EP2436885B1 - Steam turbine with a blindwall between adjacent pressure sections - Google Patents
Steam turbine with a blindwall between adjacent pressure sections Download PDFInfo
- Publication number
- EP2436885B1 EP2436885B1 EP10182377.1A EP10182377A EP2436885B1 EP 2436885 B1 EP2436885 B1 EP 2436885B1 EP 10182377 A EP10182377 A EP 10182377A EP 2436885 B1 EP2436885 B1 EP 2436885B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- pressure section
- casing
- blindwall
- annular
- 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.)
- Not-in-force
Links
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
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
-
- 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
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/243—Flange connections; Bolting arrangements
-
- 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
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
-
- 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
- F05D2260/00—Function
- F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
- F05D2260/941—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF] particularly aimed at mechanical or thermal stress reduction
Definitions
- the present invention relates to a steam turbine comprising a rotor, a blading and a casing comprising two parts, whereby the two casing parts are fixed together at their splitplane with several splitplane bolts.
- the steam turbine comprises a first pressure section and a second pressure section, whereby the pressure sections are separated from each other by an annular blindwall.
- Each pressure section comprises a steam inlet and a steam outlet, whereby the steam outlet of the first pressure section and the steam inlet of the second pressure section are arranged next to the blindwall.
- a bypass for guiding steam from the first pressure section to the second pressure section is arranged outside the casing, whereby a reheater is arranged at the bypass for reheating the steam in the bypass.
- JP H04 8703 U A steam turbine of that kind is shown in JP H04 8703 U .
- the JP H04 8703 U discloses a casing comprising two casing parts which are fixed together at a splitplane. Further the steam turbine comprises a first pressure section and a second pressure section.
- the first pressure side of such a steam turbine is impinged with a high pressure.
- the second pressure side of the steam turbine is impinged with a low pressure or an intermediate pressure.
- Steam turbines are mechanical devices which extract thermal energy from pressurized steam and convert it into a rotary motion. In reheated steam turbines the steam flow exits the high pressure section of the steam turbine, is reheated by an external reheater and is returned to the second pressure section of the steam turbine and continues its expansion.
- the different pressure sections are divided by a blindwall which is arranged between the rotor of the steam turbine and the casing of the steam turbine.
- the casing of the steam turbine is divided into two casing parts. The two parts are connected at their splitplane by several splitplane bolts.
- the temperature at the inlet of the first pressure section, which is the high pressure side of the steam turbine, and the temperature at the steam outlet of the first pressure section can be very different. That means the temperature gradient between the temperature at the steam inlet and the steam outlet of the first pressure section can be more than 100 degrees Celsius, often mot than 200 or more degrees Celsius.
- the reheated steam coming from the first pressure section which is introduced at the steam inlet at the second pressure section has normally the same or nearly the same temperature like the temperature at the steam inlet at the first pressure section. Therefore at the area of the blindwall a temperature difference of hundred or more degrees Celsius, often more than 200 degrees Celsius is normal.
- splitplane bolts are used for the fixation of the two casing parts of the steam turbine only a small temperature gradient is allowed over the splitplane to cause no damage at the casing and/or at the splitplane of the two casing parts because of high thermal stresses.
- An object of the present invention is to provide a steam turbine which can take a high temperature gradient over the blindwall and/or which allows to use small splitplane bolts for the fixation of the two parts of the casing of the steam turbine to reduce costs of the steam turbine.
- Such a steam turbine enables to introduce steam with an intermediate temperature into the annular chamber.
- the advantage of introducing steam with an intermediate temperature into the annular chamber is that the temperature gradient over the splitplane can be reduced, so that higher temperature gradients can be taken over the blindwall and/or smaller splitplane bolts can be used for the fixation of the two parts of the casing of the steam turbine. That means the temperature difference between the first pressure section and the second pressure section can be more than 200 degrees Celsius without causing damages at the splitplane of the casing parts, in particular in the area of the splitplane where the blindwall is arranged.
- the blindwall can comprise a first annular wall, a second annular wall and an annular main body, whereby the main body is arranged at the rotor of the steam turbine, wherein the annular chamber is build by the first wall, the second wall, the main body and the annular part of the inner surface of the casing.
- the annular main body of the blindwall is arranged at the rotor.
- the connection between the main body of the blindwall and the rotor is sealed by a sealing element.
- the first annular wall and the second annular wall can be of the same size and shape. It is also possible that the first annular wall and the second annular wall have different sizes and shapes. Preferably both annular walls run parallel to each other.
- the size of the annular chamber can be different, as well.
- the main body can be of a small size, so that the annular chamber extends approximately over the whole radial extension between the casing and the rotor.
- the main body of the blindwall can extend approximately over the whole radial extension between the casing and the rotor, so that the annular chamber is arranged near to the casing of the steam turbine.
