Siemens Steam Turbines
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Siemens Steam Turbines
Industrial steam turbine for an output range of up to 175 MW
The SST-700 is a dual casing steam turbine with up to 175 MW power output. It is specially designed for power generation applications. In order to make the best use of large changes in volumetric flow from inlet to outlet, the SST-700 turbine series is divided into two different modules: one high-pressure turbine (HP) and one low-pressure turbine (LP), operating at different speeds. The two modules are combined to provide the turbine configuration. However, each module can also be utilized on its own, e.g. the high-pressure module can be used as a separate back pressure unit.
Typical fields of application for the SST-700 :
Optimum performance is assured by choosing dimensions for each cylinder appropriate to volumetric flow. Internally controlled process steam extraction provides a constant extraction pressure over a broad range of steam flows, a feature that makes the SST-700 steam turbines both flexible and easy to operate. Bleed extractions are available and can be equipped with external pressure control valves. With a symmetrical barrel type casing and small dimensions of the hot parts, resulting in low thermal and mechanical inertia, the SST-700 turbine can accept very short start-up times and rapid load changes.
A parallel arrangement is used below 60 MW, where HP and LP turbines are connected to two pinions on the same reducing gear, for extra compactness. With the in-line arrangement, the HP turbine and the reducing gear are on one side of the generator and the direct-drive LP turbine and the condenser on the other side.
|Power output||up to 175 MW|
|Turbine speed||3,000 to 13,200 rpm|
|Inlet steam pressure (including reheat application)||up to 165 bar|
|Inlet steam temperature (including reheat application)||up to 585°C|
|Bleed||up to 120 bar|
|Controlled extraction||Pressure: up to 40 bar; temperature: up to 415°C|
|Exhaust steam||Back pressure: up to 40 bar; condensing: up to 0.6 bar; district heating: up to 3 bar; exhaust area: 1.7 to 11 m²|
All data are approximate and project-related.
Typical dimensions of the SST-700 series
Length (L): 22 m* / Width (W): 15 m* / Height (H): 6 m*
* incl. condenser
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