EP3653850A1 - Exhaust diffuser for a steam turbine and corresponding turbine - Google Patents
Exhaust diffuser for a steam turbine and corresponding turbine Download PDFInfo
- Publication number
- EP3653850A1 EP3653850A1 EP18206751.2A EP18206751A EP3653850A1 EP 3653850 A1 EP3653850 A1 EP 3653850A1 EP 18206751 A EP18206751 A EP 18206751A EP 3653850 A1 EP3653850 A1 EP 3653850A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust diffuser
- outer guide
- last stage
- guide
- exhaust
- 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.)
- Granted
Links
- 230000004323 axial length Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction 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
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
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
- F01D25/30—Exhaust heads, chambers, or the like
-
- 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
-
- 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
-
- 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
-
- 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 exhaust system leads the steam into the condenser, heat exchanger, or into an industrial process using the steam.
- the system may be oriented vertically or horizontally, typically a vertical downward orientation is provided, in order to ensure the uniform and efficient discharge of the expanded steam.
- 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.
- 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 at least two, but preferably not more than 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 preferably 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 preferably 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 2 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 turbine 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
- 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. Once the steam has passed the last row of blades of the steam turbine, it is directed through the guiding channel and its outlet into the inner space of the exhaust system surrounded by the exhaust casing. The exhaust system leads the steam into the condenser, heat exchanger, or into an industrial process using the steam. The system may be oriented vertically or horizontally, typically a vertical downward orientation is provided, in order to ensure the uniform and efficient discharge of the expanded steam.
- 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.
- To achieve this goals,
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. - Further according to
US 2013/0243564 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°. - It is also explained that the higher curvature of the outer guide surface may lead to a flow separation from the outer guide surface, which in turn has negative effects on static pressure recovery. In order to prevent or at least reduce the above-described undesired effects,
US 2013/0243564 uses over tip leakage of the last stage blade. - There is no detailed information provided in
US 2013/0243564 with respect to the inner guide, however, it appears to have at least four inflection points, the first inflection point being positioned relatively far from the blade centerline, such that the first part of the inner guide between the blade and the first inflection point is parallel with the longitudinal axis of the turbine. -
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. - It is the aim of the present invention to provide an exhaust diffuser assembly for a steam turbine with improved efficiency while keeping the axial length of the exhaust as low as possible.
- 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 at least two, but preferably not more than four inflection points that serve to adjust the shape of the wall to guide the steam as smoothly as possible.
- Preferably, 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. Thus, 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. Optionally, 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.
- Preferably, the inclined wall of the inner guide is not connected to the base of the last stage blades. On contrary, due to a possible relative movement of individual parts, a space between the base of the last stage blades and the first inflection point, i.e. the inclined wall, is advantageous. 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. Preferably, 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. Preferably, 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.
- In an embodiment, where there are four inflection points provided, 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 preferably 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. Whereas the first inflection point is positioned in the plane of the blade base, i.e. in a radial distance from the longitudinal axis of the turbine that corresponds to the radius of the rotor disc, 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.
- In order to ensure a smooth flow of the steam through the slit and into the exhaust, 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. Preferably, 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°. Most preferably, 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. Preferably, 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 preferably between 1,45 and 1,85.
- In a preferred embodiment, 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 - 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.
- The above described configuration of the exhaust system leads to the efficiency improvement of up to 6% of last stage blade efficiency in comparison with traditional shape of low pressure diffuser.
-
-
Fig. 1 shows the cross-sectional view of the steam turbine exhaust according to example 1, i.e. with the inner guide having four inflection points and with the outer guide being formed of one part. -
Fig. 2 shows the cross-sectional view of the steam turbine exhaust according to example 2, i.e. with the inner guide having four inflection points and with the outer guide being formed of two parts, defining the slit for blowing in the steam from the steam-collecting chamber, with a detailed view of the slit. -
Fig. 3 shows the cross-sectional view of the steam turbine exhaust according to example 3, i.e. with the inner guide having three inflection points and with the outer guide being formed of two parts, defining the slit for blowing in the steam from the steam-collecting chamber. -
Fig. 4 shows the efficiency improvement of the last stage of the turbine and the diffuser with the geometry of the diffuser according to the present invention. - The present invention is further illustrated by way of examples of preferred embodiments of several possible configurations of the outer guide and the inner guide for the low pressure steam turbine system, described in the following with references to the attached figures, which show vertical cross-section of a quadrant of the exhaust diffuser. The examples should not be construed as limiting the claimed scope. The relevant parameters of the exhaust diffuser geometry are summarized in the following Table 1.
