EP3734025A1 - Steam turbine with standardized casing - Google Patents
Steam turbine with standardized casing Download PDFInfo
- Publication number
- EP3734025A1 EP3734025A1 EP19171955.8A EP19171955A EP3734025A1 EP 3734025 A1 EP3734025 A1 EP 3734025A1 EP 19171955 A EP19171955 A EP 19171955A EP 3734025 A1 EP3734025 A1 EP 3734025A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casing
- power equipment
- fluid
- fluid power
- exhaust
- 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.)
- Pending
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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
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
- F01D25/265—Vertically split casings; Clamping arrangements therefor
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- 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
- F05D2230/00—Manufacture
- F05D2230/50—Building or constructing in particular ways
- F05D2230/51—Building or constructing in particular ways in a modular way, e.g. using several identical or complementary parts or features
-
- 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
- F05D2230/00—Manufacture
- F05D2230/60—Assembly methods
- F05D2230/61—Assembly methods using limited numbers of standard modules which can be adapted by machining
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
- The present invention relates to an exhaust arrangement for a fluid power equipment, such as, a steam turbine. More particularly the present invention relates to a casing of the fluid power equipment, having a customizable exhaust arrangement to accommodate variations in the steam path configuration, for example, a quantity of stages of the fluid power equipment.
-
FIG 1 illustrates an elevation view of an active part of afluid power equipment 100, that is, a steam turbine, of the state of the art, as mentioned above. Thesteam turbine 100 of the state of the art, especially when designed for smaller power ranges, comprises acasing 101 carrying various stages of the turbine there-within in anarea 101B of thecasing 101, and at arear end 101A of thefluid power equipment 100, an exhaust casing (not shown) is additionally attached to direct steam flow to a condenser (not shown) for condensing applications or to a customer supply (not shown) for backpressure applications.Conventional turbine casings 101 are designed to be of a standard length to avoid design variations which may lead to design delays and increase in manufacturing and fabrication costs. Fixedlength casings 101 may be optimized based on thermodynamic properties to increase power output and improve performance as demanded by the application. Typically, a fixed length of theturbine casing 101 is determined considering maximum number of stages that are demanded on an average. In cases where the number of stage requirements is less, then there is an extra space indicated inFIG 1 by a distance of Y mm which is about 250 mm for smaller power applications, left in the configured fixedlength turbine casing 101 leading to an over-designed equipment. - Moreover, longer the
turbine casing 101, farther is the bearing centre, indicated in theFIG 1 by a distance of X mm which is about 300mm for smaller power applications. This in turn, requires larger sized rotors thereby posing challenges for rotor-dynamics due to increased flexibility of the rotor. This may lead to an overall increase in the costs and loss of business against competitors. - Therefore, it is an object of the present invention to provide a fluid power equipment of the aforementioned kind, which is cost effective and can be easily configured to accommodate various stage requirements.
- The fluid power equipment disclosed in the present invention achieves the aforementioned object, in that the fluid power equipment comprises an exhaust arrangement machineable based on number of stages to be accommodated in the fluid power equipment.
- According to the present invention, a fluid power equipment is provided. As used herein, "fluid power equipment" refers to an electro-mechanical device such as turbomachinery. The fluid power equipment disclosed herein is a steam turbine. Advantageously, the fluid power equipment is an industrial steam turbine and specifically a back-pressure turbine employed in facilities such as oil refineries, petrochemical industry, paper-pulp industry, fibre industry, food industry, etc., where large amounts of steam demand is prevalent. The fluid power equipment disclosed herein, includes at least one stage and a casing. The stages comprise multiple nozzles and blades. The casing accommodates the stages there-within.
