US2484161A - Fuel burner for boilers - Google Patents

Description

Oct. 11, 19 9. L

' w. M. FULTON 2,484,161 FUEL BURNER FOR BOILERS Filed April 4, 1944 v 4 Sheefs-Sheet 1 Oct, 11, 1949.

F iled April 4, 1944 w. M. FULTON 2,484,161-

FUEL BURNER FOR BOILERS 4 Sheets-Sheet 2 Oct. 11, 1949. w. M. FULTON EL BURNER FOR BOILERS 4 Sheets-Sheet 3 Filed April 4, 1944 Oct. 11, 1949. w. M. FULTON 2,484,161

FUEL BURNER FOR BOILERS Filed April 4, 1944 4 SheetsSheet 4 Patented Oct. 11, 1949 UNITED STATE FUEL BURNER FOR BOILERS- I Weston M; Fulton, Knoxville, Tenn, assignor to W. J. Savage Company, Inc.

, Knxville, Tenn.,

a corporation of Tennessee. 7 1

Application April 4, 1944, Serial No. 529,502-

This invention relates to an improvement in fuel burners for boilers,;particularly forthe heating of water for hot Water heaters, hot water furnaces or other types of boilers.

In my companion application on fuel burners,

Serial No. 529,503, filed April4, 1944, now Patent No. 2,444,985, granted July 13, 19.48, I have set forth an improved method of burning fuel, to-' gether with improvements in the burner construc-.

tion, that provide for the burning of solid fuel of different types under varying conditions, and obtaining maximum efliciency therefrom.

The object of this invention is to improve the construction of hot water heaters for boilers and other devices to apply the improved features and characteristics of my improved fuel burner thereto, obtaining the improved heating effect of the water and maximum efiiciency from the solid fuel.

This object is accomplished by utilizing a rotary burner into which the fuel is supplied, with provision for supplying air to the fuel bed along the sides thereof throughout only the portion of the burner covered by the fuel bed. The construction provides for the circulation of the water to be heated in heat exchange relation with the burner to obtain maximum heat transfer from the burner to the water, not only cooling the burner but also producing the desired heating effect of the water.

I have shown the invention applied in a preferred embodiment thereof, together with a modification, in the accompanying drawings, in which:

Fig. 1 is a side elevation of my burner construction applied to a hot water boiler;

Fig. 2 is a longitudinal sectional View through the burner, with parts in elevation;

Fig. 3 is a cross section therethrough substantially on the line .33 of Fig. 2, showing the burner;

Fig. 4 is an enlarged cross section through the burner wall;

Fig. 5 is a similar view showing a modified form of tuyeres; 1

' Fig. 6 is a side elevation of the outer end portion of the burner, showing in section a fuel feeding device; and

Fig. '7 isan end elevation thereof.

The invention is shown as applied to a domestic hot water heater or steam boiler for purpose-of illustration, although it will be evident that it may be used in various applications for heating water."

The invention utilizes a rotary burner designated generally by the numeral I, which is adapted to be mounted at its inner end on support 2, while its, outer end burner head 3;hereinaf-ter described more in de-' is supported by a tail. The burner I is adapted to be rotated in normal operation, for-,which purpose it is, pro-.1 vided with a surrounding. ring gear 4 adapted to be driven in any suitable manner, as by means of pinions 5 inrmesh therewith; a nd mounted on shafts 6 (Fig. 1) operated from a driving motor through any desired mechanism-,gas for'instance, by that set forth in myapplication on fuel burners, Serial No. 529,503., filed April-.4, 1944, to which reference is made; and this need not. be described more in detail-herein.

In mounting the inner end portion of the burner I on the mounting. plate 2,.I-have provided the periphery of the burner: with an annular flange I having the periphery, thereof formed as a section of a sphere from a center on, the axis of rotationof the burner l. A seatingringB is provided with a similarly shaped complementary seat 9 in the inner side thereof into which the'spherical portion of the flange l fits, thereby forming a flexible.

or adjustable ball joint between the members I, 8, which permitslthe burner l;to,be adjusted to different angular positions in theseating ring 8.

