US2655986A - Burner of the projected flame type - Google Patents

Description

Oct. 20, 1953 J. w. PENNINGTON BURNER OF THE PROJECTED FLAME TYPE 4 Sheet-Sheet 1 Filed Aug. 23, 1950 (wines M/liam Penm'ngaon' IN V EN TOR Oct. 20, 1953 J. w. PENNINGTON BURNER OF THE PROJECTED FLAME TYPE 4 Sheets-Sheet 2 Filed Aug. 23, 1950 Oct. 20, 1953 J. W. PENNINGTON BURNER OF THE PROJECTED FLAME TYPE 4 Sheets-Sheet 5 Filed Aug. 23, 1950 INVENTOR.

n m w. cu 5 R Q My on 3 mm WW an a 8 m g M. m mm [1 wv n r/ If//\f////////////////f/d// Q Q\ I I k m M J WM QM mm: l ow km mwl a 3 w mu Q Nw 5 M J.- w. PENNINGTON BURNER OF THE PROJECTED FLAME TYPE Oct. 20, 1953 4 Sheets-Sheet 4 Filed v Aug. 23, 1950 1 m? QQ Q Patented Oct. 20, 1953 UNITED STATES PATENT GFFICE James William Fennin'gton, Chicago, 111;, assignor to InIand'S'tccL Gnmpany', Chicago, lll'., ap cor-- poration of Delaware Application August 23, 1950; Serial N o. 1 8 1,022 24;- Claims. (01." 158-1 1 )1 This invention relates to a burner, which is adapted particularly for use under conditions re quiring projection of a flame of high intensity. Such burners. are useful, for example, in themeit-' ing of metal in furnaces of the open hearth type, although not necessarily limited'tosuch application.

An object of the invention is to improve the efiiciency of burners of the general character herein disclosed; and 'to obtain maximum combastionof the fuel with higher flame temperatures;

Another object is to produce a burner oi the character stated, which is self-cleaning; and capable of operating throughout extended periods of time without servicing;

Another object is to so construct the burner as to greatly extend itsuseful'life', while at the. same time reduci'ng'the cost of manufacture and the cost of maintenance thereof.

The. foregoing and other objects are attained by the means described herein and. illustrated upon the accompanying drawings, in which:

Fig. l. is a cross-sectional view showing part of an open hearth furnace; with the improved burner of" the invention losing illustrated inside elevation:

Fig. Zis; an enlarged cross-sectional view: taken on line 2-2 of Figzl.

Fig; 3- is'a side elevational View; partly broken away, showings. forward wt'uhe'support"mjemb'er' incorporated inthe' burnernose. V

Fig. 4' is a side elevational view, partlybroken: away, showing a part of. the tube: support" member;

Fig; 5 is a vertical. sectionxtaken at the" rear" portion of the burner; showingthestructure'on' an enlarged scale;

Fig; 6'isa.cross sectional-view'taken on line 8-4501 Fig.5.

Fig; 7' i'sa verticalsection, at. twice'the'sc'ale' oi'Fig; 5', showing: thefor'ward" or'no se end of. the burner;

Fig. 8* is a fragmentary endelevational. view of the" nose" endoff' the" pumerillustratedifby Fi 7;. V

iig. 9' is" a frontview' of a modiflediform of burner.

Fig: lO'is a;cross-sectiona1 viewtaken on" line ifl -lil' of'Fig. 9.

In Fig: 1' ofthe drawings, a burner in embodying-the invention is-"s-liown mountedinplace' on afurnacesuch as anopen hearth,- fo'r ex ample; The burner extends througha port I2 2: trunnions [3 journale'd inbearing brackets I4, one at each side of the burner. The brackets may be secured to a transverse beam [5 supported by the furnace wall or otherwise. The burner may be swung or rocked upon the trunnions t3; as by means of a screw t and handwheel [-1, for directing the fiame'of the burner to a desired angle-upon the meltwhich res'tsupon the hearth forwardly of the burner;

The nose end I8- of the burner is adapted to deliver into the furnace, a combustible atomized mixture of oil, gas,- oxygen and steam, or various combinations thereof; The gasused may be coke oven gas, illuminating gas, or the equivalent, and: in some instances various grades or types" of tar, pitch, or the like, is substitutedfor the oil or'mi xed'therewith to form aproper viscous fuel.

