EP3653850B1 - Abgasdiffusor für eine dampfturbine und zugehörige dampfturbine - Google Patents
Abgasdiffusor für eine dampfturbine und zugehörige dampfturbine Download PDFInfo
- Publication number
- EP3653850B1 EP3653850B1 EP18206751.2A EP18206751A EP3653850B1 EP 3653850 B1 EP3653850 B1 EP 3653850B1 EP 18206751 A EP18206751 A EP 18206751A EP 3653850 B1 EP3653850 B1 EP 3653850B1
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- EP
- European Patent Office
- Prior art keywords
- last stage
- exhaust
- exhaust diffuser
- outer guide
- inflection point
- Prior art date
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- 230000004323 axial length Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- 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
- F01D25/30—Exhaust heads, chambers, or the like
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- 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
- F05D2210/00—Working fluids
- F05D2210/40—Flow geometry or direction
- F05D2210/42—Axial inlet and radial outlet
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- 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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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- 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
- F05D2250/00—Geometry
- F05D2250/30—Arrangement of components
- F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
- F05D2250/314—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being inclined in relation to each other
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- 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
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- the present invention relates to an exhaust diffuser assembly for a low pressure steam turbine and to a steam turbine comprising said exhaust diffuser.
- An exhaust system assembly is the last part of a steam turbine assembly, discharging the exhaust steam from the steam turbine via an exhaust diffuser and through a discharge opening, typically to a condenser to be condensed and brought back into the system.
- a conventional exhaust system comprises an annular diffuser, which is positioned directly behind the last row of blades of the steam turbine.
- the diffuser forms part of the exhaust system of the steam turbine system and comprises an exhaust guiding channel, formed by an inner guide and an outer guide, the outer guide being the guide that is distant from a side wall of the exhaust casing and the inner guide being the guide that is usually connected to the side wall of the exhaust casing.
- the configuration of the individual elements within the exhaust system influences primarily overall efficiency of the steam flow and secondarily also complexity of the construction and reduction of expenses, which follows from both the efficiency improvement and reduction of complexity of construction. It is desirable to achieve a smooth and acceptably uniform flow of the exhaust steam, i.e. uniform circumferential and radial pressure distribution of the steam after passing through the last stage blades, i.e. in the inlet area of the exhaust, and in the exhaust itself, while maintaining the exhaust diffuser as axially short as possible with the effect of improved efficiency with reduced expenses.
- US 2013/0243564 proposes a diffuser with the outer guide surface having a defined curvature - a first angle with respect to the axis of the turbine and a defined ratio of a guide surface axial length (SGL) to the active length of the last stage bucket (AL), which is between about 0,45 to 0,70, preferably 0,55; the axial length being measured from the centerline of the last stage bucket to the end of the steam guide surface, and the active length of the last stage bucket.
- SGL guide surface axial length
- AL active length
- the curvature of the outer guide may be given by several angles, starting with the tip angle (angle A, defined at the blade tip), which is specified to be 0° or 25°, and continuing with three further angles (B, C, D), corresponding to the range of change in the angle over the previous 25%, 50%, and 75% meridional length of the steam guide from the last stage bucket, i.e. to ranges of 0°-18°, 14°-32°, and 16°-32°.
- EP 0418887 discloses an exhaust diffuser for steam turbines with the outer guide, which comprises two parts and a small annular gap, through which a steam is tangentially blown into the inner space of the diffuser.
- the inner guide appears to have at least three inflection points.
- EP 3299592 discloses an exhaust diffuser wherein a guiding rib is attached to an inner surface of the upper wall of the exhaust casing in order to guide the steam towards the outlet.
- US 6261055 discloses an exhaust diffuser for steam turbines with a slowly increasing cross-sectional area to avoid flow separation in the diffuser.
- US 2011/250064 discloses an exhaust diffuser with a radially inward depression in the outer guide to suppress the negative effects of vortices formed by the last stage blade's tip shroud.
- the invention concerns an exhaust diffuser according to claim 1 and a steam turbine according to claim 13.
- the exhaust diffuser assembly for a steam turbine primarily for a low pressure steam turbine, comprises a substantially annular diffuser with an inner guide and an outer guide, forming a guiding channel.
- the inner guide is positioned closer to the annulus center and part of the inner guide may form the side wall of the exhaust casing, while the outer guide is positioned further from the annulus center and is also distant from a side wall of the exhaust casing.
