Pulp Paper & Logistics


PRODUCTS & SERVICES 23


Chip feeding digester bin operates without odours


The OptiBin functions as a buffer before the digester to remove air from the chips without creating odours and is the result of years of development aimed at a cost- effective solution with as few moving parts as possible. The first OptiBin was recently


A


started up at the Nordic Paper Bäckhammar pulp and paper mill near Kristinehamn in Sweden. Despite a very tight schedule, the installation and assembly of the chip bin exceeded expectations at Nordic Paper – everything had


new chip bin for digester chip feeding in pulp mills has been developed by Valmet.


to be completed during a regular eight-day mill shutdown. “The startup was very successful. We started production according to our schedule. What’s more, even the startup curve, with a gradual increase in output, followed our plans. A week after the shutdown, we reached full production,” says Jonas Lindqvist, deputy director of production and project manager at Nordic Paper. “There are still some residual points and, of course, some trimming to ensure that we achieve the goals we have set for the project.” David Elfman, sales manager at Valmet, added: “For us at Valmet,


Bäckhammar was the perfect partner for taking our new development into practice: partly because the mill is close to our development centre in Karlstad, Sweden, and also because we’ve always had a very good relationship with Bäckhammar.” OptiBin can be used in a number


of cooking processes. The design enables chips to flow smoothly and results in even pre-steaming and less runnability problems. Without good pre-steaming before cooking the cooking liquor will not penetrate the whole chip and results in uncooked chips. The flow design allows a cold top to be used. This means that


Valmet and Nordic Paper project representatives at the Bäckhammar pulp and paper mill


the bin itself will form a lid of chips that prevents gases from flowing to the atmosphere which results in less odour in the surroundings. Following the installation of the new chip bin, Nordic Paper estimates an increase in production of about 1,000 Adt/ yr. In addition, the OptiBin has led to substantial fibre savings, and a bonus for those living near the mill, who will not be exposed to malodorous emissions.


November/December 2014


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36