JP2008267744A - Heat transfer tube removing method for condenser - Google Patents

Heat transfer tube removing method for condenser Download PDF

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JP2008267744A
JP2008267744A JP2007114020A JP2007114020A JP2008267744A JP 2008267744 A JP2008267744 A JP 2008267744A JP 2007114020 A JP2007114020 A JP 2007114020A JP 2007114020 A JP2007114020 A JP 2007114020A JP 2008267744 A JP2008267744 A JP 2008267744A
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tube
heat transfer
transfer tube
condenser
heat
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JP4966082B2 (en
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Shunichi Goshima
俊一 五島
Yoshiyuki Matsuo
義行 松尾
Shuhei Kodama
修平 児玉
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Toshiba Corp
Toshiba Plant Systems and Services Corp
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Toshiba Corp
Toshiba Plant Systems and Services Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To carrying out heat transfer tube removing work for a condenser in a short period of time. <P>SOLUTION: A heat transfer tube removing method for the condenser 20 condensing exhaust steam or the like from a steam turbine 1 into water by exchanging heat with cooling water flowing in a heat transfer tube 8 and supporting both ends of the heat transfer tube 8 by an inlet side tube plate and an outlet side tube plate while supporting a part other than both the ends by a plurality of support plates 11 is provided for removing the heat transfer tube 8 in a state of holding the plurality of support plates 11 with a stay bolt 22 extending in the tube axis direction of the heat transfer tube 8 after removing the tube plates. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、復水器の伝熱管抜管工法に関する。   The present invention relates to a heat transfer tube extraction method for a condenser.

最近の動向として、発電プラントに対して、定格出力割れの改善、熱出力一定運転、メンテナンス費の削減、事故によるプラント停止の予防等が要求されており、その対策として、プラント性能向上や劣化更新を実施していく必要がある。   Recent trends are that power plants are required to improve rated output cracking, operate at a constant heat output, reduce maintenance costs, prevent plant outages due to accidents, etc. It is necessary to carry out.

このような発電プラントにおいて、タービン設備を構成する機器の中に復水器がある。この復水器は、一般に、蒸気タービンで仕事を終えたタービン排気蒸気を海水と熱交換することによって凝縮し、凝縮後の復水を再生（予熱）して例えば原子炉等の蒸気発生器に戻すものであり、この復水器の構成の一例を図７及び図８に示す。   In such a power plant, there is a condenser in the equipment constituting the turbine equipment. In general, this condenser condenses turbine exhaust steam that has finished work in a steam turbine by exchanging heat with seawater, and regenerates (preheats) the condensed condensate into a steam generator such as a nuclear reactor. An example of the configuration of this condenser is shown in FIGS.

復水器は、蒸気タービン１に接続する連絡胴体部２と，この連絡胴体部２に連通する本体胴体部３とを備えた構成になっている。   The condenser has a connecting body part 2 connected to the steam turbine 1 and a main body body part 3 communicating with the connecting body part 2.

連絡胴体部２は、蒸気タービン１からのタービン排気蒸気を本体胴体部３へ導くものである。この連絡胴体部２には、設置面積の有効活用を図るために、給水加熱器５や抽気管、復水管等の配管（図示せず）等が設置されている。   The connecting body 2 guides the turbine exhaust steam from the steam turbine 1 to the main body 3. The communication body 2 is provided with a feed water heater 5 and piping (not shown) such as a bleed pipe and a condensate pipe in order to effectively use the installation area.

一方、本体胴体部３は、両側に入口水室６と出口水室７を備えると共に、これらの入口水室６、出口水室７と本体胴体部３とをそれぞれ区画する入口側管板９、出口側管板１０を備える。これらの入口側管板９及び出口側管板１０は、複数本の伝熱管（細管）８の両端部を支持する。複数本の伝熱管８の両端部以外の中間部分は、複数枚の支え板１１によって支持される。   On the other hand, the main body body portion 3 includes an inlet water chamber 6 and an outlet water chamber 7 on both sides, and an inlet side tube plate 9 that partitions the inlet water chamber 6, the outlet water chamber 7 and the main body body portion 3, respectively. An outlet side tube sheet 10 is provided. The inlet side tube plate 9 and the outlet side tube plate 10 support both ends of a plurality of heat transfer tubes (thin tubes) 8. Intermediate portions other than both ends of the plurality of heat transfer tubes 8 are supported by a plurality of support plates 11.

本体胴体部３は、複数枚の支え板１１と複数本の伝熱管８を、群としてまとめて構成する管束１２を収容するとともに、タービン排気蒸気を凝縮することで生成される復水を溜めるためのホットウェル１３を底部に備えている。   The main body body portion 3 accommodates a bundle of tubes 12 that collectively constitute a plurality of support plates 11 and a plurality of heat transfer tubes 8 as a group, and stores condensate generated by condensing turbine exhaust steam. The hot well 13 is provided at the bottom.

このような構成を備えた復水器は、蒸気タービン１から流出したタービン排気蒸気を連絡胴体部２内で圧力を回復させ、本体胴体部３の管束１２で熱交換して凝縮させた後、復水としてホットウェル１３に集める。管束１２を構成する伝熱管８内には、例えば海水などの冷却水が入口水室６から出口水室７へ向かって流れている。   The condenser having such a configuration recovers the pressure of the turbine exhaust steam that has flowed out of the steam turbine 1 in the communication body portion 2, exchanges heat with the tube bundle 12 of the body body portion 3, and condenses the steam. Collect in hot well 13 as condensate. In the heat transfer tubes 8 constituting the tube bundle 12, for example, cooling water such as seawater flows from the inlet water chamber 6 toward the outlet water chamber 7.

ところで、一般に、復水器の伝熱管８としてはアルミニウム黄銅管が採用されているが、この場合、海水に対する耐食性が低いので、メンテナンスが大変であり、海水漏えいに対する信頼性が劣り、復水器真空度が低下する等の問題点がある。このため、伝熱管８として、海水腐食に対して優れたチタン管を採用することにより、メンテナンス性及び信頼性を向上させ、更に、復水器真空度を改善してタービンの熱落差を大きくし、出力を増大（性能向上）させたいという要求がある。この要求を満たすために、チタン製の伝熱管８に取り替える作業が必要となる。   By the way, in general, an aluminum brass pipe is adopted as the heat transfer pipe 8 of the condenser. However, in this case, since the corrosion resistance to seawater is low, the maintenance is difficult, and the reliability against seawater leakage is inferior. There is a problem that the degree of vacuum is lowered. For this reason, by adopting a titanium pipe that is excellent against seawater corrosion as the heat transfer pipe 8, it improves the maintainability and reliability, and further improves the condenser vacuum and increases the heat drop of the turbine. There is a demand to increase output (performance improvement). In order to satisfy this requirement, it is necessary to replace the heat transfer tube 8 with titanium.

