EP2282013A2 - Mesures pour l'élimination de l'humidité pour turbine à vapeur - Google Patents

Mesures pour l'élimination de l'humidité pour turbine à vapeur Download PDF

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Publication number
EP2282013A2
EP2282013A2 EP10167146A EP10167146A EP2282013A2 EP 2282013 A2 EP2282013 A2 EP 2282013A2 EP 10167146 A EP10167146 A EP 10167146A EP 10167146 A EP10167146 A EP 10167146A EP 2282013 A2 EP2282013 A2 EP 2282013A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
moisture removal
ring
slot
moisture
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Withdrawn
Application number
EP10167146A
Other languages
German (de)
English (en)
Other versions
EP2282013A3 (fr
Inventor
Tao Guo
Xiaoyue Liu
Jonathon Edward Slepski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP2282013A2 publication Critical patent/EP2282013A2/fr
Publication of EP2282013A3 publication Critical patent/EP2282013A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • 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
    • F01D9/065—Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids
    • 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
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage

Definitions

  • the present invention relates generally to a steam turbine and more particularly to strategically positioned moisture removal provisions for a steam turbine.
  • the steam can expand across a saturation line, condensation begins, and water can form. Accordingly, within the last few stages of a steam turbine, especially in front of the last stage bucket (LSB), the steam can be "wet", i.e., a mixture of steam and water droplets. These water droplets have negative effects on the turbine performance and can cause erosion to the rotating blades, especially near the tip region of the long rotating blade where the blade speed is high.
  • LSB steam turbine last stage bucket
  • special design features are typically implemented to prevent the condensed/accumulated water on the outer casing and/or nozzle surface from impacting on the rotating blades and /or blade covers.
  • One common approach is to use a continuous outer wall with an "overshooting" nozzle so the water on the outer casing can travel through the gap between the rotating blade cover and the casing without being re-entrained into the steampath.
  • the problem with this design approach is that the flow exiting the "overshooting" nozzle will directly impinge on the LSB cover. Since the LSB inlet flow Mach number is in general very high (can approach sonic or even become supersonic for long LSBs), the blockage of the LSB cover can cause significant penalty to the turbine last stage performance.
  • Another approach is to add a moisture removal slot right before the LSB, in order to make sure the water on the outer wall is removed. But the slot can disrupt the continuity of the outer wall and cause disturbance to the main flow which in turn has negative effect on the turbine performance.
  • Other approaches involving moisture removal provisions include using grooves to remove the water accumulated on the outer casing at the nozzle inlet or using slotted hollow nozzles to remove the deposited water on the nozzle surface.
  • a moisture removal system for a steam turbine including at least one perforated ring in an outer casing enclosing a stage of the steam turbine.
  • the ring is configured to allow moisture to pass therethrough out of a steam path of the steam turbine.
  • a first aspect of the invention provides a moisture removal system for a steam turbine, the system comprising: a ring for positioning in an outer casing enclosing a stage of the steam turbine, wherein the ring includes one or more holes extending from an inner diameter to an outer diameter of the ring, the holes configured to allow moisture to pass therethrough out of a steam path of the steam turbine.
  • a second aspect of the invention provides a moisture removal system for a steam turbine, the steam turbine having a last stage bucket, a next-to-last stage bucket, and a nozzle positioned between the last stage bucket and the next-to-last stage bucket, the nozzle and buckets positioned within an outer casing, the moisture removal system comprising: at least one moisture removal slot extending through the outer casing, wherein one moisture removal slot is positioned to be in-line with a trailing edge of a rotating blade of the next-to-last stage bucket; a first ring in the outer casing, the first ring positioned downstream of the moisture removal slot and upstream of the nozzle, the first ring including one or more holes extending from an inner diameter to an outer diameter of the ring, the holes configured to allow moisture to pass therethrough out of a steam path of the steam turbine; a channel extending from a first end within the nozzle and through the outer casing to a second end; a pressure side slot on a pressure side of the nozzle, the pressure side slot in fluid communication
  • FIG. 1 a moisture removal system 100 for a steam turbine according to embodiments of the invention is shown. While the entire steam turbine is not shown in FIG. 1 , an exemplary stage of the steam turbine and a next-to-last stage bucket are shown in FIG. 1 . As shown in FIG. 1 , a nozzle 104 is positioned between a next-to-last stage bucket 102 and a last stage bucket 106. Next-to-last stage bucket 102, nozzle 104 and last stage bucket 106 are positioned within an outer casing 101. As known in the art, steam travels downstream through the steam turbine, commonly referred to as the steampath, towards last stage bucket 106.