Referring to Figs; 1 and 6'; thesupply pipe for viscous fuel or oil'is indicated at 59; the supply pipe for gas or gaseous fuel is shown at 20-; the supply pipefor oxygen or itsequivalent isat 21 steam pipes are shown at'2f2', 23 24 and 25; and pipesfor a cooling fluid, such as water, are indicated by the characters 26, 2.1, and 28. Pipe 2-8 furnished with acock 29 and" a cap 38 whichconstitut'e' a blow-off arrangement for clearing the cooli'ng systemofdirt", sediment, and any foreign matter that might ac cumulate therein; Cooling fluid normally may enter the pipe 2'1 which conveys itto the forwardend of the encircling water jacket 3+ of the burner, whereas pipe 25 exhausts the cooling fluid from the ja'cketp The flow of cooling fluid through the-jacket preferably is contii'iuous.

It should be understood that the various pipes mentioned in the-paragraph next above are usu'-- allyconnected witn source's' ofsupply which can be controlled by means or valves or otherwise,

and due to the fact thatthe burner is rockable upon itstrunnion's I 33. theiconnections are-neces sarily flexible? Flexible hoses-or swivel couplingsare suitable for the purpose;

At the left or ire'anend of the-burner is" locatedthe atomizer 32 for viscous fuel; Within the atomizer, fuel fromthe'suppl'y pipe F9- is di rected'through anozzlei 33'into' the mixingcham her '34 where it is met by a blast I o'fstea-m from thesteam. pipe 22$ and atomized thereby before passing through arr orifice-35 leading t'othe' fuel delivery tube 365 A't'o'mizedfuel enteringthe fuel delivery tube- 3l6 at..35; travels the full len'gth of said tube ah'd" is dischargediat the-burner'nose-(Fi'g 7); Surin theiurnacewalh andmayhesupported upon 551rounding the atoufi'ze z u i v r u gsi a fuel tube heater, which may be in the form of a jacket tube 3'3 spaced from the fuel delivery tube as shown, the passageway 38 thereby established being adapted to convey a heating medium, 7

supports the rear end of jacket tube 3'! by.

means of a threaded connection M at the packing gland 32. Gland 12 may be welded or otherwise fixed to the end of the jacket tube, as at 43.

The fuel delivery tube 36 may be maintained in concentric spaced relation to the jacket tube 31,

by threading it into a bore of an intermediate wall of the atomizer housing, as at 44. As will be evident, the steam chamber 39 is separated from the atomizing chamber 34 by said intermediate wall 45.

In a manner somewhat similar to that just described, a delivery tube 36 for oxygen or an equivalent gas for supporting combustion, is incorporated in the burner structure. The tube 36,

threaded or otherwise fixed as at 4'! within the housing section 48, communicates with a chamber 49 to which oxygen or an equivalent combustion supporting gas is fed from a controlled source of supply by means of the pipe 2|. A heater for the oxygen delivery tube may be in the form of a jacket tube 56 surrounding the tube 46 in spaced relation, providing a passageway or jacket 5! to be supplied with steam or other heating medium fed by way of pipe 26 to the steam chamber 52. It will be seen that the jacket 5! is placed in communication with the steam cham ber 52, by supplying the jacket tube with a fixed bushing 53 which is externally threaded and engaged by threads 54 of a bore in the housing wall 55. This connection and the connection at H serve to maintain the tubes 46 and 5c in spaced concentricity. At the rear of housing section 48, a flange 56 provides a mounting means for the atomizer 32, which has a similar cooperative mounting flange 5?.

Referring to Fig. '7, it will be noted that the oxygen delivery tube 46 and its jacket extend substantially to the nose of the burner, in substantial parallelism with the fuel delivery tube 36 and its heating jacket 31. All of these elements are surrounded by an inner cooling jacket tube 58 of large diameter, extending substantially from the burner nose rearwardly to the housing 48. At its rear end, the inner cooling jacket tube may be supported in any suitable manner, for example as illustrated by Fig. 5, wherein the coupling ring 59 is shown provided with a bore E0 to receive the inner jacket tube 58, with provision made for a gasket or packing ring 6| to prevent leakage about the outer surface of the tube. The gasket or packing may be held in compressed condition about tube 58 by means of a gland 62 threadedly engaging the threaded bore 63 of the coupling member as shown. An enlarged inner bore 64 of the gland forms a passageway whereby the entire open end 65 of the inner cooling jacket tube is placed in communication with a large chamber 63 of housing section 48, which is fed with gaseous fuel by the large pipe 20. This aseous fuel. as previously stated, maybe coke oven gas, illuminating gas, or a combustible gas of any other type. The flow of such gas preferably is controlled at the source, or at some location in the supply line exteriorly of the burner. Leakage of gas into the water jacket 3! and steam chamber 39 is precluded by the packings BI and 42. A tight connection, of course, is perfected in any known manner, at the flanges 61 and 68 of the housing parts 59 and 48.

