The primary function of a wire and press section in a paper machine is to remove water from the paper sheet. Each vacuum element in the machine, such as a suction box or a suction roll, requires a certain amount of air flow to operate at an ideal vacuum level i.e. at the minimum to maximize the energy efficiency while maintaining the runnability and dewatering capacity. The needed capacity is dependent e.g. on felt life and type, paper grade, basis weight, machine speed, etc. In order to understand the effectiveness of individual elements (such as save-all pans and suction boxes) of a wire and press section, the dewatering rate must be measured. Without this, critical air flow (i.e. vacuum level) review and consequent optimization cannot be successfully carried out. Water removed from the paper sheet contains air and is often subject to foaming. Traditional magnetic liquid flow meters demand a homogenous flow and will not be able to provide accurate data.
Runtech’s Ecoflow dewatering meters are designed to measure water flow across a mechanical restriction and are not sensitive to entrained air or foaming. These devices are used both under vacuum (in a separator drop leg) and in atmospheric conditions. EcoFlow dewatering measurement system optimizes dewatering and vacuum levels in the forming and press sections. EcoFlow provides maximized sheet dryness after the press section, improved machine runnability and maximum energy efficiency, while providing papermakers with accurate real-time feedback about the dewatering performance along the paper machine.
Our main target is to bring notable energy savings and highly improved process efficiency
EcoFlows are designed to work with doctoring to gain maximum energy efficiency. Dewatering and doctoring are not only related to energy consumption, but they also have big effect on whole machine runnability, efficiency and profitability, as well as the paper profiles. A well-designed and operated dewatering and doctoring system is one of the key issues to a well-performing and energy-efficient machine. A lot of paper machines have them but they are not effective and do not have the adjustability that is needed to optimize them effectively. In order to get the full benefits from increased dewatering, an online dewatering monitoring, efficient water discharge and rewet prevention are necessary. Runtech Ecoflow save-alls and double doctors can perfectly match these needs.