  • moisture removal system 100 provides a systematic approach to providing provisions to remove as much moisture as possible from the steampath, especially immediately prior to, or close to, last stage bucket 106.
  • Moisture removal system 100 includes at least one first ring 110 in outer casing 101, positioned between a nozzle and a bucket of a steam turbine.
  • first ring 110 is positioned downstream of next-to-last stage bucket 102 and upstream of nozzle 104.
  • First ring 110 is perforated, or porous, i.e., it includes one or more holes extending from an inner diameter to an outer diameter of first ring 110. These holes are configured to allow moisture to pass through first ring 110 out of a steam path of the steam turbine.
  • Moisture removal system 100 can further include at least one second ring 114 in outer casing 101, also positioned between a nozzle and bucket of a steam turbine.
  • second ring 114 can be positioned downstream of nozzle 104 and upstream of last stage bucket 106.
  • Second ring 114 is also perforated, or porous, i.e., it includes one or more holes extending from an inner diameter to an outer diameter of second ring 114. These holes are configured to allow moisture to pass through second ring 114 out of a steam path of the steam turbine.
  • second ring 114 can be positioned to remove any remaining moisture that was not removed by earlier provisions, as well as newly condensed water formed on outer casing 101.
  • second ring 114 can be positioned directly upstream of last stage bucket 106.
  • perforated rings 110, 114 are less disruptive to the steampath flow and so can be designed to cover a relatively larger axial segment which is advantageous for moisture removal.
  • perforated rings 110, 114 are less reflective (thus tending toward better removal of moisture) to those moisture droplets that spin off the trailing edge of a previous rotating blade and are impinging on outer casing 101.
  • Moisture removal system 100 can further include at least one moisture removal slot 108 which extends through outer casing 101.
  • Moisture removal slots 108 can be positioned in outer casing 101 wherever moisture is desired to be removed, for example, as in the embodiment shown FIG. 1 , a moisture removal slot 108 can be positioned upstream of first ring 110, and in-line with a trailing edge of the rotating blade of next-to-last stage bucket 102.
  • moisture removal slots 108 can be positioned to remove large droplets of moisture that are thrown off of the rotating blade of a previous stage of the steam turbine, for example, next-to-last stage bucket 102.
  • Moisture removal system 100 can further include a channel 113 extending from a first end 115 within nozzle 104 and through outer casing 101 to a second end 117.
  • Channel 113 is in fluid communication with slots 112 on both a pressure side and a suction side of nozzle 104.
  • at least one suction side slot 112a is provided on a suction side of nozzle 104
  • at least one pressure side slot 112b is provided on a pressure side of nozzle 104.
  • Both slots 112a and 112b are in fluid communication with first end 115 of channel 113 and are configured to allow moisture from a surface of nozzle 104 to flow through slots 112a, 112b into first end 115 of channel 113 and ultimately through second end 117 and through outer casing 101. As such, slots 112a, 112b are used to catch those moisture droplets that more or less follow the main steampath flow but are subsequently deposited on a surface of nozzle 104. As shown in FIGS. 1 and 2 , slots 112a, 112b may extend substantially longitudinally along nozzle 104. Second end 117 of channel 113 can be connected to a source of exhaust pressure 140 in order to draw moisture droplets through channel 113 out of the steampath.
  • a recessed or overshooting bucket cover design can be implemented.
  • a bucket cover 116 on last stage bucket 106 can be recessed into outer casing 101.
  • the flow exiting nozzle 104 will not directly impinge on last stage bucket cover 116, and the blockage of last stage bucket cover 116 will be significantly reduced, therefore improving the turbine last stage performance.
  • bucket cover 116 can be overshooting, i.e., not within outer casing 101.
  • bucket cover 116 can optionally include a tooth 118, extending from bucket cover 116 towards outer casing 101, to reduce steam leakage from a tip of bucket cover 116, in order to improve turbine performance.
  • Moisture removal system 100 disclosed herein can be utilized in any turbine where moisture is desired to be removed, for example, nuclear low pressure steam turbines or combined cycle low pressure steam turbines.
  • first,” “second,” and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and the terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
  • the modifier “about” used in connection with a quantity is inclusive of the stated value and has the meaning dictated by the context, (e.g., includes the degree of error associated with measurement of the particular quantity).
  • suffix "(s)” as used herein is intended to include both the singular and the plural of the term that it modifies, thereby including one or more of that term (e.g., the metal(s) includes one or more metals).
  • Ranges disclosed herein are inclusive and independently combinable (e.g., ranges of "up to about 25 wt%, or, more specifically, about 5 wt% to about 20 wt %", is inclusive of the endpoints and all intermediate values of the ranges of "about 5 wt% to about 25 wt%,” etc).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP10167146.9A 2009-06-30 2010-06-24 Mesures pour l'élimination de l'humidité pour turbine à vapeur Withdrawn EP2282013A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/494,419 US20100329853A1 (en) 2009-06-30 2009-06-30 Moisture removal provisions for steam turbine