- the crucial factor is that the inner surface of the casing and of the splitplane of both casing parts can be heated up by the introduced steam, so that the temperature gradient over the inner surface of the casing and the splitplane is uniform and the thermal stresses in that part of the steam turbine are reduced.
- the first and the second annular wall are spaced apart from each other, so that the main body is building the bottom part between both walls to contact the rotor of the steam turbine.
- the annular chamber is a circumferential groove in the blindwall with the opening in the direction to the casing of the steam turbine.
- Steam with an intermediate temperature can be introduced through the third steam inlet into the annular chamber where the steam can heat up the inner surface of the casing and the splitplane in this area.
- the introduced steam is guided through the annular chamber and exits the annular chamber through the third steam outlet. It is possible that more than one third steam inlet and more than one third steam outlet are provided in the casing of the steam turbine for guiding steam with an intermediate temperature into and out of the annular chamber.
- the distance between the first annular wall and the second annular wall can be different.
- the casing of the steam turbine can comprise a first annular groove for receiving the first annular wall of the blindwall and a second annular groove for receiving the second annular wall of the blindwall.
- the first annular groove is arranged parallel to the second annular groove in the casing of the steam turbine.
- each groove is at least one sealing element arranged for sealing the annular walls with the casing.
- the arrangement of sealing elements between the first and the second wall and the casing of the steam turbine and the main body of the blindwall and the rotor of the steam turbine enables a secure sealing between the first pressure section and the second pressure section of the steam turbine.
- the third steam inlet for introducing steam with an intermediate temperature can be connected to an external steam source. That means the steam flow from the first pressure section via the bypass to the second pressure section is separated from the steam flow to the annular chamber of the blindwall. This enables a very unique supply of steam with a certain intermediate temperature into the annular chamber.
- the supply of steam from an external source enables that no fluctuations of the intermediate temperature of the steam can occur.
- the external steam source comprises a reheater or is connected to a reheater to heat up the steam temperature which is introduced into the annular chamber to the desired temperature.
- the third steam inlet of the casing can be connected to the bypass between the steam outlet of the first pressure section and the steam inlet of the second pressure section.
- steam with an intermediate temperature can be drawn of the bypass and can be introduced into the annular chamber.
- the connection from the third steam inlet of the casing to the bypass between the steam outlet of the first pressure section and the steam inlet of the second pressure section can be realized by a pipe.
- the connection is preferably arranged in such a way that the reheater which is arranged at the bypass for reheating the steam can heat up the steam which is guided to the annular chamber to the desired intermediate temperature, whereby the rest of the steam which is guided through the bypass into the second pressure section can be further heated up to a higher temperature.
- connection of the pipe can be in a middle part of the reheater, so that the steam coming from the steam outlet of the first pressure section is heated up to an intermediate temperature when reaching the connection to the third steam inlet of the casing.
- the steam which flows through the whole reheater is heated more than the part of the steam which is guided through the pipe into the annular chamber of the blindwall.
- a different steam turbine can comprise two reheaters which are arranged in series, whereby the connection and the pipe, respectively, for guiding steam into the annular chamber is arranged between both reheaters. This enables that the steam coming from the steam outlet of the first pressure section can be reheated in the first reheater up to an intermediate temperature and can be reheated in the second reheater to a higher temperature.
- the steam turbine is built for introducing steam into the annular chamber, whereby the steam is having a temperature between the temperature of the steam at the steam outlet of the first pressure section and the temperature of the steam at the steam inlet of the second pressure section.
- hot steam which enters the first pressure section which is the high pressure side of the steam turbine, with a temperature of 400 degrees Celsius exits the steam outlet of the first pressure section with a temperature of 200 degrees Celsius.
- the steam is guided through the bypass from the steam outlet of the first pressure section to the steam inlet of the second pressure section, whereby a reheater heats up again the steam to a temperature of 400 degrees Celsius.
- a different steam can be heated up to an intermediate temperature of for example 300 degrees Celsius.
- This second steam with the intermediate temperature of 300 degrees Celsius is introduced into the annular chamber for heating up the inner surface of the casing and the splitplane of the casing parts in the area of the blindwall.
- Fig. 1 shows schematically a sectional view of a steam turbine 40 comprising a rotor 20, several bladings 21 and a casing 22, whereby only one part of the casing 22 is shown, so that the splitplane 23 of this part of the casing 22 can be seen. Further several splitplane bolts 24 are shown, which enables the fixation of the two casing parts together at their splitplane 23.
- the steam turbine 40 comprises a first pressure section 30 and a second pressure section 35.
- the pressure sections 30, 35 are separated from each other by an annular blindwall 1.
- the annular blindwall 1 is arranged between the rotor 20 and the inner surface 26 of the casing 22.
