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Deaeration

Air removing solutions to meet the needs of different paper grades and forming concepts

Valmet offers both passive and active deaeration solutions to meet the varying needs of every papermakers, designed for different paper grades and forming concepts.

Passive deaeration

Valmet OptiDeair Flume wire-water channel removes free air and other gases from the wire water more efficiently than a conventional wirewater silo. Developed to meet the challenges of higher gas content resulting from high-speed forming sections, OptiDeair Flume enhances papermaking efficiency as a pre-deaerator before a deaeration tank or as the only deaerator where vacuum deaeration is not required. By reducing process volume, deaeration facilitates faster process changes resulting in lower costs related to grade changes.

Active deaeration

Active stock deaeration is needed on all high-speed paper machines and is recommended in fourdrinier and hybrid machines in which mechanical pulp and calcium carbonate fillers are used. The OptiDeair Tank deaeration tank ensures maximum free and dissolved gas removal efficiency when treating wire water or headbox stock. By eliminating pressure and consistency variations and providing paper machine with clean stock, OptiDeair Tank ensures stable process conditions for targeted paper quality. Stock or wire water is fed to the vacuum deaeration tank where virtually all dissolved gas and gas bubbles are boiled off. To intensify the deaeration process, stock or wire water is sprayed through jet nozzles onto the roof of the tank thereby enlarging the gas removal surface area.