Steam turbine installation and associated operating method
Inactive Publication Date: 2009-02-05
ALSTOM TECH LTD
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
[0010]The invention attempts to provide a remedy for this. One of numerous aspects of the present invention deals with the problem of showing a method for a steam turbine installation of the type mentioned in the introduction, which especially reduces the risk of erosion of the blades of the steam turbine as a result of oxide particles.
[0012]The use of an inertial separator, which in particular can be designed as a cyclone separator, is a comparatively inexpensively realizable measure which is characterized by a comparatively low pressure loss compared with the use of conventional filters. Furthermore, the use of an inertial separator is considerably more cost-effective than the use of high-purity water for reducing the oxidation effect of the steam, or than the use of especially high-value materials in the region of the steam generator for increasing the oxidation-resistance of these components, or than the use of especially high-value alloys or coatings or surface treatments of the blades for improving the erosion-resistance of the blades. In comparison to these alternatives, the inertial separator is therefore characterized by an extremely low pressure loss and also by an inexpensive realizability. An inertial separator is characterized in that a flow deflection is forced within it, which the entrained particles cannot follow on account of their greater mass. Instead of this, the particles impinge upon corresponding obstacles, as a result of which they are additionally braked.
Problems solved by technology
It has been shown that at these high steam temperatures, the oxidation of the steam-conducting components, for example of the steam generator, increases superproportionally.
The particles thus get into the steam turbine, but, as a result of inertia, cannot follow the deflections of the steam flow along the blades, as a result of which they impinge upon stator blades and rotor blades.
With the prevailing high velocities, it leads to erosion phenomena on the blades.
Such erosion phenomena have a negative effect on the aerodynamics of the blades which leads to a reduction of the efficiency of the steam turbine.
Method used
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[0018]According to FIG. 1, a steam turbine installation 1 exemplifying principles of the invention includes a steam path 2, in which a steam turbine 3 and a steam generator 4 are arranged. In this case, the steam turbine 3 is located downstream of the steam generator 4 and for example can drive a generator 5 so that the steam turbine installation 1 preferably serves for electricity generation. The steam turbine installation 1 can be a part of a combined cycle plant, that is to say a combined gas turbine-steam power plant. In particular, the steam generator 4 can then be heated with hot exhaust gases of the gas turbine. In principle, however, the heating of the steam generator 4 is designed in any desired manner.
[0019]According to an exemplary embodiment of the invention, an inertial separator 6 is arranged in the steam path 2 downstream of the steam generator 4 and upstream of the steam turbine 3. The inertial separator 6 serves for separating out particles, that is to say as a rule...
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Abstract
A steam turbine installation (1), especially for electricity generation, includes a steam path (2) in which a steam generator (4) and a steam turbine (3) are arranged. In order to reduce the risk of erosion for components which are arranged in the steam path (2), for example blades of the steam turbine (3), an inertial separator (6) is arranged in the steam path (2) between the steam generator (4) and the steam turbine (3).
Description
[0001]This application is a Continuation of, and claims priority under 35 U.S.C. § 120 to, International application no. PCT / EP2007 / 050730, filed 25 Jan. 2007, and claims priority therethrough under 35 U.S.C. §§ 119, 365 to Swiss application no. 00531 / 06, filed 31 Mar. 2006, the entireties of which are incorporated by reference herein.BACKGROUND[0002]1. Field of Endeavor[0003]The invention relates to a steam turbine installation, especially for electricity generation.[0004]The invention also relates to a method for operating such a steam turbine installation. Furthermore, the invention relates to a use of an inertial separator.[0005]2. Brief Description of the Related Art[0006]A combined gas turbine-steam power plant for electricity generation is known from CH 653 097 A5. Such a combined cycle plant includes, on the one hand, a gas turbine with an associated compressor and an associated combustion chamber, and also, on the other hand, a steam turbine with an associated steam generat...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01K21/06F01K13/00
CPCB04C5/04B04C5/081F05D2220/31F01D25/32F01K21/06B04C5/12
InventorGREIM, RALFRICE, TIMOTHY STEPHEN
OwnerALSTOM TECH LTD