Pulp Paper & Logistics


VALMET 23 Proven benefits


ImpBin technology ● Impregnation at low temperature and for a long time


Two-vessel system concept ● Low cooking temperature ● Enables liquor-to-wood ratio control ● Enables black liquor recirculation for high yield ● Concurrent operation


Jonas Saetherasen led the project team that developed the third generation of CompactCooking


also easier to maintain, providing reduced maintenance thanks to a new, more cost-effective layout and by replacing high pressure feeder with pumps.”


Improved steaming and washing The new CompactCooking has a more efficient steaming process than its predecessor, allowing for much better conditions for the impregnation process. The washing performance has also been improved. The pulp from the digester is cleaner, so there is less demand on downstream processes. “The chemical consumption in the bleaching plant will decrease due to the more efficient washing. Our development work has led us to focus on the subsequent processing steps as well. When continuous cooking works really well, it positively affects the processes that follow,” says Saetheråsen. Even the name –


CompactCooking – alludes to the fact that the cooking system is compact, with the third generation being even less space consuming. “CompactCooking is perfectly named. The new system is space- efficient and easy to maintain. The


“CompactCooking has been the obvious choice for a majority of pulp mills,” says Patrik Lidbäck, sales manager for CompactCooking


new layout minimises the cost of peripheral systems, such as pipes and platforms,” says Lidbäck.


Tailor-made solutions “CompactCooking is modular, and tailor-made to suit individual customer requirements. Some customers need an entire system, while others are simply looking to upgrade parts of their cooking plant,” Lidbäck explains. Flexibility is the keyword, and


the goal of the project team was to build a system that can be developed in collaboration with the customer.


“CompactCooking is prepared


to handle changes that may arise. For instance, the pulp mill might want to produce a new pulp grade, or to boost production as the mill scales up to achieve higher production,” says Saetheråsen. “The third generation of CompactCooking has built-in flexibility and can be adapted to meet the changes pulp mills will be facing.”


Multiple specialists involved The development work has involved many experts at Valmet. Jonas Saetheråsen led the project team that developed the third


Simplicity ● Few active components


Results ● High yield ● Low reject amount ● Low energy consumption ● Easy to maintain ● High availability


Next-generation performance improvements


Optimised bleachability • Improved alkali profile • Cleaner pulp at the end of the cook


Improved washing • Up to three radial wash zones


Improved flexibility • Three cooking zones • Possibilities to adjust temperature and alkali charge throughout the cook


Improved maintenance/accessibility • Screen cleaning


Improved sustainability • Odor-free impregnation vessel • Connected to DNCG • Improved turpentine recovery for softwood


generation of CompactCooking. “We have very diverse skillsets within the project team: machine designers, plant engineers, process engineers, and staff from our laboratory among many


others. Everyone has contributed with their unique skills. Laboratory trials and simulations are crucial steps on the way to producing a new product or a new process at an industrial scale,” he says.


January/February 2019


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