Although the water absorption capacity of ceramic fiber insulation blanket is very small, it is important to control the relative humidity of the workshop due to its large specific surface area. When fibers rub against other solid materials in textile processing, static electricity is generated. The static electricity generated by ceramic fiber insulation blankets is more prominent than that of natural fibers and organic fibers. Because electrostatic charges repel each other, the fibers in the yarn can often be loosened, and production cannot proceed normally in severe cases. Therefore, the air is usually kept at the corresponding relative humidity to help remove static electricity. At the same time, the mixture should be added to the electrostatic agent.
What will happen to the ceramic fiber insulation blanket during sintering?
1. Before sintering: in this process, the temperature control is key, with the temperature rise, the ceramic fiber insulation blanket body shrinkage, but the density and intensity of the change is not large, the microstructure of the grain proportion has not changed, this stage of the body is easy to split, due to the moisture and binder is removed, so pay attention to the heating rate.
2. Early sintering: when the temperature has a small change, its volume is reduced, the density will have a big change, although the microstructure of the grain proportion is still no significant change, but the particles are no longer the point thick, the porosity is also reduced, this stage of the body due to sintering volume reduction, it is easy to produce the body split and shape.
3. Late sintering: the temperature rises, all the changes are deeper than the previous step, but the change in density and intensity of the ceramic fiber insulation mat is almost no longer convenient, the grain proportion of the microstructure changes significantly, the pores become smaller, and are not connected to each other, forming isolated pores, some pores remain in the grain.
The ceramic fiber insulation blanket overcomes the shortcomings of using light fireproof brick as the inner liner of the burner area of the heating cover of the furnace, no cracks are found, the temperature of the outer surface of the heating cover maintains the designed temperature, the production is normal, the mixed flow sheet is not deformed and the combustion is normal.
1. Reduce the repair time, improve the production capacity of the later introduction of 36 all-hydrogen cover furnace, 19 heating covers, heating cover repair once need to stop production for 5 days, the production capacity of heating cover per hour is 3.5 tons, and the use of polycrystalline mullite fiber composite products genuine molding block, instead of light fire brick as the furnace cover burner area lining. The annual production capacity can be increased by 7980 tons. According to production statistics, reducing the number of replacement or repair burners can increase the production capacity of 6,384 tons, and the two items can produce 14,364 tons more cold rolled plate.
2. Energy saving calculation, using polycrystalline mullite fiber composite products, ceramic fiber insulation blanket vacuum forming block as heating cover burner area, furnace lining instead of light refractory brick as heating cover burner area lining, instead of light refractory brick as heating cover burner area lining.
Ceramic fiber insulation blanket is a kind of good insulation equipment, in the long-term use, the equipment may have some small problems, such as cracks in the product, next I will give you an analysis of the reasons.
1. Caused by too fine fiber fineness modulus and too high mud content;
2. Ceramic fiber insulation blanket mortar water absorption is too high, winter frost heaving caused cracks;
3. Ceramic fiber insulation blanket products mixed uneven, due to inconsistent shrinkage stress;
4. The proportion of cement is too large, the label is too high, resulting in the early shrinkage of ceramic fiber insulation blanket too fast;
5. The flexibility index is not enough, the elongation is small, so that the deformation resistance of ceramic fiber products is reduced.
