US20130064665A1 - Low pressure steam turbine including pivotable nozzle - Google Patents

Low pressure steam turbine including pivotable nozzle Download PDF

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Publication number
US20130064665A1
US20130064665A1 US13/230,985 US201113230985A US2013064665A1 US 20130064665 A1 US20130064665 A1 US 20130064665A1 US 201113230985 A US201113230985 A US 201113230985A US 2013064665 A1 US2013064665 A1 US 2013064665A1
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US
United States
Prior art keywords
nozzle
steam turbine
stage
bucket
segment
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.)
Abandoned
Application number
US13/230,985
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English (en)
Inventor
Roy Paul Swintek
Asif Iqbal Ansari
Joshy John
Moorthi Subramaniyan
Lakshmanan Valliappan
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
Priority to US13/230,985 priority Critical patent/US20130064665A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANSARI, ASIF IQBAL, JOHN, JOSHY, Subramaniyan, Moorthi, VALLIAPPAN, LAKSHMANAN, SWINTEK, ROY PAUL
Priority to FR1258097A priority patent/FR2979941A1/fr
Priority to DE102012108184A priority patent/DE102012108184A1/de
Priority to RU2012138919/06A priority patent/RU2012138919A/ru
Publication of US20130064665A1 publication Critical patent/US20130064665A1/en
Abandoned 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
    • F05D2250/312—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being parallel to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
    • F05D2250/313—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being perpendicular to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
    • F05D2250/314—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being inclined in relation to each other

