JP6632438B2 - Repair method of waste heat recovery boiler - Google Patents

Repair method of waste heat recovery boiler Download PDF

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JP6632438B2
JP6632438B2 JP2016055059A JP2016055059A JP6632438B2 JP 6632438 B2 JP6632438 B2 JP 6632438B2 JP 2016055059 A JP2016055059 A JP 2016055059A JP 2016055059 A JP2016055059 A JP 2016055059A JP 6632438 B2 JP6632438 B2 JP 6632438B2
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武司 西尾
武司 西尾
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Osaka Gas Co Ltd
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本発明は、平行状に位置する上部管寄せと下部管寄せとの管軸心方向に沿って並ぶ複数の伝熱管を前記上部管寄せと前記下部管寄せとの間に接続した熱交換パネルが、ガスタービンの排ガス流動方向に並設された排熱回収ボイラの補修方法に関する。   The present invention provides a heat exchange panel in which a plurality of heat transfer tubes arranged in parallel along the axial direction of an upper header and a lower header located in parallel are connected between the upper header and the lower header. The present invention relates to a method for repairing an exhaust heat recovery boiler arranged in the exhaust gas flow direction of a gas turbine.

コンバインドサイクル発電プラントは、ガスタービンによる発電に加えて、ガスタービンからの排ガスの排熱を回収して蒸気を生成し、その蒸気にて蒸気タービンを駆動して発電するものであり、排熱回収ボイラは、コンバインドサイクル発電プラントにおいて、ガスタービンからの排ガスの排熱を回収して蒸気を生成することになる。   A combined cycle power generation plant generates steam by collecting the exhaust heat of the exhaust gas from the gas turbine in addition to power generation by the gas turbine, and drives the steam turbine with the steam to generate power. In a combined cycle power plant, a boiler collects exhaust heat of exhaust gas from a gas turbine to generate steam.

排熱回収ボイラとしては、例えば、図２４に示すように、低圧蒸発器Ｕ１、低圧過熱器Ｕ２、中圧節炭器Ｖ１、中圧蒸発器Ｖ２、中圧過熱器Ｖ３、高圧節炭器Ｗ１、高圧蒸発器Ｗ２、高圧過熱器Ｗ３、及び、再熱器Ｔの複数種類の熱交換器を備えさせることになり、それら複数種類の熱交換器が、熱交換パネルＰを用いて構成されることになる。
尚、図中のＧＴは、ガスタービンである。 As the waste heat recovery boiler, for example, as shown in FIG. 24, a low-pressure evaporator U1, a low-pressure superheater U2, a medium-pressure economizer V1, an intermediate-pressure evaporator V2, an intermediate-pressure superheater V3, and a high-pressure economizer W1 , A high-pressure evaporator W2, a high-pressure superheater W3, and a reheater T, and the plurality of types of heat exchangers are configured using the heat exchange panel P. Will be.
GT in the figure is a gas turbine.

熱交換パネルには流体の通流により、腐食が発生する虞があり、そして、腐食が発生し易い熱交換パネルは、流体が水相あるいは気液二相になる節炭器や蒸発器を構成する熱交換パネルである。
ちなみに、腐食形態は、一般的な酸化による腐食とは異なり、流路が分岐するところや流路断面が変化する箇所に特徴的な腐食が発生する。この腐食を流加速腐食といい、ある条件が揃ったときに生じるコロージョンである。 Corrosion may occur due to the flow of fluid in the heat exchange panel, and the heat exchange panel, which is susceptible to corrosion, constitutes an economizer or evaporator in which the fluid becomes a water phase or a gas-liquid two-phase. Heat exchange panel.
Incidentally, the corrosion form is different from the corrosion due to general oxidation, and characteristic corrosion occurs at a place where a flow path branches or a place where a flow path cross section changes. This corrosion is called flow accelerated corrosion, and is corrosion that occurs when certain conditions are met.

また、熱交換パネルでみると、下方側部分が、上方側部分に較べて、流れ加速腐食が発生し易く、腐食により伝熱管等が減肉するので、肉厚が必要最小肉厚になるまでに補修する必要がある。   Also, looking at the heat exchange panel, the lower part is more susceptible to flow accelerated corrosion than the upper part, and the corrosion reduces the thickness of the heat transfer tubes, etc. Need to be repaired.

このような補修方法として、腐食が発生した伝熱管における下方側部分を切断して除去し、その後、伝熱管の切断した部分に、健全な伝熱管部分を溶接にて接続する方法がある（例えば、特許文献１参照。）。   As such a repair method, there is a method of cutting and removing a lower portion of the heat transfer tube in which corrosion has occurred, and then connecting a sound heat transfer tube portion to the cut portion of the heat transfer tube by welding (for example, And Patent Document 1.).

ちなみに、特許文献１においては、複数の熱交換パネルを密接状態に並べた熱交換パネルユニットの内方側の熱交換パネルの伝熱管に腐食が発生した場合において、腐食が生じた伝熱管、その腐食が生じた伝熱管の両横側に位置する複数の伝熱管、及び、その腐食が生じた伝熱管よりも手前の熱交換パネルの複数の伝熱管のうちの、腐食が生じた伝熱管やその伝熱管の横側に位置する伝熱管の手前側に位置する伝熱管のみを切断して除去し、次に、切断した伝熱管のうち、未切断の伝熱管に隣接する伝熱管の切断した端部に閉止栓を取付け、その後、閉止栓を取付けていない伝熱管の切断した部分に、健全な伝熱管部分を接続することが記載されている。   Incidentally, in Patent Literature 1, when corrosion occurs in the heat transfer tube of the heat exchange panel on the inner side of the heat exchange panel unit in which a plurality of heat exchange panels are closely arranged, the heat transfer tube that has been corroded, Of the heat transfer tubes located on both sides of the heat transfer tube where the corrosion occurred, and the heat transfer tube where the corrosion occurred among the heat transfer tubes of the heat exchange panel before the heat transfer tube where the corrosion occurred. Only the heat transfer tube located on the front side of the heat transfer tube located on the side of the heat transfer tube was cut and removed, and then, of the cut heat transfer tubes, the heat transfer tube adjacent to the uncut heat transfer tube was cut. It is described that a stopper is attached to an end portion, and thereafter, a healthy heat transfer tube portion is connected to a cut portion of the heat transfer tube to which the stopper is not attached.

尚、切断した全ての伝熱管に健全な伝熱管部分を接続しないのは、全ての伝熱管に健全な伝熱管部分を接続するとコスト高になるためであると記載されている。   In addition, it is described that the reason why a healthy heat transfer tube portion is not connected to all cut heat transfer tubes is that connecting a sound heat transfer tube portion to all heat transfer tubes increases costs.

特許第４９１２４３０号公報Japanese Patent No. 4912430

熱交換パネルの複数の伝熱管等における流体（水や蒸気）の流動状態はほぼ同様であるため、熱交換パネルの複数の伝熱管のうちの一つの伝熱管の下方側部分に流れ加速腐食や腐食が発生した場合には、他の伝熱管の下方側部分も腐食が進行していると考えることができる。   Since the flow state of the fluid (water or steam) in the plurality of heat transfer tubes of the heat exchange panel is almost the same, the fluid flows into a lower portion of one of the plurality of heat transfer tubes of the heat exchange panel, and accelerated corrosion and When the corrosion occurs, it can be considered that the corrosion is also progressing on the lower part of the other heat transfer tubes.

したがって、熱交換パネルの複数の伝熱管のうちの一つの伝熱管の下方側部分に流れ加速腐食が発生した場合には、熱交換パネルの他の伝熱管の下方側部分を、交換対象部分として、健全な伝熱管部分に交換することが望ましいものであると考えることができる。   Therefore, when the accelerated corrosion occurs in the lower portion of one of the plurality of heat transfer tubes of the heat exchange panel and accelerated corrosion occurs, the lower portion of the other heat transfer tube of the heat exchange panel is set as a portion to be replaced. It can be considered that it is desirable to replace the heat transfer tube part with a sound one.

熱交換パネル伝熱管を健全な伝熱管部分に交換するにあたり、例えば、全ての伝熱管の下方側部分（交換対象部分）を健全な伝熱管部分に交換することが考えられ、そして、その交換にあたり、従来の如く、伝熱管の下方側部分を切断して除去し、その後、伝熱管の切断した部分に、健全な伝熱管部分を溶接にて接続することが考えられる。
しかしながら、熱交換パネルの複数（例えば、８０本）の伝熱管の全てについて、伝熱管の下方側部分（交換対象部分）を切断して除去し、その後、伝熱管の切断した部分に、健全な伝熱管部分を溶接にて接続する作業は、多大な手間が掛かる作業となる不都合がある。 In replacing the heat exchange panel heat transfer tubes with sound heat transfer tube portions, for example, it is conceivable to replace the lower side portion (replacement target portion) of all the heat transfer tubes with sound heat transfer tube portions. As in the related art, it is conceivable to cut and remove the lower portion of the heat transfer tube, and then connect a sound heat transfer tube portion to the cut portion of the heat transfer tube by welding.
However, for all of the plurality (for example, 80) of the heat transfer tubes of the heat exchange panel, the lower portion (the portion to be replaced) of the heat transfer tube is cut and removed, and then the cut portion of the heat transfer tube is replaced with a sound portion. The operation of connecting the heat transfer tube portions by welding has a disadvantage that it requires a lot of labor.

ちなみに、一般に、伝熱管の下端部は、下部管寄せに形成した接続孔に挿入した状態において、下部管寄せにおける接続孔の周縁部と伝熱管の表面部とを溶接する、いわゆる差し込み溶接にて下部管寄せに接続されることになる。
そして、流れ加速腐食は、伝熱管の下部管寄せに接続される下端側部分に発生し易いものである。 By the way, in general, the lower end of the heat transfer tube is inserted into a connection hole formed in the lower header, and the peripheral portion of the connection hole in the lower header and the surface of the heat transfer tube are welded by so-called insertion welding. It will be connected to the lower header.
The flow accelerated corrosion is likely to occur at the lower end portion of the heat transfer tube connected to the lower header.

したがって、伝熱管の下方側部分（交換対象部分）を健全な伝熱管部分に交換するには、伝熱管の下方側部分（交換対象部分）の上端に相当する箇所を切断しかつ下端部を下部管寄せから分離しながら、伝熱管の下方側部分（交換対象部分）を除去し、その後、健全な伝熱管部分の上端部を切断された伝熱管の下端部に突合せ溶接し、かつ、健全な伝熱管部分の下端部を下部管寄せに差し込み溶接することになる。   Therefore, in order to replace the lower part (replacement target part) of the heat transfer tube with a sound heat transfer tube part, a portion corresponding to the upper end of the lower part (replacement target part) of the heat transfer tube is cut and the lower end part is lowered. While separating from the header, remove the lower part (replacement target part) of the heat transfer tube, then butt-weld the upper end of the healthy heat transfer tube to the lower end of the cut heat transfer tube, and The lower end of the heat transfer tube portion is inserted into the lower header and welded.

