Fortum_Vaertaverket_01

The icing on the cake

Stockholm’s Environmental Masterpiece

One of the world’s largest biomass projects has recently started up right in the center of Sweden’s capital, Stockholm, helping it on its way to become Europe’s most environmentally friendly city. ANDRITZ played a major role in creating Stockholm Exergi AB´s (former Fortum Värme) showcase Värtaverket biomass CHP plant.

spectrum35_vaertaverket_002

“To get the capacity we needed, we had to install a very large boiler. That meant height as well as width when it came to capacity."

MATS STRÖMBERG
Senior Project Manager, KVV8

The locals call it the “Wedding Cake” due to its multi-tiered form sitting quietly and unobtrusively along the cityscape of Stockholm. While certainly impressive on the outside, this terracotta clad masterpiece of design also holds something truly remarkable within – one of the world’s largest biomass boilers, which, along with some of the most modern technology available, ranks it among the most productive and efficient facilities to be found anywhere today.

And this growing city certainly needs a large, efficient, and productive boiler; Scandinavia in the winter can be a very cold place and Stockholm’s 1.5 million residents need full on, 100% reliable district heating to enable them to live and work in the city.

The new plant is fueled entirely by biomass, which comes in chip form from all over Sweden and further around the Baltic region. Mats Strömberg, Senior Project Manager for the KVV8 project says, “Not only is this one of the largest biofuel projects in the world, but we have built it in a tight space, right in the heart of the city, with a lot of the main moving parts and supply systems situated way underground.”

 

spectrum35_vaertaverket_003

Carefully built around three protected ancient oak trees, the uniquely impressive design of the boiler house at the Värtaverket site has recently been shortlisted in a global prestigious design awards.

© Riku Isohella

A BIG STEP TOWARDS A FOSSIL-FUEL FREE CITY

The Värtaverket KVV8 project has become a major milestone in the Stockholm Exergi AB - Stockholm city strategy of reduced emissions – the new facility has reduced CO2 emissions by an incredible 126,000 tonnes per year and 650,000 tonnes per year including the impact from the electrical production.

With a total investment of 500 MEUR, ANDRITZ was awarded the contract for the boiler and all automation at the plant in December 2012. Bernhard Haimel, Project Manager for ANDRITZ, explains, “We were delighted and proud to win this order; there was a lot of work involved in the quotation process. Our aim was to convince that we were the right supplier for the job.

“This was a unique project in many aspects, particularly the manufacture and installation of one of the world’s biggest boilers, with a biofuel fed Circulating Fluidized Bed (CFB) and an output of 345 MWth. What was particularly difficult in this case was that we had to fit the boiler into a limited space at the same time as apply the very best technology for efficiency, including the need for fuel feeding via six spouts to ensure even distribution of the biofuels, one of the prerequisites for the lowest possible flue gas emissions.”

And the icing on the cake? “The environmental data from this plant is very, very good,” says Strömberg. “The contract we made with ANDRITZ stated that the emissions need to be much lower than government regulations, and they have achieved this and more. The success of the Värtaverket KVV8 project means we are a big step on the way to creating a fossil fuel-free city.”

 

Much like catching and using the steam generated from a boiling kettle, the technology at the Värtaverket site has been designed for maximum output, and to use and reuse any steam, heat or power to achieve extra efficiency wherever possible.

© Riku Isohella

A hole was blasted out of the rock to a depth of 40 meters.

© Riku Isohella

TechNews: A-Recovery+ chemical recovery concept

allows mills to see the chemical cycle in a new light. Over the years, chemical recovery technology suppliers have worked with pulp mills to “close” the chemical recovery loops in order to reduce emissions and effluent – and also to increase recovery efficiency. These loop closures have sometimes led to a build-up of certain chemicals and the creation of side streams that are either ignored or disposed of.

Read more

OKI: All set to take on the world

Asia Pulp & Paper (APP) has often made it abundantly clear that its ambition is to be the No.1 supplier of pulp and paper around the world. The company’s latest 2.8 million tonnes a year pulp development, OKI, is a signal that those ambitions remain firmly in place. ANDRITZ supplied what is now the world’s largest recovery boiler to the mill, which is right at the center of the greenfield development in the province of South Sumatra, Indonesia.

Read more

The Icing on the Cake

Värtaverket biomass CHP plant has started up in Stockholm.

Read more

Riikinvoima: If you go down to the woods today ...

The classic children’s nursery rhyme continues … “you’ll be in for a big surprise”.

Read more

Tembec: Red liquor. Green power.

The new ANDRITZ SulphitePower recovery boiler improves production costs and environmental performance at Tembec in Canada while providing steady, long-term revenue for green electricity.

Read more

A world-class Recovery

After an explosion hit the boiler in Pöls it needed a total replacement. ANDRITZ accepted the challenge.

Read more

Read SPECTRUM customer magazine

Success stories of several projects in the pulp, paper and power industry.

Click here

Meet our experts and get in contact! Visit us at Trade fairs!

We look forward to meeting you personally on our booth and enjoying interesting discussions on the subject of thermal power business.

Read more