the quantities of. fuel. and fuel-atomizing medium suppliedto the burner head. may

be controlled efficiently by asingle hand-.actuated valve.

A more specific. object of. the present invention is to provide. such. ahrotary burner. unitwith means whereby the correctouantity of. fluid. is

suppliedautomatically-to the-burner head by merely metering. the quantity of: fuelatomizing medium: delivered. tov the .unit.

.Another. object of thevpresentz invention. is-to providea rotarytype. burner with means whereby- 5 the fueland fuel-atomizing. mediummay befirst mixed atca point adjacent the reaction nozzles thereby to obviate. the possibility .of the fuel separating. from the admixture before it is delivered. to. the. reaction nozzles.

With the. above and other objects in view, as will. hereinafterappear, the invention comprises the. devices, combinations and arrangements of parts; hereinafter set forth and illustrated in the accompanyingv drawings of a preferred. embodiment of the invention from which the several features. of the. invention and the advantages. attained. thereby will readily be. understood by those. skilled in. the art.

In. the accompanying drawings:

Fig. 1. represents. a. side elevaton of a rotary type burner in'which. oneform of the presentv invention is. incorporated.

Fig. 2 represents a..portion:of..a front elevation view of the burnersunit illustrated in Fig. 1 and. 5 taken substantially along line.2--2. of. Fig. 1.

Fig. 3Irepresents a view of theburnerunit taken.

substantially along; line. 33 of. Fig, 1'.

Fig. 4 representsa sectionalview. of the burner unit taken substantially alongline. 4-4..0f Fig.1.v Fig. 5 represents. an enlargedtop plan. view,

partially in section, takensubstantially along adapted. forburning liquid oil. or a solid fuel in.

colloidal suspensiomand. which utilizessteam for an atomizingagent is. illustrated in. Fi s. 1. to-Fa of. the. present drawings.

Referring particularly to Fig.1, aprefer-red form of. the. present. invention. is. incorporated in a burner unit comprising, a substantially cylindrical casing Ill.whichisadaptedto.be connected as. at H. with. a. furnace or boilerunit. 12.. A.

55 journalboxor jacket 13 is rigidlywsecured.Within.

the central portion of casing 10 by means of spider legs l4 (only one of which is shown herein) which project radially from said journal box to be secured by means of bolts E5 to an annular flange portion l3 of said casing I6. This journal box 13 is cored, as at points If, thereby to form a hollow jacket for receiving circulating cooling water which may gain entrance into the jacket by means of an aperture 16 provided in the bottom of the jacket. A water overflow aperture I9 is provided in the top portion of the jacket. The journal box is hollow and is provided at its opposite end portions with openings which are adapted to receive spaced ball bearings 26 and 2| in which is rotatably journaled, coaxially of the casing II], a tubular shaft 22. A tubular spacer sleeve 23 functions in conjunction with enclosure plates 24 and 25 to retain the bearings 26 and 2| in their proper positions. These enclosure plates 24 and 25 are each secured to the journal box ill by means of a 'bolt 26. Mounted about the shaft 22 are a pair of circular shield members 21 and 28 each of which is associated with a respective one of the enclosure plates 24 and 25 and thereby functions to prevent the egress of oil from the journal l3. The shield 27 abuts against a shoulder 29 formed about the shaft 22 and thereby functions in conjunction with the shield 28 and a locknut 30, threaded upon the rearward portion of the shaft 22, to retain the shaft 22 in its proper position within the journal box 13. It is to be understood that the locknut 36 may be tightened against the shield 28 thereby to draw the members '21, 23 and 28 against the inner recesses of the bearing members 26 and 2i.

The hollow portion of the journal box l3 forms a chamber 3! which functions as an oil sump to which oil may be added through a conduit 32 which is connected to the journal box as at 33.

