US1365663A - covert - Google Patents

Description

2 SHEETSSHEE1 'I.

Patented Jan. 18, 1921.

E. C. COVERT.

APPARATUS FOR FEEDING PULVERtZED FUEL.

APPLICATlON FILED MAY 31, 1919 1,365,663.

TUE 1- 2 f L E. C. COVERT.

APPARATUS FOR FEEDING PULVERIZED FUEL.

APPUCATION HLED MAY 31. I919 1,365,663, Patented Jan. 18, 1921.

2 SHEETSSHEET 2.

f UNITED STATES PATENT OFFICE.

EDSON G. COVERT, 0F AVALON, PENNSYLVANIA, ASSIGNOR TO HEYL & PATTERSON, INQ, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

APPARATUS FOR FEEDIN G PULVERIZED FUEL.

Specification of Letters Patent.

Patented Jan. 18, 1921.

Application filed May 81, 1919. Serial No. 300,881

To all whom it may concern:

Be it known that I EDSON C. Cove, a citizen of the Unitedtates, and resident of Avalon, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Ap aratus for feeding lulverized Fuel; and do hereby declare the following to be a full, clear and em ct ilescription thereof.

My invention relates to apparatus for fee lug pulverized fuel.

The object of my invention is to provide an ellicicnt and simple means of supplying fuel and air in the proper proportion that the mixture will be uniform to the suction side of a fan or circulating medium and to provide means for the delivery of said fuel and air mixture toa single furnace with a number of burners or to a number of furnaces, thereby dispensing with a separate fuel storage and feeding device at each furnace.

Generally stated I employ a closed pipe circuit beginning at the discharge of the fan and terminating at'the suction side of the fan. The pipes composin the circuit are of such size that there Wil be sufiieient of a miniture being retunled to thefan at all times so than the velocity in any path of the c rcuit "will never be below that required to an to overcomethe inability of securing an adjustable speed powerunit to supply the proper proportion of fuel to the system I 3 employ a variable or adjustable speed motor for aminimum and maximum speed with a number of equal intermediate speeds, and by means of a bypass piple from thz fpipe circuit adjacent to the disc "ar e side t e fan I am enabled to releasean give amount of fuel from the pi circuit equal to that fuel being supplied b; an adjustable speed motor at its minimum speed. y

In the accompanying drawings, Figure l is a side elevation of my improved apparatus, one of the furnaces being shown partly in section; Fig. 2 is an enlarged side elevation of'thsupply hopper, the: feeder, fan, etc, the pipe circuit. being broken away and the diaphragm and air valve operated thereby being shown in section; and. Fig. 3' is it view of one of the furnaces partly in sectionshowing one of the pipes for delivering the fuel to the furnace.

the fuel in the mixture in suspension,

circuit. L a e A -,a,ble valve 19 connected by t e rod to the the feeder driven by of said lever is conn ted the Referring to the drawings the numeral 2 designates a suitable storage-hopper for containing the pulverized fuel. At the discharge end of said hopper is the feedin mechanism 3 which it has not been deemed necessary to illustrate in detail, the same bemg a form of feeding mechanism for which Letters Patent of the United States #11977 99 were issued to me. on the 12th day of September 1916- Ashunt-wound motor 4 is provided for driving the screws of the feeder 3.

A suitable fan 5 driven by a motor (not shown) provides the air for mixing with the fuel delivered to the suction pi e 6 by the pipe 7, and the combined air an fuel is forced by said fan through the pi e circuit Bmmging a complete circuit wit the air p1 e passes by the pipe 16 through the valve 17 to the air pipe 9 where it is a sin combined with the uel delivered b t e feeder ;3 to be carried by the fan t rough tliepipe circuit. r

A vent 18 is provided for supplyingair to the in the by-pass pi e 14 isa suitlever-arm 21 of the field rheostat 22.. A rod 23 connects said lever 21 tii thelever-a'rm 24,

said arm havin the slot 25 'which'enga es the pin 26 on t e hopper 2. The opposite end of the lever 24 is ivot'ally connected at 27 to-thenut28 on t e screw-shaft 29. i A

lever 30 has the slot 31 wh'ch engages the pin 32 on thenut 28 and t e opposite and crank 33 connected by the link 4 to the air valve 35.

A diaphr m cham or 36 has the" diaphragm 37 w ich is connected by the link 38 to the switch arm 39 carrying the Wei ht 40.

