EP3929409A1 - Nozzle casing for a steam turbine with four chambers and two control wheels - Google Patents
Nozzle casing for a steam turbine with four chambers and two control wheels Download PDFInfo
- Publication number
- EP3929409A1 EP3929409A1 EP20181856.4A EP20181856A EP3929409A1 EP 3929409 A1 EP3929409 A1 EP 3929409A1 EP 20181856 A EP20181856 A EP 20181856A EP 3929409 A1 EP3929409 A1 EP 3929409A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- steam
- inlet
- steam turbine
- outlet
- 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.)
- Withdrawn
Links
- 238000004891 communication Methods 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 238000005192 partition Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 210000004907 gland Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 230000001419 dependent 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
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
-
- 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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
-
- 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
- F01D9/00—Stators
- F01D9/06—Fluid supply conduits to nozzles 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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
Definitions
- the present invention relates to the field of steam turbines. Particularly, the present invention relates to a nozzle casing for a steam turbine, and to a steam turbine.
- Fig. 9 shows a design of a steam turbine 900 according to the prior art, comprising a nozzle casing 921, 922 inside a turbine casing 911, 912.
- the nozzle casing 921, 922 is formed of an upper nozzle casing 921 and a lower nozzle casing 922.
- the upper nozzle casing 921 forms a first chamber therein (at the right upper side in Fig. 9 ), and the lower nozzle casing 922 forms a second chamber and a third chamber therein (at the left and right lower sides).
- Each chamber has an outlet (nozzle) in a shape of a circular ring segment. Downstream the outlets, a control wheel is arranged which is rotatable to adjust an amount of steam which is allowed to pass the corresponding outlet.
- the upper nozzle casing 921 is surrounded by an upper turbine casing 911 and the lower nozzle casing 922 is surrounded by a lower turbine casing 912.
- a first turbine inlet 913 is connected to the upper turbine casing 911 at an upper right side of the steam turbine 900 in Fig. 9 .
- a second turbine inlet 914 and a third turbine inlet 915 are connected to the lower turbine casing 912 at a lower right side (second turbine inlet 914) and at a lower left side (third turbine inlet 915) of the steam turbine 900 in Fig. 9 .
- control wheel is adjustable in such a way that the amount of steam of the first inlet steam flow 933, the second inlet steam flow 934 and the third inlet steam flow 935 are individually controlled depending on the load case.
- a nozzle casing for a steam turbine wherein the nozzle casing comprises a first section extending at least partly along a circumferential direction of the steam turbine.
- the nozzle casing is configured to be mounted around a turbine shaft of the steam turbine, wherein a lateral surface of the turbine shaft or a rotational direction of the turbine shaft corresponds to the circumferential direction of the steam turbine.
- the first section defines a first chamber and a second chamber, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine.
- the first section further comprises a first inlet configured to introduce a first steam flow from the outside into the first chamber, a second inlet configured to introduce a second steam flow from the outside into the second chamber, a first outlet being in a fluid communication with the first and second chambers, and a second outlet being in a fluid communication with the first and second chambers such that the first steam flow flowing from the first inlet into the first chamber is injectable through the first and second outlets into flow paths of the steam turbine, and the second steam flow flowing from the second inlet into the second chamber is injectable through the first and second outlets into the flow paths of the steam turbine.
- the first and second outlets preferably extend along an arc or ring segment in the circumferential direction and are shaped as a slit or a perforated grid.
- the nozzle casing which enables a higher steam throughput and has a compacter size.
- the first section further comprises a third inlet configured to introduce a third steam flow from the outside into the first chamber and a fourth inlet configured to introduce a fourth steam flow from the outside into the second chamber, such that the third steam flow flowing from the third inlet into the first chamber is injectable through the first and second outlets into the flow paths of the steam turbine, and the fourth steam flow flowing from the fourth inlet into the second chamber is injectable through the first and second outlets into the flow paths of the steam turbine.
- the nozzle casing which enables even a higher and uniform steam throughput.
- the nozzle casing further comprises a second section extending at least partly along the circumferential direction of the steam turbine, wherein the second section defines a third chamber and a fourth chamber, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine.
- the second section further comprises a fifth inlet configured to introduce a fifth steam flow from the outside into the third chamber, a sixth inlet configured to introduce a sixth steam flow from the outside into the fourth chamber, a third outlet being in a fluid communication with the third and fourth chambers, and a fourth outlet being in a fluid communication with the third and fourth chambers, such that the fifth steam flow flowing from the fifth inlet into the third chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine, and the sixth steam flow flowing from the sixth inlet into the fourth chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine.
- the nozzle casing is easy to manufacture and provides a higher and uniform steam throughput.
- the nozzle casing comprises at least one of the following: extensions of the first chamber and the second chamber have an overlap in an axial direction of the steam turbine, and extensions of the third chamber and the fourth chamber have an overlap in an axial direction of the steam turbine.
- the axial direction can be defined by an axis of the turbine shaft.
- the nozzle casing is very compact.
- the first and second sections are similarly or identically shaped, and the first and second sections are particularly cast parts.
- the first and second sections can be manufactured in a large lot size under low costs.
