TPT January 2013

Technology News

Productivity leap for power plant construction

POWER plant construction in Asia is booming. New power plants in India or China need to meet the growing energy demands of the aspiring economic nations. Power plant constructors are consequently also making provisions: new production sites are emerging that guarantee efficient production of the components. One example of the required plant technology is the world’s largest membrane tube wall bending machine, which has been developed by Schwarze-Robitec specifically for an Indian customer. It makes a vital improvement to the efficiency of the entire power plant construction. Modern power plant construction is inconceivable without the use of membrane tube walls: before installation, individual tubes are welded to form larger tube walls, membrane tube walls or even finned tube walls. After welding the membrane tube walls, they need to be bent according to the boiler design. Inside the power plant block, fitters connect the tube walls to the actual combustion chamber of the power plant. As a huge conduit system, the tube walls are perfectly adapted to the shape of the block and ensure effective heat exchange. However, the membrane tube walls must be bent in advance, with millimetre precision, as Schwarze- Robitec managing director Bert Zorn highlighted: “Even a minimal deviation in a bend will result in a tube wall no longer fitting the subsequent segment.” In light of this, the design service from the Cologne-based bending specialist is exceptional. The world’s largest membrane tube wall bending machine was developed for the Indian customer. The plant is equipped with the latest CNC control. It is able to bendmembrane tube walls with widths of up to 3.6m – the previous maximum passage width in plant construction was three metres. Over 25m of tube walls are accurately fed into the machine and bending takes place with a bending angle of up to 135° using a modified compression bending procedure. Unlike in a bending press, this allows the production of high quality bends.

World’s largest membrane tube wall bending machine: FL 3600

as larger membrane tube walls can be pre-finished in future. This reduces installation effort and costs. The system currently supplied is part of a large order for a total of eight bending machines. In the case of the Indian customer, a complete production plant for tube boilers is being created. Mr Zorn added: “We are convinced that the combination of bending technology, CNC control and new passage width is of great interest to many power plant constructors.” Schwarze-Robitec GmbH – Germany Email: sales@schwarze-robitec.com Website: www.schwarze-robitec.com

One outstanding feature is the mobility of the huge plant. It can be swivelled by 25 degrees in both directions. This allows diagonal bending of the membrane tube walls without the need to move the long “wall” sideways in the production hall. At the same time, a perfectly balanced bending mechanism guarantees high- precision results. “All components such as CNC control, hydraulics, bending tools, tensioning device and laser alignment are perfectly aligned to each other,” explained bending specialist Bert Zorn. The system secures a huge leap in productivity for power plant construction,

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J anuary 2013