.ranch pipes 10 connect with the pipepipe 16 and eventually to the pipe p The inner end of theswitch arm 89 w on in 11-0 air to re fiufdre 19 always being open when .the lever 21 mg of airi motor tospeed.

neutral position lies between the contacts 41 and 42.

The screw-shaft 29 has the large gear wheel 43 which meshes with the pinion 4-4 on the shaft of the air valve motor 1-5.

In the operation of my improved feeder the circulating tan is first started which will continue to circulate the mixture entrapped in the pipe line and at the some time draw in sul'licient new air through pi )e 16 and valve 1? to make up for that: mine dispelled through pipe 14 and valve 19 This the total g through valves 12 in pipes inn that being expelled through air esca )in 10 is less tvalve 19 in pipe 14.

The feed motor 4 is then started by closing the knife switch 46 which causes current to flow through the fiek rheostat 22 which is shown in minimum speed position, to the motor, causing feed screws in feeder 3 to re Tolve, thereby feeding fuel from the storage hop )er 2 through pi we 7 to fan suction pipe 6 w 1en fuel is mixed with the incoming air from valve. 17 and pipev 16 and that mixture being returned frompipc circuit 8.

The fan will contmue to circulate this mixture through circuit 8. with an amount of fuel and air equal to that fed to the tem by feeder 4 and through valve 1? and pipe 16 bein r fed to separator 15.

As it is (esirc'd to place fuel consuming devices 11 in operation valves 1:! in branch .pipes 10 are opened by means of chains 13 which causes a rush of the fuel mixture in pipe circuit 8 to enter fuel cousumingdevice I, and also causes a vacuum in pipe 9 thereb causing cliaphragmlii which is at tachcd to lever 39 to descend making an electric contact at 42 causing motor 45 to revolve screw 29 causing feed nut on screw to t'ra vcl toward gears;

V 'l'his movement of the nut :28 will act. to move the lever 30 and will open the air valve 35 to a polnt that will admit sufficient.

As soon in pipe normal to norfuel to as'this point is' 9 and valve 35' and diaphragm nel consuming devices,-

reached. air pressure will againbecome will again ascend causing motor (to-stop. 4 a

'As the air valve 35 was hein r opened in the manner above set forth tie lever 24 was 'Inovedand through the'lever rod 23, i of'the field rheostatv 22 was moved over causing motor 4 to revolve faster and feeder 3; to convey more fuel to pipecirouit, the speedo-f feeder 3 ain] the fuel fed y'same be'nf in, synchrony with the open p it V4235 andai; entering circuit The motor 45 Willflmntiuue to operato'. thertby ausirigrair valve 35" I tip-as additional valves 12 )lace that. going together with umspeed of feeder 3 to open and on pipes In to fuel ('(Jllslll'lllllg' devices are opened, until field rhcoatat lever :2l causes slotted lever Bi to close by-pass valve 19 which ivill inunediatci'v cause svstcui to re-- ad just itself to the new conditions.

The diaphragm valre will ascend making electric contact all causing motor in to rcvolve in opposite direction. and through gears 44.- and 43 revolve screw 29 calming nut 28 to travel a way on drawing causinp valve 15 to close and through levers 23 and 24 return handle control ol licld rheostat toward minimum speed position causing motor 4 and Feeder $3 to slow down and feed on amount of fuel equal'to that required for the volume of air enterinr through valve 35.

'hen pressure. again becomes normal in pipe 9, diaphragm 3.) will descend breaking electric contact 41 and causing motor 4.3 in site .1.

'lhe placing in operation of additional fuel consuming devices will again cause dia phragm to descend making electric contact at 42, thereby opening valve 35 and speeding up feeder motor t and the shutting down of fuel consulning-devices will make elec tric contact at 41 reversing the operation.

he arrangement as nl nc described will continue to readjust its lf t demands, the excess fuel and air mixtur openings 12 to fuel LUllSlP-i-HQ' derices'hcing returned to fan and again circulated through pipe circuit.

