US1588149A - Coke-producing-oven regulator - Google Patents

Description

June 8 1926.

w. M. SHALLCROSS com: PRoDucING OVEN REGULATOR Filed Sept. 27 1922 3 Sheets-Sheet 1 MM P June 8,1926. 1,588,149

W. M. SHALLCROSS COKE PRODUCING OVEN REGULATOR Y gbl?? 5 sheets-sheet 2' Patented June 8, 1926. i

l. UNITED STATES WILMER ivr. sirALLcaoss, on MILWAUKEE, WISCONSIN, AssIGNOn To sHALLoRoss CONTROL sYs'rni/is' oo., or MILWAUKEE, WISCONSIN, A CORPORATIONOF Wrs- CONSIN.

Application filed September yuseful improvements in coke producingV ovens and refers more particularly toa regulator therefor. 1 v 4 All coke producing ovens may be said to broadly consist of a heating chamber surrounding a colingretort, the heating chamber being heated either by burning therein of coke or gases, the gases'given ofi'y by the coke being formed being conveyed tok a place of storage through a hydraulic main.

, Thebuint gases ,are conducted from the oven through devices designedfto usefully extract the heat therefrom and are` finally led through a conduit or duct preferably disposed under thev ground to an ordinary stack through which they are expelled'a cool a temperature as possible. In gas Ovens it is highly ,important that the flow of burnt gases through the 'exhaust conduit to the stack, vand*consequently the pressure therein, be ymaintained substantially uniform to prevent bach ypressure in the heating chamber and the' consequent seepage of the burnt gases thro-ugh the porous brick walls of the retort and the resultant dilution ofthe pure gases given off by the coke being'formed.y The uniform pressure `maintained onrthe'exhaust gases is also r a material aid toward maintaining uniform temperatures in the heating chamber. Y

Heretofore the control of the r How through the exhaust conduit has been manual, i. e., a valve within the conduit is 'set at an approximately correct position and `maintained at this adjustment. This procedure results. in a loss of gas produced and under manual vregulation ofthe gas lof a coke ovenl in which the heating chamber temperature is maintained by the gas produced in the coke retort there is approximately surplus gas Whichis vgenerally sold commercially and 40%of gas employed in maintaining the temperature of the heating chamber.` Experience has proven that with automatic regulation, and the consequent maintenance of the pressure in the conduit at a substantiallv' uniform degree, the surplus gas is materially increased and the amount required for maintaining the tempera-ture of the'he'ating chamber is much less, resulting in a considerable saving over the manual regulation, which is of tremendous importance in the commercial field.

Therefore, having the abo-vein lmind it lpressure therein substantially constant.A y It is another yobject of this invention'to the conduit.

PATENT OFFICE.; g.

ookn-rROnUoiNe-oviin REGULATOR.

27, i922.. seri-a1 No. seaseo.

,vide means for maintaining the |flowy of burnt gas through the yexhaust conduit is'ubstantially uniform, and consequentlyv'the speed up and facilitate the automatic regulation of the valve member controlling the rateof flow of burnt gases through the conduit by varying,thev speed of the valve member actuating f'motor' `in lproportion to the change of pressure to be corrected.v

Itis another object of thisinvention to provide meansfory visually indicating when the valve actuating motor is atv rest, and When'it is operating in either forward orv reverse andr at what speed. l

' It is a furtlierobject of this invention to pro-vide ya motor .actuated valve for controlling the rate of 'iow of burnt' gases through the exhaust 4conduit and maintainv )gig the sainesubstantially uniform 'having iioat means for controlling the same, which float means is controlled by 'pressure from A 'further object of this invention resides in the provision of an improved type of .control for thevalve actuating motor hav- `ing means for indicating thepressure maintained Within the conduit." v

And a still further object of this invention resides inthe provision'of an improved control for; the valve 1 actuating motor in which the float proper is suspended within the pontoon chamber by a spring member.