Table 1: Relevant parameters of the exhaust diffuser geometry Parameter Example 1 Example 2 Example 3 Dp 1880 mm 1880 mm 2050 mm LLSB 1220 mm 1220 mm 1370 mm L1 1250 mm 1250 mm 1390 mm LAL 1820 - 1860 mm 1600 - 1640 mm 1890 - 1940 mm α 15° 15° 42° β 55° 55° -- xE 670 - 730 mm 575 - 610 mm 645 - 690 mm LAL / L 11,45-1,49 1,28 - 1,31 1,36 - 1,40 xE / L1 0,54 - 0,58 0,46 - 0,49 0,46 - 0,5 S1 12,3 m2 12,3 m2 15,0 m2 S2 20,97 m2 18,2 m2 27,1 m2 S2 / S 1,7 1,48 1,8 - In Example 1 and with the reference to
Fig. 1 and Table 1, the length of thelast stage blade 3 is LLSB =1220 mm, the distance between thebase 2 of the last stage blade and the stator body above the tip of that blade is L1 =1250 mm and the diameter of the rotor disc is Dp = 1880 mm. Theouter guide 6 comprises one part. - In this particular embodiment, the
inner guide 7 has four inflection points - A, B, C, D. The first inflection point A is positioned close to the base of thelast stage blades 3 and it is identical with the beginning of theinclined wall 71 of theinner guide 7. Theinclined 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 aside wall 42 and the top 41 of theexhaust casing 4. The second inflection point C is positioned in the intersection of theinclined wall 72 of the inner guide and theside wall 42 of theexhaust casing 4, so that the distance of the second inflection point (or the distance of the last inflection point) from thecenterline 31 of thelast stage blades 3 determines the axial length LAL of the exhaust diffuser. The ratio of the axial length LAL to the distance L1 between thebase 2 of the last stage blade and the stator body above the tip of that blade may be between 1,45-1,49. - In this particular embodiment, 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. Thefirst part 71 of the inclined wall is inclined by α =15° with respect to the longitudinal axis of the steam turbine assembly and thesecond part 72 of the inclined wall is inclined by β =55° with respect to the longitudinal axis of the steam turbine assembly. - The ratio of the distance of the endpoint E from the
centerline 31 of thelast stage blade 3 and the distance L1 between the base of the last stage blade and the stator body above the tip of that blade lies between 0,54 - 0,58 and the ratio of the outlet area S2 to the inlet area S1 , is approximately 1,7, wherein the inlet area is determined by the rotor diameter DP and by distance L1 between the base of the last stage blade and the stator body above the tip of that blade and the outlet area is determined by the distance of the endpoint of the outer guide from the side wall of the exhaust casing m = LAL - xE (m not shown) and by the radial distance of the endpoint of the outer guide. - In example 2 and with the reference to
Fig. 2 and Table 1, the length of the last stage blade is LLSB =1220 mm, the distance between thebase 2 of the last stage blade and the stator body above the tip of that blade is L1 =1250 mm and the diameter of the rotor disc is Dp = 1880 mm. Although these basic dimensions are not shown inFig. 2 , they are measured in the same way as shown inFig, 1 . - The
outer guide 6 comprises twoparts 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 thefirst part 61 of theouter guide 6 and thesecond part 62 of theouter guide 6 and the end region of thefirst part 61 of theouter guide 6 and the starting region of thesecond part 62 of theouter guide 6 are parallel or substantially parallel in the overlapping region dparallel , 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 γ ≤ 3° as can be seen in the detail insert inFig. 2 . - In this particular embodiment, the
inner guide 7 has again four inflection points - A, B, C, D. The inclination of the two parts of the inclined wall of the inner guide is identical to the inclination given in example 1, i.e. thefirst part 71 of the inclined wall is inclined by α = 15° with respect to the longitudinal axis of the steam turbine assembly and thesecond part 72 of the inclined wall is inclined by β =55° with respect to the longitudinal axis of the steam turbine assembly, but the second and the last inflection points are positioned at a distance from thecenterline 31 of the last stage blade that is shorter than in example 1. - Thus, the ratio of the axial length LAL to the length L1 is between 1,28 - 1,31. The ratio of the distance xE of the endpoint E from the
