US1924123A

US1924123A - Means for feeding pulverized fuel to furnaces

Info

Publication number: US1924123A
Application number: US315337A
Authority: US
Inventors: Joseph E Kennedy
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-10-26
Filing date: 1928-10-26
Publication date: 1933-08-29
Anticipated expiration: 1950-08-29

Description

g- 29, 1933- J. E. KENNEDY 1,924,123

MEANS FOR FEEDING PULVERIZED FUEL T0 FURNACES Original Filed July 29, 1926 3 Sheets-Sheet l Ell @2122 elgy Aug. 29, 1933. J E, KENNEDY 1,924,123

MEANS FOR FEEDING PULVERIZED FUEL T0 FURNACES Original Filed July 29. 1926 3 Sheets-Sheet 2 lama " JZEKenne (Zq g- 29, 1933- J. E. KENNEDY I ,9

MEANS FOR FEEDING PULVERIZED FUEL TO FURNACES Original Filed July 29. 1926 3 Sheets-Sheet 3 anvemtoz ZZZ/fen ecil 331 21 s awe 014W Patented Aug. 29, 1933 *MEANS FOR FEEDING PULVERIZED FUEL TO FURNAGES Josph E2 Kennedy;New York; N: Y; ---Refi-ledv for -.abandcned' application wSeriaLNo.

This application Oc- -;-efficient in :use, the present application being a substitute for my application filed July-29,: 1926 Serial No. 125,716.

mixed with air; it is-desirable' at times that the fuel mixture" delivered at the-burner shall be -richerin coal than at other times, and especially -tion to provide an :improved burner- -means for fuel of this'character arranged with means where- 'by the quantity of the'pulverized coal may bein- E creased or decreased'inproportion tothe volume of-airto increase and 'decrease the quantity of the coal in the fuel mixture delivered to the burner s conduit with the fuel supply andfeeding means for firingin the furnace.

. For various reasons: not known; but possibly 7125. -due'to currents set up'and taking a definitepath f ---in thestream'of the fuel-as it is delivered to a- -burner, -the-fuel is deliveredby a burner so'thatf it is fired only fr-oma portion'of the burner, and it is a further-object of theinvention to provide adjustable-means to cause the deflectionv andfdirection of the fuel stream in a definite course as it enters'the burner and a consequent delivery of the fuel from all portions of the burner orifice, P and to adjust the burner to direct the burning fuel stream issuingfromthe burner to different parts of the firebox of the furnace. V

- I-t is another object of the invention to. provide l an improved; burner embodying a casing having passages therethrough one within the other and t'he other and one of which conduits and the con- 'nected burnerlmay beshut off fromthe fuel sup- .iply while the other is mai-ntained in connection:

" with the fuel supply.

I A further object of the invention relates tothe" -provisionof openings with removable closures'in the burner casing tothe passages-in the rear 'of .tionof 'branch'conduits toa mainconduit leadand'leading tothe' binnerorifices'for the entrance of'an implemntfor the removing of obstructions from the burner-passages without the new cessity fj dismantling the burner.

ln thelburning of-pulverizedfuel such as coal 'ing and outlet orifices, with-said end of. theburn- "of .theme'anstoshut'bifand variably open the :one conduit-to the fuel feeding means shown in *Figure 2 andshowing means for retaining the Figure 1 and looking toward'the left toshow the Other-objects andadvantages will hereinafter appear.

In carrying out my improved fuel =burning means I provide a burner casing. adapted for mounting in an openingleading to the firebox ofz-nso a furnace and having a plurality-of fuel passages 'therethrougharranged one within theuother with the walls of.the passages converging from'the inlet end of the passages to the outlet "orifices, whereby to constrict the-outletbrifice end of thecas-x05 er casing flattened-to elongate andlaterally reduce the area of the outlet orifices, the.-.-burner casing being mounted tohave adjustment: about its axis to direct the fire flame fromzthe'burnerr'm to different portions of the furnace; Each burner passage is arranged with a'separate fuelconducting conduit to connect the burner-passages with a fuel supply and *fuel feeding' means: with the conduit for one; burner arranged in ithe conduitliwhile :another conduit-is open;:to said means.