- the inlet starts directly behind the last stage blades and the inlet area is given by the area of the last stage blades defined between the base of the last stage blade and the stator body above the tip of the blade.
- the outlet area is given as the area between the endpoint of the outer guide and the side wall of the exhaust casing.
- the inner guide comprises an inclined wall, which preferably comprises three or four inflection points that serve to adjust the shape of the wall to guide the steam as smoothly as possible.
- the first inflection point is identical with the beginning of the inclined wall of the inner guide and is positioned just after the base of the last stage blades in the plane of the blade base, i.e. in a radial distance from the longitudinal axis of the turbine, which corresponds to the radius of the rotor disc.
- the last inflection point is the inflection point in the intersection of a side wall and the top of the exhaust casing.
- the exhaust casing may form part of the exhaust diffuser.
- the remaining inflection points - the second inflection point and optionally the third inflection point are positioned between the first inflection and the last inflection point.
- the second inflection point may be positioned in the intersection of the inclined wall of the inner guide and the side wall of the exhaust casing.
- the third inflection point may further be positioned at a distance of the side wall of the exhaust casing, between the first inflection point and the second inflection point, i.e. side wall of the exhaust casing.
- the inclined wall of the inner guide is not connected to the base of the last stage blades.
- the inclined wall of the inner guide may be connected to the rotor casing sealing rather than to the base of the last stage blades.
- the connection between the inclined wall and the rotor casing sealing may be provided by any common means and at any point of the inclined wall.
- such a connection is provided in the first half of the inclined wall, i.e., in the half that is closer to the base of the last stage blades.
- the inflection points determine sections of the inclined wall with different inclination.
- the inclination of the inclined wall of the inner guide is determined at the first inflection point and may be equal to 10° - 20°, preferably about 15°, or 40°- 45°, preferably about 42°, with respect to the longitudinal axis of the rotor disc, i.e. the longitudinal axis of the steam turbine assembly.
- the angle lies between 10° and 20°, when there are four inflection points in total, and between 40°and 45° when there are three inflection points in total.
- the third inflection point is positioned between the first and the second inflection point and splits the inclined wall of the inner guide in two parts.
- the first part of the inclined wall is inclined by 10° to 20° with respect to the longitudinal axis of the steam turbine assembly and the second part of the inclined wall is preferably inclined by 50° to 60°, preferably by 55°, with respect to the longitudinal axis of the steam turbine assembly.
- the second and the last inflection points form part of the side wall of the exhaust casing, both are positioned at the distance from the centerline of the last stage blades that determines the axial length of the exhaust diffuser, which is given so that the ratio of the axial length of the exhaust diffuser to the distance between the base of the last stage blade and the stator body above the tip of the blade is in the range of 1,25 to 1,5.
- the first inflection point is positioned in the plane of the blade base, i.e.
- the second inflection point is preferably positioned at a radial distance from the longitudinal axis of the turbine, which is larger than the radius of the rotor disc but lower than the length of the last stage blade.
- the third inflection point may be positioned on the inclined wall between the first and the second inflection point, preferably in the second third of the axial length of the diffuser.
- the outer guide of the diffusor comprises a curved wall, which may comprise one or two parts, both attached to the stator body of the turbine above the tip of the last stage blade.
- the curved wall of the outer guide has a starting point positioned above the last stage blades, and an endpoint, which is located at a distance from the centerline of the last stage blade, at a distance from the side wall of the exhaust diffuser and at a radial distance from the longitudinal axis of the turbine assembly, the two latter dimensions defining the outlet area of the exhaust diffuser.
- the outer guide may comprise one part, or two parts, separated by a slit, through which a steam may be blown in into the exhaust guiding channel in a controlled manner to accelerate the steam passing close to the outer guide.
- the slit may be provided between the two parts of the outer guide in such a way, that the end region of the first part of the outer guide and the starting region of the second part of the outer guide overlap, creating an overlapping region and, in this overlapping region, or at least in a part of it, the end region of the first part of the outer guide and the starting region of the second part of the outer guide are parallel or substantially parallel, such that the width of the slit is equal or substantially equal along this part.
- they may be positioned at a very small angle, the angle being preferably less than 5°, more preferably less than 4°, even more preferably less than 3°, even more preferably less than 2°, even more preferably less than 1°.