- the second section further comprises a seventh inlet configured to introduce a seventh steam flow from the outside into the third chamber and an eighth inlet con-figured to introduce an eighth steam flow from the outside into the fourth chamber, such that the seventh steam flow flowing from the seventh inlet into the third chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine, and the eighth steam flow flowing from the eighth inlet into the fourth chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine.
- the nozzle casing is equipped with eight steam inlets.
- the nozzle casing further comprises a first control wheel arranged downstream of the first outlet and a second control wheel arranged downstream of the second outlet, the first control wheel being configured to adjust a steam flow from the first outlet and the second control wheel being configured to adjust a steam flow from the second outlet.
- the first control wheel is further configured to adjust a steam flow from the third outlet and the second control wheel is further configured to adjust a steam flow from the fourth outlet.
- a steam turbine comprises the above-mentioned nozzle casing, wherein a steam flow from the first outlet merges a steam flown from the third outlet in a first axial direction of the steam turbine, and a steam flow from the second outlet merges a steam flown from the fourth outlet in second first axial direction of the steam turbine, wherein the second first axial direction of the steam turbine is opposite to the first axial direction of the steam turbine.
- a steam turbine has a high throughput and a compact size.
- the steam turbine further comprises at least one of the following: a first piping having a first branch connected to the first inlet and a second branch connected to the second inlet, wherein the first piping is particularly an elbow piping; and a second piping having a first branch connected to the third inlet and a second branch connected to the fourth inlet, wherein the second piping is particularly an elbow piping.
- the pipings are easy to manufacture, robust and compact.
- first and second control wheels are supported by the first and second sections and by a turbine casing.
- a sealing can be arranged between the control wheel and the nozzle casing body.
- Fig. 1 shows a bottom view of a steam turbine 1000 according to an embodiment
- Fig. 2 shows a longitudinal section C-C of the steam turbine 1000 of Fig. 1
- Fig. 3 shows a cross section B-B of the steam turbine 1000 of Fig. 1 .
- a turbine shaft 100 is rotatably supported in a turbine casing 103 by means of a radial and axial bearing 101, which is arranged in a bearing pedestal 102, and another radial bearing (not shown). Between the turbine shaft 100 and the turbine casing 103, a nozzle casing 1 is arranged, through which steam flows are injected to stator and rotor bladings 108, 109 which are supported at the turbine shaft 100 via guide blade carriers 105, 106. After having passed the stator and rotor bladings 108, 109, the steam flow is discharged from the turbine case 103 at the right-hand side of Fig. 2 and through a bleed passage 104 at the left-hand side of Fig. 2 .
- Reference sign 107 designates a balance piston gland.
- the nozzle casing 1 comprises a first section 2 extending at least partly along a circumferential direction of the steam turbine 1000.
- the nozzle casing 1 is configured to be mounted around the turbine shaft 100 of the steam turbine 1000, wherein a lateral surface of the turbine shaft 100 or a direction of rotation of the turbine shaft 100 around a rotational axis X corresponds to the circumferential direction of the steam turbine 1000.
- the first section 2 defines a first chamber 3 and a second chamber 4, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine 1000.
- the first section 2 further comprises a first inlet 5 configured to introduce a first steam flow from the outside into the first chamber 3, a second inlet 6 configured to introduce a second steam flow from the outside into the second chamber 4, a first outlet 7 being in a fluid communication with the first and second chambers 3, 4, and a second outlet 8 being in a fluid communication with the first and second chambers 3, 4.
- each outlet 7, 8 extends along a circular ring segment or arc segment in the circumferential direction and is shaped as a slit or a perforated grid.
- the first inlet 5, the second inlet 6, the first outlet 7 and the second outlet 8 are configured such that the first steam flow flowing from the first inlet 5 into the first chamber 3 is injectable through the first and second outlets 7, 8 into flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109, and the second steam flow flowing from the second inlet 6 into the second chamber 4 is injectable through the first and second outlets 7, 8 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109.
- Fig. 4 shows a bottom view of a nozzle casing 1
- Fig. 5 shows a cross section E-E of the nozzle casing 1 of Fig. 4
- Fig. 6 shows a longitudinal section of the nozzle casing according to the embodiment
- Fig. 7 shows a cross section E1-E1 of the nozzle casing according to the embodiment
- Fig. 8 shows a cross section E2-E2 of the nozzle casing according to the embodiment.
- the first section 2 further comprises a third inlet 9 configured to introduce a third steam flow from the outside into the first chamber 3 and a fourth inlet 10 configured to introduce a fourth steam flow from the outside into the second chamber 4.
- the third inlet 9 and the fourth inlet 10 are configured such that the third steam flow flowing from the third inlet 9 into the first chamber 3 is injectable through the first and second outlets 7, 8 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109, and the fourth steam flow flowing from the fourth inlet 10 into the second chamber 4 is injectable through the first and second outlets 7, 8 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109.
- reference sign P designates a horizontal split plane, wherein the first section 2 is arranged directly above the horizontal split plane P.
- the nozzle casing 1 further comprises a second section 20 extending at least partly along the circumferential direction of the steam turbine 1000, i.e. directly below the horizontal split plane P.
- the nozzle casing 1 is divided at the horizontal split plane P in the upper first section 2 and the lower second section 20.
- the first section 2 and the lower section 20 can be connected to each other by bolts, or they can also be welded at the horizontal split plane P.