"Means are adjustably'arranged-in openings in the'80 connection of the burner casing .with the conduits to deflect the streams delivered from -saidconduits into different-parts of theburner passages, which meansmayberemoved and an implement passed through the openings to-removeobstruci tions in'the burner passages.

In. the drawings accompanying and forming a part of this application l-have shown an embodiment of my invention in which-Figure l is aside elevation of a burner-showing the conduitconnection' thereof with fuel feeding'means zand the burner mountedinielation to angopening of a furnace. r

Figure 2- is a perspective view of means arranged in the connection of'the burner conduits with the fuelfeeding means operativerto variably open .theouter conduit to the fuel feeding-.means orshutoifthe feeding means from.-said conduit.

Figure 3 isa cross sectional view of a portion closure-means in -closed;position. Figure 4 is a View taken 'on the line 4 -4 "of .1 Figure '1" looking'to' the right'to show the connecingfrom'the fuel delivery means.

Figure 5 is a viewtaken on vtheline 4--4 of connection of the main fuel delivery conduits with the fuel feeding means.

Figure 6 is a longitudinal sectional view taken through the connection between sections of the outer conduit to show the mounting of the inner conduit therein.

Figure 7 is a cross sectional view taken substantially on the line 7--'7 of Figure 6 looking in the direction of the arrow.

Figure 8 is a longitudinal sectional view through the burner casing and its connection means with the fuel delivery conduit and showing the manner of mounting the burner in an opening of a furnace and the arrangement of the fuel stream deflecting means in said connection means.

Figure 9 is an end elevational view looking at the outlet end of the burner.

Figure 1D is an end elevation of the fuel stream deflecting means arranged in the connection of the burner casing with the fuel conduits.

Figure 11 is a perspective view of the fuel stream deflector for the inner conduit and Fig. 12 is a perspective view of the fuel stream deflector for the outer conduit.

Figure 13 is an elevational view of connecting means of the burner with the fuel conduits, showing a modified arrangement of the means for defleeting the fuel stream to the burner.

Figure 14 is a side elevation of the burner in relation to an opening in the furnace and showing an adjustable mounting for the burner with the burner adjusted to direct the fuel stream downward.

Figure 15 is a view similar to Figure 14 but showing the burner adjusted to direct the fuel stream upward.

Figure 16 is a front elevational view and Figure 1'7 a perspective View of means interposed between the burner and its mounting support for adjusting the burner as shown in Figures 14 and 15.

Figure 18 is a View similar to Figure 16 showing a modified arrangement of openings in the adjustable member to effect adjustment thereof.

Figure 19 is a plan View, partly in section, of the burner showing a modified arrangement of the burner outlet orifices and the burner mounted in relation to an opening in the. furnace.

Figure 20 is a plan view showing the arrange ment of mounting a pair of burners in a single opening to a furnace, the burners being partly in section and showing a modified arrangement of the burner outlet orifices; and

Figure 21 is a perspective View, partly in section, of the burner shown in Figure 19.

In the embodiment of the invention illustrated in the drawings the burner comprises a casing (designated in a general way by B) having a series of passages therethrough, in the present instance two

passages

14, 15. The outlet orifice end of the casing is constricted to restrict the outlet orifices of the passages from the casing relative to the inlets thereto. For this purpose, and to facilitate the mounting of the burner casing and the connection thereof to conduits leading from a source of fuel supply, the inlet end of the casing passages are of circular form with the top and bottom wall portions of the passages converging toward the outlet orifice end, and the lateral wall diverging to the outlet orifice end, thus providing the passages with flattened and laterally elongated outlet orifices, as shown in Figure 9. The burner casing is preferably a casting and at the inlet end is arranged with the laterally extending flange 16 to mount the same, with the arranged at the opening to the furnace.

