Complex and curved

Cong Thanh, the Vietnamese cement producer, relies on the system solution expertise of the Beumer Group for transporting crushed limestone from the quarry to the blending bed. There were intensive discussions about the various technical options in a joint workshop held with the producer. Various routes were worked out and compared on the basis of the narrow terrain that was available. Beumer has appropriate software to match satellite and aerial photographs with topographical data. One conveyor section that drops steeply in some places with numerous obstacles in the terrain and seven road crossings was particularly challenging.

A total system consisting of four conveyors with a combined length of 3.5 km is now in use, Beumer also supplied a PLC plant control system. The main component is an overland conveyor with three horizontal curves and a total drive rating of 600 kW. It is designed for a continuous conveying capacity of 2200 t/h.

The heaped material is transported in trucks from the quarry face to the crusher. The limestone that has been pre-crushed to less than 100 mm is then transferred by discharge conveyors to an accelerator belt that feeds the long belt conveyor.

The troughed belt conveyor for downhill transport is 1000 mm wide, with a distance between centres of 3200 m, and drops 70 m. It is equipped with two tail drives and one head drive, each with a rating of 200 kW. The conveying speed is 4.5 m/s. The low operating costs are a special feature. Due to the downhill section, the operation of the fully loaded conveyor is virtually energy-neutral. Its consumption during continuous operation is less than 200 kilowatts, which means that not even 0.1 kilowatt is required per tonne of transported material. This, together with the low maintenance and repair costs, contributes substantially towards cost-effective operation.

After the installation and commissioning, the Beumer team submitted the plant to a performance test that it passed successfully on all points.

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