Biogas drying

Biogas leaves the digester warm and saturated with water vapour. As it cools on its way to the consumer, that water condenses in pipes, valves and equipment. Drying removes the moisture from the gas before it can cause damage there.

Process steps

• Cooling – the biogas is cooled below its dew point so that the water vapour condenses out.
• Liquid separation – the condensate is separated and discharged from the gas path.
• Reheating – the dried gas is warmed again and thus moved away from its dew point, so no further condensate forms in the downstream pipework.

The plants are designed for the gas volume flow and the conditions on site and can be combined with biogas desulphurization – including as a retrofit to an existing plant.

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