I members of said box having openings therein with adjustable closures, as shown at 20, for a supply of secondary air to the burning fuel stream issuing from the burner outlet, having deflectors 21 for directing the incoming air through said openings toward the burner.

Each of the burner passages is connected by separate and coaxially

conduits

22, 23 with a source of fuel supply and feeding means, comprising pneumatic suction means, such as a fan, shown in a conventional manner at N, having the intake 21' connected with a storage bin, or with disintegrating apparatus for coal, to draw pulverized coal therefrom and simultaneously mix it with air. The conduits are arranged one within the other and preferably concentric to each other. As shown in Figure 4 the fuel feeding means or fan N is adapted for feeding fuel to a pair of burners B and B leading to separate openings in a furnace or to two furnaces the

conduits

22, 23 being branch conduits leading from the main co-axial conduits 2'7, 28 leading from the fan. The outer conduit 23 is connected to the outer burner passage 15 by an elbow 24, while the inner conduit 22 is extended through said elbow. and has a slip joint connection directly with the inner burner passage 14, as shown at 25 (Figure 8).

The conduit 28 consists of sections connected by bolts passed through openings in flanged collars fixed on the conduit section, as at 29, while the sections of conduits 27 have a slip joint connection. The conduit sections 2'? are mounted in the conduit 28 by collars 30 clamped about said conduit sections with rings 31 clamped between the flanges of the conduit connecting collars 29, arms extending radially from said rings beingfixed to and carrying the collars 30 (Figures'6 and 7). The conduit 23 is connected at one end of the elbow 24 by a flanged collar 32 fixed to said conduit abutting a flange on the elbow 24 and secured by bolts engaging perforations in the collar and elbow flanges. The opposite ends of said conduit have a slip joint connection with branches leading from conduit 28, as at 33'. The conduits 22 have slip joint connections 34 with branches leading from conduit 27. By this arrangement the mounting of the

conduit sections

22 and 27 in

conduits

23 and 28 is facilitated and also the connection of the

conduits

22, 23 with the branches leading from conduits 2'7, 28.

The elbow 24 co-operates with the burner casing to mount the latter on the plate 19 of the box For this purpose the end of said elbow opposite to its connection with the conduit 23 has a laterally extending flange 33 to abut against the box plate 19 with bolts passed through said elbow flange, plate and burner flange, as at 34". It will be obvious that as the fan is in operation pulverized coal is drawn with air from'its source of supply and delivered by the fan into the conduits 2'7, 28 and delivered from the latter to the burner through the

branch conduits

22, 23. The conduits 2'7, 28

lead upwardfrom the fan at an acute angle to the vertical and then merge with a downwardly extending portion with a curve to a point where the

conduits

22, 23 branch therefrom, the latter conduits extending in ayvertical plane to a point where they are connected with the burner casing, the passages through the latter being arranged in a substantially horizontal plane. By this arrangement the particles of combustible coal are maintained in uniform density in the delivered stream. 7

vAs stated, it is desirable at-times to provide a fuel mixture of greater richness than at other times, particularly when igniting the fuel in starting the firing of a furnace, and for this purpose means are provided tovariably open or shut ofi the fuel feeding means from the burner through one of the

