Патент USA US2111928код для вставки
March 22, 1938. 2,111,928 R. M. HARDGROVE FU EL BURNER . Fi'led Aug. 20, 1929 4 Sheets-Sheet 1 FIGl. t March 22, 1938. ' R. M. HARDGROVE I FUEL 2,111,928‘ BURNER Fil-ed Aug. 20, 1929 4 Sheets-Sheet 2 BY ATTOR N EY March 22, 1938. R, M, HARDGROVE 2,111,92@ FUEL BURNER Filed Aug. 20, 1929 4 Sheets-Sheet Z March 22, 193%. ' M. HARDGROVE 2,131,928 FUEL BURNER Filed Aug. 20, 1929 ‘4 sheets-sheet 4 2,111,928 Patented Mar. 22,v 1938 ‘UNITED’ STATES PATENT. OFFICE * 2,111,928 1 FUEL BURNER . Ralph M. Hardgrove, Bethlehem, Pa., assignor, by mesne assignments, to ThevBabcock & Wilcox Company, Newark, N. 3., a corpora tion of New Jersey . I ‘ Application August 20, 1929, Serial No. 387,214 __ 24 Claims. (Cl. 122-235) This [invention relates to a burner that is espe cially useful for burning’ pulverized coal. The invention will be understood from the description in connection with the accompanying drawings, 5 in which Fig. 1 is a vertical section through an illustrative embodiment of the invention; Fig. 2 is a partial rear view of the structure shown in Fig. outlet walls 9 to form a series of transversely spaced‘ vertically elongated nozzles discharging through the intertube spaces. Inlets l0 and II are provided above and below the outlet 8 for secondary or combustion air. Each air inlet I l is shown ‘to be of greater vertical cross sectional area and height than the inlet l0 1; Fig. 3 is a plan view, partly in section, showing the burner; Fig. 4 is a plan view of one of the 10 details; Fig. 5 is a section along the line 5-5 of Fig. 4; Fig. 6 is a section along the line 6-8 of Fig. 5; Fig. '7 is a perspective view partly in sec tion of thefuel burner with the de?ector blocks and some of the wall tubes omitted; and Fig. 8 15 is a horizontal section showing the relative ar rangement of the de?ector blocks and tubes. / In- the drawings, reference character I indi cates a furnace having vertically disposed spaced thereabove. - . ' I Angle-irons‘ I2 and I3 extend along the outside of the furnace wall and are connected to brackets 10 14 on the burner 5 by means of rods l5 that are provided with turn buckles l5’. ~ . . A row of de?ecting blocks I6 is provided along the furnace side of the tubes 2 opposite the out let 8. These blocks l6 may be held in-place 15 against the tubes 2 by means of 'U-bolts H which ?t around the shields 8a. The blocks l6 are prm vided with curved surfaces l8 to ?t against the tubes-and with countersunk openings IQ for nuts on the ends of the U-bolts II. The front sides of 20 the blocks It or the sides toward the burner 5 are rounded, as indicated at 20, to divide each ver ‘ tubes 2 in its wall. The tubes 2 have their ends connected to a header 3 outside of the furnace. 20 _ ‘The tubes may have water or other cooling fluid circulated through them in the well-known way. The tubes are lined with blocks 4 to provide a tically elongted stream of incoming fuel and pro- 1 ject it in two sheets, one inclined upwardly and. continuous wall. Some of the blocks 4 are vomit tedv to provide a location for the fuel burner. The the‘ other downwardly,-so that these sheets of fuel 25 , willbe struck by the air entering through the fuel burner has a long narrow mouth or exit opening which extends across a plurality of the ports 10 and II substantially at right-angles. Plates 2| and 22 are attached to the outlet 8 tubes, so that fuel from the burner passes into the furnace through a number, of spaces between to de?ne one side of each inlet l0 and II. A the‘ tubes 2. 30 v . p > The burner 5 is connected to a ?aring connec tion 6, which is in turn connected with a fuel 'delivery pipe 6“. The burner 5 is disposed at an angle to the fuel delivery pipe 6“, and the ?aring connection joining the burner and the fuel de livery pipe is provided with a sloping wall 1 against which the mixture of air and powdered damper 23, somewhat conventionally shown in Fig. l of the drawings, is pivoted at 24 to the bracket 25 above the plate 21 and a loose damper 26 is pivotally attached at 21 to a bell crank 28 pivoted at 29. The damper 2,6 in its full open position rests upon a supporting plate 25“, against ' which thelower portion ofthe damper continu ously contacts when the damper is turned by the fuel from any-convenient source impinges so that bell crank 28. ‘Rods 30 are provided for operating the mixture will spread out laterally substantially . the dampers 23 and, 26, so that the inlets Ill and 40 uniformly in the horizontally extending portion of the burner 5. The sloping wall 1 stands at an angle to- the axes of the fuel delivery pipe and the burner, as will be realized upon. examination of ' Figure -1. An’ outlet 8 is connected to the exit end of the burner 5 and may be attached to the tubes 40 H can be partially or entirely closed. casing 3| surrounds the burner and dampers .and may be supplied with air under pressure in any convenient way. A port 32 for a lighter may extend through the casing 3| into proximity to‘ the outlet 8 for lighting‘- the fuel. 45. The burner extends laterally and converges in a vertical plane and ?are_s,_-horizontally toward across a numberof the tubes and is provided‘ with ' ' the outlet 8, thus causing the-incoming mixture outwardly ?aring upper and lower walls 9. Each 'of air-and fuel to spread out horizontally in a vof ‘the tubes 2 has itsouter side contacting with thin sheet. ’ The sheet is divided by the fuel the concave side of a crescent shaped shield 8*, ’ nozzles formed in the outlet section 8 into a row as shown in Fig. 3, the upper and lower edges of which fit into recesses formed in the upper and of horizontally spaced vertically‘ elongated fuel '1 lower walls 9 of the burner outlett, as shown in streams, each of which strikes‘a corresponding Fig. 1. With this arrangement-‘of the shields 8‘ vde?ector block l8 and passes in twoportions in in the burner outlet 8, the shields unite with‘ the such directions that the streams of air entering ‘ 2 in any convenient manner. The outlet 8 extends ‘ I _ _ 55 2 2,111,928 through the inlets I0 and II are struck substan tially at right-angles, thus intimately mixing the fuel and combustion air. In this way, prac tically the entire volume of the furnace can be 8. In a furnace, a wall, vertically disposed cool ing tubes in said wall, a horizontally elongated fuel nozzle extending across a plurality of said tubes and a de?ector block mounted on two ad— .iacent tubes on the furnace side of said fuel u . A series of blocks 33 form a drip ledge posi tioned above the upper secondary air inlet in, 1 nozzle. that is to say, over the secondary air-ports and 9. In combination, a pulverized‘ fuel and air de fuel outlets. The blocks 33 are held in place livery pipe, a fuel burner nozzle arranged at an by being fastened to the cooling tubes 2 in the , angle to said delivery pipe, a conduit section con utilized very effectively for combustion. wall. The function of this drip ledge is to pre vent clogging of the ports by liquid ash or slag which may ?ow down the wall from above the ports. 15 I claim: 1. In combination, a furnace having vertically disposed tubes along a wall thereof, a burner having a narrow exit opening extending across 20 a plurality of said tubes, and a de?ector in front of said opening, said de?ector being at tached to said tubes. ‘ ‘ > ‘ 2. In combination. a furnace having vertically disposed tubes along a wall thereof, a burner hav 25 ing an exit opening extending across a plurality of the wall tubes, a secondary air conduit also extending across a plurality of the wall tubes, and a de?ector in front of the exit opening of said burner, said de?ector being attached to the wall necting said delivery pipe and nozzle and. com prising a fuel distributing plate arranged at an 10 angle to the axes of said delivery pipe and nozzle to receive the impact of the fuel from said deliv ery pipe and distribute the fuel therefrom throughout said nozzle, said nozzle having an outer section progressively ?aring in one direc tion and progressively tapering in a transverse directionfrom the discharge end of said con~ necting conduit section, and a nozzle discharge section ?aring towards its discharge end in a 20 direction transverse to the direction of ?are of said outer nozzle section. 10. In combination, a furnace wall having a fuel burner port formed therein, a fuel burner nozzle arranged to discharge fuel through said 25 burner port in a series of streams extending transversely of the direction of fuel discharge, means at the inner side of said furnace wall and tubes, and serving to direct the fuel into the 30 secondary air. immediately beyond the discharge end of said 3. In combination, a furnace having vertically disposed tubes along a wall thereof, a burner nozzle for dividing each fuel stream into a plu rality of streams diverging in a plane transverse ly of theseries of fuel streams, and means for 35 rality of wall tubes, means to cause streams of discharging a stream of ‘combustion air through said burner port into each of said diverging fuel streams. air to enter said furnace along opposite sides of said burner in angular‘ relation thereto,‘ and 40 angle to said air streams. 