Refractory Fiber Products QC
Refractory fiber products can also be called ceramic fiber, is a fibrous insulation refractory, corrosion-resistant materials. Developed in 1941, it and fiber, can be used for paper, wire, rope, belt and other items.
Refractory fiber is divided into amorphous (glass) and polycrystalline (crystalline) two categories. Amorphous refractory fibers, including aluminum silicate, high purity aluminum silicate, chromium-containing silicate and high alumina refractory fibers. Polycrystalline refractory fibers, including mullite fibers, alumina fibers and zirconia fibers. (Table 1) also classified according to the maximum permissible temperature of refractory fibers.
Refractory fiber or good infrared radiation material, with good thermal capacity and infrared heating effect, the use of refractory fiber products can effectively save energy, is the ideal energy efficiency materials. Production practice has proved that the refractory fiber can be used in continuous heating furnace can save more than 15%, with intermittent industrial heating furnace can save more than 30%, while improving productivity and improve product quality, to achieve lightweight structure of the furnace, large , Comprehensive performance is good.
It is widely used in metallurgy, building materials, petroleum, chemical industry, shipbuilding, electric power, aerospace and so on because it has the advantages of insulation, silencing, anti-oxidation, oil resistance and water resistance.
Polycrystalline refractory fiber is the 20th century, the early 1970s following the development of amorphous refractory fiber after the new high-temperature insulation materials, mainly used in the working temperature higher than 1400 ℃ high temperature furnace, energy saving 25% to 40%. Polycrystalline refractory fiber can also be used as composite reinforcement material and catalyst carrier, the application effect is good. Polycrystalline refractory fiber can also be used in the field of aerospace missiles and atomic energy. Internationally industrial production and application of polycrystalline refractory fiber are mainly polycrystalline alumina fiber (Al2O380% ~ 90%, SiO221% ~ 20%), polycrystalline mullite fiber (Al2O372% ~ 79%, SiO221% ~ 28 %) And polycrystalline zirconia fibers (ZrO2 92%, Y2O38%).
Energy problems have aroused widespread concern around the world, on the one hand, energy consumption increased year by year,
On the other hand energy efficiency is still very low, in this contradiction in China was particularly prominent. China's thermal kiln energy efficiency is only 50% to 60% of developed countries, energy-saving materials research and development has become an urgent task facing the field of materials, refractory fiber because of its excellent thermal insulation properties and become energy-saving materials The development of hot spots.
Foreign polycrystalline refractory fiber research and development started earlier, the production technology has matured, the process is stable, comprehensive performance of fiber products, has been applied in many areas.
As the main varieties of polycrystalline refractory fiber, polycrystalline alumina fiber has excellent cost-effective and great commercial value. Since the 20th century, since the 1970s, many developed countries devoted a lot of effort to develop polycrystalline alumina fiber. To the British ICI company, for example, the company has more than 20 years of production of polycrystalline alumina fiber history, the production of polycrystalline fiber temperature up to 1600 ℃. Foreign polycrystalline refractory fiber is not only used as high temperature insulation materials, but also for high-grade ceramic, metal and plastic reinforced materials.
The refractory fiber has become the preferred material for refractory, heat preservation, heat insulation, sound insulation and fireproofing, which has replaced brick structure and castable with high temperature (1000 ~ 1400 ℃), vibration resistance, heat absorption, sound absorption and light weight. In metallurgy, petroleum, chemical, machinery, construction and other industries are widely used. The traditional refractory fiber construction technology mainly refers to the construction technology of refractory fiber products. The use of paste, stitching and other technologies and processes for construction, construction difficult, slow, difficult quality control, seams and more, poor overall, the operation of workers labor intensity, the environment is bad. Refractory fiber spraying technology is a new technology and technology of fiber construction mechanization. The technology is the use of fiber spray gun, the binder through the diaphragm pump evenly sprayed into the fiber, both in the gun outlet mixed spray directly to the work surface, the formation of three-dimensional network-like product structure. To overcome the shortcomings of the traditional construction technology, is conducive to improving the thermal efficiency of industrial furnace.
1. The ambient temperature during the construction of the lining shall not be lower than 5 ° C during the construction of the oven. The rainy season shall be carried out in the rainy season. All the holes and the burner holes of the heating furnace shall be sealed with cork or kraft paper.
2. Steel derusting standards should reach St3 level. Anchor nail welding root should be full of welding, no bite, vertical deviation ≤ 5mm, height error ± 2mm, spacing error ± 5mm.
3. According to the thickness of the spray lining layer of spray refractory fiber, hanging between the layers of stainless steel mesh, the lining should be completely covered anchor bolts, and the inner surface and anchoring nail should be the top (25 ~ 30) mm interval, spraying process is strictly prohibited Elastic material.