US1106444A - Fuel-feeding apparatus. - Google Patents

Description

T. 'A. EDISON.

FUEL FEEDING APPARATUS. APPLICATION 211.111) NOV. 39, 1907.

Patented Aug. 11, 1914,

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T. A. EDISON. FUEL FEEDING APPARATUS. APPLICATION FILED NOV. 29. 1907.

1,106,444. Patented Aug. 11,1914;

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, resident of Llewellyn Park, Orange, county V 5, of Essex, and State of NewJersey, have inr no L cense,

I Specification of Letters latent. Application filed November 29, 1307. Serial No. 404,215.

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Patented dugrilil, 191%.

T6 whorl; it may-concern: Be it known that I, THOMAS ALVA EDI- son, a citizen of the United States, and a vented certain new and useful Improvements in Fuel-Feeding; Apparatus, of which the following is a description.

vlily invention relates to animproved ap paratus for feeding fine orpulverized fuel,

and the invention has been especially .de

signed, and. has been successfully used, for

feeding pulverized coal into rotary. cement IIS.

object is to produce anapparatus by means iof-which fine or pulverized fuel may be fed ina compact stream within a rotary kiln or other heating chamber in an efiective manner and at leiw cost. At the present time in the-operation of rotary cement kilns,

it is the generalpractice to force'the pulverized coal into the kiln with ablast ofair amounting'only to-a small proportion of thatnecessary for complete combustion, the balance of the air being drawn into the kiln by the inductive effect of the blast and by the draft created by the stack; and with the best practice the largebulk of combustion air which is thus drawn into the kiln surrounds the central core of pulverized fuel as an inclosing envelop. This practice of feeding pulverized fuel to a cement kiln is objectionably expensive. For example, in the operation of several standard 150 foot Edison kilns, e'ach equipped with two blast nozzles, I found that air compressors ofsubstantially horsepower for each kiln were I necessary toeifect the proper feed, whereas,

The projecting device in its preferred form comprises a suitable casing in which is r0- tatably mounted, a series of radial arms, carrying wingsfwhich engage the fuel particlesl and project them centrifugally into a kiln,

such arms beingrotated within the casing at an enormous surface. veloc1ty.

Inorderthat the invention may be better 1 understood attention is directedto the accompanying drawings, forming part of this specificationfand in which- T Fig re, Irepresents a front :elevation, partly in section, showing a rotary. kiln and the cooler, andillustrating the use of two projecting devices for feeding fuel to the kiln; Fig. 2, alongitudinal.sectional view of the same showing means for driving the feeding devices at different speeds; and Fig. Elan enlarged cross-sectional view of one of the feeding devices. v

' .In all of these views, corresponding parts are rep-resented by the same numerals of reference. 1 I

I -The rotary kilnl, thestationary chamber 2, into which it leads,.and the cooler 3 for receiving the clinkered material from the kiln, are all, of. well-known construction. Suitable means (not shown) are. employed for feeding unburned cement material to the upper end of thekiln. At the front of the kiln is the usual platform 4 on which the operator may stand for observing the operition of the kiln. Mounted upon this platiorm is a suitablerstandard 5,.carrying the two projecting devices 6, from each of which leads a nozzle 7. These nozzles, as will be ebvious,,are arranged on either. side of the llongitudinal axis of'the kiln. Each projectitng device comprises a suitable two part casing (see Fig. 3) bolted together, one section being formed with an entrance passage 8 through which'the fuelenters the casing,

Extending around the interior of the casing is a removable ring 9, having an opening,

