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14/06/2011

US Patent Issued to BEG on Feb. 1 for "Integrated Process for Waste Treatment by Pyrolysis and Related Plant" (Italian Inventors)

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Energy from Waste (Pyrolisis)   Main benefits | Plants | Photo gallery

Definition of Pyrolisis

Pyrolisis is a process of molecular dissociation in the absence of oxygen that, under particular conditions of pressure and temperature, turns the waste's organic substances into combustible gas (pyrolisis gas, or syngas) and into a solid component (coal, or biochar).
Pyrolisis gas, which represents 70% of processed waste, is extracted and energetically recovered in order to supply the process.
The obtained coal, which makes up for 30% of waste, is processed in a special section of the plant, called C.R.U (Coal Recovery Unit).

This being a cold process in the absence of oxygen, the oxidation reactions are negligible and don't produce dioxin and furan, polluting substances that are always present in exhaust fumes from traditional waste-to-energy facilities. Since the waste is not combusted, even the production of nitric oxide and acid gases is considerably reduced.

Main Benefits

The main benefits derived from the use of pyrolisis plants are:

  • Major reduction of process waste
  • Reduction of the environmental impact
  • Consent from the public

Major reduction of process waste:
Starting from solid urban waste, traditional systems of integrated selection and production of waste-derivative fuel and the subsequent waste-to-energy process generate, on average, a 50% of waste brought to the dumping ground. Pyrol-B pyrolisis plants, on the other hand, allow to decrease the process residuals close to a 10% of the weight and obtain pyrolisis gas with a high calorific power, thanks to an innovative process called W.ALT.E.R. (Waste Alternative Energy Recovery).
In this way, the electrical output of the plants – which at the moment is between 0,9÷1,0 MW per ton of processed waste – has been substantially increased.

Reduction of the environmental impact:
This being a process that takes place in the absence of oxygen, the oxidation reaction are negligible and the pyrolisis project doesn’t produce dioxin and furan, polluting substances that are always present in exhaust  fumes from traditional waste-to-energy facilities – incineration and gasification plants - despite the efforts to decrease them.
Furthermore, since this process doesn’t involve waste combustion, the production of nitrogen oxide and acid gas is substantially reduced, with considerable benefits on the fumes purification section.


Consent from the public:
Being this the only process capable of successfully recovering the energetic content of waste without combusting it, reducing to the minimum the process discards, pyrolisis is the waste-to-energy technology of the future, as confirmed by the authoritative Juniper Consultancy Service.

 

 

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