Why do some high temperature kilns need to use lightweight firebricks, and some do not?

Why do some high temperature kilns need to use lightweight firebricks, and some do not?

The choice of whether to use lightweight firebricks in high temperature kilns depends on a number of factors, including process requirements, material properties, thermal properties, etc. Here are some possible reasons:

Thermal shock resistance: The thermal shock resistance of lightweight firebrick is better, that is, when the temperature changes rapidly, its thermal expansion and contraction are small, which is conducive to reducing the thermal stress.

Force to avoid brick cracking caused by temperature change. In some kilns that require frequent heating and cooling, the use of lightweight firebricks can better cope with the effects of this thermal cycle.

Thermal conductivity: Lightweight firebricks generally have low thermal conductivity, which is advantageous for some high-temperature kilns where energy loss needs to be reduced. The lower thermal conductivity can slow the conduction rate of heat in the wall, reduce the wall temperature, and help to maintain the stable operation of the kiln.

Load reduction: Lightweight firebricks are relatively light, and using them can reduce the deadweight load of the kiln. This is beneficial for some occasions with high structural requirements and the need to reduce the weight of small equipment.

Energy saving: lightweight firebricks usually have good thermal insulation properties, which can reduce the temperature of the outer wall of the kiln and reduce energy loss. This is a consideration for some high temperature furnaces that require energy consumption.

Process requirements: Different production processes may have different requirements for refractories. Some processes have high requirements for thermal capacity, thermal conductivity and other properties, and lightweight refractory bricks may be more in line with these requirements.

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