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Pulp Paper & Logistics


VALMET 19


Äänekoski bioproduct mill. “This is one example of solutions which enable the mill to be fully free of fossil fuels. “In these projects we have


proven that lime kilns fueled with gasified biomass is safe and


works well. We have achieved more than 100 per cent of the design capacity, our customers have been able to operate with 100 per cent gasifier gas, without support fuel and have reached good lime product quality of 2-4


per cent calcium carbonate,” Isaksson concludes.


Choosing the best alternative The driver for choosing a biomass-based system may be


the company’s commitment to reducing carbon dioxide emissions or the availability of suitable biomass as a byproduct of mill operations. In recent years, Valmet has delivered both gasification and wood powder solutions for new mills and rebuilds. “The best solution and the business case has to be evaluated each time, based on the available biomass, kiln size and possible bottlenecks in the process. Gasification is the right solution for mills with a large or medium-sized kiln and which have bark at their disposal, while wood powder firing is most suitable for smaller kilns,” Jensen-Holm explains. It is also possible to convert


existing fossil fuel kilns to use either wood powder or gasification, but it must be acknowledged that replacing the kiln fuel may impact kiln design and operation.


November/December 2019


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