- The casing is configured to have a machineable exhaust arrangement. As used herein, the term "machineable" refers to an arrangement permitting removal of a material, for example, cutting of a metal. Also used herein, "exhaust arrangement" refers to a section of a wall of the casing which when machined from the casing, enables exhaust mass produced during operation of the fluid power equipment to flow there-through. The exhaust arrangement is configured to have a circular cross section. Advantageously, the exhaust arrangement, that is, the physical dimensions, are configured based on one or more fluid dynamics parameters associated with a fluid used in the fluid power equipment. The fluid dynamics parameters comprise, for example, a pressure of the fluid, a velocity of the fluid, and a volumetric flow of the fluid, etc. Upon configuration of the exhaust arrangement, the casing is configured so as to have an area defined by the exhaust arrangement marked on a wall of the casing. This enables the design engineers and other manufacturing personnel to identify the exhaust arrangement. The exhaust arrangement is machined based on a number of stages to be accommodated in the fluid power equipment. When the fluid power equipment is being designed for an application requiring up to three stages, then the exhaust arrangement is machined from the casing. Whereas, when the fluid power equipment is being designed for an application requiring more than three stages, then the exhaust arrangement is not machined. Thus, advantageously, the casing disclosed herein is configured as a common casing that can accommodate up to five stages of the fluid power equipment without requirement of re-designing of the casing. This is achieved due to the aforementioned exhaust arrangement. According to another embodiment of the present invention, the exhaust arrangement is configured as a bleed arrangement or an extraction arrangement within the fluid power equipment.
- The fluid power equipment comprises a leakage prevention unit disposable against one of the faces of the casing. The leakage prevention unit maintains a direction of flow of exhaust mass generated by the fluid power equipment during operation of the fluid power equipment. The leakage prevention unit is configured as a seal, in the shapes comprising, for example, a lid, a plate, a pipe, etc. The leakage prevention unit, according to one embodiment, when disposed against the face of the casing, enables maximal flow of exhaust mass of the fluid power equipment via the machined exhaust arrangement. That is, when the fluid power equipment is having less than or equal to three stages, the leakage prevention unit is designed, for example, as a sealing plate, so as to direct the exhaust mass flow through the exhaust arrangement. Whereas, when the fluid power equipment is having more than three stages, the leakage prevention unit is designed, for example, as an exhaust pipe, so as to direct the exhaust mass flow through itself into a condenser or to a supply for backpressure applications. The exhaust pipe in such cases is, for example, the exhaust casing used in backpressure type steam turbines or condensing type steam turbines. Thus, one or more physical dimensions of the leakage prevention unit are configured based on a number of stages to be accommodated in the fluid power equipment.
- Also, disclosed herein, is a casing of a fluid power equipment, for example, a turbine casing, configurable to accommodate there-within at least one stage comprising multiple blades and nozzles. The casing comprises an exhaust arrangement. Advantageously, the exhaust arrangement enables the casing to be used for up to five stages with minimal machining and assembling. The exhaust arrangement is machined based on a number of the stages to be accommodated in the casing, for example, for up to three stages. The exhaust arrangement is configured based on one or more fluid dynamics parameters associated with a fluid used in the fluid power equipment, for example, a pressure of the fluid, a velocity of the fluid, and a volumetric flow of the fluid, etc.
- The above-mentioned and other features of the invention will now be addressed with reference to the accompanying drawings of the present invention. The illustrated embodiments are intended to illustrate, but not limit the invention.
- The present invention is further described hereinafter with reference to illustrated embodiments shown in the accompanying drawings, in which:
- FIG 1
- illustrates an elevation view of an active part of a steam turbine, of the state of the art.
- FIGS 2A-2B
- illustrate elevation views of steam turbines, according to an embodiment of the present invention.
- FIGS 3A-3C
- illustrate perspective views of turbine casing for the steam turbines shown in
FIGS 2A-2B , having a machineable exhaust arrangement, according to an embodiment of the present invention. - FIGS 4A-4C
- illustrate a leakage prevention unit disposable against the turbine casing shown in
FIGS 3A-3C , according to the present invention. - Various embodiments are described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for the purpose of explanation, numerous specific details are set forth in order to provide thorough understanding of one or more embodiments. It may be evident that such embodiments may be practiced without these specific details.
