Wet waste with a solid content of 20% DS is fed from a silo into the internal dryer (ID). Wet waste can either be FW (Food Waste), BW (Bio Waste) or a mix of both. The internal dryer is located in the incinerator’s primary chamber and features a paddle shaft with variable speed rotating in a trough, called a bedstone. These Bedstones are made of a special refractory material. The wet waste is moved, dried and burned by using excess energy from the dry waste and some added air, which is injected above the internal dryer.
The design ensures optimal waste mixing and heat transfer. Since the drying of the wet waste utilises excess energy from the burning of dry waste, using the internal dryer limits the use of water injection for temperature control.
The internal dryer has been installed on several new build vessels and is now available as a retrofit installation for existing on-board incinerators. The internal dryer can be retrofitted in existing incinerators by building a foundation for the bedstones and modifying the steel structure in the incinerator wall for fitting the dryer’s flange.
