US20070081892A1 - Steam turbine exhaust diffuser - Google Patents
Steam turbine exhaust diffuser Download PDFInfo
- Publication number
- US20070081892A1 US20070081892A1 US11/243,974 US24397405A US2007081892A1 US 20070081892 A1 US20070081892 A1 US 20070081892A1 US 24397405 A US24397405 A US 24397405A US 2007081892 A1 US2007081892 A1 US 2007081892A1
- Authority
- US
- United States
- Prior art keywords
- steam
- volute
- flow path
- exhaust
- turbine
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
-
- 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
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
-
- 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 steam turbines and particularly relates to an exhaust diffuser in the shape of a volute.
- the inner case of the steam turbine for example a double flow down exhaust unit has an encompassing exhaust hood split vertically and extending along opposite sides and ends of the turbine.
- This large box-like structure houses the entire low pressure section of the turbine.
- the exhaust steam outlet from the turbine is generally conically shaped and the steam exhaust is redirected from a generally axial extending flow direction to a flow direction 90° relative to the axial flow direction.
- This 90° flow direction may be in any plane, downwardly, upwardly or transversely.
- the prior exhaust hoods for steam turbines constitute a large rectilinear structure at the exit end of the conical section for turning and diffusing the steam flow at right angles. The steam flow path was thus tortuous resulting in losses and adverse pressure drop.
- an axial flow steam turbine flow path comprising: a rotor and a casing defining the axial steam flow path; and an exhaust diffuser for the turbine including a volute for diffusing the exhaust steam and turning the exhaust steam from a generally axial flow direction to a generally transverse and tangential direction.
- FIG. 1 is a fragmentary schematic illustration of half of a double flow down exhaust steam turbine according to the prior art.
- FIG. 2 is a fragmentary side cross-sectional view of a steam turbine illustrating an exhaust diffuser having a volute configuration
- FIGS. 3 and 4 are axial end views of two embodiments of volutes which may be employed to receive the exhaust steam from the steam turbine.
- FIG. 1 there is illustrated a portion of a steam turbine, generally designated 10 , including a rotor 12 mounting a plurality of turbine buckets 14 .
- An inner casing 16 is also illustrated mounting a plurality of diaphragms 18 .
- a centrally disposed generally radial steam inlet 20 applies steam to each of the turbine buckets and stator blades on opposite axial sides of the turbine to drive the rotor.
- the stator vanes of the diaphragms 18 and the axially adjacent buckets 14 form the various stages of the turbine forming a flow path and it will be appreciated that the steam is exhausted from the final stage of the turbine for flow into a condenser not shown.
- an outer exhaust hood 22 which surrounds and supports the inner casing of the turbine as well as other parts such as the bearings.
- the turbine includes steam guides 24 for guiding the steam exhausting from the turbine into an outlet 26 for flow to one or more condensers.
- FIG. 2 there is illustrated an aspect of the present invention wherein like reference numerals as in FIG. 1 are applied to like parts preceded by the numeral 1 .
- the exhaust hood 22 of the prior art is completely eliminated in favor of a volute diffuser 40 .
- the diffuser 40 includes a diffusing conical section 42 coupled to the inner casing 116 by a flexible joint 44 .
- the volute 40 has an axis parallel to the axis of rotation of the rotor 112 .
- the axis of volute 40 is generally perpendicular to the direction of the general spiral flow about the axis and through the volute.
- the exhaust steam flowing substantially in an axial direction from the final stage of the turbine flows into the volute 40 where it changes its flow direction by about 90°.
- the geometry of the volute enables the steam to expand reducing its pressure.
- the volute 40 also guides the diffused steam through an outlet 46 coupled to one or more condensers, not shown.
- the volute 40 includes an internal passage 48 which increases in cross-sectional area in a direction toward the outlet 46 thereby diffusing the exhaust steam. It will be appreciated that the exit or outlet 46 need not be a down exhaust but can be a side or upwardly directed exhaust.
