EP0886722B1 - Vermeidung von verkrustung einer dampfturbinenschaufel durch reindampfeinspritzung - Google Patents
Vermeidung von verkrustung einer dampfturbinenschaufel durch reindampfeinspritzung Download PDFInfo
- Publication number
- EP0886722B1 EP0886722B1 EP97915337A EP97915337A EP0886722B1 EP 0886722 B1 EP0886722 B1 EP 0886722B1 EP 97915337 A EP97915337 A EP 97915337A EP 97915337 A EP97915337 A EP 97915337A EP 0886722 B1 EP0886722 B1 EP 0886722B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- turbine
- blade
- fluid
- steam turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/007—Preventing corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/202—Heat transfer, e.g. cooling by film cooling
Definitions
- the invention relates to a steam turbine, in particular one Low pressure steam turbine, with a turbine blade, which is directed along a major axis and a curved inflow surface for steam, as well as a use of the Steam turbine.
- DE-A-4 105 128 describes a method known for lignite processing.
- the object of the invention is to provide a steam turbine, which is suitable for operation with aggressive steam. Another task is to use a to specify such a steam turbine.
- the task aimed at a steam turbine is performed by a Steam turbine, in particular a low-pressure steam turbine, solved, which has a turbine blade which runs along a Main axis is directed to a blade root for anchoring in a housing (guide vane) or a turbine shaft (Blade), a curved inflow surface for steam and in has a fluid supply inside, which fluid supply fluidically with a plurality of fluid outlets is connected, each fluid discharge on the inflow surface opens, and which in the blade root to the outside is open, in a receiving the blade root Recess a flow channel for the supply of pure steam in the fluid supply is provided.
- a Steam turbine in particular a low-pressure steam turbine, solved, which has a turbine blade which runs along a Main axis is directed to a blade root for anchoring in a housing (guide vane) or a turbine shaft (Blade), a curved inflow surface for steam and in has a fluid supply inside, which fluid supply fluidically with a plurality of fluid outlets is connected, each fluid discharge on
- a turbine blade which has a fluid supply a fluidic connection to the inflow surface has, is when operating a steam turbine with aggressive Vapor reaches that flowing through the fluid supply and the fluid emerging at the outflow surface is the aggressive one Steam largely from the surface of the turbine blade is kept away. Depending on the throughput required of fluid through the fluid supply is dimensioned accordingly executed. You can do this as a hole or several holes, as well as an inner Show the hollow area of the turbine blade.
- the aggressive one Steam for example from the drying of wet brown coal originates, can contain strong impurities a normal turbine blade for erosion, corrosion or can lead to deposits.
- the Turbine blade for further protection against erosion and Corrosion with a special material, for example with low tension, or a special coating be provided on the surface.
- the turbine blade preferably has a blade root Anchoring in a housing (guide vane) or in a Turbine shaft (blade) of a steam turbine, the Fluid supply in the blade root is open to the outside.
- the blade root is thus structurally simple a supply of fluid, in particular pure steam or air, via the housing or the turbine shaft into the fluid supply into it.
- the supply of the fluid also leads at most low flow resistance and loss of efficiency in the steam turbine.
- the fluid supply is essentially parallel to the main axis educated.
- the fluid supply can have an axial bore or have several axial bores.
- the fluid discharges are preferably essentially each directed perpendicular to the main axis. You are through this particularly simple, for example as holes or through Castable producible. Training the fluid supply as well the fluid discharges as holes also allow this retrofitted into the turbine blade. hereby can also change the distribution of fluid discharges the inflow surface and in other surface areas of the Turbine blade according to the steam conditions in one Steam turbine to be changed. By supplying pure steam over the fluid discharge is over the inflow surface as well as further downstream surface areas of the Turbine blade creates a vapor film. This vapor film diminished or completely prevents contact of the aggressive steam contaminated with contaminants with the surface the turbine blade. The steam film also prevents a deposit of entrained in the aggressive steam Contamination on the surface and thus at least causes a significant reduction in erosion and corrosion on the inflow surface of the turbine blade.
- the flow channel is preferably in the recess as executed a groove that several turbine blades, i. their Bucket feet, fluidly connected.
- the groove is preferably an annular groove in the housing the steam turbine or in the turbine shaft.
- the steam turbine is particularly suitable for use in a plant for drying fuel, especially wet Lignite, for a power plant.
- Wet lignite for example, can improve efficiency a lignite-fired power plant become.
- the lignite can be of low quality Steam, for example from a tap in a low-pressure turbine section, be dried. The one that evaporates from the brown coal Moisture is trapped in the steam and up led to a saturated steam condition. This saturated steam can be in relaxed in a low pressure turbine to below 0.1 bar become. In this way at least part of the thermal energy, which is used to dry the wet brown coal again recovered.
- the one produced from the wet brown coal Steam may contain severe contaminants, especially Sodium, potassium, calcium, magnesium, iron, chloride, Nitrates and sulfates. When operating a low pressure steam turbine this could lead to increased corrosion and / or erosion of the turbine blades, which results in Steam turbine according to the invention by the design the turbine blades are largely avoided.
