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18 VALMET


Pulp Paper & Logistics


trouble shooting and process improvements, we have now taken a huge step toward the goal we set from the outset: a fossil- free kiln with great operational effectiveness and a low impact on the environment.”


Utilising bark in biomass gasification Unlike in wood powder firing, bark can be used as a biomass source in gasification. Biomass gasification is a combined system of biomass dryer, gasifier and lime kiln, optimised for burning the product gas. After drying, bark or other wood residue is gasified in the CFB gasifier at high temperatures using a controlled amount of air. The resulting product gas is then burned in the lime kiln burner, which is optimised for product gas. “One of the challenges is


controlling the whole process,” November/December 2019


explains Juhani Isaksson, business development manager for gasifiers at Valmet. “Bark is not a uniform fuel, and it is important to understand how the process should be controlled and optimised. This is where Valmet’s


complete understanding of the process from the dryer, gasifier and lime kiln operation comes into its own.” Valmet has delivered four


gasifier-lime kilns for pulp mills, one of the first to be


implemented being at Metsä Group’s Äänekoski bioproduct mill.


“Bark-derived product gas is


produced for the bioproduct mill’s lime kiln,” says Ilkka Poikolainen, vice president of the


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