Патент USA US2122807код для вставки
July 5, 1938. 2,122,807 H. c. CARTER anummous ASH REMOVER FOR UNDERFEED STOKERS Filed June 18, 1935 2 Sheets-Sheet 1 FF ' "fax 75 74 ‘5 41 4 543 5,9 37 4/ "a 615 my“wk\XM H.C. . CARTER E >/ ? TTURNEV 2,122,807 Patented July 5, ‘1938 UNITED STATES PATENT OFFICE 2,122,807 BITUMINOUS ASH REMOVER FOR UNDER ‘FEED STOKERS \\ Haskell C. Carter, Portland, 0reg., assignor to Iron Fireman Manufacturing Company, Port ‘land, Oreg. Application June 18, 1935, Serial No. 27,195 7 Claims. (01. 110-.-45) This invention relates generally to underfeed stokers, and particularly to bituminous ash re The main object of this invention is the con 5 struction of an ash remover for bituminous un derfeed stokers which will so affect the manner in which the coal is consumed that it will reduce the tendency to form clinkers, thereby simplify ing the problem of removing the incombustibles ~~ showing the ash removal worm exposed and the fuel feed duct broken away in section to dis 5 close the fuel feed worm and showing the outline of the furnace in dotted lines. ‘ Fig. 2 is a vertical section taken along the line 2-2 in Fig. l. Fig. 3 isa fragmentary vertical developed sec- 10 ' 10 from the combustion zone. - The second object is to provide an improved form of ash remover which incorporates a means for delivering air to a larger/ area of the bum ingsurface than is ordinarily possible and at the 15 same time make it possible to vary the rate of flow of said air to various portions of the fuel bed. The third object is to construct an ash re mover which makes possible the use of small discharge openings for the ashes at the same time eliminating shearing points between the ash ports and the ash removal arms with the consequent reduction of noise which accompanies clinkers crushing and also avoiding the difficulty of having clinkers wedged between the ash re 25 moval arms and the ash plate. I The fourth object is to so construct the ash remover that the coal will be burned over a rela tively large area at a temperature below the fus ing point of the incombustibles bringing about a 30 condition which is extremely favorable to- the mechanical removal of the ashes. The ?fth object is to construct a retort and tuyere assembly together with the surrounding ash rings with a relatively small inside tuyére di 35 ameter where the green coal enters the fuel bed for the purpose of breaking up any coke columns which might form and also to increase the active burning area for the coal. ‘ Fig. 1 is a side elevation of a complete stoker movers therefor. 20 illustrated in the accompanying drawings, in which: _ The sixth object is to provide a special form 40 of ash ring adapted to be selectively rotated to var ious positions 'for the purpose of varying the ratio of the air flow to the inner part of the retort with relation to the‘ flow to an outer portion of the retort and also to obtaina regulation'for the 45 pressure of the air ?owing toward the outer por tion 'of' the ‘retort. The seventh object is to construct the portion of the tuyére which is subjected to the most intense heat, aswell as the projecting arms, in the form of an integral casting of a high alloy heat resisting steel and to so mount same that it -may be easily replaced if necessary. I accomplish these and other objects in the 55 manner set forth in the‘ following speci?cation as tion taken along the line 3-3 in Fig. 2. Fig. 4 is a plan of the tuyere and ash remov ing section with portions broken away in horizon tal section. Fig. 5 is a vertical section taken along the line 15 5—5 in Fig. 4 showing the ring in its lowest ad justed position. Fig. 6 is a section taken along the line 6—-<6 in Fig. 5. Fig. 7 is a section taken along theline 1—-1 in 20 Fig. 2. Similar numbers of reference refer to similar parts throughout the several views. Referring in detail to the drawings, there is shown a hopper Hi from which coal is conveyed 25 through a coal tube ll by means of a coal feed ing worm l2 which is driven from a motor l3 through gearing contained within a transmission casing Id. The coal tube ll terminates in a re~ tort l5 which is surrounded by the plenum cham- 30 her walls‘ IS. A floor plate 11 forms the bottom _ of the plenum chamber l8, while the side walls l6 merge into the horizontal top I9 which extends into the retort l5. A circular plate 20 is mounted on the top It and secured thereto by means of bolts 2!. Open ings 22 are formed through the top l9 and the plate 20 for the upward passage of air from the plenum chamber Hi to which air is supplied through an air duct 23 by a fan (not shown). Rotatably mounted on the plate 20 is the outer tuyere wall 24, whose horizontal flange 25 rotates upon the plate 20 and extends beyond the‘souter edge of the plate 20. A toothed ring 26 is secured to the underside of the extending portion of the ?ange 25 and meshes with the inclined ash re moving worm 21 which occupies the ash remov ‘ing duct 28 and is driven from its upper end through a universal joint (not shown) by means of a sprocket wheel 29 which is connected by the chain 30 to the power takeoff sprocket wheel 3| on the side of the transmission casing H. The “upper side of the end 32 of the ash removing ‘duct “28 is cut away to expose theworm 21 to the toothed ring 26 and to the ashes which fall down- 35 40 45 50 55 2. ‘2,122,807 ' wardly around the .outside of the plenum cham~ ber l8. Projecting inwardly from the outer tuyere wall 24 are the spokes 33 which connect with the cir cular inner tuyére wall 34, whose lower end _35 extends downwardly into the opening 36 formed in the center of the plate 20. The interior of the wall 34 registers with the