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Advanced biomethane plant goes online in France

The Longchamps biomethane plant in the Franche-Comté region in eastern France has gone live.

The plant supplies 70m3/h of biomethane to the natural gas grid of the French gas distributor GrDF (Gaz réseau Distribution France).

As feedstock, the plant uses approximately 6,000 tonnes of agricultural leftovers a year for the production of biogas from anaerobic digestion.

To ensure effective biogas processing, German plant manufacturer Weltec Biopower decided to deploy flexible, compact membrane technology.

In the three-stage separation procedure, methane is separated from carbon dioxide (CO2), water vapour, and other components with the help of special polymer membranes.

The Weltec membrane procedure is highly efficient and delivers a methane yield of about 99%.

The upstream compression is another advantage of the procedure.

In this way, the separated methane already has the needed pressure for feed-in to the natural gas grid without being compressed again.

This saves costs by eliminating the need for an additional compressor and enables economic use of Weltec biogas processing even for smaller plants.

This processing method also saves money in other areas as the molecules are separated at ambient temperature and without the addition of chemicals.

To optimise the plant synchronisation, Weltec integrated the custom-developed LoMOS SPS control.

One of the special features of this system is an SQL database-based task management, where the user merely needs to enter individual tasks for the biogas plant calendar, after which the LoMOS control automatically executes the entries.