伝熱管８の取替工法においては、作業者の労力を低減し、かつ簡易・簡素にして短期に据付作業を実施できる復水器の据付工法が望まれており、例えば特許文献１に記載のように、新規の管束１２を有する管束構造体を分割等して搬入し、据え付ける復水器の据付工法が提案されている。そして更に、伝熱管８、支え板１１、入口側管板９、出口側管板１０等の内部構造物の撤去作業において、伝熱管８の撤去を効率的に行うことが重要となる。   In the replacement method of the heat transfer tube 8, there is a demand for a condenser installation method that can reduce the labor of the worker and that can be simplified and simplified and can be installed in a short period of time. As described above, there has been proposed an installation method for a condenser in which a tube bundle structure having a new tube bundle 12 is divided and carried in. Furthermore, in the removal work of the internal structures such as the heat transfer tube 8, the support plate 11, the inlet side tube plate 9, and the outlet side tube plate 10, it is important to efficiently remove the heat transfer tube 8.

ここで、発電プラントの復水器におけるアルミニウム黄銅管製の伝熱管８を撤去する従来の撤去工法を図９に示す。伝熱管８を撤去するためには、最初に、図８に示す入口側管板９及び出口側管板１０を撤去しなければならない。   Here, the conventional removal construction method which removes the heat exchanger tube 8 made from the aluminum brass tube in the condenser of a power plant is shown in FIG. In order to remove the heat transfer tube 8, first, the inlet side tube plate 9 and the outlet side tube plate 10 shown in FIG. 8 must be removed.

図８において、まず、入口水室６と出口水室７を移動台車（不図示）に載せて固定し、入口水室６及び出口水室７内で切断治具（不図示）を伝熱管８に挿入し、伝熱管８を内側から１本１本切断することにより、入口水室６、出口水室７と伝熱管８とを分離させる。   In FIG. 8, first, the inlet water chamber 6 and the outlet water chamber 7 are mounted and fixed on a movable carriage (not shown), and a cutting jig (not shown) is placed in the heat transfer tube 8 in the inlet water chamber 6 and the outlet water chamber 7. The inlet water chamber 6, the outlet water chamber 7 and the heat transfer tube 8 are separated by cutting the heat transfer tubes 8 one by one from the inside.

次に、移動台車に載せた入口水室６及び出口水室７を移動させて復水器本体から取り外し、入口側管板９及び出口側管板１０を露出させてから、各管板９、１０を適当な大きさに切断して撤去し、伝熱管８を露出させる。   Next, the inlet water chamber 6 and the outlet water chamber 7 placed on the moving carriage are moved and removed from the condenser main body, the inlet side tube plate 9 and the outlet side tube plate 10 are exposed, and then each tube plate 9, 10 is cut into an appropriate size and removed to expose the heat transfer tube 8.

管板９、１０を撤去した後、図９に示すように、抜管作業者１４が伝熱管８を１本１本引き抜いて抜管する。伝熱管８は、最終的にキャスク１６に収納されて屋外に搬出されるため、このキャスク１６の大きさに応じて、切断作業者１５により切断治具１７を用いて切断される。
特開２００２−２８６３７８号公報 After removing the tube sheets 9 and 10, as shown in FIG. 9, the tube extraction operator 14 pulls out the heat transfer tubes 8 one by one and discharges them. Since the heat transfer tube 8 is finally stored in the cask 16 and carried out outdoors, the cutting operator 15 uses the cutting jig 17 to cut the heat transfer tube 8 according to the size of the cask 16.
JP 2002-286378 A

復水器における伝熱管８の撤去工法は、上述の如く、抜管作業者１４が伝熱管８を１本１本抜管する工法である。この伝熱管撤去工法を採用する場合、抜管作業者１４が伝熱管８を１本１本引き抜く過程で、伝熱管８を計画通りに引き抜き難いことが多々あるため、抜管作業者１４の人数と工期が当初の計画よりも大幅に増加するという課題がある。   The removal method of the heat transfer tubes 8 in the condenser is a method in which the tube extraction operator 14 extracts the heat transfer tubes 8 one by one as described above. When this heat transfer tube removal method is adopted, it is often difficult for the tube extraction operator 14 to pull out the heat transfer tubes 8 one by one, so it is often difficult to extract the heat transfer tubes 8 as planned. However, there is a problem that it will increase significantly from the original plan.

また、伝熱管８を引き抜き難いことから、この伝熱管８を復水器内で切断しなければならない。この結果、切断作業者１５の人数や工期が増加し、この影響で、復水器内での足場１９の設置と撤去、伝熱管８の両端の養生、復水器外への伝熱管８の搬出等をそれぞれ実施するための作業員と工期が増加するという課題も生ずる。   Moreover, since it is difficult to pull out the heat transfer tube 8, the heat transfer tube 8 must be cut in the condenser. As a result, the number of workers 15 and the construction period of the cutting worker 15 are increased. Due to this influence, the installation and removal of the scaffold 19 in the condenser, the curing of both ends of the heat transfer pipe 8, and the heat transfer pipe 8 outside the condenser are installed. There also arises a problem that the number of workers and work periods for carrying out unloading and the like increase.

本発明の目的は、上述の事情を考慮してなされたものであり、復水器の伝熱管の抜管工事を短期間に実施できる復水器の伝熱管抜管工法を提供することにある。   An object of the present invention is made in consideration of the above-described circumstances, and is to provide a heat transfer tube extruding method for a condenser that can perform heat pipe extraction work for the condenser in a short time.

本発明は、蒸気タ−ビンからの排気蒸気等を、伝熱管を流れる冷却水により熱交換して復水とし、前記伝熱管の両端部が管板により、両端部以外の部分が複数枚の支え板により支持された復水器の伝熱管抜管工法において、前記管板を撤去した後、複数枚の前記支え板を、前記伝熱管の管軸方向に延びる保持部材により保持した状態で、当該伝熱管を抜管することを特徴とするものである。   In the present invention, exhaust steam or the like from a steam turbine is subjected to heat exchange with cooling water flowing through a heat transfer tube to form condensate, and both ends of the heat transfer tube are tube plates, and a portion other than both ends is a plurality of sheets. In the heat transfer tube extraction method for a condenser supported by a support plate, after removing the tube plate, the plurality of support plates are held by a holding member extending in the tube axis direction of the heat transfer tube. The heat transfer tube is extracted.

本発明によれば、伝熱管を複数枚の支え板から引き抜く抜管作業を容易化できるので、作業員を低減できると共に、工期を短縮できる。   According to the present invention, it is possible to facilitate the tube extraction work of pulling out the heat transfer tubes from a plurality of support plates, so that it is possible to reduce the number of workers and shorten the construction period.

