The new technology of multi-layer composite furnace lining has been promoted and applied
The use of multi-layer composite furnace lining can obtain the best combination of thermal efficiency and low cost, and the economic benefits are remarkable, which makes this new technology popularized and applied. Selection of refractory fiber cotton and binders Selection of refractory fiber cotton Fiber wool for lining of refractory fiber spray furnace should be made of fiber cotton produced by injection method. The selection of refractory cotton is mainly based on the use temperature. The length of the fiber should not exceed 20, and the foreign inclusions such as high-iron and high-calcium should not be mixed in the fiber cotton. The amount of other cotton seeds mixed in the same fiber cotton should not exceed the mass concentration of the refractory fiber cotton before the spraying. The quaternary ammonium salt type cationic surfactant is pretreated. The types and performance parameters of domestic refractory fiber cotton are shown in the table. The types and performance parameters of domestic refractory fiber cotton. The fiber diameter of fiber cotton type. The binder used in domestic refractory fiber spraying technology is mostly composed of sol silicate phosphate metal chloride kaolin. Or a bentonite additive and water. The value of the prepared binder is a relative density so that the fibers have good mechanical bonding and physical and chemical bonding to avoid large area shedding between the fiber layers and between the fiber layer and the shell steel sheet due to poor bonding. It should have high enough room temperature bond strength and high temperature bond strength, and its normal temperature bond strength is not lower than the bond strength after drying or sintering. The bond should be bonded with the refractory fiber cotton. Have the same or similar physicochemical properties and use temperature, and should have good fluidity, invasive diffusivity and permeability, but should not be corrosive. The anchors are welded or shaped metal anchors on the shell steel plate at a spacing less than the total thickness of the refractory fiber lining to ensure that the ends are buried in the lining to avoid the formation of thermal bridges. The material of the anchor should be selected according to the temperature corrosion and strength. If necessary, high alumina ceramic anchors can be used. The pre-coating is applied or sprayed on the shell steel plate and the metal anchor with a thin layer of undiluted binder. As a pre-coating, the room temperature bonding strength is not lower than the thickness of the first layer of the sprayed refractory fiber layer. The thickness of each layer to be sprayed after 20th shall be controlled at 30, but the total thickness of the lining shall not exceed the refractory fiber used in each layer. According to the requirements of the use temperature, the aluminum fiber cotton and high alumina fiber cotton may be used separately. One of the mis-fiber cotton and the crystal fiber cotton, the viscosity of the binder in each layer (adjustable by dilution with water) is reduced layer by layer, and the amount of the binder is reduced layer by layer. (Finish)
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