Aluminosilicate refractory fiber as insulation material for heating furnace
According to the heat dissipation formula, the heat loss of the furnace body is mainly determined by the heat dissipation area of ​​the furnace body and the heat flow value of the heat dissipation surface. For a rolling furnace, the furnace heat dissipation area is constant. Then the heat flow value of the furnace heat dissipation surface determines the size of the furnace heat loss. The change of the heat flow value depends on the thickness of the furnace wall and the thermal conductivity of the refractory material at the average temperature. Thus, when the refractory material is selected, the thicker the wall thickness, the smaller the heat flow value of the furnace wall, the smaller the heat dissipation. When the thickness of the furnace wall is constant, the smaller the thermal conductivity of the refractory material, the smaller the heat flow value, and the less the heat dissipation.
In summary, the ways to reduce the heat loss of the furnace body are as follows: (1) The thickness of the furnace wall is properly selected: that is, the thicker the furnace wall, the smaller the heat dissipation. (2) The choice of multi-layer furnace wall multi-level thermal insulation furnace design is the best way to reduce the heat loss of the furnace body.
Although the thermal conductivity and the bulk density of the expanded perlite and the vermiculite are comparable to those of the fire-resistant fiber at room temperature, they are granular, and the heat-insulating filler is preferable. If the laying of masonry is large, it is necessary to add additives as a product before it can be used, but there will be disadvantages of increasing bulk density and thermal conductivity. Stone products also have this feature. In addition, the above two kinds of products have large particles, the products are metallurgical and energy-cracked, and they are easy to break down. The construction is not as easy as laying fibers. Asbestos, slag wool, and glass wool products have good heat insulation properties, but crude fibers break easily. Microfibre is easy to fly, construction and overhaul have stinging skin and other shortcomings. In summary, the aluminosilicate refractory fiber is used as the heat insulation material of the heating furnace and is the best insulation material in terms of thermal insulation performance, thermal performance and construction.
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