- a single volute can exhaust a single flow steam turbine or a pair of volutes may exhaust steam from double flow steam turbines.
- a double walled volute is illustrated having a divider wall 50 forming a pair of diffuser exit passages.
- the flexible connection may be of many different types such as an expansion bellows to allow for differential thermal expansion.
- the previously utilized exhaust hood is no longer necessary for the support of the turbine bearings.
- the bearings 54 may be supported on stanchions 56 in turn directly supported by the foundation of the turbine.
- the stanchions provide a rigid support for the bearings with improved turbine reliability as a result.
- the volute may be formed of a composite material, steel plate or pipe, structural steel, fiber-reinforced plastic or any combination of these materials to obtain the required structural integrity and desired steam flow diffusion characteristics.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/243,974 US20070081892A1 (en) | 2005-10-06 | 2005-10-06 | Steam turbine exhaust diffuser |
CNA2006101420320A CN1944962A (zh) | 2005-10-06 | 2006-09-30 | 蒸汽轮机的排气扩压器 |
EP06255126A EP1772595A3 (en) | 2005-10-06 | 2006-10-04 | Steam turbine exhaust diffuser |
JP2006273597A JP2007100701A (ja) | 2005-10-06 | 2006-10-05 | 蒸気タービン排気ディフューザ |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/243,974 US20070081892A1 (en) | 2005-10-06 | 2005-10-06 | Steam turbine exhaust diffuser |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070081892A1 true US20070081892A1 (en) | 2007-04-12 |
Family
ID=37395898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/243,974 Abandoned US20070081892A1 (en) | 2005-10-06 | 2005-10-06 | Steam turbine exhaust diffuser |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070081892A1 (ja) |
EP (1) | EP1772595A3 (ja) |
JP (1) | JP2007100701A (ja) |
CN (1) | CN1944962A (ja) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080286099A1 (en) * | 2007-05-17 | 2008-11-20 | General Electric Company | Steam turbine exhaust hood and method of fabricating the same |
US20090191052A1 (en) * | 2004-07-02 | 2009-07-30 | Brian Haller | Exhaust Gas Diffuser Wall Contouring |
US20100162705A1 (en) * | 2008-12-30 | 2010-07-01 | Sharrow Edward J | Methods, systems and/or apparatus relating to steam turbine exhaust diffusers |
US20100251716A1 (en) * | 2009-04-07 | 2010-10-07 | General Electric Company | Cooled exhaust hood plates for reduced exhaust loss |
US20100303620A1 (en) * | 2009-05-28 | 2010-12-02 | General Electric Company | Corrugated hood for low pressure steam turbine |
US20100303619A1 (en) * | 2009-05-28 | 2010-12-02 | General Electric Company | Shaped and stiffened lower exhaust hood sidewalls |
US20110176917A1 (en) * | 2004-07-02 | 2011-07-21 | Brian Haller | Exhaust Gas Diffuser Wall Contouring |
US20120207595A1 (en) * | 2011-02-11 | 2012-08-16 | Alstom Technology Ltd | Exhaust device for a steam turbine module |
US20130094956A1 (en) * | 2011-10-14 | 2013-04-18 | General Electric Company | Asymmetric butterfly plate for steam turbine exhaust hood |
US8662821B2 (en) | 2010-12-29 | 2014-03-04 | General Electric Company | Removable steam inlet assembly for steam turbine |
US8668450B2 (en) | 2010-12-29 | 2014-03-11 | General Electric Company | Removable upper steam guide segment for steam turbine |