passage to-the nozzle 7, as will'be understood, and made of chilled iron or other very hard material. Practically all of the wear within the casing will be confined to this removable ring, which can be taken out and replaced when worn. Mounted in each casing is a shaft 10, carried in suitable bearings'11-1l, outside of the casing and driven by a pulley 12 from any suitable source of power. The shaft 10 carries a spider 13 diameter of the plates is twenty-four inches and rotate the shaft at from 2500 to 3000 revolutions per minute, giving a surface. velocity to the particles of upward of 15,000 'feet per minute. With a feeding device ofthis size and operated at'this speed, I find it possible to feed as much coal in as effective a manner as can be done under present conditions with an expenditure of horsepower for operating an air compressor. The pulverized fuel is supplied to each feeding device by any suitable mechanism; I illustrate a bin 15, containin thefinely pulveramount of fuel supplied to each feeding ized fuel, and connecte atits lower end with one or more screw conveyers 16, for delivering the fuel to a pipe 17 connected with the assage 8. Any suitable mechanism can. e employed for-regulating tihe evice, for instance, the shaft of each 0 the conveyers 16 may be rovided with a fric tion wheel 18, with w ich a friction wheel 19 engages, mounted on a shaft 20. By varyin the position of each friction wheel 19 wit reference to the center 'of the 00- operating friction wheel 18, .the speedof the conveyer will be regulated and the supply of fuel in this way-may be controlled, as will be obvious. wheels 19 with respect to the wheels 18 may be regulated by any convenient means, as for example, by means of the shifting lever 22 pivoted at 23 and carrying a pin 24 at its lower end, engaging between shoulders 25 and 26 on the shaft 20. The speed of rotation of each of the feeding devices may be the same, so that two streams 'ofpulverized fuel will be fed at the same velocity into a kiln (as shown in Fig. 1), butpreferably, the speed of one feedin device is hi her than that of the other, so that the com us tion zones as formed by the burning fuel, will overlap so as-to thereby form an extended area in which the clinkering operation takes place. A- construction for accomplishing this last result is shown in Fig. 2 in full and dotted lines, pulleys 12 of thesame size being directly connected to the shafts of the feedin devices and being driven by belts 27 an 28 respectively, passing over pulleys 29 and 30 of different sizesfixed todriving shaft 31. Ordinarily, I provide a small air vent 21 above-the p1pe'17, to prevent the suction of the fans or wings 14 from drawing the pulverized fuel past the conveyer-16, but the amount of air which thus enters the feeding device is negligible, and if desired The positions of thethe said air vent inay. 'be dispensed with- Consequently, with my present mventlon, practically all the air necessary to effect the combustion of the fuel is drawn into the kiln by the draft. While I prefer to'make use of a pair of nozzles leading into each kiln, such an arrangement being especially advanta geouswit very long kilns, and particularly when the com ustion zones overlap, as explained, it will be understood that a slngle nozzle may be employed and may be' advantageously used when the. kilns are relatively short.

Having-now described my invention, .what I claim as new and desire to secure by Letters Patent, is as follows:

1. In a device of he character described,

the combination with a closed casing, a series of rotating vanes mounted in the casing,

said casing having a peri heral discharge 2. In a de ice for feeding pulverized'fuel,

a closed casing having a peripheral discharge opening, a, rotary member mounted within said casing and closely fitting the interior thereof in the vicinity of said opening, means for rotating said rota member at a high speed, asupply bin, a c osed passageway between said bin and said casing, and aconveyer in said passageway, said passageway being provided with a minute vent between the conveyer and said casing, substantially as described.

3. In a device of the character described, the combination of a kiln, a supply bin, a closed casing having a nozzle arranged to project fuel into the kiln, a closed passageway connecting said bin and easing, a con.

veyer in said passageway for supplying fuel to said casing from said bin, said passa .way being provided with a minute vent s tween the conveyer and said casing, and means in said casing adapted to discharge the fuel wholly by impact through said nozzle andinto saidkiln, substantially as described. J

4. In a device of the character described, the combination of a kiln, mechanical means for projecting within and through one end of the kiln and solely by impact, a'continuous compact stream of pulverized fuel substantlally: free from admixed air, and a coolmg chamber communicating with the end 9f the kiln through which. the fuel is pro- Jected and supplying air to the kiln where- .by the stream of fuel will be supplied with described.

vfrom admixed air, and means for su plying the stream of fuel asit enters the ki n with a surrounding envelop ,of air necessary to support combustion thereof, substantially as 6. In a device for feeding pulverized fuel,

a closed casing having a discharge opening,

a closed passageway communicating witl'n15 said casing, means for supplying fuel to said casing through said passageway, and means within said casing for discharging fuel therefrom through said discharge opening,

said passageway being provided with a 20 minute vent, substantially as described.

This specification signed and witnessed this 25th day of November 1907.-

THOS. A; EDISGN.

Witnesses:

FRANK L. Drnn, ANNA R. Krnmm Copies of this patent may be obtained for five cents each, by addressing]; the Gomznissioner of Patents,

. Washington, D. E?

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