The seating ring B extends into a flanged por- I tion IIJ formed on thea'supportingv plate 2, but; is

of appreciably smaller external diameter than the interna1 diameter, of the opening within the flange ID of the plate 2, leaving ajspace I I therebetween. The space I-Iv is adapted to be filled with packing made ofheat refractory material, such as asbestos. This packing is held in place at the inner side of the space by a flange I2 on the supporting plate Zpand at the outer side, by a packing gland I 3. The packing gland I3 is shown as in the form of a ring of angular cross section, one flange of which vfits into the space I I between the members 8 'andilll, while the other flange thereof extends outwardlysubstantially parallel with a flange I4 formed on theseating ring 8.

Interposed between the flange I4 and the outturned flange of the packing gland I3,is a'series" of coiled compression springs I5, distributed at convenient intervals around the.-burner. springs have their opposite ends abutting against the flanges I3.and'-I4 so that the springs constantly exert aiforce tending-to .push the gland I3 to the right-in Fig; 2; and the seating ring 8,

to the left. This seating ring.,8,:in turn, tends to push the burner Ito the left, against the burner head 3 at the inlet end ofr the burner; thereby maintaining a firm sliding contact between the end surface'of'the-burner land the inner surface-of thelburner'headi. The con- These stant pressure of the springs also maintains the packing tight in the space thereby sealing the crack between these parts. The seating ring 8 is held against rotation with the burner by means of a stud l6 fixed to the supporting plate 2, and having its outer end loosely received in an opening |1 formed in an extended portion of the flange l4 below the burner.

The supporting plate 2 is mounted in upright position by means of bolts l8 embedded in a masonry wall l9, hereinafter described more in detail in connection with the boiler.

The burner head 3 is preferably concave or dish-shaped on its inner side, having an inner face 29 at the periphery thereof, bearing against the end of the burner at its periphery. This forms an upstanding support bearing againstthe open end of the burner in opposition to the seating ring 8, and permitting rotation of the burner relative to the head 3, while thereby closing the outer end of the burner. The head 3 is supported by legs or brackets 2| which are seated upon and secured to a base 22. .The'base 22 is supported upon adjusting screws 23 located at opposite ends thereof and resting upon the floor F of the boiler room. By adjusting the screws 23, it is possible to raise orlower the head 3 or tilt the latter, and therebytilt the burner l to different angular positions relative to the-horizontal, whereby the feeding of fuel through the burner may be increased or decreased in speed, as desired.

The burner head 3 is hollow and provided with a water jacket 24 therei'n extending throughout the major portion of the end of the burner for the circulation of water therethrough. As shown in Fig. 2, this water chamber-24 has an'inlet 25 at one side thereof and an outlet 26 at the opposite side, as hereinafter described; The head 3 has acentral hub portion 21.

The head 3 is provided also with a circumferentially extending air box 28 that extends ar cuatelythroughout' the segment of the burner that "is covered normally by the fire bed in the burner, as shown in Fig. '7. This air box 28 is open throughout its inner edge at the inner face of the burner to supply air thereto. The air box 28 is provided with an air inlet 29 adapted to be coupled with a pipe 30 that extends from a blower 3| mounted on the base 22 and operated by an electric motor 32 in the usual way.

Referring to Figs. 2, 3 and 4, the burner I is composed of an inner wall 33 of somewhat irregular form in longitudinal section as shown in Fig. 2, and also being of zigzag form in cross section, as shown in Figs. 3 and-4, and an outer wall 34. The walls 33 and 34 are joined together at 35 at the outer end of the burner, leaving thespace within the wall 33 entirely open atsaid end, but covered by the head 3 thereof, while the wall 35 is in bearing relation against the face 20 of the head. At the opposite or innerend of the burner, the space within the endof the inner wall 33 is closed by an end wall 36, while the outer wall 34 is closed by an end wall 31. The space between the walls 33 and 34 forms a continuous open 1 water chamber 38.

