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Biogas valorisation

Incomes of biogas valorisation to heat

Before July 2006, Electricité de France (EDF) bought electricity resulting from biogas for the price of 5,8 c/kWh. After July 2006, the tariff of repurchase of electricity by EDF is all the more important (basic tariff from 7,50 to 9 c/kWh up to 14 centimes/kWh) if produced heat is valued in optimal conditions. 

Part of the heat produced by the co-generator is used in auto-consumption to heat the digester.

The rest is available for several types of valorisation: heating of buildings, swimming pools, greenhouses, drying of agricultural products, drying in barns, mushroom cultures.

For economic reasons (cost of the heating network), heat valorisation must be done near the exploitation. 

When the landfills or the digesters are built near an industry site likely to accept biogas, the combustion constitutes the best means of valorisation adapted to biogas because it combines the advantages of the simplicity of the process, a reduced investment and very interesting ROI

Transport of biogas :

The composition of biogas when it comprises at least 20% methane counts less for burning in furnaces or boilers provided that the materials constituting the equipment are adapted to gas which have a high content in H2S.

Biogas treatment can be limited to a simple de-vesiculor at the entry of the booster to eliminate the liquids, and a bi-phasic separator. 

Transport is carried out in PEHD canalisations, Ř <= 160 mm
The pressure will have to be calculated so as to obtain approximately 300 mbar on arrival
According to the sulphur content of biogas (between 0 and 6.000 Mg (N) m3) it will be necessary to carry out a biogas desulphurization before burning.


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