以下、本発明を実施するための最良の形態を、図面に基づき説明する。但し、本発明は、これらの実施の形態に限定されるものではない。   The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to these embodiments.

［Ａ］第１の実施の形態（図１、図７、図８）
図１は、本発明に係る復水器の伝熱管抜管工法における第１の実施の形態を実施している復水器を示す側面断面図である。本実施形態における復水器２０は、図７及び図８に示す従来の復水器と同様な構成であり、従って、同一部分には同一の符号を付すと共に、重複説明や主要部以外の説明を省略する。 [A] First embodiment (FIGS. 1, 7, and 8)
FIG. 1 is a side cross-sectional view showing a condenser in which a first embodiment of a heat transfer pipe extracting method for a condenser according to the present invention is implemented. The condenser 20 in the present embodiment has the same configuration as that of the conventional condenser shown in FIGS. 7 and 8, and therefore, the same parts are denoted by the same reference numerals, and redundant explanations and explanations other than the main parts are provided. Is omitted.

復水器２０は、図１、図７及び図８に示すように、蒸気タービン１に接続された連絡胴体部２と、この連絡胴体部２に連通する本体胴体部３とを有して構成され、蒸気タービン１からの排気蒸気やその他の流体が連絡胴体部２を経て本体胴体部３へ導かれる。この本体胴体部３には、外側に入口水室６、出口水室７が対向して配置されると共に、内側に複数本の伝熱管８が、入口水室６から出口水室７へ延在して配置されている。入口水室６には海水等の冷却水が供給され、この冷却水は、伝熱管８内を流れる間に前記排気蒸気等と熱交換し、この排気蒸気等を凝縮して復水とした後、出口水室７を経て排出される。   As shown in FIGS. 1, 7, and 8, the condenser 20 includes a connecting body portion 2 connected to the steam turbine 1 and a main body body portion 3 communicating with the connecting body portion 2. Then, exhaust steam and other fluids from the steam turbine 1 are guided to the main body body 3 through the communication body 2. In the main body body portion 3, an inlet water chamber 6 and an outlet water chamber 7 are arranged opposite to each other, and a plurality of heat transfer tubes 8 extend from the inlet water chamber 6 to the outlet water chamber 7 on the inner side. Are arranged. Cooling water such as seawater is supplied to the inlet water chamber 6, and this cooling water exchanges heat with the exhaust steam and the like while flowing through the heat transfer pipe 8, and condenses the exhaust steam and the like into condensate. The water is discharged through the outlet water chamber 7.

複数本の伝熱管８の管配列の断面は例えばＵ字形状であり（図７参照）、これらの伝熱管８の両端部が入口側管板９、出口側管板１０によりそれぞれ支持される。入口側管板９は、本体胴体部３と入口水室６とを区画し、また、出口側管板１０は、本体胴体部３と出口水室７とを区画する機能を有する。複数本の伝熱管８の両端部以外の部分は、伝熱管８の管軸方向に所定間隔で配列された複数枚の支え板１１により支持される。   The cross section of the tube arrangement of the plurality of heat transfer tubes 8 is, for example, U-shaped (see FIG. 7), and both ends of these heat transfer tubes 8 are supported by the inlet side tube plate 9 and the outlet side tube plate 10, respectively. The inlet side tube sheet 9 partitions the main body body part 3 and the inlet water chamber 6, and the outlet side tube sheet 10 has a function of partitioning the main body body part 3 and the outlet water chamber 7. Portions other than both end portions of the plurality of heat transfer tubes 8 are supported by a plurality of support plates 11 arranged at predetermined intervals in the tube axis direction of the heat transfer tubes 8.

これらの支え板１１によって、自重による伝熱管８の過大な撓みが防止されると共に、排気蒸気等による伝熱管８の過大な振動が防止される。これら複数本の伝熱管８及び複数枚の支え板１１が群としてまとめられて、管束１２が構成される。更に、この管束１２に入口側管板９及び出口側管板１０を含めて、管束モジュール２１（図８参照）が構成される。   These support plates 11 prevent excessive deflection of the heat transfer tube 8 due to its own weight, and also prevents excessive vibration of the heat transfer tube 8 due to exhaust steam or the like. The plurality of heat transfer tubes 8 and the plurality of support plates 11 are grouped to form a tube bundle 12. Further, the tube bundle module 21 (see FIG. 8) is configured by including the inlet side tube plate 9 and the outlet side tube plate 10 in the tube bundle 12.

さて、上述のように構成された復水器２０において、伝熱管８を取り替えるための既設の伝熱管８の抜管工事は、まず入口水室６及び出口水室７を取り除き、次に、入口側管板９及び入口側管板１０を撤去した後に実施する。図１は、入口側管板９及び出口側管板１０を撤去した段階の復水器２０を示す。   Now, in the condenser 20 configured as described above, the existing heat transfer tube 8 for exchanging the heat transfer tube 8 is removed by first removing the inlet water chamber 6 and the outlet water chamber 7, and then the inlet side. This is carried out after removing the tube plate 9 and the inlet side tube plate 10. FIG. 1 shows the condenser 20 at a stage where the inlet side tube sheet 9 and the outlet side tube sheet 10 have been removed.

つまり、入口側管板９及び出口側管板１０を撤去した後、複数枚の支え板１１から数本の伝熱管８を、図９に示すように、その管軸方向に引き抜いて抜管する。次に、数本の伝熱管８が抜き取られて形成された支え板１１の各穴（不図示）に、保持部材としてのステーボルト２２をそれぞれ挿通する。そして、これらのステーボルト２２の両端部を、複数枚の支え板１１のうち最も外側に配置された支え板１１Ａ及び１１Ｂにナットなどを用いて固定する。これにより、複数枚の支え板１１は、伝熱管８の管軸方向に延在するステーボルト２２によって保持され、伝熱管８の引き抜きによる抜管時に変形したり、傾斜することが防止される。   That is, after removing the inlet side tube plate 9 and the outlet side tube plate 10, several heat transfer tubes 8 are pulled out from the plurality of support plates 11 in the tube axis direction as shown in FIG. Next, a stay bolt 22 as a holding member is inserted into each hole (not shown) of the support plate 11 formed by extracting several heat transfer tubes 8. Then, both end portions of these stay bolts 22 are fixed to the support plates 11A and 11B arranged on the outermost side among the plurality of support plates 11 using nuts or the like. Thus, the plurality of support plates 11 are held by the stay bolts 22 extending in the tube axis direction of the heat transfer tube 8, and are prevented from being deformed or inclined when the heat transfer tube 8 is pulled out.

尚、ステーボルト２２は支え板１１と同一材質であり、例えば耐候性に富む炭素鋼が用いられる。また、伝熱管８は、例えばチタン材質にて構成されている。   The stay bolt 22 is made of the same material as the support plate 11 and is made of, for example, carbon steel rich in weather resistance. The heat transfer tube 8 is made of, for example, a titanium material.