- FIG 1 is a section of a longitudinal section through a Steam turbine 14, in particular a low-pressure steam turbine, shown.
- a housing 8 of the steam turbine 14 is one Turbine shaft 9 shown.
- the turbine shaft 9 has an annular shape Recesses 12 for receiving blades 1a on.
- the housing 8 has annular recesses 12 to accommodate guide vanes 1b.
- the clarity for the sake of it is only one blade 1a and one guide blade 1b.
- Each turbine blade 1, i.e. each Blade 1a and each vane 1b has a corresponding one Blade root 7.
- the respective recesses 12 are in their shape adapted to the blade root 7. Every turbine blade 1 is directed along a main axis 2.
- the fluid outlets 6 extend itself from the fluid supply 5 to one of the Steam turbine 14 facing steam flow 21 semicircular inflow surface 3 (see FIG 2).
- the fluid drains 6 are over part of the surface of the turbine blade 1 forming inflow surface 3 so that the Inflow surface 3 is covered with a vapor film 11.
- the Steam film 11 is created by a steam flow 10, which over a flow channel 13 extending in the recess 12 is supplied becomes.
- the inflow surface 3 and possibly further downstream surface areas of the turbine blade 1 are thus protected against the steam flow 21.
- entrained contaminants for example from the drying of wet brown coal, are thus stored neither on the inflow surface 3, nor do they lead to an increased Corrosion or erosion of the turbine blade 1.
- the Flow channel 13 is a circumferential in the recess 12 Groove 13a, through which all turbine blades 1 of a guide blade row or a row of blades aerodynamically are interconnected.
- the groove 13a can for example via an axial bore (not shown) in the turbine shaft 9 or the housing 8 are supplied with pure steam 16, in such a bore several axially spaced apart Grooves 13a can be connected.
- FIG. 2 shows sections on an enlarged scale a cross section through a row of blades with two blades 1a.
- Each blade 1a has a semi-circular shape curved inflow surface directed in the direction of the main axis 2 3.
- Approximately in the center of the semicircularly curved inflow surface 3 is the one with a circular cross-section trained fluid supply 5 arranged.
- In the illustrated Cross section leads directly from the fluid supply 5 opposite to the main direction of the steam flow 21 a Fluid discharge 6 to the inflow surface 3.
- the main axis 2 above and below that shown Cross-section extending further cross-section are two each at an angle of approximately 45 ° to the fluid discharge 6 rotated further fluid discharges 6 shown.
- FIG. 3 schematically shows an arrangement of a power plant 19 with a high-pressure turbine 22, one as a steam source 20 serving low pressure turbine and an associated generator 15.
- the low pressure turbine is a steam source 20 for pure steam 16 and has a tap for discharging Low pressure steam on.
- This pure steam 16 becomes a system 17 supplied for drying a fuel 18 or waste. The drying creates an aggressive vapor, which impurities such as sodium, potassium, calcium, magnesium, Contains iron, chloride, nitrates or sulfates.
- This Steam is a low pressure steam turbine 14, which also is connected to a generator 15.
- This Low-pressure steam turbine 14 has analogous to FIG. 1 and FIG. 2 Turbine blades 1 on which one inside horizontal fluid supply of pure steam 16 is supplied to the steam source 20 becomes.
- This pure steam 16 occurs on an inflow surface 3 of the turbine blades 1, whereby this compared to the aggressive steam are protected.
- the invention is characterized by a steam turbine with a Turbine blade that has a fluid supply inside, especially for pure steam, which has a A plurality of fluid outlets connected to an inflow surface is.
- a steam turbine with a Turbine blade that has a fluid supply inside, especially for pure steam, which has a A plurality of fluid outlets connected to an inflow surface is.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Drying Of Solid Materials (AREA)
Description
- FIG 1
- in einem Ausschnitt eine Dampfturbine mit Turbinenschaufeln in einem Längsschnitt,
- FIG 2
- einen Querschnitt durch eine Turbinenschaufelreihe gemäß FIG 1 und
- FIG 3
- eine schematische Anordnung einer Dampfturbine in einer Trocknungsanlage für Brennstoff oder Abfall.
Claims (6)
- Dampfturbine (14) für eine Beaufschlagung mit verunreinigtem Dampf, insbesondere Niederdruck-Dampfturbine, mit einer Turbinenschaufel (1), die entlang einer Hauptachse (2) gerichtet ist, einen Schaufelfuß (7) zur Verankerung in einem Gehäuse (8) oder einer Turbinenwelle (9), eine gekrümmte Anströmfläche (3) für Dampf, und dadurch gekennzeichnet, daß sie in ihrem Inneren (4) eine Fluidzuführung (5) aufweist, welche Fluidzuführung (5)a) mit einer Mehrzahl von Fluidabführungen (6) strömungstechnisch verbunden ist, wobei jede Fluidabführung (6) an der Anströmfläche (3) mündet, undb) in dem Schaufelfuß (7) nach außen geöffnet ist,
- Dampfturbine (14) nach Anspruch 1, bei der die Fluidabführungen (6) der Turbinenschaufel (1) so über die Anströmfläche (3) verteilt sind, daß ein über die Fluidzuführung (5) eingespeister Dampfstrom (10) einen die Anströmfläche (5) schützend bedeckenden Dampffilm (11) bedingt.
