Kemi
Kemi will lead the way far into the future
Kemi bioproduct mill builds on the experiences and insights gained from Äänekoski bioproduct mill while further developing the Metsä Fibre bioproduct mill concept. Metsä Fibre’s bioproduct mill concept uses world-class technology to minimise the environmental impact of operations.
Best available technology Pekka Kittilä , Technical Director of the Kemi mill project, points out that continuous improvement is an integral element in Metsä Fibre’s mode of operations. Kemi mill is being constructed with the best available technique (BAT) and in some cases, using even more advanced technique. The mill meets the requirements in the EU’s relevant reference documents (BREF). World-class techniques helps minimise the environmental impact from operations. Product gas made from tree bark replaces fossil fuel in the lime kiln. The mill is on target to achieve extremely low water consump- tion. Water intake is lower than that of the current Kemi pulp mill, even though production will increase 2.5-fold. In pulp mills, excess heat from production has usually been dispersed into waterbodies, but Kemi has a closed cooling water cycle, which holds water consumption at an extremely low level. Another example of its advanced technique is the in-house sulphuric acid plant, which will use sulphur compounds from the mill’s odorous gases, reducing sulphate emissions.
Metsä Fibre is renewing its mills in line with a unique bioproduct mill con- cept that takes resource efficiency and sustainability to an entirely new level. The concept combines efficient raw material use with energy and environmental efficiency. Äänekoski bioproduct mill, which started up in 2017, was the first mill to adopt the concept. Kaija Pehu-Lehtonen , SVP, Business Development of Metsä Fibre, says the concept was found to work well in Äänekoski and is now being introduced and refined in Kemi. “You always learn new things along the way, and we build on them in subsequent projects. The new Kemi mill is even more advanced in ener- gy, resource, and environmental efficiency,” she says. The bioproduct mill concept is based on the concept of using the wood raw material and production side streams 100 per cent in the form of bioproducts that can replace fossil materials and fuels. As well as pro- ducing 1.5 million tonnes of softwood and hardwood pulp every year, Kemi bioproduct mill makes tall oil, turpentine and bioenergy. The pro- cess also generates product gas and sulphuric acid, which can be used in production.
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