Abstract
The first Siemens AG SGT5-4000F was introduced in 1996. Since then, the combustion system was improved in several evolutionary steps in order to enhance the engine performance and emission requirements. Especially emissions requirements will become more challenging in the future as the typical limits will likely drop from 25ppm NOx to 15ppm or even single digit. In addition to clean power solutions, the market simultaneously demands increased operational flexibility in terms of load gradients, fuel flexibility (special fuels, hydrogen addition) and turndown capability.
The SGT5-4000F fleet consists of more than 350 units in operation with ∼20Mio accumulated operating hours. Retrofit ability to the fleet is therefore an important aspect of the combustion system development.
The paper reports upon the development of the latest improvements of the combustion system of SGT5-4000F engines, which have been achieved by application of the latest numerical design tools, advanced statistical machine learning techniques and utilization of additive manufacturing. Results from testing and validation of the modifications at the Siemens Clean Energy Center (CEC) for stand-alone combustion tests and Berlin Test Facility (BTF) for full scale engine tests will be presented.
The system improvement includes aero-dynamic, fuel / air mixing and combustor cooling air management optimizations, which are the typical focus areas for lean premixed combustion systems in gas turbines.