conduits

27,28. In the present arrangement means are provided to vary or shut off the connection of the conduit 28 with the fuel feeding .means. A box-like structure 34, which is in the nature of a valve casing, is mounted upon the fan casing in communication with the delivery opening thereof, (Figures 1, 2,3 and 5)- and a connector and support 35 is provided for connection of theuconduit 28 thereto, as at 36, in a manner similar to the connecting of the sections of said conduit, and connected to the casing 34 by bolts extending through flanges on said connector 35 and boxstructure 34, as at 37. The end section of the conduit 27 extends into the casing 34'slightly beyond the connection thereof with the connector 35, .as shown in Figure 3. Toshut'off the conduit 28 or variably open the same to the fan a pair of shutters 38 are pivotally mounted upon opposite walls of the casing 34 adjacent the top, as by hinge leaves 39 fixed to the sides of the casing. Rods 40 are extended through the knuckles of and constitute the hinge pintles for the hinge leaves 38, 39, the knuckles of hinge leaves 39 being loose on said rods and the hinge leaves 39 connected .to the shutters fixed to the rods. One end of said pintle rods is extend ed through the casing wall, and levers 41 of resilient material are fixed on said extended ends of the rods. The opposite edge portions of said shutters have a semi-circular cut out 42 to form an opening in line with the end of the section of .conduit 27 extended into the box 34. The shutters'are adapted to be moved to the position shown in Figure 3 to shut off the conduit 27 from the fan, or to variably position the shutter away. from the (3011-: duit 2'7, by the levers 41, and the shutters are retained in adjusted position by engaging either one of a series of pins42' in a perforation 43 in said levers, the pins being fixed in and extendedlaterally from sectors 44 fixed'to the outer side of the box 34. To facilitate the movement of the shutters away from the conduit 27 they are provided with weights 45, and to seal the shutters in closed position against the conduit semi-circular bands 46 of yielding material, such as felt, are secured to the shutters to be interposed between the end of the conduit 27 and the shutters when in closed position. The shutters are locked in closed position by abutments in the form of screws 47 threaded into brackets '48 fixed to the outside of the box to have longitudinal movement in a direction diagonally to the pivot support of the shutters, each screw having a crank 49 at the outer end to rotate the same. 1

As hereinbefore stated at times the streams in their passage through

conduits

22, 23 to the burner passages are deflected so that the streams issuing from one end of the burner orifices and the fire flame are directed to one side of. the furnace. To obviate this and cause the fuel streams to issue from the burner orifice or orifices for the full area thereof means are provided to deflect and direct the streams in theirpassage through i the

conduits

22, 23 tov different portions of the burner passages. To deflect the stream in the conduit 23 an opening is arranged in the outerwall of the bend in the elbow 24 inline with a boss extended laterally therefrom,-as shown at 50. A plug 51 is engaged in said opening to have rotative movementabout its axis, the inner end of said plug being arranged to conform to the, contour of the inner surface of the elbow, thereby forming the inner end of-the plug substantially. of spoon-shape, as shown at 54. The insertion of the plug into the elbow is limited by a flange 51' V or the plug abutting against the boss 50. To rotatably adjust the plug and secure it in adjusted position screws 52 are engaged in arcuate openings 53 in the plug flange. Should it be desired to adjust the plug the screws 52 are loosened and the plug rotated to the right or leftas de-' sired, when it is again secured by the screws '52.

.It will be obvious that as the plug is adjusted the spoonlike end of the plug will be movedout of alinement withthe wall of the elbow and serve as a defiecting surface for the stream to strike against and therebycause the stream to be directed to one side or the other in accordance with by va flange 58 on said plug abutting against the flange of plug 51, and is secured in adjusted posi-' tion by'screws passed through arcuate openings in the flange thereof and threaded into openings 60 in the flange 51' of plug 51. By adjusting the plug 55 to the right or left the stream ,through conduit 22 will be deflected to one side or the other of the burner passage 14.

The openings in elbow 244 and conduit 22 for the engagement of the

plugs

51 and 55 are soarranged that when the plugs are removed implements may be inserted into said openings and manipulated to clear obstructions fromthe burner passages without the necessity of dismantling the burner mounting means. 1

It may be desirable to direct the fuel or fired flame issuing from the burner orifice into different portions of the furnace. For this purpose the openings 62 in the .burner flange 16 for the engagement of the securing'bolts 34" are arranged as slots, whereby the burner is adapted to have adjustment'about its axis.

Instead of the arrangement ofthe plugs 51 and 55 in the connecting elbow 24 of the burner, said elbow may be provided with a pair of openings arranged in parallel relation at opposite sides of the axis of the elbow and have removable closures for said openings, as shown at 63 in Figure 13, these openings being for the purpose of the passage of an implement for clearing obstructions from the burner passages.

