Siemens Gas Turbine SGT-750
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Siemens Gas Turbine SGT-750
Power Generation: ISO 38.1 MW(e) / Mechanical Drive: 39.3 MW
The Siemens SGT-750 is a low-weight industrial gas turbine designed and developed to incorporate size and weight advantages of the aeroderivative gas turbine whilst maintaining the robustness, flexibility and longevity of the traditional heavy-duty industrial gas turbine. It has a power output of 38 MW for power generation, or of 39 MW for mechanical drive. The turbine was specifically designed for long operating times with extended overhaul intervals, and features easy maintenance, high availability, and outstanding reliability. With extremely low downtimes for planned overhaul and maintenance work (only 17 days in 17 years), the SGT-750 achieves the highest availability in its performance class. Thanks to its high efficiency and low emissions, this gas turbine is a highly economical and environmentally friendly prime mover.
The SGT-750 industrial gas turbine features a particularly favorable power-to-weight ratio. The SGT-750 uses proven design principles and combines the best and most reliable materials and components. As a result, Siemens developers created a state-of-the-art gas turbine with minimal fuel consumption and extremely high availability.
The SGT-750 gas generator consists of a 13-stage axial air compressor with a rotor built from a number of fully electron-beam-welded disks. The intermediate shaft is welded onto the compressor and the two gas generator turbine disks are bolted onto the intermediate shaft. The low-pressure section is manufactured out of low alloy steel, whereas Inconel 718 is used for the disks in the high-pressure section. The cooled gas generator turbine stator and rotor blades are precision-cast components.
Although the compressor section of the SGT-750 is of conventional horizontally split design, the remaining sections in the unit use single-piece, circular stator components arranged behind each other, thus avoiding any loss of circularity and reducing aerodynamic losses to a minimum. These sections can be removed as modules, which provides for easy access and simple maintenance.
The combustion chamber system for the 37 MW SGT-750 gas turbine consists of eight tubular combustion chambers with a double-walled serial-cooled design and eight double-walled transition ducts with parallel cooling. The system is suitable for both liquid and gaseous fuels. The tubular design provides for outstanding ease of maintenance and exchangeability.
The SGT-750’s two-stage compressor turbine comprises the stator with guide vanes and the rotor assembly bolted to the compressor rotor. The first stage is cooled by a combination of internal convective cooling and film cooling.
The SGT-750’s power turbine is a two-stage axial-flow turbine, aerodynamically connected to the gas generator. The nominal turbine speed is 6100 rpm and the direction of shaft rotation is clockwise looking in the direction of the flow. In mechanical drive applications, the turbine speed range is 50 – 105% of the nominal speed.
Flight throug the SGT-750