JPS63282494A - Heat exchanger - Google Patents
Heat exchangerInfo
- Publication number
- JPS63282494A JPS63282494A JP62114666A JP11466687A JPS63282494A JP S63282494 A JPS63282494 A JP S63282494A JP 62114666 A JP62114666 A JP 62114666A JP 11466687 A JP11466687 A JP 11466687A JP S63282494 A JPS63282494 A JP S63282494A
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- sleeve
- outlet
- steam
- tube
- 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.)
- Granted
Links
- 238000004781 supercooling Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000008646 thermal stress Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000644 propagated effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010723 turbine oil Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、伝熱管内で加熱蒸気が凝縮する方式の熱交換
器に係り、特に、伝熱管出口の管端溶接部の凝縮水温度
変動に伴う疲労亀裂の問題を、解決した熱交換器に関す
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat exchanger in which heated steam is condensed within a heat exchanger tube, and in particular, the present invention relates to a heat exchanger in which heated steam is condensed within a heat exchanger tube. This relates to a heat exchanger that solves the problem of fatigue cracks associated with heat exchangers.
従来の装置は、特公昭５８−２５９２５号公報及びＵ
Ｓ Ｐ ３０７３５７５に記載のように、伝熱管の出入
口にオリフィスを設置し各伝熱管に流入する蒸気啜を変
化させ、凝縮水の過冷却温度を平均化したり、特開昭５
８−１５８４０２号公報に記載のように、ベント蒸気の
確保によって過冷却温度のレベルを下げるのみで、管端
溶接部には、尚凝縮水の過冷却に伴うくり返しの熱応力
が作用し、疲労亀裂の要因を取除くことはできなかった
。Conventional devices are disclosed in Japanese Patent Publication No. 58-25925 and U.
As described in S P 3073575, orifices are installed at the entrances and exits of heat exchanger tubes to change the amount of steam flowing into each heat exchanger tube, thereby averaging the supercooling temperature of condensed water.
As described in Publication No. 8-158402, even if the supercooling temperature level is simply lowered by securing vent steam, repeated thermal stress due to supercooling of the condensed water acts on the pipe end weld, causing fatigue. The cause of the cracks could not be removed.
上記従来技術は、過冷却凝縮水が管端溶接部に接して排
出されることに起因してくり返しの熱応力が発生する点
について考慮されておらず、過冷却温度の低下によって
も尚、き裂発生の要因があった。The above-mentioned conventional technology does not take into consideration the fact that repeated thermal stress occurs due to supercooled condensed water being discharged in contact with the pipe end weld, and even if the supercooling temperature decreases, thermal stress still occurs. There was a factor that caused the crack to occur.
本発明の目的は、伝熱管出口の管端溶接部にスリーブを
取付けることにより、過冷却凝縮水が直接管端溶接部に
接することのない構造とし、管端溶接部のき裂発生の問
題を解決した熱交換器を提供することにある。An object of the present invention is to provide a structure in which supercooled condensed water does not come into direct contact with the tube end weld by attaching a sleeve to the tube end weld at the outlet of the heat transfer tube, thereby solving the problem of cracking at the tube end weld. Our goal is to provide a heat exchanger that solves the problem.
上記目的は、伝熱管出口部に、管端溶接部を覆う形状の
スリーブを設置することにより達成される。The above object is achieved by installing a sleeve shaped to cover the tube end weld at the outlet of the heat exchanger tube.
伝熱管出口部に設置されるスリーブは管端溶接部を覆う
形状であり、凝縮ドレンはスリーブ上を流れ出口室に排
出される。それによって、過冷却凝縮水に起因する管出
口部での温度変動は、管端溶接部に伝わること力別なく
、従って、凝縮水の温。A sleeve installed at the outlet of the heat exchanger tube has a shape that covers the tube end weld, and condensed condensate flows over the sleeve and is discharged into the outlet chamber. As a result, temperature fluctuations at the tube outlet caused by supercooled condensed water are not transmitted to the tube end weld, thereby reducing the temperature of the condensed water.
度変動に伴う管端溶接部のき裂発生を皆無にできる。This completely eliminates the occurrence of cracks in pipe end welds due to temperature fluctuations.