- the two parts may be strictly parallel in the at least part of the overlapping region.
- the dimensions of the slit depend on various parameters and are, thus, to be computed accordingly.
- the length of the slit, or the length of the overlapping region, respectively is longer than the width of the slit, more preferably, the part of the overlapping region, where the end region of the first part of the outer guide and the starting region of the second part of the outer guide are parallel or substantially parallel, is longer than the width of the slit, but preferably not longer than the double width of the slit.
- the shape of the outer guide may be given by the endpoint of the outer guide and by the parallelism between the end region of the first part of the outer guide and the starting region of the second part of the outer guide, if the outer guide has two parts.
- the curved wall of the outer guide starts above the tip of the last stage blade at the connection of the outer guide to the stator body of the steam turbine assembly.
- the endpoint of the outer guide at a distance from the centerline of the last stage blade and at a distance from the side wall of the exhaust casing.
- the ratio of the distance of the endpoint from the centerline of the last stage blade and the distance between the base of the last stage blade and the stator body above the tip of the blade is preferably between 0,45 and 0,6.
- the position of the endpoint also defines the outlet area of the steam passing through the diffuser.
- the ratio of the outlet area to the inlet area, which is determined by the area of the last stage blades is between 1,45 and 1,85.
- the diffuser according to the present invention may form part of the exhaust casing and may further be combined with a guiding rib.
- the guiding rib may be attached to the upper wall of the exhaust casing, extending radially inwards, and oriented perpendicularly to the longitudinal axis of the system.
- the guiding rib serves as a guide for the steam exiting the outlet of the diffuser in the substantially vertically upward direction to be turned in 180 degrees in order to flow downwards to the outlet of the exhaust system.
- the guiding rib may extend from the horizontal plane of the longitudinal axis of the system and follow the cylindrical shape of the upper wall of the exhaust casing, and it may have an I-shape or a T-shape in cross-section.
- the guiding rib may have dimensions and may be positioned as defined in European patent application EP 16189912.5 , i.e.
- the parameter m is defined as a distance of an end point of an outer guide of a diffuser of the steam turbine system from the inner surface of the side wall, and may have height that lies within the range of 0.05* H to 0.15* H , wherein H is the height of the steam turbine system between the horizontal plane of the longitudinal axis and the highest point of the upper wall.
- the application of the guiding rib leads to further efficiency improvement as it serves as a guide for the steam exiting the outlet of the diffuser, thus reducing vortices in the steam flow.
- Example 1 Relevant parameters of the exhaust diffuser geometry Parameter Example 1
- Example 2 Example 3 D p 1880 mm 1880 mm 2050 mm L LSB 1220 mm 1220 mm 1370 mm L 1 1250 mm 1250 mm 1390 mm L AL 1820 - 1860 mm 1600 - 1640 mm 1890 - 1940 mm ⁇ 15° 15° 42° ⁇ 55° 55° -- x E 670 - 730 mm 575 - 610 mm 645 - 690 mm L AL / L 1 1,45-1,49 1,28 - 1,31 1,36 - 1,40 x E / L 1 0,54 - 0,58 0,46 - 0,49 0,46 - 0,5 S 1 12,3 m 2 12,3 m 2 15,0 m 2 S 2 20,97 m 2 18,2 m 1 27,1 m 2 S 2 /S 1 1,7 1,48 1,8
- the outer guide 6 comprises one part.
- the inner guide 7 has four inflection points - A, B, C, D.
- the first inflection point A is positioned close to the base of the last stage blades 3 and it is identical with the beginning of the inclined wall 71 of the inner guide 7.
- the inclined wall 71 of the inner guide is connected to the rotor casing sealing (not shown). There is no fixed connection between the inclined wall of the inner guide and the base of the last stage blades.
- the last inflection point D is positioned in the intersection of a side wall 42 and the top 41 of the exhaust casing 4.
- the second inflection point C is positioned in the intersection of the inclined wall 72 of the inner guide and the side wall 42 of the exhaust casing 4, so that the distance of the second inflection point (or the distance of the last inflection point) from the centerline 31 of the last stage blades 3 determines the axial length L AL of the exhaust diffuser.
- the ratio of the axial length L AL to the distance L 1 between the base 2 of the last stage blade and the stator body above the tip of that blade may be between 1,45-1,49.