Mounted upon the rearward portion of the journal box I3 is a housing 34 secured to the journal box by means of a plurality of bolts 35 (only one of which is disclosed therein). Disposed within and coaxially of the tubular shaft 22 is a second tubular shaft or steam conduit 36 which at its rearward end is provided with a spider member 3'! which spaces the conduit 36 from the inner walls of the shaft 22 thereby to form a fuel-conducting passageway designated generally by the numeral 38. The extreme rear portion of the conduit 36 is rotatably disposed within a sealing sleeve 39 mounted within a bushing 46 which in turn is rigidly secured within a chamber 4| provided within the housing 34. A look screw 42 secures the bushing 46 in the proper position within the housing 34. Thus, the rear end of the steam conduit 36 opens into a chamber 43 provided within the housing 34 and which chamber is closed at its rear end by means of a threaded block 44. Steam or other atomizing medium for the present burner is supplied thereto under pressure and gains entrance into the chamber 44 through a conduit 45 which is threaded into the member 44. A firing valve 46 functions to regulate the quantity and pressure of the steam received within the chamber 44, and this valve is in turn connected, by means of a conduit 41 to a source of steam which is not herein shown. This steam, upon gaining entrance into the chamber 43 is directed under pressure into the conduit 36 and thereby is directed towards the forward end thereof.

Surrounding, but not actually engaging the rear portion of the shaft 22 is an oil seal in the form of a steam labyrinth 48. This steam labyrinth comprises a sleeve member the inner periphery of which is provided with a series of spaced annular grooves 46 and a single master groove 56 which has communicating therewith a radial bore 51'. The present labyrinth member 48 functions to prevent any fuel from escaping from the chamber 4| and around the shaft 22. In order to accomplish this object, some steam is bypassed from the chamber 43 into a radial bore 52 provided in the housing 34, which bore communicates directly with a longitudinal bore 53 also provided in the housing 34. The forward end of the bore 53 communicates with a second radial bore 54 which functions to direct the steam about the labyrinth member 48 by way of a clearance portion 55 provided within the member 34 and about the labyrinth 48. This steamenters the radial bore 5| and then is conducted from the master groove 56 into each of the circular grooves 49 in which the steam will condense thereby effectively to block the passage of oil from chamber 41 of the housing 34 about the shaft 22. Bolts 56 secure the labyrinth sleeve to the housing 34. For a more detailed disclosure of this labyrinth device, reference may be had to my prior patent application entitled Rotary fuel burner with removable fuel-conducting means, Serial No. 681,518, filed July 5, 1946, now Patent No. 2,473,945, granted June 21, 1949.

Mounted upon the forward end of the shaft 22 is a collar member 5! which is welded to the shaft 22 as at 58. It is the function of this collar 51 to secure a rotary burner head, in the form of a fluid distributing disk, upon the outboard end of the shaft 22. More specifically, this collar has secured thereto, by means of bolts 59 (only one of which is shown herein) a disk-like manifold casing 66. This manifold casing 60 is mounted coaxially with the axis of the casing l6 and its diameter is substantially less than the inner diameter of the casing 10 thereby to form an air passage therebetween. Spaced about the periphery of the manifold casing 60 are a plurality of fan blades 6i the outer portions of which extend into the passageway provided between the manifold casing 60 and the casing l0. Referring particularly to Fig. l, the manifold casing 60 is provided with a hollow manifold chamber 62 in which is disposed a baffle disk 63. This baffle disk has provided about the periphery thereof a flange 64 which is snugly received within the chamber 62 of the manifold casing 66. Referring particularly to Figs. 1 and 4, the rear portion of this baflle disk 63 is provided with a plurality of curved impeller vanes 65 which engage the back wall portion of the chamber 62. Upon the forward face of the bafile disk 63 is provided an annular flange 66 (see Fig. 3) which is provided with a plurality of slots or mixing nozzles 61. Referring particularly to Figs. 1, 3 and 5 it is to be understood that each of the slots 61 is disposed so that it is located substantially tangentially of the inner portion of the flange 66. Also it is to be understood that each of the slots 61 is formed within the flange 66 so that its longitudinal axis forms an acute angle with a plane defined by the baffle disk 63. Provided about the bafiie disk 63 are a plurality of circular apertures or conduits 68 each of which communicates directly with the inner portion of each of the slots 61 and is slanted inwardly and backwardly from each of these slots thereby to communicate with the spacing provided between the back wall of the member 63 and the front wall 62. Clamped over the baflle 5-. disk. 63,. by means of: a, pluralitynof; bolts 69, is a forward disk 1:0,. The-central portion of the baffle disk E53 is. providedcwith an aperture 1! which has welded therein .theforward portion of the steam conduit36 which opens directly into the space providedbetween the-.bafile' disk 63 and the rear portion of the forward disk Til. It is to be understood, therefore, that the shaft 22, the conduit 36, and the entirezrotary burner. head unit, comprising the manifold casin 60 the. baffle disk 63 and the, forward disk'lfl. Will all rotate as a unit as all of. these elements are rigidly secured together.

