JPH07293277A - Duct structure substance - Google Patents
Duct structure substanceInfo
- Publication number
- JPH07293277A JPH07293277A JP8448494A JP8448494A JPH07293277A JP H07293277 A JPH07293277 A JP H07293277A JP 8448494 A JP8448494 A JP 8448494A JP 8448494 A JP8448494 A JP 8448494A JP H07293277 A JPH07293277 A JP H07293277A
- Authority
- JP
- Japan
- Prior art keywords
- duct
- duct body
- vertical rib
- cone
- rigidity
- 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- Withdrawn
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンバインドプラント
のガスタービンと排ガスボイラーとを接続する排気ダク
ト等の高温ガス通路を形成するダクトを構造物に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure having a duct forming a high temperature gas passage such as an exhaust duct connecting a gas turbine of a combined plant and an exhaust gas boiler.
【０００２】[0002]
【従来の技術】コンバインドサイクルプラントは、ガス
タービンで発生する高温の排ガスを排ガスボイラーに導
いて熱回収して蒸気を発生させ、その蒸気で蒸気タービ
ンを回転させて発電し、プラント全体の熱効率を向上さ
せるようにしたプラントである。図３に従来のガスター
ビン出口側の丸形状ダクト構造物を示す。このダクト構
造物では、ダクト本体０１は薄板によって構成され、そ
の外面に補強リブ０２を取付けた構造となっている。2. Description of the Related Art A combined cycle plant guides high-temperature exhaust gas generated in a gas turbine to an exhaust gas boiler to recover heat to generate steam, and the steam is used to rotate a steam turbine to generate electric power to improve the thermal efficiency of the entire plant. It is a plant designed to improve. FIG. 3 shows a conventional circular duct structure on the gas turbine outlet side. In this duct structure, the duct main body 01 is made of a thin plate, and a reinforcing rib 02 is attached to the outer surface thereof.
【０００３】[0003]
【発明が解決しようとする課題】前記の図３に示す従来
のダクト構造物においては、高温排ガス０３に直接触れ
る薄板よりなるダクト本体０１はすぐ高温になるが、補
強リブ０２の外側の部分では温度上昇が遅い。従って、
図４中、点線で示すように、ダクト本体０１が熱膨張し
ようとするのを補強リブ０２が強く押さえ込むこととな
り、大きい熱応力が発生する。プラントの起動・停止に
当ってこの大きい熱応力が繰り返し作用することとな
り、補強リブの取付け部や薄板の溶接部にき裂が発生す
ることが懸念される。In the conventional duct structure shown in FIG. 3, the duct body 01, which is a thin plate that directly contacts the high temperature exhaust gas 03, immediately becomes hot, but at the outside of the reinforcing rib 02. The temperature rises slowly. Therefore,
As shown by the dotted line in FIG. 4, the reinforcing rib 02 strongly presses the duct main body 01 against thermal expansion, and a large thermal stress is generated. This large thermal stress is repeatedly applied when the plant is started and stopped, and there is a concern that cracks may occur at the attachment portions of the reinforcing ribs and the welded portions of the thin plates.
【０００４】本発明は、以上の問題点を解決することが
できるダクト構造物を提供しようとするものである。The present invention is intended to provide a duct structure capable of solving the above problems.
【０００５】[0005]
【課題を解決するための手段】本発明のダクト構造物
は、内部に高温ガスの通路を形成する円形断面のダクト
本体の外面に、前記ダクト本体の軸方向に直交する方向
に配置された垂直リブ部とその外側に配置され傾斜部を
もつコーン形状部とを組み合わせた補強リブの前記垂直
リブ部の内縁を接合した。SUMMARY OF THE INVENTION A duct structure of the present invention is a vertical structure which is arranged on the outer surface of a duct body having a circular cross section which forms a passage for hot gas therein, in a direction orthogonal to the axial direction of the duct body. The inner edge of the vertical rib portion of the reinforcing rib, which is a combination of the rib portion and the cone-shaped portion arranged on the outer side thereof and having the inclined portion, is joined.