- the inclined wall of the inner guide 7 is split in two parts by the third inflection point B, positioned between the first inflection point A and the second inflection point C.
- the outer guide 6 comprises two parts 61 and 62 and a slit 63 between them, through which a steam is tangentially blown into the inner space of the diffuser.
- the first 61 and the second 62 parts are positioned in such a way that there is a slit 63 between the first part 61 of the outer guide 6 and the second part 62 of the outer guide 6 and the end region of the first part 61 of the outer guide 6 and the starting region of the second part 62 of the outer guide 6 are parallel or substantially parallel in the overlapping region d parallel , or at least in a part of it, such that the width of the slit is equal or substantially equal along this part, the end region of the first part and the starting region of the second part of the outer guide may be positioned at a very small angle ⁇ ⁇ 3 ° as can be seen in the detail insert in Fig. 2 .
- the inner guide 7 has again four inflection points - A, B, C, D.
- the ratio of the axial length L AL to the length L 1 is between 1,28 - 1,31.
- the ratio of the distance x E of the endpoint E from the centerline 31 of the last stage blade and L 1 is 0,46 - 0,49 and the ratio of the outlet area S 2 to the inlet area S 1 , is approximately 1,48.
- the outer guide 6 comprises two parts 61 and 62 and a slit 63 between them, through which a steam is tangentially blown into the inner space of the diffuser.
- the slit 63 is positioned as defined in example 2.
- the inner guide 7 comprises three inflection points - A, C, D.
- the first inflection point A is positioned behind the base of the last stage blades 3 and it is identical with the beginning of the inclined wall 70 of the inner guide 7.
- the inclined wall 70 of the inner guide is connected to the rotor casing sealing (not shown). There is no fixed connection between the inclined wall of the inner guide and the base of the last stage blades.
- the last inflection point D is positioned in the intersection of a side wall 42 and the top 41 of the exhaust casing 4.
- the second inflection point C is positioned in the intersection of the inclined inner guide 7 and the side wall 42 of the exhaust casing 4.
- the ratio of the axial length L AL to L 1 is between 1,36 and 1,40.
- the diffuser according to the present invention may form part of the exhaust casing and may further be combined with a guiding rib 8 as shown in all three examples 1, 2, and 3, as can be seen in Figs, 1 , 2 and 3 .
- the guiding rib 8 is attached to the upper wall 41 of the exhaust casing 4, extending radially inwards and oriented perpendicularly to the longitudinal axis of the system.
- the guiding rib extends from the horizontal plane of the longitudinal axis of the system and follows the cylindrical shape of the upper wall of the exhaust casing. It may have an I-shape or a T-shape in cross-section.
- the guiding rib 8 is positioned at a distance ranging between 1.2* m and 1.9* m from the inner surface of the side wall 42 of the exhaust casing, wherein the parameter m is defined as a distance of an end point of an outer guide of a diffuser of the steam turbine system from the inner surface of the side wall, i.e., L AL - x E .
- the application of the guiding rib leads to further efficiency improvement as it serves as a guide for the steam exiting the outlet 51 of the diffuser guiding channel 5, thus reducing collisions within the flow.
- the above described configurations of the exhaust system lead to the efficiency improvement of up to 6% of last stage blade efficiency in comparison with traditional shape of low pressure steam turbine diffuser.
- the efficiency improvement can be seen in Fig. 4 .
