Biogas purification unit
AssigneeProdeval SAS
InventorsEric PEYRAT, Sebastien PAOLOZZI
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Abstract
Disclosed is a purification unit (UE) configured to receive an inflow of biogas (BS) and to separate said received inflow of biogas (BS) into a stream of biomethane (BM), preferably containing at least 90% methane, and a stream of residual gases (GR1), referred to as combustion gases, the methane content of which is greater than 25%.
Claims10
Purification unit (UE) constituted of three membrane stages (S1, S2, S3) configured to receive an incoming flow of biogas (BS) and to separate said incoming flow of biogas (BS) received into:
- a flow of biomethane (BM), containing at least 90% methane,
- a so-called “combustion” residual gas flow (GR1), the methane content of which is greater than 25%,
- a so-called “depleted” residual gas flow (GR2), the methane content of which is below a predetermined threshold (SP).
Purification unit (UE) according to any one of the preceding claims, wherein the predetermined threshold (SP) is 10%, to valorize the depleted flow (GR2) in a valorization module (MV), for example by liquefaction or compression, or instead 0.5% vol. of methane to be able to discharge the depleted flow (GR2) into the atmosphere.
System (1) for producing biomethane (BM) comprising:
- at least one purification unit (UE) according to any one of the preceding claims, electrically supplied,
- at least one residual gas combustion module (MC) configured to produce electricity by burning said combustion flow (GR1), and/or
- at least one valorization module (MV) configured to receive the depleted flow (GR2) in order to valorize it.
Method of purification (UE) of an incoming flow of biogas (BS), said method, implemented by a purification unit (UE) according to any one of the preceding claims, comprising the steps of:
- reception (E1) of an incoming flow of biogas (BS),
- separation (E2) of said incoming flow of biogas (BS) received into a flow of biomethane (BM), preferably containing at least 90% methane, a so-called “combustion” residual gas flow (GR1), the methane content of which is greater than 25%, and a depleted residual gas flow (GR2), the methane content of which is less than a predetermined threshold (SP).
Method according to the preceding claim, comprising a step of combustion of the combustion residual gas flow (GR1) in a combustion module (MC).
Dependencies are inferred from the claim text.