30 PROJECTS & CONTRACTS


Efficiency system for Hamburger Rieger’s PM2 stock preparation unit


A


complete stock preparation unit has been ordered from Voith by Hamburger


Rieger for the new PM2 line it is constructing at Spremberg in Germany. Voith will supply three separate


stock preparation lines with a total capacity of 2,450 metric tons per day. Representing an investment of €370 million (US$422m), construction work started on Hamburger Rieger’s new paper machine following a ground- breaking ceremony last September. With an expected start-up date in June 2020, the 7.8m-wide PM2 will produce up to 500,000 tonnes a year of White Top Testliner in a range of grades. Voith says the key to the


stock preparation concept is its OnEfficiency.DIP (deinked pulp: recycled waste paper without colour residues) system, which has already proven effective for the manufacture of graphic papers based on recovered paper. The process is now being used for the first time in the production of packaging papers. In the stock preparation unit of the new PM2, ultra-modern sensors and actuators ensure consistent raw material quality and low running costs. The system consists of two yield


control modules, two bleach control modules and a optimiser. The yield control module uses online sensors to measure the ash content and whiteness of


January/February 2019


Pulp Paper & Logistics


Other news


● Valmet and Mercer Group have signed an agreement for on-line performance monitoring for nine Valmet TwinRoll wash presses at the Mercer Stendal mill in Germany. The agreement is valid for one year, with the option of being extended. During this period, Valmet and Mercer will co-operate to further develop fleet management with respect to predictive maintenance and reliability. “This will allow the Stendal mill to monitor performance, which will hopefully result in more uptime as well as savings on chemicals,” says Dr Gerhard Wulf, technical manager at Mercer Stendal.


the stock. Using actuators, the flotation technology automatically adjusts it as necessary to obtain the required degree of whiteness. The bleach control module also measures the whiteness before and after a bleaching step. If necessary, actuators also regulate the flow of chemical additives here as well. The control modules are connected with the optimiser, which defines optimum target values based on the optimization of running costs. The cost model takes account of relevant parameters such as energy, raw material and chemicals. This dynamic interaction between the individual components reduces quality fluctuations, which occur thanks to the heterogeneity of the raw material or production adjustments. This at the same time improves production costs. On the PM2 at Spremberg, Voith is also testing a new prototype of a virtual sensor which uses the measurements in the stock storage


tower and the process parameters to predict contamination areas. The optimiser uses the model calculated in this process to optimally adjust the variables. The self-learning system allows for automated controls, which means that the full potential of the system can be reached sooner. At present, only the OnEfficiency. DIP from Voith offers this kind of comprehensive performance. According to Hamburger Rieger this was a decisive factor in awarding the order for the stock preparation unit. With a tailored service package, Voith ensures that the OnEfficiency system will continue to perform optimally in the long term. Hamburger Rieger is part of


the Hamburger Containerboard Division of the Austrian Prinzhorn Group, whose annual production of more than two million metric tons makes it one of the market leaders in the segment for white uncoated and coated testliner.


● An automation system update and expansion for Gasum’s project at the Metsä Tissue Mänttä mill in Finland is being supplied by by Valmet. As part of the project, the mill will replace liquefied petroleum gas (LPG) with Gasum’s low-emission liquefied natural gas (LNG) in the burners of the drying processes on its tissue machines. “Valmet’s flexible approach and familiarisation with Metsä Tissue enabled us to offer a turnkey delivery to the customer,” says Tommy Mattila, sales and marketing director at Gasum.


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