【０００６】[0006]
【作用】本発明では、高温ガスの通路を形成するダクト
本体の外面に接合される補強リブを、ダクト本体の軸方
向に配置された垂直リブ部とその外側に設けられた傾斜
部をもつコーン形状部とを組み合わせて構成していて、
前記垂直リブ部の内縁をダクト本体の外面に接合してい
るために、次の作用を奏することができる。 （１）高温側のダクト本体と低温側の補強リブの温度差
による熱膨張差は、コーン形状部での曲げ変形である程
度吸収され、大きい熱応力の発生を防止することができ
る。 （２）また、ダクト本体内外の差圧に対する剛性は、ダ
クト本体の外面に接合された垂直リブ部で持たせること
ができる。 （３）ダクト構造物の自重に対する剛性は、ダクト本体
の円形の断面全体でみればよく、水平部近傍（ダクト本
体の軸まわりに時計の２〜４倍及び８〜１０時の位置）
の補強リブのコーン形状部の剛性が有効に働き、ダクト
本体を含むダクト構造物の形状を保持することができ
る。According to the present invention, the reinforcing rib joined to the outer surface of the duct body forming the passage for the hot gas is a cone having a vertical rib portion arranged in the axial direction of the duct body and an inclined portion provided on the outer side thereof. It is configured by combining with the shape part,
Since the inner edge of the vertical rib portion is joined to the outer surface of the duct body, the following effects can be obtained. (1) The difference in thermal expansion due to the temperature difference between the duct body on the high temperature side and the reinforcing rib on the low temperature side is absorbed to some extent by the bending deformation in the cone-shaped portion, and a large thermal stress can be prevented from occurring. (2) Further, the rigidity against the pressure difference between the inside and outside of the duct body can be provided by the vertical rib portion joined to the outer surface of the duct body. (3) The rigidity of the duct structure with respect to its own weight can be seen in the entire circular cross section of the duct body, near the horizontal portion (2 to 4 times the time around the axis of the duct body and the position at 8 to 10 o'clock).
The rigidity of the cone-shaped portion of the reinforcing rib effectively works, and the shape of the duct structure including the duct body can be maintained.
【０００７】[0007]
【実施例】本発明の一実施例を、図１及び図２によって
説明する。本実施例はコンバインサイクルプラントのガ
スタービン出口側の丸形の排気ダクト構造物に係るもの
で、このダクト構造物は、図１中矢印で示すガスタービ
ンからの高温排ガス３を排ガスボイラーに導く通路を形
成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The present embodiment relates to a round exhaust duct structure on the gas turbine outlet side of a combine cycle plant, and this duct structure is a passage for guiding the high temperature exhaust gas 3 from the gas turbine shown by an arrow in FIG. 1 to an exhaust gas boiler. Is formed.
【０００８】ダクト本体１は、金属の薄板を曲げ加工し
て溶接４を行うことによって、丸形断面をもち、かつ、
図１（ｂ）において左方へ行くに従って断面が増大する
截頭円錐形の形状を有している。このダクト本体１の外
面に複数の補強リブ２がダクト本体１の軸方向Ａ−Ａに
互いに間隔をおいて溶接４によって接合されている。The duct body 1 has a round cross section by bending a thin metal plate and performing welding 4, and
In FIG. 1B, the cross section has a frustoconical shape whose cross section increases toward the left. A plurality of reinforcing ribs 2 are joined to the outer surface of the duct body 1 by welding 4 at intervals in the axial direction AA of the duct body 1.
【０００９】各補強リブ２は、ダクト本体１と同様な材
料で形成されており、ダクト本体１の軸方向Ａ−Ａに直
交する方向に配置された環状の垂直リブ部６と同垂直リ
ブ部６の外側にあって垂直リブ部６の外縁に連接され図
１（ｂ）において右方に行くに従って拡がるように傾斜
したコーン形状部５を有しており、このコーン形状部５
は、ダクト本体１の軸方向Ａ−Ａに直交するように外方
へ延びる環状の外方部５ａ、前記外方部５ａの外端に取
付けられダクト本体１の軸方向Ａ−Ａに平行に配置され
た円筒部７を備えている。このように構成された複数の
補強リブ２の垂直リブ部６の内縁が溶接４によってダク
ト本体１の外面に接合されている。Each of the reinforcing ribs 2 is made of the same material as that of the duct body 1, and is the same as the annular vertical rib portion 6 arranged in a direction orthogonal to the axial direction AA of the duct body 1. 6 has a cone-shaped portion 5 which is connected to the outer edge of the vertical rib portion 6 and which is inclined so as to widen to the right in FIG. 1 (b).
Is an annular outer portion 5a extending outward so as to be orthogonal to the axial direction AA of the duct body 1, and is attached to the outer end of the outer portion 5a in parallel with the axial direction AA of the duct body 1. The cylindrical portion 7 is provided. The inner edges of the vertical rib portions 6 of the plurality of reinforcing ribs 2 thus configured are joined to the outer surface of the duct body 1 by welding 4.