しかしながら、伝熱管の下方側部分（交換対象部分）の下端部を下部管寄せから分離する作業や、健全な伝熱管部分の下端部を下部管寄せに差し込み溶接する作業が、手間の掛かる煩雑な作業となることに起因して、伝熱管の下方側部分（交換対象部分）を健全な伝熱管部分に交換する作業、つまり、熱交換パネルの補修作業が手間の掛かる煩雑な作業となる不都合がある。   However, the work of separating the lower end of the lower part (the part to be replaced) of the heat transfer tube from the lower header and the work of inserting the lower end of a sound heat transfer tube part into the lower header and welding are troublesome and complicated. Due to the work, the work of replacing the lower part (replacement target part) of the heat transfer tube with a sound heat transfer tube part, that is, the work of repairing the heat exchange panel becomes a troublesome and cumbersome work. is there.

ちなみに、例えば、高圧節炭器や低圧節炭器等の熱交換器を、複数の熱交換パネルをガスタービンの排ガス流動方向に沿って密接状態に並設する形態で構成する場合には、熱交換器を構成する複数の熱交換パネルのうちの一つの熱交換パネルの伝熱管に流れ加速腐食が発生した場合には、他の熱交換パネルの伝熱管についても、流れ加速腐食が進行しているものと考えることができる。   Incidentally, for example, when a heat exchanger such as a high-pressure economizer or a low-pressure economizer is configured in a form in which a plurality of heat exchange panels are closely arranged along the exhaust gas flow direction of the gas turbine, heat When accelerated corrosion occurs in the heat transfer tubes of one of the plurality of heat exchange panels constituting the heat exchanger, flow accelerated corrosion also proceeds in the heat transfer tubes of the other heat exchange panels. You can think that there is.

したがって、複数の熱交換パネルをガスタービンの排ガス流動方向に沿って密接状態に並設する形態で熱交換器を構成する場合には、熱交換器を構成する複数の熱交換パネルのうちの一つの熱交換パネルの伝熱管に流れ加速腐食が発生した場合には、全ての熱交換パネルの伝熱管の下方側部分を、交換対象部分として、健全な伝熱管部分に交換する必要があるが、複数の熱交換パネルの夫々について、手間の掛かる煩雑な補修作業を行わなければならないものとなる。   Therefore, when the heat exchanger is configured in such a manner that the plurality of heat exchange panels are closely arranged side by side along the exhaust gas flow direction of the gas turbine, one of the plurality of heat exchange panels constituting the heat exchanger is provided. If accelerated corrosion occurs in the heat transfer tubes of one heat exchange panel and the accelerated corrosion occurs, it is necessary to replace the lower part of the heat transfer tubes of all the heat exchange panels with a healthy heat transfer tube part as a replacement target part, For each of the plurality of heat exchange panels, a troublesome and complicated repair work must be performed.

本発明は、上記実状に鑑みて為されたものであって、その目的は、熱交換パネルの補修作業の容易化を図ることができる排熱回収ボイラの補修方法を提供する点にある。   The present invention has been made in view of the above situation, and an object of the present invention is to provide a method for repairing an exhaust heat recovery boiler that can facilitate repair work on a heat exchange panel.

本発明の排熱回収ボイラの補修方法は、平行状に位置する上部管寄せと下部管寄せとの管軸心方向に沿って並ぶ複数の伝熱管を前記上部管寄せと前記下部管寄せとの間に接続した熱交換パネルが、ガスタービンの排ガス流動方向に並設された排熱回収ボイラの補修方法であって、その特徴構成は、
前記熱交換パネルの前記下部管寄せに対応する交換用下部管寄せと複数の前記伝熱管の下方側の交換対象部分に対応する交換用伝熱管部分とを備える形態に製作した交換用パネル部分を予め準備し、
前記熱交換パネルの複数の前記伝熱管を、前記交換対象部分を切り離す状態に切断して、前記熱交換パネルの前記下部管寄せ及び前記伝熱管の前記交換対象部分を分離し、
その後、前記交換用パネル部分の前記交換用伝熱管部分の上端部を前記伝熱管における前記交換対象部分が切り離された上方側管部分の下端部に溶接して、前記交換用パネル部分を前記熱交換パネルに装着することを特徴とする。 The method of repairing an exhaust heat recovery boiler of the present invention includes the steps of: combining a plurality of heat transfer tubes arranged in parallel along the axial direction of the upper header and the lower header with the upper header and the lower header. The heat exchange panel connected in between is a method for repairing the exhaust heat recovery boiler arranged in parallel in the exhaust gas flow direction of the gas turbine, the characteristic configuration of which is:
A replacement panel portion manufactured in a form including a replacement lower header corresponding to the lower header of the heat exchange panel and a replacement heat transfer tube portion corresponding to a portion to be replaced below the plurality of heat transfer tubes. Prepare in advance,
A plurality of the heat transfer tubes of the heat exchange panel, cut to cut off the portion to be replaced, to separate the lower header of the heat exchange panel and the portion to be replaced of the heat transfer tube,
Thereafter, an upper end portion of the replacement heat transfer tube portion of the replacement panel portion is welded to a lower end portion of the upper tube portion of the heat transfer tube from which the replacement target portion is cut off, and the replacement panel portion is heat-exchanged. It is characterized by being attached to a replacement panel.

すなわち、予め、熱交換パネルの下部管寄せに対応する交換用下部管寄せと複数の伝熱管の下方側の交換対象部分に対応する交換用伝熱管部分とを備える形態に製作した交換用パネル部分を準備しておく。   That is, a replacement panel portion previously manufactured in a form including a replacement lower header corresponding to the lower header of the heat exchange panel and a replacement heat transfer tube portion corresponding to a replacement target portion below the plurality of heat transfer tubes. Be prepared.

ちなみに、交換用パネル部分を製作するには、交換用伝熱管部分の下端部を交換用下部管寄せに対して差し込み溶接することになるが、交換用パネル部分の製作は、工場内等の広い空間において、位置決め冶具等を用いながら行うことができるため、交換用伝熱管部分の下端部を交換用下部管寄せに対して差し込み溶接する作業は、容易に行うことができる。   By the way, in order to manufacture the replacement panel portion, the lower end of the replacement heat transfer tube portion is inserted and welded to the replacement lower header, but the replacement panel portion is manufactured in a wide area such as in a factory. Since it can be performed in a space while using a positioning jig or the like, the work of inserting and welding the lower end of the replacement heat transfer tube portion to the replacement lower header can be easily performed.

そして、伝熱管の下方側部分に流れ加速腐食が発生して、熱交換パネルを補修する際には、先ず、熱交換パネルの複数の伝熱管を、当該伝熱管の下方側の交換対象部分を切り離す状態に切断して、熱交換パネルの下部管寄せ及び伝熱管の交換対象部分を分離する。
その後、交換用パネル部分の交換用伝熱管部分の上端部を伝熱管における交換対象部分が切り離された上方側管部分の下端部に溶接して、交換用パネル部分を熱交換パネルに装着することになる。 Then, when accelerated corrosion occurs in the lower portion of the heat transfer tube and accelerated corrosion occurs, when repairing the heat exchange panel, first, the plurality of heat transfer tubes of the heat exchange panel are replaced with the portion to be replaced on the lower side of the heat transfer tube. The heat exchange panel is cut to be separated and the lower header of the heat exchange panel and the portion to be exchanged of the heat transfer tube are separated.
Thereafter, the upper end of the replacement heat transfer tube portion of the replacement panel portion is welded to the lower end of the upper tube portion of the heat transfer tube from which the replacement target portion has been cut off, and the replacement panel portion is attached to the heat exchange panel. become.

したがって、熱交換パネルを補修する際に、伝熱管の下方側部分（交換対象部分）の下端部を下部管寄せから分離する作業や、交換用伝熱管部分の下端部を下部管寄せに差し込み溶接する作業が不要となるため、熱交換パネルの補修作業を容易に行うことができる。   Therefore, when repairing the heat exchange panel, work to separate the lower end of the lower part of the heat transfer tube (part to be replaced) from the lower header, or insert the lower end of the replacement heat transfer tube into the lower header and weld This eliminates the need for such work, so that the heat exchange panel can be easily repaired.

要するに、本発明の排熱回収ボイラの補修方法によれば、熱交換パネルの補修作業の容易化を図ることできる。   In short, according to the method for repairing an exhaust heat recovery boiler of the present invention, repair work of a heat exchange panel can be facilitated.

また、本発明の排熱回収ボイラの補修方法の更なる特徴構成は、複数の前記熱交換パネルが、前記排ガス流動方向に沿って密接状態に並設され、
密接状態に並ぶ複数の前記熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとして、それら交換対象の熱交換パネルのうちの一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、複数の前記伝熱管を、前記交換対象部分を切り離す状態に切断して、前記熱交換パネルの前記下部管寄せ及び前記伝熱管の前記交換対象部分を分離し、
その後、複数の前記交換対象の熱交換パネルのうちの他端側の熱交換パネルから一端側の熱交換パネルに向けて、順次、前記交換用パネル部分の前記交換用伝熱管部分の上端部を前記伝熱管における前記交換対象部分が切り離された上方側管部分の下端部に溶接して、前記交換用パネル部分を前記熱交換パネルに装着することを特徴とする点にある。 Further, a further characteristic configuration of the method for repairing an exhaust heat recovery boiler of the present invention is such that a plurality of the heat exchange panels are closely arranged in a line along the exhaust gas flow direction,
Among the plurality of heat exchange panels arranged in a close state, a plurality of heat exchange panels directed from one end side to the other end side in the arrangement direction are set as heat exchange panels to be exchanged, and one end of the heat exchange panels to be exchanged. A plurality of the heat transfer tubes are sequentially cut from the heat exchange panel on the side to the heat exchange panel on the other end so as to cut off the portion to be replaced, and the lower header and the transfer of the heat exchange panel are cut off. Separating the replacement part of the heat tube,
Thereafter, from the heat exchange panel on the other end side of the plurality of heat exchange panels to be exchanged toward the heat exchange panel on one end side, the upper end of the exchange heat transfer tube portion of the exchange panel portion is sequentially arranged. The present invention is characterized in that the replacement panel portion is attached to the heat exchange panel by welding to a lower end portion of the upper tube portion from which the replacement target portion of the heat transfer tube is cut off.

