Alfa Laval decanter centrifuge reduces chemical losses in green liquor dregs
Södra Cell is one of the world’s leading manufacturers of market pulp. The company’s paper pulp production takes place at three mills in Sweden and two in Norway, with a total annual production volume that exceeds 2 million tons.DATE 2017-07-13
The mill of Södra Cell in Tofte, located at the edge of Oslo Fjord, produces around 400,000 tons per year of ECF sulphate pulp from a mix of softwood and hardwood (eucalyptus).
As part of the chemical recovery system, the plant was operating a vacuum filter for dewatering the green liquor dregs after the clarifier. The existing vacuum filter was limited in capacity and delivered a very low cake dryness of no more than 40 %.
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- Lower installation costs
- Higher chemical recovery
- Better ability to handle the sludge
- Lower sludge disposal costs.
After 15 months and 6,500 hours of operation, we have not yet had to open the machine. We’ll probably follow the Alfa Laval recommendations and plan a standard service of the machine after the first 8,000 hours.