Referring particularly to Figs. 1, 2, and 5, the forward disk has providedthereon a series of bosses '52 which are equidistantly spaced. from the center of the disk andwhichare disposed in the same angular direction. Each of thesebosses is provided with an aperture 13 .into which is threaded a nozzle element 14. containing an orifice '55 which communicates directly with the spacing provided between. the forward portion of the baffle disk 63 and the forward disk in. by way of the conduit 13. Referring particularly to Figs. 2 and 5, it is to be understood that each of these nozzles is disposed upon the forward or leeward face of the forwarddisk 10 so as to form an acute angle therewith and to b disposed substantially tangentially of the periphery thereof. Provided in each of the nozzles M is an atomizing element 16 which comprises a substantially cylindrical member having. a plurality of helical grooves." formed about the periphery thereof for the purpose of imparting a circular motion to. any fluid that is forced thereabout and into a conical chamber 18 formed in the forward portion of the nozzle 14. Thus, any fluid which is forced into the conduit 13 has a whirlin motion imparted thereto by means of the element 16, and then the fuel goes forth into the conical chamber 18 from which it is forced through the relatively small opening #5 thereby to be ejected from the nozzle in an atomized state. The fuel thus ejected from the nozzle M will, by reaction, create a thrust upon the burner head so that the same will revolve in a counterclockwise direction as viewed from Fig. 2.

In the operation of the present device steam is directed under pressure into the chamber 43 of the casing 34 from which it is induced to enter the steam conduit 35'which delivers the same into the spacing provided between the baffle plate E53 and the forward disk 10. This steam will then find its way to the slots or mixing nozzles 6! which will in turn direct the steam to the fluidatomizing nozzles 14. Fuel oil or a solid fuel, may gain entrance into the burner unit by means of an aperture 19 provided in the housing 34. This aperture l9 conducts the oil directly into the chamber of the housing 34, from which chamber the oil may pass around the spider member 3'! thus to gain entrance into the passageway 38 defined between the steam conduit 36 and the shaft 22. This passageway 38 leads directly to the spacing provided between the rear portion of the baffle plate 53 and the forward portion of the manifold casing 59. This oil is then urged towards the periphery of the manifold casing 60 by means of the impeller blades $55 so that the oil is finallydelivered to each of the apertures or orifices 68 which communicate directly with each of the slots or nozzles 5'5.