centerline 31 of the last stage blade and L1 is 0,46 - 0,49 and the ratio of the outlet area S2 to the inlet area S1 , is approximately 1,48. - In example 3 and with the reference to
Fig. 3 and Table 1, the length of the last stage blade is LLSB =1370 mm, the distance between thebase 2 of the last stage blade and the stator body above the tip of that blade is L1 =1390 mm and the diameter of the rotor disc is Dp = 2050 mm. Although these basic dimensions are not shown inFig. 3 , they are measured in the same way as shown inFig, 1 . - The
outer guide 6 comprises twoparts slit 63 between them, through which a steam is tangentially blown into the inner space of the diffuser. Theslit 63 is positioned as defined in example 2. - In this particular embodiment, the
inner guide 7 comprises three inflection points - A, C, D. The first inflection point A is positioned behind the base of thelast stage blades 3 and it is identical with the beginning of theinclined wall 70 of theinner guide 7. Theinclined 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 aside wall 42 and the top 41 of theexhaust casing 4. The second inflection point C is positioned in the intersection of the inclinedinner guide 7 and theside wall 42 of theexhaust casing 4. - In this particular embodiment, there is no third inflection point, so that the
inclined wall 70 of theinner guide 7 is only formed of one part, which is inclined by 42° with respect to the longitudinal axis of the steam turbine assembly. - The ratio of the axial length LAL to L1 is between 1,36 and 1,40. The ratio of the distance xE of the endpoint E from the
centerline 31 of thelast stage blade 3 and L1 lies between 0,46 and 0,5 and the ratio of the outlet area S2 to the inlet area S1 , is approximately 1,8. - 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 inFigs, 1 ,2 and3 . The guidingrib 8 is attached to theupper wall 41 of theexhaust 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 theside wall 42 of the turbine 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., LAL - xE. - 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 thediffuser 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.
Claims (15)
- An exhaust diffuser for a steam turbine comprising an inlet area (S1 ) and an outlet area (S2 ), an inner guide (7) and an outer guide (6) having an endpoint (E), wherein the inner guide (7) comprises an inclined wall (70, 71, 72) with at least two inflection points (A, B, C, D), wherein the inclination of the inclined wall (70, 71, 72) with respect to the longitudinal axis of the steam turbine is given at the inflection points, wherein the inner guide (7) is adapted so that a ratio of the axial length (LAL ) of the exhaust diffuser to the distance (L1 ) between a base (2) of the last stage blade and a stator body above the tip of the last stage blade (3) is between 1,25 and 1,5, and wherein the outer guide (6) is adapted so that the ratio of the outlet area (S2 ) to the inlet area (S1 ) is between 1,45 and 1,85.
- The exhaust diffuser according to claim 1, wherein the ratio of the distance (xE ) of the endpoint (E) of the outer guide (6) of the exhaust diffuser to the distance (L1 ) between the base (2) of the last stage blade and the stator body above the tip of the last stage blade (3) is between 0,45 and 0,6.
- The exhaust diffuser according to claim 1 or 2, wherein the inner guide (7) comprises at least three inflection points (A, B, C, D) and / or the inclination of the inclined wall (70) with respect to the longitudinal axis of the turbine is given at a first inflection point (A) by an inclination angle (α) of 40° to 45°, preferably 42°.
- The exhaust diffuser according to claim 3, wherein the ratio of the axial length (LAL ) of the exhaust diffuser to the distance (L1 ) between the base (2) of the last stage blade and the stator body above the tip of the last stage blade (3) is between 1,36 and 1,40, the ratio of the distance (xE ) of the endpoint (E) of the outer guide (6) of the exhaust diffuser to the distance (L1 ) between the base (2) of the last stage blade and the stator body above the tip of the last stage blade (3) is between 0,46 and 0,5, and the ratio of the outlet area (S2 ) to the inlet area (S1 ) is about 1,8.
