TECHNICAL INSIGHT
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2 1. EP Turbo Blower is a key element in the RunEco solution. 2. Operating window comparison.
Towards energy-efficient and economical Tissue production with RunEco solution Article by Tero Pärssinen, Technical Director, Runtech Systems
Runtech RunEco solution is a fully adjustable, energy-efficient vacuum system for tissue production. It is a tailor-made solution equipped with optimal save-all and doctoring system and online dewatering measurements. RunEco can provide energy savings of 30 to 70%, and is applicable for both greenfield and rebuild projects.
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acuum, 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. Historically, it has been excessively used. With today’s increasing cost of energy and environmental awareness, paper mills are demanding reduced specific energy levels and operational costs to help with their competitiveness. Runtech 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. Tra-
ditional 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.
RUNECO SOLUTION – OPERATING PRINCIPLES There are some principles, which govern the content and operation of an efficient and ecofriendly 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. Vacuum is created as a result of moving air across a restriction. Fans, turbo blowers and liquid ring pumps can each be used to achieve this goal and are also often used in combination with each other. Turbo blowers have the benefit of being an inherently efficient way of
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