STEEL BELT CONVEYORS FOR SEVERE CONDITIONS since 1929

ERZ Entsorgung und Recycling Zürich

THE CHALLENGE

Within the project to join the metals recovery facility at KEZO Hinwil, the wet-to-dry conversion of the bottom ash handling system at the Hagenholz CHP plant in Zurich involved the replacement of the existing wet rubber conveyor belts with the Magaldi Ecobelt® WA conveyors.
In August 2015, StagAG awarded Magaldi a contract for the supply of four patented Ecobelt® WA conveyors to be installed at the Hagenholz waste incinerator in Zurich.

 

THE CUSTOMER

Stag AGis an internationally established company focused on the European market which, in its core business of “system engineering” develops and constructs standardised and tailor-made system solutions used in the handling of bulk materials. Its headquarters is in Maienfeld (Switzerland).
The final Client is ERZ, Entsorgung + Recycling Zürich, that owns and operates one of the most modern waste incinerators for the production both of heat and electricity. Located in North Zurich, close to the airport, the plant underwent in 2010 a massive 235 million Swiss Francs revamping, turning it into one of the most advanced incineration plants in the world, equipped with the latest state-of-the-art technologies and able to process up to 270,000 tons of waste per year.
Today, the plant is able to cover the electricity consumption of 50,000 people and to provide district heating to 80.000 households (16% of the total of Zurich houses).

 

THE SOLUTION

In August 2015, Magaldi was selected by Stag AG as the supplier of four steel conveyor belts for the bottom ash extraction in a completely dry way from the incineration lines #2K1 & K3 at Hagenholz CHP plant in Zurich. Since the bottom ash produced by waste incinerators is a heterogeneous material that may contain foreign pieces (e.g. coil springs, wires and metal rods) and large objects, the patented Magaldi Ecobelt® WA conveyors were chosen for installation. The Ecobelt® WA conveyors replaced the existing wet rubber conveyor belts within the overall wet-to-dry conversion of the bottom ash handling system.
The Magaldi conveyors, placed right downstream the existing hydraulic extractors, are 1,400 mm wide with pans made of stainless steel and a design capacity of 10 t/h each. After incineration, the dry bottom ash is then discharged onto a grizzly feeder to separate the large objects, and then released into the existing storage pit. Instead, most of bottom ash is transported by a new patented Magaldi Superbelt® reversible conveyor to a common rubber conveyor belt to be loaded onto special containers.
The bottom ash is finally dispatched to the metals recovery facility at KEZO Hinwil. This innovative facility, designed to treat about 200,000 tons per year of bottom ash, is the first fully-dry slag recycling plant in the world.

 

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