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Energy saving in the drying section: Siemens software reduces steam consumption in papermaking


Erlangen, Germany, The Siemens Industry Solutions Division has developed a new software solution with an energy-saving control strategy for dryer sections. The Sipaper APC (Advanced Process Control) DrySec is designed to reduce steam consumption in papermaking by decreasing energy needs in the drying process. Optimized set points are calculated for all parameters relevant to drying and adjusted to the actual process conditions. The system has already been piloted successfully at Rhein Papier GmbH’s paper mill in Hürth near Cologne, Germany, reducing the main steam requirement by more than three percent.

Optimized process control is important for the entire papermaking process. The goal is to achieve the required product quality while at the same time minimizing the costs of raw materials, additives and energy. Utilizing steam to dry the paper, accounts for a large portion of the energy costs in the paper industry. Siemens has developed the Sipaper APC DrySec software solution to reduce the steam consumption. It is based on a physical process model that takes into account all the parameters relevant to drying. The main focus is on the air requirements, heat recovery, steam and condensate system, together with their mutual interactions and dependencies. Measured values are used to adapt the model at regular intervals to the current process conditions. Sipaper APC DrySec uses this data to calculate the best possible set points and these values are then transferred to the process control system. The air flow in the hood can then be set to minimize the quantity of air supplied. The system also ensures that water evaporating from the paper web is exhausted continuously without condensation. Depending on the type of paper machine, other parameters can be calculated, such as the heat curve, the heating of the white water and the quantity of steam in the steam box.

Sipaper APC DrySec can, in addition, be used as a soft sensor because it also calculates process variables for which no instrumentation is installed. This includes, for example, the moisture content and temperature of the paper web upstream and downstream of each drying cylinder, and the energy consumed in the heat exchanger. This leads to a better understanding of the plant. The process model can also be used for diagnostic purposes. For example, it can detect and display the gradual contamination of a heat exchanger, due to scaling and fouling.

Sipaper APC DrySec is one of the modules of the Sipaper solution platform specially developed for the pulp and paper industry. It can be linked to both Siemens and third-party process control systems. The Siemens solution for an energy-saving operation mode for dryer sections has already been implemented in the papermaking process at Rhein Papier paper mill. Siemens supplied the electrical equipment in July 2001, when the mill was built. Rhein Papier GmbH produces newsprint and is an alliance partner of the Myllykoski Group.

Further information about solutions for the pulp and paper industry is available at

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The Siemens Industry Sector (Erlangen, Germany) is the worldwide leading supplier of environmentally friendly production, transportation, building and lighting technologies. With integrated automation technologies and comprehensive industry-specific solutions, Siemens increases the productivity, efficiency and flexibility of its customers in the fields of industry and infrastructure. The Sector consists of six divisions: Building Technologies, Drive Technologies, Industry Automation, Industry Solutions, Mobility und Osram. With around 207,000 employees worldwide (September 30), Siemens Industry achieved in fiscal year 2009 total sales of approximately €35 billion.

The Siemens Industry Solutions Division (Erlangen, Germany) is one of the world’s leading solution and service providers for industrial and infrastructure facilities comprising the business activities of Siemens VAI Metals Technologies, Water Technologies and Industrial Technologies. Activities include engineering and installation, operation and service for the entire life cycle. A wide-ranging portfolio of environmental solutions helps industrial companies to use energy, water and equipment efficiently, reduce emissions and comply with environmental guidelines. With around 31,000 employees worldwide (September 30), Siemens Industry Solutions posted sales of €6.8 billion in fiscal year 2009.

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Reference Number: IIS201007430e


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