US1828700A - Apparatus for removing incombustibles from stokers - Google Patents

Description

Oct. 20, 1931. H. c. CARTER 1,828,700

APPARATUS FOR REMOVING INCOMBUSTIBLES FROM STOKERS Filed Jan. 4, 1950 2 Sheets-shea 1 Oct. 20-, 1931. c, CARTER 1,828,700

APPARATUS FOR REMOVING INCOMBUSTIBLES FROM STOKERS Filed Jan. 4, 1950 2 Sheets-Shee 2 T'T'UEA/E Patented Oct., 20, 1 931 UNITED STATES PATENT OFFICE" HASKELL C. CARTER, OF PORTLAND, OREGON, ASSIGNOR TOIRON FIREMAN MANOFAC- TUBING COMPANY, OF PORTLAND, OREGON APPARATUS roia REMOVING INGOMBUSTTBLES FROM STOKERS Application filed Ianuary.4, 1930'. Serial No. 418,474.

This invention relates generally to underfeed stokers, and particularly to means for removing 'unburned'materials from the retort.

1 The main object of this invention is to provide a clinker remover which will scrape the clinkers from the fire bed before they have become fused, and to then'crush and remove these clinkers from the fire bed.

jg The second object is to carry the crushed out requlring lubrication, and at the same I time will be so arranged as to permit its introduction into the relatively small door opening of a furnace. 2,5 These, and other objects, will become more apparent .illustrated in the accompanying drawings, in which: Figure 1 is a vertical section through the '0 device.

Figure 2 is a fragmentary elevation of the drive gears with the casing broken away to disclose same.

Figure 3 is a section taken along the line 3-3 in Figure 1.

Figure 4 is a vertical section taken along the line 44 in Fig. 21 Similar numbers of reference refer to similar parts throughout the several views.

Referring in detail to.the drawings, there is illustrated the fuel feed duct of 'an underfeed stoker on whose retort end is mounted the circular tuyere 11 provided with the usual air outlet openings 12 and 13. Surrounding the discharge end of the duct- 10. and also supporting the tuyere 11, is an air box wall 14. Within the duct 10 ismounted a fuel feed screw-'15 whose shaft 16 projects through the end of the duct 10 and its square end 17 recesses in the shaft 18 Y and is driven thereby.

from the specification following as of a drive pinion 19. The shaft 18 journals in the bearing 20 of the gear case 21, which.

also carries a stud 22 upon which is mounted the gear 23 which meshes with the pinion 19 A cover plate 24 is placed over the pinion 19 and the gear 23.

Disposed around the outer sides of the .tuyere 11 are the grooved rollers 25 which are supported by means of the brackets 26 which, in this instance, are bolted to the sides of the tuyere 11. Supported in the grooves of rollers 25 is a ring gear 27 which meshes with the gear 23 and is driven thereby.

Mounted on the tuyere 11 is an outwardly flaring inner crusher element 28 which is stationary and is illustrated as being bolted to the tuyere 11. The outer side 29.0f the crusher element 28 is provided with the grinding ribs 30, which' are inclined for reasons which will beexplained later. The upper rim 31 of the crusher element 28 is provided with notches 32 which materially assist in the process of breaking up the over-hanging pieces of clink ers and starting them on their path through the crusher.

Surrounding the tuyere 11, just below the stationary crusher 28, is a horizontal stationary ring 33 which has formed therein an opening 34 through which ground clinkers can find their way into the delivery chute 35 into an ash collector box 36, orinto any other suitable discharge mechanism that may be provided. The final disposition of the clinker and ashes is of secondary importance to the v actual removal of same from the retort and the maintaining of same in a condition in which they would be easily removable. It is preferable to provide the ring 33 with an upturned flange 37 at its outer edge.