以上のように構成されたことから、本実施の形態によれば、次の効果（１）を奏する。   With the configuration as described above, the present embodiment has the following effect (1).

（１）伝熱管８の両端部が入口側管板９及び出口側管板１０により、両端部以外の部分が複数枚の支え板１１により支持され、この伝熱管８の抜管工法では、入口側管板９及び出口側管板１０を撤去した後、複数枚の支え板１１を、伝熱管８の管軸方向に延びるステーボルト２２により保持した状態で当該伝熱管８を抜管する。このことから、伝熱管８の抜管時にステーボルト２２によって、複数枚の支え板１１が変形したり、傾斜することを防止できる。このため、伝熱管８を複数枚の支え板１１から引き抜く抜管作業を容易化できるので、作業員を低減できると共に、工期を短縮できる。   (1) Both end portions of the heat transfer tube 8 are supported by the inlet side tube plate 9 and the outlet side tube plate 10, and portions other than the both end portions are supported by a plurality of support plates 11. After removing the tube plate 9 and the outlet side tube plate 10, the heat transfer tube 8 is withdrawn in a state where the plurality of support plates 11 are held by the stay bolts 22 extending in the tube axis direction of the heat transfer tube 8. From this, it is possible to prevent the support plates 11 from being deformed or inclined by the stay bolts 22 when the heat transfer tube 8 is extracted. For this reason, since the tube extraction operation | work which draws out the heat exchanger tube 8 from the several support plate 11 can be facilitated, an operator can be reduced and a construction period can be shortened.

［Ｂ］第２の実施の形態（図２、図３）
図２は、本発明に係る復水器の伝熱管抜管工法における第２の実施の形態を実施している復水器を示す正面断面図である。図３は、図２の復水器の側面断面図である。本実施の形態において、前記第１の実施の形態及び従来技術と同様な部分は、同一の符号を付すことにより説明を省略する。 [B] Second embodiment (FIGS. 2 and 3)
FIG. 2 is a front cross-sectional view showing a condenser in which a second embodiment of the heat transfer pipe extracting method for the condenser according to the present invention is implemented. 3 is a side cross-sectional view of the condenser of FIG. In the present embodiment, the same parts as those in the first embodiment and the prior art are denoted by the same reference numerals, and the description thereof is omitted.

復水器２０では、前記第１の実施の形態において説明しなかったが、複数枚の支え板１１のそれぞれは支柱２３を介して本体胴体部３の底板２４に支持されると共に、繋ぎ板２５を介して本体胴体部３の側壁板２６に固定されている。更に、支え板１１は、本体胴体部３内で水平方向に隣り合って配置されたもの同士が連結板２７により互いに連結されている。   In the condenser 20, although not described in the first embodiment, each of the plurality of support plates 11 is supported by the bottom plate 24 of the main body body portion 3 via the support column 23 and the connecting plate 25. It is being fixed to the side wall board 26 of the main body trunk | drum 3 via. Further, the support plates 11 arranged adjacent to each other in the horizontal direction in the main body body portion 3 are connected to each other by a connecting plate 27.

ところで、本実施の形態の伝熱管８の抜管工法は、入口水室６及び出口水室７を取り除き、入口側管板９及び出口側管板１０を撤去した後に以下の如く実施する。尚、図２及び図３は、入口側管板９及び出口側管板１０を撤去した段階の復水器２０を示す。   By the way, the method for extracting the heat transfer tube 8 of the present embodiment is performed as follows after removing the inlet water chamber 6 and the outlet water chamber 7 and removing the inlet side tube plate 9 and the outlet side tube plate 10. 2 and 3 show the condenser 20 at a stage where the inlet side tube sheet 9 and the outlet side tube sheet 10 have been removed.

つまり、入口側管板９及び出口側管板１０を撤去後、まず、複数枚の支え板１１の下方に、伝熱管８の管軸方向に延びるレール２８を敷設し、このレール２８によっても支え板１１の荷重を支持する。次に、支柱２３、繋ぎ板２５及び連結板２７を撤去して、支え板１１及び伝熱管８（即ち管束１２）を本体胴体部３の底板２４及び側壁板２６から分離させる。   That is, after removing the inlet side tube plate 9 and the outlet side tube plate 10, first, a rail 28 extending in the tube axis direction of the heat transfer tube 8 is laid below the plurality of support plates 11, and is also supported by this rail 28. The load of the plate 11 is supported. Next, the support 23, the connecting plate 25, and the connecting plate 27 are removed, and the support plate 11 and the heat transfer tube 8 (that is, the tube bundle 12) are separated from the bottom plate 24 and the side wall plate 26 of the main body body portion 3.

その後、図示しないチェーンブロック等を用いて管束１２を伝熱管８の管軸方向に引っ張り、この管束１２をレール２８上にスライドさせて、当該レール２８に沿って復水器２０外へ搬出させる。このとき、管束１２の全体を一体として引っ張ってもよく、或いは伝熱管８の管軸方向に直交する切断面Ａで管束１２を切断して当該管束１２を上記管軸方向に分割し、各分割部分を順次復水器２０外へ搬出させてもよい。そして、復水器２０外で、伝熱管８を支え板１１から抜管する。   Thereafter, the tube bundle 12 is pulled in the direction of the tube axis of the heat transfer tube 8 using a chain block or the like (not shown), and the tube bundle 12 is slid onto the rail 28 and carried out of the condenser 20 along the rail 28. At this time, the entire tube bundle 12 may be pulled as a whole, or the tube bundle 12 is cut at a cutting surface A orthogonal to the tube axis direction of the heat transfer tube 8 to divide the tube bundle 12 in the tube axis direction, and The portions may be sequentially carried out of the condenser 20. Then, the heat transfer tube 8 is extracted from the support plate 11 outside the condenser 20.

尚、レール２８を敷設する前または後に、第１実施の形態と同様にして、複数枚の支え板１１から数本の伝熱管８を抜管し、この伝熱管８が抜管されて形成された穴のそれぞれにステーボルト２２を挿入し、これら伝熱管８の管軸方向に延在するステーボルト２２により複数枚の支え板１１を保持してもよい。   Before or after laying the rails 28, as in the first embodiment, several heat transfer tubes 8 are extracted from the plurality of support plates 11, and holes formed by extracting the heat transfer tubes 8 are extracted. A plurality of support plates 11 may be held by stay bolts 22 that extend in the tube axis direction of these heat transfer tubes 8.

以上のように構成されたことから、本実施の形態によれば、次の効果（２）及び（３）を奏する。   With the configuration as described above, according to the present embodiment, the following effects (2) and (3) are achieved.