以下に本発明の実施例を添付図を参考に説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
原子力発電プラン１へに使用される湿分分は加熱器を例
νことると、湿分分離加熱器は高圧タービン（図示せず
）と低圧タービン（図示せず）の間に位置し、第２図に
示すように、胴体１には高圧タービンからの蒸気８の入
口管２と加熱後の蒸気９の出口管３があり、胴体１の中
には、高圧タービンからの蒸気８中に含まれる湿分を除
去する湿分分離器４と湿分除去後の蒸気を加熱する加熱
器５を含む。湿分分離器４で分離された湿分１１はドレ
ン配管１０よりドレンタンク（図示せず）へ回収される
。加熱器５はＵ字形伝熱管６と伝熱管端を支持する管板
７、加熱蒸気の入口室１２と出口室１３から構成される
。加熱器５へは、原子炉（図示せず）からの発生蒸気、
あるいは、高圧タービン油気を加熱蒸気１４とし、加熱
蒸気１４は、加熱蒸気入口室１２より、伝熱管６を通り
高圧タービンからの蒸気８を加熱し、その過程で凝縮し
、出口室１３に至り、凝縮水１５はドレン配管１６へ、
未凝縮蒸気（ベント蒸気）１７はベント配管１８へ回収
され、給水加熱器（図示せず）へ導かれる。The moisture used for nuclear power generation plan 1 is stored in a heater, for example. The moisture separation heater is located between a high-pressure turbine (not shown) and a low-pressure turbine (not shown). As shown in Figure 2, the body 1 has an inlet pipe 2 for steam 8 from the high-pressure turbine and an outlet pipe 3 for heated steam 9. It includes a moisture separator 4 that removes moisture and a heater 5 that heats the steam after moisture removal. Moisture 11 separated by the moisture separator 4 is collected through a drain pipe 10 into a drain tank (not shown). The heater 5 is composed of a U-shaped heat exchanger tube 6, a tube plate 7 supporting the ends of the heat exchanger tube, an inlet chamber 12 and an outlet chamber 13 for heating steam. Steam generated from a nuclear reactor (not shown) is supplied to the heater 5.
Alternatively, the high-pressure turbine oil is used as heated steam 14, and the heated steam 14 passes through the heat exchanger tube 6 from the heated steam inlet chamber 12, heats the steam 8 from the high-pressure turbine, condenses in the process, and reaches the outlet chamber 13. , the condensed water 15 goes to the drain pipe 16,
Uncondensed steam (vent steam) 17 is collected into vent piping 18 and guided to a feed water heater (not shown).
伝熱管６の出口部１９は従来、第３図に示すように、伝
熱管６は管板７に溶接２０によって固定され振れ止めの
ために一部分が拡管２１される。Conventionally, as shown in FIG. 3, the outlet portion 19 of the heat exchanger tube 6 is fixed to a tube plate 7 by welding 20, and a portion thereof is expanded 21 for steadying.
伝熱管６の凝縮水１５は、理想的には管内圧力の飽和温
度となり、ベント蒸気１７と同一温度であるが実際には
、飽和温度よりも温度の低下する過冷却現象を程する。The condensed water 15 in the heat transfer tube 6 ideally has a saturation temperature of the tube internal pressure, which is the same temperature as the vent steam 17, but actually undergoes a supercooling phenomenon in which the temperature is lower than the saturation temperature.
この過冷却現象により管端溶接部２０にはくり返しの熱
応力が作用し、管端溶接部２０にき裂を生じる事故が報
告されている。Accidents have been reported in which repeated thermal stress acts on the tube end weld 20 due to this supercooling phenomenon, causing cracks in the tube end weld 20.
過冷却の度合を低減する方策は、加熱蒸気入口室１２の
伝熱管入口部に絞りオリフィスを設置して各伝熱管に流
入する蒸気量を調整する方法と、ベント蒸気１７の一定
量以上の確保によって過冷却が低減されることが知られ
ている。Measures to reduce the degree of supercooling include installing a throttle orifice at the inlet of the heat exchanger tubes in the heating steam inlet chamber 12 to adjust the amount of steam flowing into each heat exchanger tube, and ensuring that a certain amount or more of vent steam 17 is present. It is known that supercooling can be reduced by
しかし、この方策によっても過冷却を無にすることはで
きず、ベント蒸気１７の増大はプラントの性能の低下を
招くこととなる。However, even with this measure, supercooling cannot be eliminated, and an increase in vent steam 17 will lead to a decrease in plant performance.