- The exhaust diffuser according to claim 1 or 2, wherein the inner guide (7) comprises four inflection points (A, B, C, D) and / or the inclination of the inclined wall (71, 72) with respect to the longitudinal axis of the turbine is given at a first inflection point(A) by an inclination angle (α) of 10° to 20°, preferably 15° and at the third inflection(B) point by an inclination angle (β) of 50° to 60°, preferably 55°.
- The exhaust diffuser according to anyone of the preceding claims, wherein the inner (7) guide has no more than four inflection points.
- The exhaust diffuser according to anyone of the preceding claims, wherein the first inflection point (A) is identical with the beginning of the inclined wall (70, 71, 72).
- The exhaust diffuser according to anyone of the preceding claims, wherein the inclined wall (70, 71, 72) of the inner guide (7) is adapted to be connected to a rotor casing sealing.
- The exhaust diffuser according to anyone of the preceding claims, wherein the outer guide (6) comprises one part.
- The exhaust diffuser according to anyone of the preceding claims 1 to 8, wherein the outer guide comprises a first part (61) having an end region and a second part (62) having a starting region, the first (61) and the second (62) part being separated by a slit (63) for blowing in a steam into the exhaust guiding channel (5) such that the end region of the first part (61) of the outer guide (6) and a starting region of the second part (62) of the outer guide (6) overlap to create an overlapping region and, in this overlapping region, or at least in a part (dparallel ) of it, 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 substantially parallel.
- The exhaust diffuser according to claim 10, wherein 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 positioned at an angle (γ) of less than 5°, preferably at an angle of less than 3°.
- The exhaust diffuser according to any of the preceding claims further comprising an upper wall (41) and a guiding rib (8) attached to an upper wall (41) and extending radially inwards.
- The exhaust diffuser according to claim 12, wherein 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 of the turbine casing, wherein the parameter m is defined as a distance of the end point of an outer guide of a diffuser of the steam turbine system from the inner surface of the side wall.
- The exhaust diffuser according to claim 12 or 13, wherein the height of the guiding rib (8) 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.
- A turbine comprising an exhaust diffuser according to any one of claims 1 to 14.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL18206751T PL3653850T3 (en) | 2018-11-16 | 2018-11-16 | Exhaust diffuser for a steam turbine and corresponding steam turbine |
EP18206751.2A EP3653850B1 (en) | 2018-11-16 | 2018-11-16 | Exhaust diffuser for a steam turbine and corresponding steam turbine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18206751.2A EP3653850B1 (en) | 2018-11-16 | 2018-11-16 | Exhaust diffuser for a steam turbine and corresponding steam turbine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3653850A1 true EP3653850A1 (en) | 2020-05-20 |
EP3653850B1 EP3653850B1 (en) | 2021-09-29 |
Family
ID=64331924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18206751.2A Active EP3653850B1 (en) | 2018-11-16 | 2018-11-16 | Exhaust diffuser for a steam turbine and corresponding steam turbine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3653850B1 (en) |
PL (1) | PL3653850T3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114508392A (en) * | 2021-12-29 | 2022-05-17 | 东方电气集团东方汽轮机有限公司 | High-pressure steam inlet chamber structure of steam turbine |
EP3998397A1 (en) * | 2020-09-15 | 2022-05-18 | Mitsubishi Heavy Industries Compressor Corporation | Steam turbine with diffuser |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0418887A1 (en) | 1989-09-20 | 1991-03-27 | Skoda Koncern Plzen | Annular diffusor for steam turbines |
US6261055B1 (en) * | 1999-08-03 | 2001-07-17 | Jerzy A. Owczarek | Exhaust flow diffuser for a steam turbine |
US20110250064A1 (en) * | 2010-04-13 | 2011-10-13 | General Electric Company | Shroud vortex remover |
US20130243564A1 (en) | 2012-03-14 | 2013-09-19 | Prakash Bavanjibhai Dalsania | Exhaust diffuser for turbine |
EP3299592A1 (en) * | 2016-09-21 | 2018-03-28 | Doosan Skoda Power S.r.o. | Exhaust casing for a low pressure steam turbine system |
-
2018
- 2018-11-16 EP EP18206751.2A patent/EP3653850B1/en active Active
- 2018-11-16 PL PL18206751T patent/PL3653850T3/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0418887A1 (en) | 1989-09-20 | 1991-03-27 | Skoda Koncern Plzen | Annular diffusor for steam turbines |
