Flexible operation with both gas to grid and electrical power generation

In this biomethane plant built by Agraferm for the Danpower Group, 1,400 Nm³ of raw biogas is turned into 700 Nm³ of biomethane every hour, i.e. it is brought up to natural gas quality using a physical pressure washing process and then fed into the natural gas grid operated by the local gas distributor ENSO Netz GmbH. A further 600 Nm³/h powers the local 1.2 MWel CHP-unit, which also is used to provide electrical power flexibly at peak demand hours.

The plant is characterised by the efficient use of a technology, which allows for a higher dry matter organic loading rate and at the same time a smaller fermenter and a reduction in energy consumption. With just 2 fermenters and 1 secondary fermenter the plant produces an output of around 4 MWel.

This type of technology is particularly interesting for locations with a limited amount of available space. Furthermore it was developed to deal with a very high level of viscosity without having tocompromise on safety, flexibility or even gas output. This allows the operator the option of using a very varied and opportunistic substrate mix.