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The paper industry has been undergoing changes ever since the turn of the millennium. Having primarily focused on product quality improvements in the 1990s, requirements in the industry have now shifted towards cost optimization. In particular, the rise in electricity and gas prices has led to a rethink concerning the dimensions of the systems – in the past, paper machines were designed to be as large as possible and based on the maximum output. Nowadays, cost savings and thus energy saving measures are becoming increasingly important in production systems consuming large amounts of electricity. This results in an increased demand towards systems for the production of paper and board which save resources and reduce costs.
MAN's vacuum blowers are used during production at the point where the system dewaters the paper via a vacuum. Compared with water ring pumps, the TURBAIR system needs 30% less energy and, unlike normal, does not use any water. In addition, the heat exchanger ensures that the hot waste air can be fed back into the energy cycle – leading to a reduction in energy consumption of up to 60%.
The well-known paper manufacturer UPM Nordland Papier decided to convert a large paper machine in Dörpen (Germany) and replaced eight water ring pumps with two MAN vacuum blowers.
The public demand for products with a low ecological footprint is continually on the rise. For the paper industry, this means that water – and above all energy consumption – must be drastically reduced in order to give this CO2-intensive industry a sustainable future. At the same time, the global requirements for board and tissue products are increasing, which is leading to the construction of new plants.
"When new plants are built, the decision between using MAN vacuum systems and conventional water ring pumps is generally no longer necessary. In addition to the very wide operation range of the blowers, frequency-controlled drives are increasingly being used. This means that both the air volume and the vacuums can be optimally adapted to the conditions of the paper machine. Together, these benefits result in a simple ROI calculation for paper producers.
A TURBAIR system has a payback period of less than two years," explains Dobler.
In 2017, MAN Energy Solutions installed the TURBAIR technology in 40 paper and tissue machines. The 53 blowers in total are used in 25 board and 15 tissue machines. The replacements made up around half of all vacuum systems sold