- the second section 20 defines a third chamber 30 and a fourth chamber 40, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine 1000.
- the second section 20 further comprises a fifth inlet 50 configured to introduce a fifth steam flow from the outside into the third chamber 30, a sixth inlet 60 configured to introduce a sixth steam flow from the outside into the fourth chamber 40, a third outlet 70 being in a fluid communication with the third and fourth chambers 30, 40, and a fourth outlet 80 being in a fluid communication with the third and fourth chambers 30, 40.
- each outlet 70, 80 extends along a circular ring or arc segment of the circumferential direction and is shaped as a slit or a perforated grid.
- the fifth inlet 50, the sixth inlet 60, the third outlet 70, and the fourth outlet 80 are configured such that the fifth steam flow flowing from the fifth inlet 50 into the third chamber 30 is injectable through the third and fourth outlets 70, 80 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109, and the sixth steam flow flowing from the sixth inlet 60 into the fourth chamber 40 is injectable through the third and fourth outlets 70, 80 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109.
- the first section 2 comprises a partition wall 17, by which the firsts chamber 3 is separated from the second chamber 4. Extensions of the first chamber 3 and the second chamber 4 have an overlap in an axial direction of the steam turbine 1000, wherein the axial direction is similar to the rotational axis X of the turbine shaft 100.
- the second section 20 comprises a partition wall 170, by which the first chamber 330 is separated from the second chamber 40. Extensions of the third chamber 30 and the fourth chamber 40 have an overlap in an axial direction of the steam turbine 1000.
- the first and second sections 2, 20 are similarly or identically shaped, and the first and second sections 2, 20 are particularly cast parts so that the first and second sections 2, 20 can be manufactured in a large lot size under low costs.
- the second section 20 further comprises a seventh inlet 90 configured to introduce a seventh steam flow from the outside into the third chamber 30 and an eighth inlet 110 configured to introduce an eighth steam flow from the outside into the fourth chamber 40.
- the seventh inlet 90 and the eighth inlet 110 are configured such that the seventh steam flow flowing from the seventh inlet 90 into the third chamber 30 is injectable through the third and fourth outlets 70, 80 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109, and the eighth steam flow flowing from the eighth inlet 110 into the fourth chamber 40 is injectable through the third and fourth outlets 70, 80 into the flow paths of the steam turbine 1000 towards the stator and rotor bladings 108, 109.
- Sealing rings are placed at every steam inlet 5, 6, 9, 10, 50, 60, 90, 110.
- the sealing rings can be placed between the first section 2 and the turbine casing 103 and between the second section 20 and the turbine casing 103 (cf. Fig. 3 ).
- a first control wheel 11 is arranged downstream of the first outlet 7, and a second control wheel 12 is arranged downstream of the second outlet 8.
- the first control wheel 11 is configured to adjust a steam flow from the first outlet 7, and the second control wheel 12 is configured to adjust a steam flow from the second outlet 8.
- the first control wheel 11 is further configured to adjust a steam flow from the third outlet 70, and the second control wheel 12 is further configured to adjust a steam flow from the fourth outlet 80.
- a steam flow from the first outlet 7 merges a steam flown from the third outlet 70 in a first axial direction of the steam turbine 1000 (to the right in Fig. 2 ), and a steam flow from the second outlet 8 merges a steam flown from the fourth outlet 80 in second first axial direction of the steam turbine 1000 (to the left in Fig. 2 ), wherein the second first axial direction of the steam turbine 1000 is opposite to the first axial direction of the steam turbine 1000.
- the steam turbine 1000 further comprises at the first section 2 a first piping 13 having a first branch 14 connected to the first inlet 5 and a second branch 15 connected to the second inlet 6, wherein the first piping 13 is embodied as an elbow piping.
- first piping 13 is embodied as an elbow piping.
- second piping 16 is provided, which has a first branch connected to the third inlet 9 and a second branch (not shown) connected to the fourth inlet 10, wherein the second piping 16 is also embodied as an elbow piping.
- the steam turbine 1000 further comprises at the second section 20 a first piping 130 having a first branch 140 connected to the first inlet 50 and a second branch 150 connected to the second inlet 60, wherein the first piping 130 is also embodied as an elbow piping.
- second piping 160 is provided, which has a first branch connected to the third inlet 9 and a second branch connected to the fourth inlet 10, wherein the second piping 160 is also embodied as an elbow piping.
- the first and second pipings 13, 16, 130, 160 are similarly or identically shaped.
- the first and second control wheels 11, 12 are supported by the first and second sections 2, 20 and by the turbine casing 103, wherein a sealing can be arranged between the first and second control wheels 11, 12 and the first and second sections 2, 20.
Abstract
Description
- The present invention relates to the field of steam turbines. Particularly, the present invention relates to a nozzle casing for a steam turbine, and to a steam turbine.
