Siemens HL-class pushing performance and efficiency for the next

摘要

Siemens presents the new HL-class which is an evolutionary development step from proven H-class design. With the HL-class development Siemens is pushing the efficiency beyond 63% with a clear roadmap to efficiency levels of 65%. The HL-class is a portfolio develop- ment consisting of three engines: The 9000HL for the 50Hz & 60Hz markets and a 50 Hz 8000HL engine. The engines are designed for highest operational reliability and flexibility to fulfill the requirements of base load units but also to be a perfect fit to energy systems with a rapidly increasing share of fluctuating renewables e.g. by allowing gas turbine ramp rates of up to 85 MW/min. The new HL-class is based on the reliable engine architecture of the SGT-8000H series with design features proven since years in operation. Among these are Hydraulic Clearance Opti- mization, which brings high efficiency due to tip-clearance optimization and immediate re- start at hot engine conditions, single tie-bolt/Hirth serration rotor design, which is very service friendly, reliable aircooled 4-stage turbine design concept and a can-annular combustion sys- tem. For the HL-class, Siemens continued with its proven approach to develop new gas turbines utilizing key technologies, e.g. an advanced combustion system, innovative multi-layer TBC and super-efficient internal cooling features for turbine blades and vanes. In addition, ad- vanced 3D blading was developed for the compressor resulting in higher aero-efficiency. A free standing, internally cooled turbine blade 4 reduces exhaust losses. Testing and validation is an integral part of the Siemens gas turbine development. The key technologies developed for the HL-class have been thoroughly tested at Siemens owned test facilities. The HL-class is designed to plug in to Siemens’ digital offering.