Vith theabove and other objects in view which will appear as the description pro- (reeds, my. invention'resides in the novelconstruction, combination and arrangement of parts 'substantially `as lhereinafter `described and more particularly defined 'by the. ap-

pended claims, it being und'erstood'-that such changes in the' precise embodiment of y the herein 4disclosed invention may be` made as come within the scope of the claims.

In thev accompanying drawings, I `have illustrated one complete examplev ofthe physical embodiment of my invention' "constructed according to the best mode I have so fardevised for the practical applicationy of the principles thereof, and in Whi`ch:-`

' Figure l isa diagrammatic illustration of a coke plant, parts thereof being broken away and in section; i ,y i V; f f

FigureQ is 'a diagram of the eircuitseinno l ployed in connection with my improved partly in control;

Figure 3 is a view taken through the transmissionbox for connecting the valve member actuating motor with the valve on the plane of the line 3-3 of Figure 4;

Figure 4 is a view partly in section and elevation taken transversely through Figure 3 on the Vplane of line 4 4, and

Figure 5 is a view ypartly in section and partly in elevation of the control for the valve member actuating motor.

Referring now more particularly to the accompanying drawings in which like numerals designate like parts throughout the several views, numeral 6'designates a coke oven including a coke retort 7, a heating chamber or chambers 8 surrounding the same, a lduct 9 connecting the coke retort with a hydraulic main 10 through whichr the released gases given olf by the coke being formed is conveyed prior to having the valuable contents thereof extracted and the gas remaining divided in two parts, one part of which is stored for commercial purposes and the other reconducted to the heating chamber where it is burnt, and 11 designates a duct or conduit connecting the heating chamber 8 with a stack 12 to which ythe burnt gases are conveyed after they have previously been passed through boilers o-r regenerators to extract the heat therefrom, duct 11 being preferably disposed under the ground. It is highly essential that the rate at which the burnt gases are expelled from the heating chamber through duct 11 and at stack 12 be maintained uniformand ata degree which will prevent back pressure in the heating chamberand thefconsequent seepage through the walls of the re-l tort of the burnt gases resulting inthe dilution of the gases produced by the roasting ofthe coke, or the'laclr of insufficient pressure in the vheating chamber and the consequent seepage through the walls of the ore tort of the gases generated therein and the consequent loss thereof.

In other words, it is essential that the rpressure within the retort and within the heating chamber be balanced and that advantage is accomplished by means of regulation of the flowV of gases from the retort by means not shown and the control of the lflow of burnt gases from the heating cham- .ber by the means hereinafter described.

Positioned-within duct 11 at some position between the heating chamber and the` stack 12 is a valve member 13 which is movable to'and from a closed position and in this invention the valve member is mounted on a shaft 14 which is connected with a shaft 15 driven through reduction gearing hereinafter described by a motor 16. The reduction gearing and motor 16 are mounted in a casing 17 and consist-of a vertically journaled shaft 13 having its lower end connected by a universal couplingr with shaft 15 and its upper end mounting a larger beveled gear 2O with which is meshed a drive pinion 21 carried by the outer end of a shafty 22 on which is intermediately mounted a wormk wheel 23. W'orm wheel 23 is engaged by al worm ,24 mountedon a shaft 25 journaled in an inner housing 26 and having thereon, adjacent oneend, a worin wheel 27 with which is meshed a worm 23 mounted o-n 'a shaft 29 extended outwardlyof casing 26 and connected `with rmotor 16 by a coupling 30. kBy enclosing the worm wheels in casing 26, the same run in oil to thus insure efficient operation.

Motor 16 is controlled torun either forward or reverse at a speed proportionate to the change in pressure to be corrected by a pontoon switch unit designatedgenerally as at 31 and consisting of a casing 32 having an intermediate partition or wall 33 therein on the upper face of which '1s' formed an annular rib 34 to define an annular water chamber 35 in which is suspended the depending ange 36 of the gasometer 37. The depending flange of the float is preferably tubular to provide a dampening effect and the lower portion thereof is disposed beneath the vlevel of the liquid within chamber 35 to prevent the passage of gas from the space 39 between the gasometer and the rib 34 to the space between the fiange and the casing 32 proper.

