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Industrial Steam Turbines - 20 Pages

Blading
Similar to the modularised casing elements, MAN TURBO has standardised stator and rotor blades in a variety of blade series. The profile system, which is graduated according to chord length and stagger angle, is optimally coordiͭnated with regard to aerodynamic and strength factors. The complete blade family allows a turbine to be configured so that over all possible operating speed ranges blade vibration resonance is excluded.
All guide vanes and rotor blades are manufactured from corrosion-resistant chromium steels.
High-pressure/
Intermediate-pressure
blading
The blades used in these sections have a drop-shaped reaction profile with a relatively large radius on the leading edge. This makes the profil insensitive to variations in angle of incidence over a wide operating range and ensures good profile efficiency, even in the part-load and overload range.
The milled shrouds of the rotor blades reduce losses at the blade tip, thereby increasing efficiency. The shroud gap is sealed against the guide vane carrier by labyrinth seals. T-root, double T-root or pinned root fixings are used to attach the rotor blades, depending upon the mechanical load.
Low-pressure blading
In the low pressure section, above a certain ratio of blade length to hub diameter, the rotor blades have twisted profiles.
These blades are designed as freeͭstanding, tapered blades with or without damping wires. The modular system includes T-root, double T-root and pinned root attachment options for the low-pressure blades. Surface hardening is also available, depending upon the application.
27 Blade family
25 Low-pressure blading
26 Intermediate-pressure blading
Control Stage
A single impulse stage or a Curtis wheel is used to control the turbine. The rotor blades are milled complete with integral shrouds from a single piece and in the area of the shrouds laterally caulked damping wires are inserted for optimum vibration damping. The radial gap betͭween the rotor blade shrouds and the guide vane carrier is sealed by means of labyrinth sealings strips to minimise losses.
On single impulse control stages the blades are attached to the rotor by a pinned root, whereas for Curtis wheel control stages double T-roots are used.
28 Control stage
16
Industrial Steam Turbines
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    Casing All steam turbines made by MANTURBO have a horizontally split casing ofcast steel. The guide vane carriers aresupported thermoelastically inside...
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    Bearing housing and bearings The modularised design system includes a standard range of bearing housings for the live steam and exhaust sides of the...
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    Actuators and Valves The actuators used in MAN TURBO steam turbines are distinguished by their excellent control characteristics, short response times...
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    Inlet casing Two types of inlet casing are available: Standard Casing The standard inlet casing is an economically efficient, proven design for live...
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    Rotors All steam turbine shafts are single piece forgings and the choice of material depends on the requirements of the individual application. State-of-the-art...
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    Guide vanes and guide vane carriers Guide vane carriers are suspended ther-moelastically in the turbine casing and are split horizontally. Furthermore,...
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    Applications The design of steam turbines used for such as pumps, blowers or compres-sors, must be flexible to adapt to theprocess requirements; flexible...
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    Generator drives We supply condensing and backpressure steam turbines up to power outͭputs of 120 MW to drive electrical generators. These are...
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    MAN Turbomaschinen AGGHH BORSIGSteinbrinkstrasse 146145 Oberhausen / GermanyPhone+49. 208. 6 92-01Fax +49. 208. 6 92-20 19 MAN Turbomaschinen AGGHH BORSIGEgellsstrasse...
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