- Both pressure sections 30, 35 comprise a steam inlet and a steam outlet, whereby the steam outlet of the first pressure section 30 and the steam inlet of the second pressure section 35 are arranged next to the blindwall 1.
- the first pressure section 30 is the high pressure side of the steam turbine 40 and the second pressure section 35 can be the intermediate or low pressure side of the steam turbine 40.
- the blindwall 1 and an annular part 25 of the inner surface 26 of the casing 22 are building an annular chamber 2.
- steam with an intermediate temperature can be introduced for heating up the annular part 25 of the inner surface 26. This results in a reduction of the temperature gradient over the splitplane 23 in the area of the blindwall 1.
- the temperature differences between the temperature in the first pressure section 30 and the temperature in the second pressure section 35 can be high, in particular more than 200 degrees Celsius.
- the reduction of the temperature gradient over the splitplane 23 in the area of the blindwall 1 allows to use splitplane bolts 24 of a small size. Therefore the costs of the steam turbine 40 can be reduced.
- Fig. 2 shows schematically a sectional view of both pressure sections 30, 35 which are separated by the blindwall 1, which is constructed according to the invention.
- Both pressure sections 30, 35 are connected with each other by a bypass 10. That means, a steam outlet of the first pressure section 30 is connected by the bypass 10 with the steam inlet of the second pressure section 35.
- a reheater 11 which is arranged at the bypass 10 and enables to introduce the reheated steam into the second pressure section 35.
- the additional connection between the annular chamber 2 and the bypass 10 allows introducing parts of the steam flow into the annular chamber 2 of the blindwall 1.
- the specific arrangement of the reheater 11 at the bypass 10 enables that the steam which is introduced into the annular chamber 2 can be heated up to an intermediate temperature, which lies between the temperature of the steam at the steam outlet of the first pressure section 30 and temperature of the reheated steam at the steam inlet at the second pressure side 35.
- Fig. 3 shows schematically an increased sectional view of the arrangement of the blindwall 1 between the rotor 20 and the casing 22 of the steam turbine 40.
- the arrows show the steam flow which exits the first pressure section 30 at the steam outlet 31 and which is partly introduced into the annular chamber 2 of the blindwall 1 and which is partly introduced into the second pressure section 35 through the steam inlet 36.
- the steam outlet 31 at the first pressure section 30 is connected with the steam inlet 36 at the second pressure section 35 by the bypass 10.
- the reheater 11 is arranged in such a way to the bypass 10 that the steam which can be introduced into the annular chamber 2 can reach an intermediate temperature, whereby the steam which is introduced through the steam inlet 36 into the second pressure section 35 can be fully heated up.
- the steam which is introduced into the annular chamber 2 reaches an intermediate temperature which lies between, in particular in the middle between, the temperature of the steam in the steam outlet 31 of the first pressure section 30 and the temperature of the steam in the steam inlet 36 at the second pressure section 35.
- the circumferential part 25 of the inner surface 26 of the casing 22 which is building one border of the annular chamber 2 can be heated up by the introduced steam, so that the temperature gradient over the splitplane 23 of the casing 22 can be reduced. This allows higher temperature differences between both pressure sections 30, 35.
- the inventive blindwall 1 allows to reduce the size of the splitplane bolts 24, because of the reduced temperature gradient over the splitplane 23 and the reduced thermal stresses in the parts of the casing 22.
- the steam turbine 40 is built in such a way that the steam which is introduced into the annular chamber 2 of the blindwall 1 has always an intermediate temperature which lies between the temperature next to the blindwall 1 at the first pressure section 30 and the temperature next to the blindwall 1 at the second pressure section 35.
- the annular chamber 2 which is built by the first wall 5, the second wall 6, the main body 7 of the blindwall 1 and the annular part 25 of the inner surface 26 of the casing 22 can be of different sizes.
- the annular chamber 2 has advantageously the shape of a circumferential groove.
- the steam turbine 40 can comprise an external steam source.
- the external steam source is built to generate hot steam, which can be introduced by a separate pipe and the third steam inlet 3 into the annular chamber 2 of the blindwall 1.
- a second reheater is arranged at the external steam source to heat up the steam, which can be introduced into the annular chamber 2 of the blindwall 1.
- the first reheater 11 heats up the steam coming from the first pressure section 30.
- the first reheater 11 enables to reheat the steam up to a temperature like the temperature of the steam which is introduced into the first pressure section 30.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
- The present invention relates to a steam turbine comprising a rotor, a blading and a casing comprising two parts, whereby the two casing parts are fixed together at their splitplane with several splitplane bolts. The steam turbine comprises a first pressure section and a second pressure section, whereby the pressure sections are separated from each other by an annular blindwall. Each pressure section comprises a steam inlet and a steam outlet, whereby the steam outlet of the first pressure section and the steam inlet of the second pressure section are arranged next to the blindwall. Between the steam outlet of the first pressure section and the steam inlet of the second pressure section a bypass for guiding steam from the first pressure section to the second pressure section is arranged outside the casing, whereby a reheater is arranged at the bypass for reheating the steam in the bypass.
