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Andritz to supply biomass boiler and process tech to Oulu mill conversion

Andritz to supply biomass boiler and process tech to Oulu mill conversion
Stora Enso is investing EUR 1 billion in the conversion of the remaining idle paper machine at its Oulu site in Finland into a high-volume consumer board line. In 2021, Stora Enso completed converting paper machine 7 into high-quality virgin-fibre-based kraftliner production (photo courtesy Stora Enso).

Austria-headed International technology group Andritz AG (ANDRITZ) has announced that it has received an order from forest industry major Stora Enso Oyj to deliver a new debarking line, a new biomass boiler, and upgrade of the recausticizing plant for its Oulu pulp and paper mill in Finland.

In October 2022, Stora Enso announced that it will invest EUR 1 billion to convert the remaining idle paper machine at the Group’s Oulu mill site in Finland into a high-volume consumer board production line as part of its growth strategy in renewable packaging by providing new volumes for growing packaging segments.

ANDRITZ has been selected to supply key equipment and processes to Stora Enso in Oulu.

The scope of supply, the value of which has not been disclosed, is on an engineering, procurement, and construction (EPC) basis, and includes:

  • New debarking line, equipped with digital Smart Wood Processing products, with a capacity of about 270 m3 solid wood over-bark per hour, providing excellent debarking results with very low wood losses.
  • New biomass power boiler with a steam production capacity of 216 t/h based on the high-efficiency ANDRITZ EcoFluid bubbling fluidized bed (BFB) technology, ensuring low NOx and other gaseous emissions.
  • Recausticizing plant upgrade for 5 000 m3/d white liquor production. The delivery includes new generation LimeLine recausticizing equipment such as LimeWhite-H filter maximizing the white liquor quality and minimizing effluent amount, and StiroX white liquor oxidizer.

According to ANDRITZ, this order “demonstrates the ongoing solid business relationship” between the two companies.

ANDRITZ also supplied production technologies and key process equipment to the Oulu mill for the first machine conversion from paper to kraftliner in 2021, which included the rebuilding of the fiberline and drying machine, as well as the modernization of the stock preparation system.

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