Gas from the chamber 65 may flow through the opening 64 and all about the tubes Within the cooling jacket member 58, to finally emerge from the burner nose at the large spaces 69-59 of Fig. 8, where the gas mingles with the oxygen, the atomized fuel oil, and the steam from the heating jackets.

The gas tube 58, if supplied with a gas that carries particles of impurities, may require cleaning from time to time. Periodic or intermittent cleaning, or continuous cleaning if preferred, may be effected by incorporating in the burner a high pressure nozzle 12 for steam or other fluid, capable of dislodging such particles and blowing them out through the burner nose. The nozzle,

the housing 48 as an arcuate narrow slot 12 in communication with a steam chamber #3 fed by the supply pipe 25. The nozzle slot preferably is located close to the open end 65 of the gas delivery tube, in position to dislodge any particles resting in the lowermost portion of the tube. Preferably, the arcuacy of the slot approximates that of the inside diameter of the gas tube, and may extend about the tube periphery degrees, more or less, as clearly illustrated by Fig. 6. The inner wall 74 of the chamber '63 may be integral with the housing 48, and may be cut away or depressed slightly at 15 to accommodate the jacket tube 56 which is in close proximity to the nozzle slot at the depression.

From the foregoing, it will be understood that a blast of steam or other high pressure fluid directed into the chamber 13 by pipe 25, will strike and move, toward the forward end of the burner, any accumulation of particles that might be carried over by the gas and lodged in the gas delivery tube 58. Coke oven gas, for example, will often carry impurities that may lodge in the gas delivery tube, and by means of the nozzle arrangement herein disclosed, such impurities easily and quickly may be removed at intervals, by simply directing a high pressure fluid to the nozzle 12. The supply of high pressure fluid may be controlled by a two-way valve 72V interposed in steam pipe 22, by preference. The valve may be under the control of a burner attendant, or it may be opened periodically by automatic means if desired. The attendant may wish to clean the gas delivery tube by the aforesaid pressure method only when the burner is out of operation, and this procedure may be adequate under most conditions of usage. The accumulations leave the burner through the nose at 69.

The exterior of the burner comprises the long large tube 10, which extends from the flange 61 to the nose of the burner, and serves as the outer jacket member for cooling fluid. This tube Ill is commonly known as the burner barrel. The pipe 21 connects with the tube 70 near the burner .nose, and supplies water as cooling fluid to the The coolant exhaust pipe radial legs- I 05, the outer ends of which rest against the inner surface of the gaseous fuel tube The gas in traveling through the tube 58 toward the burner nose, flows freely all around the spider legs and the tubes supported thereby. The spider may be secured to the tubes by set screws I06 or any other form of fastening means.

Attention is directed to the fact that the atomizer illustrated at the left of Fig. 5 may atomize or condition for combustion, oil, tar, pitch or other viscous fuel introduced therein by way of the supply pipe I9, and discharged under pressure through nozzle 33 into the mixing chamber 34. Steam or other atomizing fluid under pressure enters the chamber by way of supply pipe 22, and acts upon the viscous fuel to atomize it prior to discharge through the port 35 and fuel delivery tube 36. The atomizing fluid pressure may be controlled at the source, or by placing a suitable control valve in the supply line 22, as will be understood. The nature or type of atomizer employed is a matter wholly immaterial to the present invention, as any known form of atomizer having the necessary capacity will suffice.

In the modified form of burner illustrated by Figs. 9 and 10, the jacketed tube for supplying oxygen or other combustion-supporting gas has been eliminated, but in all other respects the modified form carries all of the features of the burner hereinbefore described. The similarity is most clearly indicated by the application to Figs. 9 and 10, of the same reference characters applied to Figs. 7 and 8, with the digit 1 prefixed thereto. Accordingly, in Figs. 9 and 10, I36 and I31 are the atomized fuel delivery tube and its jacket, respectively, surrounded by the inner cooling jacket tube I58 which conveys gaseous fuel to the forward end of the burner. The space I38 between tubes I36 and I3! conveys steam or other heating fluid along the length of the fuel delivery tube, discharging same into the radial ports I94 and annular chamber I91, whence it emerges under pressure through the annular slit or nozzle I99I I00 to furnish the protective curtain or screen ahead of the burner nose as previously described.