- A steam turbine of that kind is shown in
JP H04 8703 U JP H04 8703 U - The first pressure side of such a steam turbine is impinged with a high pressure. The second pressure side of the steam turbine is impinged with a low pressure or an intermediate pressure. Steam turbines are mechanical devices which extract thermal energy from pressurized steam and convert it into a rotary motion. In reheated steam turbines the steam flow exits the high pressure section of the steam turbine, is reheated by an external reheater and is returned to the second pressure section of the steam turbine and continues its expansion. The different pressure sections are divided by a blindwall which is arranged between the rotor of the steam turbine and the casing of the steam turbine. The casing of the steam turbine is divided into two casing parts. The two parts are connected at their splitplane by several splitplane bolts.
- The temperature at the inlet of the first pressure section, which is the high pressure side of the steam turbine, and the temperature at the steam outlet of the first pressure section can be very different. That means the temperature gradient between the temperature at the steam inlet and the steam outlet of the first pressure section can be more than 100 degrees Celsius, often mot than 200 or more degrees Celsius. The reheated steam coming from the first pressure section which is introduced at the steam inlet at the second pressure section has normally the same or nearly the same temperature like the temperature at the steam inlet at the first pressure section. Therefore at the area of the blindwall a temperature difference of hundred or more degrees Celsius, often more than 200 degrees Celsius is normal. Because of this high temperature gradient over the splitplane in the steam turbine at the area of the blindwall very strong splitplane bolts are necessary to fix the two parts of the casing together. If small splitplane bolts are used for the fixation of the two casing parts of the steam turbine only a small temperature gradient is allowed over the splitplane to cause no damage at the casing and/or at the splitplane of the two casing parts because of high thermal stresses.
- An object of the present invention is to provide a steam turbine which can take a high temperature gradient over the blindwall and/or which allows to use small splitplane bolts for the fixation of the two parts of the casing of the steam turbine to reduce costs of the steam turbine.
- This object of the invention is solved by a steam turbine according to
claim 1 of the present invention. Advantages and embodiments of the steam turbine are disclosed in the dependent claims of the present invention. - More particularly the object of the invention is solved by a steam turbine with a rotor, with a blading, with a casing comprising two parts, whereby the two casing parts are fixed together at their splitplane with several splitplane bolts, the steam turbine having a first pressure section and a second pressure section, the pressure sections separated from each other by an annular blindwall, each pressure section comprising a steam inlet and a steam outlet, whereby the steam outlet of the first pressure section and the steam inlet of the second pressure section are arranged next to the blindwall, whereby between the steam outlet of the first pressure section and the steam inlet of the second pressure section a bypass for guiding steam from the first pressure section to the second pressure section is arranged outside the casing, whereby a reheater is arranged at the bypass for reheating the steam in the bypass, and whereby the blindwall and an annular part of the inner surface of the casing are building an annular chamber, whereby the casing comprises a third steam inlet and a third steam outlet which are connected to the annular chamber for guiding steam into and out of the annular chamber.
- Such a steam turbine enables to introduce steam with an intermediate temperature into the annular chamber. The advantage of introducing steam with an intermediate temperature into the annular chamber is that the temperature gradient over the splitplane can be reduced, so that higher temperature gradients can be taken over the blindwall and/or smaller splitplane bolts can be used for the fixation of the two parts of the casing of the steam turbine. That means the temperature difference between the first pressure section and the second pressure section can be more than 200 degrees Celsius without causing damages at the splitplane of the casing parts, in particular in the area of the splitplane where the blindwall is arranged. Introducing steam with an intermediate temperature in the middle of the blindwall enables that the temperature gradient over the splitplane part which is arranged between the steam outlet of the first pressure section and the steam inlet of the second pressure section is very uniform. Therefore the thermal stresses in that splitplane part can be reduced in contrast to a steam turbine using a blindwall without such an annular chamber and without introducing steam with an intermediate temperature into the annular chamber.