-
Fig. 9 shows a design of asteam turbine 900 according to the prior art, comprising anozzle casing turbine casing Fig. 9 thenozzle casing upper nozzle casing 921 and alower nozzle casing 922. Theupper nozzle casing 921 forms a first chamber therein (at the right upper side inFig. 9 ), and thelower nozzle casing 922 forms a second chamber and a third chamber therein (at the left and right lower sides). Each chamber has an outlet (nozzle) in a shape of a circular ring segment. Downstream the outlets, a control wheel is arranged which is rotatable to adjust an amount of steam which is allowed to pass the corresponding outlet. - The
upper nozzle casing 921 is surrounded by anupper turbine casing 911 and thelower nozzle casing 922 is surrounded by alower turbine casing 912. Afirst turbine inlet 913 is connected to theupper turbine casing 911 at an upper right side of thesteam turbine 900 inFig. 9 . Additionally, asecond turbine inlet 914 and athird turbine inlet 915 are connected to thelower turbine casing 912 at a lower right side (second turbine inlet 914) and at a lower left side (third turbine inlet 915) of thesteam turbine 900 inFig. 9 . - In the conventional solution, the control wheel is adjustable in such a way that the amount of steam of the first
inlet steam flow 933, the secondinlet steam flow 934 and the thirdinlet steam flow 935 are individually controlled depending on the load case. - There may be a need for a nozzle casing which enables a higher steam throughput and has a compacter size. This need may be met by the subject matters according to the independent claims. The present invention is further developed as set forth in the dependent claims.
- According to a first aspect of the invention, a nozzle casing for a steam turbine, wherein the nozzle casing comprises a first section extending at least partly along a circumferential direction of the steam turbine. The nozzle casing is configured to be mounted around a turbine shaft of the steam turbine, wherein a lateral surface of the turbine shaft or a rotational direction of the turbine shaft corresponds to the circumferential direction of the steam turbine. The first section defines a first chamber and a second chamber, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine. The first section further comprises a first inlet configured to introduce a first steam flow from the outside into the first chamber, a second inlet configured to introduce a second steam flow from the outside into the second chamber, a first outlet being in a fluid communication with the first and second chambers, and a second outlet being in a fluid communication with the first and second chambers such that the first steam flow flowing from the first inlet into the first chamber is injectable through the first and second outlets into flow paths of the steam turbine, and the second steam flow flowing from the second inlet into the second chamber is injectable through the first and second outlets into the flow paths of the steam turbine. The first and second outlets preferably extend along an arc or ring segment in the circumferential direction and are shaped as a slit or a perforated grid. Advantageously, the nozzle casing which enables a higher steam throughput and has a compacter size.
- In an embodiment, the first section further comprises a third inlet configured to introduce a third steam flow from the outside into the first chamber and a fourth inlet configured to introduce a fourth steam flow from the outside into the second chamber, such that the third steam flow flowing from the third inlet into the first chamber is injectable through the first and second outlets into the flow paths of the steam turbine, and the fourth steam flow flowing from the fourth inlet into the second chamber is injectable through the first and second outlets into the flow paths of the steam turbine. Advantageously, the nozzle casing which enables even a higher and uniform steam throughput.
- In an embodiment, the nozzle casing further comprises a second section extending at least partly along the circumferential direction of the steam turbine, wherein the second section defines a third chamber and a fourth chamber, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine. The second section further comprises a fifth inlet configured to introduce a fifth steam flow from the outside into the third chamber, a sixth inlet configured to introduce a sixth steam flow from the outside into the fourth chamber, a third outlet being in a fluid communication with the third and fourth chambers, and a fourth outlet being in a fluid communication with the third and fourth chambers, such that the fifth steam flow flowing from the fifth inlet into the third chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine, and the sixth steam flow flowing from the sixth inlet into the fourth chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine. Advantageously, the nozzle casing is easy to manufacture and provides a higher and uniform steam throughput.
- In an embodiment, the nozzle casing comprises at least one of the following: extensions of the first chamber and the second chamber have an overlap in an axial direction of the steam turbine, and extensions of the third chamber and the fourth chamber have an overlap in an axial direction of the steam turbine. The axial direction can be defined by an axis of the turbine shaft. Advantageously, the nozzle casing is very compact.
- In an embodiment, the first and second sections are similarly or identically shaped, and the first and second sections are particularly cast parts. Thus, the first and second sections can be manufactured in a large lot size under low costs.
- In an embodiment, the second section further comprises a seventh inlet configured to introduce a seventh steam flow from the outside into the third chamber and an eighth inlet con-figured to introduce an eighth steam flow from the outside into the fourth chamber, such that the seventh steam flow flowing from the seventh inlet into the third chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine, and the eighth steam flow flowing from the eighth inlet into the fourth chamber is injectable through the third and fourth outlets into the flow paths of the steam turbine. As a result, the nozzle casing is equipped with eight steam inlets.
- In an embodiment, the nozzle casing further comprises a first control wheel arranged downstream of the first outlet and a second control wheel arranged downstream of the second outlet, the first control wheel being configured to adjust a steam flow from the first outlet and the second control wheel being configured to adjust a steam flow from the second outlet.
- In an embodiment, the first control wheel is further configured to adjust a steam flow from the third outlet and the second control wheel is further configured to adjust a steam flow from the fourth outlet.
- According to a second aspect of the invention, a steam turbine comprises the above-mentioned nozzle casing, wherein a steam flow from the first outlet merges a steam flown from the third outlet in a first axial direction of the steam turbine, and a steam flow from the second outlet merges a steam flown from the fourth outlet in second first axial direction of the steam turbine, wherein the second first axial direction of the steam turbine is opposite to the first axial direction of the steam turbine. Such a steam turbine has a high throughput and a compact size.
