Dry Bottom Ash Handling in Waste Incinerators
ECOBELT® WA - Dry Waste Bottom Ash Cooler

The Magaldi Ecobelt® WA is the ideal steel conveyor belt for dry extraction, cooling and handling of bottom ash produced by waste incinerators.
According to boiler lay-out and restrictions, the same equipment can also be used to convey grate siftings.
Incinerator bottom ash is a granular material that consists of a mix of inert materials, metals and ash. Since the combustion process cleans and separates metals and inerts from organic components, a dry extraction approach is the key factor to allow a more effective metal separation from inert matter.
The Ecobelt® WA overcomes the limitation of conventional wet ash extractors thanks to a combination of the dependable Magaldi Superbelt® technology and a “dry” cooling process.
In the Ecobelt® WA system, ash cooling is carried out by ambient air. The amount of cooling air flowing into the furnace is limited by means of suitably designed devices that allow the ash passage while preventing uncontrolled air backflow to the furnace. Cooling air can be vented to the secondary air fan inlet and then injected into the combustion chamber. As a result, the relevant amount of energy, mainly in the form of ash sensible heat, can be recovered to increase boiler efficiency.
Downstream the Ecobelt® WA, ash can be released completely dry or conditioned, depending on the material characteristics and the Client’s needs.
Moreover, the dry technology can be implemented either in new projects or as a retrofit replacing conventional wet ash extractors.