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HZI selected for Danish biogas upgrading project

HZI selected for Danish biogas upgrading project
HZI Biomethan GmbH has been selected to supply a membrane upgrading system to KW Energi A/S biogas plant in Gråsten, Denmark (photo courtesy HZI).

Swiss-Japanese cleantech company Hitachi Zosen Inova AG (HZI) has announced that its Germany-headed wholly owned subsidiary HZI BioMethan GmbH has been selected to deliver a biogas upgrading unit to Denmark. The client is a farmer from Gråsten in the south of the country who is upgrading his existing biogas plant to generate energy more flexibly in response to market demand.

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Located just some 20 km north of the German border city of Flensburg, the operating company KW Energi A/S has been treating organic waste and agricultural residues by anaerobic wet fermentation to produce renewable electricity since September 2018.

Now the capacity of the biogas plant is to be increased and a membrane system to be added to clean and upgrade the biogas into biomethane that can be fed into the regional gas grid.

Popular technology for gas independence

Gas upgrading specialist HZI BioMethan designs and manufactures both amine scrubbing and membrane systems at their premises and own production facilities near Hamburg, Germany.

Given the recent efforts of European countries to become independent of Russian gas supplies, there is currently an increased need for alternatives to energy procurement and generation, for which the HZI Group provides a broad spectrum of technologies, remarked Jens Becker, Managing Director of HZI BioMethan.

For the project in Gråsten, the membrane-based gas separation process will be used to separate the carbon dioxide (CO2) and methane contained in the raw biogas. The result is biomethane, aka renewable natural gas (RNG).

The model M900 membrane system will have a raw gas upgrading capacity of 900 Nm³/hour.

In addition to the high-performance, economical plant technology in standard design, including service and maintenance services, HZI’s successful bid was also down to a short delivery time.

Standardized offering shortens lead time

Despite obstacles posed by the current global situation, work on the project is proceeding to schedule, with a factory acceptance test scheduled for the membrane system at the beginning of October.

The plant is due to be commissioned in mid-autumn, with plans to feed the first gas into the grid at the end of November 2022.

For many reasons, biomethane plants are attracting growing interest. For example, they also provide ways of decarbonizing the transport sector. Not least with this in mind, we’ve standardized our plants in recent years and reoriented our manufacturing and warehousing, said Jens Becker.

Among other things, stocks have significantly increased. As a result, components and plant parts whose delivery is sometimes impaired by the effects of the coronavirus pandemic and the war in Ukraine are currently available.

Standard plants and plant assemblies are also being pre-produced. This enables the company to continue to offer short delivery times when supplying installations of this sort.

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