Increased Flexibility for Cement Plants with new Storage Feeder System

Storage & Handling

Increased Flexibility for Cement Plants with new Storage Feeder System

Samson Feeder from Aumund in New Operation
The Samson feeder has found an additional application as surface storage feeder SSF, thus making operations of a cement mill much less complex and much more cost effective. It adds increased flexibility in handling different materials and in adapting the plant layout to changing production demands.
(ed. WoMaMarcel - 26/2/2015)
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A combination of several SSF units can be used when more than one material is to be added. The different materials can be metered based on the plant’s needs. Enclosures on the SSF can also be included to prevent environmental impact when handling dusty materials or materials that need to be kept dry. The key element of the feeder’s flexibility and performance is the fact that material is stored horizontally. In no case can the material height exceed the width, therefore bridging is impossible. Also due to the large width, high storage capacity is possible. The conveying and discharge function is carried out at very low belt speed. This allows a higher belt angle, resulting in compact elevation rise to allow weight feeder or conveyor belt loading.

Actual: Complex Plant Design

Cement plant design for raw mill feed incorporates an additive covered storage area which frequently utilizes front-end loaders to load multiple materials via a hopper and feeder. This feeder, apron or other type, feeds a long conveyor belt system with reversible belts or multi-chute system to distribute the additive to 3 to 5 bins. Such a layout dictates that the additive storage area must be some distance from the feed bins to allow a 15 degree belt to convey material to the top of the raw mill feed bins from where the various additives are then metered out.

Depending upon the material properties these bins will have to be of special construction to resolve anticipated flow problems. Often expensive liners and special feeders, like rotary plough type, have to be used. If hard rock limestone or additives are required, apron feeders combined with belt weigh feeders may be needed. These metering devices and the assortment of feeders then finally feed onto the mill feed belt. This rather complex installation requires a lot of maintenance and by experience it is a main cause of mill downtime. Not to mention that if the plant wants or needs to use other raw material resources in future, significant modifications or feeding problems might occur.

Simplification by SSF

In the ideal plant layout, the additive storage building could now be placed next to the mill feed belt by using the Samson feeder as an SSF. Special bins, feeders, belt transfer and distribution systems are to be eliminated. The loader now feeds additive directly to a bank of three to five SSF units arranged along the storage building. They would feed, via weigh belt feeders, directly onto the mill feed belt. Each feeder receives material by loader. The feeder in turn maintains a level of material in the outlet chute, which feeds the weigh feeder.

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