A fluidized-bed-type carbonization system is innovative waste treatment (resource recycling) technology. It does not incinerate wastes but recovers them as carbide to enable their effective use.
This system addresses diverse challenges posed by contemporary waste treatment including the following:
- Prolongation of service life for final treatment site (reclaimed land)
- Contribution to the development of a resource recycling society
- Reduction of global warming gas (CO2)
- Reduction of environment impact (decrease of dioxin level, etc.)
- Decrease of life cycle costs
The generated carbide can be used in a wide range of applications as a compost activator, soil improver and snow melting agent besides its use as a coke alternative in steelworks.
Image for effective use of waste carbonization (in the case of using electric furnace steelworks)
METAWATER's fluidized-bed-type carbonization system has the following excellent characteristics.
Can manufacture high-quality carbide
Because impurities (iron, aluminum, debris, etc.) included in the wastes are decomposed and eliminated in the carbonization furnace, pure and high-quality powder carbide is obtained.
Can adjust composition and format of carbide depending on the user's request
The percentage of inflammable components in the carbide can be adjusted. Besides, it is possible to produce various forms of carbide depending on the client's applications such as demineralization through washing, granulation, bag packing and so on.
Addresses various types of wastes
Wastes with a wide range of properties can be carbonized stably from sludge to plastic wastes thanks to the agitation effect of a fluidized bed and the heat accumulation effect of the sand inside the furnace.
Contributes to reduction of global warming gas (CO2)
Because the carbonization process is conducted by using energy of the wastes themselves, the consumption of auxiliary fuel is minimal. Besides, by using carbide as an alternative to fossil fuels, CO2 emissions can be reduced.
Compared with the kiln method, the fluidized-bed-type requires a smaller installation area. This makes it possible to use compact equipment.
Because non-oxidized high quality metals (iron, metals) are recovered, recycling is easier
The iron and aluminum recovered from the bottom of the carbonization furnace are clean, because scale is ripped off through friction with the sand. Further, because they are not yet oxidized, recycling them is easy.
Operation, maintenance and management can be conducted more easily.
Because the carbonization furnace has no movable element, and the carbonization furnace, carbide recovery device and secondary incineration chamber are consolidated, there's no risk of gas leakage and operation, maintenance and management can be conducted more easily.
A long service life of refractories is achieved by making active use of our long experience in the field of ceramic technology.
Same and simple start-up and shutdown of systems and intermittent operation is easy
Thanks to the heat accumulated in the sand, the time required for system start-up is short and intermittent operation is easy. Besides, because the amount of charge (inflammables) in the carbonization furnace is low, start-up and shutdown can be conducted safely and easily.
The figure on the right indicates an overview of this technology. The wastes charged into the carbonization furnace are heat-decomposed in a sand layer maintained in a temperature range of 450℃ to 600℃. After the decomposition, carbide and thermal decomposition gas are obtained. The incombustibles included in the wastes (iron, aluminum, debris, etc.) are separated in the sand layer and withdrawn from the bottom of the carbonization furnace.
The carbide and thermal decomposition gas are fed to the carbide recovery unit from the top of the carbonization furnace. Then, they are separated by centrifugal force. The recovered carbide undergoes a series of mechanization processes such as washing to eliminate chloride, granulation process and packaging process and is then shipped out as a product. The heat decomposition gas is completely incinerated in the secondary incineration chamber. This is followed by heat recovery, exhaust gas treatment process and discharge to the atmosphere. The iron and aluminum recovered from the bottom of the carbonization furnace are clean, because scale is ripped off through friction with the sand. Further, because they are not yet oxidized, recycling them is easy.