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High material handling rates in automatic operation 24/7 without a crane operator.
The Danish Amagerforbraending company processes refuse to generate electricity and supply district heating. Some 500,000 people live in its catchment area in the south of the capital Copenhagen. Besides recycling stations, Amagerforbraending operates a refuse incineration facility. The crane systems used in the facility, which was built in 1970, were fully automated in 2007.
Maximum efficiency was required in the material handling operation to process the constantly increasing amount of refuse and to ensure that the incineration lines are fed continuously. After the crane installations were fully automated, the former crane personnel was to be to utilized at qualified positions in the company.
The crane installations were initially equipped for automatic operation, which was only used at certain periods of time, however. In a further step, the Process Cranes were converted to fully automatic operation without any crane operators:
24 hours per day, 7 days per week.
A computer with a visualization system was additionally installed as an operator interface. This system
ensures that the personnel are continuously provided with information on the current position and status of
the cranes. The owner can program operation of the installation himself by means of configurable storage
and filling strategies and, in this way, optimize management of the bunkers. Capacity was increased by 30% after these modifications had been carried out.
Delivery of the refuse is controlled by a traffic light and gate system. During the truck unloading operation, this arrangement ensures that the area next to the corresponding gate remains blocked for the cranes so that the grabs are not buried beneath falling refuse. The refuse is delivered by some 450 vehicles every day.
The installation features blending programs and storage strategies to achieve uniform incineration and, as a result, the most constant calorific value possible. For example, the cranes create conical heaps of bulk material when the tipping positions have been cleared, which ensures optimum blending of the refuse.
After maintenance work has been carried out, the crane control system supports start-up of the incineration line with a strategy that gradually increases the amount of material which is handled.
The feed process is controlled by a program and adapted to the various bunker chutes. Since the individual lines are fed independently, bridges of refuse are not created and blockages do not form in the bunker chutes, which optimizes the material flow.
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