Referring to Figs. 3 and 4, the zigzag shape of the inner wall 33 provides within its folds alter nating' air passages.39 and water passages 40. The water passages '40 are in open communication at their outer sides with the water chamber 38 between the walls 33 and 34. The sides of the folds forming the air passages 39 converge toward i the center of the burnerrand'are slightly separated at the inner. face. of the wall by slots 4| sages 39 and tuyres 4| into and through the fuel bed in the burner to support combustion in the burner and causing the gases liberated from the coal or other fuel to be carried to the surface of the fuel bed for complete combustion. At the same time, the circulation of the water through the water passages 40, alternating with the air passages 39, serves to cool the outside of the burner by carrying heat away from the burner in the water circulated through the heating system, thereby obtaining maximum efficiency in the operation of the burner.

As shown in Fig. 2, the air passages 39'and slots 4| extend lengthwise of the burner from the intake end thereof adjacent the wall 35 to a point adjacent the opposite end of the burner where an annular flange or wall 42 closes the ends of However, the flange or wall 42 has small orifices 43 there through adjacent the outer portions of the air the air passages 39 and slots 4|.

passages 39 in communication therewith to allow some air to be discharged lengthwise from the air passages carrying out of them any ash that may have dropped into the air passages through the slots 4|.

Spaced toward the inner end of the burner fromthe wall 42 is an inwardly extending fold formed in the inner wall 33, as indicated at 44, within which fold is an extension of the water chamber 38. This fold 44, spaced axially from the inner ends of the air passages 39, provides an ash collecting space or chamber 45 adjacent the ends of the air passages. The discharge into the chamber 45 from the orifices 43 also completes the combustion in the chamber 45 of any small por-- tion of the fuel which passes into this chamber. 1

The chamber 45 has a discharge opening 45 through the infolded portion 44 into a discharge chamber 41 that is located between the infolded wall portion 44 and the end wall 36 that closes the inner end of the wall 33 of the burner. discharge chamber 41 is provided with a series of discharge openings 48 formed as passageways through the walls 3334 to discharge the prod-- nets of combustion from the burner as the latter is rotated.

Extending lengthwise through the burner from end to end thereof is a pipe 49. At the inner end of the burner, the pipe 49 extends through the wall 36 and has an Lip-turned end portion 5|] that extends to a point adjacent the inside surface of the other wall 34 of the burner.

Telescoped over the pipe 49 is a pipe 5l.' The pipe 5| is of appreciably larger inside diameter than the external diameter of the pipe 49 to provide a free water passage therebetween as will be evident from Fig. 2. At the inner end of the burner, the pipe 5| is sealed with a water tight joint to the end wall 36 and is in open communication with the water chamber 38 between th'e walls '36 and 31. 5

At the outer end of the burner, both of th I pipes 49 and 5| extend through the-hub 21"of the burner head 3 and into or through. a cylindrical fitting 52. The pipe 49 haszits' outer end The threaded into an end closure 53 sealed to the end of the fitting 52 by a detachable connection therewith as indicated generally at '54, sealing a water chamber 55 in said fitting. The opposite side of the chamber 55 is sealed by a packed piston 56-form'ed or secured on the end of the pipe 5|, and which piston 56 separates the chamber 55 from a chamber 51 also formed in the cylindrical fitting 52. The chamber 55 is in open communication-with the interior of the pipe 5| for free circulation of water therethrough.

A pipe 58 is sleeved over the pipe 5|, extending inwardly from the inner end of the cylindrical fitting 52, through the hub 21 and into the open end of the burner I. The pipe 58 has a packed piston connection 59 in sealing relation with the inner surface of the hub 21 of the burner head 3=,'maintaining the sealing relation during rotation of the pipe relative to said head. The pipe 58 extends into the inner end of the fitting-52 and has the space therearound sealed by a packing gland 60 at the open end of said fitting.

The pipe 58 is of appreciably larger internal diameter than the external diameter of the pipe 5| forming a water passage therethrough from the chamber 51. At the inner end, the pipe 58 is sealed by a water tight joint with an end closure flange 6| surrounding the pipe 5|, but the water is discharged from the pipe 58 at said inner end through radially extending tubes 62 that extend outwardly from the pipe 58 to the inner wall 33 of the burner where they are in open communication with the water chamber 38, as shown in Fi 3.

Although the interior combustion chamber of the burner is substantially cylindrical and of uniform diameter throughout its length, the outer wall 34 of the burner is preferably frustoconical with its larger end at the discharge end of the burner, which facilitates the circulation of the water through the water passages and chambers, as indicated by the arrows in Fig. 2.

