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Atlas Copco nitrogen generators help eliminate corrosion at major Portuguese power plant

Wilrijk, Belgium, October 2013. Situated in Gondomar, in the north area of Portugal, Tapada do Outeiro combine cycle power station produces 15-20 percent of the country’s electrical needs. The company relies on an NG 81 generator from Atlas Copco Rental to supply pure nitrogen to replace the air in the steam generator’s tubes when they are not in use, eliminating corrosion.

14 października 2013

Atlas Copco rental Portugal - Power plant Tapada do Outeiro, October 2013?
The power plant at Tapada do Outeiro represents a new era in the production of electrical energy in Portugal. Using combined cycle gas turbine (CCGT) technology to generate power, the CCGT power station has three groups of turbo generators, producing electric power from natural gas. The gas is burned in a gas turbine, which is similar in operation to an airplane turbine. The gas from the exhaust, which is extremely hot, goes into the steam generator like a steam boiler, heating the water and transforming it into superheated vapor. The vapor is then used to engage another turbine similar to the ones used in coal thermoplants. An alternator is then driven by both turbines, gas and vapor, creating power.

Carlos Carqueja, engineering manager of the company, explains the fundamental role Atlas Copco Rental’s NG 81 generator has in the operation of the plant:

Nitrogen is used to preserve the steam generators. When they are not in use, air goes into the tubes, so the steam generators can suffer corrosion. The replacement of air by high-quality nitrogen eliminates the corrosive effect on the steam generator ... the rental option, allow us, at a very reasonable cost, to test the technical viability of keeping a very poor oxygen atmosphere with the nitrogen generators for long periods. After two months, Tapada do Outeiro is very satisfied with the quality and reliability of the equipment, which has required no maintenance since it has been in operation. The company is also pleased with the technical team supporting the equipment ... I would not hesitate to recommend a rental solution from Atlas Copco to other plants with the same needs.
Carlos Carqueja

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Atlas Copco is a world-leading provider of sustainable productivity solutions. The Group serves customers with innovative compressors, vacuum solutions and air treatment systems, construction and mining equipment, power tools and assembly systems. Atlas Copco develops products and service focused on productivity, energy efficiency, safety and ergonomics. The company was founded in 1873, is based in Stockholm, Sweden, and has a global reach spanning more than 180 countries. In 2015, Atlas Copco had revenues of BSEK 102 (BEUR 11) and more than 43 000 employees.

Specialty Rental is a division within Atlas Copco’s Construction Technique business area. It serves customers in the industry segments around the world with temporary air, nitrogen, steam and power rental solutions. The specialty rental services are offered under several brands. The divisional headquarters is located in Houston, USA.