The main performance of the industrial kiln is mainly determined by the technical and economic performance of refractory materials, which directly affects the investment cost, work performance, thermal efficiency and energy consumption cost of operation of the furnace. The general principles for selecting refractory insulation materials such as insulation bricks.
1, Kiln performance and thermal characteristics. Such as intermittent work of the kiln should be selected for low heat capacity of the material.
2, Material safety use temperature, thermal conductivity system, high temperature strength, chemical stability.
3, Life of use.
4, Investment costs and maintenance costs of operation.
Generally speaking, heavy refractory materials focus on a technical performance indicators, such as high temperature stability, chemical stability, etc.; light insulation materials pay more attention to the input and operation of the comprehensive technical and economic indicators.
Selection of lightweight insulation bricks, is generally used to determine the thermal conductivity of insulation materials (λ) and the cost of each unit volume of insulation materials (Ρ), “λΡ” the smaller the product value, the better. The smaller the value of the thermal conductivity coefficient, it means that the thermal insulation of the insulation material is good, and the energy cost of operation is low. Low cost per unit volume of insulation material means low investment cost and good economic effect of investment. You can use the coordinate graphical method to make a graph to choose, the horizontal coordinate is the working temperature, the vertical coordinate is (λΡ) good product, with the safe use of the material temperature interception of the curve of each material, choose the technical and economic performance of the material.
Attachment: kiln insulation brick construction method
Insulation project is a meticulous work, the construction process to make every link to meet the quality requirements must be strictly focused on fine construction, diligent inspection. According to my construction experience, the following I talk about the construction methods in the kiln wall and kiln roof insulation work for your reference.
1, Thermal insulation brick masonry. Insulation wall height, thickness and total length must be in line with the provisions of the design drawings. Its masonry method and clay refractory bricks the same, with refractory mud masonry. Masonry should ensure that the ash full of slurry solid, its mortar fullness should reach 95% or more. When laying brick is strictly prohibited to use hammer knocking brick, the application of rubber hammer gently knocking the surface of the brick will be corrected. It is strictly forbidden to use the gray knife to cut the brick directly, the need to process the application of cutting machine to cut neatly. In order to avoid direct contact between the insulation brick and the open fire in the kiln, the observation hole around the available refractory brick masonry, insulation wall and insulation wool and the outer wall of the lap brick should also be clay refractory brick masonry.
2, Insulation cotton paving. Insulation cotton board order size should meet both the requirements of the design, but also to meet the practical needs of convenient installation. Installation process should pay attention to: cotton board must be in close contact with each other, try to reduce its joint gap, in the cotton board joints, the best high-temperature adhesive adhesion, so that it is sealed tightly to ensure its insulation effect.
In addition, the cotton board that needs to be processed, should be cut neatly with a knife, it is strictly prohibited to tear directly by hand.
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