Although the invention may be applied to any desired system for utilizing hot water, it' is shown as applied to a steam boiler 63 (Fig. 1) which may be of conventional or well-known construction. The boiler 63 has a main steam outlet pipe 64 leading to the radiator system or other point of utilization of the steam.

- The water jacket of the boiler 63 has a connec- :i'

tion 65 near the lower portion thereof by which an outlet pipe 66 is connected with the boiler. The pipe66 extends outwardly and downwardly from the connection 65, and passes transversely under the burner, as shown in Fig. 7, thence lengthwise in an outward direction, as shown in Figs. 2 and 6. The pipe 66 has a connection 61 leading therefrom to the inlet of the water chamber 24 in the burner head 3. Another connection from the pipe 66 is indicated at 68, leading to; the water chamber 57 in the cylindrical fitting 52.

A pipe 69 leads from the water chamber '55 upwardly'and inwardly therefrom toward the boiler 63, and the pipe 69 is connected with the upper portion of the boiler 63 just below the water line at the point 10. The pipe 69 is connected also with the water chamber 24 through a connecting pipe A pipe 12 is connected with the coupling member 53 in alignment with the pipe 49 interconnected therewith, and extends therefrom inwardly and upwardly beside the boiler, as shown in Fig. 1, to a steam and water separator 13 of any well-known design. Theseparator .13 is iii connected by'a nipple 14 to the steam outlet pipe 64 of the boiler to discharge any steam from the separator 13 into said steam outlet ipe. The steam separator 13 is provided also with the usual water collecting chamber 15 arranged to discharge its water into the boiler 63 through a pipe 16 leading to the connection 10. These parts are connected in the usual steam loop, operated in the usual way well known in the art.

The burner is here shown as located at one side of the boiler 63. An opening 11 is formed in the ash pit 78 of the boiler to admit hot gases ber 19 may be plastered with a layer of fire clay so that it will retain the heat and thereby present a hot surface to the gases passing therethrough. If desired also, the sides of the chamber 41 may be plastered likewise with fire clay.

Although any suitable means may be used for feeding fuel into the burner I, such for instance as that set forth in my copending application on fuel burners, Serial No. 529,503 filed April 4, 1944, I have shown another form of fuel feeding device applied to this burner, as illustrated inFigs. 1 6 and 7.

The burner head 3 has a fuel inlet 8| which is located at the right of the center of the head 3, as shown in Fig. 7, in order to avoid interfering with the pipe connections described above. The fuel inlet'8l extends outwardly and upwardly from the burner head 3, and then is turned back at an angle thereto, as shown at 82, whereby the portion 82 is out of direct alignment with the opening into the burner. The section 82 is connected directly with an extension 83 of a fuel hopper 84. The hopper 84 is seated upon a saddle 85 supported by a pedestal 86, which extends down to and is mounted upon the base 22. l

A conveyor screw 81 is provided within the bottom of the hopper 84 mounted on a shaft 88 that is adapted to be rotated in any desired manner, preferably by power, such as an electric motor drive, one form of which was shown in my copending application on fuel burners, Serial No. 529,503, filed April 4, 1944. It is sufficient that the conveyor screw is driven at such speed as will gradually feed the fuel from the hopper 84 into the passages 8|-82 through which the radiant'heat emitted-through the passagewaysill-82 from the interior of the burner because radiant heat travels only in straight lines. Con-' sequently any fuel that may remain at the discharge opening of the hopper cannot be ignited by radiant heat from Within the burner;

The fuel inlet BI is provided with an'access opening in a side thereof adapted to be closed normally by a door '89. One side of the door is hinged to the inlet 8| to swing open and uncover said opening, while the opposite side is provided with a suitable fastening 90 which will hold the door in closed position and permit it a avigorous fire, and continued with hand feeding until the fire is burning satisfactorily in the burner. The fan or blower 3| may be started by the motor 32 to promote combustion in the burner and continued in operation during such hand firing and thereafter.