（２）入口側管板９及び出口側管板１０を撤去した後、伝熱管８の下方にレール２８を敷設し、管束１２（複数の伝熱管８及び支え板１１）の全体を一体として、或いは管束１２を伝熱管８の管軸方向に分割して、レール２８に沿って復水器２０外まで搬出させる。このことから、伝熱管８が支え板１１から抜け難い場合に、作業効率の低い復水器２０内で、伝熱管８の抜管作業や切断作業を実施する必要がなく、これらの作業を復水器２０外で効率良く実施できる。この結果、伝熱管８の抜管作業の作業員を大幅に低減でき、且つ工期を短縮できる。   (2) After removing the inlet side tube plate 9 and the outlet side tube plate 10, the rail 28 is laid under the heat transfer tube 8, and the entire tube bundle 12 (the plurality of heat transfer tubes 8 and the support plate 11) is integrated. Alternatively, the tube bundle 12 is divided in the tube axis direction of the heat transfer tube 8 and is carried out of the condenser 20 along the rail 28. Therefore, when it is difficult to remove the heat transfer tube 8 from the support plate 11, it is not necessary to carry out the work of extracting or cutting the heat transfer tube 8 in the condenser 20 with low work efficiency. It can be carried out efficiently outside the vessel 20. As a result, the number of workers for extracting the heat transfer tubes 8 can be greatly reduced, and the work period can be shortened.

（３）複数枚の支え板１１をステーボルト２２を用いて保持した状態で、このステーボルト２２を含む管束１２を、レール２８上でスライドさせて復水器２０外へ搬出する場合には、このステーボルト２２が補強部材となって管束１２の強度が向上し、管束１２の搬出に際し、この管束１２の変形等を防止できる。更に、復水器２０外での伝熱管８の抜管作業時に、ステーボルト２２により複数枚の支え板１１の変形や傾斜が防止されるので、第１の実施の形態の効果と同様に、伝熱管８の抜管作業を容易化できる。   (3) When the tube bundle 12 including the stay bolt 22 is slid on the rail 28 and carried out of the condenser 20 in a state where the plurality of support plates 11 are held using the stay bolt 22, The stay bolt 22 serves as a reinforcing member to improve the strength of the tube bundle 12 and prevent the tube bundle 12 from being deformed when the tube bundle 12 is carried out. Further, during the work of extracting the heat transfer tube 8 outside the condenser 20, the stay bolts 22 prevent deformation and inclination of the plurality of support plates 11, so that, similarly to the effect of the first embodiment, the heat transfer. The tube extraction work of the heat tube 8 can be facilitated.

［Ｃ］第３の実施の形態（図４）
図４は、本発明に係る復水器の伝熱管抜管工法における第３の実施の形態を実施している状況を示し、（Ａ）が復水器の側面断面図、（Ｂ）が図４（Ａ）における伝熱管の一端部を拡大した部分拡大断面図、（Ｃ）が第３の実施の形態を変形した、図４（Ｂ）に対応した部分拡大断面図である。この第３の実施の形態において、前記第１の実施の形態及び従来技術と同様な部分は、同一の符号を付すことにより説明を省略する。 [C] Third embodiment (FIG. 4)
FIG. 4 shows a situation in which the third embodiment of the heat exchanger tube extracting method for a condenser according to the present invention is being implemented, (A) is a side sectional view of the condenser, and (B) is FIG. FIG. 5 is a partially enlarged sectional view in which one end portion of the heat transfer tube in (A) is enlarged, and (C) is a partially enlarged sectional view corresponding to FIG. 4 (B) in which the third embodiment is modified. In the third embodiment, the same parts as those in the first embodiment and the prior art are denoted by the same reference numerals, and the description thereof is omitted.

本実施の形態の伝熱管８の抜管工法は、入口水室６及び出口水室７を取り除き、入口側管板９及び出口側管板１０を撤去した後あるいは撤去前に、図４（Ａ）及び（Ｂ）に示すように、伝熱管８の内側に切断工具２９を挿入し、この切断工具２９を伝熱管８の管軸方向に移動させて、当該伝熱管８を、その全長に亘り管軸に平行な方向に切断する。次に、上記切断工具２９を軸回りに所定角度回転させた後、伝熱管８の管軸方向に移動させて、当該伝熱管８を、周方向に異なる位置で全長に亘り上記管軸と平行な方向に切断する。このようにして、伝熱管８を管軸と平行な方向に複数に分割し、各分割部分を順次引き抜いて伝熱管８を抜管する。   In the method of extracting the heat transfer tube 8 of the present embodiment, the inlet water chamber 6 and the outlet water chamber 7 are removed, and the inlet side tube plate 9 and the outlet side tube plate 10 are removed or before being removed, as shown in FIG. And as shown to (B), the cutting tool 29 is inserted inside the heat exchanger tube 8, this cutting tool 29 is moved to the pipe-axis direction of the heat exchanger tube 8, and the said heat exchanger tube 8 is a pipe over the full length. Cut in a direction parallel to the axis. Next, after rotating the cutting tool 29 by a predetermined angle around the axis, the cutting tool 29 is moved in the tube axis direction of the heat transfer tube 8, and the heat transfer tube 8 is parallel to the tube axis over the entire length at different positions in the circumferential direction. Cut in any direction. In this way, the heat transfer tube 8 is divided into a plurality of parts in a direction parallel to the tube axis, and the divided portions are sequentially pulled out to extract the heat transfer tube 8.

または、入口側管板９及び出口側管板１０を撤去した後あるいは撤去前に、図４（Ｃ）に示す切断工具３０を伝熱管８の内側に挿入し、この切断工具３０を軸回りに回転させながら伝熱管８の管軸方向に移動させて、伝熱管８の管軸に対し螺旋状に当該伝熱管８を全長に亘り切断する。このようにして、螺旋状に切断されて分割された複数の分割部分を上記管軸回りに回転させながら順次引き抜き、伝熱管８を抜管する。   Alternatively, after removing the inlet side tube plate 9 and the outlet side tube plate 10 or before removing, the cutting tool 30 shown in FIG. 4C is inserted inside the heat transfer tube 8, and the cutting tool 30 is rotated around the axis. It is moved in the tube axis direction of the heat transfer tube 8 while being rotated, and the heat transfer tube 8 is cut over the entire length spirally with respect to the tube axis of the heat transfer tube 8. In this way, the plurality of divided portions that are cut and spirally divided are sequentially pulled out while rotating around the tube axis, and the heat transfer tube 8 is extracted.