すなわち、複数の熱交換パネルが、排ガス流動方向に沿って密接状態に並設される形態において、密接状態に並ぶ複数の熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとする場合には、先ず、それら交換対象の熱交換パネルのうちの一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、複数の伝熱管を、交換対象部分を切り離す状態に切断して、熱交換パネルの下部管寄せ及び伝熱管の交換対象部分を分離する。   That is, in a form in which the plurality of heat exchange panels are closely arranged in the exhaust gas flow direction, among the plurality of heat exchange panels arranged in the close state, a plurality of heat exchange panels from one end side in the arrangement direction to the other end side are arranged. When the heat exchange panels of the exchange target heat exchange panels are used, first, a plurality of the heat exchange panels to be exchanged are sequentially arranged from the heat exchange panel on one end side to the heat exchange panel on the other end side. Is cut so that the portion to be replaced is cut off, and the lower header of the heat exchange panel and the portion to be replaced of the heat transfer tube are separated.

つまり、熱交換パネルの伝熱管を、交換対象部分を切り離す状態に切断して、熱交換パネルの下部管寄せ及び伝熱管の交換対象部分を分離することを、複数の交換対象の熱交換パネルのうちの一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次行う。   In other words, cutting the heat transfer tubes of the heat exchange panel so as to cut off the portion to be replaced, and separating the lower header of the heat exchange panel and the portion to be replaced of the heat transfer tube are performed by a plurality of heat exchange panels to be replaced. The process is sequentially performed from the heat exchange panel on one end side to the heat exchange panel on the other end side.

その後、複数の交換対象の熱交換パネルのうちの他端側の熱交換パネルから一端側の熱交換パネルに向けて、順次、交換用パネル部分の交換用伝熱管部分の上端部を伝熱管における交換対象部分が切り離された上方側管部分の下端部に溶接して、交換用パネル部分を熱交換パネルに装着することになる。   Then, from the heat exchange panel on the other end of the plurality of heat exchange panels to be exchanged, toward the heat exchange panel on the one end side, in order, the upper end of the replacement heat transfer tube portion of the replacement panel portion in the heat transfer tube. The portion to be replaced is welded to the lower end of the separated upper tube portion, and the replacement panel portion is mounted on the heat exchange panel.

つまり、交換用パネル部分の交換用伝熱管部分の上端部を伝熱管における交換対象部分が切り離された上方側管部分の下端部に溶接して、交換用パネル部分を熱交換パネルに装着することを、複数の交換対象の熱交換パネルのうちの他端側の熱交換パネルから一端側の熱交換パネルに向けて、順次行う。   That is, the upper end portion of the replacement heat transfer tube portion of the replacement panel portion is welded to the lower end portion of the upper tube portion of the heat transfer tube from which the replacement target portion is cut off, and the replacement panel portion is attached to the heat exchange panel. Are sequentially performed from the heat exchange panel on the other end side of the plurality of heat exchange panels to be exchanged to the heat exchange panel on the one end side.

したがって、複数の熱交換パネルが、排ガス流動方向に沿って密接状態に並設される形態において、密接状態に並ぶ複数の熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとする場合においても、伝熱管の下方側部分（交換対象部分）の下端部を下部管寄せから分離する作業や、交換用伝熱管部分の下端部を下部管寄せに差し込み溶接する作業が不要となるため、複数の交換対象の熱交換パネルの補修作業を容易に行うことができる。   Therefore, in the form in which the plurality of heat exchange panels are closely arranged in the exhaust gas flow direction, among the plurality of heat exchange panels arranged in the close state, the plurality of heat exchange panels which are directed from one end side to the other end side in the arrangement direction. In the case where the heat exchange panel is replaced with a heat exchange panel to be replaced, the work of separating the lower end of the lower part of the heat transfer tube (part to be replaced) from the lower header and the lower end of the replacement heat transfer tube Since the work of inserting and welding to the lower header is not required, the repair work of the heat exchange panels to be replaced can be easily performed.

要するに、本発明の排熱回収ボイラの補修方法の更なる特徴構成によれば、密接状態に並ぶ複数の熱交換パネルの補修作業の容易化を図ることができる。   In short, according to the further characteristic configuration of the method for repairing an exhaust heat recovery boiler of the present invention, the repair work of a plurality of heat exchange panels arranged in close contact can be facilitated.

また、本発明の排熱回収ボイラの補修方法の更なる特徴構成は、複数の前記交換対象の熱交換パネルにおける前記伝熱管の前記交換対象部分の長さが同じであることを特徴とする点にある。   Further, a further characteristic configuration of the repair method of the exhaust heat recovery boiler of the present invention is characterized in that a plurality of the heat exchange tubes to be exchanged have the same length of the exchange target portion of the heat transfer tube. It is in.

すなわち、複数の熱交換パネルが、排ガス流動方向に沿って密接状態に並設される形態において、密接状態に並ぶ複数の熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとする場合において、複数の交換対象の熱交換パネルにおける伝熱管の交換対象部分の長さが同じであるから、複数の交換対象の熱交換パネルの夫々に装着する交換用パネル部分における交換用伝熱管分の長さが同じになる。   That is, in a form in which the plurality of heat exchange panels are closely arranged in the exhaust gas flow direction, among the plurality of heat exchange panels arranged in the close state, a plurality of heat exchange panels from one end side in the arrangement direction to the other end side are arranged. In the case where the heat exchange panel is replaced with a heat exchange panel to be replaced, the lengths of the heat exchange tubes to be replaced in the plurality of heat exchange panels to be replaced are the same. The length of the replacement heat transfer tube in the replacement panel portion to be mounted on the same becomes the same.

したがって、交換用パネル部分を、複数の交換対象の熱交換パネルについて共用できるものとなるから、複数の交換対象の熱交換パネルについて、一つの仕様の交換用パネル部分を製作すれば良いため、交換用パネル部分の製作が容易になる。   Therefore, since the replacement panel portion can be shared for a plurality of heat exchange panels to be replaced, the replacement panel portion having a single specification can be manufactured for the plurality of heat exchange panels to be replaced. Of the panel part for use becomes easy.

要するに、本発明の排熱回収ボイラの補修方法の更なる特徴構成によれば、交換用パネル部分の製作の容易化を図ることができる。   In short, according to the further characteristic configuration of the method for repairing an exhaust heat recovery boiler of the present invention, the production of the replacement panel portion can be facilitated.

また、本発明の排熱回収ボイラの補修方法の更なる特徴構成は、前記管軸心方向に沿って並ぶ複数の前記伝熱管が、前記排ガス流動方向の上手側に偏位する上手側偏位状態と前記排ガス流動方向の下手側に偏位する下手側偏位状態とに、前記管軸心方向に沿って交互に設置される形態で設けられ、
前記交換対象の熱交換パネルにおける前記上手側偏位状態の前記伝熱管と前記下手側偏位状態の前記伝熱管のうちの、複数の前記交換対象の熱交換パネルの並び方向の一端側となる伝熱管の前記交換対象部分の長さを、複数の前記交換対象の熱交換パネルの並び方向の他端側となる伝熱管の前記交換対象部分の長さよりも長くし、且つ、複数の前記交換対象の熱交換パネルにおける前記上手側偏位状態の伝熱管の前記交換対象部分の長さが同じでかつ複数の前記交換対象の熱交換パネルにおける前記下手側偏位状態の伝熱管の前記交換対象部分の長さが同じあることを特徴とする点にある。 Further, a further characteristic configuration of the method for repairing an exhaust heat recovery boiler according to the present invention is that a plurality of the heat transfer tubes arranged along the pipe axis direction are displaced to the upstream side in the exhaust gas flow direction. The state and the lower-side deviated state that is deviated to the lower side of the exhaust gas flow direction are provided in a form that is alternately installed along the pipe axis direction,
Of the heat transfer tubes in the upper side deviated state and the heat transfer tubes in the lower side deviated state in the heat exchange panel to be exchanged, the heat exchange tubes are located at one end side in the direction in which the plurality of heat exchange panels to be exchanged are arranged. The length of the exchange target portion of the heat transfer tube is longer than the length of the exchange target portion of the heat transfer tube on the other end side in the direction in which the plurality of heat exchange panels to be exchanged are arranged. The replacement target portions of the heat transfer tubes in the lower-side deviation state in the heat exchange panels to be replaced have the same length of the replacement target portions of the heat transfer tubes in the upper-side deviation state and the plurality of heat exchange panels to be replaced. It is characterized in that the lengths of the parts are the same.

すなわち、平行状に位置する上部管寄せと下部管寄せとの管軸心方向に沿って並ぶ複数の伝熱管が、排ガス流動方向の上手側に偏位する上手側偏位状態と排ガス流動方向の下手側に偏位する下手側偏位状態とに、管軸心方向に沿って交互に設置される形態で設けられているから、管軸心方向において隣り合う伝熱管を、管軸心方向において近接させて配置させるようにしながら、複数の伝熱管の夫々に対してガスタービンの排ガスを適切に流動させて、排熱回収効率を向上することができる。   In other words, a plurality of heat transfer tubes arranged along the axial direction of the upper header and the lower header located in parallel are deflected to the upstream side in the exhaust gas flow direction, In the lower side deflected state deviating to the lower side, since it is provided in a form that is alternately installed along the tube axis direction, heat transfer tubes adjacent in the tube axis direction, in the tube axis direction, The exhaust gas of the gas turbine can be made to flow appropriately to each of the plurality of heat transfer tubes while being arranged close to each other, so that the exhaust heat recovery efficiency can be improved.

そして、複数の熱交換パネルが、排ガス流動方向に沿って密接状態に並設される形態において、密接状態に並ぶ複数の熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとする場合において、交換対象の熱交換パネルにおける上手側偏位状態の前記伝熱管と下手側偏位状態の前記伝熱管のうちの、複数の交換対象の熱交換パネルの並び方向の一端側となる伝熱管の交換対象部分の長さを、複数の交換対象の熱交換パネルの並び方向の他端側となる伝熱管の交換対象部分の長さよりも長くするものであるから、交換用パネル部分の交換用伝熱管部分の上端部を伝熱管おける交換対象部分が切り離された上方側管部分の下端部に溶接する際に、その溶接作業の作業性を向上することができる。   And, in the form in which the plurality of heat exchange panels are closely arranged in the exhaust gas flow direction, among the plurality of heat exchange panels arranged in the close state, the plurality of heat exchange panels from one end side to the other end side in the arrangement direction. When the heat exchange panel is a heat exchange panel to be replaced, a plurality of heat exchange tubes among the heat transfer tubes in the upper-side deviated state and the heat transfer tubes in the lower-side deviated state in the heat exchange panel to be exchanged. The length of the exchange target portion of the heat transfer tube at one end in the direction in which the heat exchange panels are arranged is longer than the length of the exchange target portion of the heat transfer tube at the other end in the direction in which the heat exchange panels to be exchanged are arranged. Since the length is to be lengthened, when welding the upper end of the replacement heat transfer tube portion of the replacement panel portion to the lower end portion of the upper tube portion of the heat transfer tube where the replacement target portion is cut off, the workability of the welding work Can be improved .