- the efficiency of last stage of the steam turbine and the diffuser according to the present invention is shown. It is given for a volumetric flow of a steam through the last stage and the diffuser. It can also be seen that the efficiency improvement is stable over a relatively wide range of the volumetric flow. Accordingly, the geometry of the present invention can be applied widely and to various operation regimes.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Claims (13)
- Abgasdiffusor für eine Dampfturbine mit einem Eintrittsfläche (S1) und einem Austrittsfläche (S2), einer Innenführung (7) und einer Außenführung (6) mit einem Endpunkt (E), wobei die Innenführung (7) eine geneigte Wand (70, 71, 72) mit drei oder vier Wendepunkten (A, B, C, D) umfasst, wobei die Wendepunkte (A, B, C, D) bestimmen Abschnitte (70, 71, 72) der geneigten Wand mit unterschiedlichem Neigungswinkel bezüglich der Längsachse der Dampfturbine, wobei die Innenführung (7) so angepasst ist, dass ein Verhältnis von axialer Länge (LAL ) des Abgasdiffusors zu Abstand (L1 ) zwischen einer Basis (2) einer Schaufel der letzten Stufe (3) und eines Statorkörpers über einer Spitze der Schaufel der letzten Stufe (3) zwischen 1,25 und 1,5 liegt, und wobei ein erster Wendepunkt (A) mit dem Anfang der geneigten Wand (70, 71) der inneren Führung (7) identisch ist;dadurch gekennzeichnet, dassdie äußere Führung (6) so angepasst ist, dass das Verhältnis von Austrittsfläche (S2) zu Eintrittsfläche (S1) zwischen 1,45 und 1,85 liegt, der erste Wendepunkt (A) kurz hinter dem Boden (2) der Schaufel (3) der letzten Stufe liegt in einer Ebene der Basis (2) der Schaufel (3) der letzten Stufe, und ein Neigungswinkel (α) am ersten Wendepunkt (A) zwischen 10° und 20° liegt, wenn insgesamt vier Wendepunkte vorhanden sind, oder zwischen 40° und 45°, wenn insgesamt drei Wendepunkte vorhanden sind.
- Abgasdiffusor nach Anspruch 1, wobei das Verhältnis eines Abstands des Endpunkts (E) der äußeren Führung (6) des Abgasdiffusors von einer Mittellinie (31) der Schaufel (3) der letzten Stufe zum Abstand (L1 ) zwischen der Basis (2) der Schaufel der letzten Stufe und dem Statorkörper über der Spitze der Schaufel der letzten Stufe (3) liegt zwischen 0,45 und 0,6.
- Abgasdiffusor nach Anspruch 1 oder 2, wobei die Innenführung (7) drei Wendepunkte (A, B, C, D) enthält, und eine Neigung der geneigten Wand (70) gegenüber der Längsachse des Dampfturbine ist im ersten Wendepunkt (A) durch den Neigungswinkel (α) von 42° gegeben.
- Abgasdiffusor nach Anspruch 3, wobei das Verhältnis einer axialen Länge (LAL ) des Abgasdiffusors zu einem Abstand (L1 ) zwischen der Basis (2) der Schaufel der letzten Stufe und dem Statorkörper über der Spitze des Schaufel der letzten Stufe (3) zwischen 1,36 und 1,40 liegt, das Verhältnis des Abstands des Endpunkts (E) der Außenführung (6) des Abgasdiffusors von der Mittellinie (31) der Schaufel der letzten Stufe (3) zu einem Abstand (L1 ) zwischen der Basis (2) der Schaufel der letzten Stufe und dem Statorkörper über der Spitze der Schaufel der letzten Stufe (3) zwischen 0,46 und 0,5 liegt, und das Verhältnis der Austrittsfläche (S2) zum Eintrittsfläche (S1) beträgt 1,8.
- Abgasdiffusor nach Anspruch 1 oder 2, wobei die innere Führung (7) vier Wendepunkte (A, B, C, D) umfasst, wobei ein letzter Wendepunkt (D) ist ein Wendepunkt in einem Schnittpunkt einer Seitenwand und einer Oberseite (41) eines Abgasgehäuses (4), ein zweiter Wendepunkt (C) im Schnittpunkt der geneigten Wand der Innenführung (7) und der Seitenwand des Abgasgehäuses positioniert ist, und der dritte Wendepunkt (B) in einem Abstand von der Seitenwand des Abgasgehäuses zwischen dem ersten Wendepunkt (A) und dem zweiten Wendepunkt (C) positioniert ist;
und die Neigung der geneigten Wand (71, 72) bezüglich der Längsachse der Dampfturbine an einem ersten Wendepunkt (A) durch einen Neigungswinkel (α) von 10° bis 20°, vorzugsweise 15° gegeben ist, und am dritten Wendepunkt (B) durch einen Neigungswinkel (β) von 50° bis 60°, vorzugsweise 55°. - Abgasdiffusor nach einem der vorhergehenden Ansprüche, wobei die geneigte Wand (70, 71, 72) der Innenführung (7) mit einer Rotorgehäusedichtung verbindbar ist.
- Abgasdiffusor nach einem der vorhergehenden Ansprüche, wobei die Außenführung (6) einteilig ist.