US9057287B2 (en) | 2011-08-30 | 2015-06-16 | General Electric Company | Butterfly plate for a steam turbine exhaust hood |
US20150267565A1 (en) * | 2012-10-22 | 2015-09-24 | Nuovo Pignone Srl | Exhaust gas collector and gas turbine |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2295732A1 (en) * | 2009-09-14 | 2011-03-16 | Alstom Technology Ltd | Axial turbine and method for discharging a flow from an axial turbine |
CN102588016A (zh) * | 2011-01-05 | 2012-07-18 | 南阳汉冶特钢有限公司 | 蜗壳式对称排放器 |
CN102434233B (zh) * | 2011-12-09 | 2014-05-28 | 青岛捷能汽轮机集团股份有限公司 | 一种小型汽轮机的排汽缸 |
US20140119910A1 (en) * | 2012-10-29 | 2014-05-01 | General Electric Company | Turbine exhaust hood and related method |
EP3129608A1 (en) * | 2014-04-10 | 2017-02-15 | Siemens Aktiengesellschaft | Gas turbine exhaust system |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1269998A (en) * | 1915-02-01 | 1918-06-18 | Westinghouse Electric & Mfg Co | Steam-turbine. |
US1781108A (en) * | 1928-12-12 | 1930-11-11 | Worthington Pump & Mach Corp | Exhaust connection for condensers |
US1814629A (en) * | 1928-10-12 | 1931-07-14 | Westinghouse Electric & Mfg Co | Elastic fluid turbine |
US2047501A (en) * | 1934-05-03 | 1936-07-14 | Spontan Ab | Steam or gas turbine |
US2781057A (en) * | 1953-03-06 | 1957-02-12 | Power Jets Res & Dev Ltd | Turbine outlet ducting |
US2840342A (en) * | 1953-03-17 | 1958-06-24 | David H Silvern | Turbine exhaust |
US4390319A (en) * | 1979-09-25 | 1983-06-28 | Garkusha Anatoly V | Turbine exhaust hood |
US5104286A (en) * | 1991-02-08 | 1992-04-14 | Westinghouse Electric Corp. | Recirculation seal for a gas turbine exhaust diffuser |
US6134876A (en) * | 1997-11-26 | 2000-10-24 | General Electric Company | Gas turbine engine with exhaust expander and compressor |
US6419448B1 (en) * | 2000-03-20 | 2002-07-16 | Jerzy A. Owczarek | Flow by-pass system for use in steam turbine exhaust hoods |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB105933A (en) * | 1916-02-04 | 1917-05-04 | Karl Baumann | Improvements in or relating to Steam Turbines. |
US4961310A (en) * | 1989-07-03 | 1990-10-09 | General Electric Company | Single shaft combined cycle turbine |
-
2005
- 2005-10-06 US US11/243,974 patent/US20070081892A1/en not_active Abandoned
-
2006
- 2006-09-30 CN CNA2006101420320A patent/CN1944962A/zh active Pending
- 2006-10-04 EP EP06255126A patent/EP1772595A3/en not_active Withdrawn
- 2006-10-05 JP JP2006273597A patent/JP2007100701A/ja not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1269998A (en) * | 1915-02-01 | 1918-06-18 | Westinghouse Electric & Mfg Co | Steam-turbine. |
US1814629A (en) * | 1928-10-12 | 1931-07-14 | Westinghouse Electric & Mfg Co | Elastic fluid turbine |
US1781108A (en) * | 1928-12-12 | 1930-11-11 | Worthington Pump & Mach Corp | Exhaust connection for condensers |
US2047501A (en) * | 1934-05-03 | 1936-07-14 | Spontan Ab | Steam or gas turbine |
US2781057A (en) * | 1953-03-06 | 1957-02-12 | Power Jets Res & Dev Ltd | Turbine outlet ducting |
US2840342A (en) * | 1953-03-17 | 1958-06-24 | David H Silvern | Turbine exhaust |
US4390319A (en) * | 1979-09-25 | 1983-06-28 | Garkusha Anatoly V | Turbine exhaust hood |
US5104286A (en) * | 1991-02-08 | 1992-04-14 | Westinghouse Electric Corp. | Recirculation seal for a gas turbine exhaust diffuser |