- In an embodiment, the steam turbine further comprises at least one of the following: a first piping having a first branch connected to the first inlet and a second branch connected to the second inlet, wherein the first piping is particularly an elbow piping; and a second piping having a first branch connected to the third inlet and a second branch connected to the fourth inlet, wherein the second piping is particularly an elbow piping. The pipings are easy to manufacture, robust and compact.
- In an embodiment, the first and second control wheels are supported by the first and second sections and by a turbine casing. A sealing can be arranged between the control wheel and the nozzle casing body.
- It has to be noted that embodiments of the invention have been described with reference to different subject matters.
- In particular, some embodiments have been described with reference to apparatus type claims whereas other embodiments have been described with reference to method type claims. However, a person skilled in the art will gather from the above and the following description that, unless other notified, in addition to any combination of features belonging to one type of subject matter also any combination between features relating to different subject matters, in particular between features of the apparatus type claims and features of the method type claims is considered as to be disclosed with this application.
- The aspects defined above and further aspects of the present invention are apparent from the examples of embodiment to be described hereinafter and are explained with reference to the examples of embodiment. The invention will be described in more detail hereinafter with reference to examples of embodiment but to which the invention is not limited.
- Fig. 1
- shows a bottom view of a steam turbine according to an embodiment;
- Fig. 2
- shows a longitudinal section C-C of the steam turbine of
Fig. 1 ; - Fig. 3
- shows a cross section B-B of the steam turbine of
Fig. 1 ; - Fig. 4
- shows a bottom view of a nozzle casing;
- Fig. 5
- shows a cross section E-E of the nozzle casing of
Fig. 4 ; - Fig. 6
- shows a longitudinal section of the nozzle casing according to the embodiment;
- Fig. 7
- shows a cross section E1-E1 of the nozzle casing according to the embodiment;
- Fig. 8
- shows a cross section E2-E2 of the nozzle casing according to the embodiment;
- Fig. 9
- shows a design of a steam turbine according to the prior art.
- The illustrations in the drawings are schematically. It is noted that in different figures, similar or identical elements are provided with the same reference signs.
-
Fig. 1 shows a bottom view of asteam turbine 1000 according to an embodiment,Fig. 2 shows a longitudinal section C-C of thesteam turbine 1000 ofFig. 1 , andFig. 3 shows a cross section B-B of thesteam turbine 1000 ofFig. 1 . - A
turbine shaft 100 is rotatably supported in aturbine casing 103 by means of a radial andaxial bearing 101, which is arranged in abearing pedestal 102, and another radial bearing (not shown). Between theturbine shaft 100 and theturbine casing 103, anozzle casing 1 is arranged, through which steam flows are injected to stator and rotor bladings 108, 109 which are supported at theturbine shaft 100 viaguide blade carriers 105, 106. After having passed the stator and rotor bladings 108, 109, the steam flow is discharged from theturbine case 103 at the right-hand side ofFig. 2 and through ableed passage 104 at the left-hand side ofFig. 2 .Reference sign 107 designates a balance piston gland. - As particularly shown in
Figures 2 and3 , thenozzle casing 1 comprises afirst section 2 extending at least partly along a circumferential direction of thesteam turbine 1000. Thenozzle casing 1 is configured to be mounted around theturbine shaft 100 of thesteam turbine 1000, wherein a lateral surface of theturbine shaft 100 or a direction of rotation of theturbine shaft 100 around a rotational axis X corresponds to the circumferential direction of thesteam turbine 1000. Thefirst section 2 defines afirst chamber 3 and asecond chamber 4, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of thesteam turbine 1000. - The
first section 2 further comprises afirst inlet 5 configured to introduce a first steam flow from the outside into thefirst chamber 3, asecond inlet 6 configured to introduce a second steam flow from the outside into thesecond chamber 4, afirst outlet 7 being in a fluid communication with the first andsecond chambers second outlet 8 being in a fluid communication with the first andsecond chambers outlet first inlet 5, thesecond inlet 6, thefirst outlet 7 and thesecond outlet 8 are configured such that the first steam flow flowing from thefirst inlet 5 into thefirst chamber 3 is injectable through the first andsecond outlets steam turbine 1000 towards the stator and rotor bladings 108, 109, and the second steam flow flowing from thesecond inlet 6 into thesecond chamber 4 is injectable through the first andsecond outlets steam turbine 1000 towards the stator and rotor bladings 108, 109. -
Fig. 4 shows a bottom view of anozzle casing 1,Fig. 5 shows a cross section E-E of thenozzle casing 1 ofFig. 4 ,Fig. 6 shows a longitudinal section of the nozzle casing according to the embodiment,Fig. 7 shows a cross section E1-E1 of the nozzle casing according to the embodiment, andFig. 8 shows a cross section E2-E2 of the nozzle casing according to the embodiment. Thefirst section 2 further comprises athird inlet 9 configured to introduce a third steam flow from the outside into thefirst chamber 3 and afourth inlet 10 configured to introduce a fourth steam flow from the outside into thesecond chamber 4. Thethird inlet 9 and thefourth inlet 10 are configured such that the third steam flow flowing from thethird inlet 9 into thefirst chamber 3 is injectable through the first andsecond outlets steam turbine 1000 towards the stator and rotor bladings 108, 109, and the fourth steam flow flowing from thefourth inlet 10 into thesecond chamber 4 is injectable through the first andsecond outlets steam turbine 1000 towards the stator and rotor bladings 108, 109. - In
