Vacuum, which is a result of air being pulled through a restriction, is an expensive tool; it is one of the top three energy consumers in a paper mill. Runtech’s RunEco vacuum system is developed especially to take into account the challenges and demands related to the dewatering and runnability of paper and board machines. Traditional method of increasing vacuum levels is replaced with speed adjustable turbo blowers, optimal doctoring and save-all systems with online dewatering measurements. By using only the needed vacuum in the critical consumers, mills can fully benefit from the more efficient nip dewatering strategy and save energy.
There are some principles, which govern the content and operation of an efficient and eco-friendly paper machine vacuum system. The primary function of a wire- and press section i.e. the removal of water needs to be carried out effectively and reliably. This requires speed-controllable turbo blowers to create the needed optimal vacuum level, robust dewatering equipment such as save-alls and doctoring and means to measure all this reliably to get the feedback for the energy-efficient control of the system.