The
injection system conditions biomethane to the quality standards set by PG&E
Rule 21 or similar standards set by different energy providers.
The quality of the biomethane must be set according to the quality standards of
the gas distribution system before being injected. The biomethane to be
injected is conditioned by adding air or liquefied gas and dehumidified and
desulphurized biogas.
An
injection system consists of the following components:
- Biomethane quality
measurement
- Conditioning
of biomethane: addition of liquefied gas if necessary
- Compression (two
redundant compressors)
- Drying
Process gas chromatograph, licenced calibrated measurement of the calorific
value, standard density and carbon dioxide portion
- Odorization
unit: Gases in the public supply system must possess sufficient odor to be
detected if a leak exists. If this is not the case, the gas will have to be
odorized.
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