US1769763A - Pulverized-fuel-distributing apparatus - Google Patents

Description

W. R. WOOD July 1, 1930.

PULVERIZED FUEL DIST "RIBUTING APPARATUS Filed June 16. 1925 INVENTOR.

ATTORNEYS.-

Fate-rated July l, 1939 I STTES' WILFRED 3. W001), orvrounon, ENGLAND, assrenon To INTER-NATIONAL coMBus TION' ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF 7 DELAWARE PULVERIZE1)'-FUEL-DISTBIBUTIN G APPARATUS Application filed June 16, 1825. Serial No. 37.426.

This invention relates to the distribution of pulverized fuel and is especially useful for supplying such fuel to the burners of pulverized fuel furnacesyin instances Where a plurality of burners are employed in a single furnace or where a plurality of furnaces are to be supplied, each having one or more burners, or otherwise where there are a plurality ofdelivery points which are to be supplied from a single source.

In this art diliiculties are encountered whe a number of burners are to be supplied with pulverized fuel from a common source of supply, owing to the necessity for continuous feed and uniform distribution to each of the burners. .Heretofore it. has been necessary to provide individual feed devices for each burner which, together with the control mechanismstherefor, runs up the cost of installations to an almost prohibitive figure. I

Thru my invention I aim to distribute fuel amongst a plurality of conduits in'a simple manner and in such a way that continuous feed and uniform distribution are realized, hence obtaining more effective operation of the installation as a-whle.

How the. foregoing, together with such other objects and advantages as may hereinafter appear, or are incident to my invention,

are realized thru my invention is illustrated in preferred form in the accompanying drawings, wherein Fig. 1 is an elevation view showing a general arrangement of a pulverized fuel burning installationembodying my improvements;

Fig. 2 is a plan view of the structure illustrated in Fig. l with some of the parts broken away and the building structure omitted;

Fig. 3 is a diagrammatic elevation View illustrating my invention adapted for use in association with a battery of furnaces; and

Fig. 4 is plan section taken on the line 4-4 of Fig. 3.

Referring now to the drawings in Figs.

1 and 2,1 have illustrated my invention in association with a furnace shaped boiler such as shown in 'my co-pending application, Serial No. 3,921, filed January 22, 1925, in

1 which the fuel is admitted at each of the four corners of the boiler furnace A, there being provided a plurality of burners at each corner arranged one above the other and having the pipes or conduits 2 leading thereto from the lower portion of the cyclone distributer or chamberc3, which will be hereinafter more fully described.

The installation includes a storage bin or hopper (not shown) for the crushed coal supply, which coal is gravity fed thru a suitable conduit 5 to the pulverizer mill 6 for pulverization. The pulverized coal is led from the mill 6 to a vertical cyclone separator (not shown) where the air and coal are separated. From the separator the coal is delivered to a pulverized coal bunker 11 from which it is discharged by the feeder 12 into the fuel lines 13 for elevation to the cyclone distributor or mixer 3 as will now appear. The elevating apparatus includes a fan 14 having its discharge directed. past the discharge outlet of the feeder l2 and having a suction inlet pipe 16.

It is pointed out that a dividing member 23 is secured to the discharge outlet of the feeder 12 from which the fuel pipes 13 lead to the distributer 3, dampers 24 being provided therein for the purpose hereinafter appearing.

The Icyclone distributer or chamber 3 is constructed somewhat akin to'a cyclone separator such as'used in pulverized fuel systems, there being, however, an upstanding conical portion 25 in the bottom thereof spaced from the conical wall 26 so as to provide an annular bottom 27, adjacent which the conduits 2 are led off. The fuel on being tangentially delivered into the distributer 3 bythe airblast of the fan 14 whirls around and spirals toward the bottom thereof, due to the conical lower portion, so that the fuel is evenly distributed for delivery to the burners thru the mediumof the conduits 2.