Definitions

  • the subject matter disclosed herein relates to a low pressure steam turbine system including pivotable (or, variable area) steam turbine nozzles (or, guidevanes). Specifically, the subject matter disclosed herein relates to a low pressure steam turbine having variable nozzles with variable operating areas in its low pressure section for improving the efficiency or extending the operating envelope of the steam turbine system.
  • Steam turbine power systems are designed and built with particular load conditions in mind. Often, these systems are designed and optimized to handle the peak or near-peak loads of their customers, and/or coincide with average day ambient temperatures and condenser backpressures. These conditions can typically drive selection of large last stage vane (or, bucket) annulus area in the steam turbine low pressure section. However, during periods of lower demand, higher ambient temperatures, or higher condenser backpressures, these systems must run at off-peak conditions. For example, a steam turbine power system may reduce its output to well below fifty percent of its rated power during the evening hours (e.g., after 9:00 pm local time), when customers require very little electricity. Reducing the output of the steam turbine power system to such levels may cause, among other things, system inefficiencies (e.g. low pressure section exhaust losses) and mechanical integrity concerns (e.g. for last stage buckets), as the steam turbine is not designed for these conditions.
  • system inefficiencies e.g. low pressure section exhaust losses
  • mechanical integrity concerns e.g. for last stage buckets
  • the steam turbine includes: a rotor having: a rotor body; and a plurality of bucket stages disposed axially along the rotor body, the plurality of bucket stages including a last bucket stage; and a nozzle assembly at least partially surrounding the rotor, the nozzle assembly including a plurality of nozzle stages corresponding to the plurality of bucket stages, wherein a nozzle in a nozzle stage axially upstream of the last bucket stage is adjustable to modify a fluid flow within the last bucket stage during operation of the steam turbine.
  • a first aspect of the invention includes a low pressure steam turbine having: a rotor having: a rotor body; and a plurality of bucket stages disposed axially along the rotor body, the plurality of bucket stages including a last bucket stage; and a nozzle assembly at least partially surrounding the rotor, the nozzle assembly including a plurality of nozzle stages corresponding to the plurality of bucket stages, wherein a nozzle in a nozzle stage axially upstream of the last bucket stage is adjustable to modify a fluid flow within the last bucket stage during operation of the steam turbine.
  • a second aspect of the invention includes a low pressure steam turbine system having: a rotor having: a diffuser section; a turbine coupled to the diffuser section, the turbine including: a rotor body; and a plurality of bucket stages disposed axially along the rotor body, the plurality of bucket stages including a last bucket stage; a nozzle assembly at least partially surrounding the rotor, the nozzle assembly including a plurality of nozzle stages corresponding to the plurality of bucket stages, wherein a nozzle in a nozzle stage axially upstream of the last bucket stage is adjustable to modify a fluid flow within the last bucket stage or the diffuser during operation of the steam turbine; and a control system operably connected to the nozzle stage, the control system configured to actuate pivoting of the nozzle in response to a predetermined load condition.
  • a third aspect of the invention includes a low pressure steam turbine apparatus having: a diffuser section; a turbine coupled to the diffuser section, the turbine including: a rotor having: a rotor body; and a plurality of bucket stages disposed axially along the rotor body, the plurality of bucket stages including a last bucket stage; and a stator substantially surrounding the rotor, the stator including: a nozzle assembly at least partially surrounding the rotor, the nozzle assembly including a plurality of nozzle stages corresponding to the plurality of bucket stages, wherein a nozzle in a nozzle stage axially upstream of the last bucket stage is pivotable about an axis to modify a fluid flow within the last bucket stage or the diffuser during operation of the steam turbine.
  • FIG. 1 shows a two dimensional cross-sectional view of a portion of a steam turbine according to embodiments of the invention.
  • FIG. 2 shows a three-dimensional perspective view of a portion of a steam turbine nozzle stage according to embodiments of the invention.
  • FIG. 3 shows a schematic view of a steam turbine system according to embodiments of the invention.
  • FIG. 4 shows a two-dimensional cross-sectional view of a portion of a low pressure steam turbine last stage according to embodiments of the invention.
  • FIG. 5 shows an illustrative exhaust loss graph for reference purposes.
  • aspects of the invention provide for a steam turbine system including variable area (e.g., pivotable) steam turbine nozzles (or, guidevanes).
  • variable area e.g., pivotable
  • steam turbine nozzles or, guidevanes
  • the subject matter disclosed herein relates to a steam turbine having variable area nozzles in its low pressure section for improving the efficiency or mechanical life at off-design loads of the steam turbine system.
  • Steam turbine power systems are designed and built with particular load conditions in mind. Often, these systems are built to handle the peak or near-peak loads of their customers, which may coincide with afternoon hours where the ambient temperature is high (e.g., above 27 degrees Celsius). However, during periods of lower demand, these systems must run at off-peak loads. For example, a steam turbine power system may reduce its output to well below fifty percent of its rated power during the evening hours (e.g., after 9:00 pm local time), when customers require very little electricity. Reducing the output of the steam turbine power system to such levels may cause, among other things, system inefficiencies, as the steam turbine is not designed with these conditions in mind. Additionally, inefficiencies may occur in the steam turbine when high back-pressure is generated in the condenser, such as on days when the ambient temperature is particularly high and the condenser runs above its designed conditions.
