11/12/2018

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RECENT INNOVATIONS IN

COKE OVENS &COAL CHEMICALS

M M THAKUR & N P MISHRAM M THAKUR & N P MISHRA

Modification in D. E. Car Door Locking and Unlocking at Coke Oven Battery

Secondary Protection To avoid wrong charging at CDCP.charging at CDCP.

11/12/2018

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DETAILS OF DOOR EXTRACTER MECHANISM

Modification in D. E. Car Door Locking and Modification in D. E. Car Door Locking and UnlockingUnlocking

Snatching Hook and Fork

4Buffer Roller Snatching gear box

11/12/2018

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The snatching, lowering and home position of DE Car Door

Extractor used rotary limit switch since inception.

Modification in D. E. Car Door Locking and Modification in D. E. Car Door Locking and UnlockingUnlocking

When the rotary position is disturbed, it is tough to adjust,

then bypassed the interlock for continuous production.

Due to this bypass operation, there is no restriction on is no restriction on

snatching and lowering operation.

This leads to gear box failure and bend the upper ceiling

strip of door.BEFORE MODIFICATION

ROTARY LIMIT SWITCH

Modification in D. E. Car Door Locking and Modification in D. E. Car Door Locking and UnlockingUnlocking

The rotary limit switch isreplaced by a magnetic switch .

Switch Location is also changed

It is easy to adjust the limit.

It leads to complete withdrawalof bypass operation of D E Car

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MAGNET LIMIT SWITCH

AFTER MODIFICATION

of bypass operation of D E Car.

11/12/2018

4

Secondary Protection To avoid wrong charging at CDCP.

Proximity switches areinstalled in charging deviceto ensure charging lid up,down, door open andhopper on hole position

Secondary Protection To avoid wrong charging at CDCP.

hopper on hole position.

After lifting hot coke bucket,it moves horizontallytowards chamber andmoves down on fixedhopper to charge hot coke.

Sometimes wrong chargingof hot coke on the charginglid, instead of chamber leadto breakdown in coke drycooling plant .

BEFORE MODIFICATION

11/12/2018

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Secondary Protection To avoid wrong charging at CDCP.

To Provide “Secondary Protectionfor Hot Coke Charging”. Lifterwith Bucket will travel in AUTOmode as per normal ChargingSequence, and will wait for Second

d b hq

Command by Charging DeviceOperator to complete the Hot CokeCharging process.

Operator will ensure the CokeLevel at Chamber, ChamberCharging Lid Up, Movable Hopperon Hole and Charging Device DoorOpen physically before givingCommand through “SPDT”

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Before Modification Bucket Charging was controlled by “Proximity Switch” indication, which malfunctioned sometimes

AFTER MODIFICATION

gSwitch.

Then the Lifter will complete theNormal Charging Sequence inAUTO Mode.