尚、切断工具２９または３０による伝熱管８の切断前に、第１の実施の形態と同様にして、複数枚の支え板１１から数本の伝熱管８を抜管し、この伝熱管８が抜管されて形成された穴のそれぞれにステーボルト２２を挿入し、これら伝熱管８の管軸方向に延在するステーボルト２２によって複数枚の支え板１１を保持してもよい。   Before the heat transfer tube 8 is cut by the cutting tool 29 or 30, several heat transfer tubes 8 are extracted from the plurality of support plates 11 in the same manner as in the first embodiment, and the heat transfer tubes 8 are extracted. The stay bolts 22 may be inserted into the holes thus formed, and the support plates 11 may be held by the stay bolts 22 extending in the tube axis direction of the heat transfer tubes 8.

以上のように構成されたことから、本実施の形態によれば、次の効果（４）及び（５）を奏する。   With the configuration as described above, the following effects (4) and (5) are achieved according to the present embodiment.

（４）入口側管板９及び出口側管板１０を撤去した後、伝熱管８を当該伝熱管８の管軸方向に平行に、または伝熱管８の管軸方向に対して螺旋状に全長に亘り切断し、これらの切断されて分割された部分を順次引き抜いて伝熱管８を抜管する。このように、伝熱管８を管軸方向に平行に、または当該管軸方向に対して螺旋状に切断することから、伝熱管８と支え板１１との間の接触面積が減少し、しかも、切断されて分割された部分を順次引き抜いて伝熱管８を抜管するので、この抜管を容易化できる。この結果、抜管作業の作業員を大幅に低減できると共に、工期を短縮できる。   (4) After removing the inlet side tube plate 9 and the outlet side tube plate 10, the heat transfer tube 8 is parallel to the tube axis direction of the heat transfer tube 8 or spirally with respect to the tube axis direction of the heat transfer tube 8. The heat transfer tube 8 is extracted by sequentially pulling out these divided portions. Thus, since the heat transfer tube 8 is cut parallel to the tube axis direction or spirally with respect to the tube axis direction, the contact area between the heat transfer tube 8 and the support plate 11 is reduced, Since the heat transfer tube 8 is extracted by sequentially extracting the cut and divided portions, this extraction can be facilitated. As a result, the number of extubation workers can be greatly reduced and the construction period can be shortened.

（５）複数枚の支え板１１をステーボルト２２を用いて保持した状態で、切断工具２９または３０を用いて伝熱管８を切断し、切断されて分割された部分を順次引き抜いて伝熱管熱を抜管する場合には、分割部分の引き抜き時にステーボルト２２が支え板１１の変形や傾斜を防止できるので、第１の実施の形態と同様に、伝熱管８の抜管作業をより一層容易化できる。この結果、抜管工事の作業員をより一層低減でき、工期をより一層短縮できる。   (5) The heat transfer tube 8 is cut using the cutting tool 29 or 30 in a state where the plurality of support plates 11 are held using the stay bolts 22, and the cut and divided portions are sequentially pulled out to heat the heat transfer tube. Since the stay bolt 22 can prevent the support plate 11 from being deformed or inclined when the divided portion is pulled out, the tube transfer operation of the heat transfer tube 8 can be further facilitated as in the first embodiment. . As a result, it is possible to further reduce the number of workers for the tube extraction work and further shorten the construction period.

［Ｄ］第４の実施の形態図（図５）
図５は、本発明に係る復水器の伝熱管抜管工法における第４の実施の形態を実施している状況を示し、（Ａ）が復水器の側面断面図、（Ｂ）が図５（Ａ）における伝熱管の一端部を拡大した部分拡大断面図である。この第４の実施の形態において、前記第１の実施の形態及び従来技術と同様な部分は、同一の符号を付すことにより説明を省略する。 [D] Fourth embodiment (FIG. 5)
FIG. 5 shows a situation in which the fourth embodiment of the heat transfer tube extracting method for a condenser according to the present invention is being implemented, (A) is a side sectional view of the condenser, and (B) is FIG. It is the elements on larger scale which expanded the one end part of the heat exchanger tube in (A). In the fourth embodiment, the same parts as those in the first embodiment and the prior art are denoted by the same reference numerals, and the description thereof is omitted.

本実施の形態の伝熱管８の抜管工法では、入口水室６及び出口水室７を取り除き、入口側管板９及び出口側管板１０を撤去した後、伝熱管８の一端部に治具３１を挿入して取り付け、この治具３１をハンマー３２等で強打することにより、伝熱管８を間接的に打ち抜いて抜管する。或いは、上記治具３１を取り付けることなく、伝熱管８の一端部を直接ハンマー３２にて強打して打ち抜き、伝熱管８を抜管してもよい。   In the method of extracting the heat transfer tube 8 according to the present embodiment, the inlet water chamber 6 and the outlet water chamber 7 are removed, the inlet side tube plate 9 and the outlet side tube plate 10 are removed, and then a jig is attached to one end of the heat transfer tube 8. 31 is inserted and attached, and the jig 31 is struck with a hammer 32 or the like, so that the heat transfer tube 8 is indirectly punched and extracted. Alternatively, without attaching the jig 31, one end of the heat transfer tube 8 may be directly struck and punched with a hammer 32, and the heat transfer tube 8 may be extracted.

尚、ハンマー３２を用いた伝熱管８の打ち抜き前に、第１の実施の形態と同様にして、複数枚の支え板１１から数本の伝熱管８を抜管し、この伝熱管８が抜管されて形成された穴のそれぞれにステーボルト２２を挿入し、これら伝熱管８の管軸方向に延在するステーボルト２２によって複数枚の支え板１１を保持してもよい。   Before punching out the heat transfer tube 8 using the hammer 32, several heat transfer tubes 8 are extracted from the plurality of support plates 11 in the same manner as in the first embodiment, and the heat transfer tubes 8 are extracted. The plurality of support plates 11 may be held by the stay bolts 22 extending in the tube axis direction of the heat transfer tubes 8 by inserting the stay bolts 22 into the holes formed in this manner.

以上のように構成されたことから、本実施の形態によれば、次の効果（６）及び（７）を奏する。   With the configuration as described above, the following effects (6) and (7) are achieved according to the present embodiment.

（６）入口側管板９及び出口側管板１０を撤去した後、伝熱管８の一端部を直接、または治具３１を介して間接的に、ハンマー３２等を用いて強打し打ち抜くことにより伝熱管８を抜管することから、伝熱管８の抜管を短時間に実施できる。このため、伝熱管８の抜管作業の作業時間を大幅に低減でき、工期を短縮できる。   (6) After removing the inlet side tube sheet 9 and the outlet side tube sheet 10, by punching and punching one end of the heat transfer tube 8 directly or indirectly through the jig 31 using a hammer 32 or the like. Since the heat transfer tube 8 is extracted, the heat transfer tube 8 can be extracted in a short time. For this reason, the work time of the tube extraction work of the heat transfer tube 8 can be significantly reduced, and the construction period can be shortened.