- In the above described steam turbine the blindwall can comprise a first annular wall, a second annular wall and an annular main body, whereby the main body is arranged at the rotor of the steam turbine, wherein the annular chamber is build by the first wall, the second wall, the main body and the annular part of the inner surface of the casing. The annular main body of the blindwall is arranged at the rotor. Advantageously the connection between the main body of the blindwall and the rotor is sealed by a sealing element. The first annular wall and the second annular wall can be of the same size and shape. It is also possible that the first annular wall and the second annular wall have different sizes and shapes. Preferably both annular walls run parallel to each other. The size of the annular chamber can be different, as well. According to a first preferred embodiment of the blindwall the main body can be of a small size, so that the annular chamber extends approximately over the whole radial extension between the casing and the rotor. In a second preferred embodiment of the blindwall the main body of the blindwall can extend approximately over the whole radial extension between the casing and the rotor, so that the annular chamber is arranged near to the casing of the steam turbine. The crucial factor is that the inner surface of the casing and of the splitplane of both casing parts can be heated up by the introduced steam, so that the temperature gradient over the inner surface of the casing and the splitplane is uniform and the thermal stresses in that part of the steam turbine are reduced. The first and the second annular wall are spaced apart from each other, so that the main body is building the bottom part between both walls to contact the rotor of the steam turbine.
- Advantageously the annular chamber is a circumferential groove in the blindwall with the opening in the direction to the casing of the steam turbine. Steam with an intermediate temperature can be introduced through the third steam inlet into the annular chamber where the steam can heat up the inner surface of the casing and the splitplane in this area. The introduced steam is guided through the annular chamber and exits the annular chamber through the third steam outlet. It is possible that more than one third steam inlet and more than one third steam outlet are provided in the casing of the steam turbine for guiding steam with an intermediate temperature into and out of the annular chamber. The distance between the first annular wall and the second annular wall can be different. That means if the temperature difference between the temperature in the first pressure section and the temperature in the second pressure section is very high the distance between the first annular wall and the second annular wall of the blindwall can made relatively large. If the temperature difference between both pressure sections not very high a blindwall can be used with an annular chamber of a small size. In this case the distance between the first annular wall and the second annular wall of the blindwall can be of a smaller size. According to a preferred development of the invention the casing of the steam turbine can comprise a first annular groove for receiving the first annular wall of the blindwall and a second annular groove for receiving the second annular wall of the blindwall. Preferably the first annular groove is arranged parallel to the second annular groove in the casing of the steam turbine. The distance between both grooves in the casing that means in that part of the casing which is directed to the rotor, is the same like the distance between the first annular wall and the second annular wall of the annular or circumferential grooves. The annular or circumferential grooves are shaped in a way that they can receive the ends of the annular walls form-locking. Advantageously in each groove is at least one sealing element arranged for sealing the annular walls with the casing. The arrangement of sealing elements between the first and the second wall and the casing of the steam turbine and the main body of the blindwall and the rotor of the steam turbine enables a secure sealing between the first pressure section and the second pressure section of the steam turbine.
- In a first preferred embodiment of the steam turbine the third steam inlet for introducing steam with an intermediate temperature can be connected to an external steam source. That means the steam flow from the first pressure section via the bypass to the second pressure section is separated from the steam flow to the annular chamber of the blindwall. This enables a very unique supply of steam with a certain intermediate temperature into the annular chamber. The supply of steam from an external source enables that no fluctuations of the intermediate temperature of the steam can occur. The external steam source comprises a reheater or is connected to a reheater to heat up the steam temperature which is introduced into the annular chamber to the desired temperature.
- Alternatively to the external steam source the third steam inlet of the casing can be connected to the bypass between the steam outlet of the first pressure section and the steam inlet of the second pressure section. In this case steam with an intermediate temperature can be drawn of the bypass and can be introduced into the annular chamber. The connection from the third steam inlet of the casing to the bypass between the steam outlet of the first pressure section and the steam inlet of the second pressure section can be realized by a pipe. The connection is preferably arranged in such a way that the reheater which is arranged at the bypass for reheating the steam can heat up the steam which is guided to the annular chamber to the desired intermediate temperature, whereby the rest of the steam which is guided through the bypass into the second pressure section can be further heated up to a higher temperature. That means the connection of the pipe can be in a middle part of the reheater, so that the steam coming from the steam outlet of the first pressure section is heated up to an intermediate temperature when reaching the connection to the third steam inlet of the casing. The steam which flows through the whole reheater is heated more than the part of the steam which is guided through the pipe into the annular chamber of the blindwall.
- Alternatively to such a steam turbine a different steam turbine can comprise two reheaters which are arranged in series, whereby the connection and the pipe, respectively, for guiding steam into the annular chamber is arranged between both reheaters. This enables that the steam coming from the steam outlet of the first pressure section can be reheated in the first reheater up to an intermediate temperature and can be reheated in the second reheater to a higher temperature.
