Insulation Mechanism of Lightweight Insulating Refractory Bricks
Conception: Heat is a kind of energy, which is closely related to the movement of the molecules, atoms, and electrons that make up the material. The thermal phenomenon of all substances is the result of the collision, transfer and movement of particles inside the substance.
Lightweight Insulating Refractory Bricks Uses
In thermal industries such as kilns, the loss of energy due to heat transfer becomes extremely apparent. The temperature difference between the inside and outside of the kiln is above 800 ° C. The role of the lightweight insulating refractory bricks are to slow down the heat transfer process through the internal holes, thereby achieving the effect of heat insulation.
Generally, lightweight insulating refractory bricks materials are mainly composed of a solid phase and a gas phase, so the overall heat transfer process of the material consists of heat transfer between the solid phase, heat transfer between the solid phase and the gas phase, convection between the gas phase, and pores. Between radiant heat transfer and so on.
When materials are used at high temperatures, radiation is the main factor that affects thermal conductivity: when used at normal temperatures, radiation is transformed into secondary factors.
Why the Lightweight Insulating Refractory Bricks Can be Insulated?
Lightweight Insulating Refractory Bricks Uses
In thermal industries such as kilns, the loss of energy due to heat transfer becomes extremely apparent. The temperature difference between the inside and outside of the kiln is above 800 ° C. The role of the lightweight insulating refractory bricks are to slow down the heat transfer process through the internal holes, thereby achieving the effect of heat insulation.
Generally, lightweight insulating refractory bricks materials are mainly composed of a solid phase and a gas phase, so the overall heat transfer process of the material consists of heat transfer between the solid phase, heat transfer between the solid phase and the gas phase, convection between the gas phase, and pores. Between radiant heat transfer and so on.
When materials are used at high temperatures, radiation is the main factor that affects thermal conductivity: when used at normal temperatures, radiation is transformed into secondary factors.
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| LightWeight Insulating Refractory Bricks |
The reason why the light-weight insulation refractory brick has a small bulk density, a low thermal conductivity, and a good thermal insulation effect is because of its extremely high apparent porosity, which causes a large amount of air to exist in the material pores. The thermal conductivity of air is much lower than that of solids. When the air content in the material is high, the convective heat transfer between the gas phases in the pores will increase, and conversely, the convective heat transfer will be reduced. Light-weight insulation refractory brisks' structure has many closed pores inside the structure, so the convective heat transfer between the gas phases in the pores contributes less to the thermal conductivity of the material.
The higher the apparent porosity of the lightweight insulating refractory bricks material, the higher the gas content in the pores inside the material, and the relative solid content will be reduced, thereby reducing the effective thermal conductivity between the solid phase and the gas phase and improving the material's thermal insulation performance.
The effect of radiation on thermal conductivity is dominant when materials are used at high temperatures. The effective thermal conductivity of the thermal insulation material is the superposition of the solid and gas phase heat transfer and radiation heat transfer. A number of studies have shown that the effective thermal conductivity of porous thermal insulation materials can be accurately expressed with a simple, uncoupled relationship.
According to the above relational formula, the effective thermal conductivity of the porous thermal insulation material is directly related to the porosity of the material, the thermal conductivity of the solid phase and the gas phase, and the average thermodynamic temperature of the material. Lightweight Refractory Bricks.The indirect effects of lightweight insulating refractory bricks materials in the process of use can be well explained according to the theory.
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