つまり、交換用パネル部分の交換用伝熱管部分の上端部を伝熱管における交換対象部分が切り離された上方側管部分の下端部に溶接する際に、伝熱管における交換対象部分が切り離された上方側管部分の下端部の高さが、管軸心方向において隣り合うもの同士では異なる高さとなるため、管軸心方向において隣り合う伝熱管の上方側部分の下端部に対して、交換用パネル部分の交換用伝熱管部分を溶接することを、別の作業者によって同時に行うこと可能になる等、溶接作業の作業性を向上することができる。   That is, when welding the upper end portion of the replacement heat transfer tube portion of the replacement panel portion to the lower end portion of the upper side tube portion of the heat transfer tube from which the replacement target portion has been separated, Since the height of the lower end of the side tube portion is different between adjacent tubes in the tube axis direction, a replacement panel is provided for the lower end portion of the upper portion of the heat transfer tube adjacent in the tube axis direction. The workability of the welding operation can be improved, for example, the welding of the replacement heat transfer tube portion can be performed by another operator at the same time.

さらに、複数の交換対象の熱交換パネルにおける上手側偏位状態の伝熱管の交換対象部分の長さが同じでかつ複数の交換対象の熱交換パネルにおける下手側偏位状態の伝熱管の交換対象部分の長さが同じあるから、複数の交換対象の熱交換パネルの夫々に装着する交換用パネル部分を、複数の交換対象の熱交換パネルについて共用できるものとなるから、複数の交換対象の熱交換パネルについて、一つの仕様の交換用パネル部分を製作すれば良いため、交換用パネル部分の製作が容易になる。   Furthermore, the replacement target portions of the heat transfer tubes in the upper-side offset state in the plurality of heat exchange panels to be replaced have the same length and the heat transfer tubes in the lower-side offset state in the plurality of heat exchange panels to be replaced. Since the lengths of the portions are the same, the replacement panel portion to be attached to each of the plurality of heat exchange panels to be replaced can be shared by the plurality of heat exchange panels to be replaced. As for the replacement panel, it is only necessary to manufacture a replacement panel portion having one specification, so that the replacement panel portion can be easily manufactured.

要するに、本発明の排熱回収ボイラの補修方法の更なる特徴構成によれば、排熱回収効率を向上するようにしながら、溶接作業の作業性を向上でき、しかも、交換用パネル部分の製作の容易化を図ることができる。   In short, according to the further feature configuration of the method for repairing an exhaust heat recovery boiler of the present invention, the workability of welding work can be improved while improving the efficiency of exhaust heat recovery, and furthermore, the production of the replacement panel portion can be improved. It can be facilitated.

また、本発明の排熱回収ボイラの補修方法の更なる特徴構成は、前記管軸心方向に沿って並ぶ複数の前記伝熱管が、前記排ガス流動方向の上手側に偏位する上手側偏位状態と前記排ガス流動方向の下手側に偏位する下手側偏位状態とに、前記管軸心方向に沿って交互に設置される形態で設けられ、
前記交換対象の熱交換パネルにおける前記上手側偏位状態の前記伝熱管と前記下手側偏位状態の前記伝熱管の前記交換対象部分の長さが同じで、かつ、複数の前記交換対象の熱交換パネルの並び方向の一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、前記伝熱管の前記交換対象部分の長さを短くすることを特徴とする点にある。 Further, a further characteristic configuration of the method for repairing an exhaust heat recovery boiler according to the present invention is that a plurality of the heat transfer tubes arranged along the pipe axis direction are displaced to the upstream side in the exhaust gas flow direction. The state and the lower-side deviated state that is deviated to the lower side of the exhaust gas flow direction are provided in a form that is alternately installed along the pipe axis direction,
In the heat exchange panel to be replaced, the heat transfer tubes in the upper-side deviated state and the heat transfer tubes in the lower-side deviated state have the same length of the exchange target portion, and a plurality of heat exchange targets It is characterized in that the length of the exchange target portion of the heat transfer tube is sequentially reduced from the heat exchange panel on one end side in the arrangement direction of the exchange panels to the heat exchange panel on the other end side.

すなわち、平行状に位置する上部管寄せと下部管寄せとの管軸心方向に沿って並ぶ複数の伝熱管が、排ガス流動方向の上手側に偏位する上手側偏位状態と排ガス流動方向の下手側に偏位する下手側偏位状態とに、管軸心方向に沿って交互に設置される形態で設けられているから、管軸心方向において隣り合う伝熱管を、管軸心方向において近接させて配置させるようにしながら、複数の伝熱管の夫々に対してガスタービンの排ガスを適切に流動させて、排熱回収効率を向上することができる。   In other words, a plurality of heat transfer tubes arranged along the axial direction of the upper header and the lower header located in parallel are deflected to the upstream side in the exhaust gas flow direction, In the lower side deflected state deviating to the lower side, since it is provided in a form that is alternately installed along the tube axis direction, heat transfer tubes adjacent in the tube axis direction, in the tube axis direction, The exhaust gas of the gas turbine can be made to flow appropriately to each of the plurality of heat transfer tubes while being arranged close to each other, so that the exhaust heat recovery efficiency can be improved.

そして、複数の熱交換パネルが、排ガス流動方向に沿って密接状態に並設される形態において、密接状態に並ぶ複数の熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとする場合において、交換対象の熱交換パネルにおける上手側偏位状態の伝熱管の交換対象部分の長さと下手側偏位状態の伝熱管の交換対象部分の長さとが同じで、かつ、複数の交換対象の熱交換パネルの並び方向の一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、伝熱管の交換対象部分の長さを短くするから、熱交換パネルの複数の伝熱管を、当該伝熱管の下方側の交換対象部分を切り離す状態に切断することを容易に行うことが可能となり、伝熱管の切断作業を良好に行うことができる。   And, in the form in which the plurality of heat exchange panels are closely arranged in the exhaust gas flow direction, among the plurality of heat exchange panels arranged in the close state, the plurality of heat exchange panels from one end side to the other end side in the arrangement direction. In the case where the heat exchange panel of (1) is the heat exchange panel to be replaced, the length of the exchange target portion of the heat transfer tube in the upper side deviated state and the part of the heat exchange tube in the lower side deviated state in the heat exchange panel to be exchanged And the length of the portion of the heat transfer tube to be exchanged in order from the heat exchange panel on one end side to the heat exchange panel on the other end side in the direction in which the heat exchange panels to be exchanged are arranged. Is shortened, it is possible to easily cut the plurality of heat transfer tubes of the heat exchange panel in a state in which a portion to be replaced below the heat transfer tubes is cut off, and perform a good work of cutting the heat transfer tubes. be able to.

つまり、交換対象の熱交換パネルにおける上手側偏位状態の伝熱管の交換対象部分の長さと下手側偏位状態の伝熱管の交換対象部分の長さとが同じであるから、一つの熱交換パネルの複数の伝熱管を同じ高さで切断すればよいため、交換対象の熱交換パネルの伝熱管を切断する作業が容易となる。   That is, since the length of the exchange target portion of the heat transfer tube in the upper-side offset state and the length of the exchange target portion of the heat transfer tube in the lower-side offset state in the heat exchange panel to be exchanged are the same, one heat exchange panel Since the plurality of heat transfer tubes may be cut at the same height, the work of cutting the heat transfer tubes of the heat exchange panel to be replaced becomes easy.

しかも、複数の交換対象の熱交換パネルの並び方向の一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、伝熱管の交換対象部分の長さを短くするから、一端側の熱交換パネルの伝熱管を切断した後、その熱交換パネルの内方側（他端側）に位置する熱交換パネルの伝熱管を切断するときに、その切断位置が一端側の熱交換パネルの伝熱管の切断位置よりも低くなるため、一端側の熱交換パネルの内方側（他端側）に位置する熱交換パネルの伝熱管を切断するときに、一端側の熱交換パネルの伝熱管が邪魔になることを回避できるものとなり、一端側の熱交換パネルの内方側（他端側）に位置する熱交換パネルの伝熱管を切断する作業を良好に行える。   In addition, since the length of the portion to be replaced of the heat transfer tube is sequentially reduced from the heat exchange panel at one end in the direction in which the plurality of heat exchange panels to be exchanged are arranged to the heat exchange panel at the other end, After cutting the heat transfer tube of the heat exchange panel of the above, when cutting the heat transfer tube of the heat exchange panel located on the inner side (other end side) of the heat exchange panel, the cut position is the heat exchange panel of one end side Is lower than the cutting position of the heat transfer tube of the first end, so that when the heat transfer tube of the heat exchange panel located on the inner side (the other end side) of the heat exchange panel at one end is cut, the transfer of the heat exchange panel at the one end side is performed. The heat tube can be prevented from obstructing, and the operation of cutting the heat transfer tube of the heat exchange panel located inside (the other end) of the heat exchange panel at one end can be performed satisfactorily.

要するに、本発明の本発明の排熱回収ボイラの補修方法の更なる特徴構成によれば、排熱回収効率を向上するようにしながら、伝熱管の切断作業の作業性を向上できる。   In short, according to the further characteristic configuration of the method for repairing an exhaust heat recovery boiler of the present invention, it is possible to improve the efficiency of exhaust heat recovery while improving the workability of cutting a heat transfer tube.

