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18.11.2013
Wear-protected rotary valve outperforms screw pumps on several fronts
Coperion, Weingarten, Germany, reports that it recently supplied and successfully commissioned a wear-protected rotary valve for the RWE Power AG Ville /Berrenrath coal preparation plant. The Type ZXQ valve, with a diameter of 600mm, feeds dry lignite into a pneumatic conveying system that transports the material from a new vertical roll mill to the storage silos. The conveying pressure of the system is within the range 0.9 - 1.1 bar. The rotary valve is designed for a capacity of 60t/h, although a peak performance of approximately 80t/h has already been recorded. From the outset, this application has demonstrated the advantages of a rotary valve over screw pumps:
- The rotary valve does not constitute a potential ignition source, as the circumferential speed at the normal operating rate is below 1m/s. The valve is also available in flame-resistant versions.
- With an operating power requirement of only 4kW, compared to approximately 100 kW in the previous system, huge electrical power savings are possible. In addition, simple maintenance and extended maintenance intervals lower operating costs even further.
- Owing to its lightweight design and low operating speeds the valve only requires a compact, simple foundation. These features also result in lower noise emissions.
- The tightness of the valve makes it suitable for lighter, fluidised products such as dry lignite with bulk densities below 600kg/m³, because sealing is achieved by precise gap dimensions and not by compression of a bulk material plug.
- The rotary valve tightness is equally effective in partial load and full load operation. Therefore, start-up of the mill can be achieved without the problems that previously occurred with insufficient sealing in partial load operation using a screw pump.
In another RWE coal plant, a rotary valve of the same design achieves conveying capacities up to100t/h. www.coperion.com
Type ZXQ wear-protected rotary valve feeds dry lignite at over 60t/h into a pneumatic conveying system
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