Publications (2)

Publication Number Publication Date
EP2282013A2 true EP2282013A2 (fr) 2011-02-09
EP2282013A3 EP2282013A3 (fr) 2014-04-16

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EP10167146.9A Withdrawn EP2282013A3 (fr) 2009-06-30 2010-06-24 Mesures pour l'élimination de l'humidité pour turbine à vapeur

Country Status (4)

Country Link
US (1) US20100329853A1 (fr)
EP (1) EP2282013A3 (fr)
JP (1) JP2011012674A (fr)
RU (1) RU2010126330A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105697071A (zh) * 2014-12-15 2016-06-22 三菱日立电力系统株式会社 蒸汽涡轮机静叶片
CN110318820A (zh) * 2019-06-26 2019-10-11 西安交通大学 一种汽轮机的静叶复合除湿结构

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US8568090B2 (en) * 2009-12-07 2013-10-29 General Electric Company System for reducing the level of erosion affecting a component
JP5968173B2 (ja) * 2012-09-14 2016-08-10 三菱日立パワーシステムズ株式会社 蒸気タービン静翼及び蒸気タービン
US9394797B2 (en) * 2012-12-04 2016-07-19 General Electric Company Turbomachine nozzle having fluid conduit and related turbomachine
CN103055664A (zh) * 2013-01-22 2013-04-24 中国船舶重工集团公司第七�三研究所 船用方箱式弯管除湿装置
JP6000876B2 (ja) * 2013-03-12 2016-10-05 株式会社東芝 蒸気タービン
JP6145372B2 (ja) * 2013-09-27 2017-06-14 三菱日立パワーシステムズ株式会社 蒸気タービン動翼、及びそれを用いた蒸気タービン
JP6230383B2 (ja) * 2013-11-21 2017-11-15 三菱日立パワーシステムズ株式会社 蒸気タービンの静翼と蒸気タービン
EP2987968A1 (fr) * 2014-08-20 2016-02-24 Siemens Aktiengesellschaft Boîtier pour une turbine à vapeur et procédé de fonctionnement de celui-ci
CN110945212B (zh) * 2017-09-05 2022-07-08 三菱重工业株式会社 汽轮机叶片、汽轮机、以及汽轮机叶片的制造方法
JP7378970B2 (ja) * 2019-06-10 2023-11-14 三菱重工業株式会社 蒸気タービン静翼、蒸気タービンおよび蒸気タービン静翼の製造方法
US11927132B1 (en) 2023-02-10 2024-03-12 Rtx Corporation Water separator for hydrogen steam injected turbine engine

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CN105697071A (zh) * 2014-12-15 2016-06-22 三菱日立电力系统株式会社 蒸汽涡轮机静叶片
CN105697071B (zh) * 2014-12-15 2018-03-27 三菱日立电力系统株式会社 蒸汽涡轮机静叶片
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CN110318820A (zh) * 2019-06-26 2019-10-11 西安交通大学 一种汽轮机的静叶复合除湿结构
CN110318820B (zh) * 2019-06-26 2021-02-09 西安交通大学 一种汽轮机的静叶复合除湿结构

Also Published As

Publication number Publication date
US20100329853A1 (en) 2010-12-30
RU2010126330A (ru) 2012-01-10
JP2011012674A (ja) 2011-01-20
EP2282013A3 (fr) 2014-04-16

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