Gas turbine upgrade keeps Spanish cogen plant earning

GE has completed a major ‘flange-to-flange’ upgrade of a Frame 6B gas turbine at a cogeneration plant within an industrial recycling paper mill in El Burgo de Ebro (Zaragoza), Spain, in just seven weeks, says the company.
 
Replacing the key components of the gas turbine with new, advanced design parts has resulted in increased operating efficiency, a significant reduction in emissions and a considerable life extension for the plant.
 
The project marked the world’s first flange-to-flange replacement for a GE 6B gas turbine.
 
The paper mill is owned by corrugated cardboard box manufacturer, SA Industrias Celulosa Aragonesa (SAICA).
 
The gas turbine upgrade will enable the SAICA plant to continue to receive the total feed-in tariff from the Spanish government – according to the Spanish legislation, cogeneration plants under 50 MW no longer qualify for the total feed-in tariff after 15 years of operation, unless they adopt more efficient and environmentally responsible technologies as specified in the legislation.
 
The upgraded Frame 6B at the SAICA cogeneration plant delivers approximately 38 MW of power which is sold to the national power grid, and produces steam for use in the paper production process.
 
The project included the installation of GE’s dry low NOx combustion technology to reduce NOx emissions from around 150 ppm to less than 15 ppm, without steam injection.
 
‘This type of upgrade brings significant results in a much shorter time than replacing the old gas turbine with a new unit would require,’ said Corinne de Bilbao, general manager of GE Energy Services, Western Europe and North West Africa,.
 
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