Читать книгу Coal-Fired Power Generation Handbook - James Speight G., James G. Speight - Страница 63

An impactor is a size reduction device that strikes (impacts) the coal which is then thrown against a hard surface or against other coal particles. The coal is typically contained within a cage, with openings on the bottom, end, or side of the desired size to allow pulverized material to escape.

The rotor-type impact mill uses rotors to effect size reduction. In the mill, the coal drops into the path of the rotor, where it is shattered, driven against the impact surface, and further reduced in size. The material rebounds into the path of the rotor and the cycle repeats itself until the product is discharged from the base.

There are two types of impact crushers: (i) horizontal shaft impactor and (ii) the vertical shaft impactor.