A method for spraying insulating coatings by a wet method on carbon element calcining kiln large-scale kiln walls

Abstract

The invention relates to a method of wet injecting for insulation layer of large kiln wall in carbon baking kiln, which effectively solves the making of insulation layer of large kiln wall in carbon baking kiln, improves insulation effect and prolongs the service life. The method is divided into the following steps: fireproof fiber, pearlite, vermiculite, alumina clinker powder, black soil powder and soft clay powder are mixed together first and next sodium silicate and water are added to the mixture and the mixture is stirred into pulp; then the wet pulp is broken up and injected by an injector to an external wall of the working surface of a kiln liner and a whole and large seamless insulation layer is formed after the pulp is dried. The injecting comprises that anchor nails are fixed in slant or straight line in the external wall, a net is arranged between the anchor nails; standard points with appropriate thickness are arranged; and then the pulp is injected to the external wall of the kiln liner layer by layer. The method is simple, has wide sources of raw materials, low cost, good effect and long service life and effectively solves the technical problems of deformation caused by seams in the insulation layer, bad insulation performance and short service life.

Description

1. Technical field [0001] The invention relates to a method for wet-spraying an insulating layer on a large-scale kiln wall of a carbon roasting kiln. 2. Background technology [0002] The quality of the large kiln wall of carbon roasting kiln not only directly affects the service life of the roasting kiln, but also affects the quality of roasted products, roasting efficiency and energy costs. At present, the insulation layer of large kiln walls is usually composed of fiber sticky blocks. There are many joints between the blocks, and the overall performance is poor. In use, especially at high temperatures, the insulation wall is prone to cracks and deformation, which greatly reduces the insulation performance. The roasting time is long, the production efficiency is low, the product quality is poor, and the service life Short, therefore, how to construct the insulation layer of large kiln walls is a technical problem that must be solved. 3. Contents of the invention [000...

AI Technical Summary

Problems solved by technology

[0003] In view of the above situation, the object of the present invention is to provide a method of wet-spraying the thermal insulation layer on the large kiln wall of the carbon roasting kiln, which can effectively solve the problems of making the thermal insulation layer of the large kiln wall of the carbon roasting kiln and improving the thermal insulation effect and service life , using refractory fiber, perlite, vermiculite, bauxite clinker powder, black wool soil powder and soft clay powder mixed together, then adding water glass and water to mix into a slurry, and then using the wet method of hydraulic conveying The spray machine disperses the wet slurry and sprays it directly onto the outer wall of the kiln (or furnace) lining working surface, and forms a seamless large-scale insulation layer after drying. First fix the anchor nails, place them in oblique lines or straight lines, and install pull-nets on each other on the anchor nails, and place appropriate thickness standard points, and then spray the slurry on the outer wall of the kiln lining in layers with a wet spraying machine On the other hand, after coagulation and drying, it will become an integral thermal insulation layer. Therefore, the technical solution of the present invention is, at first, by weight percentage: refractory fiber 20-50%, perlite 15-25%, vermiculite 15- 25%, bauxite clinker powder 5-15%, black wool soil powder 5-15% and soft clay powder 2-5% are mixed together to form a mixture, and then add 5-15% of the weight of the above mixture of water The glass and 5-10% of the weight of the mixture are mixed into a slurry-like wet slurry, and then the prepared wet slurry is dispersed by a hydraulically conveyed wet jet machine and sprayed directly outside the working surface of the roasting kiln lining On the wall, after drying and solidifying, a seamless large-scale thermal insulation unit is formed. The spraying steps are as follows: firstly, clean and smooth the construction surface of the outer wall of the baking furnace lining working surface, and then fix the anchor nails on the construction surface according to the sprayed thickness. , the anchor nails are arranged in a straight line or oblique line, and the anchor nails are equipped with pull-out nets between each other, and an appropriate amount of spray thickness standard points are placed, and then the wet slurry is dispersed with a wet spray gun, and then sprayed directly to the construction site in layers On the surface, when spraying the first layer, first spray the bonding agent once, and when the bonding agent dries quickly, then spray 25-35mm thick wet slurry, and then according to the design thickness requirements, gradually double the thickness of each layer. Spray in layers until the design thickness requirements are reached. When spraying the latter layer, the sprayed slurry in the first few layers must not harden, otherwise it must be removed and sprayed again to prevent the ability to combine the inside and the outside. When it reaches When the thickness is required by the design, smooth it manually or with a smoothing machine from top to bottom and from left to right. The sprayed wet slurry will have a coagulation degree of more than 80% in 24 hours. After it is completely solidified and dried, it will become a whole without joints. Seam insulation layer, the thermal conductivity of the insulation layer is 0.15-0.08w / m k at a surface temperature of 800°C; the compressive strength of the insulation layer is 5-10MPa when the insulation layer is compressed by 25%, and the insulation layer is heated at 1150°C for 3 hours The shrinkage rate is 0.2-0.6%, and the bulk density of the insulation layer is 0.5-0.8kg / cm 3 , the method of the invention is simple, the raw materials are abundant, the cost is low, the effect is good, and the service life is long, which effectively solves the technical problems of deformation of the kiln body caused by cracks in the insulation layer, poor thermal insulation performance and short service life, and the economic and social benefits are huge.