  • the axial space upstream or downstream of the steam turbine's last bucket stage may experience fluid-dynamic conditions that cause inefficient rotation of the last-stage buckets in that stage, or turn-up losses in the exhaust (or, diffuser). That is, reduced steam flow or high back pressure causes less steam flow (and/or irregular flow) through this axial space, which is traditionally filled by steam flow under design conditions.
  • This reduced/irregular steam flow generates vortex effects, irregular flow patterns and substantially stagnant regions, which may disrupt the intended movement of steam through the last stage buckets, and impair the diffusion by the exhaust downstream of the last stage bucket. This disruption may affect the torque generated by the rotor body, and subsequently, the output of the steam turbine (e.g., the low pressure steam turbine).
  • aspects of the invention allow for modification of the steam flow path axially upstream of the last stage buckets using at least one adjustable (e.g., variable area) nozzle stage, which can be adjusted during operation of the steam turbine including the last stage nozzle.
  • adjustable area nozzle may refer to a nozzle that has a fluid-facing surface with an adjustable angle and/or a adjustable surface area with respect to the fluid flow. That is, the nozzle's axially upstream-facing surface angle may be variable, e.g., via mechanical manipulation of the nozzle. It is understood that this mechanical manipulation may be achieved in a number of ways described herein.
  • each variable-area nozzle may be pivotable, rotatable, slideable, foldable, etc. about an axis or pivot point such that at least one fluid facing surface has a modifiable angle.
  • the nozzle airfoil itself may be pivotable, or nozzle-sidewall couplings may be pivotable about a particular axis or pivot point.
  • the nozzle airfoil may be segmented such that one or more segments pivot about one or more axes to modify the flow profile (speed, direction, etc.) across the airfoil or modify the fluid passing area between the nozzle and adjacent nozzle.
  • the low pressure steam turbine 10 may include a rotor 12 having a rotor body 14 , and a stator 16 having a nozzle assembly (where one nozzle stage 18 of the nozzle assembly is illustrated) at least partially surrounding the rotor body 14 .
  • the nozzle assembly (including stage 18 ) may have an inner diaphragm segment 20 and an outer diaphragm segment 22 , which may take the form of diaphragm rings, as is known in the art.
  • the diaphragm segments 20 , 22 may hold (e.g., via mechanical connection such as welded bonding, jointing, or other suitable connection) a nozzle airfoil (e.g. partition) 24 in position to guide a working fluid (e.g., steam) across a plurality of turbine buckets 26 (one depicted in this view).
  • a working fluid e.g., steam
  • the turbine bucket 26 may be one of a plurality of buckets in a particular bucket stage of a turbine.
  • a last bucket stage 28 is shown herein, where the last bucket stage 28 is located axially downstream (closer to the lower-pressure portion) of the steam turbine 10 than the nozzle 24 .
  • the nozzle 24 (including the nozzle airfoil and/or sidewalls 25 , 27 ) may be pivotable about an axis, thereby allowing the nozzle 24 to modify the flow of fluid within the last bucket stage 28 (e.g., across the bucket 26 ), across a space 29 axially upstream of the bucket 26 . That is, the nozzle 24 , including one or more sidewalls 25 , 27 , may be configured to pivot about an axis to modify the area between adjacent nozzle airfoils, thereby altering the fluid flow axially, radially, and/or circumferentially across the face of the nozzle 24 .
  • FIG. 1 depicts three illustrative axes about which the nozzle 24 may pivot.
  • the nozzle 24 may pivot about an axis (i), which run substantially perpendicular with the primary axis (a) of the rotor body 14 .
  • Axis (i) may intersect the primary axis (a) such that it spans radially from the primary axis (a) of the rotor body 14 .
  • the nozzle 24 may pivot about an axis (ii), which runs substantially parallel with the primary axis (a) of the rotor body 14 .
  • the nozzle 24 may pivot about an axis (iii, into and out of the page) tangential to a circumference of the stator 16 .
  • the nozzle 24 may pivot about an axis (iii) formed by a portion of a circular shape (or substantially circular shape) concentric with a circumference of the stator 16 .
  • FIG. 1 depicts a single nozzle stage 18 and a single bucket stage 28
  • the low pressure steam turbine 10 may include a plurality of nozzle stages and corresponding bucket stages.
  • the plurality of nozzle stages may be configured to direct a working fluid (e.g., steam) across the buckets (e.g., bucket 26 ) in order to force rotation of those buckets, and consequently, rotation of the rotor body (or, shaft) 14 about its primary axis (a).
  • a working fluid e.g., steam
  • FIG. 2 a three-dimensional perspective view of a portion of a steam turbine nozzle stage 28 is shown according to another embodiment of the invention. It is understood that commonly numbered elements between the figures may indicate substantially identical components. Redundant explanation of these components has been omitted herein for clarity.
  • the nozzle stage 28 may include a plurality of nozzles 24 (and/or nozzles 34 ) configured to be arranged circumferentially about a rotor (rotor not shown).
  • each nozzle stage 18 may be formed from upper and lower diaphragm segments, which may be joined at a horizontal joint surface of the steam turbine. Illustration of the interaction between upper and lower diaphragm segments is omitted herein for clarity, however, it is understood that the portion of the nozzle stage 18 shown in FIG. 2 may be a portion of a lower (or upper) diaphragm segment. In any case, as illustrated in FIG.