- In particular the steam turbine is built for introducing steam into the annular chamber, whereby the steam is having a temperature between the temperature of the steam at the steam outlet of the first pressure section and the temperature of the steam at the steam inlet of the second pressure section. For example, hot steam which enters the first pressure section, which is the high pressure side of the steam turbine, with a temperature of 400 degrees Celsius exits the steam outlet of the first pressure section with a temperature of 200 degrees Celsius. The steam is guided through the bypass from the steam outlet of the first pressure section to the steam inlet of the second pressure section, whereby a reheater heats up again the steam to a temperature of 400 degrees Celsius. In an external steam source a different steam can be heated up to an intermediate temperature of for example 300 degrees Celsius. This second steam with the intermediate temperature of 300 degrees Celsius is introduced into the annular chamber for heating up the inner surface of the casing and the splitplane of the casing parts in the area of the blindwall. By this the temperature gradient over the splitplane in the area of the blindwall can be reduced, so that higher temperature gradients can be taken over the blindwall and/or the size of the splitplane bolts which are necessary for the fixation of the two parts of the casing can be reduced. The reduction of the temperature gradient over the splitplane in the area of the blindwall enables a reduction of the thermal stresses in this area of the casing parts. By reducing the splitplane bolts size the costs of the steam turbine can be reduced.
- The present the invention will now be described by way of example with references to the accompanying drawings:
- Fig. 1
- shows schematically a sectional view of a steam turbine which is constructed according to the invention,
- Fig. 2
- shows in a sectional view the first pressure section and the second pressure section, which are separated by a blindwall which is build according to the invention,
- Fig. 3
- shows an increased sectional view of the arrangement of the blindwall between the rotor and the casing of the steam turbine and the steam flow from the first pressure section into the annular chamber and to the second pressure section.
-
Fig. 1 shows schematically a sectional view of asteam turbine 40 comprising arotor 20,several bladings 21 and acasing 22, whereby only one part of thecasing 22 is shown, so that thesplitplane 23 of this part of thecasing 22 can be seen. Further severalsplitplane bolts 24 are shown, which enables the fixation of the two casing parts together at theirsplitplane 23. Thesteam turbine 40 comprises afirst pressure section 30 and asecond pressure section 35. Thepressure sections annular blindwall 1. Theannular blindwall 1 is arranged between therotor 20 and theinner surface 26 of thecasing 22. Bothpressure sections first pressure section 30 and the steam inlet of thesecond pressure section 35 are arranged next to theblindwall 1. Thefirst pressure section 30 is the high pressure side of thesteam turbine 40 and thesecond pressure section 35 can be the intermediate or low pressure side of thesteam turbine 40. In this preferred embodiment of the invention theblindwall 1 and anannular part 25 of theinner surface 26 of thecasing 22 are building anannular chamber 2. In theannular chamber 2 steam with an intermediate temperature can be introduced for heating up theannular part 25 of theinner surface 26. This results in a reduction of the temperature gradient over thesplitplane 23 in the area of theblindwall 1. As a result of that the temperature differences between the temperature in thefirst pressure section 30 and the temperature in thesecond pressure section 35 can be high, in particular more than 200 degrees Celsius. On the other side the reduction of the temperature gradient over thesplitplane 23 in the area of theblindwall 1 allows to usesplitplane bolts 24 of a small size. Therefore the costs of thesteam turbine 40 can be reduced. -
Fig. 2 shows schematically a sectional view of bothpressure sections blindwall 1, which is constructed according to the invention. Bothpressure sections bypass 10. That means, a steam outlet of thefirst pressure section 30 is connected by thebypass 10 with the steam inlet of thesecond pressure section 35. This enables to heat up the steam by areheater 11 which is arranged at thebypass 10 and enables to introduce the reheated steam into thesecond pressure section 35. The additional connection between theannular chamber 2 and thebypass 10 allows introducing parts of the steam flow into theannular chamber 2 of theblindwall 1. The specific arrangement of thereheater 11 at thebypass 10 enables that the steam which is introduced into theannular chamber 2 can be heated up to an intermediate temperature, which lies between the temperature of the steam at the steam outlet of thefirst pressure section 30 and temperature of the reheated steam at the steam inlet at thesecond pressure side 35. -
