Features & BenefitsClosed-Loop Steam CoolingOpen loop air-cooled gas turbines have a significant temperature drop across the first stage nozzles, which reduces firing temperature. The closed-loop steam cooling system allows the turbine to fire at a higher temperature for increased performance, yet without increased combustion temperatures or their resulting increased emissions levels. This closed-loop steam cooling enables the H System to achieve 60 percent fuel efficiency at rated conditions while adhering to the strictest low nitrogen oxide standards and reducing carbon dioxide emissions. Additionally, closed-loop cooling also minimizes parasitic extraction of compressor discharge air, thereby allowing more air to flow to the combustor for fuel premixing. Single Crystal MaterialsThe use of these advanced materials on the first stage nozzles and buckets, and thermal barrier coatings on the first and second stage nozzles and buckets, ensures these components stand up to high firing temperatures while meeting maintenance intervals. Dry Low NOx CombustorsBuilding on GE's design experience, the H System employs a can-annular lean pre-mix DLN-2.5 Dry Low NOx (DLN) Combustor System. Fourteen combustion chambers are used on the 9H, and 12 combustion chambers are used on the 7H. GE DLN combustion systems have demonstrated the ability to achieve low NOx levels in several million hours of field service around the world. The H System DLN 2.5 combustion system wil have increased fuel flexibility, while maintaining the capability to achieve low NOx between 50 and 100% load. Small Footprint/High Power DensityThe H System offers improved power density per installed megawatt compared to other combined cycle systems, once again helping to reduce the overall cost of producing electricity. Thoroughly TestedThe design, development and validation of the H System has been conducted under a regimen of extensive component, sub-system and full unit testing. Broad commercial introduction has been controlled to follow launch units demonstration. This thorough testing approach provides the introduction of cutting edge technology with high customer confidence. The first H System located at Baglan Bay, Wales has been in commercial operation since September 2003 and has achieved significant operating experience.
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H System™ Combined Cycle Gas Turbine
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