EP3098394A1 - Carter de turbine amélioré - Google Patents

Carter de turbine amélioré Download PDF

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Publication number
EP3098394A1
EP3098394A1 EP15169459.3A EP15169459A EP3098394A1 EP 3098394 A1 EP3098394 A1 EP 3098394A1 EP 15169459 A EP15169459 A EP 15169459A EP 3098394 A1 EP3098394 A1 EP 3098394A1
Authority
EP
European Patent Office
Prior art keywords
turbine
fluid
carrying chamber
fluid carrying
improved
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Withdrawn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
EP15169459.3A
Other languages
German (de)
English (en)
Inventor
Kuldeep Gupta
Sunil Kumar
Deepak Malik
Sachin Sharma
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP15169459.3A priority Critical patent/EP3098394A1/fr
Publication of EP3098394A1 publication Critical patent/EP3098394A1/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Withdrawn legal-status Critical Current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
    • F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
    • F01D19/02—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith dependent on temperature of component parts, e.g. of turbine-casing
    • 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
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/10—Heating, e.g. warming-up before starting
    • 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
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/14—Casings modified therefor
    • F01D25/145—Thermally insulated 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
    • 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
    • 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 improved turbines with high efficiency and more particularly, to improved steam turbines having reduced start-up, restart and shutdown duration.
  • a turbine is a well known mechanical device that extracts power from a flowing substance, like water, steam, wind etc., and converts it into a useable form of power.
  • turbines like steam turbines, gas turbines, water turbine, wind turbine, and so on. The turbines are further classified based on the turbine mechanical structure, casing type, operating principle and like.
  • Steam turbine is an important class of turbines.
  • the steam turbines extract energy from steam and convert it to mechanical energy.
  • the operation of the steam turbine in principle is, when high temperature and high pressure steam passes through a series of rotor blades of the steam turbine, the rotor blades absorb the energy from the steam and start rotating.
  • the shutdown and restart frequency for the steam turbine depends upon the type of maintenance and/or application.
  • the steam turbine shutdown and restart procedures are very time consuming thus the steam turbine unproductive time is directly proportional to the number of times the steam turbine shutdown and restart procedures. In other words, the steam turbine shutdown and restart procedures negatively affect the efficiency of the steam turbine.
  • it is required to reduce the time consumed during the steam turbine shutdown and restart procedures.
  • One simplest method of reducing the steam turbine start-up and/or restart duration is by increasing ramp rate of the turbine but high ramp rate leads to high thermal gradients across the turbine that induces high mechanical stress at various parts of the steam turbine. The high mechanical stress limits operational life of the steam turbine.
  • Another way of reducing the steam turbine start-up/restart time is performing a pre-warming procedure for valves and other internal components of the steam turbine by using hot but low pressure steam and after the pre-warming procedure the low pressure steam parameters are slowly ramped up to full load condition.
  • the ramp up rate of the steam parameters is restricted by a permissible level of thermal and/or pressure gradient for the steam turbine during start-up/restart procedure thus the pre-warming approach is also restricted and may negatively affect the operational life of the steam turbine.
  • the object is achieved by providing an improved turbine with shorten start-up, restart and shutdown duration according to claim 1.
  • an improved turbine in accordance to the disclosed aspect of the present invention, comprises at least one turbine casing and at least one fluid carrying chamber.
  • the at least one fluid carrying chamber encloses at least one part of the at least one turbine casing.
  • the at least one fluid carrying chamber may also encloses one or more sections of one or more components, other than the at least one turbine casing, of the improved turbine.
  • the at least one fluid carrying chamber comprises at least one fluid inlet pipe and at least one fluid exit pipe.
  • At least one fluid enters in the at least one fluid carrying chamber through the at least one fluid inlet pipe and the at least one fluid exit from the at least one fluid carrying chamber through the at least one fluid exit pipe.
  • the temperature of the at least one fluid is in accordance with the temperature of the at least one turbine casing. In other words, the temperature of the at least one fluid should be low if a turbine shutdown procedure is in progress and the temperature of the at least one fluid should be high if a turbine start-up or restart procedure is in progress.
  • the at least one fluid may include, but not limited to, water.
  • the improved turbine comprises at least one finned jacket wherein the at least one finned jacket comprises one or more fins.
  • the at least one finned jacket is placed in between one or more segments of the at least one turbine casing and the at least one fluid carrying chamber. It is preferred to place the at least one finned jacket in proximity of at least one steam inlet of the improved turbine that is in connection with the at least one turbine casing.
