Finland-headed energy and forest industry technology provider Valmet Oyj has announced that it has been selected by Swedish forest industry major SCA to supply a new wood powder fired lime kiln and a fiberline upgrade for the SCA Obbola kraftliner expansion project in Sweden.
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Founded in 1929, Svenska Cellulosa Aktiebolaget (SCA) has four pulp and paper mills in Sweden. In September 2019, SCA announced its plan to build a new paper machine for the production of kraftliner at its Obbola paper mill in Umeå.
Valmet’s delivery is part of SCA’s major investment to increase the annual production of kraftliner in Obbola mill from the current 450 000 tonnes to 725 000 tonnes per annum. The total investment amounts to SEK 7.5 billion (≈ EUR 700 million) over a five-year period.
With the investment in Obbola mill, we can meet the increased demand for sustainable packaging. We selected Valmet to deliver new technology for our pulp mill upgrade as we have had good experiences of Valmet technology at both our Obbola mill and other SCA mills, said Per Stand, Project Director, SCA.
Valmet’s delivery includes a new fossil-free lime kiln and an upgrade of the existing fiberline. The pulp production upgrades will happen in stages. The upgraded fiberline will start up in June 2021 and the new lime kiln is scheduled to start up during the last quarter of 2021.
Although the value of the order has not been disclosed Valmet indicates that a project of this size and scope is typically valued at around EUR 50 million.
Wood powder replaces oil-fired lime kilns
The new lime kiln system delivered by Valmet replaces two old oil-fueled lime kilns and will have a daily capacity of 220 tonnes burned lime. The solution includes OptiDisc Lime Mud Filter, Flash Dryer for lime mud drying, high-efficiency Rotary Cooler and a full Wood Powder Firing System for the lime kiln, including storage and grinding of wood pellets.
This solution makes the lime kiln 100 percent fossil-free. SCA also operates a wood powder fired lime kiln delivered by Valmet at its Munksund mill.
Fiberline capacity increases with improved washing
The fiberline upgrade includes a new hot stock refining after the digester using Conflo refiners. The brown stock washing will be improved by adding a new TwinRoll press as the last washing stage before the storage towers for the paper machine.
As a result of the fiber line upgrade, the daily capacity will increase from today’s 850 air-dry tonnes to 1 100 air dry tonnes. The capacity increase is done with improved washing with the same water consumption.
This order strengthens our cooperation with SCA. Delivering fossil fuel free lime kiln solution is very much aligned with the strategies of both our companies. SCA valued our technical leadership in lime kilns as well as robust and reliable solutions both for the lime kiln and fiberline, said Bertel Karlstedt, President, Pulp and Energy Business Line, Valmet.