Heating method for high temperature industrial furnace

September 28, 2018

Heating method for high temperature industrial furnace

When refractory products are fired in an industrial furnace, they are necessary to obtain uniform heating as evenly as possible. There are four methods of common heating.

1. Internal heating

According to the nature of the fired product and the structure of the kiln, the fuel is mixed into the material for combustion heating. For example, when burning light refractory materials, sawdust, coke powder and anthracite powder are added to the mud material. Using this way not only the heat is uniform, but also the burning of the combustible material causes the product to have a certain porosity. 

2.Bottom heating

Because the hot air flow has a tendency to rise upwards, it is easy to cause uneven temperature distribution in the heating chamber. And the bottom burner is difficult to maintain, the burner coverage is not large, so there are not many applications for bottom combustion.

3. Side heating

It is the most widely used heating method in the silicate industry, such as downdraft kiln, shuttle kiln, tunnel kiln, pool kiln, etc. Due to the large cross-fired surface of the lateral combustion, a relatively uniform temperature distribution can be obtained on the bottom of a larger area of the furnace. In order to avoid the direct erosion of the flame on the material causing coking or over-burning deformation on the material, a flame can be used to align the combustion passage or use a fire wall. In side combustion, as in general tunnel kiln, the kiln should not be too wide due to the limitation of the burner's jet force.

4.Top heating

The width of the kiln can be not restricted. The burner is arranged at the top and the number can be unrestricted, so that small flow rate and multi-point dispersion configuration can be adopted to further improve the uniformity of the temperature distribution in the kiln and the heat transfer conditions of the flame gas to the products.