  • the improved turbine further comprises at least one insulating layer (210).
  • the at least one insulating layer completely or partially covers top surface of the at least one fluid carrying chamber.
  • the present invention provides an improved turbine with shorten start-up, restart and shutdown duration.
  • a turbine 100 with a fluid carrying chamber 110 is illustrated.
  • the turbine 100 also includes a turbine casing 102, a steam inlet 104, a steam exhaust 106 and a base 108.
  • the fluid carrying chamber 110 is placed on top of the turbine casing 102 in such way that the fluid carrying chamber 110 covers the turbine casing 102 completely, as illustrated in FIG 1 .
  • the fluid carrying chamber 110 also includes a fluid inlet pipe 114 and a fluid exit pipe 112, as shown in FIG 1 .
  • the fluid carrying chamber 110 carries hot water during start-up or restart duration.
  • the hot water flows in the fluid carrying chamber 110 through the fluid inlet pipe 114 and exits from the fluid exit pipe 112.
  • one or more pre-warming procedures for valves and other internal components, not shown in FIG 1 , of the turbine 100 are performed.
  • the one or more pre-warming procedures include blowing hot but low pressure steam inside the turbine 100 or any other method known in the state of the art. After initiating the pre-warming procedures, the low pressure steam parameters are slowly ramped up to full load condition and due to the pre-warming procedures the start-up or restart duration of the turbine 100 reduces significantly.
  • the invention suggests use of the fluid carrying chamber 110, having hot water and/or any other suitable fluid at a temperature in accordance with the temperature of the turbine 100 internal components during pre-warming procedures, over the turbine casing 102 for reducing the thermal and pressure gradients during pre-warming procedures which leads to a short start-up or restart duration of the turbine 100 without stressing the components of the turbine 100.
  • the fluid carrying chamber 110 carries cold water.
  • the cold water flows in the fluid carrying chamber 110 through the fluid inlet pipe 114 and exits from the fluid exit pipe 112.
  • air is blown over the internal components of the turbine 100 i.e. forced cooling along with the free cooling of the turbine 100 for reducing the shutdown duration, as suggested in the state of the art.
  • Due to the circulation of cold water in the fluid carrying chamber 110 through the fluid inlet pipe 114 and the fluid exit pipe 112 reduces the thermal gradients between the internal components and the outer section of the turbine 100 during force cooling procedure. Due to significant reduction in the thermal gradients the stress between the internal components and the outer section of the turbine 100 also reduces which leads to longer operational life of the turbine 100.
  • the invention suggests use of the fluid carrying chamber 110, having cold water and/or any other suitable fluid at a temperature in accordance with the temperature of the turbine 100 internal components during forced cooling procedure, over the turbine casing 102 for reducing the thermal gradients during forced cooling procedure which leads to a short shutdown duration of the turbine 100 without stressing the components of the turbine 100.
  • the fluid inlet pipe 114 and the fluid exit pipe 112 of the fluid carrying chamber 110 remains in closed position.
  • the thermal conductivity of the trapped water or fluid is very low hence it acts as an insulator i.e. it restricts the transfer of heat, through it, from the turbine casing 102 during normal operation.
  • the heat transfer from the turbine casing 102 to the fluid carrying chamber 110 can occur due to radiation.
  • a resistance is provided by applying an insulating layer 210 at the outer surface of the fluid carrying chamber 110 as illustrated in FIG 2 .
  • one or more seals 206A, 206B are provided at the boundaries of the turbine casing 102, as shown in FIG 2 , to minimise flow of heat from the turbine casing 102.
  • seals 206A, 206B are provided at the boundaries of the turbine casing 102, as shown in FIG 2 , to minimise flow of heat from the turbine casing 102.
  • the start-up, restarting and/or shutdown duration can further reduced by faster cooling/heating of a high temperature zone of the turbine 100, specifically in case of high pressure turbines.
  • Faster cooling/heating of a high temperature zone of the turbine 100 is achieved by increasing heat transfer area of the turbine casing 102 i.e. by increasing outer surface area of the turbine casing 102.
  • the outer surface area is increased by adding a finned jacket 202 close to the steam inlet 104 over the turbine casing 102, as shown in FIG 2 .
  • the finned jacket 202 has multiple parallel fins 204. For simplicity only one fin 204 of the finned jacket 202 is shown in the cross sectional view of the turbine 100 i.e. FIG 2 .
  • the finned jacket 202 is added all over the turbine casing 102. In another embodiment of the present invention, the finned jacket is added selective different sections of the turbine 100.
  • Rth is thermal resistance
  • h convective heat transfer coefficient
  • A heat transfer area
  • the invention provides an improved turbine having reduced start-up, restart and shutdown duration in comparison to the start-up, restart and shutdown duration of the turbine known in the state of the art.
EP15169459.3A 2015-05-27 2015-05-27 Carter de turbine amélioré Withdrawn EP3098394A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15169459.3A EP3098394A1 (fr) 2015-05-27 2015-05-27 Carter de turbine amélioré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15169459.3A EP3098394A1 (fr) 2015-05-27 2015-05-27 Carter de turbine amélioré