本問題解決のための本発明の実施例を第１図により説明
する。An embodiment of the present invention for solving this problem will be explained with reference to FIG.
第１図は伝熱管の出口部１９を示し、伝熱管６は従来と
同じように管板７に溶接２０によって固定、支持され、
さ゛らに、スリーブ２０が、溶接部２０を覆う形で取付
けられる。スリーブ２０は蒸気上流側２３で伝熱管６に
固定され、出口部２４で管板７に固定され、管端の溶接
部２０とスリーブ２２の間に空間２５を形成する。FIG. 1 shows the outlet section 19 of the heat exchanger tube, in which the heat exchanger tube 6 is fixed and supported by welding 20 to the tube plate 7 in the same manner as in the past.
Additionally, a sleeve 20 is attached to cover the weld 20. The sleeve 20 is fixed to the heat transfer tube 6 at the steam upstream side 23 and to the tube plate 7 at the outlet section 24, forming a space 25 between the tube end weld 20 and the sleeve 22.
本実施例によれば、過冷却した凝冷水１５は、スリーブ
２２の上を流れ、凝冷水１５の温度変化は、溶接部２０
には、空間２５の効果によってほとんど伝わらない。According to this embodiment, the supercooled condensed water 15 flows over the sleeve 22, and the temperature change of the condensed water 15 is caused by the welding part 20.
Due to the effect of the space 25, almost no light is transmitted.
従って、溶接部２０には、き裂発生の原因となるくり返
しの熱応力は発生することなく信頼性の高い加熱器とす
ることができる。Therefore, repeated thermal stress that causes cracks does not occur in the welded portion 20, making it possible to provide a highly reliable heater.
加えて、管端溶接部２０の疲労強度の観点から確保して
いたベント蒸気１７の流量を減少させることも可能とな
り、プラント性能を向上させることができる。In addition, it is also possible to reduce the flow rate of the vent steam 17, which has been secured from the viewpoint of fatigue strength of the tube end welded portion 20, thereby improving plant performance.
本発明のスリーブは、特に凝縮水の過冷却が大となる位
置に選択的に取付けてもよい。The sleeve of the present invention may be selectively installed in a position where supercooling of the condensed water is particularly large.
例えば、Ｕ字形伝熱管を用いた加熱器は第４図に示すよ
うに、上側の管束２６が加熱蒸気１４の入口側となり、
下側の管束２７が凝縮水１５及びベント蒸気１７の出口
側となる。高圧タービン出口蒸気８は下側管束８の下側
から流入し加熱された蒸気９として低圧タービンに向か
う。管束の両側には、高圧タービンからの蒸気８が管束
２６゜２７内のみ通過するように側板２８が設置される
。For example, in a heater using U-shaped heat transfer tubes, the upper tube bundle 26 is on the inlet side of the heating steam 14, as shown in FIG.
The lower tube bundle 27 is the outlet side of the condensed water 15 and vent steam 17. High-pressure turbine outlet steam 8 flows from below the lower tube bundle 8 and heads as heated steam 9 to the low-pressure turbine. Side plates 28 are installed on both sides of the tube bundle in such a way that the steam 8 from the high-pressure turbine passes only through the tube bundles 26 and 27.
本構造において、上側管束２６の伝熱管入口部にオリフ
ィスを設置しないような加熱器では、外周側伝熱管２９
で過冷却が大となることが知られており、外周側伝熱管
２９のみにスリーブ２２を設置するものである。又、側
板２８近傍の伝熱管３０付近では、中央部に比して、高
圧タービン出口蒸気８の流速が速く、従って、過冷却も
大となることかあり、側板近傍の伝熱管３０にスリーブ
を設置する。In this structure, in a heater in which an orifice is not installed at the inlet portion of the heat exchanger tubes of the upper tube bundle 26, the outer heat exchanger tubes 29
It is known that supercooling becomes large in this case, so the sleeve 22 is installed only on the outer heat exchanger tube 29. Further, near the heat exchanger tubes 30 near the side plates 28, the flow velocity of the high-pressure turbine outlet steam 8 is faster than in the center, and therefore supercooling may be large. Install.
さらには、加熱器の種類及び、伝熱管入口構造等により
、過冷却の分布を形成するものでは、過冷却の大となる
位置にスリーブを取付ける。Furthermore, if the type of heater and the structure of the heat exchanger tube inlet form a distribution of supercooling, the sleeve is installed at a position where the supercooling is large.