（７）複数枚の支え板１１をステーボルト２２を用いて保持した状態で、伝熱管８を打ち抜いて抜管する場合には、伝熱管８の打ち抜き時に、ステーボルト２２が支え板１１の変形や傾斜を防止できるので、第１の実施の形態と同様に、伝熱管８の抜管作業をより一層容易化できる。この結果、抜管工事の作業員をより一層低減でき、工期をより一層短縮できる。   (7) When a plurality of support plates 11 are held using the stay bolts 22 and the heat transfer tubes 8 are punched and removed, when the heat transfer tubes 8 are punched, the stay bolts 22 are deformed or Since the inclination can be prevented, the tube extraction work of the heat transfer tube 8 can be further facilitated as in the first embodiment. As a result, it is possible to further reduce the number of workers for the tube extraction work and further shorten the construction period.

［Ｅ］第５の実施の形態（図６）
図６は、本発明に係る復水器の伝熱管抜管工法における第５の実施の形態を実施している状況を示し、（Ａ）が復水器の側面断面図、（Ｂ）が図６（Ａ）における伝熱管の一端部を拡大した部分拡大断面図である。この第５の実施の形態において、前記第１の実施の形態及び従来技術と同様な部分は、同一の符号を付すことにより重複説明を省略する。 [E] Fifth embodiment (FIG. 6)
FIG. 6 shows a situation in which the fifth embodiment of the heat exchanger tube extracting method for a condenser according to the present invention is being implemented, (A) is a side sectional view of the condenser, and (B) is FIG. It is the elements on larger scale which expanded the one end part of the heat exchanger tube in (A). In the fifth embodiment, the same parts as those in the first embodiment and the prior art are denoted by the same reference numerals, and redundant description is omitted.

本実施の形態の伝熱管８の抜管工法では、入口水室６及び出口水室７を取り除き、入口側管板９及び出口側管板１０を撤去した後、伝熱管８の一端部に治具３３を溶接またはねじ等により取り付け、この治具３３を介して伝熱管８を引っ張ることにより、当該伝熱管８を抜管する。   In the method of extracting the heat transfer tube 8 according to the present embodiment, the inlet water chamber 6 and the outlet water chamber 7 are removed, the inlet side tube plate 9 and the outlet side tube plate 10 are removed, and then a jig is attached to one end of the heat transfer tube 8. 33 is attached by welding or a screw or the like, and the heat transfer tube 8 is pulled through the jig 33, whereby the heat transfer tube 8 is extracted.

尚、治具３３を用いた伝熱管８の引き抜き前に、第１の実施の形態と同様にして、複数枚の支え板１１から数本の伝熱管８を抜管し、この伝熱管８が抜管されて形成された穴のそれぞれにステーボルト２２を挿入し、これら伝熱管８の管軸方向に延在するステーボルト２２によって複数枚の支え板１１を保持してもよい。   Before the heat transfer tube 8 is extracted using the jig 33, several heat transfer tubes 8 are extracted from the plurality of support plates 11 in the same manner as in the first embodiment, and the heat transfer tubes 8 are extracted. The stay bolts 22 may be inserted into the holes thus formed, and the support plates 11 may be held by the stay bolts 22 extending in the tube axis direction of the heat transfer tubes 8.

以上のように構成されたことから、本実施の形態によれば、次の効果（８）及び（９）を奏する。   With the configuration as described above, the following effects (8) and (9) are achieved according to the present embodiment.

（８）入口側管板９及び出口側管板１０を撤去した後、伝熱管８の一端部を、治具３３を介して引っ張ることにより伝熱管８を抜管することから、伝熱管８の抜管を短時間に実施できる。このため、抜管作業の作業時間を大幅に低減でき、工期を短縮できる。   (8) After removing the inlet side tube plate 9 and the outlet side tube plate 10, the heat transfer tube 8 is pulled out by pulling one end of the heat transfer tube 8 through the jig 33. Can be carried out in a short time. For this reason, the work time of the tube extraction work can be greatly reduced, and the construction period can be shortened.

（９）複数枚の支え板１１をステーボルト２２を用いて保持した状態で、治具３３を介して伝熱管８を引き抜いて抜管する場合には、伝熱管８の引き抜き時に、ステーボルト２２が支え板１１の変形や傾斜を防止できるので、第１の実施の形態と同様に、伝熱管８の抜管作業をより一層容易化できる。この結果、抜管工事の作業員をより一層低減でき、工期をより一層短縮できる。   (9) When the heat transfer tube 8 is pulled out through the jig 33 in the state where the plurality of support plates 11 are held using the stay bolts 22, the stay bolt 22 is removed when the heat transfer tube 8 is pulled out. Since the support plate 11 can be prevented from being deformed or inclined, the work of extracting the heat transfer tube 8 can be further facilitated as in the first embodiment. As a result, it is possible to further reduce the number of workers for the tube extraction work and further shorten the construction period.

本発明に係る復水器の伝熱管抜管工法における第１の実施の形態を説明する図。The figure explaining 1st Embodiment in the heat exchanger tube extraction method of the condenser which concerns on this invention. 本発明に係る復水器の伝熱管抜管工法における第２の実施の形態を説明する図。The figure explaining 2nd Embodiment in the heat exchanger tube extraction method of the condenser which concerns on this invention. 図２の復水器の側面断面図。FIG. 3 is a side sectional view of the condenser of FIG. 2. 本発明に係る復水器の伝熱管抜管工法における第３の実施の形態を説明する図であり、（Ａ）が復水器の側面断面図、（Ｂ）が図４（Ａ）における伝熱管の一端部を拡大した部分拡大断面図、（Ｃ）が第３の実施の形態を変形した、図４（Ｂ）に対応した部分拡大断面図。It is a figure explaining 3rd Embodiment in the heat exchanger tube extracting method of the condenser which concerns on this invention, (A) is side sectional drawing of a condenser, (B) is the heat exchanger tube in FIG. 4 (A). The partial expanded sectional view which expanded the one end part of FIG. 4, (C) is the partial expanded sectional view corresponding to FIG. 4 (B) which deform | transformed 3rd Embodiment. 本発明に係る復水器の伝熱管抜管工法における第４の実施の形態を説明する図であり、（Ａ）が復水器の側面断面図、（Ｂ）が図５（Ａ）における伝熱管の一端部を拡大した部分拡大断面図。It is a figure explaining 4th Embodiment in the heat exchanger tube extraction method of the condenser which concerns on this invention, (A) is side sectional drawing of a condenser, (B) is the heat exchanger tube in FIG. 5 (A). The partial expanded sectional view which expanded the one end part of. 本発明に係る復水器の伝熱管抜管工法における第５の実施の形態を説明する図であり、（Ａ）が復水器の側面断面図、（Ｂ）が図６（Ａ）における伝熱管の一端部を拡大した部分拡大断面図。It is a figure explaining 5th Embodiment in the heat exchanger tube extraction method of the condenser which concerns on this invention, (A) is side sectional drawing of a condenser, (B) is the heat exchanger tube in FIG. 6 (A). The partial expanded sectional view which expanded the one end part of. 既設の復水器を示す正面断面図。Front sectional drawing which shows the existing condenser. 図７のＶＩＩＩ−ＶＩＩＩ線に沿う断面図。Sectional drawing which follows the VIII-VIII line of FIG. 従来の復水器の伝熱管抜管工法を示す説明図。Explanatory drawing which shows the heat exchanger tube extraction method of the conventional condenser.

