EP0858551B1 - Element de transition entre des elements constitutifs du canal de gaz brules d'une turbine a gaz - Google Patents

Element de transition entre des elements constitutifs du canal de gaz brules d'une turbine a gaz Download PDF

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Publication number
EP0858551B1
EP0858551B1 EP96945509A EP96945509A EP0858551B1 EP 0858551 B1 EP0858551 B1 EP 0858551B1 EP 96945509 A EP96945509 A EP 96945509A EP 96945509 A EP96945509 A EP 96945509A EP 0858551 B1 EP0858551 B1 EP 0858551B1
Authority
EP
European Patent Office
Prior art keywords
components
flue gas
transition
gas duct
gas 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.)
Expired - Lifetime
Application number
EP96945509A
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German (de)
English (en)
Other versions
EP0858551A2 (fr
Inventor
Siegfried BÄHR
Jens Rackow
Dirk Lorenz
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
Publication of EP0858551A2 publication Critical patent/EP0858551A2/fr
Application granted granted Critical
Publication of EP0858551B1 publication Critical patent/EP0858551B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01D25/30—Exhaust heads, chambers, or the like

Definitions

  • the invention relates to a transition element between Components of a flue gas duct, that of a gas turbine Power plant is downstream.
  • Gas turbines are used in many areas, particularly in Power plants, for driving generators or working machines used.
  • the energy content becomes one Fuel for generating the rotational movement of the turbine shaft used.
  • the result of burning the fuel Work equipment or hot gas is used in the Gas turbine relaxes and then one as exhaust gas or flue gas fed to the gas turbine connected flue gas duct.
  • the flue gas duct of the gas turbine usually comprises several interconnected components or duct sections. Depending on The design and type of use of the gas turbine are as components a diffuser, a compensator and / or other elements, such as e.g. a main chimney, a bypass chimney.
  • Each component is common in the operation of the gas turbine heated by the exhaust gas or flue gas flowing through them.
  • the flue gas cools down along the flue gas direction through heat exchange with the respective components from.
  • Structural parts heated to different temperature levels to each other leading to mechanical stresses between leads the components.
  • FR-A-2 469 563 is a downstream of a gas turbine Exhaust gas collector known, which is a thermal insulation element for insulation of internals against the flue gas heat.
  • the invention has for its object a transition element between the components of a flue gas duct of the above Specify the type that has a particularly long lifespan the components and thus the entire gas turbine system.
  • the transition element has a first heat insulation element, the Thickness for setting a constant temperature profile in along a transition area linearly from the location variable depends on the flue gas duct.
  • the invention is based on the consideration that for a long life of the components of the flue gas duct of the gas turbine abrupt jumps in temperature between neighboring components should be avoided. This is due to an im Area of transition between two components of the Flue gas channel slowly changing temperature profile achievable. Setting a suitable temperature profile can accordingly by a correspondingly modified heat insulation element be effected by its thickness as a function of Location variables along the flue gas duct varied.
  • the temperature profile For a particularly effective reduction of transient temperature loads of the components is one set temperature profile steadily. This could be the heat insulation be stepped. To set one particularly suitable for avoiding material tension However, the temperature profile should be a non-stepped Thermal insulation can be used. The thickness of the The thermal insulation element depends linearly on the location coordinates. Such a transition element is also special easy to manufacture.
  • the length of the Transition range preferably greater than the temperature decay length of the wall material of the components.
  • the temperature decay length is the physical parameter for description a local temperature change within a Materials.
  • a transient temperature load on the wall material Components is also reduced by expediently the scope of at least one of the components in at least one Part of the flue gas duct linear with the location variable varies. With a round cross section of the flue gas duct this section is thus conical. At a square cross section of the flue gas duct corresponds to the In contrast, part of the lateral surface of a truncated pyramid.
  • the transition element in the Transition area expediently a first heat insulation element as internal insulation and a second thermal insulation element as external insulation, whose thicknesses as a function of the location variables vary in opposite directions.
  • the advantages achieved with the invention are in particular in that by the varying thickness of the heat insulation element a temperature profile during operation of the gas turbine sets such that excessive material loads the components of the flue gas duct are avoided.
  • the sub-area in which the scope at least one of the components varies linearly with the location variable, are different from different thermal expansions Component resulting radial constraints can be compensated.
  • Figure 1 shows - as part of a power plant - one Gas turbine system 1 with one of the gas turbine 2 via one Flue gas duct 4 downstream waste heat boiler 6 for steam generation, e.g. for a steam turbine (not shown).
  • the Flue gas duct 4 comprises one as components or duct pieces Metal compensator 8, a diffuser 10, a bypass chimney 12 and a duct piece 14 opening into the waste heat boiler 6.
  • the speed of the axially emerging from the gas turbine 2 hot smoke gas RG is in the with the metal compensator 8 connected diffuser 10 reduced, so that the static Flue gas pressure rises. Because of the high outlet temperature of the hot smoke gas RG of about 500 to 600 ° C arise Thermal expansion compensated by the metal compensator 8 should be. At junctions between each two components 8 and 10, and 12 and 14 of the flue gas duct 4 also occur local and / or transient Temperature loads due to continuous cooling of the flue gas RG along one indicated by the arrow 24 Location coordinate x in the direction of the flue gas duct 4 on.
  • the flue gas duct 4 points at the connection points between two of the components 8, 10, 12, 14 each a transition element 30 and 30 'on, as in the Figures 2 and 3 are shown in detail.
  • the transition elements 30, 30 ' serve to connect two components 8 and 10 or 12 and 14 of the flue gas duct 4.
  • the transition element 30, 30 ' can also be part of one of the components 8, 10 and 12, 14, respectively.
  • Transition elements 30, 30 ' are also at other connection points provided for two channel pieces of the smoke channel 4.
  • the transition element 30 shown in Figure 2 comprises Setting a temperature profile along the location coordinates x a first heat insulation element during operation of the gas turbine 2 34, whose thickness d as a function of the location variable x decreases linearly in a transition region 36.
  • a steady temperature profile is a "Soft" temperature transition between components 8 and 10, and thereby a reduced voltage load of the Components 8 and 10 guaranteed.
  • the Transition element 30 To the transition from an internally insulated component 8 to To enable an externally insulated component 10, the Transition element 30 a second heat insulation element 40 on, whose thickness d 'runs counter to the position variable x to the thickness d of the first heat insulation element 34 varies.
  • the heat insulation element 34 'of the transition element 30' indicates the setting of an intended temperature profile one that varies as a function of the location coordinates x Thickness d.
  • the thickness d of the heat insulation element varies 34 'as a function of the location coordinates x also linear in a second region 42. Eddies of the the flue gas channel 4 flowing through flue gas duct RG and therefrom resulting flow losses are thus kept low.
  • the circumference of the outer wall 38 'of the transition element 30' opens in a flange 44 with a particularly small Flange height h. Such a low flange height h the flange 44 less sensitive to thermal expansion and thus has a particularly long lifespan.
  • the transition element 30 ′ also has one on the flange 44 connected tissue compensator 46, which with regard to temperature-induced tension is particularly flexible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Lift Valve (AREA)
  • Incineration Of Waste (AREA)

Claims (3)

  1. Elément (30, 30') de transition entre des éléments constitutifs (8, 10, 12, 14) d'un canal (4) de gaz d'échappement, qui est monté en aval d'une turbine (2) à gaz d'une centrale électrique, comprenant un premier élément (34, 34') d'isolation thermique dont l'épaisseur (d) dépend, pour l'établissement d'un profil de température constant dans une région (36, 36') de transition, linéairement d'une coordonnée (x) d'espace le long du canal (4) de gaz d'échappement.
  2. Elément de transition suivant la revendication 1,
       caractérisé en ce qu'au moins dans une partie (37), le pourtour d'au moins l'un des éléments constitutifs (8, 10, 12, 14), varie linéairement avec la variable (x) d'espace.
  3. Elément de transition pour un passage d'un élément constitutif (8) isolé intérieur à un élément constitutif (10) isolé extérieur suivant la revendication 1 ou 2,
       caractérisé en ce qu'un deuxième élément (40) d'isolation thermique est prévu en plus du premier élément (34) d'isolation thermique, les épaisseurs (d, d') des deux éléments (34, 40) d'isolation thermique variant en sens contraire dans la région (36) de transition.
EP96945509A 1995-10-31 1996-10-17 Element de transition entre des elements constitutifs du canal de gaz brules d'une turbine a gaz Expired - Lifetime EP0858551B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19540606 1995-10-31
DE19540606 1995-10-31
PCT/DE1996/001980 WO1997016628A2 (fr) 1995-10-31 1996-10-17 Element de transition entre des elements constitutifs du canal de gaz brules d'une turbine a gaz

Publications (2)

Publication Number Publication Date
EP0858551A2 EP0858551A2 (fr) 1998-08-19
EP0858551B1 true EP0858551B1 (fr) 2000-03-22

Family

ID=7776305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96945509A Expired - Lifetime EP0858551B1 (fr) 1995-10-31 1996-10-17 Element de transition entre des elements constitutifs du canal de gaz brules d'une turbine a gaz

Country Status (3)

Country Link
EP (1) EP0858551B1 (fr)
DE (1) DE59604798D1 (fr)
WO (1) WO1997016628A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378176A1 (fr) * 1977-01-19 1978-08-18 Bertin & Cie Conduit insonorise, en particulier pour echappement de moteurs thermiques
JPS5672206A (en) * 1979-11-14 1981-06-16 Nissan Motor Co Ltd Diffuser with collector
CS272676B1 (en) * 1988-06-07 1991-02-12 Stastny Miroslav Outlet branch for bladed machine

Also Published As

Publication number Publication date
WO1997016628A3 (fr) 1997-07-03
EP0858551A2 (fr) 1998-08-19
WO1997016628A2 (fr) 1997-05-09
DE59604798D1 (de) 2000-04-27

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