US1468966A

US1468966A - Terson

Info

Publication number: US1468966A
Authority: US
Publication date: 1923-09-25
Anticipated expiration: 1940-09-25

Description

Sept. 25 1923. 1,468,966

c. F. HERINGTON PULVERIZED FUEL FEEDING AND DISTRIBUTING APPARATUS Filed Sept. 14. 1922 2 Sheets-Sheet 1 SHFETY l/E/VT' COLLEC7'GH 2 BY-PflSS PIPE 13 570/5765 BIN 4 0 13 4 5 0 E Com L W R COMM/Fr CONTROL 7 Vflfi/ABLE SPEED 0107M 500 no PIPE A 9 [I FUR/V as M An/ans All INVENTOR Sept. 25,1923. 6 1,468,966

C. F. HERINGTON PULVERIZED FUEL FEEDING AND DISTRIBUTING APPARATUS Filed Sept. 14. 1922 2 Sheets-Sheet 2 7 W, 455M144; a m/11h Fatentecl Eept. 25, 1923.

UNITED STATES PATENT OFFICE.

CECIL F. HERINGTON, OF PITTSBURGH, PENNSYLVANIA, ASSIG-IQ'OR TO HEYL & PAT- TERSON, INC., 011" PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

PULVERIZED-FUEL FEEDING AND DISTRIBUTING APPARATUS.

Application filed September 14, 1922.

Be it known that I, CECIL F. HniuNo'ror-r, a citizen the United States, resisting at Pittsburgh, in the county of Allegheny and State of Pennsylvania. have invented a new and useful Improvement in ulverized Fuel Feeding and liistributiug Apparatus, of which the following is a full, clear, and exact description.

The present invention relates broadly to pulverized fuel handling sy tcms, andinore particularly to means for effecting with such systems a fuel teed re 'ulatecl. in accordance with demands upon the system.

it has heretotore been proposed to provide systems of this character having a lain circulating or distributing and return line adapted to supply a plui lity ot dill'crent fuel-coo ing devi e1 iii a mixture oi i ulverieecl fuel and air. In certain 02'' these sysenis there has been provided means dependent upon variations in the density oi the fluid and fuel \vitl'iiu such line to;- effecting a regulation of the amount fuel "fed to the line whereby the iced ])ro portioual to the demands upon the syste, n. This has been accomgiilishcd in some cases by the use of a body oi Water and a float, changes in the density Within the line gird ducine clump "es in the water level which 1 to an were in turn transmitted by the Float e ectric controller ol suitable construction thich systems have been objectionable not- .c c b one einbodiuieut oi? the *sczit invention it lacing; understood that he drui'viu, s do not define the limits of this invention e1 ihat clum s may be made i: the I .on on rd sclosed ther n fithout deuars' from the spirit or scope of my broseer claims.

Serial No. 533,237.

In the drawings Figure l is a diagrammatic view illustrating one form of pulverized fuel handling system; and

Figure 2 is diagrmnuiat-ie view illust ating the electrical connections lfor co ling the fuel "feed,

In systems of this nature it is desirable during operation to maintain substantially constant velocity f air for prog ielling the pulverized fuel. This is neces ary in order to maintain the fuel suspension. Ordinarily this is accomplished by providing: a tan or blower havin the desired characteristics. It is also advantagais to etlect a positive regulation o!" the fuel fed to the system whereby the amount 0'? rural will vary the number or capacity Of the 'luelconsuming devices varies.

Referring more particularly to l l'ure l of the drawings there is illustrated one embodiment of the present invention. This may comprise a collector of suitable construction supplied with pulverized through a coal transi'iort lino as is cue ternary in the art. The illec or it has its outlet (meretivcly connected with a storage bin 4 -for supplying; the sonic with ssary quantity of pulverized i'ucli Located at any desired uoiut spect to the storage b n +3? a plurality iil1l COHSlllHlIljf devices it will h vious that the cherecl'cig number a H rangeinent ot the: devices may vary considerably and the term is used as definitive of any type of burner, boiler, furnace or the like adapted to be supplied with pulrez' "l tueli For delivering; the

ineo e air may be supplied to the system to :lr(t

the demands thereu fion through Silly/e pipe 10 having a goose necl 1.1 open to the atmosphere and an auxilierv connection 12 leading to the upper part of the 2 for Withdrawing dust-laden air therefrom.

incl

.blade oi the main switch distrilnitingpipe to the collector. This b In order to keep from overloading the system with pulverized ii'ucl, ted thereto as pointed out in detail hereinatter, urnler certainconditions of operation, there is provided, a bypass pipe l3 leading from the pass pipe may be opened to permit a continuous circulation thercthrouqh.

