Igniss Energy

Igniss Energy

- Fluidized Bed Incinerator

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The combustion chamber is full of floating particles, like ash and kind of small stones, and in the floating area is the waste mix burning. At the bottom in the combustion chamber there is a gas/air mix injected. The amount of air/gas is maintaining the combustion process. This type of incinerator is made for waste or fuel which is able to float. For this the waste is like a homogeneous mixture. Like WWTP sludge, crushed coal or carbon, MBM (meat and bone meal), etc. If the waste would not be homogeneous it there would be part which are falling, parts which are floating and parts which are flying away by pneumatic transport. For this type of waste exist fluidized bed incinerators with a kind of basket. This basket fluidized bed applications are only in a few cases justified and correct working.

Fluidized bed principle

A normal combustion process requires air (oxygen). If the amount of air (oxygen) is to less, there is an incomplete combustion. If there is to much air, the air is cooling the combustion chamber. So there is an optimum of oxygen for good combustion. Extra, in a fluidized bed, the waste needs to float, so the combustion can be done from all sites. So the the first requirement is that we to make the waste floating, and secondly the correct amount of air is necessary for correct combustion. Because, if the correct amount of air makes the waste flying out of the combustion chamber it is also not suitable waste for fluidized bed combustion. Some fine tuning can be done by injecting gas with air, or adding sand particles for floating. But with limits, because injecting gas for example is agains the 'waste-to-energy' principle.

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