- Time:Jul 23, 2022
Clay thermal insulation bricks belong to lightweight refractory bricks, lightweight refractory materials and thermal insulation materials. The standard size is 230*114*65mm, the bulk density is 0.75-1.20g/cm3, the compressive strength of the light clay brick is 2.0-5.9mpa, and the thermal conductivity is 0.221-0.442w/(m.k) (1350℃). Compared with ordinary refractory bricks, light-duty thermal insulation refractory bricks are lighter in weight, and are covered with uniform small pores and high porosity. This ensures that less heat is dissipated from the furnace walls, with a corresponding reduction in fuel costs, and the lighter bricks also mean less heat storage, so both heating and cooling are faster, allowing for accelerated cycle operations. Lightweight thermal insulation refractory bricks are suitable for temperatures between 900°C and 1650°C.
characteristic
A: Low thermal conductivity, good thermal insulation effect;
B: Low thermal melting, due to low thermal conductivity, the heat energy stored by mullite series lightweight insulating bricks is very small, and the energy saving effect is obvious in intermittent operation;
C: The impurity content is low, and the content of oxides such as alkali metals in the iron box is extremely low, so the fire resistance is high; the higher aluminum content can still maintain good performance in a reducing atmosphere;
D: high thermal compressive strength;
E: Accurate appearance size, speed up the masonry, reduce the use of refractory mud, ensure the strength and stability of the masonry, thereby prolonging the life of the masonry;
F: can be processed into special shapes. Reduce the number of blocks and reduce the joints.
Manufacturing process
The commonly used production process of sticky insulation bricks is the additive method, and the foam plastic method can also be used.
Adhesive insulation bricks have a wide range of applications, and are mostly used for thermal equipment and industrial kiln insulation. They can be used in parts that are not eroded and scoured by strong high-temperature molten materials. In some places, refractory coatings can be used to cover the surface that is in direct contact with the flame. , reduce the scouring of slag and soot, reduce the damage to the product, and the working temperature of the product will not exceed the test temperature of the reburning line change. Ceramic clay insulation bricks belong to porous lightweight insulation materials. The porosity of the material is 30% to 50%, and the thermal insulation performance is poor, but the mechanical strength and corrosion resistance are good.
Light clay insulation brick, its performance is very strong. But if the application is unreasonable, no matter how good the product is, there is no place for it. Therefore, how to make lightweight clay bricks in industrial kilns
Does the furnace play a better role in thermal insulation when working?
Light clay bricks use clay clinker or light clay clinker as the main raw material, which is usually produced by the method of flammable materials, and can also be formed into a porous structure by chemical method or foam method. The raw materials are mixed with water to make plastic clay or mud, which is extruded or cast, dried and fired in an oxidizing atmosphere at 1250-1350°C. The bulk density of ordinary lightweight clay bricks is between 0.75~1.2g/cm3.
Lightweight clay bricks are favored by most industrial kiln manufacturers because of their excellent performance and low price. As long as the places that do not directly touch the flame need to be insulated, they are basically replaced by lightweight clay bricks. Therefore, what are the advantages and disadvantages of lightweight clay bricks? The heat storage loss of industrial kiln masonry and the heat dissipation loss of furnace body surface are generally about 24~45% of fuel consumption. Use lightweight clay bricks with low thermal conductivity and low heat capacity. Bricks are used as the structural material of the furnace body, which can save fuel; at the same time, because the furnace can heat up and cool rapidly, it can improve the production efficiency of the equipment; it can also reduce the weight of the furnace body, simplify the structure of the furnace, improve product quality, reduce ambient temperature, improve working conditions.
However, the lightweight refractory bricks have large porosity and loose organization, so they cannot be used for parts that directly contact slag and liquid metal; they have low mechanical strength and cannot be used in load-bearing structures; they have poor wear resistance, and are not suitable for contact with furnace materials, resulting in serious wear. Light clay bricks can only play a large thermal insulation role within the high heat-resistant temperature range it allows.
The general lining part in the kiln is often in direct contact with the flame and slag, which is only suitable for heavy bricks. Light clay bricks are mainly used in thermal equipment and thermal insulation layers of industrial kilns. They are not eroded by strong high-temperature molten materials and are not subject to scouring. Losses due to erosion of slag and soot. In a non-melting furnace, there is of course no contact with the flame. Kilns below the upper temperature limit of light clay bricks can all be built with light clay bricks.