It is tobe understood that the angular velocit of the burner head is directly proportional to the quantity of steam .whichpasses therethrough. In other words, as the valve 45. is opened more steam will pass out through the nozzles. 14' and thus the angular velocity. of the head. .will. increase. Also, as this angular velocity ofthe head increases, the impeller vanes 65 will pump the fuel oil out toward the periphery of the head under an increased pressure to the. end. that a greater quantity of fuel oil will be forced out through the nozzles M along with the. steam. This invention contemplates having the fuel oil delivered to the burner unit under a. constant head of fuel oil the pressure of which is, substantially lower than that under which the steam is delivered. Therefore, as the steam pressure is controlled by the firing valve 45, the pressure of the steam may be varied by hand manipulation of this valve to the end that a greater or lesser amount of steam will issue from the nozzles. M. This metering action of the valve 15 will be effective to vary the angular velocity of the burner unit and, furthermore, as the quantity of steam passing through the burner unit is varied, the impeller vanes hi3 will force greater or lesser quan titles of oil through the orifices 68. Also, it is to be understood that as the pressure of the steam is increased, the steam passing through the slots til will be effective to draw a greater quantity of oil through the orifices 68 thereby to supplement the pumping action of the impeller vanes. By means of the above described structure the fuel, steam, and air ratio will remain constant throughout all adjustments of the steam valve as, as the quantity of air supplied to the combustion chamber is also directly proportioned to the angular velocity of the burner head. It is also to be understood, that since the oil and steam are not mixed together until they reach an area adjacent the nozzles M, the heavier oil has little opportunity to separate from the admixture before being delivered to the nozzles 14. Therefore, the nozzles it will eject a uniform mixture of oil and steam rather than greater quantities of liquid oil unmixed with steam as was heretofore the practice in prior rotary burner units. Furthermore, in the present unit the steam flows between the furnace and the fuel thereby to insulate the fuel from the radiant furnace heat. This factor is particularly important when a colloidal fuel is used as such a fuel is readily broken down by exposure to high temperature.

Mounted within the housing 34 is a scavenger valve it which is operative to open and close a bore 2! which is provided in the housing 35. Whenever the scavenger valve is backed away from the bore 3! it is effective to place the bore in communication with the bore 53 to the end that steam. may be delivered from the chamber 53 into the oil conducting passageways of the burner unit thereby effectively to clean the same preparatory to closing down the burner unit.

A second form of the present invention is disclosed in Figs. 6 to 10 inclusive of the present drawings. Fig. 6 illustrates a second form of rotary burner in which is alsoincorporated the present invention. The rearward portion of the burner unit disclosed in Fig. 6 is substantially the same as that of the burner unit which is disclosed in Fig. 1, and, therefore, only the forward portions of this second form of burner are herein disclosed. More specifically this second form of burner unit comprises a substantially cylindrical casing 82 which has formed on the forward portion thereof an arcuately shaped air-deflecting,

flange 83 which is adapted to besecured directly to a boiler or furnace unit as at 84. Mounted centrally within the casing 82 is a journal box I3 disclosed in Fig. 1. The forward portion of the rotary shaft 22 which is disclosed in Fig. 1 is modified in the present unit disclosed in Fig. 6, such that it has mounted on the forward end portion thereof a collar member 85 welded, or otherwise secured, upon the shaft 22 as at 89. This collar 85 has secured thereto, by means of a plurality of bolts 81, a burner head 88 which is disposed coaxially of the shaft 122. This burner head 88 comprises a hollow hub portion 89 which has formed on the outer face thereof a disk 99 the diameter of which is slightly less than the diameter of the casing 82 thereby to form an air passage therebetween. A heat insulating disk 9I is secured in concentric and spaced relation with and upon the disk 99 by means of bolts 92 and bosses 93. It is the function of the disk 9I to partially insulate the burner unit from the heat which radiates from the furnace.

Secured upon the inner peripheral portion of the disk 99 are a plurality of substantially radially disposed fan blades 94. The rearward portions of the fan blades 94 have mounted thereon a. single annular ring 95. Rotation of the burner head will carry the fan blades 94 with it to the end that these blades function as a centrifugal air-fan which draws air axially of the casing 82 and then impells the same radially of the casing and against the arcuate flange portion 83. This flange portion 83 will redirect the air so that it will be forced toward the furnace unit and past the disk 9I.

