Method for preventing fireproof material of rotary kiln from falling down

Abstract

The invention relates to the technical field of chain grate machine rotary kilns, and in particular relates to a method for preventing a fireproof material of a rotary kiln from falling down. According to the method, an annular fireproof material protection layer consisting of a prefabricated brick band arranged along an axial direction of the rotary kiln, a pouring band staggered from the prefabricated brick band and a kiln body anchoring nail is involved; a kiln head side and a kiln tail side of the inner surface of the annular fireproof material protection layer are low-temperature regions, and the middle of the annular fireproof material protection layer is a high-temperature region; and the prefabricated brick band is built by prefabricated bricks. The method is characterized by comprising the following steps of: arranging fiber paper in a working region around the prefabricated bricks, wherein the fiber paper is 100 to 120 mm high and 1 to 2 mm thick; arranging an expansion slit in the working region of the pouring band at every 1 to 2 m; arranging an expansion board in each expansion slit, wherein the expansion board is 100 to 120 mm high and 4 to 6 mm thick; and smearing two layers of asphalt on the surface of the kiln body anchoring nail, so that the expansion board is matched with the expansion slit. By the method, thermal stress caused by expansion inconsistency of the fireproof material and a steel structure is eliminated; and the fireproof material can be prevented from falling down.

Description

technical field [0001] The invention relates to the technical field of chain grate rotary kiln, in particular to a method for preventing the refractory material of the rotary kiln from falling off. Background technique [0002] In my country, the service life of the refractory in the chain grate rotary kiln is very short, mainly because the surface of the refractory will gradually peel off under high temperature conditions, and finally the kiln body steel plate will be exposed, resulting in the inability to produce. Due to the special structure of the rotary kiln, the refractory material is arranged along the axial direction of the rotary kiln, and consists of a prefabricated brick belt composed of a group of prefabricated bricks, and a pouring belt interlaced with the prefabricated brick belt. The pouring belt is provided with kiln body anchorage Nails, my country did not consider the problem of reserved expansion joints in the design and construction of rotary kiln refr...

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Problems solved by technology

However, in fact, the thermal expansion of the radial steel plate is lower than the high-temperature expansion of the refractory material, which will cause thermal stress due to expansion in the working layer of the refractory material. When the strength of the refractory material itself cannot overcome this thermal stress, it is relatively There will be mutual extrusion force between adjacent refractory materials, and the working layer of refractory materials will peel off; since the temperature distribution of the rotary kiln is high in the middle and low at both ends, this will cause the expansion of refractory materials in the high temperature area It is larger than the expansion of the steel plate, thus generating shear force in the radial direction and destroying the refractory material, which is the main reason why the refractory material in the high temperature section is easily damaged

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