Tunnel Type Furnaces

Tunnel-type furnaces are the most widely used and most efficient type of industrial furnace for refractory firing processes. Thanks to their continuous operation principle, they provide high production capacity and maximize energy efficiency through the recovery of hot gases between zones. Furnaces have a tunnel structure ranging from 30 to 200 meters in length.

Products move continuously through the tunnel on refractory wagons (kiln cars). Along the tunnel line, there are four main temperature-controlled zones:

• Drying Zone (sometimes in a separate furnace)
• Pre-heating Zone
• Firing (High Temperature) Zone
• Cooling Zone

Application Area:

Preferred in industrial facilities with continuous production and high capacity.

Batch (Chamber) Type Furnaces

Chamber-type furnaces are compact and flexible firing systems operating on a batch (periodic) principle. They are particularly preferred for firing specially designed refractory products, small-batch production runs, or laboratory-scale R&D processes.

These furnaces are designed in the form of a closed room (chamber). The kiln car carrying the products to be fired is moved into the chamber, and after the door is closed, the firing cycle is started. Products are heated according to the defined temperature curve; after the sintering process is completed, the furnace is cooled in a controlled manner and the products are removed.

Each firing cycle can be programmed individually depending on the type of material and the target sintering temperature.

Application Area:

Chamber-type furnaces offer safe and controlled firing with flexible temperature profiles and atmosphere conditions tailored to different product types, making them ideal for small-scale producers, R&D laboratories, and specialty product manufacturers.