  • At least one nozzle 34 of a plurality of nozzles may include a multi-segmented body having a first segment 34 A and a second segment 34 B operably connected to the first segment 34 A (e.g., along the axis (i)).
  • the first segment 34 A is configured to pivot relative to the second segment 34 B about the axis (e.g., axis (i)).
  • the nozzle 34 may be hinged (e.g., via conventional pins, joints, perforations, etc.) such that the first segment 34 A may move relative to the second segment 34 B.
  • the sidewalls 25 , 27 may include oversized slots proximate the first segment 34 A such that the first segment has a range of motion of approximately plus or minus 30 degrees within the sidewalls 25 , 27 .
  • the position of second segment 34 B may be fixed, while the position of first segment 34 A may be alterable via movement of the first segment 34 A.
  • the first segment 34 A may be fixed, while the position of the second segment 34 B may be alterable via movement of the second segment 34 B.
  • one or more nozzles may be configured to pivot as a single unit, such that segments (e.g., segments 34 A, 34 B) are eliminated.
  • the nozzles e.g., nozzles 24 and/or 34
  • the nozzles e.g., nozzles 24 and/or 34
  • sidewalls 25 , 27 may be configured to move (e.g., pivot) collectively within slots in the inner and outer diaphragm segments 20 , 22 , respectively.
  • FIG. 3 a schematic view of a steam turbine system 30 is shown according to embodiments of the invention.
  • the steam turbine system 30 may include a control system 32 , coupled to the steam turbine 10 (e.g., via wireless, hard-wired and/or electro-mechanical means).
  • movement of the nozzles is actuated via a control system 32 , which may be an electro-mechanical control system configured to provide commands to a mechanical device (e.g., a lever or actuator for each individual nozzle, or for groups of nozzles, a sliding track-based system, a pneumatic system, hydraulic system, electric system, manual system, electro-hydraulic system, etc.).
  • a mechanical device e.g., a lever or actuator for each individual nozzle, or for groups of nozzles, a sliding track-based system, a pneumatic system, hydraulic system, electric system, manual system, electro-hydraulic system, etc.
  • the control system 32 may be part of (or configured to interact with) a conventional steam turbine control system (not shown), and may include associated user interface controls such that the pivoting nozzles 24 , 34 (and/or sidewalls 25 , 27 ) may be actuated (e.g., pivoted, rotated, etc.) via a command from a human operator.
  • actuation of the pivoting nozzles e.g., nozzles 24 and/or 34
  • pre-programmed commands that respond to pre-determined load conditions, e.g., part load (less than 50 % rated power), low part load (less than 30% rated power), and/or increased condenser pressure.
  • this increase in pressure could be an increment as small as 0.5 inches Hg absolute above optimal design conditions for a last stage bucket.
  • this increase may be greater, e.g., several inches Hg absolute, or the additive combination of both part load and increased condenser pressure above.
  • FIG. 4 shows a two-dimensional cross-sectional view of a portion of a low pressure steam turbine last stage 400 , along with a diffuser 430 according to embodiments of the invention.
  • the last stage 400 can include a last stage nozzle 410 and a last stage bucket 420 , which is configured to rotate along with a rotor in the low pressure steam turbine (both not shown) as is known in the art.
  • the flow from last stage bucket 420 enters the diffuser section 430 of the steam turbine to be routed to the condenser, as indicated by arrows in FIG. 4 .
  • the last stage nozzle 410 is adjustable to modify a fluid flow within the last stage 400 , or within diffuser 430 downstream of the last stage 400 , during operation of the steam turbine.
  • the last stage nozzle 410 can pivot about one or more axes, e.g., axes i-i, ii-ii, and/or iii-iii.
  • the last stage nozzle 410 can be adjusted in any manner described herein, such as those described with reference to nozzles 24 , 34 .
  • actuation of the pivoting nozzles may be implemented when the last stage annulus velocity of the steam turbine drops below a mechanical or performance threshold.
  • FIG. 5 an example graph 500 of an exhaust loss curve 510 is shown for illustrative purposes only. As shown, the graph 500 includes a low pressure steam turbine's exhaust loss plotted against a last stage bucket's annulus velocity, shown as an exhaust loss curve 510 . Also illustrated is an operating region 520 , which denotes a region of dramatic exhaust losses as the annulus velocity of the last stage bucket decreases.
  • aspects of the invention allow for adjusting of the last stage nozzle (as described herein) when the last stage bucket's annulus velocity drops below a certain threshold.
  • a certain threshold can be approximately 450 feet/second, or where exhaust losses start exceeding 10 BTUs/lbm.
  • adjustment of the last stage nozzles could also be dictated by mechanical considerations (e.g., windage, overheating, bucket flutter/instability), which can be tied to another annulus velocity threshold, e.g., approximately 300 feet/second or less of annulus velocity.
  • combinations of higher back-pressures from the condenser could contribute to the concerns noted above, which could modify the annulus velocity thresholds noted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US13/230,985 2011-09-13 2011-09-13 Low pressure steam turbine including pivotable nozzle Abandoned US20130064665A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/230,985 US20130064665A1 (en) 2011-09-13 2011-09-13 Low pressure steam turbine including pivotable nozzle
FR1258097A FR2979941A1 (fr) 2011-09-13 2012-08-30 Turbine a vapeur basse pression pourvue d'un distributeur pivotant
DE102012108184A DE102012108184A1 (de) 2011-09-13 2012-09-04 Niederdruckdampfturbine mit schwenkbarer Düse
RU2012138919/06A RU2012138919A (ru) 2011-09-13 2012-09-12 Паровая турбина низкого давления, содержащая поворотное сопло