interior of the re tort l5. The end 35 preferably does not engage 10 the wall of the opening 36 or the top l9. The top side 31 of the tuyére wall 34 slopes down wardly from its outer and inner edges to an in termediate line 38. Supported on the top side 31 and on the top 15 of the outer tuyére wall 24 is the element 39, from the top face of which projects a plurality of radial arms 40, the underside of each of which has formed therein a channel 4| through which air can pass upwardly from the space 42 through 20 the opening 43 and be discharged downwardly from the arms 40. Within the wall 34 are formed the air outlets 45, the top side of which is formed by the element 39. The outer portion 46 of the element 39 rests upon the wall 24 in 25 whose upper edge are formed the notches 41 through which air can pass from the space 42 to the outer side of the wall 24 without passing . through the arms 49. The element 39 is held in position by means of 30 the hooks 48 which engage the lugs 49 formed on the inner side of the wall 24 when the ele ments 24,and 39 are rotated with relation to each other in one direction and are prevented from becoming disengaged byrotation in an op 3.5 posite direction by means of a headed pin 58 which extends downwardly through the element 39 on the opposite side of the next adjacent lug 49. . Secured to the outer side of the walls l6 are the upwardly extending brackets 5| whose upper ends 52 occupy the recesses 53- in the outer rim 54 from which extend inwardly the radial arms 55, whose upper edges 56 are spaced below the under edges 51 of the arms 40. ~Resting upon the upper edges 56 of the arms 55 is an annular outer ash ring 58, whose outermost edge 59 is spaced from the innermost surface 68 of the outer rim 54. The edges 59 and 6| of the outer ash ring 58 are preferably undercut, as shown. On the underside of the outer ash ring 58 are formed the notches 62 which engage the arms 55 and serve to prevent the rotation of the ring 58 as well as to hold same concentric with relation to the outer portion 46 of the element 55 39. Between the inner edge 6| of the ash ring to the ?oor line forming an ash well 12 into which the ash duct end 32 extends. The operation of the device is as follows: Assume that the stoker is being operated and that coal is being fed through the fuel feed duct H by the worm l2 into the retort I5 from whence it passes upwardly within the walls 34 of the tuyere element. As the fuel passes the outlets 45 and receives air therefrom in the presence of the heat being generated about same, combus tion begins fairly close to the center of the retort and as the burning coals are moved out wardly by the upwardly fed stream of green coal, the partially burned coal passes over the 15 element 39 across the intervening space 13 be tween the elements 39 and 63 which is negligi bleand across the space 14, which is variable depending upon the position in which the ele ment 63 is placed upon the arms 55, after which 20 the almost completely burned fuel moves out; wardly to the space 15 between the outer ash ring 58 and the rim 54. It will be borne in mind that while this is taking place, the element 39 with its supporting 25 wall 34 and radiating arms 40 are all rotating due‘ to the action‘ of the worm 21 upon the wheel 26, and that during this rotation, air is passing to the arms 40 cooling and protecting same and at the same time affording additional combus 30 tion air to material resting on the ash rings 58 and 63. Obviously, the proportion of air being delivered through the outlets 45 in relation to the amount and pressure of air delivered through the spaces 14 and 15 will vary according to the 35 position of the inner adjustable ash ring 63. In‘ other words, air is supplied to the burning fuel close to the center of the combustion zone and is delivered in annular rings of increasing diameter toward the outer edge of the combus 40 tion zone, and the amount and pressure of the air thus delivered may be easily adjusted to suit the operating conditions. “ It will also be noted that by providing this > large burning area, it is less necessary to force the ?re and it is therefore possible to )avoid tem-' 45 peratures which would otherwise fuse the in combustibles and thereby produce clinkers which must either be broken up mechanically or re moved manually. By the construction above de 50 scribed, clinkers are not formed and the result ing ash possible through the aid is of a very fragile nature making it for it to easily escape downwardly the spaces 14 and 15 by gravity or with of the air blown through the arms 48 58 and theouter pqrtion 46 of the element 39 or by an agitation set up through the move- . and also resting upon the arms 55 is an inner ment of the arms themselves. I claim: 1. An underfeed stoker having in combination adjustable ash ring 63, whose innermost edge 64 is parallel with the outer surface of the por tion 46 and'is vertically slidable with relation ‘so thereto. The underside of the ring 63 is provided with a series of notches 65, 66, 61, 68 and 69 of in creasing depth making it possible to secure var 65 ious adjustments for the elevation of the inner a revolvable tuyére section comprising spaced 60 circular inner and outer walls, a retort includ ing means for discharging fuel upwardly through the retort into the tuyere section, means for ad mitting air to the space between the tuyére walls, the outer tuyere wall having air discharge open 65 ring 63, whose outermost edge 10 is undercut. ings therein, said revolvable tuyére section hav The ring- 63 may be adjusted vertically by ro ing radial arms projecting horizontally from the top edgethereof, each of said