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

2. Lower Oven 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 Oven 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.