Threaded into and circumferentially spaced about the periphery of the hub 89 are a plurality of hollow arms 96 which communicate with a hollow portion 89 of the hub 89. The outer end portion of each of the arms 99 is closed over and mounted upon the furnace side thereof is a nozzle unit I4 which is substantially like that nozzle 14 disclosed in Fig. 5. Each of these nozzles 14 communicates with the interior of its associated arm 96 and it is disposed at an angle such that it will be effective to impart rotation to the burner head by means of the reaction jet discharge of fluid much in the same manner as hereinabove described in connection with the burner unit disclosed in Fig. 1. Fig. 9 of the present drawings discloses each nozzle I4 as being positioned within its associated arm 99 in substantially the same fashion as each of the nozzles M is mounted upon the disk I9 as disclosed in Fig. 5. Referring particularly to Fig. 6, the conduit 36 is secured at its forward end within an opening 97 provided in a transfer cylinder 98 which in turn is secured rigidly within the forward portion of the shaft 22. The interior of the shaft 36 communicates directly with slots 99 provided in the member 98. These slots extend forwardly to open directly within the hollow portion 89' of the hub 99. The passageway 38 provided between the shaft 22 and the conduit 39 communicates with longitudinal slots I 99 formed in the member 98 and these slots in turn communicate directly with radial bores I9I also formed in member 98 which has provided at the outer end portion thereof a hollow stub shaft member I92. A hollow portion I93 of the stub shaft I92 communicates directly with the radial bores I9I. Mounted rigidly upon the forward end portion of the stub shaft I92 is a hollow block I94 which has threaded therein four hollow fuel conduits I95 disposed in communication with the interior of the stub shaft by means of bores I96 formed therein. Each one of the fuel conduits I extends radially from the axis of shaft 22 and longitudinally of a respective one of the arms 96 thereby to form a passageway I97 between itself and the interior of the arm 96. The outer portion of each one of the conduits I95 extends to a point within the arm 95 adjacent the nozzle I4 thereof and has threaded upon this end a cap member I98. The outer diameter of each of the members I98 is tapered upwardly and is provided with a plurality of fins I99 thereby to form in conjunction with the member 98 a plurality of nozzles. These nozzles act as mixing nozzles to impart an increased velocity to any fluid which may pass therebetween. A plurality of upwardly inclined orifices H9 are formed in each of the caps and conduit members I95 thereby to provide communication between the inner portion of each of the conduits I95 and these mixing nozzles.

In the operation of this second form of burner, steam gains entrance into the burner unit in the same manner as hereinabove set forth in connection with the burner disclosed in Fig. 1. This steam will be conducted forwardly within the conduit 35 thus to find its way into the longitudinal slots 99 of the member 98 and finally into the hollow portion of the burner head. From the hollow portion 39 the steam will be conducted toward the nozzles 19 through the passageways I91 and the mixing nozzles to be shot into the nozzles I4 from whence it is ejected in a manner as hereinabove set forth. Fuel oil gains entrance into the burner unit in the same manner as set forth in connection with the description of the first burner and follows along the passageway 38 defined between the conduit 39 and the shaft 22 until it is delivered into the longitudinal slots I99 provided in the transfer means 98. From the slots I99 the oil finds its way into the conduits I95 by way of the radial bores I9I and the hollow portion I93 of the member I92. It is the function of the transfer member 98 to conduct the oil, delivered about the peripheral portion of the conduit 35, axially of the member 36 into the fuel conduits I95 while at the same time functioning to receive steam axially thereof through the member 39 and to transfer the same into the hollow portion 89 of the hub. Thus, it is not necessary to deliver steam through the passageway 38 and the oil is permitted to surround the steam thereby to function as an insulator to prevent the heat of the steam from injuring the bearing members 29 and 2I.

It will be readily understood that this second form of burner unit functions in substantially the same manner as that which has been hereinabove described. For example, by manipulating the steam valve of this unit a greater or lesser amount of steam may be delivered to the burner head, and as a consequence a greater or lesser amount of oil will be directed into the steam due to the fact that the conduits I95 function as a centrifugal pump thereby to force the oil outwardly toward the nozzles 14 under a pressure which is proportional to the angular velocity of the burner head. Also, as the steam passes by each of the end caps 598 of the conduit members I95 it is effective to draw oil from these conduit members through the bores i I9 thereby to supplement the centrifugal pumping action of the rotating conduits. By permitting the steam to surround completely the oil-conducting tubes 195, the oil contained within these tubes or conduits is insulated from that heat which radiates from the furnace.