arms having an air passage communicating with the interior of the tuyére section and having a discharge open 70 tating same circumferentially until one of the desired notches 65 to 69 engages its respective arm 55. It will be noted that the inner edge 64 of the ring 63 extends downwardly sufficiently far when the ring 63 is in its lowermost posi 15 refractory material ‘II which extends downwardly tion to coverthe ports formed by the notches 41 and the tuyére wall 24. vIt is desirable to surround the rim 54 with a ing on the under side thereof, a stationary ash ring concentrically spaced from said tuyere sec tion, a vertically adjustable ash ring disposed within the space between the tuyere section and the stationary ash ring, said vertically adjust 3 2,122,807 able ash ring constituting a means for control ling the flow of air through the outermost tuyere openings and through the annular space between said ash rings. -} 2. An underfeed stoker having in combination a revolvabletuyere section having a toothed ring attached thereto, an ash removing worm mesh ing with said toothed ring, means for driving said worm, the upper portion of said tuyere sec 10 tion having a cylindrical exterior provided with air outlets, a vertically adjustable ash ring dis posed around said cylindrical tuyére portion adapted in control the flow of air through said outlets, r. stationary ash ring disposed outside of 15 said vertically adjustable ash ring, the adjacent edges of said ash rings being beveled in a manner to vary the clearance between same when said ‘adjustable ring is moved vertically and a retort disposed under said tuyere section having means 20 for discharging coal upwardly therethrough. 3. An underfeed stoker having in combination a revolvable tuyére section comprising concentric spaced inner and outer walls, said tuyere section having a toothed ring attached thereto, an ash removing worm meshing with said toothed ring, means for driving said worm, the upper portion of said tuyére portion having a cylindrical ex terior provided with air outlets, a vertically ad justable ash ring disposed around said cylindrical 30 tuyere portion adapted to control the flow of air through said outlets, a stationary ash ring dis posed outside of saidv vertically adjustable ash ring, the adjacent edges of said ash rings being 4 provided with channels communicating with the interior of the tuyere section and discharging downwardly upon said ash rings. 5. A stoker having a retort and means for feed ing fuel upwardly therethrough, a revolvable cir cular tuyere section comprising concentrically spaced inner and outer walls disposed immediately above the level of the discharge opening of said retort, the outer side of said tuyere section being cylindrical and perforated, an annular adjustable 10 ash ring disposed around the cylindrical portion of said tuyére section constituting a means for varying the ?ow of air through its perforations, a stationary ash ring disposed around the adjust able ash ring and spaced therefrom, a rim sup 15 porting said stationary ash ring and projecting upwardly therefrom, a toothed ring attached to said tuyere section and an inclined ash removing worm meshing with said toothed ring. 6. A stoker having in combination a tuyere sec 20 tion comprising spaced circular inner and outer walls, the inner walls constituting the upper por tion of aretort andthe space between the inner and outer walls constituting an air supply cham her, said outer ‘wall having air outlets therein, 25 an adjustable ash ring disposed around said outer wall adapted to be adjusted vertically for the purpose of controlling the flow of air through said outlets and means for rotating said inner and outer walls. 30 7. An underfeed stoker having in combination a circular revolvable tuyere section having spaced inner and outer walls, said tuyére section having beveled in a manner to vary the clearance be an open underside for the admission of air to the tween said ash rings when said adjustable ring is moved vertically and a retort discharging up wardly into said tuyére section. 4. An underfeed stoker having in combination a revolvable tuyere section comprising spaced cir cular inner and outer walls, said tuyere section having a toothed ring attached thereto, an ash removing ring meshing with said toothed ring, means for driving said worm, the upper portion of said tuyere section having a cylindrical exterior provided with air outlets, a vertically adjustable ash ring disposed around said cylindrical tuyere portion adapted to control the flow of air through said outlets, a stationary ash ring disposed outside of said vertical adjustable ash ring, the adjacent edges of said ash rings being beveled and a plu space between said walls, said tuyere section hav ing air discharge openings in its inner and outer walls, said tuyere section having radial arms pro jecting horizontally outward from the top edge rality of radial arms projecting outwardly from the inner upper edge oi.‘ said tuyere section and thereof, each of said arms having an air passage communicating with the interior of the tuyere section and having a discharge opening on the underside thereof, a retort discharging upwardly into said tuyere section, means for feeding fuel upwardly through the retort, a stationary ash ring concentrically spaced from said tuyere section and a vertically adjustable ash ring disposed within the space between said tuyere section and' stationary ash ring, said vertically adjustable ash ring constituting a' means for controlling the ?ow or air through, the outermost tuyere openings and through the annular space between said ash rings. ‘ HASKELL C. CARTER.