Publications (1)

Publication Number Publication Date
EP3098394A1 true EP3098394A1 (fr) 2016-11-30

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ID=53264568

Family Applications (1)

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EP15169459.3A Withdrawn EP3098394A1 (fr) 2015-05-27 2015-05-27 Carter de turbine amélioré

Country Status (1)

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EP (1) EP3098394A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109209528A (zh) * 2018-10-26 2019-01-15 中国船舶重工集团公司第七0三研究所 一种氦气轮机机匣结构

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB813330A (en) * 1956-04-25 1959-05-13 Rateau Soc Improvements in or relating to turbines
JPS60247001A (ja) * 1984-05-23 1985-12-06 Hitachi Ltd 蒸気タ−ビンケ−シングの熱応力制御装置
JP2008038807A (ja) * 2006-08-08 2008-02-21 Hitachi Ltd ガスタービン及びトランジションピース
EP2048367A1 (fr) * 2007-10-09 2009-04-15 Siemens Aktiengesellschaft Boîtier avec dispositif de refroidissement pour un turbocompresseur à gaz de processus
DE102008024335A1 (de) * 2008-05-20 2009-11-26 Frank Schuster Gasturbinentriebwerk in Nebenstromausführung
JP2012207657A (ja) * 2011-03-15 2012-10-25 Mitsubishi Heavy Ind Ltd タービン
US20120275900A1 (en) * 2011-04-27 2012-11-01 Snider Raymond G Method of forming a multi-panel outer wall of a component for use in a gas turbine engine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB813330A (en) * 1956-04-25 1959-05-13 Rateau Soc Improvements in or relating to turbines
JPS60247001A (ja) * 1984-05-23 1985-12-06 Hitachi Ltd 蒸気タ−ビンケ−シングの熱応力制御装置
JP2008038807A (ja) * 2006-08-08 2008-02-21 Hitachi Ltd ガスタービン及びトランジションピース
EP2048367A1 (fr) * 2007-10-09 2009-04-15 Siemens Aktiengesellschaft Boîtier avec dispositif de refroidissement pour un turbocompresseur à gaz de processus
DE102008024335A1 (de) * 2008-05-20 2009-11-26 Frank Schuster Gasturbinentriebwerk in Nebenstromausführung
JP2012207657A (ja) * 2011-03-15 2012-10-25 Mitsubishi Heavy Ind Ltd タービン
US20120275900A1 (en) * 2011-04-27 2012-11-01 Snider Raymond G Method of forming a multi-panel outer wall of a component for use in a gas turbine engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109209528A (zh) * 2018-10-26 2019-01-15 中国船舶重工集团公司第七0三研究所 一种氦气轮机机匣结构

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