US1802111A - Apparatus for burning pulverized coal - Google Patents

Description

G. P. HAYNES APPARATUS FOR BURNING PULVE'RIZED COAL April 2 1, 1931.

3 Sheets-Sheet 1 ATTORNEY Filed'Aug. 10. 1927 Aprilzl, 1931. I 5, p. HAYNES 1,802,111

APPARATUS FOR BURNING PULVERIZED COAL Filed Aug. 10, 1927 3 Sheets-Sheet 2 ATTORNEY April 21, 1931. G. P. HAYNES .8

APPARATUS FOR BURNING PULVERIZED COAL Filed Alig. 10, 1927 3 Sheets-Sheet '3 3. w 15% z; baa-A IN VENTOR Patented Apr. 21, 1931 1 UNITED STATES PATENT OFF f GEORGE r. HAYNES, 0F RR pKL R, NEW YORK, ASSIGNOR 'ro-ronn DRY DOCK ENGINEERING AND REPAIR CORPORATION, OF NEW YORK, N. A CORPORATION on NEW YORK f APPARATUS FOR BURNING PUL'VERIZED COAL Application filed August 10, 1927. Serial No. 211,340

-This invention relates to means for burning pulverized coal in furnaces, and-my improvements are directed to a new system wherein a furnace or each of a number thereof serving aScotch or Othertype of boiler isprovided with a complete unit for at tachment to a furnace front, each unitincluding a pulverizer, a fan and a prime mover that drives said pulverizer and fan; the-furnace front being. adapted to control the delivery of a supplyof heated. air for combustion, and the fan providing an air supply as a vehicle for conveying the powdered coal from the pulverizer to the Zone of combustion. Still furthereach unit is adapted for the removable placement of a burner wherewith fluid'fuel may be used to start the fire or to permit operation either on fluid fuel alone or with both fluid fuel and pulverized coal.

Also my invention comprehends the provision'of controlled means for the continuous delivery of comminuted coal into a hopper from which the coal passes by gravity into the pulverizers forming a part of re- 'spective units.

Other features andv advantages of my invention will hereinafter appearg In the drawings: H V

Figure 1 is a transverse sectional view of a steamship equipped with my improved "units and associated parts.

Fig. 3 is an enlarged elevation of a boiler and a single feeding unit ZL'PPlIQCT-thETQtO with thehopper shown in section, and

Fig. 4 is an enlarged sectiontaken on the line 4-4 ofjFig. 2. v

In the example of my invention herein illustrated I have indicated a steamship as equipped with a series ofboilers each provided with a number of furnaces all arranged athwart ship, each furnace having its own pulverizing and supply unit, all of which are served with comminuted coal froma common hopperwhich is continuously replenished by conveyer means.

Thus, in Fig.1 let lindicate the .hull of a steamship, 2 the boilers therein and 3 the furnaces for said. boilers. Extended across the front of the boilers, above the furnace fronts, is a hopper 1, and at Oppo: site sides thereof are endless conveyors 5,

' operating Over gears 6 and adapted to d e,

posit in'the hopper comminuted coal which has been dumped intOSthechute 7. It will be understood that the coal thus deposited in the hopper is to be distributed therein by suitable trimming means which may be either manual orinechanical.

Pendent'from the base of hopper l is a series of vertical tubes 8 each terminating in a flange 9, and each provided with a control means 10,'said tubes being adapted, when the control means are open, to deliver the comminuted coal by gravity from the hopper to respective pulverizers comprised in the furnace feed units. a In Fig. 2 there is shown in side sectional elevation a furnace front comprisingthe back plate 11 having an annular flange 12 adapted to fit withinfthe forward portion of the furnace, to which plate 11 is suitably attached, said plate havinga central opening'13 to coincide with the flared Opening 14- through the, brick which constitutes the fuel entrance into the furnace.

The plate 11 is part of the hollow furnace front, said furnace front having the partially surrounding wall 1'5,inturned flange 16, and inner coeaxia'l walll7, spaced from wall 15, to constitute the heated air supply space: 18 usual ,with this .type i of, furnace front. Also theinner wall 17 is pr ovided with ports 19 for the passage of heated air to the furnace interiorpto support combustion, and an annular ring'Q O, having ports 21 therein is revolubly mounted upon wall 17 to control the air supply. Operating means for ring 20 are shown at 20a, Fig. 4.

The elements of the furnace front thus far j described are substantially according to usual practice and in themselves form no" The in-i part of my present improvement. turned flange 16, aifords a base or mount for a plate 22, which is secured thereto by bolts 2221, and provides a complete front closure means for the heated air space 18. Said plate 22, has an outwardly extending annular flange 23 that projects a certain distance from the furnace front, and it also has an aperture 24 communicating with air supply pace 18, all for purposes to be described hereinafter,

It will be noted that I have provided a horizontally disposed bracket 25, secured as by the bolts 25a to the lower-portion of plate 22, and thus to the furnace front. This bracket serves as a support. upon which; to seat one of my improved fuel supply units in its associated relation with a furnace front, said unit having. flanges 26 secured as b bolts 26a tosaid bracket.

e unit housing 27 is provided with a bearing 28 for an axially disposed hollow shaft 29, and to said shaft-is secured the liubportion 30ofaradial pulverizer having the conoidalportion 30a carrying disks 31 provided with heaters 32 revoluble within steel linings 33. Each unit pulverizer is provided'with afeed pipe 34, having a flange 35, by whichit is bolted to the flange 9 of a tube 8, to thereby receive a supply of coal from the hopper 4, the pipe 34 having a delivery end 36 directed into the pulverizer and also having an annular flange 37 by which it is secured to the housing 27. It will be seen. that the lower portion of the feed 'pi e 34 is inclined in: a downwardly forwardidirectionand that the lower wall of said pipe merges into the conoidal central portion 38 over which the pulverizer. rotates.

