refractory

Ceramic fiber, as a new refractory insulation material, has been one of the most popular insulation materials. It is mainly composed of SiO2 and Al2O3 and has high refractoriness over 1580℃.

The insulation mechanism of ceramic fiber can be explained in the following aspects:

(1) Poor heat transfer capability
Ceramic fiber is non-directional intertwined. Heat is transferred along the fiber, but the non-directional interleaving slows the heat transfer. Besides, when fiber is in contact with the hot face, it is seldom vertical contact. This makes it difficult for heat to transfer to fiber. When the contact points of the fiber reach 80%, heat transfer resistance gets higher. Since fiber itself is opaque, heat rays in the fiber cannot pass. And the area of fiber is small, so it receives less radiation and heat radiation is basically not transmitted in the fiber.

(2) Poor convective heat transfer capability
When fibers are intertwined together, a lot of gas chambers are formed. Those gas chambers are filled with still air. Air has poor heat transfer capability and prevents the invasion of hot air flow.

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A brick kiln is a type of tunnel kiln where wet bricks made of gangue and shale are fired into finished bricks. It is usually more than 140m long and 2.8m, 3.3m, 4.6m, 6.9m or 9.2m wide, according to the size of the kiln.

With the development of the brick and tile industry, tunnel kilns are widely used. Issues such as the ends, firing quality and energy consumption of the kiln are gradually emerging. The dome of the traditional dome tunnel kiln is built with T-shaped refractory bricks. Since refractory bricks have poor thermal shock resistance, there are always slitting and spalling problems. In addition, the horizontal thrust of the dome kiln is large, so the wall requires special reinforcement. This consumes a lot of materials and time.

Because the upper space is large and the temperature difference is great, this greatly affects the quality of products and increases coal consumption. In the recent decade, the tunnel kiln begins to be flat-topped. Initially, the flat top is built with refractory cement blocks and refractory concrete. But since these materials have poor thermal shock resistance, the service life is just 2 years, so it greatly increases the غير مجاز مي باشدt.

Ceramic fiber is made of alumina powder. The powder is melt at 2000℃ and then spun and blown into fiber. It has high purity, good thermal shock resistance and good acid and alkali resistance. Its service life can reach up to 10 years. It is easy and safe to install. It is only 1/20 of refractory bricks and has good energy saving performance.