The e will be no fuel and air mixture escape to separator if through valve l9 and pipe let until such time as ('l)(.ill'1l0lllll3 of 'Fuel being consumed is less than that being fed at minimumspeed of feeder l, when valve 19 through connection 241 and by rcason of position of lever 2i on field rheostat 22 :n'itomaticall opens; valve [9, which will again those a rcai'ljustincnt of apparatus to suit new conditions. The valve, .19 remaining open and an amount. of the fuel and air mixture equal. to that fed by the minimum groi rig to -se pa ra tor l5v As the valves 12 to fuel consuming dellil vice-3 l1 are closed the; diaphragm will continue to descend motor 4.5 rotate closing valve through feed screw 28 and nut 28 motor 4 sloi v down to its minimum' feed position. v y L R When fuel consuming devices are \10 longer-in operation knife switch. 46 may be pulledstoppingv motor 4. a

A continual swing of the'fan will draw a snflicient amount of air-through pipe 16 to make in forthemixture being dispelled through-p pe 1-1 to separator ltiwhich can l .oontin e uhti l fuel mixture'is entirelyelimiin pipe circuit and same contains when fan can be shut down claim 1 1. In apparatus 'for' feeding fuel, the combination of a storage hopper,

pulverized 1'30 a fan, an endless pine circuit, valve cona continuous pipe circuit, valve controlled trolled outlets from said circuit leading to connections from said pipe circuit to fuel fuel consuming devices, a by-pass pipe conconsuming' devices, means for delivering neeted to said pi )e circuit, an automatifuel to said pipe circuit, a variable speed cally operating va ve in said bypass, Said motor operating said feeding mean a by by-pass pipe communicating with said atorpass pipe cormnimicating with maid pipe 50 age-hopper, means for supplying air to said circuit and with said storapediopmr. an au fan, means for feedingfuel to said pipe tomatically operating valve in said i ymascircuit at the suction side of said fan, and pipe, an air pipe conununicating with said means operated by the vacuum on the one pipe circuit, a fan in said pipe circuit, an

tion side of said fan for automatically con ,air valve on the suction side of said fain .5, trolling the amount of fuel and air admitted a diaphragm on the auction aide of said to said tan. ian, an electric switch operated by said 2.111 apparatus for feeding pulverized diaphragm. a motor. connectiona lu'tweei'i fuel,the combination of a storage-liopper, a said motor and said air valve, a rheoatat fan, an endless pipe circuit. valve controlled operated by said last named motor. and 0a outlets from said pipe circuit to fuel con connections between said rheosiat and will suniing devices. a by-pasa pipe coniniunicatvariable speed motor \vherch the speed of in; with said pipe circuit and with said the. fuel feedingiineans is varied and the air storage-hopper. an automatically operating supply to the fan is properly proportioned.

valve in said by;pasa pipe. means for sup 5. 1n apparatus for feeding pulverized 65 plying air td said fan. means for feeding fuel. the combination of a atoragwhuppera fuel to said pipe circuit, a diaphragm on continuous pipe circuit. a fuel feedeiu a vathe suction side of said fan. a valve for conriable speed motor connected to said feeder, trolling the auppl) of air to said fan. a mo- :1 tan in said pipe circuit. a Irv-pa. pipi- -tor operated by the movement of said diacommunicating with said pipe circuit and 7 phragm connections between said air valve with said storage-hopper. an autmuaiically and said motor connections between said operating valve in v aid X-Pilsx pipron last named connections and said fuel teedair intake pipc a valve in said pipe. a diaing means whereby the fuel and air to the phragni, an electric motor operated by iln;

pipe circuit is automatically controlled. movement of said diaphragnn c innartioiis 75 3. In apparatus for t'eodil'ig pulverized between said motor and said air valve, and fuel, the combination of a storage-hopper, a means operated by the moveincntoi said air continuous pipe circuit. a fan in said cirvalve tori-hangingthespred ol'aaid .hl'lfllllu cuit means for feedinp varying amounts of speed motor: whereby the movement of said fuel to the suction side of said fan, a b vair valve and the variation of speed i said 8' pass pipe communicating with, said pipe feeding device takes place sinniltaneously circuit, and with said hopper, means for supin testimony \vhereol'. l the said lineal; plying air to the SHQtion side of said fan, t. Cori-arr. have hereunto set my band 40 and means for varying the supply of air, EDSON {a o and for simultaneously varying the amount of fuel fed to said pipe circuit. Witnessee:

4. In apiiaratus for feeding pulverized Roar. D.T0'1"IEN, fuel, the combination of a storage-hopper, JOHN F. VILLA

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