4. In combination, a furnace having vertically 11. In combination, a furnace wall having a fuel burner port formed therein and spaced cool ing tubes extending across said burner port, a fuel burner nozzle arranged to discharge a fuel ?aring in a horizontal plane toward its exit end extending across a plurality of the wall tubes and versely of the length of said cooling tubes, de?ec tors mounted on‘ and extending across the spaces 35 disposed cooling tubes in a wall thereof, a burner _ stream through said burner port elongated trans between said/ tubes and immediately beyond the discharge end of said nozzle for dividing the fuel being mounted on and in ther mal contact with said tubes. 5. In combination, a furnace having vertically disposed cooling tubes in a wall thereof, a burner ?aring in a horizontal plane toward its exit end, agsecondary air conduit having an opening ad jacent the exit end of said burner, and means for ‘stream passing through the intertube spaces into a plurality of streams diverging in a plane trans versely of the direction of elongation of the main fuel stream, and means for discharging‘streams of combustion air through each of said intertube spaces into said diverging fuel streams. 12. In a furnace, a substantially vertical wall 50 having a fuel burner over a plurality of being mounted on the tubes. 60 6. In combination, a furnace having vertically a wall‘v thereof, a said burner port and fuel burner by solid deposits from above. 60 13. In combination tubes, and means to cause secondary combustion air to mix with material from said burner after it has struck said de?ector. 7. In a furnace, a wall, vertically disposed cool ing tubes in said wall, a horizontally elongated fuel nozzle extending across a plurality of said tubes, a secondary air-port adjacent said fuel 65 70 nozzle vsubstantially‘ coextensive therewith, and a drip ledge block in said wall over said fuel nozzle 75 and saidlsecondary air-port. _ 75 8,111,928 14. In a burner for pulverized fuel, a single fuel distribution conduit terminating in a plu rality of fuel nozzles spaced along a furnace wall. means forming a plurality of downwardly in clined ainpassages located above said nozzles and means forming‘ a plurality of upwardly in clined air passages located below said nozzles stream closely adjacent its; point of entry into the furnace. ' I \ ' _' ' V - ‘19. In combination, a furnace wall including a series of transversely spaced wall tubes, a series of transversely spaced pulverized fuel nozzles adjacent said wall tubes and constructedv to dis charge a plurality of fuel-streams through sep whereby the air jets‘ discharged therefrom are arate intertube spaces at an oblique angle to said caused to impinge upon the fuel Jets discharged ‘furnace wall, and means for directing streams of combustion air through said intertube spaces at 10 from said nozzles, and means at the discharge an oblique angle to said furnace wall and in a end of said air passages for selectively controlling I‘ the velocity of air discharged ‘from said upper direction to impinge upon corresponding fuel streams adjacent said furnace wall. and lower air passages without changing the ini 20. In combination, a vertically extending fur; tial point ofimpingement of said air. streams on ' nace- wall having a burner'port formed therein 15 ~ . , I 15 said fueljets'. ,_ 15. In combination, a furnace wall comprising and a series ‘of transversely spaced wall tubes extending across said burner port, a combustion air casing at the outer side of said furnace wall wall and comprising a ?ared fuel conduit having and surrounding said burner port, a series of transversely spaced pulverized fuel nozzles ‘ad 20 its discharge end extending transversely across jacent said wall tubes and constructed to dis the outer side of a plurality of said wall tubes charge a plurality of fuel streams through sep and terminating in a series of separate fuel noz zles, said nozzles being spaced apart and ar - arate intertube spaces, and means for directing streams of combustion air from said casing ranged to discharge‘ fuel through separate inter through said intertube spaces at an oblique an 25 tube spaces at‘ an-oblique angle to said furnace 25 wall, and means forming an air passage through gle to said furnace wall and in a direction to im each of said intertube spaces directed towards pinge upon corresponding fuel streams adjacent said furnace wall. ' and adjacent to the discharge end of the corre 21. In combination, a vertically extending fur sponding fuel nozzle. , _ nace wall having a burner port formed therein 30' 16. In combination, a vertically extending fur 30 nace wall having a series of horizontally spaced and a series of transversely spaced wail tubes cooling tubes extending along its inner side, a extending across said burner port, a