Refractory Insulation

It is important that the energy provided by the heat must be contained inside the chamber(s) of industrial furnaces. This is because both heat accumulation and energy savings depend on this matter.  To ensure this, industrial furnaces are covered by some thermic insulation material, which is called refractory insulation. Without this insulation, the heat will escape through the layers between fire bricks and cool the furnace. Refractory insulation must be dense because of this reason and have the capacity to conduct the heat. Refractory insulation acts as a thermal barrier between slags, flue gasses, liquid metal and the wall of the industrial furnace.

Refractory Insulation Types

Refractory insulation will also prevent the erosion of walls and act like a chemical protective barrier when needed. There are several refractory insulation methods, but the most commonly known techniques are:

-          Dry Insulation : Usually vermiculite or perlite are used for this type of insulation. It is the cheapest option, although suited for small furnaces only. A thickness of 4 – 10 cm is preferred during the application.

-          Ceramic Fiber Insulation : Application costs are higher, but this is the most efficient way of refractory insulation. As can be guessed by the name, ceramic fiber insulating blankets or ceramic fiber pads are used for this option. Usually, an application thickness of 1 – 5 cm is enough. While working with ceramic fiber materials, necessary precautions must be taken because of the health risks.

Thermal Insulation of Industrial Furnaces

-          Mixed Insulation : Vermiculite or perlite are still the main ingredients, but other materials are also added to the mixture. These materials are Portland cement and lime, in most cases. Suited for medium-sized furnaces.

The main goal of refractory insulation is to reduce the heat loss, preserve energy and increase the lifetime of the furnace. A professionally applied insulation will also increase your business’ productivity too. 

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