The modified form of burner is to be supplied with atomized viscous fuel, gaseous fuel, and jacket steam, in substantially the manner explained in connection with Figs. 1 to 8, inclusive, and will of course include a high pressure cleaning nozzle for the gaseous fuel tube as indicated at I2 upon Figs. 5 and 6. In this instance, as well as in Fig. 1, the high pressure cleaning nozzle may receive its steam pressure from the supply pipe 22 as the two-way valve is manipulated at the will of the operator. It should be understood, however, that in either form of the device the nozzle pressure may be supplied otherwise.

Actual tests in open hearth furnaces have proven the superiority of the present burner over all others heretofore used or proposed. The improved burner of this invention has operated for greatly extended periods of time without need of cleaning, or shutting down for any reason. The flame produced was much hotter than usual, and it was found that the fuels leaving the burner nose were in a more favorable condition for combustion than could have been expected in any other known form of burner.

The self-cleaning features of the improved burner are highly advantageous, for obvious reasons; and the presence of the fluid-curtain pr screen over the end-of the burner nosecontribes greatly to'th'e trouble-free performance of the burner. Whenever coke oven gas carrying particles of impurities is used in the burner, occasional use of the steamnozzle 12 will avoid clogging and the laborious cleaning operation which heretofore required taking the burner out of service. With the foregoing advantages and others hereinbefore mentioned, the tonnage of steel that can be produced in open hearth furnaces by means of the improved burner, is materially'increased, with a substantia1 reduction in cost of manufacture.

It is to be understood that various modifications and changes in the structural details of the device may be made, within the scope of the appended claims, without departing from the spirit of the invention. The nature of the fuels used, and the heating and atomizing mediums employed, are subject to variation under justifiable circumstances.

What I claim is:

l. A burner of the class described, comprising in combination an inner elongate main tube having a cooling jacket, the inner tube being open at its forward and rearward ends, means for supplying gaseous fuel to the rearward end of said inner main tube for discharge from the forward end thereof, a viscous fuel delivery tube and a delivery tube for a combustion supporting gas, both extending lengthwise within the inner main tube, and each having a forward open end terminating near the forward end of the inner main tube, a pair of jacket tubes, one surrounding each of the delivery tubes in spaced relation, each jacket tube having an open forward end, means for supplying a heating fluid to the spaces defined by the jacket tubes, for maintainin an elevated temperature of the delivery tubes, and means for supplying viscous fuel and a combustion supporting gas to the respective delivery tubes for discharge from the forward open ends thereof.

2. A burner of the class described, comprising in combination, an inner elongated main tube having a cooling jacket, the inner tube being open at its forward and rearward ends, means for supplying gaseous fuel to the rearward end of said inner main tube for discharge from the forward end thereof, a viscous fuel delivery tube and a delivery tube for a combustion supporting gas, both extendin lengthwise within the inner main tube, and each having a forward open end terminating near the forward end of the inner main tube, a pair of jacket tubes, one surrounding each of the delivery tubes in spaced relation, each jacket tube having an open forward end, means for supplying a heating fluid to the spaces defined by the jacket tubes, for maintaining an elevated temperature of the delivery tubes, means for supplying viscous fuel and a combustion supporting gas to the respective delivery tubes for discharge from the forward open ends thereof, and high pressure fluid means including a nozzle located near the open rearward end of the inner main tube, for blowing from said tube foreign matter deposited therein by the gaseous fuel.

3. A burner of the class described, comprising in combination, an inner elongate main tube having a cooling jacket, the inner tube being open at its forward and rearward ends, means for supplying gaseous fuel to the rearward end of said inner main tube for discharge from the forward end thereof, a viscousfuel delivery tube es-sagas and a elivery tube for a o iribustidn siifipeiting gas, both extending lengthwise within the inner tube, and each hay-ing'a forward open'end initiating near the forward'end of the inner main tube-,a pair or jacket tubes, one surroundmg each of the delivery tubes in spaced relation, jacket tube having an open forward she, means for supplying a heating fiuid to the sbaees'defined by the jacket tubes, for maintaini-iig an elevated temperature of the delivery tubes, means for sup-plying viscous fuel and a combustion supporting gas to the respective delivery tubes for discharge from the forward open ends thereof, and means for collecting fluid emitted from the jacket tubes, and disbursing said fluid as a screen across the forward open end of the inner main tube, to deflect extraneous foreign matter tending to enter said main tube.

