• Swiss Krono - Heiligengrabe

Aalborg Energie Technik a/s Biomass Combined Heat and Power Plant

Swiss Krono, Heiligengrabe, Germany

At the Swiss Krono site there is a biomass-fired combined heat and power plant (Energie Anlage 3).

The combined heat and power (CHP) plant generates 20 MWe of electricity, and supplies the MDF and OSB manufacturer with heated thermal oil and flue gas for the drying process.


Besides traditional wood chips, bark, sawmill residue etc., the plant has extensive experience of combustion, using a wide range of A1 - A4 fuels:

  • MDF-granulate from chipboard manufacturing
  • Sander dust with very high N-content
  • Composted wood with up to 25% ash/inert material
  • Fuel from external sources.

The plant utilises 130,000 tonnes of waste wood annually.


The plant was handed over in 2003.


High Availability

In 2013, the availability was measured to 95% (8,300 hours) for the full CHP plant (latest available figures).


Regular AET Services and Improvements

Swiss Krono and AET have a fruitful, close cooperation:

2004 → :    Regular inspection

2004:          Began utilising A3/A4 fuel, which required Inconel in the furnace

2007:          Due to A3/A4 fuel an AET SNCR DeNOx plant was installed

2015/2017: Change/extension of superheaters

2016:          Change of grate carpet and Inconel upgrade

2017:          Repair of furnace walls.

2018:          Installation of new safety PLC.


AET designed, supplied, constructed and commissioned the following scope:

  • Fuel storage and handling
  • Fuel feeding and dosing system
  • AET Dust Firing System
  • AET Combustion System with AET Spreader Stoker and AET BioGrate
  • AET Biomass Boiler with superheaters and economisers
  • AET Combustion Air System
  • AET SNCR DeNOx System
  • Feed water system
  • Water treatment system
  • Ash handling system
  • Bag filter and lime injection system
  • Flue gas cleaning and stack
  • Piping and ducting
  • Engineering of turbine, ACC and turbine hall
  • Optimisation of heat balance
  • Electrical installations
  • Insulation
  • Boiler house steel structure
  • Platforms and stairs
  • Instrumentation
  • PLC control and SCADA system for the entire plant.

Additional Information

  • Swiss Krono - a successful manufacturer of wood-based products: Read more
  • To obtain more information about this biomass-fired plant and about AET: Contact AET Sales.
Boiler: 64 MWth
  70 bara
  452 °C

Electrical power:

≤20 MWe

Process energy:

≤10 MWth

The Swiss Krono CHP plant produces 20 MWe electricity and 10 MW process heat.

A 3D view of the AET Biomass Boiler plant.

Zignago Power - successfully producing green energy in Italy
The 49 MW AET Biomass Boiler at the cogeneration plant in Italy is owned and managed by Zignago Power, belonging to the Marzotto family empire, has since its installation in 2013 been running with a very high availability (98,8%). The plant utilises wood residues and agricultural waste such as straw, mischantus and maize >Read more
Zignago Power - successfully producing green energy in Italy
  • Aalborg Energie Technik a/s
  • Alfred Nobels Vej 21 F
  • 9220 Aalborg East, Denmark
  • Tel +45 96 32 86 00
  • aet@aet.dk

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