US6134876A (en) * | 1997-11-26 | 2000-10-24 | General Electric Company | Gas turbine engine with exhaust expander and compressor |
US6419448B1 (en) * | 2000-03-20 | 2002-07-16 | Jerzy A. Owczarek | Flow by-pass system for use in steam turbine exhaust hoods |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110176917A1 (en) * | 2004-07-02 | 2011-07-21 | Brian Haller | Exhaust Gas Diffuser Wall Contouring |
US20090191052A1 (en) * | 2004-07-02 | 2009-07-30 | Brian Haller | Exhaust Gas Diffuser Wall Contouring |
US7895840B2 (en) * | 2004-07-02 | 2011-03-01 | Siemens Aktiengesellschaft | Exhaust gas diffuser wall contouring |
US7785068B2 (en) * | 2007-05-17 | 2010-08-31 | General Electric Company | Steam turbine exhaust hood and method of fabricating the same |
US20080286099A1 (en) * | 2007-05-17 | 2008-11-20 | General Electric Company | Steam turbine exhaust hood and method of fabricating the same |
US20100162705A1 (en) * | 2008-12-30 | 2010-07-01 | Sharrow Edward J | Methods, systems and/or apparatus relating to steam turbine exhaust diffusers |
US20100251716A1 (en) * | 2009-04-07 | 2010-10-07 | General Electric Company | Cooled exhaust hood plates for reduced exhaust loss |
US8161749B2 (en) | 2009-04-07 | 2012-04-24 | General Electric Company | Cooled exhaust hood plates for reduced exhaust loss |
US8221053B2 (en) | 2009-05-28 | 2012-07-17 | General Electric Company | Shaped and stiffened lower exhaust hood sidewalls |
US20100303619A1 (en) * | 2009-05-28 | 2010-12-02 | General Electric Company | Shaped and stiffened lower exhaust hood sidewalls |
US20100303620A1 (en) * | 2009-05-28 | 2010-12-02 | General Electric Company | Corrugated hood for low pressure steam turbine |
US8221054B2 (en) | 2009-05-28 | 2012-07-17 | General Electric Company | Corrugated hood for low pressure steam turbine |
US8662821B2 (en) | 2010-12-29 | 2014-03-04 | General Electric Company | Removable steam inlet assembly for steam turbine |
US8668450B2 (en) | 2010-12-29 | 2014-03-11 | General Electric Company | Removable upper steam guide segment for steam turbine |
US20120207595A1 (en) * | 2011-02-11 | 2012-08-16 | Alstom Technology Ltd | Exhaust device for a steam turbine module |
US9243516B2 (en) * | 2011-02-11 | 2016-01-26 | Alstom Technology Ltd | Exhaust device for a steam turbine module |
US9057287B2 (en) | 2011-08-30 | 2015-06-16 | General Electric Company | Butterfly plate for a steam turbine exhaust hood |
RU2603227C2 (ru) * | 2011-08-30 | 2016-11-27 | Дженерал Электрик Компани | Поворотная пластина |
US20130094956A1 (en) * | 2011-10-14 | 2013-04-18 | General Electric Company | Asymmetric butterfly plate for steam turbine exhaust hood |
US9062568B2 (en) * | 2011-10-14 | 2015-06-23 | General Electric Company | Asymmetric butterfly plate for steam turbine exhaust hood |
US20150267565A1 (en) * | 2012-10-22 | 2015-09-24 | Nuovo Pignone Srl | Exhaust gas collector and gas turbine |
Also Published As
Publication number | Publication date |
---|---|
JP2007100701A (ja) | 2007-04-19 |
EP1772595A3 (en) | 2009-02-25 |
CN1944962A (zh) | 2007-04-11 |
EP1772595A2 (en) | 2007-04-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHARROW, EDWARD;REEL/FRAME:017076/0784 Effective date: 20051004 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |