LC-pulping system for recycled paper with predictive control of the detrashing

Continuous LC-pulping of OCC involves not only defibering, but also removal of the coarse contaminants contained in the waste paper. The interaction of both processes requires complex measures.

BluePulp LC, Voith's innovative pulping system, accomplishes this task with an optimally coordinated interaction between continuous pulper and cyclically operated disposal. In the presentation, the process is illustrated with the help of a video simulation that details the process steps of heavy parts separation, pumping to the IntensaMaXX detrashing machine with accumulation, washing and reject removal, as well as the final stage of the drum screen with complex water application.

BluePulp LC, which succeeds the proven TwinPulp system, is equipped with the predictive control OnC.Pulping D (detrashing), which dynamically controls the detrashing process. An algorithm indirectly analyzes the level of contaminants in the pulper. Typical operating values, such as power consumption and accept flow rate, provide the program with information about the current contamination level of the recovered paper fed in. Based on the data, the cycle times and throughput rates of the detrashing machines are automatically set to the optimum. Compared to static setpoints, this dynamic operating method can significantly improve fiber loss, energy and water consumption. In addition, machine wear and maintenance requirements are greatly reduced.