THE YEAR-BOOK OF THE COKE OVEN - Coke Oven Managers ...

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2. Lower <strong>Oven</strong> DoorsAs stated above damage and melting down of upper oven doors causedextensive damage of lower oven doors also. The molten iron falling on therefractory lining of lower oven door first damaged the refractory, whichgave way, exposing the lower door metal to direct heat. The ribs of lowerdoor melted down. Thus a large number of lower doors also got heavilydamaged and became unserviceable. The first replacement activity ofLower <strong>Oven</strong> Doors was started in March 2008.Refractory lining work for lower oven doors in progress in COP3 Bridge PipesBridge pipes are breather pipes for ovens and serve as nostrils for the ovenchambers. Each oven therefore has two bridge pipes connected to twoseparate branch headers – one at pusher side and the other at coke side.These create the necessary suction inside the oven uniformly from bothends for inhaling combustion air into the free space above the coal cake.The inhaled air helps burning of volatile substances given out of the coalcake and creating a fireball which radiates heat in all directions. The archedoven roof serves as a concave mirror and reflects the radiations in parallelvertical rays falling on the coal cake.
External view of a damaged bridge pipe at COP in BPSLEntry of air into the oven should be so controlled that 80% of thecombustion is completed in the oven top free space below the arch roof andrest of the unburned gas along with the hot burnt flue gas travels down tothe sole flue which is divided into four linked arches below the oven sole.Secondary combustion air is introduced in the sole flue to complete thebalance 20% combustion and the hot inert flue gas devoid of anycombustible constituent is allowed to go up the uptakes to the bridge pipes,the branch header and finally to the chimney via the waste heat boiler forrecovery of waste heat from the hot flue gases for generation of power.Internal view of a damaged bridge pipe at COP in BPSL
Page 1 and 2: Damage Control of Bridge Pipes, Upp
Page 3: The History of Damages1. Upper Oven
Page 7 and 8: DamageGood ConditionDamageGood Cond
Page 9 and 10: DamageGoodConditionDamageGoodCondit

THE YEAR-BOOK OF THE COKE OVEN - Coke Oven Managers ...

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