The incinerator is modular, consisting of two separate chambers: the moving grate chamber and the cyclone chamber. It is also possible to combine two moving grate chambers with one cyclone chamber in the second stage. The moving grates are in the primary chamber, forcing the waste to flow downwards so that it doesn’t accumulate in any one location. This increases the surface area of the waste, resulting in a higher burning rate. A secondary cyclone chamber ensures high flying ash separation and the burning of flue gases. Gas can be cooled using the boiler (energy recovery) or through air cooling. Airflow in the incinerator is actively controlled using advanced measurements, resulting in a smaller flue gas pipeline and blower. The modular structure of the incinerator adds flexibility when designing ship layouts.
The shredded burnable waste is fed by gravity into the incinerator’s feeding chamber. Hydraulic gate valves then feed the correct amount of solid waste into the furnace and prevent flames and hot air from escaping into the dry garbage silo. Sludge oil burning is available as an option – this happens via a sludge nozzle fitted in the primary combustion chamber, designed to handle sludge oil with relatively high water content.
The flue gas inside the burning chamber reaches an extremely high temperature and stays in the secondary chamber for a long time, resulting in fewer particles and lower NOx and CO emissions. The flue gas fan keeps suppression in the furnace controlled by continually monitoring the pressure in the combustion process.
The incinerator fulfills the emissions requirements set out in Annex VI of the IMO guidelines.
The incinerator is designed for continuous operation and features automatic removal of ash from the ash bed. A screw conveyor discharges the ash from the incinerator and feeds it into either an interchangeable ash container or an ash vacuum system. The ash vacuum system conveys the ash through an ash separator to separate unburned particles, such as glass and metal, after which the ash is pneumatically transported to a bagging unit.
IMO guidelines in Annex VI are considered maximum limits for incinerator flue gas emissions.