-
FIGS 2A-2B illustrate elevation views ofsteam turbines FIG 2A illustrates a three-stage steam turbine 201. Each of thestages 201A of the three-stage steam turbine 201 comprise multiple blades and nozzles (not shown) accommodated within aturbine casing 203.FIG 2B illustrates a five-stage steam turbine 202. Each of thestages 201A of the five-stage steam turbine 202 are accommodated within theturbine casing 203. As seen inFIGS 2A and 2B , acommon turbine casing 203 can be used to accommodate stages ranging from one to five. This stage accommodation variability using a fixedlength turbine casing 203 is possible due to anexhaust arrangement 203A shown inFIG 2A and 2B . Theexhaust arrangement 203A comprises a portion of the casing configured such that it can be machined, that is, removed if required. After removal of the portion, the machinedexhaust arrangement 203A' shown inFIG 2A enables theturbine casing 203 to be used for a three-stage steam turbine 201. Whereas, if there are more than threestages 201A to be accommodated within theturbine casing 203 then theexhaust arrangement 203A is not machined, that is, not removed from theturbine casing 203. Thus, thesame turbine casing 203 can be used for up to five stages of a steam turbine. -
FIGS 3A-3C illustrate perspective views ofturbine casing 203 for thesteam turbines machineable exhaust arrangement 203A shown inFIGS 2A-2B , according to an embodiment of the present invention.FIG 3A shows theturbine casing 203. Initially, theexhaust arrangement 203A is closed with aninner wall 203C of theturbine casing 203. On theinner wall 203C,multiple grooves 203B are machined, each configured to accommodate aturbine stage 201A therein, shown inFIG 2A .FIG 3B shows theturbine casing 203 with a machinedexhaust arrangement 203A' as theturbine casing 203 is for a three-stage arrangement. In this case, aface 203D of theturbine casing 203 is configured so as to be operably coupled with a leakage prevention unit directing the exhaust mass of thesteam turbine exhaust arrangement 203A' only.FIG 3C shows theturbine casing 203 havinggrooves 203B extended in number to accommodate five stages of thesteam turbine exhaust arrangement 203A is not machined out from theturbine casing 203 and theface 203D is sealed with help of a standard backpressure or condensing type exhaust casing directing the exhaust mass flow via the exhaust casing. -
FIGS 4A-4C illustrate aleakage prevention unit turbine casing 203 shown inFIGS 3A-3C , according to the present invention.FIG 4A shows aleakage prevention unit 401 configured as a circular plate. Aface 401A of the plate operably couples with theface 203D of theturbine casing 203 shown inFIG 3B to enable the exhaust mass to flow through the machinedexhaust arrangement 203A'.FIGS 4B and4C showleakage prevention units faces face 203D shown inFIG 3C . Theleakage prevention units exhaust arrangement 203A is not machined from theturbine casing 203. In these cases, the exhaust mass flows through theexhaust pipes FIGS 4B and4C . - The foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention disclosed herein. While the invention has been described with reference to various embodiments, it is understood that the words, which have been used herein, are words of description and illustration, rather than words of limitation. Further, although the invention has been described herein with reference to particular means, materials, and embodiments, the invention is not intended to be limited to the particulars disclosed herein; rather, the invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims. Those skilled in the art, having the benefit of the teachings of this specification, may affect numerous modifications thereto and changes may be made without departing from the scope and spirit of the invention in its aspects.
-
- 100
- fluid power equipment of state of the art
- 101
- turbine casing of the state of the art
- 101A
- rear end of the fluid power equipment of the state of the art
- 101B
- area of the casing accommodating stages, of the state of the art
- 201, 202
- fluid power equipment (steam turbines having three and five stages respectively)
- 201A, 202A
- stages of the fluid power equipment/steam turbine
- 203
- casing/turbine casing
- 203A
- machineable exhaust arrangement
- 203A'
- machined exhaust arrangement
- 203B
- groove(s)/diaphragm groove accommodating stages there-within
- 203C
- wall of the casing
- 203D
- face of the casing
- 401
- leakage prevention unit for fluid power equipment having less than or equal to 3 stages
- 402, 403
- leakage prevention units/exhaust casings/exhaust pipes for fluid power equipment having more than 3 stages
- 401A
- face of the
leakage prevention unit 401 - 402A
- face of the
leakage prevention unit 402 - 402B
- exhaust pipe of
leakage prevention unit 402 - 403A
- face of the
leakage prevention unit 403 - 403B
- exhaust pipe of
leakage prevention unit 403
Claims (10)
- A fluid power equipment (201, 202) having:- at least one stage (201A, 202A) comprising a plurality of blades and a plurality of nozzles;- a casing (203) accommodating the at least one stage (201A, 202A) there-within;characterized in that:- the casing (203) is configured to have a machineable exhaust arrangement (203A).
