Valmet has received an order from Stora Enso to modernise the circulating fluidised bed (CFB) boiler at theOstrołęka pulp and paper mill in Poland. The upgrade will enhance boiler availability, reduce unplanned downtime, and lower operating costs
The order reflects Valmet and Stora Enso’s long-standing cooperation at the Ostrołęka mill. Since delivering the original CFB boiler in 2010, Valmet has supported the mill through lifecycle services and modernisation projects to maintain reliable, cost-effective operation. This latest investment supports the mill’s continued efforts to increase refuse-derived fuel (RDF) use while improving boiler availability and operational performance.
Upgrade supports reliable operation with higher RDF use
Valmet’s delivery will include replacing the boiler bottom, an upgraded coarse material removal system, and a new bottom ash sieving system. The delivery also includes two years of spare parts to support a smooth start-up and long-term operational performance.
Przemysław Niedźwiecki, engineering and investments manager, Stora Enso, said, “Circularity and resource efficiency are central to Stora Enso and the Ostrołęka mill. As the boiler’s use of refuse-derived fuel has increased, new operational needs have emerged in the bottom ash area. This upgrade is expected to improve boiler availability, reduce maintenance shutdowns, and lower operating costs through more efficient material handling and reduced sand consumption.”
Jouni Koskinen, senior manager, Rebuild and Conversion Technologies, Pulp, Energy and Circularity business area, Valmet, said, “As the share of refuse-derived fuel has increased at the Ostrołęka mill over the years, the operating conditions of the boiler have also changed. This upgrade addresses a specific operational challenge by improving coarse material removal and supporting more stable boiler operation. The project is a good example of how targeted lifecycle services and modernisation investments can help customers improve availability, reduce maintenance-related shutdowns, and maximise the long-term value of existing boiler assets.”
The order was included in Valmet’s orders received for the third quarter of 2026. The value of the order will not be disclosed. The upgraded equipment is scheduled for installation during the mill’s annual shutdown in June–July 2027.