To effect further adjustment'of theburner to of different thickness.

ward direction from the horizontal, or toward either side, an adjustable mounting is provided for the burner. For this purpose an annulus or ring 64 of wedge shape is provided; that is, the ring has greater thickness at one portion, as at 65, than at a diametrically opposite portion, as at 66, with the wall or walls tapering from the portion of greater thickness to the portion of less thickness. This ring is interposed between the burner and the burner mounting member 19 to have rotative adjustment about the axis of the burner. To direct the fuel stream downward into the furnace this annulus is adjusted as shown in Figure 14 with the portion of greater thickness at the top, and to direct'the flame upward the annulus is adjusted as shown in Figure 15 with the portion of less thickness at the top. To direct the stream at variable inclinations to'the left or right of a plane extending vertically through the burner and intermediate the positions of adjustment shown in Figures 14 and 15 the annulus is rotatably adjustable, without dismounting the burner, by loosening the burner securing means 34' which means also serves to retain the annulus in position. This rotative adjustment is permissible due to the arrangement of slots 67 in the annulus for the passage of the securing means 34". However, to adjust the burner to the position shown in Figure 15 from that shown in Figure 14, and vice versa, the burner must be removed to permit of the adjustment of the annulus through one hundred and eighty degrees. It will be obvious that this adjustment of the burner may be varied by the provision of rings In the structure of the annulus shown in Figure 16 it is provided with a series of six slots 67, whereas in the Figure 18 structure only three slots are provided.

As shown in Figure 9 the outlet orifices 14, 15 of the burner are extended laterally with the end walls of the burner passages diverging from the inlets to said passages to the outlet orifices thereof. By this arrangementthe fuel stream issuing from the burner orifices and the fire flame will be flaring or fan shape. While this may be desirable in some instances where the firebox of the furnace is of considerable width and a single burner is used, where the firebox is relatively narrow this flaring or spreading of the fire flame will cause the impingement of the flame against the sides of the firebox, usually constructed of brick, with the result that the same is burnt out in a short time and requires renewing. To obviate this and cause the fire flame to be directed in a path substantially in a plane parallel with the axis of the burner and side walls of the firebox of the furnace the inner surface of the lateral portions of the'burner passages at and within the burner orifices are arranged in a plane parallel with the axis of the burner, as shown at 68, said portions merging with portions of the wall inclining from the burner inlet. This may be accomplished by increasing the thickness of the Wall in the region of the outlet orifices and arranged at both lateral edges of the burner orifices when a single burner is used as shown in Figures 19 and 21, or it may comprise a separate piece secured in a suitable manner in the burner passage at the outlet orifice, as shown at 69, in Figure 20. By this latter arrangement when two burners are utilized side by side in an opening to thefirebox of the furnace only the lateral wall of the burner in the region of the burner orifices adjacent the wall of the furnace is provided with such directing means, as clearly shown in Figure 20. V l l It will be obvious that various modifications may be made in construction, organization and arrangement of the parts without departing from the scope of the invention, and that portions of the invention may be used without others and come within the scope ofv the invention.

Having thus described my invention I claim:

1. In the burning of pulverized 'ooal held in suspension in an air stream, a burner arranged with spaced walls one co-axially of the other toprovide a pair of passages through the burner with the inlets to the passages at one end of the burner and the outlet orifices at the opposite end thereof, means for connection to and mounting of the burner at the inlet end of the outer wall, a fuel transporting conduit connected with said means, a second fuel transporting conduit co-axially of the connection and the mounting means of the first conduit and having a slipjoint connection from the conduits to different parts of the burner orifices.