【００１０】本実施例では、図１中矢印で示すように、
高温排ガス３が内部を流れる高温側のダクト本体１と低
温側の補強リブ２には温度差による熱膨張差が発生す
る。しかし、図２中点線で示すように、この熱膨張差
は、傾斜したコーン形状部５での曲げ変形によってある
程度吸収され、大きい熱応力の発生を防止することがで
きる。In this embodiment, as indicated by the arrow in FIG.
Due to the temperature difference, a difference in thermal expansion occurs between the duct body 1 on the high temperature side and the reinforcing rib 2 on the low temperature side in which the high temperature exhaust gas 3 flows. However, as shown by the dotted line in FIG. 2, this difference in thermal expansion is absorbed to some extent by the bending deformation in the inclined cone-shaped portion 5, and the occurrence of large thermal stress can be prevented.
【００１１】また、ダクト本体１の内外の差圧に対する
剛性は、ダクト本体１の外面に接合されダクト本体１の
軸方向Ａ−Ａに直交する垂直リブ部６で持たせることが
できる。The rigidity against the pressure difference between the inside and the outside of the duct body 1 can be provided by the vertical rib portion 6 which is joined to the outer surface of the duct body 1 and is orthogonal to the axial direction AA of the duct body 1.
【００１２】更に、ダクト構造物の自重に対する剛性
は、ダクト本体１の円形の断面全体でみればよく、水平
部近傍（ダクト本体１の軸まわりに時計の２〜４時及び
８〜１０時の位置）のコーン形状部５の剛性が有効に働
き、ダクト本体１を含むダクト構造物の形状を保持する
ことができる。Further, the rigidity of the duct structure with respect to its own weight may be seen in the entire circular cross section of the duct body 1, in the vicinity of the horizontal portion (around the axis of the duct body 1 at 2 to 4 o'clock and 8 to 10 o'clock of the clock). The rigidity of the cone-shaped portion 5 at the position) works effectively, and the shape of the duct structure including the duct body 1 can be maintained.
【００１３】[0013]
【発明の効果】本発明のダクト構造物は、ダクト本体の
軸方向に直交する方向に配置された垂直リブ部とその外
側に配置され傾斜部をもつコーン形状部とを組み合わせ
た補強リブの前記垂直リブ部の内縁を高温ガスの通路を
形成する円形断面のダクト本体の外面に接合しているの
で、ダクト本体と補強リブの熱膨張差をコーン形状で吸
収して大きい熱応力の発生を防止し、また、ダクト本体
内外の差圧に対する剛性とダクト構造物の自重に対する
剛性はそれぞれ垂直リブ部とコーン形状部によって持た
せることができ、これによって、熱応力の繰り返し作用
によるき裂の発生を防止すると共に剛性を高めることが
できる。The duct structure of the present invention has the above-mentioned reinforcing ribs in which a vertical rib portion arranged in a direction orthogonal to the axial direction of the duct main body and a cone-shaped portion having an inclined portion arranged outside thereof are combined. The inner edge of the vertical rib is joined to the outer surface of the duct main body with a circular cross section that forms a passage for high-temperature gas, so the thermal expansion difference between the duct main body and the reinforcing rib is absorbed by the cone shape to prevent large thermal stress from occurring. In addition, the rigidity against the pressure difference between the inside and outside of the duct body and the rigidity against the dead weight of the duct structure can be provided by the vertical rib portion and the cone-shaped portion, respectively, which prevents the occurrence of cracks due to repeated thermal stress. It is possible to prevent it and increase rigidity.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一実施例を示し、図１（ａ）はその斜
視図、図１（ｂ）はその縦断面図である。FIG. 1 shows an embodiment of the present invention, FIG. 1 (a) is a perspective view thereof, and FIG. 1 (b) is a longitudinal sectional view thereof.
【図２】同実施例の変形状態の説明図である。FIG. 2 is an explanatory diagram of a modified state of the same embodiment.
【図３】従来のコンバインドサイクルプラントのガスタ
ービン出口側のダクト構造物を示し、図３（ａ）はその
斜視図、図３（ｂ）はその縦断面図である。FIG. 3 shows a duct structure on the gas turbine outlet side of a conventional combined cycle plant, FIG. 3 (a) is a perspective view thereof, and FIG. 3 (b) is a longitudinal sectional view thereof.
【図４】前記図３に示すダクト構造物の変形状態の説明
図である。4 is an explanatory view of a deformed state of the duct structure shown in FIG.