As illustrated in Figure 5, aninlet 40 communicates with the space between the annular rib 34 and is connected lwith the interior of duct 11 at a point between the valve member and the heating oven by a conduit 41 so that the float is influenced by the pressure in the duct inwardly of valve 13. To insure absolute accuracy, the gasometer is suspended and supported by a spring 42 concealedk within a tube 43'communicating with casing 32 substantially in aline'- ment with the axis yof the annular rib V34 and the lower end of the springis connected centrally with the gasometer by passing through an opening in the end 44 of -a bell crank lever 45 toI be later described, which is in turn connectedv with the spring the upper end of which is connected as at 46 to an adjustable post or screw 47. Screw 47 passes outwardly of tube'43 through a cap or cover 43 closing the end thereof and has a knurledfnut and adjusting wheel 49 for moving the sameint-o and out of the tube 43 to regulate the pressurey maintained .within duct 11. f o

1n order that the device may be actually set for operation at any desired pressure, a pointer or finger 50 is carried .by post 47 which cooperates with suitable graduations 51 on the exterior oftube43, as clearly de-V which are connected with the levers 58 and picted in lFigure 5. vAs will be obvious, as post' 47 is adjusted to vary the pressure at which motor 16 is actuated, pointer 50 is carried therebyV to the proper designation.

Mounted on the casing 32 is a panel boardl 59, an adjusting screw 62 being provided to vary the tension thereof, and arms 58 `and 59 are selectively movable to disengage the contacts carried thereby from vthe center contact 53 and to, should-theconditions lwithin the duct 11 warrant it, engage the contact carried thereby with the adjacent outer contact. V

This movement of the levers 58 and 59 is effected by arm 63 of bell crank lever 45, the the other end of which is normally disposed between adjustable stops 64 and 65 carried by levers '58 and 59 so that a loweringl movementv of the gasometer by'reason of a fall of the pressure fwithn the vconduit 11 below the desired degree willmove the bell crank arm 63 to the left with referenceto Figure 5 and disengage contact 56 'from contact 53 to thus run motor 16 at a slow speed `in the direction necessary to move valve member 13 towardl closed position and should the pressure be considerably 'below normal, the speed of the motor is increased by the continued fall of the float until contacts 54 and 56 engage. Y

In Figure 2 is illustrated a diagram of the circuits lemployed in connection with the contacts carried by the panel board 52y and in which the numeral 66designates the positive line and numeral 67 the negative having a shunt eld 68 connected thereacross and leading from the positive line to the center Contact 53 is a conductor 69 in which is positioned a limit switch 70, contacts 56 and 57 being connected with the armature ofthe motor by conductors 71 and 72, respectively. Connected across conductor 71 and negative line 67 is a conductor 73 having therein suitable resi-stance 74 from which leads, at an intermediate point, a conductor 75 which passes through a lamp 76 and is again connected with conductor 73. Connected across conductor 72 and negative line 67 is a conductor 77 having a suitable resistance 78 therein from which leads, at an intermediate point, a conductor 79 which passes through a lamp 8O and is connected with conductor 77. l/Vith this wiring, when the parts are in the position illustrated in Figures 2 and 5,*the motor circuit'is open at vcontacts 54 and 56, and 55 and 57, the armature 16 is dynamc ieally bralred `by 'reason of the shunt-field being energized and the armature beingshort circuited through the circuit established fromy the armature, through conductor 71, vcontacts 56, 53 and 57 and baclrto theother side of the armature throughconductor v72,1:and

lightsl 7 6 and 80 burn at full brilliancy by reason of the current flowing therethrough from the positive line-to the negative line',| as will'bereadily apparent. l i In the eventthe pressure within the" duct falls below the set degree and contacts 53 and',` 56 separate, as hereinbefore described, the motor is then slowly operated in the'direction to close valve 13 by reason of the currenty flowing from the positive line through contacts 53, 57, conductorl 72, through the armature of the motor, conductor 71, resistance 7 4 and to the negative line67 through conductor 7 3 as a resultoi which light 76 burns at half brilliancy and light 80 yremains vat lfull brilliancy. f l