Fromthe above descriptions it is to'be understood that both the first and second forms of Iburner units function in a similar manner in that as the steam valve of each unit is manipulated,

the'an'gular velocity of each burner head is varied tothe end that thequantities of atomizing medium/fluid fuel and combustion-supporting air :delivered to the furnace are proportionately varied. As the steam valve is opened greater quantities of steam will be ejected from the nozzles M to the end that the burner head will rotate *more'rapidly. The greater the angular velocity of the burner head the greater will become the quantity of air supplied by the fan blades to the furnace. quantity of steam passing through the mixing nozzles is increased, there will be greater quantities of fuel oil pumped to these mixing nozzles.

This pumping effect of the unit upon the fuel oil is supplemented by the siphoning effect of i the steam upon the oil and thus these forces are increasingly effective to urge the fuel oil towards thernozzles =14 as the angular velocity of the burner head is increased. It is to be understood,

therefore, that the angular velocity of the burner head, and the quantities of air and fuel oil delivered-to the furnace are all varied directly as the 'quanti-tyand pressure of the steam is metered .bywthe steam valve 46. The present units are so -designedvthat the ratios among the quantities .of air, fuelw-and steam delivered to the furnace unit remain substantially constant throughout all .ad' justments of the steam valve. The burner unit, therefore,'producesan efficient combustive mix- Also, as 'hereinabove described-as the tune to the furnace combustion chamber at all 535 bafile' plate disposed within said cavity and coaxially of said disk, a plurality of fluid-atomizing nozzles formed at the periphery of and upon the furnace .side of said disk and disposed in communication with said cavity at one side-of said baffle plate, each nozzle being disposed so as to effect rotation of said disk by the reaction pressure of fluid issuing from said nozzle, means for delivering a fuel-atomizing medium to said cavity at that side of said baffle plate adjacent said nozzles, means for delivering a liquid fuel to said cavity at the other side of said baffle plate, means in the form of fluid-mixing nozzles associated with said baffle plate adjacent said fluid-atomizing nozzles for directing said fuel-atomizing medium toward said fluid-atomizing nozzles, a plurality of conduits formed in said baffle plate with each conduit connecting a r spective one of said fluid-mixing nozzles with said cavity at the other side of said baffle plate thereby to deliver fuel to each of said fluid-mixing nozzles, and means carried by said disk for directing a blast of air axially of said casing past said disk and towards said furnace. I

2. A fluid burner comprising, a casing adapted to be connected to a furnace, a set of hollow arms radially disposed and rotatably mounted within said casing, means for forcing an air blast axially of said casing past said arms and towards said furnace, fluid-atomizing nozzles formed at the outer ends of said arms and adapted for discharging fluid into said air blast thereby to cause by reaction rotation of said arms, separate means for conducting fluids under pressure from two diiferentsupply sources outside said casing to an area within eachof said arms adjacent its nozzle, andmeans' disposedwithin each of said armsiand adjacent its associated nozzle for mixing the two fluids and for discharging the admixture towards said nozzle.

'3. Afluid burner comprising, a casing adapted tobe connected toa furnace, a set of hollow arms radially disposed and rotatably mounted within said casing,.means for forcing an air blast axially of said casing past said arms and towards said furnace, fluideiatom'izing nozzles formed at the outer ends of'said-arms and adapted for dischargingifluid into said air blast thereby to cause by reaction "rotation of said arms, means for conducting aifluid under pressure from a first source outsidesaid casing to each arm so that said fluid will be ejectedufrom said nozzles, a conduit disposed coaxially of and within each of said hollow arms, said conduits extending substantially to the outer end of each arm, and means for conducting a fuel from a second source outside said casing toeach of said conduits so that the fluids from said first and second sources may be mixed together at a point adjacent each of said nozzles prior :to being discharged therefrom.

4. A fluid burner comprising, a casing adapted to be connected to a furnace, a set of hollow arms radially disposed and rotatably mounted within said casing, means associated with said arms for forcing an air blast axially of said casing past said arms and towards said furnace, a fluid-atomizing nozzle formed at the outer end portion of each arm and adapted for discharging fluid into said air blast thereby to cause by reaction rotation of said arms, a steam conducting conduitdisposed axially of said casing and connected with each of said arms for delivering steam under pressure to each of said nozzles, a liquid fuelconduit axially disposed within each of said arms and having an opening therein at apoint adjacent the outer end portion. of said :arm,rand*means for conducting liquid fuel axially of "said casing and to each of said liquid fuel conduits.