This uniform distribution results from the fact that there is a peculiar uniform whirling condition set up in the bottom of the cyclone chamber. This in conjunction with the pressure secures uniform distribution with substantially uniform mixture in all of the outlets.

rating therefore, the fuel supply to the cyclone distributor must be such as will result in the maintenance of desired velocities,irrey'gspective ofthe varyin quantities of fuel wich maybe deliver-e over the operatlngj "tiall'y vertical axis and providingan upper both lines of which are used athigh rltthgmand only one of which. is used at low a cambebest seen in Fig. 2, the meiterfll which-is secured to the discharge outlet of the feeder 12' has provision for conmutiomtheretoof thetwo fuel lines 13. connection, if a single pipe of large 9M size to meet the demands at high ratp wereused, proper velocity condition in tliecyel'oue distributor would not be obtained atdonm ratings.

Refining nolwto Figs. 3 and 4, I have ilo mothis end I provide the double sup a lueirmted my invention adapted for use in con-- nmtiflniwit a battery of vertically fired; furnames (not shown),each provided witha plurality of'blumers. For 0 example, a battery chill-Ir furnaces, each havin four burners, u cflllld'rbeugu lied with fuel y meansof a didiihutor such as that'shown in Fig. 3. The

cmflrimtinn of the distributor 3 and the fuel lines 13' and dampers 24' being similar in all distributor shown in F' s. -1 an Wi with the exception thatthe con uits tq the burners lead out of the annular cf the distributor 3, instead flfifmithfi bottomof the conicalwall therecat, as in the other embodiment. In this instance, valves 28 are located in the conduits Qflimnrdar that one or more maybe cut out,

flalwited when operating at low ratings. seem l-flit: pulverized fuel handling or deliverbig pnratalsthe combination of a cyclone r, a. plurality of conduits equally awn about. and opening fromthe periphcry of the lower portion thereof and means fdrrtumgentially introducing powdered fuel 50 illtflthh chamber in suspension in a blast.

.zflahicyclone distributor for a pulverized fuel. com rising a casing forming a chamber, means. or tangentially introducing pawdmdfuelrinto the chamber in suspension 0 imqihllst chair. and a plurality of conduits leadingfmmwsaidchamber. into which con dmimwallwifhthe air with the fuel suspended therein is istributed.

"@3. cyclone distributor for a pulverized 05 fuel system comprising a casing forming a chamber, means for tangentially introducing powdered fuel into the upper portion of the chamber in suspension in a blast of air and a plurality of conduits leading fromthe lower portion of said chamber into which conduits all of the air with the fuel suspended therein isdistributed. a

4. I-napulverized fuel handling or delivering. a paratus the combination of a cyclone cham 'er, a plurality of conduits opening from the lower ortion thereof and means for tangentially introducing powdered fuel. into the chamber in suspension in a blast, the

said chamber being otherwise closed.

y distributor forpulverized .fuel comprising-a circular chamber havinga substan i tangentially into the uppersection and a plurilfi ty of deliverypipes leading fromsaid chumber with theends thereof arranged at substantiallythe same vertical height and substantially equally spaced about the peripheryof the lowerpart of the inverted frustoconical: section.

6. A distributor for pulveriaed fuel comprisinga circular chamber having a substantially vertical axis, means for introducing a mixed fuel and air stream tangentiallyin the upper portion of said chamber, and a pluxralitycf delivery pipes leading from openings intlwlowerportion of said chamber,the said opening being arranged in substantially m, thesaine horizontal plane and being substantia'lly equally spaced about the periphery of the lower part of said chamber. I

7. A distributor for pulverized fuel cormmixed fuel and air stream tangentially in the upper portion of said chamber, a plu-- .rality of delivery pipes leading from open ings in thelower portion of said chamber. the saidioponings being arranged in substantially the same horizontal plane and being equally spaced about the periphery of the lower part of-said chamber and an upright conical memberin the lower portionof said chamber with the edge of its base lying adjacent the delivery pipes; V a

8; (A distributor for pulverized fuel comprising a circular chamber, means for introducing a mixed fuel and air stream tangentiallydnto one end portion thereof, a plurality of delivery pipes leading from openings in the other end thereof, the said pipe openings being arranged in a plane at right angles to the axis of the chamber and being substantially equally spaced about the periphery of said chamber.

In testimony whereof, I have hereunto signed my name.

' WILFRED R. WOOD. 13o

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