Anthracite, as the name implies, does not produce smoke and looks very environmentally friendly, but we do not use it as the main fuel for rotary kilns, but use bituminous coal. What is the reason? Henan Xingyang Mining Machinery Factory will introduce to you:

In actual use, the reason why anthracite is not suitable or used as much as possible as fuel is mainly because if anthracite is used in the calcination of rotary kilns, it is not suitable for the need to burn materials. During the calcination process of the rotary kiln, not only the flame must be concentrated at high temperature and burn quickly, but also the flame must be controlled to a certain length to promote a complete chemical reaction.

The characteristics of anthracite are high ignition point, relatively low volatile matter, high fixed carbon, slow combustion, elongated flame, unconcentrated, low strength, and relatively difficult calcination. Therefore, rotary kilns generally use bituminous coal when calcining materials.

But it can be replaced in some cases. What is the reason?

But often in some areas, there is no bituminous coal or the price of bituminous coal is very high, in which case it can also be used. The main technical measures are: use three-channel or multi-channel burners, and increase the fineness of coal powder to promote the combustion of anthracite, adjust the flame length, and meet the requirements of rotary kiln calcination.

The decomposition furnace also uses bituminous coal, which can be used partially or completely. The main technical measures are: increase the volume of the decomposition furnace, extend the residence time of coal powder in the decomposition furnace, and increase the fineness of coal powder to promote the combustion of coal powder in the decomposition furnace.