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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.

Henan Ruiyao Intelligent Environmental Protection Co., Ltd. is a branch of Suixian Yaxin Intelligent Technology and Environmental Protection Co., Ltd. and has a friendly cooperative relationship with Henan Yaxin Kiln Co., Ltd. The qualifications and honors of the two companies can be shared by Henan Ruiyao Intelligent Environmental Protection Co., Ltd.

Henan Ruiyao Intelligent Environmental Protection Co., Ltd. is a high-tech enterprise. We are a professional company that provides kiln design, development, construction, installation and commissioning services. We have strong technical strength and take "quality first, integrity first" as our purpose. We have won the unanimous recognition and praise of dense furnace experts and customers.

The company's business covers more than 20 provinces, cities, and autonomous regions across the country and has gone abroad to serve the world. We keep pace with the times with a high sense of responsibility, pioneering and innovating, and independently developed a batch of high-efficiency and energy-saving dense furnaces, which are suitable for kilns in various industries such as building materials, daily ceramics, refractory materials, casting, powder metallurgy, powder sintering, and new materials. Such as high-efficiency energy-saving tunnel kilns, roller kilns, shuttle kilns, rotary kilns, mesh belt kilns and other kilns and accessories. In recent years, the energy-saving effect of the high-efficiency energy-saving kilns we have developed has reached more than 40%, with advantages such as high energy saving, long life, high output and good quality.

"Development through quality" is the development goal of our company. Years of practice have proved that only by continuous innovation and scientific development can we meet the needs of users. We will use high-quality products and sincere services to ensure long-lasting friendship and win-win cooperation between the supply and demand parties, and contribute to the development of the kiln industry.