4-. A burner of the classdescribed, comprising in "eeinbination, an inner elongate inain tube havin a cooling jacket, the inner tube being open at its forward and rearward ends, means for supplying gaseous fuel to the rearward end of said inner main tube for discharge from the forward. end thereof, a viscous fuel delivery tube ahda delivery tube for a combustion supporting gas, both extending lengthwise within the inner main tube, and each having a forward open end terminating near the forward end of the inner main tube, 'a pair of jacket tubes, one surroundmg each of the delivery tubes in spaced relation, each jacket tube having an open forward end, means for supplying a heating fluid to the spaces defined by the jacket tubes, for maintaining an elevated temperature of the delivery tubes, means for sup-plying viscous fuel and a combustion supporting gas to the respective delievry tubes for discharge from the forward open ends thereof, means for directing the heating fiuid'from the jackets as a protective screen across the forward open end of the inner main tube, and high pressure fluid means including a nozzle located near the open rearward end of the inner main tube, for blowing from said tube foreign matter deposited therein by the gaseous fliEl'.

5. A burner of the class described, comprising in combination, an inner elongate main tube having a cooling jacket, the inner tube being open at its forward and rearward ends, a viscous fuel tube and a tube for conveying a combustion supporting gas, both extending lengthwise within the inner main tube, and each having a forward end open and terminating near the forward end of the inner main tube, a jacket tube sur rounding the viscous fuel tube in spaced relation, and open at its forward end, for conveying a heating fluid along the length of said fuel tube to maintain an elevated temperature of the latter, a second jacket tube similarly related to the tube for conveying combustion supporting gas, said second jacket tube having an open forward end terminating near the open forward end of the first mentioned jacket tube, means near the rear end of the burner for supplying viscous fuel to the viscous fuel tube, 'means for supplying a combustion supporting gas to the combustion supporting gas tube, means for supplying gaseous fuel ot the interior of the inner main tube, and means for supplying a heating fluid under pres= sure to the spaces defined by the jacket tubes aforesaid, and means for directing the heating fluid issuin from said jacket tubes, to form a protective screen across the forward end of the inner main tube of the burner,

'6. A of tee class desbr-ibed,fcbinprising incembinaucn, an eicngate bar-n1 having a f rward nose end, 'tube' rfieanswithin the barrelfei delivering combustible fuel to an through the noseena of the barrel, 'one of said time means having cdii "e'ctien "vv'th a sorc'elor -cernbustibl'e gas which r particles of impurities capable cr ac the gas tube high means including a he'zz'ile having-a mouth in the path or gas incvement to, traw out the articles impurities from the gas tate in the general direction er the gas non-said ne'zzie matinee-11 its (1 nder the gas tube 'and in 'ate'rtioal plane passing th-riigh the center eftl ie gastube. I

v. A burner er the class descr bed, com I in combinatidn, an eicng'atea were having forwardno end, tube means within theta rel for deliveringcombustible fuel to and g" the noseeri'd ofth'e barrel, one or'saidjtiibe cans aving open end within the ta'rretsa been end being in minimum-[cation with a e of gasecusrue in be discharged through Sara tube means tcwa'rd tne'nose endo'f the barrel, a controllable high pressure timdmeam including a nozzle having an arcuate mouth for directing a fluid into the barrel, the mouth being disposed in close prbiiimity to said c cn end, andsiibstancur'v tu're tia l ly cinciding with a portion of the by afselected area tithe t t'o the scouring abtion of a high pressure new emitted y the ar uate mouth or the a. A burner cf tne ass described, in combination, "an elongate barrel htv ward nose end, tube means within the barr' ischarging c6ifibustib1ematc'ria1 under -'pr su through the nose end of the barrel, heating jacket ineans 'aboutfs'aid tube riieans, sees "a to c nvey a heating hula awng the tube means towathenose en or the barter-a nuisances ge' rat r' disposed within the nose end of the barrel, including chamber-means for 'collecting the heat: in fluid, and an annular nc'zz'ie in communication withsaid chamber means, said annular nc'z zle including a lip angularly inclined to 'dlret a ccnica fscreen of fluid" wardly of the barrel nb'se end, 4 through 0h screen the combustible material passes "in leaving the no e end of the barrel 9. A burner cf the ciass described, compri in c mbination, an elongate barrel having a were nose end, tape means within the bane 6i discharging combustible material under ure through the nose en or thcbani, hea ng j ac'ket 'rneansabc t saidtube adapted "to convey a heating fluid along the tube means it ward the nose end of the barrel, "a fluid'=screen en rator isposed within the nose end bf an barrel, inc