符号の説明Explanation of symbols

１ 蒸気タービン
８ 伝熱管
９ 入口側管板
１０ 出口側管板
１１ 支え板
２２ ステーボルト
２８ レール
２９、３０ 切断工具
３１、３３ 治具 DESCRIPTION OF SYMBOLS 1 Steam turbine 8 Heat transfer tube 9 Inlet side tube plate 10 Outlet side tube plate 11 Support plate 22 Stay bolt 28 Rail 29, 30 Cutting tool 31, 33 Jig

Claims (7)

蒸気タ−ビンからの排気蒸気等を、伝熱管を流れる冷却水により熱交換して復水とし、前記伝熱管の両端部が管板により、両端部以外の部分が複数枚の支え板により支持された復水器の伝熱管抜管工法において、
前記管板を撤去した後、複数枚の前記支え板を、前記伝熱管の管軸方向に延びる保持部材により保持した状態で、当該伝熱管を抜管することを特徴とする復水器の伝熱管抜管工法。 Exhaust steam from the steam turbine is heat-exchanged with cooling water flowing through the heat transfer tubes to form condensate, and both ends of the heat transfer tubes are supported by tube plates, and the portions other than both ends are supported by a plurality of support plates. In the heat exchanger tube extraction method
After removing the tube plate, the heat transfer tube is pulled out in a state where the plurality of support plates are held by a holding member extending in the tube axis direction of the heat transfer tube. Extubation method. 蒸気タ−ビンからの排気蒸気等を、伝熱管を流れる冷却水により熱交換して復水とし、前記伝熱管が両端部を管板により、両端部以外の部分を複数枚の支え板により支持された復水器の伝熱管抜管工法において、
前記管板を撤去した後、前記支え板の下方に、前記伝熱管の管軸方向に延びるレールを設置し、
複数本の前記伝熱管及び複数枚の前記支え板を一体として、または前記伝熱管の管軸方向に分割して、前記レールに沿って復水器外へ搬出することを特徴とする復水器の伝熱管抜管工法。 Exhaust steam from the steam turbine is heat-exchanged with cooling water flowing through the heat transfer tubes to form condensate, and the heat transfer tubes are supported at both ends by tube plates and the portions other than both ends are supported by a plurality of support plates. In the heat exchanger tube extraction method
After removing the tube plate, a rail extending in the tube axis direction of the heat transfer tube is installed below the support plate,
The condenser, wherein the plurality of heat transfer tubes and the plurality of support plates are integrated or divided in the tube axis direction of the heat transfer tubes and are carried out of the condenser along the rails. Heat transfer tube extraction method. 前記レール設置の前または後に、複数枚の支え板を、前記伝熱管の管軸方向に延びる保持部材により保持することを特徴とする請求項２に記載の復水器の伝熱管抜管工法。 The heat exchanger tube extracting method for a condenser according to claim 2, wherein the support plates are held by a holding member extending in a tube axis direction of the heat transfer tube before or after the rail installation. 蒸気タ−ビンからの排気蒸気等を、伝熱管を流れる冷却水により熱交換して復水とし、前記伝熱管が両端部を管板により、両端部以外の部分を複数枚の支え板により支持された復水器の伝熱管抜管工法において、
前記管板を撤去した後、前記伝熱管を当該伝熱管の管軸方向に平行に、または当該管軸方向に対して螺旋状に切断し、
これらの切断された部分を順次引き抜くことにより、前記伝熱管を抜管することを特徴とする復水器の伝熱管抜管工法。 Exhaust steam from the steam turbine is heat-exchanged with cooling water flowing through the heat transfer tubes to form condensate, and the heat transfer tubes are supported at both ends by tube plates and the portions other than both ends are supported by a plurality of support plates. In the heat exchanger tube extraction method
After removing the tube sheet, the heat transfer tube is cut parallel to the tube axis direction of the heat transfer tube or spirally with respect to the tube axis direction,
A heat transfer tube extracting method for a condenser, wherein the heat transfer tube is extracted by sequentially extracting the cut portions. 蒸気タ−ビンからの排気蒸気等を、伝熱管を流れる冷却水により熱交換して復水とし、前記伝熱管が両端部を管板により、両端部以外の部分を複数枚の支え板により支持された復水器の伝熱管抜管工法において、
前記管板を撤去した後、前記伝熱管を打ち抜くことにより、当該伝熱管を抜管することを特徴とする復水器の伝熱管抜管工法。 Exhaust steam from the steam turbine is heat-exchanged with cooling water flowing through the heat transfer tubes to form condensate, and the heat transfer tubes are supported at both ends by tube plates and the portions other than both ends are supported by a plurality of support plates. In the heat exchanger tube extraction method
A heat transfer tube extracting method for a condenser, wherein the heat transfer tube is extracted by punching out the heat transfer tube after removing the tube sheet. 蒸気タ−ビンからの排気蒸気等を、伝熱管を流れる冷却水により熱交換して復水とし、前記伝熱管が両端部を管板により、両端部以外の部分を複数枚の支え板により支持された復水器の伝熱管抜管工法において、
前記管板を撤去した後、前記伝熱管の端部に引き抜き用治具を取り付け、この引き抜き用治具を用いて当該伝熱管を引き抜くことにより、前記伝熱管を抜管することを特徴とする復水器の伝熱管抜管工法。 Exhaust steam from the steam turbine is heat-exchanged with cooling water flowing through the heat transfer tubes to form condensate, and the heat transfer tubes are supported at both ends by tube plates and the portions other than both ends are supported by a plurality of support plates. In the heat exchanger tube extraction method
After the tube sheet is removed, an extraction jig is attached to an end of the heat transfer tube, and the heat transfer tube is extracted by using the extraction jig to extract the heat transfer tube. Heat pipe extraction method for water heaters. 前記切断、引き抜きまたは打ち抜き前に、複数枚の支え板を、前記伝熱管の管軸方向に延びる保持部材により保持することを特徴とする請求項４乃至６のいずれかに記載の復水器の伝熱管抜管工法。 The condenser according to any one of claims 4 to 6, wherein a plurality of support plates are held by a holding member extending in a tube axis direction of the heat transfer tube before the cutting, drawing or punching. Heat transfer tube extraction method.
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