Wear-protected rotary valve for dry lignite

Coperion GmbH supplied and successfully commissioned a wear-protected rotary valve for the RWE Power AG Ville/Berrenrath coal refinery. The rotary valve type ZXQ with a diameter of 600 mm, feeds dry lignite into a pneumatic conveying system that transports the material from a new vertical roll mill to the storage silos (Fig.). The conveying pressure of the system ranges from 0.9 to 1.1 bar. The rotary valve is designed for a capacity of 60 t/h, however, a peak performance of approximately 80 t/h has already been recorded.

In operation the use of the rotary valve showed the following...

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