combus pulverized fuel burner adapted to discharge tion air casing ‘at the outer side ‘of said furnace through said wall and comprising a ?ared fuel wall and surrounding said ‘burner port, a pul verized fuel conduit extending through said cas :35 35 conduit having its discharge end extending trans versely across a plurality of said wall tubes and ing and having its discharge endv extending trans terminating in a series of separate vertically versely across the outer side of a plurality of _ said wall tubes, said conduit terminating in a elongated fuel nozzles, said nozzles being hori a series of horizontally spaced cooling tubes, a fuel burner adapted .to\ discharge through said zontally spaced apart and arranged to discharge series of transversely spaced fuel nozzles adja ‘ wall tubes and constructed to discharge a plu fuel conduit extending through said casing and having its discharge end extending transversely cent said wall tubes and constructed to discharge 40. 40 a mixture of pulverized fuel and primary air through separate intertube spaces, and means a plurality of fuel streams through separate 'in for directing a stream of secondary air through tertube spaces, and means for directing streams each of said intertube spaces at an angle to ‘ of combustion air from said casing through said wards and impinging on, the corresponding fuel intertube spaces in a direction‘ to impinge upon and primary ‘air stream adjacent said furnace corresponding fuel streams adjacent said furnace wall. ' wall. 22. In, combination, a vertically extending fur- v 1'7; In combination, a vertically extending fur nace wall having a series of horizontally spaced nace wall having a burner port formed therein vertically arranged cooling tubes, a fuel burner and a series of transversely spaced wall tubes extending across said burner port, a combustion so adapted to discharge through said wall and com air casing at the outer side of said furnace wall ' prising a fuel conduit having its discharge end and surrounding said burner port, a pulverized extending transversely across a plurality of said rality of fuel streams through separate intertube spaces at an oblique angle to said furnace wall, across the outer side of a plurality of said wall 55 tubes, said conduit terminating in a series of and means for directing a stream of air through ' each of said intertube spaces at an oblique angle to said furnace wall and in a direction to im pinge upon the corresponding fuel stream. 18. In combination, a furnace wall having a ‘ so series of horizontally spaced cooling tubes asso ciated therewith, a fuel burner adapted to dis charge through said wall and comprising a fuel ‘conduit having its discharge end extending trans versely across a'plurality of said wall tubes and constructed to‘ discharge a plurality of separate fuel streams through separate intertube spaces with some of saidvfuel streams directed at one oblique angle .to said wall and other, fuel streams at a substantially opposite oblique angle to said wall, and means for directing a stream of air 1 transversely spaced fuel nozzles adjacent said wall tubes and constructed to discharge a-plu rality of fuel streams through separate intertubev spaces at an oblique angle to said furnace wall, so and means for directing streams of combustion air from said casing through said intertube spaces in a direction to impinge upon corresponding fuel streams adjacent said furnace wall. 23. In'combination, a furnace having a verti~~ 65 cally extending wall, a series of pulverized fuel nozzles constructed to discharge a plurality of fuel streams through said wall with some of said fuel streams entering the furnace at an' upward inclination to said wall and other-fuel 70 streams at a downward inclination to said wall, means forming a plurality of downwardly ‘in-. through each of said intertube spaces at an clined air passages located above ‘said nozzles ' ,. oblique angle to said furnace wall and ina direc- - and arranged to direct streams of combustion air ' ' 75 tion to, impinge upon the corresponding fuel to impinge upon corresponding upwardly inclined 4 9,11 1,988 fuel streems, and means forming a plurality of ' upwardly inclined air passages located below said nozzles and arranged to direct stre ams of com-' bustion air to impinge upon corresponding down Cl wardly inclined fuel streams. ' 2%. In a furnaoe, a, wall, vertically‘ disposed cooling tubes in said well, a honzontally elon ' gated fuel nozzle extending across a plurality of said tubes and air-ports aboveand below said fuel nozzle, the air-port below said fuel nozzle being of greater area than that above said, fuel nozzle. RALPH m HARDGROVE.