A BIT OF A SQUEEZE AND A DEMANDING CUSTOMER
The new, higher capacity boiler had to be squeezed into the existing building, which had to be completely repaired and made ready for what was to be a larger, and completely different shaped boiler. Mari Räsänen, Senior Project Manager, ANDRITZ, says, “The new boiler has 20% more capacity, which means increased dimensions of the boiler and its appending equipment, so engineering was complicated and modifications to the building had to take place.”
Bernd Zuschin, Senior Project Manager, Recovery and Power, for ANDRITZ says: “There were also a lot of unknowns; for instance, how secure and reliable were the foundations and overall structure? In the middle of all this was the fact that we knew from experience what a demanding customer Zellstoff Pöls is, particularly when it comes to mill standards and quality.”
The pressure test took place in early September 2015 and shortly afterwards the commissioning of the first systems started. As the main milestone for Zellstoff Pöls, the first liquor fireup was in mid-December. After an optimization period, the test run took place with no interruption from early January until the boiler was taken over by Zellstoff Pöls on the 6 February 2016 - not even 19 months since the contract signing.
“We had the perfect start-up; together with ANDRITZ, we broke the world record for a new recovery boiler”, says Gruber, “and we are amazed at how unbelievably stable the boiler is; we achieved 100% availability during the one-year observation period.”
And there have been other benefits; “We estimate that we have brought down our emissions by 40-50% with the installation of this new boiler,” says Werner Duer, Head of Recovery Line, Zellstoff Pöls.