Multi-layer fluidized incinerator
Outline
In the conventional fluidized incinerator, air is supplied only from the sand layer at the bottom. In the multi-layer fluidized incinerator, air is supplied also from the middle and upper sections of the furnace to form an optimum incineration field. This sludge incinerator is friendly to the global environment since it reduces the generation of N2O and also reduces fuel consumption.
*N2O (dinitrogen oxide) ... The gas has a greenhouse effect that is 310 times higher than that of CO2. Since a large amount of the gas forms while incinerating the wastewater sludge, some countermeasure are required.
Features
Formation of an ideal combustion field
The system creates ideal combustion conditions inside the furnace through the use of a “zone incineration technology” which creates multiple incineration zones by supplying air additionally from middle and upper sections of the furnace, and also by using the “multi-layer incineration control technology” that controls the supply of air and fuel and keeps them at appropriate levels. As a result, a significant reduction is achieved in the N2O level and in fuel consumption when compared with conventional high-temperature incineration.
Realization of stable operation
Based on the multi-layer incineration technology, the system constantly monitors the operation statuses (furnace temperature, air level, and fuel consumption) and simultaneously controls multiple parameters to achieve stable operation.
Applicable to existing fluidized incinerators
In addition to newly installed ones, existing fluidized incinerators can be modified and made into multi-layer fluidized incinerators.
Environmentally-friendly incinerator
A multi-layer fluidized incinerator offers three (3) operation modes to suit the customer’s needs. It reduces greenhouse gas and fuel consumption efficiently.
Example of implementation
Nanbu Sludge Plant Incinerator Unit 3 (Bureau of Sewage, Tokyo)
The multi-layer fluidized incinerator is based on an incineration method jointly developed by the Bureau of Sewage (Tokyo) and METAWATER Co., Ltd.
At the Bureau of Sewage (Tokyo), a multi-layer fluidized incinerator, the result of a modification of a conventional fluidized incinerator, is currently in operation.