Secured to the ring gear 27 by means of the bolts 38 is a rotary crusher element 39 v whose inner-side 40 is provided with a plurality of grinding ribs 41 whose lower ends converge toward the ribs 30. The ribs 41 slope in a direction opposite to that of the 5 ribs 30 and in the rotary element 39 the advancing end of the ribs 41 is uppermost, causing a forced feed to assist gravity in passing. clinkers between the grinding ribs 41 and 30. On the rotary crusher element 39 0 the furnace base 46. Attached to the inner have passed off and the incombustibles are wall 44 just above the rotary crusher element 39 is a guard ring 47 which serves to prevent the clinkers from passing down the outside of the crusher element 39.

In the operation of the device coal 48 is fed upwardly through the retort-by means of the screw 15 passing through the various stages of combustion on its journey until it reaches the rim 31, by which time the combustibles either in the form of a clinker or ash, depending upon the kind of coal burned, the

rate of combustion and the intensity of the heat developed. If the incombustibles pass over the rim 31 in the form of finely divided particles there is of course no difliculty encountered in the removal of same, but 1f, as is commonly the case with this type of a stoker, a clinker 43 is formed it is broken away from the main body of the fuel by means of the breaker bar 42, the over-hangmg portions falling between the grinding IlbS 30 and 41 where they "are still further 'reduced in size until the maximum in size will readily pass through the opening 34.

Itwill be seen from the above that the clinlger is not permitted to congeal and solidify to a point where the crushing operation would become at all difficult, but it is removed and broke up while still in a relatively fragile form. v

It will also be understood tha ash, removers have been constructed in the past in which it was assumed that all of the incombustibles would pass ofl' without forming a clinker.

.Should this assumption be correct these devices would work satisfactorily, but it is to overcome the condition of clinkering which is common in this class of devices that the above described apparatus has been constructed.

It will be noted that the ribs 30 on the stationary member, although indicated as being sloping'in a direction opposite to the ribs 41 on. the revolving member, may in some instimces be upright, or at some intermediate ang e.

It is important that the adjacent faces of the stationary and rotary members 28 and 39 converge downwardly approximately in the manner illustrated for the purpose of securing the desired crushing action.

I claim:

1. In a stokerthe combination of a retort throughwhich coal can be fed upwardly, a

ary grinding element, said grinding elements having grinding ribs on their adjacent faces between which the. overflow from said retort must pass, and means for rotating said rotatable grinding element.

and having grinding ribs on the outer side thereof, a rotatable grinding element surrounding said retort outlet and spaced therefrom, a clinker breaking bar secured to said rotatable element and projecting; upwardly between same and said retort outlet, and means for rotating said rotatable element in a manner to-cause said breaking bar to separate projecting clinkers from the fuel bedto cause same to be crushed between the inner side of said rotatable element and the outer side of said retort outlet.

.3. In'a stoker the combination of a stationary circular retort having grinding ribs formed on the outer side thereof, a rotatable grinding element surrounding the upper por-' tion of said retort having grinding ribs on the inner side thereof converging with the grinding ribs of said retort, said grinding ribs sloping in, a downwardly feeding direction, a floor plate under the space between said grinding elements having an opening therein through which ground clinkers can 4. An ash remover for underfeed stokers having in combination a retort having an outwardly flarmg circular rim having grinding ribs formed on the outer side of its uppermost portion, an outer grinding element spaced'from said retort rim and converging 'kdo'wn-wardly therewith at the adjacent faces thereof, said outer element having grinding.

ribs therein sloping in relation to the grinding ribs on said retort rim in a manner to cause a resulting downward movement of materials, a movable breaking bar operating between and above said grinding elements, a guard around the top of said outer grinding element adapted to prevent materials from passing down on the outside thereof, means for rotatably mounting said outer grinding element and for driving same in a direction in which the advancing edges of its ribs will be uppermost, and means for collecting and disposing of the ground clinkers passing between said grinding elements.

HASKELL C. CARTER.

' stationary circular grinding element forming an outlet for said retort, a rotatable grinding element mounted outside of said station-

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