また、本発明の排熱回収ボイラの補修方法の更なる特徴構成は、前記管軸心方向に並ぶ複数の前記伝熱管のうちの、前記管軸心方向において連絡管の接続箇所を含む一部の範囲の複数の伝熱管を交換対象伝熱管として、前記交換用パネル部分が、前記交換対象伝熱管における前記交換対象部分に対応する前記交換用伝熱管部分、及び、前記下部管寄せのうちの、前記交換対象伝熱管が接続される交換対象下部管寄せ部分に対応する交換用下部管寄せ部分を備える形態で作成され、
前記伝熱管のうちの前記交換対象伝熱管における前記交換対象部分を分離するときに、前記下部管寄せから前記交換対象下部管寄せ部分を切断して分離し、
前記交換用パネル部分を前記熱交換パネルに装着するときに、前記交換用伝熱管部分の上端部を前記交換対象伝熱管における前記交換対象部分が切り離された上方側管部分の下端部に溶接することに加えて、前記交換用下部管寄せ部分の端部を、前記下部管寄せにおける前記交換対象下部管寄せ部分が切り離されて残存する残存下部管寄せ部分の端部に溶接することを特徴とする点にある。 Further, a further characteristic configuration of the method for repairing an exhaust heat recovery boiler of the present invention is a part of the plurality of heat transfer tubes arranged in the tube axis direction, the portion including a connecting portion of a communication tube in the tube axis direction. A plurality of heat transfer tubes in the range as a heat transfer tube to be replaced, the replacement panel portion corresponds to the replacement portion of the heat transfer tube in the heat transfer tube to be replaced, and the lower header. Created in the form of having a replacement lower header portion corresponding to the replacement lower header portion to which the replacement heat transfer tube is connected,
When separating the replacement target portion of the replacement heat transfer tube of the heat transfer tubes, cut and separate the replacement target lower header portion from the lower header,
When attaching the replacement panel portion to the heat exchange panel, an upper end portion of the replacement heat transfer tube portion is welded to a lower end portion of the upper tube portion of the heat transfer tube to be replaced, from which the replacement target portion is cut off. In addition, an end portion of the replacement lower header portion is welded to an end of a remaining lower header portion where the replacement target lower header portion in the lower header portion is cut off and remains. Is to do.

すなわち、下部管寄せには、流体（水や蒸気）を下部管寄せに供給する又は下部管寄せから排出する連絡管が接続されることになり、そして、連絡管が接続される箇所の近くにおいては、流体（水や蒸気）の流れ状態が変化するため、連絡管が接続される箇所の近くの伝熱管には、流れ加速腐食等の腐食が発生し易いものであると考えることができる。   That is, the lower header is connected to a connecting pipe that supplies or discharges a fluid (water or steam) to or from the lower header, and near the point where the connecting pipe is connected. Since the flow state of the fluid (water or steam) changes, it can be considered that corrosion such as flow accelerated corrosion is likely to occur in the heat transfer tube near the point where the connecting tube is connected.

そこで、下部管寄せの管軸心方向に並ぶ複数の伝熱管のうちの、管軸心方向において連絡管の接続箇所を含む一部の範囲の複数の伝熱管を交換対象伝熱管として、交換用パネル部分が、交換対象伝熱管における交換対象部分に対応する交換用伝熱管部分、及び、下部管寄せのうちの、交換対象伝熱管が接続される交換対象下部管寄せ部分に対応する交換用下部管寄せ部分を備える形態で作成される。
つまり、予め、交換対象下部管寄せ部分に対応する交換用下部管寄せ部分と複数の交換対象伝熱管の下方側の交換対象部分に対応する交換用伝熱管部分とを備える形態に製作した交換用パネル部分を準備しておく。 Therefore, among the plurality of heat transfer tubes arranged in the tube axis direction of the lower header, a plurality of heat transfer tubes in a partial range including the connection point of the connecting tube in the tube axis direction are used as replacement heat transfer tubes. The panel portion is a replacement heat transfer tube portion corresponding to a replacement target portion of the replacement heat transfer tube, and a replacement lower portion corresponding to a replacement target lower header portion to which the replacement heat transfer tube is connected in the lower header. It is created in a form having a header part.
That is, a replacement pipe manufactured in a form including a replacement lower pipe header portion corresponding to the replacement target lower header portion and a replacement heat transfer tube portion corresponding to the replacement target portion below the plurality of replacement heat transfer tubes in advance. Prepare the panel part.

そして、複数の伝熱管のうちの複数の交換対象伝熱管の下方側部分に流れ加速腐食が発生して、熱交換パネルを補修する際には、先ず、複数の交換対象の複数の伝熱管を、当該伝熱管の下方側の交換対象部分を切り離す状態に切断することに加えて、交換対象下部管寄せ部分を切断して、熱交換パネルの交換用下部管寄せ及び交換対象伝熱管の交換対象部分を分離する。   Then, when the accelerated corrosion occurs in the lower part of the plurality of heat transfer tubes to be replaced among the plurality of heat transfer tubes and repairs the heat exchange panel, first, the plurality of heat transfer tubes to be replaced are replaced. , In addition to cutting the portion to be replaced on the lower side of the heat transfer tube, in addition to cutting the portion to be replaced, cutting the lower header portion to be replaced, the lower header for replacement of the heat exchange panel and the replacement target of the heat transfer tube to be replaced. Separate parts.

その後、交換用パネル部分の交換用伝熱管部分の上端部を交換対象伝熱管における交換対象部分が切り離された上方側管部分の下端部に溶接することに加えて、交換用下部管寄せ部分の端部を、下部管寄せにおける交換対象下部管寄せ部分が切り離されて残存する残存下部管寄せ部分の端部に溶接して、交換用パネル部分を熱交換パネルに装着することになる。   Then, in addition to welding the upper end of the replacement heat transfer tube portion of the replacement panel portion to the lower end of the upper side tube portion of the replacement heat transfer tube from which the replacement target portion has been cut off, The end is welded to the end of the remaining lower header portion where the replacement target lower header portion in the lower header is cut off, and the replacement panel portion is mounted on the heat exchange panel.

したがって、熱交換パネルを補修する際に、交換対象伝熱管の下方側部分（交換対象部分）の下端部を下部管寄せから分離する作業や、交換用伝熱管部分の下端部を下部管寄せに差し込み溶接する作業が不要となるため、熱交換パネルの補修作業を容易に行うことができる。
しかも、複数の伝熱管のうちの、一部の範囲の複数の伝熱管を交換対象の伝熱管とするものであるから、補修作業の簡略化を図ることができ、また、交換用パネル部分の低廉化により、補修に要するコストの低下を図ることができる。 Therefore, when repairing the heat exchange panel, work to separate the lower end of the lower portion (replacement target portion) of the heat transfer tube to be replaced from the lower header, and to attach the lower end of the replacement heat transfer tube to the lower header. Since the work of insertion welding becomes unnecessary, the repair work of the heat exchange panel can be easily performed.
Moreover, since a plurality of heat transfer tubes in a part of the plurality of heat transfer tubes are used as heat transfer tubes to be replaced, the repair work can be simplified and the replacement panel portion can be simplified. The cost reduction can reduce the cost required for repair.

要するに、本発明の排熱回収ボイラの補修方法によれば、熱交換パネルの補修作業の簡略化及び補修に要するコストの低下を図ることができる。   In short, according to the method for repairing an exhaust heat recovery boiler of the present invention, it is possible to simplify the repair work of the heat exchange panel and reduce the cost required for repair.

排熱回収ボイラの一部切欠概略斜視図Partially cutaway perspective view of an exhaust heat recovery boiler 熱交換パネルの縦断側面図Longitudinal side view of heat exchange panel 熱交換パネルユニットの並び状態を示す一部省略側面図Partially omitted side view showing the arrangement of heat exchange panel units 図３におけるＩＶ−ＩＶ線断面図IV-IV line sectional view in FIG. 熱交換パネルユニットの下方側部分を示す概略図Schematic showing the lower part of the heat exchange panel unit 第１実施形態の交換対象部分を分離する過程を示す概略図FIG. 2 is a schematic diagram illustrating a process of separating a replacement target portion according to the first embodiment. 第１実施形態の交換対象部分を分離する過程を示す概略図FIG. 2 is a schematic diagram illustrating a process of separating a replacement target portion according to the first embodiment. 第１実施形態の交換用パネル部分を装着する過程を示す概略図FIG. 2 is a schematic view showing a process of mounting the replacement panel portion of the first embodiment. 第１実施形態の交換用パネル部分を装着した状態を示す概略図FIG. 2 is a schematic view showing a state in which a replacement panel portion according to the first embodiment is mounted. 第２実施形態の交換対象部分を分離する過程を示す概略図Schematic diagram showing a process of separating a replacement target portion according to the second embodiment. 第２実施形態の交換対象部分を分離する過程を示す概略図Schematic diagram showing a process of separating a replacement target portion according to the second embodiment. 第２実施形態の交換用パネル部分を装着する過程を示す概略図Schematic showing the process of mounting the replacement panel portion of the second embodiment. 第２実施形態の交換用パネル部分を装着した状態を示す概略図FIG. 4 is a schematic diagram showing a state where a replacement panel portion according to the second embodiment is mounted. 第３実施形態の交換対象部分を分離する過程を示す概略図Schematic diagram showing a process of separating a replacement target portion according to the third embodiment. 第３実施形態の交換対象部分を分離する過程を示す概略図Schematic diagram showing a process of separating a replacement target portion according to the third embodiment. 第３実施形態の交換用パネル部分を装着する過程を示す概略図Schematic showing the process of mounting the replacement panel portion of the third embodiment. 第３実施形態の交換用パネル部分を装着した状態を示す概略図The schematic diagram which shows the state which attached the replacement panel part of 3rd Embodiment. 第４実施形態の交換対象下部寄せ部分を示す概略平面図FIG. 4 is a schematic plan view showing a replacement target lower portion of the fourth embodiment. 第４実施形態の下部管寄せに対する流体流動形態を示す概略図Schematic showing the fluid flow pattern for the lower header in the fourth embodiment. 第４実施形態の交換対象下部寄せ部分の分離後状態を示す概略平面図FIG. 4 is a schematic plan view showing a state after separation of a replacement target lower portion according to a fourth embodiment. 第４実施形態の交換対象下部寄せ部分の装着前状態を示す概略平面図FIG. 14 is a schematic plan view showing a state before attachment of a lower part to be replaced according to a fourth embodiment; 第４実施形態の交換対象下部寄せ部分の分離後状態を示す概略側面図The schematic side view which shows the state after separation of the replacement target lower approach part of 4th Embodiment. 第４実施形態の交換対象下部寄せ部分の装着状態を示す概略側面図The schematic side view which shows the mounting condition of the replacement target lower approach part of 4th Embodiment. 排熱回収ボイラの従来例を示す一部切欠概略斜視図Partial notch schematic perspective view showing a conventional example of an exhaust heat recovery boiler

〔第１実施形態〕
以下、本発明の第１実施形態を図面に基づいて説明する。
（排熱回収ボイラの全体構成）
図１に示すように、排熱回収ボイラには、ガスタービンＧＴの排ガスを流動させる煙道を形成するダクト状のボイラケーシングＫが設けられ、ボイラケーシングＫの内部には、複数の熱交換パネルユニットＮが、排ガス流動方向に沿って並ぶ形態で設けられ、ボイラケーシングＫの天井部には、低圧蒸気ドラムＤ１、中圧蒸気ドラムＤ２、及び、高圧蒸気ドラムＤ３が設けられている。 [First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
(Overall configuration of waste heat recovery boiler)
As shown in FIG. 1, the exhaust heat recovery boiler is provided with a duct-like boiler casing K that forms a flue for flowing exhaust gas of the gas turbine GT, and a plurality of heat exchange panels are provided inside the boiler casing K. The units N are arranged in a line along the flow direction of the exhaust gas, and a low-pressure steam drum D1, a medium-pressure steam drum D2, and a high-pressure steam drum D3 are provided on the ceiling of the boiler casing K.

