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Case

CHP

District energy

District heating

Växjö 40MW/65MW CHP plant

1. May 2015

Solution provider

Ramboll

Ramboll is a leading international architecture, engineering, and consultancy company, owned by the Ramboll Foundation.

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Växjö: A 80,000 citizen city in southern Sweden, is striving to become one of the greenest cities in Europe. The city’s new bio-fuelled CHP plant, Sandvik, was recently inaugurated. It has been pivotal in the city’s attempt to meet the future energy demand in a sustainable fashion.

A challenging project
Ramboll has been responsible for the biomass boiler, flue gas treatment, balance of plant, and steam turbine. The project encompassed all phases from procurement of the major components, monitoring of manufacturing, erection and commissioning, to commercial operation and guarantee test.

The expansion represented the largest investment in Växjö’s history. And an investment project of this size does not come without a challenge or two.

"The erection phase lasted several seasons, and heavy weather conditions could close down the construction activities for periods. Planning the time schedule required a certain margin for these external risks and stresses. Also, expanding a power station that is in full operation took some extra care to avoid disturbance during tie-in and future operation", explains Nils F. Forsberg.

The project manager adds that a project of this scale also took strict coordination between different disciplines and cultures to keep the time schedule and meet quality demands. - I am happy to say that the construction phase was completed without any personal injuries, he says.

105 MW thermal power - fossil-free heat and power production
The new Unit 3 replaces the old oil-fired unit, Sandvik 1, and uses sustainable local fuels such as wood chips, bark, saw dust and branches, ultimately making Växjö’s heat and power production fossil-free.. It comprises external fuel handling, steam boiler, steam turbine, generator and flue gas cleaning, and the 105 MW of thermal power is distributed on approximately 40 MW of electricity and 65 MW of district heating. And it boasts an energy utilisation factor of 92%.

More information
For further information, please contact Nils F. Forsberg.
[email protected]