Cock Oven Furnace Door Brick

Coke oven doors are auxiliary equipment for opening and closing the two ends of the coke oven carbonization chamber. When closed, they isolate the carbonization chamber from the atmosphere, and when opened, they allow the coke pusher to push out coke. They are divided into machine-side doors (small doors with coal leveling rods passing through) and coke-side doors. Their structure includes components such as shell, lining bricks, knife edge, and cross iron. Modern coke ovens mostly use self-sealing knife edge doors, which achieve a seal by pressing the knife edge tightly against the door frame with springs or bolts.

Coke oven doors are auxiliary equipment for opening and closing the two ends of the coke oven carbonization chamber. When the door is closed, the carbonization chamber is isolated from the atmosphere, and when opened, the coke pusher can push out coke. Coke oven doors are divided into machine-side doors and coke-side doors. The upper end of the machine-side door is equipped with a small door for the coal leveling rod to extend into the carbonization chamber for leveling coal.

Coke Oven Door Structure

The door consists of a shell, lining bricks, knife edge, cross iron, and other components [2]. Modern coke ovens mostly employ self-sealing knife-edge doors, where a knife edge made of flat steel presses tightly against the machined surface of the door frame, isolating the carbonization chamber from the atmosphere. When the door is locked with a spring latch, the total pressure of the knife edge on the door frame depends on the spring force. When the door is tightened with horizontal bolts, this total pressure depends on the torque of the bolt tightening device. The uniformity of the pressure of the knife edge on the door frame is adjusted by a clamping device installed around the knife edge. A widely used method is to hammer the knife edge; by hammering the fixing clips, a tight contact between the knife edge and the door frame is achieved. To reduce heat loss from the carbonization chamber, the side of the door facing the carbonization chamber is lined with refractory bricks, with insulating material filling the space between the lining and the outer shell.

Coke ovens are complex industrial kilns with a service life generally exceeding 30 years. Compared to the long service life of coke ovens, the service life of the inner lining material of the door is shorter due to long-term exposure to thermal shock, chemical corrosion, and mechanical damage. Traditional coke oven door linings typically employ a method of fixing small bricks in brick grooves, resulting in severe carbon buildup, seepage cracking, breakage, high maintenance requirements, poor insulation performance, short service life, and gas leakage causing environmental pollution.

Our company has conducted comprehensive research on coke oven door lining materials, focusing on structural design, assembly technology, anti-carbon buildup treatment, quick maintenance technology, and coating material development. We have developed a new type of composite precast brick for coke oven doors that is long-lasting, energy-saving, environmentally friendly, and quick to install. This solves technical challenges such as high ambient temperatures, gas leakage, smoke and dust emissions, and difficulties in cleaning and maintaining carbon deposits.

The new composite precast coke oven door brick is refined from high-quality refractory composite materials with special additives. It features low porosity, high strength, good toughness, low expansion rate, and good thermal shock stability. The structural design utilizes the latest nano-insulation composite structure, resulting in significant energy savings. The application practice of the long-life, energy-saving and environmentally friendly new coke oven door shows that it has significant advantages over traditional oven doors in terms of increasing coke oven output, improving thermal efficiency, quick installation and maintenance, and improving the working environment, with a lifespan of more than 5 years.