本実施形態においては、ガスタービンＧＴの排ガスの流動方向に沿って９つの熱交換パネルユニットＮが並置されている。
熱交換パネルユニットＮの夫々は、図３及び図４に示すように、複数の熱交換パネルＰ（図２参照）をガスタービンの排ガス流動方向に沿って密接状態に並べる形態に構成されている。 In the present embodiment, nine heat exchange panel units N are juxtaposed along the flow direction of the exhaust gas of the gas turbine GT.
As shown in FIGS. 3 and 4, each of the heat exchange panel units N is configured in such a manner that a plurality of heat exchange panels P (see FIG. 2) are closely arranged along the exhaust gas flow direction of the gas turbine. .

排ガスの流動方向において２番目に位置する第２熱交換パネルユニットＮ２と３番目に位置する第３熱交換パネルユニットＮ３の間には、排ガス中の窒素酸化物を還元するための脱硝装置Ｍが設けられている。   A denitration device M for reducing nitrogen oxides in the exhaust gas is provided between the second heat exchange panel unit N2 located second in the flow direction of the exhaust gas and the third heat exchange panel unit N3 located third in the exhaust gas flow direction. Is provided.

ちなみに、図３に示すように、複数の熱交換パネルユニットＮが、排ガス流動方向に沿って間隔を隔てて並設されて、隣接する熱交換パネルユニットＮの間には、作業者がボイラケーシングＫの床部Ｋｔを歩行用通路とする状態で、点検や補修のために進入する作業空間Ｓが形成されている。
尚、ボイラケーシングＫの側壁には、作業空間Ｓに対応させる状態でマンホールＦが形成されており、このマンホールＦを通して、作業者が作業空間Ｓに出入りできるように構成されている。 Incidentally, as shown in FIG. 3, a plurality of heat exchange panel units N are juxtaposed at intervals along the exhaust gas flow direction, and a worker operates a boiler casing between adjacent heat exchange panel units N. In the state where the floor Kt of K is used as a walking path, a work space S is formed to enter for inspection and repair.
In addition, a manhole F is formed on the side wall of the boiler casing K so as to correspond to the work space S, and the worker can enter and exit the work space S through the manhole F.

複数の熱交換パネルユニットＮのうちの、排ガスの流動方向において１番目に位置する第１熱交換パネルユニットＮ１は、高圧蒸気用の過熱器や再熱器を形成するように構成され、排ガスの流動方向において２番目に位置する第２熱交換パネルユニットＮ２は、高圧蒸発器を形成するように構成されている。   Of the plurality of heat exchange panel units N, the first heat exchange panel unit N1 located first in the flow direction of the exhaust gas is configured to form a superheater or a reheater for high-pressure steam, and The second heat exchange panel unit N2 located second in the flow direction is configured to form a high-pressure evaporator.

図３に示すように、排ガス流動方向において３番目に位置する第３熱交換パネルユニットＮ３は、高圧蒸発器、及び、過熱器を形成するように構成されている。
排ガス流動方向において４番目に位置する第４熱交換パネルユニットＮ４は、高圧節炭器、及び、過熱器を形成するように構成されている。
排ガス流動方向において５番目に位置する第５熱交換パネルユニットＮ５は、蒸発器を形成するように構成されている。 As shown in FIG. 3, the third heat exchange panel unit N3 located third in the exhaust gas flow direction is configured to form a high-pressure evaporator and a superheater.
The fourth heat exchange panel unit N4 located fourth in the exhaust gas flow direction is configured to form a high-pressure economizer and a superheater.
The fifth heat exchange panel unit N5 located fifth in the exhaust gas flow direction is configured to form an evaporator.

排ガス流動方向において６番目に位置する第６熱交換パネルユニットＮ６は、高圧節炭器、中圧節炭器、及び、高圧節炭器を形成するように構成されている（図５参照）。
排ガス流動方向において７番目に位置する第７熱交換パネルユニットＮ７は、蒸発器、及び、高圧節炭器を形成するように構成されている。
排ガス流動方向において８番目に位置する第８熱交換パネルユニットＮ８は、中圧節炭器、及び、高圧節炭器として機能するように構成されている。 The sixth heat exchange panel unit N6 located sixth in the exhaust gas flow direction is configured to form a high-pressure economizer, a medium-pressure economizer, and a high-pressure economizer (see FIG. 5).
The seventh heat exchange panel unit N7 located seventh in the exhaust gas flow direction is configured to form an evaporator and a high-pressure economizer.
The eighth heat exchange panel unit N8 located eighth in the exhaust gas flow direction is configured to function as a medium-pressure economizer and a high-pressure economizer.

したがって、本実施形態の排熱回収ボイラは、低圧蒸気ドラムＤ１の内部に低圧の蒸気を生成して、低圧蒸気ドラムＤ１の低圧の蒸気を低圧過熱器にて過熱して外部の熱消費機器に供給し、中圧蒸気ドラムＤ２の内部に中圧の蒸気を生成して、中圧蒸気ドラムＤ２の中圧の蒸気を中圧過熱器にて過熱して外部の熱消費機器に供給し、さらに、高圧蒸気ドラムＤ３の内部に高圧の蒸気を生成して、高圧蒸気ドラムＤ３の高圧の蒸気を高圧蒸気用の過熱器にて過熱して蒸気タービン（図示せず）に供給するように構成されている。   Therefore, the exhaust heat recovery boiler of the present embodiment generates low-pressure steam inside the low-pressure steam drum D1, superheats the low-pressure steam of the low-pressure steam drum D1 with the low-pressure superheater, and supplies the heat to the external heat consuming device. Supply, generate medium-pressure steam inside the medium-pressure steam drum D2, superheat the medium-pressure steam in the medium-pressure steam drum D2 with a medium-pressure superheater, and supply it to an external heat consuming device. Is configured to generate high-pressure steam inside the high-pressure steam drum D3, superheat the high-pressure steam in the high-pressure steam drum D3 with a superheater for high-pressure steam, and supply it to a steam turbine (not shown). ing.

つまり、本実施形態の排熱回収ボイラは、コンバインドサイクル発電プラントに装備されて、発電用のガスタービンＧＴと一体回転するように接続された蒸気タービン（図示せず）を駆動する高圧の過熱蒸気を生成し、また、温水器等の熱消費機器に供給する中圧や低圧の過熱蒸気を生成するように構成されている。   That is, the exhaust heat recovery boiler of the present embodiment is provided in a combined cycle power plant, and drives a high-pressure superheated steam that drives a steam turbine (not shown) connected to rotate integrally with a gas turbine GT for power generation. And a medium-pressure or low-pressure superheated steam to be supplied to a heat consuming device such as a water heater.

（熱交換パネルの構成）
図２に示すように、熱交換パネルＰは、平行状に位置する上部管寄せ１と下部管寄せ２との管軸心方向に沿って並ぶ複数の伝熱管３（図４参照）を、上部管寄せ１と下部管寄せ２との間に接続する形態に構成されている。
伝熱管３における下端部及び上端部を除いた中間部の外周部には、螺旋板状等の伝熱フィン３ａが装着されて、伝熱効率を向上させるように構成されている。 (Composition of heat exchange panel)
As shown in FIG. 2, the heat exchange panel P includes a plurality of heat transfer tubes 3 (see FIG. 4) arranged in parallel along an axial direction of an upper header 1 and a lower header 2 positioned in parallel. It is configured to be connected between the header 1 and the lower header 2.
A helical plate-like heat transfer fin 3a is attached to the outer peripheral portion of the heat transfer tube 3 except for the lower end portion and the upper end portion, so as to improve heat transfer efficiency.

図３及び図４に示すように、本実施形態においては、上部管寄せ１と下部管寄せ２との管軸心方向に沿って並ぶ複数の伝熱管３が、ガスタービンＧＴの排ガス流動方向の上手側に偏位する上手側偏位状態と排ガス流動方向の下手側に偏位する下手側偏位状態とに、管軸心方向に沿って交互に設置されている。
ちなみに、本実施形態においては、８０本程度の伝熱管３を、管軸心方向に沿って並置するように構成されている。 As shown in FIGS. 3 and 4, in the present embodiment, a plurality of heat transfer tubes 3 arranged along the tube axis direction of the upper header 1 and the lower header 2 are arranged in the exhaust gas flow direction of the gas turbine GT. It is alternately arranged along the pipe axis direction into a superior side deflected state deviating to the superior side and a lower side deviated state deviated to the lower side in the exhaust gas flow direction.
Incidentally, in the present embodiment, about 80 heat transfer tubes 3 are configured to be juxtaposed along the tube axis direction.

尚、図３に示すように、第３熱交換パネルユニットＮ３の過熱器及び第４熱交換パネルユニットＮ４の過熱器を構成する熱交換パネルＰについては、詳細な図示は省略するが、上部管寄せ１と下部管寄せ２との管軸心方向に沿って並ぶ複数の伝熱管３が、ガスタービンＧＴの排ガス流動方向において同じ位置に位置する状態で並ぶように構成されている。   As shown in FIG. 3, the heat exchange panel P constituting the superheater of the third heat exchange panel unit N3 and the superheater of the fourth heat exchange panel unit N4 is not shown in detail, but the upper pipe is omitted. A plurality of heat transfer tubes 3 arranged along the tube axis direction of the header 1 and the lower header 2 are arranged so as to be located at the same position in the exhaust gas flow direction of the gas turbine GT.

