Labor Saving Steel Belt Kiln Direct Heating For Firing Blue Bricks / Tiles

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A tunnel kiln consists of a long, straight tunnel with fixed walls and a roof, featuring tracks at the bottom for kiln cars. The combustion units are situated in the middle, forming a high-temperature firing zone. The combustion gases flow towards the kiln's entrance under the chimney or fan's influence, gradually preheating the incoming materials, thus forming the preheating zone. At the tunnel's end, cold air is blown in to cool the finished products. This heated air is then reused in the dryer for drying green bodies, forming the cooling zone.

Kiln cars, loaded with clay bodies, are pushed from the preheating zone's entrance, while those with fired products exit from the cooling zone's exit.

Advantages of Tunnel Kiln:

1. Continuous production with short cycles, high output, and superior quality.
2. High thermal efficiency and economical fuel usage, utilizing counterflow principles for heat retention and residual heat reuse, saving 50-60% of fuel.
3. Shorter firing duration, approximately 20 hours compared to 3-5 days for traditional kilns.
4. Labor-saving: Simple operation with external loading/unloading reduces labor effort and improves working conditions.
5. Higher quality: Stable temperatures in the preheating, firing, and cooling zones make process control easier, leading to better quality and lower breakage rates.
6. Long-lasting: The kiln's resistance to rapid temperature changes extends its service life to 5-7 years before requiring repairs.

However, the construction of tunnel kilns demands more materials and equipment, resulting in higher initial investment. Since it is a continuous kiln, changing the firing regime is challenging, making it ideal for large-scale production with similar firing needs.

Tunnel kilns are used for firing blue bricks and tiles, ceramics, and new energy materials, with structures that can be built or assembled with steel.