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Trondheim, NOR

Service, Overhauls & Retrofits, Plant Performance Upgrades


350'000 t/a

Energy recovered

district heat, electricity

Thermal energy

2 x 75.5 MWth

Increasing Thermal Output Boosts Plant Performance

In 1985 HZI (at that point still Von Roll Inova) built an WtE plant with two incineration lines in Trondheim, Norway. In 2007 the plant was refurbished, with a third line added. Since then, energy from the combustion process has been fed into the district heating network. Two years after the refurbishment the operator of the plant, Statkraft Varme AS, approached HZI again: the combustion systems for lines 1 and 2 no longer met the latest stability, emissions and availability requirements. They commissioned HZI to look into the different options for boosting the availability and performance of the first two lines and extending their service life. HZI process engineers did an on-site study to analyse the way the plant was operated and identify components and systems that were limiting performance. On this basis they drew up a modernisation programme for the two lines, which was subsequently given the go-ahead by the client.

Results / Solution

HZI’s work to modernise the two lines brought the plant’s technology right up to speed. HZI’s intelligent combustion control system (CCS) prevents CO spikes and automatically switches in the auxiliary burner if required. The temperature of the primary air can be increased sufficiently to keep combustion stable even at low calorific values. Flue gas recirculation combined with an SNCR (selective noncatalytic reduction) system minimises NOx emissions.


  • Statkraft AS

Time Frame

  • 2009 – 2010


  • New combustion control system
  • Renewing the primary air preheater and system
  • Upgrading the secondary air and recirculated flue gas systems and the jets
  • Installing the necessary electromechanical systems and channels
  • Upgrading valves in the boiler and the pressure maintaining systems
  • Function descriptions for the entire plant
  • Construction, production, delivery, assembly, inspection and commissioning