Directly connecting each of the incl-consuming devices with the distributing t-ipc is a branch pipe 14:, each of which may h supply of secondary The i through each of the branch pipes may be sary to feed fuel to the distributing pipe,

while it all of the valves 11.5 are open it w l be necessary to feed the maximum amount of fuel to the system For effecting the fuel feed, the outlet from the storage bin l: to the suction pipe 9 is provided with a coal controller 17 of well known construction, snch. for example as illustrated in the patent to Covert 1,197,799 of September 12th, 1916, and comprising two screw feeders combined in such way that neither can feed independently of the other and that when at rest each seals the other against the passage of any material.

The operation of the screw feeders is adapted to be. effected by a variable speed motor 18, as illustrated diagrammatically in Figure 2. This motor is adapted to receive current from the supply line L through one S and thence through a connection 19 and brush 20. The other brush 21 has a connection 22 with the contact oi a suitable contactor switch 24. This switch is normally held in open posi tion by any suitable means. such as a spring 25, and is connected through the wire 26 and the other blade of the switch S with the line wire L.

The contactor switch 24;

is adapted to be moved to closed position a. solenoid 2'? the solenoid being energized by the movement cl? any one of the valves closed to open position.

l 5 from 'ih'is operation inay be obtained by securing to the pin 28 of cash of the valves l5 :1 contact lever 29.

The contact levers 29 for all of the valv s are (Olllltnjflfl in series with each other by suitable connections as illnstratcch with the field 30 of the variable speed motor through an adjustable resistance 31 and with the contactorswltch 24. When the valves he a full field on the variable'speed motor. l'Vith this lield the niotorwill have its inininnnn speed while as the resistance in series with the hold is increased the motor will attain higher speeds. ll ith'all of the valves 15 in closed position the contactorswitch 2d will be in open position, whereby no fuel will he fed to the distributing pipe. If, however, one of the valves 15 is moved toward open position, the corresponding contact lever-.29 will be moved from the position illustrated in Figure 2 to a position where it will engage one of the contacts 32 oi the cooperating resistance units. This will throw increased resistance into the field circuit, the ainount of the resistance increasing in proportion as the valve is opened At the Sillfig time, the cont-act lever 29 so moved will close the circuit to the solenoid 2'? by reason of the provision thereon or a'condnctor 33 carried by an insulating base 34. This conductor 33 will be brought into contact with segmental conductors 35, one of which has an electrical. connection with the line wire L", while the other has an electrical connection 3? with one side of the solenoid 27 and thence through the connection 19 to the line wire L. As the segmental conductors 35 of each oi the switches are connected in parah lel with the corresponding conductors of the other switches, it will be apparent that movement of any of the valves 15 toward open position will close the contactor switch and will throw into series with the field As each opening n'un e'incnt of the valve.

otional valve is o 'iened, add1tional re- .lQl oi' the variable speed motor and the speed oil rotation thereof will be comes pondinglyincreased. .lhis in turn will in crease the, speed oi i 'otation oi" the screw tenders in'such manner that an additional ainoinit of iuel will be l ed from the storage bin l intolhe distributing pipe.

- stance will be thrown into series with the It will be apparent that with a system of I this chactcr the total amount of resistance in all of the valve regulators when added together will be such as to give the ma; inuin speed desired from the variable speed inotor. in this manner the variable speed ino tor may he CfHESfH 1o rotate trons minimum speed to maximum speed in accordance with the position of the valves ior thereby it'eaidiugz' a A amount of fuel which is exactly proportnt-nal to the demands upon th system as determined by the operation of the :i'uclwaonsm; devices. This el fects a positive control of the variable speed motor, the change in speed occurring concomitantly with the change in the position of the valve or valves, thereby eil'ecting an immediate change in the tnel feed.

operation, the valves 15'Will normally all be in closed position. There will, therefore, fuel required in the distributing pipe. no blower 7, however, will be started to arodnce the desired circulation of air, so l t upon the openii'ig of any valve 15 the fuel in suspeusion. As additional fuel-consuming d ovices a re placed in operation, additionair required to satisfy thedemands of the l|l()\'\"31 7 will be sucked in through the air sup fl l0 and combine Withthe airand in mg through the return line 8.