Fig. 3 shows schematically an increased sectional view of the arrangement of theblindwall 1 between therotor 20 and thecasing 22 of thesteam turbine 40. The arrows show the steam flow which exits thefirst pressure section 30 at thesteam outlet 31 and which is partly introduced into theannular chamber 2 of theblindwall 1 and which is partly introduced into thesecond pressure section 35 through thesteam inlet 36. Thesteam outlet 31 at thefirst pressure section 30 is connected with thesteam inlet 36 at thesecond pressure section 35 by thebypass 10. Thereheater 11 is arranged in such a way to thebypass 10 that the steam which can be introduced into theannular chamber 2 can reach an intermediate temperature, whereby the steam which is introduced through thesteam inlet 36 into thesecond pressure section 35 can be fully heated up. That means the steam which is introduced into theannular chamber 2 reaches an intermediate temperature which lies between, in particular in the middle between, the temperature of the steam in thesteam outlet 31 of thefirst pressure section 30 and the temperature of the steam in thesteam inlet 36 at thesecond pressure section 35. Thecircumferential part 25 of theinner surface 26 of thecasing 22 which is building one border of theannular chamber 2 can be heated up by the introduced steam, so that the temperature gradient over thesplitplane 23 of thecasing 22 can be reduced. This allows higher temperature differences between bothpressure sections inventive blindwall 1 allows to reduce the size of thesplitplane bolts 24, because of the reduced temperature gradient over thesplitplane 23 and the reduced thermal stresses in the parts of thecasing 22. - The
steam turbine 40 is built in such a way that the steam which is introduced into theannular chamber 2 of theblindwall 1 has always an intermediate temperature which lies between the temperature next to theblindwall 1 at thefirst pressure section 30 and the temperature next to theblindwall 1 at thesecond pressure section 35. - The
annular chamber 2 which is built by thefirst wall 5, thesecond wall 6, themain body 7 of theblindwall 1 and theannular part 25 of theinner surface 26 of thecasing 22 can be of different sizes. Theannular chamber 2 has advantageously the shape of a circumferential groove. - Alternatively to the embodiment of the
steam turbine 40 shown inFig. 2 and 3 , thesteam turbine 40 can comprise an external steam source. The external steam source is built to generate hot steam, which can be introduced by a separate pipe and the third steam inlet 3 into theannular chamber 2 of theblindwall 1. In this case there is no connection between theannular chamber 2 and thebypass 10, which guides the steam from thefirst pressure section 30 to thesecond pressure section 35. In this case a second reheater is arranged at the external steam source to heat up the steam, which can be introduced into theannular chamber 2 of theblindwall 1. Thefirst reheater 11 heats up the steam coming from thefirst pressure section 30. Thefirst reheater 11 enables to reheat the steam up to a temperature like the temperature of the steam which is introduced into thefirst pressure section 30. - The steam which is introduced into the
annular chamber 2 by the third steam inlet 3 exits theannular chamber 2 by thethird steam outlet 4, seefig 3 .
Claims (6)
- Steam turbine (40) with a rotor (20), with a blading (21), with a casing (22) comprising two parts, whereby the two casing parts are fixed together at their splitplane (23) with several splitplane bolts (24), the steam turbine (40) having a first pressure section (30) and a second pressure section (35), the pressure sections (30, 35) separated from each other by an annular blindwall (1), each pressure section (30, 35) comprising a steam inlet (36) and a steam outlet (31), whereby the steam outlet (31) of the first pressure section (30) and the steam inlet (36) of the second pressure section (35) are arranged next to the blindwall (1), whereby between the steam outlet (31) of the first pressure section (30) and the steam inlet (36) of the second pressure section (35) a bypass (10) for guiding steam from the first pressure section (30) to the second pressure section (35) is arranged outside the casing (22), whereby an reheater (11) is arranged at the bypass (10) for reheating the steam in the bypass (10), characterised in that the blindwall (1) and an annular part (25) of the inner surface (26) of the casing (22) are building an annular chamber (2), whereby the casing (22) comprises a third steam inlet (3) and a third steam outlet (4) which are connected to the annular chamber (2) for guiding steam into and out of the annular chamber (2).
- Steam turbine (40) according to claim 1, characterised in that the blindwall (1) comprises a first annular wall (5), a second annular wall (6) and an annular main body (7), whereby the main body (7) is arranged at the rotor (20) of the steam turbine (40), wherein the annular chamber (2) is built by the first wall (5), the second wall (6), the main body (7) and the annular part (25) of the inner surface (26) of the casing (22).
- Steam turbine (40) according to claim 2, characterised in that a first annular groove (8) is arranged in the casing (22) for receiving the first annular wall (5) and a second annular groove (9) is arranged in the casing (22) for receiving the second annular wall (6).
- Steam turbine (40) according to any one of the claims 2 to 3, characterised in that between the first (5) and the second wall (6) and the casing (22) and/or between the main body (7) of the blindwall (1) and the rotor (20) sealing means are arranged.
- Steam turbine (40) according to any one of the claims 1 to 4, characterised in that the third steam inlet (3) is connected to an external steam source or to the bypass (10).
