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Biogas is upgraded

German company ETW Energietechnik has developed the SmartCycle pressure awing adsorption (PSA) technology to upgrade biogas to renewable natural gas (RNG).

SmartCycle has an extremely low energy consumption of 0.14KWh/Nm³. The

optimised pressure swing process made it possible to use an innovative dry, low-maintenance compressor technology with a very high availability.

The biomethane plant designed by ETW automatically adjusts the pressure swing cycles to a varying inlet gas quality and volume flow. This enables total control by the operator over the outlet gas purity (more than 99%) or the desired heating value.

This is especially useful for operators of waste or sewage plants, which deal with always changing biogas qualities and flows, or those who want to shift spontaneously between the electricity and/or RNG markets to maximise income.

No other consumables than electricity are demanded, resulting in extremely low operating costs.

ETW has built four large-scale SmartCycle PSA plants with documented overall onstream time of more than 80,000 hours and 995. The upgrading technology will be shown at the EnergyDecentral exhibition on 15-18 November in Hannover.

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