１ ダクト本体 ２ 補強リブ ３ 高温排ガス ４ 溶接 ５ コーン形状部 ５ａ 外方部 ６ 垂直リブ部 ７ 円筒部 Ａ−Ａ ダクト本体の軸方向 1 Duct main body 2 Reinforcing rib 3 High temperature exhaust gas 4 Welding 5 Cone shaped part 5a Outer part 6 Vertical rib part 7 Cylindrical part AA Axial direction of duct main body
フロントページの続き (72)発明者 一柳 卓 兵庫県高砂市荒井町新浜二丁目８番25号 高菱エンジニアリング株式会社内Front Page Continuation (72) Inventor Taku Ichiyanagi 2-8-25 Niihama, Arai-cho, Takasago-shi, Hyogo Takahishi Engineering Co., Ltd.
Claims (1)
面のダクト本体の外面に、前記ダクト本体の軸方向に直
交する方向に配置された垂直リブ部とその外側に配置さ
れ傾斜部をもつコーン形状部とを組み合わせた補強リブ
の前記垂直リブ部の内縁を接合したことを特徴とするダ
クト構造物。1. A vertical rib portion, which is arranged in a direction orthogonal to the axial direction of the duct body, and a slant portion, which is arranged outside the duct, are formed on the outer surface of the duct body having a circular cross section which forms a passage for hot gas therein. A duct structure characterized in that an inner edge of the vertical rib portion of a reinforcing rib combined with a cone-shaped portion is joined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8448494A JPH07293277A (en) | 1994-04-22 | 1994-04-22 | Duct structure substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8448494A JPH07293277A (en) | 1994-04-22 | 1994-04-22 | Duct structure substance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07293277A true JPH07293277A (en) | 1995-11-07 |
Family
ID=13831933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8448494A Withdrawn JPH07293277A (en) | 1994-04-22 | 1994-04-22 | Duct structure substance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07293277A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006274839A (en) * | 2005-03-28 | 2006-10-12 | Toshiba Corp | Exhaust duct and combined cycle power generation plant |
| WO2009107438A1 (en) | 2008-02-27 | 2009-09-03 | 三菱重工業株式会社 | Connection structure of exhaust chamber, support structure of turbine, and gas turbine |
| JP2010127246A (en) * | 2008-11-28 | 2010-06-10 | Mitsubishi Heavy Ind Ltd | Exhaust duct |
| US7766731B2 (en) * | 2005-12-05 | 2010-08-03 | Man Diesel & Turbo Se | Exhaust gas chimney |
| JP2012255449A (en) * | 2012-09-24 | 2012-12-27 | Mitsubishi Heavy Ind Ltd | Exhaust duct |
| JP2018524520A (en) * | 2015-07-21 | 2018-08-30 | サフラン・エアクラフト・エンジンズ | Exhaust casing of turbine engine with improved service life |
-
1994
- 1994-04-22 JP JP8448494A patent/JPH07293277A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006274839A (en) * | 2005-03-28 | 2006-10-12 | Toshiba Corp | Exhaust duct and combined cycle power generation plant |
| US7766731B2 (en) * | 2005-12-05 | 2010-08-03 | Man Diesel & Turbo Se | Exhaust gas chimney |
| WO2009107438A1 (en) | 2008-02-27 | 2009-09-03 | 三菱重工業株式会社 | Connection structure of exhaust chamber, support structure of turbine, and gas turbine |
| US8800300B2 (en) | 2008-02-27 | 2014-08-12 | Mitsubishi Heavy Industries, Ltd. | Connection structure of exhaust chamber, support structure of turbine, and gas turbine |
| EP2863021A1 (en) | 2008-02-27 | 2015-04-22 | Mitsubishi Hitachi Power Systems, Ltd. | Support structure of a gas turbine |
| US9133769B2 (en) | 2008-02-27 | 2015-09-15 | Mitsubishi Hitachi Power Systems, Ltd. | Connection structure of exhaust chamber, support structure of turbine, and gas turbine |
| JP2010127246A (en) * | 2008-11-28 | 2010-06-10 | Mitsubishi Heavy Ind Ltd | Exhaust duct |
| JP2012255449A (en) * | 2012-09-24 | 2012-12-27 | Mitsubishi Heavy Ind Ltd | Exhaust duct |
| JP2018524520A (en) * | 2015-07-21 | 2018-08-30 | サフラン・エアクラフト・エンジンズ | Exhaust casing of turbine engine with improved service life |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010703 |