Updated: July 2002
Fluidized Bed Furnace (FBF)1. Outline of the equipment
Hot air or room temperature air is blown from the furnace bottom to the interior of the furnace to blow the fluid medium as if water boils. Waste is fed into this fluidized bed and burnt efficiently within a moment. Energy is saved by recovering the waste heat from furnace exhaust gas to heat combustion air and by recovering steam. As the odor components contained in exhaust gas is burnt and decomposed in the furnace, no deodorizing device is necessary. As the total amount of the incinerator ash is discharged with exhaust gas, it is required to collect particulates efficiently by using a filter dust collector, a cyclone or an electrostatic precipitator (ESP) and the like.
Burnt ash is powdery and methods for its application for manufacturing interlocking blocks are under research and development.
2. Capacity and Characteristics
- Testing objects: Sewage sludge, municipal refuse, industrial waste, etc.
Capacity: A furnace of ca. 15-300 t/d capacity can be built.
Combustion temperature: More than 800ºC in the furnace.
Air ratio: 1.3-1.5
Volume reduction rate: 1/6-1/12
Property of exhaust gas:- Particulate concentration: 0.01 g/m3N or lower (after wet gas treating)
Sulfur oxide concentration: 20 ppm or lower (after wet gas treating)
Hydrogen chloride concentration: 10 mg/m3N or lower (after wet gas treating)
3. Features
As the wastes are stirred and mixed together strongly in the fluidized bed, they can be dried and burnt in a moment.
As no moving part is installed in the furnace, it can be easily maintained.
As the heat capacity of the bed is large, the dropping of the furnace temperature is slow and thus it is suitable for intermittent operation of the furnace.
As the devices constituting the whole system are fewer than other incineration process, FBF has the advantage of the installation and the construction cost.