この様に伝熱管出口に選択的にスリーブを取付けた場合
にも、機器の信頼性及びプラント性能の向上が図れる。Even when sleeves are selectively attached to the heat exchanger tube outlets in this manner, equipment reliability and plant performance can be improved.
本発明によれば、伝熱管出口部における過冷却凝縮水の
発生に伴う、管端溶接部に作用するくり返しの熱応力を
無くし、ベント蒸気量を低減することができる。According to the present invention, it is possible to eliminate repeated thermal stress acting on the tube end welded portion due to the generation of supercooled condensed water at the outlet of the heat transfer tube, and to reduce the amount of vent steam.
第１図は１本発明の一実施例の伝熱管出口の入る。
６・・・伝熱管、７・・・管板、１５・・・凝縮水、１
７・・・ベント蒸気、２０・・・溶接部、２１・・・拡
管部、２２・・スリーブ、２５・・・空間部。FIG. 1 shows an outlet of a heat exchanger tube according to an embodiment of the present invention. 6... Heat exchanger tube, 7... Tube sheet, 15... Condensed water, 1
7... Vent steam, 20... Welded part, 21... Expanded pipe part, 22... Sleeve, 25... Space part.
Claims (1)
には、蒸気の入口室と出口室を形成し胴側と隔離され、
前記圧力容器の胴体には蒸気の入口管と出口管を設け、
前記伝熱管内に加熱用蒸気を流し、前記胴体入口からの
蒸気を加熱し、熱交換を行う多管式熱交換器において、 前記加熱用蒸気の前記出口室の管出口部にスリーブを設
置したことを特徴とする熱交換器。 ２、前記伝熱管管群の外周側近傍にのみ管出口部に前記
スリーブを設置したことを特徴とする特許請求の範囲第
１項記載の熱交換器。 ３、前記伝熱管管群の外周側近傍と管群両側近傍にのみ
管出口部に前記スリーブを設置したことを特徴とする特
許請求の範囲第１項記載の熱交換器。 ４、過冷却一様化構造を供える前記伝熱管管群のうち、
過冷却の大なる伝熱管にのみ前記スリーブを取付けたこ
とを特徴とする特許請求の範囲第１項記載の熱交換器。[Claims] 1. A group of heat exchanger tubes is provided in the pressure vessel, and the group of heat exchanger tubes forms an inlet chamber and an outlet chamber for steam and is isolated from the shell side,
A steam inlet pipe and an outlet pipe are provided in the body of the pressure vessel,
In the multi-tube heat exchanger that flows heating steam into the heat transfer tubes, heats the steam coming from the body inlet, and performs heat exchange, a sleeve is installed at the pipe outlet part of the outlet chamber of the heating steam. A heat exchanger characterized by: 2. The heat exchanger according to claim 1, wherein the sleeve is installed at the tube outlet only near the outer circumferential side of the heat exchanger tube group. 3. The heat exchanger according to claim 1, wherein the sleeve is installed at the tube outlet portion only near the outer circumferential side of the heat exchanger tube group and near both sides of the tube group. 4. Of the heat exchanger tube group provided with a supercooling uniform structure,
2. The heat exchanger according to claim 1, wherein the sleeve is attached only to heat transfer tubes that are highly subcooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62114666A JPH0784989B2 (en) | 1987-05-13 | 1987-05-13 | Heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62114666A JPH0784989B2 (en) | 1987-05-13 | 1987-05-13 | Heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63282494A true JPS63282494A (en) | 1988-11-18 |
| JPH0784989B2 JPH0784989B2 (en) | 1995-09-13 |
Family
ID=14643547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62114666A Expired - Lifetime JPH0784989B2 (en) | 1987-05-13 | 1987-05-13 | Heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0784989B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006000885A (en) * | 2004-06-17 | 2006-01-05 | Matsushita Electric Ind Co Ltd | Welding structure and welding method of aluminum accumulator, and heat exchanger |
-
1987
- 1987-05-13 JP JP62114666A patent/JPH0784989B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006000885A (en) * | 2004-06-17 | 2006-01-05 | Matsushita Electric Ind Co Ltd | Welding structure and welding method of aluminum accumulator, and heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0784989B2 (en) | 1995-09-13 |
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