Coke Oven · Doors
The coke oven door (door brick channel) seals the carbonization chamber and serves coal charging and coke pushing. Door bricks long-term bear high temperature, mechanical collision and rapid heating/cooling. Door-channel damage causes poor sealing and gas leakage—a high-frequency oven issue.
Mechanical collision: charging cars, pushers and door operations collide with the door brick channel. Rapid heating/cooling: doors repeatedly contact high temperature and cold air in the charge-push cycle, thermally cracking. Wear: door opening/closing and brick-channel friction wear the bricks. High-temperature aging: door-zone temperature is high; bricks age under long-term high temperature.
After damage, door sealing fails with smoke and gas leakage, raising pollution and heat loss; frequent door maintenance hurts charging/pushing operations and burdens oven work.
Select door brick channels for "high thermal-shock resistance + collision resistance":
Precise assembly: assemble special-shaped bricks by number with joints ≤2mm. Locking: lock bricks against loosening. Bake-out: follow the curve to avoid residual moisture in mortar.
Standardize door operations to reduce collision impact; inspect door channels and sealing regularly, replacing cracked bricks promptly. At maintenance, check channel-frame fit to keep doors well sealed.
High-alumina brick LZ-55 (Al₂O₃≥55%) with refractoriness ≥1770℃ offers dense structure, wear resistance against gas scouring and combined cold/hot strength—one of the most widely used shaped refractories.
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Mullite brick with mullite as the main phase (Al₂O₃≥75%, refractoriness ≥1850℃, RUL ≥1650℃) offers high-temperature volume stability with excellent thermal-shock and creep resistance.
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