r g chamber me ns for detecting U idand an annuia'rjnczz e in cornnmnica cr witnsa d cham er eans,- said an ar nozzle including aiipanguiany incline to direct a conical screen offlu id inwardly and for about said tube means, adapted to convey a heating fluid along the tube means toward the nose end of the barrel, and nozzle means within said nose end of the barrel providing an annular chamber, said chamber having an interior port in communication with the heating jacket of the oxygen-delivering tube means, the nozzle means including an annular mouth in communication with the chamber, and a lip at the mouth angularly inclined to direct a conical stream of the heating fluid from said jacket inwardly and forwardly in advance of the barrel nose end.

11. A burner of the class described, comprising in combination, an inner elongate main tube open at its forward and rear ends, a multi-chambered housing secured relative to the tube in substan tial alignment therewith at the rear end, one chamber of the housing being in communication with the open rear end of the tube, means supplying a gaseous fuel to said chamber for ejec- 1 tion through the main tube and its forward end, a viscous fuel delivery tube extending lengthwise through the main tube and through the gaseous fuel chamber, to a location exteriorly of the housing, said viscous fuel delivery tube having an open forward end terminating near the open forward end of the main tube, means supplying atomized viscous fuel to the opposite end of said delivery tube, a heating jacket tube surrounding substantially the full length of the fuel delivery tube and laterally spaced therefrom to provide a heating jacket, one end of the jacket tube being open at the forward end of the main tube, and the other end being open exteriorly of the housing, means supplying a heating fluid under press sure to said other end of the jacket tube, a nozzle formed in the housing and having communication with a second chamber of the housing, means supplying a high pressure fluid to said second chamber for feeding said nozzle, the nozzle being shaped arcuately in substantial conformity with the interior of the main tube, and 1 limited as to the length of the arc, so as to direct the high pressure fluid into the rear open end of the main tube along a portion only of its inner surface.

12. A burner of the class described, comprising in combination, an inner elongate main tube open at its forward and rear ends, a multi-cham bered housing secured relative to the tube in substantial alignment therewith at the rear end, one

chamber of the housing being in communication with the open rear end of the tube, means supplying a gaseous fuel to said chamber for ejection through the main tube and its forward end, a viscous fuel delivery tube extending lengthwise through the main tube and through the gaseous fuel chamber, to a location exteriorly of the housing, said viscous fuel delivery tube having an open forward end terminating near the open forward end of the main tube, means supplying atomized viscous fuel to the opposite end of said delivery tube, a heating jacket tube surrounding substantially the full length of the fuel delivery tube and laterally spaced therefrom to provide a heating jacket, one end of the jacket tube being open at the forward end of the main tube, and the other end being open exteriorly of the housing, means supplying a heating fluid underpressure to said other end of the jacket tube, a nozzle formed in the housing and having communication with a second chamber of the housing, means supplying a high pressure fluid to said second chamber for feeding said nozzle, the nozzle being disposed in close proximity to the open end 12 of the main tube for directing a scouring stream lengthwise through the interior of the tube.

13. A burner of the class described, comprising in combination, an inner elongate main tube open at its forward and rear ends, a multi-chambered housing secured relative to the tube in substantial alignment therewith at the rear end, one chamber of the housing being in communication with the open rear end of the tube, means supplying a gaseous fuel to said chamber for ejection through the main'tube and its forward end, a viscous fuel delivery tube extending lengthwise through the main tube and through the gaseous fuel chamber, to a location exteriorly of the housing, said viscous fuel delivery tube having an open forward end terminating near the open forward end of the main tube, means supplying atomized viscous fuel to the opposite end of said delivery tube, a heating jacket tube surrounding substantially the full length of the fuel delivery tube and laterally spaced therefrom to provide a heating jacket, one end of the jacket tube being open at the forward end of the main tube, and the other end being open exteriorly of the housing, means supplying a heating fluid under pressure to said other end of the jacket tube, a nozzle formed in the housing and having communication with a second chamber of the housing, means supplying a high pressure fluid to said second chamber for feeding said nozzle, the nozzle being disposed in close proximity to the open rear end of the main tube for directing a scouring stream lengthwise through the interior of the tube, and a fluid-curtain generator at the opposite forward end of the main tube, utilizing heating fluid discharged from the heating jacket for establishing a protective screen across the forward end of the main tube.