- Abgasdiffusor nach einem der vorhergehenden Ansprüche 1 bis 6, wobei die Außenführung einen ersten Teil (61) mit einem Endbereich und einen zweiten Teil (62) mit einem Anfangsbereich umfasst, wobei der erste (61) und wobei der zweite (62) Teil durch einen Schlitz (63) zum Einblasen von Dampf in einen Abgasführungskanal (5) getrennt ist, so dass der Endbereich des ersten Teils (61) der Außenführung (6) und der Anfangsbereich des zweiten Teils (62) der Außenführung (6) zu einem Überlappungsbereich überlappen und in diesem Überlappungsbereich oder zumindest in einem Teil (dparallel ) davon der Endbereich des ersten Teils (61) der Außenführung (6) und der Anfangsbereich des zweiten Teils (62) der Außenführung (6) parallel sind.
- Abgasdiffusor nach Anspruch 8, wobei der Endbereich des ersten Teils (61) der Außenführung (6) und der Anfangsbereich des zweiten Teils (62) der Außenführung (6) an einem Winkel (γ) von weniger als 5°, vorzugsweise an einem Winkel von weniger als 3°, positioniert sind.
- Abgasdiffusor nach einem der vorhergehenden Ansprüche, ferner umfassend eine obere Wand (41) und eine Führungsrippe (8), die an der oberen Wand (41) befestigt ist und sich radial nach innen erstreckt.
- Abgasdiffusor nach Anspruch 10, wobei die Führungsrippe (8) in einem Abstand im Bereich zwischen 1,2*m und 1,9*m von einer Innenfläche der Seitenwand des Abgasgehäuses positioniert ist, wobei der Parameter m definiert ist als Abstand des Endpunktes der Außenführung des Abgasdiffusors der Dampfturbine von der Innenfläche der Seitenwand.
- Abgasdiffusor nach Anspruch 10 oder 11, wobei eine Höhe der Führungsrippe (8) im Bereich von 0,05*H bis 0,15*H liegt, wobei H eine Höhe der Dampfturbine zwischen einer horizontalen Ebene des Längsachse und dem höchsten Punkt der oberen Wand ist.
- Dampfturbine mit einem Abgasdiffusor nach einem der Ansprüche 1 bis 12.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP18206751.2A EP3653850B1 (de) | 2018-11-16 | 2018-11-16 | Abgasdiffusor für eine dampfturbine und zugehörige dampfturbine |
PL18206751T PL3653850T3 (pl) | 2018-11-16 | 2018-11-16 | Dyfuzor wylotowy turbiny parowej i odpowiadająca mu turbina parowa |
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EP18206751.2A EP3653850B1 (de) | 2018-11-16 | 2018-11-16 | Abgasdiffusor für eine dampfturbine und zugehörige dampfturbine |
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EP3653850A1 EP3653850A1 (de) | 2020-05-20 |
EP3653850B1 true EP3653850B1 (de) | 2021-09-29 |
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JP7458947B2 (ja) * | 2020-09-15 | 2024-04-01 | 三菱重工コンプレッサ株式会社 | 蒸気タービン |
CN114508392B (zh) * | 2021-12-29 | 2023-07-18 | 东方电气集团东方汽轮机有限公司 | 一种汽轮机高压进汽室结构 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CS275328B2 (en) | 1989-09-20 | 1992-02-19 | Skoda Kp | Annular diffuser for steam turbine |
US6261055B1 (en) * | 1999-08-03 | 2001-07-17 | Jerzy A. Owczarek | Exhaust flow diffuser for a steam turbine |
US8475125B2 (en) * | 2010-04-13 | 2013-07-02 | General Electric Company | Shroud vortex remover |
US20130243564A1 (en) | 2012-03-14 | 2013-09-19 | Prakash Bavanjibhai Dalsania | Exhaust diffuser for turbine |
EP3299592B1 (de) * | 2016-09-21 | 2020-03-18 | Doosan Skoda Power S.r.o. | Abdampfgehäuse für ein niederdruckdampfturbinensystem |
-
2018
- 2018-11-16 PL PL18206751T patent/PL3653850T3/pl unknown
- 2018-11-16 EP EP18206751.2A patent/EP3653850B1/de active Active
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PL3653850T3 (pl) | 2022-02-07 |
EP3653850A1 (de) | 2020-05-20 |
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