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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.