Secured to the forward end of hub 30is an annular plate 39,, to be rotatable therewith, said plate lying in spaced relation to the outlet- 40 from thepulverizer, and; said plate carryin a fan. 41 that functions to pull the powd ered coal fromthe pulverizer. A tube 42, connecting the heated air supply space in the furnace front with the coal feed pipe 34', said tube having a control valve 43, permits an air stream to flow through the pulverizer as a vehicle for the powdered coal. in response to the fan opcratiom A deflector 42a extendsat a downward angle into feed pipe 34,'from the top of the aperture 42b. therein, that connects with. tube 42 to direct the flow of air toward the pulverizer. The air stream, laden with powdered coal, is delivered whirlingly by the fan into an annular space 44 formed in housing 27, and thence passes, still whirling, through a conoidalpassage 45 formed between the for ward. wall 46 of housing 27 and an angled ring 47'carriedby plate 39,.continuing from said passage into a delivery tube 48, that projects from wall 46, toward the furnace opening 14.

An air Gone 49 having openings 50 there- 'through provided with angled vanes 51, is

slidably mounted on tube 48, said air cone being actuable by manually operable rods 52 in its movement to and from the front plate 18, thereby regulating the admission of air into the furnace from the heated air supply space 18 to support combustion of the fuel.

Also associated with each unit is a prime mover for revolving shaft at high speed, and as an example of such prime mover I have shown a steam driven turbine having theoasing 53 and rotor with blades 55. The casing is represented as connected to the housing by means of brackets 56 which are secured to the housing by bolts 57, the casing part 58 having an end bearing 28a for shaft 29. The rotor 54 is directly connected to the shaft 29 for its rotation.

Usual means, such as a grid (not shown) in the base of hopper 4 may be provided for sizing the coal that is permitted to pass by gravity to the respective pulverizers.

At 59 and 60 I have indicated a main pipe line with branches 60a, each provided with a control valve 61 for delivering: steam to the respective turbines for their operation, and it will be appreciated that by closing the controls 10 and 61 for one or more of the units a boiler equipped with a plurality of furnaces can be operated at reduced capacity, such as for maneuvering purpos s.

' Thesteam exhaust meansis shown at 62, and steam may be returned therefrom direct tothe condenser (not shown).

Removably entered through the. hollow shaft 29 is an oil burner 63 having anatomizing nozzle 64 that is projected througlnthe delivery tube 48, axially thereof, for delivering an oil flame into the furnace, the oil burners-for-each unit being supplied with oil by means of a main pipe line 65, having branohes'GG forthe respective burners, and a return line 67, each: branchbeing provided with a control valve 68.

The oil burners are intended primarily for ignition purposes their flames serving to fire the pulverized coal whenthe turbine is set in motionand the. pulverizer. operated. Then the oil supply can be shut off: and the burners removed. Also the oil burners can be operated when a vessel equipped with the'dual coal and oil system is engaged: in maneuvering and the consumption of fuel is relatively small. Furthermore as will be understood the oil burning equipment supplementing that for coal burning in each unit permits operation with whichever form of fuel is most readily available;

Each oil burner is provided with centering devices such as are indicated. at 69, said centering devices beingcarried bv the burner tube to be removably entered therewith into the hollow shaft 29; Besides serving to center the burner within the hollow shaft the devices 69, which may have means of 1o a i V where pulver zed coal is intended to be em-' 7 ignition purposes.

anti-frictional relation with said shaft, thereby prevent the high speed rotation of the shaftfrom effecting excessive wear be tween the shaft and burner during the relatively brief periods while the burner is in its operative position for initial heating and It is to be understood that while I have herein described andillustrated oilburning means for use in initially heating a furnace ploye'd as fuel, and for igniting such fuel, my invention is not to be limited thereby as any other liquid or gaseous fuel, in place of oil, may be'employed for such purpose,

7 without departing from the general character of my invention with respect to the use of pulverized coal as fuel for operating a Scotch boiler.

Variations'within the spirit and scope of my invention are equally comprehended in the foregoing disclosure.-

I claim: 1. A fuel-pulverizing-feeding unit, for attaohment to a furnaceadapted for the burning of pulverized fuel, comprising a shaft 'mounted in bearings carried by said unit, f

r a pulverizer concentrically mounted on said 7 shaft and havmg an lmpact rotor whlch 1s burning pulverized fuel, said furnace hav- Y carried by said shaft, a feed conduit adapted to supply granular fuel to the pulverizer, means for supplying regulated quantitiesof pre-heated air to the fuel in its passage through said conduit and for assisting the flow thereof, a blower, including a fan mounted on said shaft and a hollow casing surrounding the same, which blower has an inlet connecting with the outlet of said pulverizer whereby pulverized fuel'is dis charged into said blower from the pulverizer, and means for connecting said blower with a pulverized fuel burner of a furnace, said unit being bodily removable from a furnace to which it may be attached and conveniently replaceable by a similar unit when desired.

' 2. The combination with a furnace for ing a hollow front and means for supplying air thereto, of a fuel pulverizing feeding unit attached to said front, said unitcomprising a shaft related axially to said front and mounted in bearings carried by said unit, a pulverizer concentricallymounted on said shaft and having an impact rotor V 'WhlCll is carried by said shaft, 'a feed conthe same, which blower has an inlet 'connecting with the outlet 'of said pulverizer whereby pulverized fuel discharged into saidblower from the pulverizer, and means for connecting said blower with a pulver-' ized fuel burner ofa furnace, said unit being bodily removable from a furnace to whichit may be attachedand conveniently replaceable by a similarunit when desired.

Dated, New York, August 2nd, 1927.

, GEORGE PFHAYNES.

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