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GrønGas commissions bioLNG plant in Denmark

GrønGas commissions bioLNG plant in Denmark
The GrønGas Hjørring biogas plant is complete with biogas upgrading to biomethane and liquefaction to bioLNG (photo courtesy GrønGas).

In Denmark, Wärtsilä Gas Solutions, part of Finland-headed international technology major Wärtsilä Oyj has announced the commissioning of a new 17 tonnes per day bioLNG plant in Hjørring. The contract for a biogas upgrading and liquefaction unit was awarded to Wärtsilä in 2022, and the official start-up took place in June 2023.

The facility is one of two biogas plants owned and operated by GrønGas A/S in Denmark. The other plant, located in Vrå, also features a Wärtsilä biogas upgrading solution.

The plant in Hjørring has an annual production capacity of more than 6,200 tonnes of bioLNG. Denmark is a world leader in biomethane (aka renewable natural gas – RNG) development, and these plants are seen as being an important element in securing the country’s green energy future.

Low power consumption

The Wärtsilä Mixed Refrigerant (MR) liquefaction unit alone has an exceptionally low power consumption of <0.75 kWh per kilogram of bioLNG liquified.

This, in combination with Wärtsilä’s Puregas CA technology for biogas upgrading and polishing, with a total methane loss of less than 0.1 percent, makes it extremely energy efficient.

The Puregas CA at Hjørring is equipped with the patented VAC (vacuum) option that offers greater flexibility in delivering heat to the upgrader, heat sources down to a temperature of 95 degrees C are possible to use.

The Hjørring plant transforms manure-based biogas into bioLNG, representing annual carbon dioxide (CO2) savings of approximately 41,000 tonnes when replacing fossil natural gas.

Biogas is a renewable energy source that can be stored, and it is of great significance as Denmark seeks to combat the effects of climate change. The trust and efficiency of the Wärtsilä solutions selected for our two sites is central to these efforts, said Allan K. Olesen, CEO of GrønGas.

Emergency support and service

The full Wärtsilä scope for the Hjørring installation includes the Puregas CA biogas upgrading and polishing unit, with the patented Wärtsilä VAC solution, the liquefaction unit based on Mixed Refrigerant technology, a 250 m3 bioLNG storage tank, bioLNG export station to tank-truck and instrument air.

Wärtsilä has a 24/7 emergency support agreement with GrønGas covering the Hjørring plant, and a service agreement covering the 24/7 on-call, maintenance, and optimization of the Vrå plant.

We at Wärtsilä are proud to contribute to a decarbonized future, and we congratulate GrønGas on the opening of this important new plant. Their plants are doing a great job in reducing greenhouse gas emissions, and we are pleased to support them. Our biogas solutions are designed to take advantage of energy integration, which optimizes their performance and minimizes the overall energy costs, said Goran Gajski, Sales Manager Biogas, Denmark/Norway, Wärtsilä Gas Solutions.

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