また、図２に示すように、下部管寄せ２には、伝熱管３の下端部を挿入させる接続孔４が形成され、伝熱管３の下端部が、下部管寄せ２に形成した接続孔４に挿入した状態において、下部管寄せ２における接続孔４の周縁部と伝熱管３の表面部とを溶接する、いわゆる差し込み溶接にて下部管寄せ２に接続されている。
尚、詳細な図示は省略するが、伝熱管３の上端部も、下端部と同様に、差し込み溶接にて上部管寄せ１に接続されている。 As shown in FIG. 2, a connection hole 4 for inserting a lower end of the heat transfer tube 3 is formed in the lower header 2, and a lower end of the heat transfer tube 3 is connected to the connection hole 4 formed in the lower header 2. Is connected to the lower header 2 by so-called insertion welding, in which the peripheral portion of the connection hole 4 in the lower header 2 and the surface of the heat transfer tube 3 are welded.
Although not shown in detail, the upper end of the heat transfer tube 3 is also connected to the upper header 1 by insertion welding similarly to the lower end.

ちなみに、本実施形態においては、上部管寄せ１と下部管寄せ２との間隔は、３０ｍ程度であり、上部管寄せ１及び下部管寄せ２は、直径が２００ｍｍ程度で、肉厚が２０〜２５ｍｍ程度のパイプを用いて構成され、伝熱管３は、直径が３０〜４０ｍｍ程度で、肉厚が３ｍｍ程度のパイプを用いて構成されている。   Incidentally, in this embodiment, the distance between the upper header 1 and the lower header 2 is about 30 m, and the upper header 1 and the lower header 2 have a diameter of about 200 mm and a thickness of 20 to 25 mm. The heat transfer tube 3 has a diameter of about 30 to 40 mm and a wall thickness of about 3 mm.

そして、熱交換パネルＰは、上述の記載からも明らか如く、熱交換パネルユニットＮを形成するようにガスタービンＧＴの排ガス流動方向に並ぶ状態で、ボイラケーシングＫの内部に配設されることになる。   As is clear from the above description, the heat exchange panel P is disposed inside the boiler casing K in a state of being arranged in the exhaust gas flow direction of the gas turbine GT so as to form the heat exchange panel unit N. Become.

具体的には、熱交換パネルＰは、上部管寄せ１をボイラケーシングＫの天井部に対して吊下げ支持し、かつ、下部管寄せ２を弾性伸縮式の受け台にて載置支持する支持形態で設けられている。
熱交換パネルＰの上部管寄せ１をボイラケーシングＫの天井部に対して吊下げ支持する構成や、下部管寄せ２を弾性伸縮式の受け台にて載置支持する構成は周知であるので、本実施形態においては、熱交換パネルＰの支持構成についての詳細な説明は省略する。 Specifically, the heat exchange panel P suspends and supports the upper header 1 with respect to the ceiling of the boiler casing K, and supports the lower header 2 by placing and supporting the same on an elastically expandable cradle. It is provided in the form.
The configuration in which the upper header 1 of the heat exchange panel P is suspended and supported with respect to the ceiling of the boiler casing K and the configuration in which the lower header 2 is placed and supported by an elastically expandable and susceptible base are well known. In the present embodiment, a detailed description of the configuration for supporting the heat exchange panel P is omitted.

（排熱回収ボイラの補修方法）
次に、排熱回収ボイラの補修方法について、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修する場合について説明する。
尚、他の熱交換パネルユニットＮにおける熱交換パネルＰの補修も同様に行えるものである。 (How to repair the waste heat recovery boiler)
Next, a method for repairing the exhaust heat recovery boiler will be described for a case where three heat exchange panels P forming a high-pressure economizer in the sixth heat exchange panel unit N6 are repaired.
The repair of the heat exchange panel P in the other heat exchange panel unit N can be similarly performed.

高圧節炭器を形成する３枚の熱交換パネルＰは、図３に示すように、第６熱交換パネルユニットＮ６の排ガス流動方向の下手側部分に位置するものであるから、高圧節炭器を形成する３枚の熱交換パネルＰの補修作業は、第６熱交換パネルユニットＮ６の排ガス流動方向の下手側の作業空間Ｓにて行うことになる。   As shown in FIG. 3, the three heat exchange panels P forming the high-pressure economizer are located on the lower side of the sixth heat exchange panel unit N6 in the exhaust gas flow direction. Is performed in the work space S on the lower side in the exhaust gas flow direction of the sixth heat exchange panel unit N6.

したがって、第６熱交換パネルユニットＮ６の排ガス流動方向の下手側の作業空間Ｓに位置する作業者による、高圧節炭器を形成する３枚の熱交換パネルＰに対する作業方向は、排ガス流動方向の下手側から上流側に向かう方向となる。   Therefore, the working direction of the three heat exchange panels P forming the high-pressure economizer by the worker located in the work space S on the lower side in the exhaust gas flow direction of the sixth heat exchange panel unit N6 is in the exhaust gas flow direction. The direction is from the lower side to the upstream side.

ちなみに、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修する必要があるか否かの判断は、高圧節炭器を形成する３枚の熱交換パネルＰのうちで、排ガス流動方向において最も下手側となる熱交換パネルＰの複数の伝熱管３の肉厚を、作業空間Ｓに位置する作業者が超音波センサ等により計測して、複数の伝熱管３のうちのいずれかの伝熱管３の肉厚が設定基準値以下になると、補修を行うタイミングであると判断することになる。   Incidentally, whether or not it is necessary to repair the three heat exchange panels P forming the high-pressure economizer in the sixth heat exchange panel unit N6 is determined by the three heat exchange panels forming the high-pressure economizer. Among the P, the thickness of the plurality of heat transfer tubes 3 of the heat exchange panel P, which is the lowermost side in the exhaust gas flow direction, is measured by an ultrasonic sensor or the like by an operator located in the work space S, and When the thickness of any one of the heat transfer tubes 3 becomes equal to or less than the set reference value, it is determined that it is time to perform repair.

尚、高圧節炭器を形成する３枚の熱交換パネルＰのうちで、排ガス流動方向において最も下手側となる熱交換パネルＰの伝熱管３の肉厚が、例えば、流れ加速腐食により、設定基準以下になった場合には、他の熱交換パネルＰの伝熱管３の肉厚は、設定基準値以下であるとは限らないものの、設定基準値に近い厚さであることが推察できるため、高圧節炭器を形成する３枚の熱交換パネルＰを一挙に補修することになる。   In addition, among the three heat exchange panels P forming the high-pressure economizer, the thickness of the heat transfer tube 3 of the heat exchange panel P which is the lowest in the exhaust gas flow direction is set, for example, by flow accelerated corrosion. When the heat transfer panel 3 falls below the reference, the thickness of the heat transfer tubes 3 of the other heat exchange panels P is not necessarily less than the set reference, but it can be inferred that the thickness is close to the set reference. Thus, the three heat exchange panels P forming the high pressure economizer are repaired at once.

ちなみに、ここでは流れ加速腐食について例示したが、腐食の形態としては、エロージョンコロージョンン、孔食、粒界腐食、すきま腐食、応力腐食割れなども挙げられる。   Incidentally, although the flow accelerated corrosion has been exemplified here, examples of the form of corrosion include erosion corrosion, pitting corrosion, intergranular corrosion, crevice corrosion, stress corrosion cracking, and the like.

本実施形態の補修方法は、図６〜図９に示すように、熱交換パネルＰの下部管寄せ２に対応する交換用下部管寄せ２Ｚと複数の伝熱管３の下方側の交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚとを備える形態に製作した交換用パネル部分ＰＺを予め準備しておく。   As shown in FIGS. 6 to 9, the repair method according to the present embodiment includes a replacement lower header 2 </ b> Z corresponding to the lower header 2 of the heat exchange panel P and a replacement target portion 3 </ b> W on the lower side of the plurality of heat transfer tubes 3. A replacement panel portion PZ manufactured in a form including a replacement heat transfer tube portion 3Z corresponding to the above is prepared in advance.

つまり、工場等の作業空間が広い作業箇所において、たとえば製作用の位置決め冶具等を用いるようにしながら、複数の交換用伝熱管部分３Ｚを交換用下部管寄せ２Ｚに差し込み溶接して、交換用パネル部分ＰＺを予め製作して準備しておく。   In other words, in a work place such as a factory where a work space is wide, a plurality of replacement heat transfer tube portions 3Z are inserted into the replacement lower header 2Z and welded while using, for example, a positioning jig for manufacturing. The part PZ is manufactured and prepared in advance.

そして、図６及び図７に示すように、熱交換パネルＰの複数の伝熱管３を、交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する。
その後、図８及び図９に示すように、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３おける交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。 Then, as shown in FIGS. 6 and 7, the plurality of heat transfer tubes 3 of the heat exchange panel P are cut so as to separate the replacement target portion 3W, and the lower header 2 and the heat transfer tubes 3 of the heat exchange panel P are cut off. The exchange target portion 3W is separated.
Then, as shown in FIGS. 8 and 9, the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ is welded to the lower end of the upper side tube portion 3U of the heat transfer tube 3 from which the replacement target portion 3W is cut off. Then, the replacement panel portion PZ is mounted on the heat exchange panel P.

そして、本実施形態においては、排ガス流動方向に沿って密接状態に並設される５枚の熱交換パネルＰのうちの、高圧節炭器を形成する３枚の熱交換パネルＰを補修するものであるため、具体的には、次の如く行うことになる。   In the present embodiment, of the five heat exchange panels P arranged side by side closely in the exhaust gas flow direction, three heat exchange panels P forming a high-pressure economizer are repaired. Therefore, specifically, it is performed as follows.

すなわち、第６熱交換パネルユニットＮ６の密接状態に並ぶ５枚の熱交換パネルＰのうちで、並び方向の一端側から他端側に向かう３枚の熱交換パネルＰを交換対象の熱交換パネルＰとする。
そして、図６及び図７に示すように、それら交換対象の熱交換パネルＰのうちの一端側（排ガス流動方向の下流側）の熱交換パネルＰから他端側（排ガス流動方向の上流側）の熱交換パネルＰに向けて、順次、複数の伝熱管３を、交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する。 That is, of the five heat exchange panels P arranged in close contact with the sixth heat exchange panel unit N6, the three heat exchange panels P going from one end side to the other end side in the arrangement direction are the heat exchange panels to be exchanged. P.
Then, as shown in FIGS. 6 and 7, one end side (downstream side in the exhaust gas flow direction) of the heat exchange panels P to be exchanged is connected to the other end side (upstream side in the exhaust gas flow direction). A plurality of heat transfer tubes 3 are sequentially cut so as to cut off the portion 3W to be replaced, and the lower header 2 of the heat exchange panel P and the portion 3W to be replaced of the heat transfer tube 3 are separated. I do.