- Steam turbine (40) according to any one of the claims 1 to 5, characterised in that the steam turbine (40) is built for introducing steam into the annular chamber (2), the steam having a temperature between the temperature of the steam at the steam outlet (31) at the first pressure side (30) and the temperature of the steam at the steam inlet (36) at the second pressure side (35.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10182377.1A EP2436885B1 (en) | 2010-09-29 | 2010-09-29 | Steam turbine with a blindwall between adjacent pressure sections |
PCT/EP2011/065270 WO2012041642A1 (en) | 2010-09-29 | 2011-09-05 | Steam turbine with a blindwall between adjacent pressure sections |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10182377.1A EP2436885B1 (en) | 2010-09-29 | 2010-09-29 | Steam turbine with a blindwall between adjacent pressure sections |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2436885A1 EP2436885A1 (en) | 2012-04-04 |
EP2436885B1 true EP2436885B1 (en) | 2018-02-21 |
Family
ID=43708932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10182377.1A Not-in-force EP2436885B1 (en) | 2010-09-29 | 2010-09-29 | Steam turbine with a blindwall between adjacent pressure sections |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2436885B1 (en) |
WO (1) | WO2012041642A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE447836A (en) * | 1941-11-13 | |||
US2547300A (en) * | 1949-05-26 | 1951-04-03 | Allis Chalmers Mfg Co | Diaphragm for reheat elastic fluid turbines |
US2920867A (en) * | 1957-01-22 | 1960-01-12 | Westinghouse Electric Corp | Reheat turbine apparatus |
CH670480A5 (en) * | 1986-09-11 | 1989-06-15 | Bbc Brown Boveri & Cie | Steam turbine with heated flanges - avoids damage from differential thermal expansion by using steam to heat flanges of turbine casing via suitable channels |
JP2883341B2 (en) * | 1988-11-22 | 1999-04-19 | 株式会社日立製作所 | Structure of steam turbine, steam generation system for steam turbine, and operation method thereof |
JPH048703U (en) * | 1990-05-10 | 1992-01-27 | ||
US5411365A (en) * | 1993-12-03 | 1995-05-02 | General Electric Company | High pressure/intermediate pressure section divider for an opposed flow steam turbine |
-
2010
- 2010-09-29 EP EP10182377.1A patent/EP2436885B1/en not_active Not-in-force
-
2011
- 2011-09-05 WO PCT/EP2011/065270 patent/WO2012041642A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2012041642A1 (en) | 2012-04-05 |
EP2436885A1 (en) | 2012-04-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20100034641A1 (en) | Steam turbine and steam turbine plant system | |
US7681396B2 (en) | Steam turbine with heating steam extraction and power plant with steam turbine | |
CA2863171C (en) | Method and turbine for expanding an organic operating fluid in a rankine cycle | |
JP2013241934A5 (en) | ||
MX2013007023A (en) | A supercritical heat recovery steam generator reheater and supercritical evaporator arrangement. | |
ITMI20120852A1 (en) | ORC SYSTEM FOR THE PRODUCTION OF ENERGY BY ORGANIC RANKINE CYCLE | |
EP1479873B1 (en) | Steam turbine | |
KR102467399B1 (en) | Steam turbine plant and combined cycle plant | |
JP5038532B2 (en) | Steam power plant | |
US10227873B2 (en) | Steam turbine | |
US11352910B2 (en) | Steam turbine and method for operating same | |
JP2019108835A (en) | Steam turbine plant and its operation method | |
EP2436885B1 (en) | Steam turbine with a blindwall between adjacent pressure sections | |
EP3135871B1 (en) | Back-pressure steam turbine and a system for combined production of electrical and thermal energy | |
CN103953401B (en) | High-and-medium pressure cylinder of steam turbine for thermal power plant | |
US8869532B2 (en) | Steam turbine utilizing IP extraction flow for inner shell cooling | |
KR102101166B1 (en) | Reheating of working fluid inside turbine system for power generation | |
JP6910427B2 (en) | Steam turbine outflow housing | |
EP3262284B1 (en) | Combined cycle power plant having supercritical steam turbine | |
JP6511519B2 (en) | Controlled cooling of a turbine shaft | |
US20170306801A1 (en) | Method for shortening the start-up process of a steam turbine | |
JP7263514B2 (en) | Steam turbine and its operating method | |
JP5551268B2 (en) | Steam turbine with triple structure |
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 |
|
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 SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME RS |
|
17P | Request for examination filed |
Effective date: 20121001 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20171016 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
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 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 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 971948 Country of ref document: AT Kind code of ref document: T Effective date: 20180315 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602010048577 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20180221 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG4D |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 971948 Country of ref document: AT Kind code of ref document: T Effective date: 20180221 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20180221 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: 20180221 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: 20180221 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: 20180221 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: 20180221 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: 20180521 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: 20180221 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20180521 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: 20180221 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: 20180221 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: 20180221 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: 20180522 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL 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: 20180221 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: 20180221 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: 20180221 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: 20180221 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602010048577 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
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: 20180221 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: 20180221 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: 20180221 |
|
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: 20181122 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CZ Payment date: 20180927 Year of fee payment: 9 |
|
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: 20180221 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602010048577 Country of ref document: DE |
|
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: 20180221 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20180929 |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20180930 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
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: 20180929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190402 Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180929 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180930 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180930 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180930 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180929 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR 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: 20180221 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190929 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: 20100929 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: 20180221 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20180221 |
|
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: 20180621 |