The provision of the independent field :neostt 3]. enables the speed of the variable n1 irrespective of the positions of the contact levers 29, to thereby more accurately proportion the amount of fuel to the air.

I claim:

system, a distributfed therefrom, mech;

'to said distributin said br varying the demands upon l means automatically operable with said notable means irrespective of the pressure sysi;

in he system for varying the amount oi fuel led by said mechanism, substantially as described.

2. In a fuel handling system, a distribo pipe, a branch pipe ted therefrom, mechi for supplying fuel to said distributipo proportional to the demands on the system, movable means in said branch pipe 1' tie demands upon said system,

1 t e means 1 respective of? the pressure in the system for the amount of fuel fed by said or said movable means in one direction for said mechanism inoperative, substantially as described.

t In 't'uel handling system, a. distributing pipe, a branch pipe fed therefrom, meoln anism for supplying fuel to said distributpipe proportional to the demands on the stem. mo'able means in said h ir s eci 1e ure 'ne st in re tve of ti ress 1n t s e led by the controller 17 will be carried.

v ment of the movable .2

.ing pipe, a branch pip n, and means operable upon movefor varying the "-mount'ot fi'iel. fed by sa d meehani and means operable up move- Inont of s l movable means for rendering; said mechanism operative or inopersnve, substantially as described.

5'. In a fuel hamlling svstein, pipe, a b ECll pipe it n l mally inoperatise m :hsnism operative for sup iiying; for. l'riouting pipe, movable the passage 0* *Zuel throu and actu nnp' connecti mechanism and theniova derings .cha mon a distribut- ..e:ins :tor ren-- upon moveto permit pas branch pipe, subsage of fuel through ear. stantially as described. 7

6, In a fuel handling system, a distribut P ted Mere-from. a

chaf 1 e i suppl distributing pipe, movable 1 ling the passage of fuel through pipe. FiCillfltilig. connections between v mechanism and the movable means for reodoing said mecl'ianism opeial. 0. upon move ment of the movable means to init passage of fuel through said branch pipe. and

'rmally for varying amount ct luel fed by said mechanism in accordance with position of said movable means, substantas as described.

7. a fuel handli n s pine, a b anch p for SYUL plying 5 fuel through electrically conncctii i: wi h s i 'n described.

8. In a fuel handling a distrilnrtin; pipe, a branch pipe lliei'otroni. a normally inoperative moclnmis-"sn cfhacl'i 1 when operative for su plyin i'uel to said distributing pi e, movable 'cneans controll ng the passage of fuel, through H 1* brancl'i pine, means electrically connecting said movable means with s mechanism for rendering e concom iantlv with the movement of said movable I118? and means electrically COBHGCtl f said noval'ile and said mechanism ,n- 1 he I anism operative to tend an amo nt of luel proportional to the movement oi the movable means, substantially as descril 9. In a fuel handling system. a

ribut- .ing pipe. a branch pipe ted tl'ieretrom. mechan ism for i'ecding t el to the distributing ole pec! motor or opcr: a said mechann is controlling the flow of fuel through .i I i c. and a resistance reg'z'ulatei' rectly operaca'l by f l valve for controlling the speed of rotation pipe, a va er the variable speed i'notor, substantially as described. T V

10., In afuel handling systein, a distributing pipe, a branch pipe fed therefrom, niechanism for 'fGfidlllQ? fuel to the distributing 7 vie a variable soeed motor for oeeratin a, v c l n qsaidinechanism, a valve controlling the rlow 4 of fuelthroughi'he branch pipe, QrIFGSlSllflfilCO able means controlling the "passage of meansoperatively connecting each of .ineans and said inechanisinfor varyingthe id inechanisnr in.

regulator directly operated by said valve for controlling the speed. of rotation of the variable speed niotonand means for rendering; said motor operative automatically upon inoveinei'it of the valve from closed position,

substantially as described.

ii. in a. pulverized fuel handling system, a distributing pipe, a plurality, of

branch pipes adapted to be supplied thereby, mechanism eifectivefcr feeding fuel to the distributing pipe, independently n'iov p i'uel through each of saidbranch pipes, and

amount of fuel fed by accordance with the demands upon the systeni, substantially as described.