As the gasometermoves, opening contacts 53 and 56 the motor does not come up to its low speed suddenly.v As the 'gasometer lever 63 tou'chesthe `screw 64 of lever 58r l` the motor starts at an extremely low' speed due to the slight relieving of the' pressure between the graphite 'contacts 53 and y56. i As the gasometer lever 63 presses harder against contact lever 58 the motor runs faster,- until the contacts are actually separated when the motor'is running at a 'uniform low speed. Between'O and low speed therefore the motorruns at as vspeed roughly propo'r-` y i tional to the change in pressure in the conduit which is'to be corrected. f v

However, a continued movement to thev left with reference lto Figure 5 of contact 56 until contact 56 engages `contact`54 will cause the motor speed vto increase by reason' of the resistance 74 being cut out'and the l current then ilowing through thel armature,l conductor 7l, contacts 56 and 54, and tothe negative line 67 ythroughl a conductor 81. v As the condition within the conduit approaches normal, the gasometer rises moving bell crank lever arm 63 to the right with reference to Figure 5 and consequently permitting corresponding-movement of contact 56 and as contacts 56 and 54 disengage, the resistance 74 is again cut in and the motor speed reduced and as the condition within the conduit again reaches normal, contacts 56 and 53 engage, dynamicallyl breaking the same as above described to eil'ect the abrupt arresting ofthe rotation thereof.

In the event the pressure within the conduit increases beyond the normal degree, the gasometer is raised, causing bell crank lever arm 63 to disengage contacts 53 and 57, as a result of which the current throughv the motor armature is reversed, being then from the positive li'ne through contacts 53 and 56,

conductor 7l, through vthe armature, conduct-or 72, resistance 7 8 and to the negative line67 through the conductor 77, lamp 8O being in parallel with the Vresistance burning at half brilliancy. Upon the continued movement to the right with reference to Figure 5 of the contact 57 under influence of the gasometer, an engagementof contact 57 with Contact 55 will cut out resistance 7 8 and increase the motor speed, the current flowing from the armature through conductor 72, contacts 57 and 55 and out to negaf tive line 67, through a conductor 82. As the pressure within the conduit falls, float 37 returns ywhen the operation of the motoris substantially the same as that when the movement of the float 37 reverses aftercon therein, a source or' power' connectable withv the motor toactuate the same and move the valve member, a gasometer controlled by pressure from the conduit, and means actu# ated by movement of the gasometer from a normal position by reason of a change in the conduit `pressure from apredetermined degree to connect-the motor with its source gas through the conduitl and consequentlyr the `pressureftherein, a motor for actuating the valve member and means for actuating the motor at a speed in proportion to .the change of pressure in the conduit to be corrected. f

3. A control of the character described comprising a gasometer, `motor controlling mechanism actuated by the gasometer, spring means for suspending the gasometer, and means for adjusting the tension ofthe spring means whereby the operation of the gasometer may bereadily regulated.

4L. A control -of'the character described comprising a gasometer, motor controlling mechanism actuated by the gasometer, spring means-for suspending the gasometer, means for adjusting the tension of the spring means whereby the operation of the gasometer may be readily regulated, and means i'or indicating the degree at which the control is regulatedto operate.

5. In a control of the character described, i

a gasometer, motor control means connected therewith and operable by actuation of the gasometer under a variance in pressure beyond a predetermined degree, means for adjusting the degree at `which the gasometer actuates the motor control, and means for indicating the pressure at which the `gasometer is set to actuate the motor control.

In testimony whereof I affix my signature.

i WILMER M. SHALLCROSS.

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