Hashøj, Denmark: Upgraded Biogas with Special Conditions

Project introduction

The “Forsk El” supported demonstration plant was built in close collaboration between biogas plant owner Erik Lundsgaard and Ammongas. The plant delivered the first upgraded biogas in Denmark to the local district heating plant.

For Hashøj, the plant was considered a pilot project, partly due to their own wish of upgrading the gas to the national gas grid, and partly to solve the problem of delivering their total gas production through a thin 3 km long pipeline to the heating plant (the produced gas is not delivered to the gas grid at the moment).

For Ammongas, it was about testing if the company’s patented stripper-absorber process, which was used to separate gasoline vapours in pure gasoline and air, was also able to separate biogas into pure methane and CO₂.

As expected, the plant worked from day one, and has since been used by Ammongas for testing and optimising different absorption media and controlling methods. It was on this plant that the ability to handle raw biogas without precleaning, even with thousands of ppm H₂S, was developed.

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