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INDUSTRY
IGELSTA COMBINED HEAT AND POWER PLANT,
SÖDERTÄLJE SWEDEN IGELSTA IS NOW THE COUNTRY’S LARGEST BIO-FUELLED CO-GENERATION PLANT – PRODUCING BOTH HEAT AND POWER FROM LOCAL RENEWABLE SOURCES OF ENERGY AND WASTE.
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Since it came on stream in 1982, the Igelsta power plant in Södertälje has undergone several improvements to reduce its environmental impact and convert its three boilers to a largely renewable fuel supply. But WSP has been part of completing its most dramatic upgrade yet, building an entirely new combined heat and power (CHP) plant which produces heat as well as electricity for more than 100,000 homes.
CHP technology burns fuel to create electricity, capturing the waste heat and supplying it to the district heating system. “It’s an extremely efficient process,” explains Staffan Dyrsch, Project Manager at WSP. “It offers a low-cost, secure supply with minimal environmental impact. We believe that electricity generated by the new CHP plant will save 450,000 tonnes of carbon emissions each year by replacing coal and oil-based imports.”
The new plant, worth SEK2.4bn, consists of one large, 3,000-tonne boiler, 50m tall, which hangs from the roof of a new 63m-tall boiler house. A WSP team encompassing many disciplines was responsible for every aspect of the building works of the entire plant, including project management, construction design, designing the HVAC and electrical systems, fire and risk, acoustics, landscape design and cost calculations. The team was also responsible for construction management and installation coordination for the new structures.
In total, there were more than 55 separate contracts, with more than 500 workers on site at the project’s peak. In total, 13,000m3 of concrete and 1,400 tonnes of steel were used. “It was a very large, very technically complex project,” says Dyrsch. “We designed almost everything, including an extension to the harbour, the foundations for the fuel transportation system and the 110m-tall chimney, and pump houses, retaining walls, silos, the electrical building and the offices. All of the drawings were done in 3D using TEKLA.”
The project not only involved much complex engineering, WSP had to consider the aesthetics too, working with architect Scheiwiller Svensson Arkitekter. “The colour scheme is red, grey and black, both inside and out,” says Dyrsch. “It was very important for the client that the plant be a landmark, so we did a lot of work to make it look good.”
SEK 2.4BN
Largest project of its kind that WSP has undertaken
QUICKFACTS CLIENT Söderenergi
PROJECT TEAM WSP office: Sweden; Architecture: Scheiwiller Svensson Arkitekter PROJECT VALUE SEK2.4bn
SERVICES PROVIDED Structural, project management, HVAC, electrical, fire risk, acoustics, landscape design, cost calculations, site supervision, building control
STATUS Completed in December 2009
PROJECT SUMMARY This complex project involved design of a CHP plant, including boiler house, buildings for the generator, turbine and flue gas cleaning/particle filters, together with ash silos and a new office building. The project also included conveyors, silos and a new harbour for the biofuel
KEY CHALLENGE All drawings for structure, pipes and processes were done in 3D. Construction drawings were developed using TEKLA
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