PGE/REWE 2015

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Experiences from Biomass Boiler Plants in UK (Room G109, Auditorium Centre, First Floor)

09 Jun 15
2:00 PM - 3:30 PM

Tracks: Theme: Coal's Cleaner Future, Theme: Renewable Energy Strategy, Business & Integration

Biomass plays an important role in contributing the 2020 renewable energy targets in UK. One of the biomass projects implemented in UK is the biomass power plant built by Iggesund Workington to generate steam to a paper mill and also 50 Mwe of green electricity. The contract for the BFB boiler was signed April 2011 and resulted in handing over in May 2013. The BFB boiler has fuel input of 148 MW and it produces 195 t/h steam at 540 C temperature and 102 bar pressure. The fuel in Iggesund is virgin wood in the form of bark, chips and saw dust. Start-up fuel is natural gas. Since commissioning the boiler has been contributing radically to the decrease of carbon footprint of the mill which has come down from 1100 kg/T down to close to zero with green energy offsets. During operation the boiler has filled the plentifully the required performance and shown high availability and reliability in operation. The time efficiency of the boiler plant has been more than 99,7% in 2014. The key issue in boiler performance is the biomass fuel handling, which also usually plays major part in the possible disturbances in boiler operation. Another BFB biomass boiler plant supplied by Andritz in UK is located in Blackburn Meadows and owned by EON. Contract was signed July 2011 and biomass firing started in May 2014. The fuel in this plant is recycled waste wood with fuel input of about 97 MWth. Boiler produces 119 t/h of steam at 85 bar pressure and 487 C temperature. Plant generates 30 Mwe of electricity and district heat to consumers. Waste wood is more challenging fuel as compared to virgin wood bringing the challenges with impurities as metals, stones, plastics and above all heavy metals in these into the process.