US1708505A - Pulverized-coal-feeding device - Google Patents

Description

April 9, 1929. JACKSON 1,708,505

PULVERIZED COAL FEEDING DEVICE Filed Sept. 1925 2 Sheets-Sheet 1 W awoemiioz v 33313 flbtm; I, 9 Z Z April 9, 1929.

G. P. JACKSON 1,708,505 PULVERIZED COAL FEEDING DEVICE Filed Sept. 5, 1925 2 Sheets-Sheet 2 (Inventor I 854, Qbtomuf Mf/ Patented Apr. 9, 1929."

UNITED STATES PATENT OFFICE.

GEORGE P. JACKSON, OF FLUSHING, NEW YORK, ASSIGNOR TO INTERNATIONAL COM- BUSTION-ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

IPULVERIZED-OOAL-FEEDING DEVICE.

Application filed September 3, 1925. Serial No. 54,176.

This invention relates to devices for feeding pulverized coal and 1s especially useful in connection with the feeding of coal to the furnace. Ordinarily all of these feeders are driven from a single shaft, suitable clutch mechanism being provided for each feeder. The feeders are cut in or cut out as'may be I needed to suit the requirements of firing.

v I propose to split the feeders into units, each unit being driven by a motor which gives me a range of flexibility not otherwise securable although, of course, more motors are required. However, the advantage of increased flexibility more than compensates for the initial increase in investment for the following reasons. Certain of the feeders are operated more than the others and consequently these feeders wear more rapidly, in addition to which the wear, as between individual feeders, may vary. Since uniformity of feed is highly desirable in pulverized fuel burning installations, I am enabled by dividing up the feeders into units to meet these practical conditions which arise in'service and secure-a uniformity of feed.

I further propose;- torso arrange the connections from the feeders to the burners that I am enabled toobtain balanced flame conditions at various rates of operation and also at timeswhen it may benecessary to shut down one or more of the motors for repairs.

How the foregoing, together with such other objects and advantages as may be incident to my invention, are realized, is illustrated in preferred form in the accompany ing drawings, in which Fig. lis a side elevation of my improved arrangement of feeding devices;

Fig; 2 is a similar view of a modification of my'invention, and

Fig. 8 is a sectional view illustratingcertain details'of the invention.

Referring now. to Fig. 1, the reference character 7 indicates the bin or bins beneath wlnch are two feeding units A and B, these units comprising a suitable casing 8, each 035111 belng provided with the feed screws 9, eac 1 of which is adapted to discharge into a pipe 10. In the present instance, each unit has four feed screws and each pipe 10 leads to a burner. Each unit is. driven by a motor 11, the screws 9 being provided with worm wheels 12 adapted to engage worms 13 on the shafts 14:. The shafts 14 may be coupled together by a clutch 15, whereby one motor may be utilized to drive both units.

The pipes 10 cross one another in the manner indicated in the figure so that each unit is adapted to feed every other burner of the row of burners C.

Normally each unit would be driven by its own motor and at low rates of firing one of the units would be cut out so that only half of the burners would be in operation. Inasmuch as when one of the units is cut out every alternate burner is cut out, it will beseen that a balanced flame condition must obtain in the furnace D. Thus at low ratings the balanced flame condition is obtained and a similar condition is obtained when it is necessary to shut down one of the units in order to make repairs in the feeder or feeders. If one of the motors should become defective, it can be repaired without disturbing the normal operation by simply coupling the two shafts 14 together.

Each feeder screw is controlled by a clutch 16 having an actuating lever 16 so that indi-' screws and each unit being driven by a motor 17, each feeder screw being controlled by a clutch 16 as above. The pipes 18 leading from each feeder screw cross in the manner indicated. By cutting out the two middle units four burners only will be in operation and these will be in the middle, and a balanced flame condition will result. Furthe furnace, at as high a rate as the remaining burners, in order to prevent scouring of the side walls. The independent control which is afforded by splitting up thefeeders into a large number of units'makes it possible to take care of thiscondition by slowing down the motors for the feeders supplyingthe end burners, relative to the other motors. As before, a widelrange-of flexibility, in so far as variations in the rate of firin are concerned, is obtained'by virtue of the act that a feeder of each unitmay be cut in or cut out as may be required for the particular rate at which the .installation is being fed.

What I claim is: 9

1. In combination, a source of pulverized fuel supply, a plurality of feeders arranged in groups, means for independently operating the feeders of each group, a row of burners, pipes from feeders of a group to nonadjacent burners in the row, and pipes from the other feeders to the remaining burners.

2. In combination, a source of pulverized fuel supply, a plurality of feeders arranged in groups, means for independently operating the feeders of each group, a row of burners, pipes from feeders of a group to nonadjacent burners in the row, and pipes from the other feeders to the remaining burners,

together with a clutch for each feeder.

3; In combination, a source of pulverized fuelsupply, a plurality of feeders arranged in groups, means for lndependently operating the feeders of each group, a row of burners, pipes from feeders of a grou to non adjacent burners in the row, and pipes from the other feeders to the remaining burners, together with a clutch for each feeder, and

means whereby all feeders may be driven from the same source.

4. In combination, a source of powdered fuel supply, a plurality of feeders arranged in groups and taking fuel from said source, independent means for operating the feeders of each group, a row of burners, and connecting means between each feederv and a burner, one or more burners fed by a feeder of one particular group being positioned between burners fed by. feeders not of that group.

5. In combination, a source of powdered fuel supply, a plurality of feeders arranged in groups and taking fuel from said source, independent means for'operating the feed ers of each group, arow of burners, and connecting means between each feeder and a burner, one or more burners fed by a feeder of one particular group being positioned hetween'burners fed'by feeders not of that group, together with means for causing the operating means of one group to operate more than one group. Y

6. Inc'ombination, a source of powdered fuelsupply, a plurality of feeders arranged in groups and taking fuel from said source, independent means for operating the feeders of each group, a row of burners, and connecting means between each feeder and a burner, one or more burners fed by a feeder of one particular group being positioned between burners fed' by' feeders not of that group, together with means for rendering individual feeders inoperative.

7. In combination, a source of powdered fuel supply, a plurality of feeders arranged in groups'and taking fuel from said'source, independent means for operating the feeders of each group, a row of burners, and connecting means between each feeder and a burner, one or more burners fed by a feeder of one particular group being positioned between burners fed by feeders not of that group, together with means for causing the operating means of one group to operate more than one group and means for rendering individual feeders inoperative.

' In testimony whereof, I have hereunto signed my name.

GEORGE P. JACKSON.

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