Fig. 3 , reference sign P designates a horizontal split plane, wherein thefirst section 2 is arranged directly above the horizontal split plane P. Thenozzle casing 1 further comprises asecond section 20 extending at least partly along the circumferential direction of thesteam turbine 1000, i.e. directly below the horizontal split plane P. In other words, thenozzle casing 1 is divided at the horizontal split plane P in the upperfirst section 2 and the lowersecond section 20. Thefirst section 2 and thelower section 20 can be connected to each other by bolts, or they can also be welded at the horizontal split plane P. - The
second section 20 defines athird chamber 30 and afourth chamber 40, which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of thesteam turbine 1000. Thesecond section 20 further comprises afifth inlet 50 configured to introduce a fifth steam flow from the outside into thethird chamber 30, asixth inlet 60 configured to introduce a sixth steam flow from the outside into thefourth chamber 40, athird outlet 70 being in a fluid communication with the third andfourth chambers fourth outlet 80 being in a fluid communication with the third andfourth chambers outlet fifth inlet 50, thesixth inlet 60, thethird outlet 70, and thefourth outlet 80 are configured such that the fifth steam flow flowing from thefifth inlet 50 into thethird chamber 30 is injectable through the third andfourth outlets steam turbine 1000 towards the stator and rotor bladings 108, 109, and the sixth steam flow flowing from thesixth inlet 60 into thefourth chamber 40 is injectable through the third andfourth outlets steam turbine 1000 towards the stator and rotor bladings 108, 109. - As shown in
Fig. 3 , thefirst section 2 comprises apartition wall 17, by which thefirsts chamber 3 is separated from thesecond chamber 4. Extensions of thefirst chamber 3 and thesecond chamber 4 have an overlap in an axial direction of thesteam turbine 1000, wherein the axial direction is similar to the rotational axis X of theturbine shaft 100. In the same manner, thesecond section 20 comprises apartition wall 170, by which the first chamber 330 is separated from thesecond chamber 40. Extensions of thethird chamber 30 and thefourth chamber 40 have an overlap in an axial direction of thesteam turbine 1000. - The first and
second sections second sections second sections - As shown in
Figures 6 to 8 , thesecond section 20 further comprises aseventh inlet 90 configured to introduce a seventh steam flow from the outside into thethird chamber 30 and aneighth inlet 110 configured to introduce an eighth steam flow from the outside into thefourth chamber 40. Theseventh inlet 90 and theeighth inlet 110 are configured such that the seventh steam flow flowing from theseventh inlet 90 into thethird chamber 30 is injectable through the third andfourth outlets steam turbine 1000 towards the stator and rotor bladings 108, 109, and the eighth steam flow flowing from theeighth inlet 110 into thefourth chamber 40 is injectable through the third andfourth outlets steam turbine 1000 towards the stator and rotor bladings 108, 109. - Sealing rings (not shown) are placed at every
steam inlet first section 2 and theturbine casing 103 and between thesecond section 20 and the turbine casing 103 (cf.Fig. 3 ). - As shown in
Fig. 2 , a first control wheel 11 is arranged downstream of thefirst outlet 7, and a second control wheel 12 is arranged downstream of thesecond outlet 8. The first control wheel 11 is configured to adjust a steam flow from thefirst outlet 7, and the second control wheel 12 is configured to adjust a steam flow from thesecond outlet 8. The first control wheel 11 is further configured to adjust a steam flow from thethird outlet 70, and the second control wheel 12 is further configured to adjust a steam flow from thefourth outlet 80. - As can be taken from
Fig. 2 , a steam flow from thefirst outlet 7 merges a steam flown from thethird outlet 70 in a first axial direction of the steam turbine 1000 (to the right inFig. 2 ), and a steam flow from thesecond outlet 8 merges a steam flown from thefourth outlet 80 in second first axial direction of the steam turbine 1000 (to the left inFig. 2 ), wherein the second first axial direction of thesteam turbine 1000 is opposite to the first axial direction of thesteam turbine 1000. - As shown in
Figures 2 and3 , thesteam turbine 1000 further comprises at the first section 2 afirst piping 13 having afirst branch 14 connected to thefirst inlet 5 and asecond branch 15 connected to thesecond inlet 6, wherein thefirst piping 13 is embodied as an elbow piping. At thefirst section 2,second piping 16 is provided, which has a first branch connected to thethird inlet 9 and a second branch (not shown) connected to thefourth inlet 10, wherein thesecond piping 16 is also embodied as an elbow piping. - The
steam turbine 1000 further comprises at the second section 20 afirst piping 130 having afirst branch 140 connected to thefirst inlet 50 and asecond branch 150 connected to thesecond inlet 60, wherein thefirst piping 130 is also embodied as an elbow piping. At thesecond section 20,second piping 160 is provided, which has a first branch connected to thethird inlet 9 and a second branch connected to thefourth inlet 10, wherein thesecond piping 160 is also embodied as an elbow piping. Preferably, the first andsecond pipings - As shown in
Fig. 2 , the first and second control wheels 11, 12 are supported by the first andsecond sections turbine casing 103, wherein a sealing can be arranged between the first and second control wheels 11, 12 and the first andsecond sections - It should be noted that the term "comprising" does not exclude other elements or steps and "a" or "an" does not exclude a plurality. Also, elements described in association with different embodiments may be combined. It should also be noted that reference signs in the claims should not be construed as limiting the scope of the claims.