12.111 a pulverized. fuel handling system, a distributing pipe, a plurality of branch pipes adapted to be suppliedthereby, mechanism effective for 'fBECllL Z fuel. to

the distributing pipe, independently nov-i able n'ieans controlling the passage of fuel through each of said branch pipes, and means electricallyconnecting each of said n'ieans and said mechanism for varying the 'amount of fuel fed by said mechanism in accordance with the demands upon the sys tein, substantially as described.

3 7.3. in a pulverized fuel handling system, a distributing); pipe, a plu 'ality'of branch pipes l(ll.t '-'-)t6(l to be supplied thereby, mechanism effective for feeding fuel to the distributing pipe, independently movable ineaus controlling the passage of fuel through each of said branch pipes, and n ieans automatically operable with the movement of any of said movable means irrespective of the pressurein the system for varying the amount of fuel fed by said scribed. V

'15. In a pulverized fuel handling sysa distributing line, a plurality of fuelconsuining devicespfed thereby, independsaid ' velocity throu naeaeee ently movable means controlling the sup ply of fuel. to each'ofsaid devices, a circulating" blower, a fuel feeding mechanism,

g each of .said

ineaus operativ y connectji indcpc iv )vable is with said iiiechaiusi ior varying; theifuel fed bysaid cchanisin in accord nee with thefuel c'on ed by said devices, v i epcndently 'c id by said niechanisin, sul stan-tially as de- ;roll ng the aux-cunt of fuel scribed.-

-16; In a pulverized fuel hai dliugsystern,

an endle s c rculating line, a branch pipe fed the:v

one, mechanism for supplying pulverized iuel to said l ne proportional to the dein demands upon the system, andineans directly controlled by said rnovable nieansfor varying the amount of fuel fed by said ll clle sin, substantially; as described.

17. In, a pulverized fuel handling system,

"an endless circulating line, a branch pipe a normally I inoperative 7 fed therefrom, mechanism GffQClZiVG WlEGH operative for suppl pulverized fuel to said line, Inbvable means controlling the passage of fuel thro gh the branch pipe, and means con ands upon the system n'iovable scans in saiu branch pipe "for varying the insane for in U necting said mechanism and movable means for rendering said mechanism operative upon inovenieiit ofthe movable means to permit passage of fuel through said branch pipe, substantially as described. I V

18. A fuel feeding systenii having a continuous circuit through which fuel and air are circulated, a delivery pipe leadingfrom said circuit, valve means for varying the delivery of-air and fuel through the delivery pipe, means/for causing the air and fuel to circulate at substantially a constant h the circuit, means for admitting: air to the circuit to compensate for the air passing through the delivery pipe, means for feeding; fuel to circuit, and ontrol means connected to the valve means for varying; the fuel feed in accordance-With variations in the valve means, substantially as described.

19, A fuel feeding; systeni having a con-' tinuous circuit through which fuel and air are circulated, a plurality of delivery pipes leading from said circuit, *alvejnieans associa ed with each delivery pipe for varying the deiiverv of air and fuel through said delivery pipe, nireai'is for causing the air and fuel to circulate at substantially a circuit, I means for admitting; air to the circuit to compensate for the air passing; through the constant velocity through the delivery pipes, means for feeding fuel to said circuit, and control means connected to each valve means for varying the fuel feed in, accordance with the variations in-thevalve m ans, substantially as described.

20. An apparatus for feed ng a constant I 1,4es,9ee

mixture of fuel and air to a furnace whose consumption varies, comprising an endless circulating line, means for circulating the mixture through the endless circulatingline at a sufficient velocity to hold the fuel in suspension means for passing some of the mixture from the endless circulating line to the furnace, means for controlling the flow 01"? mixture from the endless circulating line to the furnace, means for feeding fuel to the endless circulating line, and connec tions between the means for controlling the flow of mixture to the furnace and the means for feeding fuel to the endless circulating line, whereby the feed of the fuel to the endless circulating line is directly Varied by the Variation in the feed to the furnace and independent of the velocity of the flow or pressure of the m xture in any portion of the endless circulating line, there being means for supplying air to the endless circulating line at the rate it passes to the furnace, whereby a constant mix is maintained for supplying the furnace.

In testimony whereof I have hereunto set 25 my hand.

CECIL F. HERINGTON.