The service life of an industrial kiln is mainly determined by the service life of the refractory lining. The lining is composed of refractory bricks, refractory castables and lightweight insulation bricks. The economic performance of the masonry directly affects the investment cost, work performance, thermal efficiency, energy consumption cost of operation, etc. Therefore, how to choose lightweight insulation bricks, what are the specific requirements. The basic requirements for choosing lightweight insulation bricks are:
(1) Performance and thermal characteristics of the kiln. For furnaces that work intermittently, materials with low heat capacity should be used.
(2) The safe use temperature of materials, thermal conductivity system, high temperature strength, and chemical stability.
(3) Life expectancy.
(4) Investment costs and maintenance costs of operations.
The refractory bricks for masonry are divided into heavy refractory bricks and light refractory bricks (lightweight thermal insulation bricks). Heavy refractory bricks focus on high temperature stability, chemical stability, etc.; lightweight insulation bricks focus on thermal insulation and economy. When lightweight insulation bricks are used, the refractory sheets with small thermal conductivity value, small bulk density or high porosity have a small volume density, indicating that the insulation material has good heat insulation effect and low energy cost during operation.
Lightweight insulation brick construction method
The masonry of lightweight insulation bricks is a meticulous project. In order to meet the quality requirements in every aspect of the construction process, it is necessary to strictly pay attention to fine construction and diligent inspection. The following is a description of the relevant construction methods for the kiln wall and kiln roof insulation working layer for reference.
(1) Insulation brick masonry. The height, thickness and total length of the insulation wall must comply with the design drawings. The masonry method is the same as that of clay refractory bricks, and is built with refractory mud. The masonry should ensure that the ash is full and the mortar should be more than 95% full. It is strictly forbidden to use a hammer to knock bricks when laying bricks. Use a rubber hammer to gently tap the surface of the brick to correct it. It is strictly forbidden to cut bricks directly with a gray knife, and the cutting machine that needs processing is cut neatly. In order to avoid the direct contact of the thermal insulation brick with the open flame in the kiln, the surrounding of the observation hole can be built with refractory bricks, and the reinforced bricks of the thermal insulation wall and the thermal insulation cotton and the outer wall are also constructed with clay refractory bricks.
(2) Insulation cotton paving. The size of the insulating cotton board must meet the design requirements and meet the practical needs of convenient installation. During the installation process, it should be noted that the cotton sheets must be in close contact with each other, and the joint gap should be minimized. At the joint of the cotton board, it is better to stick with a high-temperature adhesive to make the seal tight and ensure the heat preservation effect. For the cotton board to be processed, the cutting tool should be cut neatly, and it is strictly forbidden to tear directly by hand.
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