-
- 1
- nozzle casing
- 2
- first section
- 3
- first chamber
- 4
- second chamber
- 5
- first inlet
- 6
- second inlet
- 7
- first outlet
- 8
- second outlet
- 9
- third inlet
- 10
- fourth inlet
- 11
- first control wheel
- 12
- second control wheel
- 13
- first piping
- 14
- first branch
- 15
- second branch
- 16
- second piping
- 17
- partition wall
- 20
- second section
- 30
- first chamber
- 40
- second chamber
- 50
- first inlet
- 60
- second inlet
- 70
- first outlet
- 80
- second outlet
- 90
- third inlet
- 100
- turbine shaft
- 101
- radial and axial bearing
- 102
- bearing pedestal
- 103
- turbine casing
- 104
- bleed passage
- 105
- guide blade carrier
- 106
- guide blade carrier
- 107
- balance piston gland
- 108
- stator and rotor blading
- 109
- stator and rotor blading
- 110
- eighth inlet
- 130
- first piping
- 140
- first branch
- 150
- second branch
- 170
- partition wall
- 1000
- steam turbine
- X
- rotational axis
- P
- horizontal split plane
Claims (11)
- A nozzle casing (1) for a steam turbine (1000), comprising:
a first section (2) extending at least partly along a circumferential direction of the steam turbine (1000), wherein the first section (2) defines a first chamber (3) and a second chamber (4), which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine (1000), wherein the first section (2) further comprises:
a first inlet (5) configured to introduce a first steam flow from the outside into the first chamber (3), a second inlet (6) configured to introduce a second steam flow from the outside into the second chamber (4), a first outlet (7) being in a fluid communication with the first and second chambers (3, 4), and a second outlet (8) being in a fluid communication with the first and second chambers (3, 4), such that:the first steam flow flowing from the first inlet (5) into the first chamber (3) is injectable through the first and second outlets (7, 8) into flow paths of the steam turbine (1000), andthe second steam flow flowing from the second inlet (6) into the second chamber (4) is injectable through the first and second outlets (7, 8) into the flow paths of the steam turbine (1000). - The nozzle casing (1) according to the preceding claim,
wherein the first section (2) further comprises a third inlet (9) configured to introduce a third steam flow from the outside into the first chamber (3) and a fourth inlet (10) configured to introduce a fourth steam flow from the outside into the second chamber (4), such that:the third steam flow flowing from the third inlet (9) into the first chamber (3) is injectable through the first and second outlets (7, 8) into the flow paths of the steam turbine (1000), andthe fourth steam flow flowing from the fourth inlet (10) into the second chamber (4) is injectable through the first and second outlets (7, 8) into the flow paths of the steam turbine (1000). - The nozzle casing (1) according to any one of the preceding claims, further comprising:
a second section (20) extending at least partly along the circumferential direction of the steam turbine (1000), wherein the second section (20) defines a third chamber (30) and a fourth chamber (40), which are not in a fluid-communication with each other and extend along different sections along the circumferential direction of the steam turbine (1000), wherein the second section (20) further comprises:
a fifth inlet (50) configured to introduce a fifth steam flow from the outside into the third chamber (30), a sixth inlet (60) configured to introduce a sixth steam flow from the outside into the fourth chamber (40), a third outlet (70) being in a fluid communication with the third and fourth chambers (30, 40), and a fourth outlet (80) being in a fluid communication with the third and fourth chambers (30, 40), such that:the fifth steam flow flowing from the fifth inlet (50) into the third chamber (30) is injectable through the third and fourth outlets (70, 80) into the flow paths of the steam turbine (1000), andthe sixth steam flow flowing from the sixth inlet (60) into the fourth chamber (40) is injectable through the third and fourth outlets (70, 80) into the flow paths of the steam turbine (1000). - The nozzle casing (1) according to any one of the preceding claims, comprising at least one of the following:extensions of the first chamber (3) and the second chamber (4) have an overlap in an axial direction of the steam turbine (1000), andextensions of the third chamber (30) and the fourth chamber (40) have an overlap in an axial direction of the steam turbine (1000).