US6261055B1 (en) * | 1999-08-03 | 2001-07-17 | Jerzy A. Owczarek | Exhaust flow diffuser for a steam turbine |
US20110250064A1 (en) * | 2010-04-13 | 2011-10-13 | General Electric Company | Shroud vortex remover |
US20130243564A1 (en) | 2012-03-14 | 2013-09-19 | Prakash Bavanjibhai Dalsania | Exhaust diffuser for turbine |
EP3299592A1 (en) * | 2016-09-21 | 2018-03-28 | Doosan Skoda Power S.r.o. | Exhaust casing for a low pressure steam turbine system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3998397A1 (en) * | 2020-09-15 | 2022-05-18 | Mitsubishi Heavy Industries Compressor Corporation | Steam turbine with diffuser |
CN114508392A (en) * | 2021-12-29 | 2022-05-17 | 东方电气集团东方汽轮机有限公司 | High-pressure steam inlet chamber structure of steam turbine |
Also Published As
Publication number | Publication date |
---|---|
PL3653850T3 (en) | 2022-02-07 |
EP3653850B1 (en) | 2021-09-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5257906A (en) | Exhaust system for a turbomachine | |
US5518366A (en) | Exhaust system for a turbomachine | |
US3861826A (en) | Cascade diffuser having thin, straight vanes | |
US6533546B2 (en) | Low-pressure steam turbine with multi-channel diffuser | |
US5277549A (en) | Controlled reaction L-2R steam turbine blade | |
US7300247B2 (en) | Axial flow turbine | |
US11408439B2 (en) | Centrifugal compressor and turbocharger | |
US5791873A (en) | Multi-stage blade system | |
EP3653850B1 (en) | Exhaust diffuser for a steam turbine and corresponding steam turbine | |
US10590774B2 (en) | Turbine bucket for control of wheelspace purge air | |
JPH05195991A (en) | Centrifugal compressor | |
CN107313860B (en) | A kind of blade profile for cooling system of prewhirling receives pore structure | |
US10989074B2 (en) | Turbine exhaust hood | |
US20090068006A1 (en) | Tilted Cone Diffuser for Use with an Exhaust System of a Turbine | |
US11319820B2 (en) | Blade or guide vane with raised areas | |
JP2005320869A (en) | Suction casing, suction passage structure and fluid machine | |
JP2009057959A (en) | Centrifugal compressor, its impeller, and its operating method | |
US11073124B2 (en) | Hydraulic turbine | |
Hohlweg et al. | Comparison of conventional and low solidity vaned diffusers | |
US10626727B2 (en) | Turbine bucket for control of wheelspace purge air | |
JPH0719005A (en) | Labyrinth seal device | |
KR100433324B1 (en) | Centrifugal compressor | |
CN106640754A (en) | Novel centrifugal compressor with annular protruding structure | |
JPH0610603A (en) | Stress reducing type radial flow impeller blade | |
JPH07102903A (en) | Stress reduction type impeller blade |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20201112 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20210419 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: AT Ref legal event code: REF Ref document number: 1434368 Country of ref document: AT Kind code of ref document: T Effective date: 20211015 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602018024205 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211229 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211229 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20210929 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1434368 Country of ref document: AT Kind code of ref document: T Effective date: 20210929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20211230 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220129 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220131 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602018024205 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20211116 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20211130 |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20211130 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20220630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20211116 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: PL Payment date: 20221024 Year of fee payment: 5 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210929 Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20181116 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230713 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20231120 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: TR Payment date: 20231106 Year of fee payment: 6 Ref country code: IT Payment date: 20231120 Year of fee payment: 6 Ref country code: FR Payment date: 20231115 Year of fee payment: 6 Ref country code: DE Payment date: 20231121 Year of fee payment: 6 Ref country code: CZ Payment date: 20231107 Year of fee payment: 6 Ref country code: CH Payment date: 20231202 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: PL Payment date: 20231110 Year of fee payment: 6 |