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/230,985 US20130064665A1 (en) 2011-09-13 2011-09-13 Low pressure steam turbine including pivotable nozzle

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US20130064665A1 true US20130064665A1 (en) 2013-03-14

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Application Number Title Priority Date Filing Date
US13/230,985 Abandoned US20130064665A1 (en) 2011-09-13 2011-09-13 Low pressure steam turbine including pivotable nozzle

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US (1) US20130064665A1 (de)
DE (1) DE102012108184A1 (de)
FR (1) FR2979941A1 (de)
RU (1) RU2012138919A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015001228A (ja) * 2013-06-17 2015-01-05 アルストム テクノロジー リミテッドＡＬＳＴＯＭ Ｔｅｃｈｎｏｌｏｇｙ Ｌｔｄ 蒸気タービンにおける低体積流量の不安定性の制御
CN110953022A (zh) * 2019-11-25 2020-04-03 东方电气集团东方汽轮机有限公司 一种汽轮机喷嘴组及六弧段全周进汽式喷嘴结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5269648A (en) * 1991-04-08 1993-12-14 Asea Brown Boveri Ltd. Arrangement for controlling the flow cross section of a turbomachine
US5494405A (en) * 1995-03-20 1996-02-27 Westinghouse Electric Corporation Method of modifying a steam turbine
US20090148282A1 (en) * 2007-12-10 2009-06-11 Mccaffrey Michael G 3d contoured vane endwall for variable area turbine vane arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5269648A (en) * 1991-04-08 1993-12-14 Asea Brown Boveri Ltd. Arrangement for controlling the flow cross section of a turbomachine
US5494405A (en) * 1995-03-20 1996-02-27 Westinghouse Electric Corporation Method of modifying a steam turbine
US20090148282A1 (en) * 2007-12-10 2009-06-11 Mccaffrey Michael G 3d contoured vane endwall for variable area turbine vane arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015001228A (ja) * 2013-06-17 2015-01-05 アルストム テクノロジー リミテッドＡＬＳＴＯＭ Ｔｅｃｈｎｏｌｏｇｙ Ｌｔｄ 蒸気タービンにおける低体積流量の不安定性の制御
CN110953022A (zh) * 2019-11-25 2020-04-03 东方电气集团东方汽轮机有限公司 一种汽轮机喷嘴组及六弧段全周进汽式喷嘴结构

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Publication number Publication date
FR2979941A1 (fr) 2013-03-15
RU2012138919A (ru) 2014-03-20
DE102012108184A1 (de) 2013-03-14

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