14. A burner of the class described, comprising in combination, an elongate barrel, a gaseous fuel delivery tube within the barrel, a delivery tube for atomized viscous fuel, and an oxygen tube, jacket tubes surrounding the oxygen and the viscous fuel delivery tubes, and means supplying heating steam under pressure to said jacket tubes, all of the tubes being in substantial parallelism and discharging in a common general direction forwardly of the burner.

15. A burner construction comprisin in combination, an inner main tube to convey a fuel, and having a discharge end of substantial size, a cylindrical body substantially concentric with the'discharge end of said tube, and having therein an annular chamber terminating in an annular narrow slot including means to direct a fluid from of the web, for conveying heating fluid under pressure to the annular narrow slot of the chamber.

16. A burner of the class described, comprising in combination, an elongate hollow barrel, a tube therein for conveyinggaseous fuel, a delivery tube for atomized viscous fuel, and an oxidizing-fluid delivery stub-e, gsaid @deliveny etubes being-spaced apartlanddisposedsone abnveeanothemvithin the :tube fongaseoustfuel,ialhofasaidttubesfihavingacorresponding open .-ends :adjacent -.to one :end .of the elongate thollow barrel, 'sflui-d conducting means about each of said delivery tubes for maintaining a heated eondition -of said delivery tubes, and ns .19a thween -:ee -:9 -;.sa p tubes for establishing a protective fluid curtain trans- .vsrs lv her 1.4 bann of the class descr b o llnris in:cornbirration, an elongate hollow barrel, a;tube therein for conveying gaseops 'f uel, a ,delivery tu fe etq sil et-aed an oxidizin fluid delivery tube, said delivery tube :being spaced apart and disposed one .above .enflther the tube for gaseous fuelall of saidtubes 'alving corresp din .ds a en o ,on iii of lt afll ollow h., :e1;. .c ndiwt- Iles a e s about each of id .deli tu es fo maintaining a heated condition of said delivery tubes, and means near the open ends of said tubes for establishin a protective fluid curtain transversely thereof, utilizing that heating medium which heats the delivery tubes for viscous fuel and the oxidizing-fluid.

18. A burner of the class described, comprising in combination, an elongate hollow barrel, an inner jacket tube therein, a delivery tube for atomized viscous fuel, and an oxidizing-fluid delivery tube, said delivery tubes being spaced apart in substantial parallelism within the inner jacket tube of the barrel, and each having an open end exposed adjacent to one end of the barrel, a heating jacket member surrounding the oxidizing-fluid delivery tube in spaced relation, means for feeding a heating medium under pressure into the space between the oxidizing-fluid delivery tube and its surrounding jacket member,

the direction of heating medium feed bein toward the aforesaid open ends of the delivery tubes, with release of the heating medium occurring about the exposed open end of the oxidizingfiuid delivery tube.

19. A burner of the class described, comprising in combination, an elongate hollow barrel, an inner jacket tube therein, a delivery tube for atomized viscous fuel, and an oxidizing-fluid delivery tube, said delivery tubes being spaced apart in substantial parallelism within the inner jacket tube of the barrel, and each having an open end exposed adjacent to one end of the barrel, a heating jacket member surrounding the oxidizing-fluid delivery tube in spaced relation,

means for feeding a heating medium under pressure into the space between the oxidizing-fluid delivery tube and its surrounding jacket member, the direction of heating medium feed being toward the aforesaid open ends of the delivery tubes, with release of the heating medium occurring about the exposed open end of the oxidizingfluid delivery tube, and means deflecting the released heating medium as a protective screen transversely across the open end of said oxidizing-fluid delivery tube.

20. A burner of the class described, comprising in combination, an elongate hollow barrel, an inner jacket tube located inside the barrel and having rear and forward ends, a delivery tube for atomized viscous fuel extending lengthwise through the jacket tube and having an open forward end to deliver a combustible mixture forwardly of the burner, a viscous fuel atomizer near the rear end of the barrel, and supply pipes for viscous fuel and high pressure atomizing fluid .connected to saidratomizenrmeansmear.'Itherreaa' end :of :.:the -.=;inner ejacket ttube :ei'ithe ebarnel Etor :fee'ding; gaseousefuehthrcughs said zjacketztubexia high pressure cleaning nozzle} located toiiirectia blastrthrough' the inner jacketztube 'fromfrear to :frcnt thereof,:andimeansincludingiavalvemperattve etc, selectivelyi-connectsthelhigh pressure :fiuid supply pipe .tOi'theiHQZfleiOITtO'ZthB atomizer.

i121. Pn-bnrnertof ,themlassrdescribed,scomprising :inacombination anmlongateiholloufi barrel having a s-fonward. open inose' send, ea :delivery ztube -::for atomized 'iviscous r fnel,sand 'ani oxidizing-medium delivery .tube, 1 said ,delivery :tnbes ib'eingcspaced aparhinesubstantia1:parallelismtwvithmzthei hollow interior {of ;the zburnerabarrehandzwch'rhavmgian opensendxxposedenearithenoseend-ofisaid barrel, separate iheat'ing jacket "tubes surrounding esaid delivery'atubes inispaeedsrelation thereto tandcextending substantially ithe :full i'l'ength 10f itheirtre- SROGtLVBzdBliVQIf-Y tubes means .SIIIlDlVlIIgntOIIfiZGH :viscousifuelitoztheifuell delivery*tubeffornischarge at the nose end of the barrel, means supplying an oxidizing medium to the oxidizing-medium delivery tube for discharge likewise at the nose end of the barrel, and means supplying a heating medium under pressure to the spaces between the delivery tubes and their respective jacket tubes, in a common direction toward the open forward ends of the delivery tubes.

22. A burner of the class described, comprising in combination, an elongate hollow barrel having a forward open nose end, a delivery tube for atomized viscous fuel, and an oxidizing-medium delivery tube, said delivery tubes being spaced apart in substantial parallelism within the hollow interior of the burner barrel, and each having an open end exposed near the nose end of said barrel, separate heating jacket tubes surrounding said delivery tubes in spaced relation thereto and extending substantially the full length of their respective delivery tubes, means supplying atomized viscous fuel to the fuel delivery tube for discharge at the nose end of the barrel, means supplying an oxidizing medium to the oxidizingmedium delivery tube for discharge likewise at the nose end of the barrel, and means supplying a heating medium under pressure to the spaces between the delivery tubes and their respective jacket tubes, in a common direction toward the open forward ends of the delivery tubes, said spaces being open near the nose end of the barrel to release the heating medium in the general direction of fuel election.

23. A burner of the class described, comprising in combination, an elongate hollow barrel having a forward open nose end, a delivery tube for atomized viscous fuel, and an oxidizing-medium delivery tube, said delivery tubes being spaced apart in substantial parallelism within the hollow interior of the burner barrel, and each having an open end exposed near the nose end of said barrel, separate heating jacket tubes surrounding said delivery tubes in spaced relation thereto and extending substantially the full length of the delivery tubes, means supplying atomized viscous '15 medium in the general direction of fuel ejection, and means deflecting the released heating medium as a protective screen transversely of the nose end of the burner barrel.

24. A self-cleaning burner of the class described, comprising in combination, an elongate hollow barrel having a forward nose end, a delivery tube for atomized viscous fuel, and an oxidizing-medium delivery tube, said tubes being spaced apart in substantial parallelism one above the other within the confines of the hollow barrel, and each having an open end exposed near the nose end of the barrel, a support member bored to receive snugly the open end portions of the delivery tubes, said bores being cut away outwardly along a limited portion of their circumference, at locations beneath the fuel delivery tube and above the oxidizing-medium delivery tube, to provide jets adjacent to the peripheral edges 'of the delivery tubes, and means supplying a high pressure fluid to said jets, traveling therethrough 16 forwardly of the burner nose and adjacent to the peripheral edges of the delivery tubes, to perform a cutting action upon solids dripping from the forward end of the fuel delivery tube.

JAMES WILLIAM PENNINGTON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 395,785 Hyland Jan. 8, 1889 465,268 Holden Dec. 15, 1891 713,697 Searing Q. Nov. 18, 1902 936,781 Kemp -1 Oct. 12, 1909' 955,092 McGahan Apr. 12, 1910 1,118,278 Greathead 1 Nov. 24, 1914 1,669,463 Garden May 15, 1928 1,774,306 Werner Aug. 26, 1930 1,797,125 Brackelsberg Mar. 17, 1931 1,873,996 Cunningham Aug. 30, 1932 2,457,304 Crowe Dec. 28, 1948 i a a

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