A burner head for use with a fluidburner having :a casing adapted to be connected to a furnace, a fuel-conducting tube disposed axially of said casing, and means disposed within said tube for separately conducting fluids lengthwise of said tube from two different supply sources, said burner head comprising, means including a collar rotatably mounted within said casing and being carried upon one end of said tube, a plurality of fluid-atomizing nozzles carried by said last mentioned means and circumferentially spaced about the periphery of said collar, said nozzles being adapted for discharging fluid into the atmosphere thereby to cause by reaction rotation of the entire burner head about the axis of said tube, and means disposed radially of said tube and connected with said first mentioned means for separately delivering each of said fluids to each of said nozzles.

6. A burner head for use with a fluid burner having a casing adapted to be connected to a furnace, a fuel-conducting tube disposed axially of said casing, and means disposed within said tube for separately conducting fluids lengthwise of said tube from two different supply sources, said burner head comprising, means including a collar rotatably mounted within said casing and being carried upon one end of said tube, a plurality of fluid-atomizing nozzles carried by said last mentioned means and circumferentially spaced about the periphery of said collar, said nozzles being adapted for discharging fluid into the atmosphere thereby to cause by reaction rotation of the entire burner head about the axis of said tube, means forming separate passageways disposed radially of said tube and connected with said first mentioned means for separately delivering each of said fluids to areas adjacent each of said nozzles, and means disposed adjacent to each of said nozzles for mixing the two fluids and for discharging the admixture toward each of said nozzles.

7. Fluid discharging means for use with a fluid burner having a casing adapted to be connected to a furnace, a fuel-conducting tube disposed axially of said casing, and means disposed within said tube for separately conducting fluids lengthwise of said tube from two different supply sources, said fluid discharging means comprising, a burner head rotatably mounted within said casing and being carried upon one end of said tube, a plurality of nozzles carried by and circumferentially spaced about the periphery of said burner head for discharging fluid into the atmosphere thereby to cause by reaction rotation of said burner head about the axis of said tube, means disposed within said burner head and forming separate passageways disposed radially of said tube for conducting each of the two fuels separately from said first mentioned means to areas within said burner head adjacent said nozzles, and a plurality of fluid-mixing nozzles disposed entirely within the confines of said' burner head at points adjacent said first-mentioned'nozzles, said fluid-mixing nozzles being connected with said last mentioned means for e'fiecting ad mixture of the two separate fuels and for discharging the admixture into said first mentioned nozzles.

8. A burner head for use with a fluid burner having a casing adapted to be connected to a furnace, a fuel-conducting tube disposed axially of said casing, and means disposed within said tube for separately conducting fluids lengthwise of said tube from two different supply sources, said burner head comprising, a hollow fluiddistrib-uting disk rotatably mounted within said casing and being carried upon said tube, a plurality of fluid-atomizing nozzles formed at the periphery of and upon the furnace side of said disk, each nozzle being disposed so as to efiect rotation of said disk by the reaction pressure of fluid issuing from said nozzle, means forming separate passageways disposed within and radially of said disk for separately delivering each of said fluids from said first mentioned means to areas adjacent each of said nozzles, and means disposed within said disk and adjacent each of said nozzles for mixing the two fluids and for discharging the admixture toward each of said nozzles.

9. A burner head for use with a fluid burner having a casing adapted to be connected to a furnace, a fuel-conducting tube disposed axially of said casing, and means disposed within said tube for separately conducting fluids lengthwise of said tube from two different supply sources, said burner head comprising, a fluid-distributing disk rotatably mounted within said casing and being carried upon said tube, said disk having a cylindrical manifold cavity formed therein, a baffle plate disposed within said cavity and coaxially of said disk so as to divide the cavity into two compartments, means for connecting the central portion of each of the compartments with said first mentioned means so that each compartment will receive a respective one of the REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Gibson June 13, 1944 Number

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