Right after the manual cleaning session the steam production is about 18t/h, then after 2-3 weeks decreasing to 11-12 t/h.
In 2011, Vattenfall Vänersborg installed 2 pcs of 15MW boilers (bio-oil) supplied by Compab in cooperation with Robert Bosch A/S.
The problematic fuel meant that the boiler needed to be cleaned manually for every 14 days of operation
Mechanical cleaning was necessary several times per month – the pipes were not kept clean.
Before the boiler had to be cleaned every 6. week. The flue gas temperature was on a clean boiler 210°C
The boiler had to be stopped for cleaning every 700-1000 hours of work, depending on the duration of the voyage.