2. The burning of pulverized coal as claimed in claim 1, wherein the means for deflecting the fuel streams to different parts of the burner orifices comprises a tubular plug member rotatably mounted in the wall-of the mounting means for the burner, and a plug rotatably carried in the bore of the first plug and extend into and closing an opening in the conduit which is connected with the inner conduit Wall, said plugs having the inner ends arranged as a deflecting surface. 1 I

3. In the burning of pulverized coal held in suspension in an air stream, a burner arranged with spaced walls one co-axial of the other to provide a pair of passages through the burner with the inlets to the passages at one end of the burner and the outlet orifices at the opposite end thereof, a tubular member for connection with the outer burner wall, a fuel transporting conduit connected with said tubular member; a conduit eX- tended through said tubular mounting member and connected with the inner burner wall, said mounting member and inner conduit having alined openings for the inserting of an implement for clearing obstructions from theburner pas-- sages, and closure meansreleasably engaged in said opening in the tubular member to close the same and the opening in the conduit connected with the inner burner wall.

4. The burning of pulverized coal as claimed in claim 3, wherein the closure means for the opening in the tubular'conneoting member and inner conduit is adjustable and arranged to de fiect the fuel streams to different parts of the burner passages. e

5. In means for burning pulverized coal held in suspension in an air stream, a burner embodying a pair of co-axial walls to arrange the burner with a pair of passages therethrough one within the other, a conduit connected to each burner passage, one of said conduits being arranged within the other, means for delivering pulverized coal laden air to said conduits, and means for shutting off one of said conduits from said delivery means while maintaining'the other conduit open thereto.

6. Means for burning pulverized coal as claimed in claim 5, wherein the means to shut off one con-- duit from the means for delivering the pulverized coal laden air stream to the conduits comprises a pair of shutters pivotally supported at the connection of the conduits with said means and arranged at diametrically opposite sidesv of the outer conduit to have movement toward and away from the end of said outer conduit.

7. In means for burningfuel as claimed in claim 5, adjustable means for directing the streams from the conduits to different parts of the burner passages.

8. In means for burning pulverized coal as claimed in claim 5, means adjustably and removably .mounted in openings in the Walls of the conduits for directing the streams from the conduits to different parts of the burner passages, the openings in which said directing means is mounted being adapted for the insertion of an implement for clearing the burner. passages of obstructions.

9. The combination with a burner for pulverized coal held in suspension in an air stream, of means for mounting the burner casing and to connect the same with pulverized coal supply and feeding means having the passage constituting a continuation of the burner passage, and deflector means in the wall of said mounting means to constitute a wall portion of the passage therein and adapted to have adjustment on an axis transverse to the direction of flow of the fuel stream and the inner end arranged to extend in the plane of they passage Wall in one adjusted position and to extend at variable inclinations to said Wall to direct the fuel stream to different portions of the passage through the burner.

10. The combination witha burner for pulverized coal held in suspension in an air stream, of an elbow arranged for connection with the burner and constituting a continuation of the passage in the burner, said elbow having an opening through the wall thereof extending in a plane substantially. with the passage through the burner casing and transverse to the passage through the elbow, a plug, eans to rotatably mountthe plug in and close said opening, the inner end of the plug being arranged to conform to the inner surface of the elbow in the normal position thereof, and said plug being adjustable rotatable about its axis in the opening whereby to change the position of the inner end and the latter serve as a deflector to direct the flow of the fuel stream to different portions of the burner passage.

11. In a burner for fuel consisting of pulverized coal in suspension in an air stream, a casing arranged with passages therethrough one co-axially within the other,'the inlets'to said passages being at one end and the outlet orifices at the opposite end of the casing, a fuel supply and feeding means, means for connecting the burner passages with said fuel supply and feeding means, and means for shutting off one of the burner passages from the fuel supply while maintaining the other burner passage open thereto.

12. In a burner for fuel consisting of pulverized coal in suspension in an air stream, a casing arranged with passages therethrough one ooaxially within the other, the inlets to said passages being at one end and the outlet orifices at the opposite end of the casing,conduits one arranged within the other connected to the outer and inner burner walls in communication with the burner passages, pneumatic means connected with the conduits for delivering a pulverized coal laden air stream thereto, means to open the pneumatic means to and shut off the pneumatic means from the conduit to one burner passage, and manually operative means to retain said means in different positions.

JOSEPH E. KENNEDY.