30 PROJECTS & CONTRACTS
Pulp Paper & Logistics
Upgrade for SCA’s Laakirchen magazine paper mill
W
ith the objective of increasing production and reducing
energy consumption, the PM10 paper machine at SCA Graphic Laakirchen in Austria recently had its press section modernised by Metso. With a width of 7.3m the
line produces uncoated wood- containing paper (SC-A) within a basis weight range of 45-60 g/m2 at the design speed of 1,600 m/ min, giving a capacity of 260,000 tonnes a year. “Our target was to increase
sheet dryness after the 3rd press for increased speed. We also wanted to reduce the draw and specific energy consumption and at the same time maintain the high quality level as before the rebuild,” said
production manager Andreas Vogel.
The project carried out by
Metso comprised a rebuild of the press section with a new SymBelt shoe press. It also included mechanical drives for the whole press section and an automation system upgrade for the shoe press. The SymBelt shoe press significantly increases sheet dryness which in turn reduces steam consumption, improves machine runnability, helps reach higher speed and increases production. SCA Graphic Laakirchen and
SCA Graphic Sundsvall are part of SCA’s forest products business area which produces publication papers – newsprint, SC and LWC paper – as well as pulp, solid-wood products and forest-based biofuels.
From left to right: Andreas Vogel (SCA Graphic Laakirchen), Pekka Petrilä (Metso), Johann Stadlmayr (SCA Graphic Laakirchen), Antti Rintala (Metso), Thomas Breiteneder (SCA Graphic Laakirchen) and Pertti Herranen and Mauri Laurikainen from Metso in front of the rebuilt PM10 press section.
Better control of steam by using ABB systems
The boiler house at the Stoneywood mill of Arjowiggins in Scotland has benefitted from improvements to its control system provided by ABB. ABB had already successfully
installed an 800xA system in 2008 on the mill’s PM08 paper machine so Arjowiggins engaged ABB to ensure continued reliability of the boiler house controls.
The 800xA system controls the amount of steam produced for use in the production of
September 2012
paper across the site, mainly in the drying sections of the four paper machines and in a turbine driving a generator producing electricity for the site. Continuous control of the boiler plant is necessary to ensure optimum steam production under extreme variations in load, such as during unscheduled interruptions to production or for maintenance. The control system must be able to accurately control the steam and electricity production under all of these varying conditions.
The boiler house 800xA system
was commissioned in January 2012 by John Dixon, who is a member of ABB’s UK Country Service Organisation, along with personnel from the Stoneywood site, led by Mill Process Control Engineer Niall Gairdner, who carried out all the preparation work and assisted with the testing and commissioning. Stoneywood Mill Development Engineer Ian Kilgour said: “All of us who were involved with the boiler house project were
impressed with John’s ability to interact with the plant operators and engineers. He was able to understand the difficulties the operators have had with the limited visibility and to propose new approaches to managing these issues. After working with the boiler house personnel he had sufficient data and knowledge to prepare, install and commission a ‘look-up table’ which allows the system to control the plant optimally at all points across the load curve. ”
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