- Dampfturbine (14) nach Anspruch 1 oder 2, bei der die Fluidzuführung (5) der Turbinenschaufel (1) im wesentlichen parallel zur Hauptachse (2) verläuft.
- Dampfturbine (14) nach einem der vorhergehenden Ansprüche, bei der jede Fluidabführung (6) der Turbinenschaufel (1) im wesentlichen senkrecht zur Hauptachse (2) gerichtet ist.
- Dampfturbine (14) nach einem der vorhergehenden Ansprüche, bei der der Strömungskanal (13) eine in der Ausnehmung (12) verlaufende mit mehreren Turbinenschaufeln (1) strömungstechnisch verbundene Nut (13a) ist.
- Verwendung einer Dampfturbine (14) nach Anspruch 4 oder 5, in einer Anlage (17) zur Trocknung von Brennstoff (18), insbesondere Braunkohle, für eine Kraftwerksanlage (19), wobei der zum Zwecke der Trocknung über den Brennstoff (18) geführte Dampf (10) der Dampfturbine (14) zugeleitet wird und zum Schutz der Turbinenschaufeln (1) aus einer Dampfquelle (20), beispielsweise einer Dampfturbine der Kraftwerksanlage (19), Reindampf (16) dem Strömungskanal (13) zugeführt wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19610134 | 1996-03-14 | ||
DE19610134 | 1996-03-14 | ||
PCT/DE1997/000430 WO1997034075A1 (de) | 1996-03-14 | 1997-03-06 | Vermeidung von verkrustung einer dampfturbinenschaufel durch reindampfeinspritzung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0886722A1 EP0886722A1 (de) | 1998-12-30 |
EP0886722B1 true EP0886722B1 (de) | 2003-08-20 |
Family
ID=7788334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97915337A Expired - Lifetime EP0886722B1 (de) | 1996-03-14 | 1997-03-06 | Vermeidung von verkrustung einer dampfturbinenschaufel durch reindampfeinspritzung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0886722B1 (de) |
JP (1) | JP3863185B2 (de) |
CN (1) | CN1084823C (de) |
DE (1) | DE59710616D1 (de) |
WO (1) | WO1997034075A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI120211B (fi) | 2005-06-14 | 2009-07-31 | Waertsilae Finland Oy | Turbokompressorin turpiiniyksikkö ja menetelmä turbokompressorin turpiiniyksikön karstoittumisen estämiseksi |
DE102009037410B4 (de) * | 2009-08-13 | 2012-02-02 | Siemens Aktiengesellschaft | Erosionsschutz für Dampfturbinenstufen |
DE102009037411B4 (de) * | 2009-08-13 | 2014-08-21 | Siemens Aktiengesellschaft | Erosionsschutzvorrichtung für Dampfturbinenstufen |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4046094A (en) * | 1976-05-03 | 1977-09-06 | Preiser Herman S | Antifouling system for active ships at rest |
JPS5999002A (ja) * | 1982-11-30 | 1984-06-07 | Toshiba Corp | 蒸気タ−ビンプラント |
DE4105128A1 (de) * | 1991-02-15 | 1992-08-20 | Ver Energiewerke Ag | Verfahren zur braunkohlenaufbereitung fuer gas-dampf-kombiprozesse |
HUT66008A (en) * | 1992-10-19 | 1994-08-29 | Elin Energieversorgung | Method and configuration of blade for preventing deposit from arising in gas-turbine |
US5374162A (en) * | 1993-11-30 | 1994-12-20 | United Technologies Corporation | Airfoil having coolable leading edge region |
-
1997
- 1997-03-06 DE DE59710616T patent/DE59710616D1/de not_active Expired - Fee Related
- 1997-03-06 WO PCT/DE1997/000430 patent/WO1997034075A1/de active IP Right Grant
- 1997-03-06 CN CN97194591A patent/CN1084823C/zh not_active Expired - Fee Related
- 1997-03-06 EP EP97915337A patent/EP0886722B1/de not_active Expired - Lifetime
- 1997-03-06 JP JP53218197A patent/JP3863185B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
WO1997034075A1 (de) | 1997-09-18 |
CN1218533A (zh) | 1999-06-02 |
DE59710616D1 (de) | 2003-10-02 |
CN1084823C (zh) | 2002-05-15 |
JP2000506246A (ja) | 2000-05-23 |
EP0886722A1 (de) | 1998-12-30 |
JP3863185B2 (ja) | 2006-12-27 |
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