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Pulp Paper & Logistics


drawn sketches, Canfor chose to upgrade the #1 press first so they could bypass it if there was a problem. The contract with ANDRITZ was signed in January 2013.

With field measurements in hand, the team at the Delta Service Centre began producing working drawings and fabricating the unit. When the equipment arrived at the mill in July, the transformation of the wash press began. The feed system was converted from corner feed to centre feed. The wash zones were added and the low consistency feed assembly was installed. The installation took six days. “Based on what we know now, and with our planned fabrication improvements, we think we can do the next one in four days,” Hallas says. “We explored an innovative

new option with ANDRITZ and then watched it materialize into exactly what we needed,” Parfitt

consistency (6-11 per cent) as well. The centre feed design distributes

the pulp more uniformly than the corner feed design of the original press. It also allows for higher feed consistencies. The pulp enters the press higher on the press roll, utilizing more of the screen area for dewatering. There are two locations for introducing wash water, and there are multiple nips. These features all contribute to higher washing efficiency. How much higher? About 18-24 per cent improvement. If additional capacity is needed, an improvement in the neighbourhood of 28 per cent is possible.

From sketch to r eality in 18 months Since this was the first-ever Mult- E-Nip upgrade, and their first look at it was through Hallas’ hand-

says. “We were on the edge of our seats when it started up. It was exciting to be a part of it.” From ANDRITZ’s side, the

evolution of the product – from a conceptual sketch to actual installation to excellent results all within 18 months – was also exciting.

A partnership as promised “We entered into this partnership with ANDRITZ cautiously based on our experiences with other suppliers,” Parfitt says. “But coming out of it, I have to say I am very pleased. ANDRITZ stayed with us until the press ran beautifully.” The mill has evaluated the

E10, displacement ratio, and all the criteria that are part of the performance guarantee. “We are seeing improved displacement ratio, improved E10, and improved operability of the press,” Parfitt says. “Before the upgrade, we had trouble with

plugging headboxes and things like that. We now run at higher feed consistencies and have no plugging. The press just runs. We don’t have to babysit it.” A big part of optimization is sharing data with operators so they can know just how far to push the press. The upgrade offers considerable flexibility, so the mill is running bump tests to understand the impact of feed consistency, the split of wash water between the two zones, and torque settings to get good discharge consistency. “This year, we have big projects in the green energy area that are consuming capital, but I’m very sure we will upgrade POW #2 next year,” Parfitt says. “Our sister mill (at Northwood) is also evaluating a Mult-E-Nip upgrade. Looks like we will see our friends from ANDRITZ around here for a while.” More information from Greg Hallas at ANDRITZ. Email: greg.

Greg Hallas of ANDRITZ (left) with Canfor Pulp’s Kelly Parfitt, who says: “We explored an innovative new option with ANDRITZ and then watched it materialize into exactly what we needed.”

May/June 2015

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