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SCA Pulp, Sweden Orders a Major Disc Filter Rebuild from ANDRITZ

The capacity of the disc filter supplied by the international technology group ANDRITZ will be tripled to reach 900 bdmt/d.

October 8, 2021

SCA Mill
SCA Ortviken mill in Sundsvall, Sweden

ANDRITZ has received an order from SCA (Svenska Cellulosa Aktiebolaget) to rebuild a disc filter at their pulp mill in Ortviken, Sundsvall, Sweden.

The production capacity of the disc filter (originally supplied by ANDRITZ) will be tripled to reach 900 bdmt/d following the rebuild. The filtrate flow will be increased to a maximum of 130,000 l/min. Further, the refurbished disc filter will ensure the requested throughput at different beating degree levels, ranging from 300 to 700 CSF, for the production of various high-quality pulp grades. The startup is scheduled for the fourth quarter of 2022.

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The scope of supply comprises the main disc filter components, such as a new hollow shaft with high-volume filtrate channels – the largest-volume filtrate channels ever designed for an ANDRITZ disc filter, 396 ANDRITZ SuperFlow sectors for 22 filter discs with customized filter bag, a state-of-the-art disc guiding system and a new filtrate valve with automated adjustment to the different beating degrees. Additionally, it will also include a new knock-off and cleaning shower systems, and a new repulper screw.

The on-site services for installation and start-up as well as supervision of start-up will be provided by ANDRITZ.

ANDRITZ has developed a new filter bag solution able to handle beating degrees above 600 CSF. The new development was tested on a full-size disc filter during a 3-day trial at the ANDRITZ pilot plant in Graz, Austria. This was the first time that a single disc filter could be operated at such a wide CSF range.

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The disc filter rebuild order is part of SCA’s ongoing project to transform the existing TMP (thermo-mechanical pulp) line at the Ortviken site into a CTMP (chemo-thermo-mechanical pulp) plant with an annual capacity of 300,000 tonnes per year.