- The fluid power equipment (201, 202) according to claim 1, wherein the exhaust arrangement (203A) is machined based on a number of stages (201A, 202A) to be accommodated in the fluid power equipment (201, 202).
- The fluid power equipment (201, 202) according to any one of the claims 1 and 2, wherein the exhaust arrangement (203A) is configured based on one or more fluid dynamics parameters associated with a fluid used in the fluid power equipment (201, 202), wherein the fluid dynamics parameters comprise a pressure of the fluid, a velocity of the fluid, and a volumetric flow of the fluid.
- The fluid power equipment (201, 202) according to the claim 1, comprising a leakage prevention unit (401) disposable against one of the faces (203D) of the casing (203).
- The fluid power equipment (201, 202) according to the claim 4, wherein the leakage prevention unit (401) when disposed against the face (203D) of the casing (203), enables maximal flow of exhaust mass of the fluid power equipment (201, 202) via the machined exhaust arrangement (203A').
- The fluid power equipment (201, 202) according to any one of the claims 4 and 5, wherein one or more physical dimensions of the leakage prevention unit (401, 402, 403) are configured based on a number of stages (201A, 202A) to be accommodated in the fluid power equipment (201, 202).
- The fluid power equipment (201,202) according to any one of the previous claims is a steam turbine.
- A casing (203) of a fluid power equipment (201, 202) configurable to accommodate there-within at least one stage (201A, 202A) comprising a plurality of blades and a plurality of nozzles, the casing (203) characterized by a machineable exhaust arrangement (203A).
- The casing (203) according to the claim 8, wherein the exhaust arrangement (203A) is machined based on a number of stages (201A, 202A) to be accommodated in the casing (203).
- The casing (203) according to any one of the claims 8 and 9, wherein the exhaust arrangement (203A) is configured based on one or more fluid dynamics parameters associated with a fluid used in the fluid power equipment (201, 202), wherein the fluid dynamics parameters comprise a pressure of the fluid, a velocity of the fluid, and a volumetric flow of the fluid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19171955.8A EP3734025A1 (en) | 2019-04-30 | 2019-04-30 | Steam turbine with standardized casing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19171955.8A EP3734025A1 (en) | 2019-04-30 | 2019-04-30 | Steam turbine with standardized casing |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3734025A1 true EP3734025A1 (en) | 2020-11-04 |
Family
ID=66349360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19171955.8A Pending EP3734025A1 (en) | 2019-04-30 | 2019-04-30 | Steam turbine with standardized casing |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3734025A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4425352A1 (en) * | 1994-07-18 | 1996-01-25 | Abb Patent Gmbh | Steam turbine with turbine housing produced as casting |
DE19708273C1 (en) * | 1997-02-28 | 1998-04-30 | Siemens Ag | Industrial steam-turbine housing design |
WO2008023046A1 (en) * | 2006-08-25 | 2008-02-28 | Alstom Technology Ltd | Steam turbine designed to facilitate late modification for operation with power plant incorporating carbon capture facilities |
US20150252681A1 (en) * | 2014-03-05 | 2015-09-10 | General Electric Company | Modular turbomachine inner and outer casings with multi-stage steam extraction sites |
-
2019
- 2019-04-30 EP EP19171955.8A patent/EP3734025A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4425352A1 (en) * | 1994-07-18 | 1996-01-25 | Abb Patent Gmbh | Steam turbine with turbine housing produced as casting |
DE19708273C1 (en) * | 1997-02-28 | 1998-04-30 | Siemens Ag | Industrial steam-turbine housing design |
WO2008023046A1 (en) * | 2006-08-25 | 2008-02-28 | Alstom Technology Ltd | Steam turbine designed to facilitate late modification for operation with power plant incorporating carbon capture facilities |
US20150252681A1 (en) * | 2014-03-05 | 2015-09-10 | General Electric Company | Modular turbomachine inner and outer casings with multi-stage steam extraction sites |
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