- When a satisfactory fire has been started and a fire bed accumulated in the burner, the door 89 may be closed and the burner then operated mechanically. The rotation of the burner would then be started by establishing a driving connection to the shafts 6 and the shaft 88 operated to feed fuel from the hopper 84 into the upper end of the fuel passages 8l-82. This fuel drops through the fuel passage into the open end of the burner near the lower edge of the fuel bed as maintained generally at one side of the center of the rotating burner substantially in the relation described more in detail in my copending application on fuel burners, Serial No. 529,503, filed April 4, 1944. The feeding of fuel should be regulated according to the amount of heat desired, as by means of the usual or well-known stoker regulators.

Air is supplied to the burning fuel in the burner l by the operation of the blower 3|, through the pipe 30 into the wind box 28, which discharges into the ends of the air passages 39. This wind box supplies air to only those air passages 39 that are underneath the fuel bed in its normal position in the lower left hand segment of the burner rotated in clockwise direction and extending to a point somewhat above the transverse horizontal center line of the burner. The air is discharged through the slots M from the passages 39 into and through the fire bed, where it serves not only to support combustion but also to carry upward from the underside of the fuel bed the gaseous products liberated fro-m the burning fuel in a manner described more in detail in my copending application on fuel burners, Serial No. 529, 503 filed April 4, 1944.

The ashes are carried out of the burner through the chamber 45, opening 46, and chamber 41, falling by gravity therefrom through the openings 48. These ashes may be collected and discharged in any desired manner, such for instance, as that set forth in my copending application.

As combustion proceeds in the burner, the water in the chamber 38 becomes heated. This sets up a convectional circulation, causing relatively cold water to flow from the bottom of the boiler 93 through the pipe 66, from whence a portion thereof is discharged through the connection 61 into the water chamber 24 in the head 3, and the remainder flows through the connection 68 into the chamber of the cylindrical fitting 52. The water from the chamber 51 flows through the pipe 58 into the tubes 62, thence into the water chamber 38 between the walls of the burner.

The circulation of the water causes it to flow lengthwise of the burner from left to right in Fig. 2 until it reaches the portion of the water chamber 38 between the walls 36 and 31. There the water enters the open end of the pipe 5| and travels therein through the center of the burner. A portion of the water from this water chamber also flows into the up-turned end of the pipe 49 through which it flows lengthwise of the burner through the center thereof. The water flowing through the pipe 5| is discharged into. the chamber 55, from which it is directed through the pipe 69 to the top connection 10 of the boiler 63. The portion which flows out throu h the pipe 49 passes through the pipe 12 to the separator 13, the Water therefrom dropping through the pipe 76 into the boiler at the connection 10. The water which flows through the water chamber 24 from the connection 61, passes out through the pipe H, thence through the pipe 69 to the boiler as described above.

It will be noted that the pipes 5| and 58 rotate with the burner while the pipe 49 remains stationary, together with the head 3 and the cylindrical fitting 52. Consequently, the up-turned end 50 remains in the position shown in Fig. 2, so that any steam which may form in the water chamber 38 is discharged through the pipe 49 into the separator 13 for supply of the steam therefrom to the steam pipe 64. The steam loop described also promotes the circulation of water and the escape of steam.

The packing rings used in the piston connections and 59 form tight joints where the pipe 5| rotates relative to the cylindrical fitting 52 and where the pipe 58 rotates relative to the hub 21. These prevent leakage between these parts during the operation of the burner.

On large heating installations where very rapid circulation may be required, a power driven circulating pump may be installed in the pipe 63 at some convenient place, such as is indicated at 92. The use of such a pump would serve to increase the circulation through the system when the burner is operated.

The air passages 39 and their outlet slots 4| may be so constructed as to progressively increase the amount of air discharged from the slots from the inlet to the outlet end of the burner, if desired, so as to distribute the air more uniformly along the length of the burner and to prevent its natural tendency from flowing toward the discharge end of the burner before passing out through the slots 4|. This may be accomplished by the location of baffles, as shown at I39, spaced along the length of the air passages 39 and of progressively increasing height from the inlet toward the discharge end of the burner, as shown in Fig. 2.

Instead of discharging the air radially from the air passages 39, as indicated in Figs. 3 and 4, the burner may be constructed, if desired, to provide a tangential or circumferential discharge of the air from the tuyeres, as shown in Fig. 5. Such a tangential discharge may be provided in various ways, but it is accomplished effectively by securing plates l4! over the discharge slots from the air passages 39' as shown in Fig. 5. The plates l4! then direct the air discharged from the air passages in a circumferential direction around the inner wall 33'. and also tend to keep fly ash from falling into the air passages of the burner.

I claim:

1. In a furnace, the combination of a rotary burner for solid fuel, said burner comprising a surrounding wall structure of elongated tubular Ithe interior of the burner, means for admitting air to the air passages, and means mounting. the burner for rotary movement.

2. In a furnace, the combination of a rotary burner for solid fuel, said burner comprising a surrounding wall structure of elongated tubular form enclosing a combustion chamber adapted to receive a fuel bed of solid fuel therein, means forming air passages through said wall structure and having discharge openings therefrom in the combustion chamber, means forming a water jacket in the wall structure externally of the air passages and in heat exchange relation therewith and with the interior of the burner, means for admitting air to said air passages, means for admitting solid fuel into the rotary burner, and means for mounting the burner for rotary movement about an approximately horizontal axis.

3. In a furnace, the combination of a rotary burner for solid fuel and comprising an elongated tubular wall structure enclosing a combustion chamber adapted to contain a fuel bed therein, said wall structure having a plurality of air passages extending lengthwise of the burner about the combustion chamber and having openings in said chamber substantially along the length of said chamber, means forming a water jacket in the wall structure externally of the air passages and between air passages in heat exchange relation therewith and with the interior of the burner, means mounting said burner for rotary movement about an approximately horizontal axis, means for admitting air to said passages during said rotary movement, means for feeding solid fuel into the burner, and means for circulating water into and out of the water jacket.

4. In a furnace, the combination of a rotary burner for solid fuel and comprising a surrounding wall structure enclosing a combustion chamber adapted'to receive a fuel bed therein, means connected with the wall structure for admitting air into the combustion chamber, means forming a water jacket around the combustion chamber in heat exchange relation therewith, means mounting said burner for rotary movement, and means extending into said combustion chamber and connected with the water jacket for circulating water into and out of said water jacket.

5. In a furnace, the combination of a rotary burner for solid fuel and comprising an elongated tubular wall structure enclosing a combustion chamber constructed to contain a fuel bed in the lower portion thereof, said wall structure having an open end and having a water jacket therein in heat exchange relation with the combustion chamber, a burner head closing said open end and in bearing relation therewith, means mounting the opposite end portion of the burner for rotary movement, means for supplying air to the portion of the combustion chamber covered by the fuel bed, and means for circulating water into and out of the water jacket during rotation of the burner.

6. In a furnace, the combination of a rotary burner for solid fuel and comprising an elongated tubular wall structure enclosing a combustion 10 chamber adapted to contain a fuel bed therein, said wall structure having an open end and having-a water jacket therein in heat exchange relation with the combustion chamber, a burner head closin said open end and in bearing relation therewith, means mounting the opposite end portion of the burner for rotary movement, and means for circulating water into and out of the water jacket including a pipe connection extending axially through the burner and connected with the water jacket adjacent one end of the burner and a separate pipe connection for the opposite end portion of the burner.

'7. Ina furnace, the combination of a rotary burner for solid fuel and comprising an elongated tubular wall structure enclosing a combustion chamber adapted to contain a fuel bed therein, said wall structure having an open end and having a water jacket therein in heat exchange relation with the combustion chamber, a, burner head closing said open end and in bearing relation therewith, means mounting the opposite end portion of the burner for rotary movement, and means for circulating water into and out of said water jacket and'including pipes telescoped with each other and extending through the burner axially thereof forming respective passageways therethrough, one of said. pipes extending to the top portion of the water jacket for discharging steam therefrom,'and means extending into the opposite end portion of the burner and connected with the water jacket for circulation of water therethrough.

8. In a furnace, the combination of a rotary burner for solid fuel and comprising an elongated tubular wall structure enclosing a combustion chamber adapted to contain a fuel bed therein, said Wall structure having an open end and having a waterjacket therein in heat exchange relation with the" combustion chamber, aburner head closing said open end and in bearing relation therewith, means mounting the opposite end portion of the burner for rotary movement, and means for circulating water into and out of the water jacket comprising pipes connected respectivelywith the opposite end portions of said water jacket, a fitting connected with said pipes and having chambers therein in communication with the'respective pipes, and means for circulating water into one of said chambers and out of the other of said chambers.

9. In awfurnace, the combination of a rotary burner for solid fuel-and comprising an elongated tubular wall structure enclosing a combustion chamberadaptedl to contain a fuel bed therein, said wall structure having an open end and having a Water jacket therein in heat exchange relation with the combustion chamber, a burner head closing said open end and in bearing relation therewith, means mounting the opposite end portion of the burner for rotary movement, and means for circulating water into and out of the water jacket comprising pipes connected respectively with the opposite end portions of said Water jacket, a fitting connected with said pipe and having chambers therein in communication with the respective pipes, means for circulating water into one of said chambers and out of the other of said chambers, said burner head having a water chamber therein, and means for circulating water through said water chamber and connected with the Water supply means of the fitting.

10. A rotary burner comprising a tubular wall structure enclosing a combustion chamber, said Wall structure having an open end, a burner head fitted over said open end and in bearing relation tubular wall structure enclosing a combustion chamber, said wall structure including outer and 'innerwalls enclosing a water jacket therebetween,

an end wall structure closing an end portion of the burner, said inner Wall having an inturned portion between said combustion chamber and i the end Wall structure and cooperating with the end wall structure to form a chamber in said end portion of the burner and having an opening therein for communication between the combustion chamber and said end chamber to receive products of combustion therefrom, and said end chamber having an outlet through the surround-- ing wall structure of the burner to discharge the products of combustion therefrom.

12. A rotary burner comprising a tubular wall structure enclosing a combustion chamber and having an open end, a burner head extending over said open end to close said end, means mount- .ing said burner head for bearing relation of one end of the burner thereagainst during rotary movement of the burner, and means mounting,

the opposite end portion of the burner for rotary movement, said means comprising a support, a ring surrounding the burner and bearing there on, and means interposed between the support and said ring, and normally tending to move the burner toward the burner head to maintain the bearing relation thereagainst during rotation of the burner.

13. In a furnace, the combination of a rotary burner comprising a surrounding wall structure of elongated tubular form enclosing a combustion chamber, means forming air passages lengthwise of the tubular portion of said wall structure and having discharge openings therefrom in the combustion chamber, means forming a water jacket in the wall structure externally of the air passages and in heat exchange relation therewith and with the interior of the burner, means for admitting air to said air passages and confining the admission of the air to the passages in the lower portion of the combustion chamber, and means mounting the burner for rotary movement.

14. In a furnace, the combination of a rotary burner comprising an elongated tubular wall structure enclosing a combustion chamber, said wall structure having an open end and having a water jacket therein in heat exchange relation with the combustion chamber, a burner head closing said open end and in bearing relation there with, means mounting the opposite end portion of the burner for rotary movement, and means for circulating water into and out of the water jacket during rotation of the burner.

15. A rotary burner comprising a tubular wall structure enclosing a combustion chamber, said wall structure including inner and outer walls separated from each other and enclosing a fluid chamber therebetween, said inner wall being formed approximately zigzag in cross section continuously around the burner providing spaced air passages extending lengthwise of the tubular wall structure and separated by fluid passages of approximately the same area as the air passages, each air passage being approximately triangular in cross section and having aconstricted opening approximately at the vertex thereof in communication with the combustion chamber, the air passages opening into the combustion chamber and the fluid passages opening into the fluid camber, and means for admitting air to the air passages for flow therethrough and discharge into the combustion chamber.

16. In a. furnace, the combination of a rotary burner for solid fuel open at one end, said burner comprising an elongated tubular wall having a fluid jacket therein in heat-exchange relation with the interior of a burner, means mounting said burner for rotary movement and including a stationary head covering said open end of the burner, and means for circulating fluid into and out of the fluid 'jacket and head of the burner during rotation of said burner.

WESTON 'M. FULTON.

REFERENCES CITED .The following references are of record in the file of this patent:

UNITED STATES PATENTS 2,165,802 Longtin- July 11, 1939

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