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News

Nitrogen generators eliminate corrosion at power plant

Atlas Copco : 14 October, 2013  (Application Story)
Situated in Gondomar, in the north area of Portugal, Tapada do Outeiro combine cycle power station produces 15-20% 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.
Nitrogen generators eliminate corrosion at power plant
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 vapour. The vapour 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 vapour, creating power.
 
Nitrogen generators at power plantCarlos Carqueja, engineering manager of the company (right), 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.” He also adds: “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. 
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