- The nozzle casing (1) according to any one of the preceding claims 3 and 4, wherein
the first and second sections (2, 20) are similarly or identically shaped, and the first and second sections (2, 20) are particularly cast parts. - The nozzle casing (1) according to any one of the preceding claims 3 to 5, wherein
the second section (20) further comprises a seventh inlet (90) configured to introduce a seventh steam flow from the outside into the third chamber (30) and an eighth inlet (110) configured to introduce an eighth steam flow from the outside into the fourth chamber (40), such that:the seventh steam flow flowing from the seventh inlet (90) into the third chamber (30) is injectable through the third and fourth outlets (70, 80) into the flow paths of the steam turbine (1000), andthe eighth steam flow flowing from the eighth inlet (110) into the fourth chamber (40) is injectable through the third and fourth outlets (70, 80) into the flow paths of the steam turbine (1000). - The nozzle casing (1) according to any one of the preceding claims, further comprising:
a first control wheel (11) arranged downstream of the first outlet (7) and a second control wheel (12) arranged downstream of the second outlet (8), the first control wheel (11) being configured to adjust a steam flow from the first outlet (7) and the second control wheel (12) being configured to adjust a steam flow from the second outlet (8). - The nozzle casing (1) according to the preceding claim, wherein
the first control wheel (11) is further configured to adjust a steam flow from the third outlet (70) and the second control wheel (12) is further configured to adjust a steam flow from the fourth outlet (80). - A steam turbine (1000) comprising the nozzle casing (1) according to any one of the preceding claims, wherein
a steam flow from the first outlet (7) merges a steam flown from the third outlet (70) in a first axial direction of the steam turbine (1000), and a steam flow from the second outlet (8) merges a steam flown from the fourth outlet (80) in second first axial direction of the steam turbine (1000), the second first axial direction of the steam turbine (1000) being opposite to the first axial direction of the steam turbine (1000). - The steam turbine (1000) according to the preceding claim, further comprising at least one of the following:a first piping (13) having a first branch (14) connected to the first inlet (5) and a second branch (15) connected to the second inlet (6), wherein the first piping (13) is particularly an elbow piping; anda second piping (16) having a first branch connected to the third inlet (9) and a second branch connected to the fourth inlet (10), wherein the second piping (16) is particularly an elbow piping.
- The steam turbine (1000) according to any one of the preceding claims 9 and 10 comprising the nozzle casing (1) according to claim 3 and one of claims 7 or 8, wherein
the first and second control wheels (11, 12) are supported by the first and second sections (2, 20) and by a turbine casing.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20181856.4A EP3929409A1 (en) | 2020-06-24 | 2020-06-24 | Nozzle casing for a steam turbine with four chambers and two control wheels |
PCT/EP2021/063663 WO2021259571A1 (en) | 2020-06-24 | 2021-05-21 | Nozzle casing for a steam turbine with four chambers and two control wheels |
BR112022025362A BR112022025362A2 (en) | 2020-06-24 | 2021-05-21 | NOZZLE HOUSING FOR A FOUR CHAMBER STEAM TURBINE AND TWO CONTROL WHEELS |
CN202180044616.7A CN115867718A (en) | 2020-06-24 | 2021-05-21 | Nozzle housing for a steam turbine with four chambers and two control wheels |
EP21731689.2A EP4150195A1 (en) | 2020-06-24 | 2021-05-21 | Nozzle casing for a steam turbine with four chambers and two control wheels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20181856.4A EP3929409A1 (en) | 2020-06-24 | 2020-06-24 | Nozzle casing for a steam turbine with four chambers and two control wheels |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3929409A1 true EP3929409A1 (en) | 2021-12-29 |
Family
ID=71138661
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20181856.4A Withdrawn EP3929409A1 (en) | 2020-06-24 | 2020-06-24 | Nozzle casing for a steam turbine with four chambers and two control wheels |
EP21731689.2A Pending EP4150195A1 (en) | 2020-06-24 | 2021-05-21 | Nozzle casing for a steam turbine with four chambers and two control wheels |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21731689.2A Pending EP4150195A1 (en) | 2020-06-24 | 2021-05-21 | Nozzle casing for a steam turbine with four chambers and two control wheels |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP3929409A1 (en) |
CN (1) | CN115867718A (en) |
BR (1) | BR112022025362A2 (en) |
WO (1) | WO2021259571A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1813777A1 (en) * | 2006-01-31 | 2007-08-01 | Siemens Aktiengesellschaft | Nozzle box fixation |
EP2236764A2 (en) * | 2009-03-13 | 2010-10-06 | Kabushiki Kaisha Toshiba | Nozzle box of axial flow turbine and axial flow turbine |
EP3409895A1 (en) * | 2017-05-29 | 2018-12-05 | Siemens Aktiengesellschaft | Nozzle casing component for a steam turbine |
-
2020
- 2020-06-24 EP EP20181856.4A patent/EP3929409A1/en not_active Withdrawn
-
2021
- 2021-05-21 EP EP21731689.2A patent/EP4150195A1/en active Pending
- 2021-05-21 CN CN202180044616.7A patent/CN115867718A/en active Pending
- 2021-05-21 WO PCT/EP2021/063663 patent/WO2021259571A1/en unknown
- 2021-05-21 BR BR112022025362A patent/BR112022025362A2/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1813777A1 (en) * | 2006-01-31 | 2007-08-01 | Siemens Aktiengesellschaft | Nozzle box fixation |
EP2236764A2 (en) * | 2009-03-13 | 2010-10-06 | Kabushiki Kaisha Toshiba | Nozzle box of axial flow turbine and axial flow turbine |
EP3409895A1 (en) * | 2017-05-29 | 2018-12-05 | Siemens Aktiengesellschaft | Nozzle casing component for a steam turbine |
Also Published As
Publication number | Publication date |
---|---|
BR112022025362A2 (en) | 2023-01-03 |
EP4150195A1 (en) | 2023-03-22 |
CN115867718A (en) | 2023-03-28 |
WO2021259571A1 (en) | 2021-12-30 |
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