Theoretical feasibility for ecological biomass ash recirculation: chemical equilibrium behavior of nutrient elements and heavy metals during combustion

Article Abstract:

The removal of heavy metals from ashes that are recirculated back to the forest and farmlands can be possible through the use of the proposed high-temperature cyclone separation technique. The recirculation of the ashes, which contain vital nutrients, is important in the global efforts to increase energy production from biomass fuels. A number of chemical equilibrium model calculations were used to determine the fate of both nutrient elements and heavy metals during combustion in the proposed separation technique. Results showed that it is possible to remove heavy metals and retain nutrients in ashes by using hot cyclone separation methods.

Other Commercial and Service Industry Machinery Manufacturing, Ground or Treated Mineral and Earth Manufacturing, Minerals, ground or treated, Fly Ash, General industrial machinery, not elsewhere classified, Waste Separation Equip, Methods, Soil pollution, Biomass, Separation (Technology), Waste separators

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Behavior of heavy metals in the combustion gases of urban waste incinerators

Article Abstract:

The behavior of heavy metals contained in fly ash from the incineration of urban waste was studied. The results indicated that three relative stabilities for heavy metal compounds could be obtained. The element was transported by mechanical mechanisms when the oxide's stability was greater than the chloride's stability, by volatilization-condensation and mechanical mechanisms when oxide and chloride stabilities were similar and by volatilization-condensation when the the chloride's stability was greater than the oxide's stability.

Combustion gases

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Volatilization of the heavy metals during circulating fluidized bed combustion of forest residue

Article Abstract:

Researchers investigated a means for removing heavy metals and other elements from fly ash produced by burning forest material. The test was performed in a fluidized bed boiler based in Sweden. Laser diffraction was used to determine the size of fly ash particles. Elements were found at different amounts and particulate size depending upon where samples were taken from the boiler. Bottom ash in 830 degrees C contained less of the elements than the coarse fly ash. Some elements, like zinc, were found only in the coarse fly ash.

Sweden, Zinc, Zinc (Metal)

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