尚、並び方向の一端側の熱交換パネルＰとは、排ガス流動方向において最も下流側に位置する熱交換パネルＰであり、一端側から他端側に向かう方向とは、上述した作業方向に対応する方向である。   The heat exchange panel P at one end in the arrangement direction is the heat exchange panel P located at the most downstream side in the exhaust gas flow direction, and the direction from one end to the other end corresponds to the working direction described above. Direction.

熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離した後は、図８及び図９に示すように、３枚の交換対象の熱交換パネルＰのうちの他端側の熱交換パネルＰから一端側の熱交換パネルＰに向けて、順次、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３における交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。   After separating the lower header 2 of the heat exchange panel P and the replacement target portion 3W of the heat transfer tube 3, as shown in FIGS. 8 and 9, the other end side of the three heat exchange panels P to be replaced. From the heat exchange panel P to the heat exchange panel P on one end side, the upper end of the exchange heat transfer tube portion 3Z of the exchange panel portion PZ is sequentially connected to the upper side tube from which the exchange target portion 3W of the heat transfer tube 3 is cut off. The replacement panel portion PZ is attached to the heat exchange panel P by welding to the lower end of the portion 3U.

そして、本実施形態においては、３枚の交換対象の熱交換パネルＰにおける伝熱管３の交換対象部分３Ｗの長さが同じ長さに設定されている。
したがって、複数の交換対象の熱交換パネルＰの夫々に装着する交換用パネル部分ＰＺにおける交換用伝熱管部分３Ｚの長さが同じになるから、交換用パネル部分ＰＺを、３枚の交換対象の熱交換パネルＰについて共用できるものとなるため、３枚の交換対象の熱交換パネルＰについて、一つの仕様の交換用パネル部分ＰＺを製作することになる。 In the present embodiment, the lengths of the replacement portions 3W of the heat transfer tubes 3 in the three heat exchange panels P to be replaced are set to the same length.
Therefore, since the length of the replacement heat transfer tube portion 3Z in the replacement panel portion PZ attached to each of the plurality of heat exchange panels P to be replaced becomes the same, the replacement panel portion PZ is replaced with three replacement target heat exchange panels P. Since the heat exchange panel P can be shared, the exchange panel portion PZ having one specification is manufactured for the three heat exchange panels P to be exchanged.

ちなみに、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する際には、図６及び図７に示すように、伝熱管３の切断箇所の上方に位置する上方側管部分３Ｕにおける伝熱フィン３ａのうちで、伝熱管３の切断箇所の上方側の設定範囲Ｈ（図５参照）の伝熱フィン３ａを除去することになる。   Incidentally, when separating the lower header 2 of the heat exchange panel P and the exchange target portion 3W of the heat transfer tube 3, as shown in FIGS. 6 and 7, the upper side located above the cut portion of the heat transfer tube 3. Of the heat transfer fins 3a in the tube portion 3U, the heat transfer fins 3a in the set range H (see FIG. 5) above the cut portion of the heat transfer tube 3 are removed.

このように伝熱フィン３ａを除去することにより、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３における交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接する際に、伝熱フィン３ａが邪魔になることを回避できることになる。   By removing the heat transfer fins 3a in this manner, the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ is moved to the lower end of the upper side tube portion 3U of the heat transfer tube 3 from which the replacement target portion 3W is cut off. When welding, the heat transfer fins 3a can be prevented from being in the way.

尚、伝熱フィン３ａを除去するタイミングは、伝熱管３の交換対象部分３Ｗを切り離す状態に切断する切断処理を行う前で良いが、伝熱管３の交換対象部分３Ｗを切り離す状態に切断する切断処理を行った後でも良い。   Note that the heat transfer fins 3a may be removed before the cutting process for cutting the replacement portion 3W of the heat transfer tube 3 is performed, but the cutting for cutting the replacement portion 3W of the heat transfer tube 3 may be performed. It may be after the processing.

（第１実施形態のまとめ）
本実施形態の排熱回収ボイラの補修方法は、予め、熱交換パネルＰの下部管寄せ２に対応する交換用下部管寄せ２Ｚと複数の伝熱管３の下方側の交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚとを備える形態に製作した交換用パネル部分ＰＺを準備しておき、この交換用パネル部分ＰＺを、交換対象の熱交換パネルＰに装着するものであるから、補修作業の容易化を図ることができる。 (Summary of First Embodiment)
The repair method of the exhaust heat recovery boiler according to the present embodiment corresponds to the replacement lower header 2Z corresponding to the lower header 2 of the heat exchange panel P and the replacement target portion 3W on the lower side of the plurality of heat transfer tubes 3 in advance. A replacement panel portion PZ manufactured in a form including the replacement heat transfer tube portion 3Z is prepared, and the replacement panel portion PZ is mounted on the heat exchange panel P to be replaced. It can be facilitated.

すなわち、伝熱管３の下方側部分に流れ加速腐食が発生して、熱交換パネルＰを補修する際には、先ず、熱交換パネルＰの複数の伝熱管３を、当該伝熱管３の下方側の交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離し、その後、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３おける交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。   That is, when the accelerated corrosion occurs in the lower portion of the heat transfer tube 3 and the heat exchange panel P is repaired, first, the plurality of heat transfer tubes 3 of the heat exchange panel P are moved to the lower side of the heat transfer tube 3. Of the heat exchange panel P and the exchange target portion 3W of the heat transfer tube 3 are separated, and then the exchange heat transfer tube portion 3Z of the exchange panel portion PZ is cut off. The upper end portion is welded to the lower end portion of the upper side tube portion 3U from which the replacement target portion 3W of the heat transfer tube 3 is cut off, and the replacement panel portion PZ is mounted on the heat exchange panel P.

したがって、熱交換パネルＰを補修する際に、伝熱管３の下方側部分（交換対象部分３Ｗ）の下端部を下部管寄せ２から分離する作業や、交換用伝熱管部分３Ｚの下端部を下部管寄せ２に差し込み溶接する作業が不要となるため、熱交換パネルＰの補修作業を容易に行うことができる。   Therefore, when repairing the heat exchange panel P, the lower end of the lower part of the heat transfer tube 3 (the replacement target portion 3W) is separated from the lower header 2 or the lower end of the replacement heat transfer tube 3Z is moved downward. Since the work of inserting and welding to the header 2 becomes unnecessary, the repair work of the heat exchange panel P can be easily performed.

ちなみに、交換用パネル部分ＰＺを製作するには、交換用伝熱管部分３Ｚの下端部を交換用下部管寄せ２Ｚに対して差し込み溶接することになるが、交換用パネル部分ＰＺの製作は、工場内等の広い空間において、位置決め冶具等を用いながら行うことができるため、交換用伝熱管部分３Ｚの下端部を交換用下部管寄せ２Ｚに対して差し込み溶接する作業も良好に行うことができる。   Incidentally, in order to manufacture the replacement panel portion PZ, the lower end portion of the replacement heat transfer tube portion 3Z is to be inserted and welded to the replacement lower header 2Z, but the replacement panel portion PZ is manufactured by a factory. Since it can be performed in a large space such as inside using a positioning jig or the like, the work of inserting and welding the lower end of the replacement heat transfer tube portion 3Z to the replacement lower header 2Z can be performed well.

また、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修するにあたり、３枚の交換対象の熱交換パネルＰにおける伝熱管３の交換対象部分３Ｗの長さが同じであるから、３枚の交換対象の熱交換パネルＰの夫々に装着する交換用パネル部分ＰＺにおける交換用伝熱管部分３Ｚの長さが同じになる。   In repairing the three heat exchange panels P forming the high-pressure economizer in the sixth heat exchange panel unit N6, the length of the exchange target portion 3W of the heat transfer tube 3 in the three heat exchange panels P to be exchanged is set. Are the same, the length of the replacement heat transfer tube portion 3Z in the replacement panel portion PZ attached to each of the three heat exchange panels P to be replaced is the same.

したがって、交換用パネル部分ＰＺを、３枚の交換対象の熱交換パネルＰについて共用できるものとなるから、３枚の交換対象の熱交換パネルＰについて、一つの仕様の交換用パネル部分ＰＺを製作すれば良いため、交換用パネル部分ＰＺの製作が容易になる。   Therefore, the replacement panel portion PZ can be shared for the three heat exchange panels P to be replaced, so that the replacement panel portion PZ of one specification is manufactured for the three heat exchange panels P to be replaced. The replacement panel portion PZ can be easily manufactured.

〔第２実施形態〕
次に、第２実施形態を説明するが、この第２実施形態は、排熱回収ボイラの補修方法の別実施形態を示すものであって、排熱回収ボイラの具体構成は第１実施形態と同様であるので、以下、第１実施形態と異なる部分を詳述して、第１実施形態と同じ部分には、同じ符号を付して、詳細な説明を省略する。 [Second embodiment]
Next, a second embodiment will be described. The second embodiment shows another embodiment of a method for repairing an exhaust heat recovery boiler. The specific configuration of the exhaust heat recovery boiler is the same as that of the first embodiment. Therefore, portions different from the first embodiment will be described in detail below, and the same portions as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

第２実施形態の排熱回収ボイラの補修方法を、第１実施形態と同様に、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修する場合について説明する。   The method of repairing the exhaust heat recovery boiler of the second embodiment will be described for the case of repairing three heat exchange panels P forming a high pressure economizer in the sixth heat exchange panel unit N6, as in the first embodiment. I do.

図１０〜図１３に示す如く、第１実施形態と同様に、熱交換パネルＰの下部管寄せ２に対応する交換用下部管寄せ２Ｚと複数の伝熱管３の下方側の交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚとを備える形態に製作した交換用パネル部分ＰＺを予め準備し、この交換用パネル部分ＰＺを、交換対象の熱交換パネルＰに装着する。   As shown in FIGS. 10 to 13, similarly to the first embodiment, the replacement lower header 2 </ b> Z corresponding to the lower header 2 of the heat exchange panel P and the replacement target portion 3 </ b> W on the lower side of the plurality of heat transfer tubes 3. A replacement panel portion PZ manufactured in a form including the corresponding replacement heat transfer tube portion 3Z is prepared in advance, and the replacement panel portion PZ is mounted on the heat exchange panel P to be replaced.

つまり、図１０及び図１１に示すように、熱交換パネルＰの複数の伝熱管３を、交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する。
その後、図１２及び図１３に示すように、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３おける交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。 That is, as shown in FIGS. 10 and 11, the plurality of heat transfer tubes 3 of the heat exchange panel P are cut so as to separate the replacement target portion 3W, and the lower header 2 and the heat transfer tubes 3 of the heat exchange panel P are cut off. The exchange target portion 3W is separated.
Thereafter, as shown in FIGS. 12 and 13, the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ is welded to the lower end of the upper tube portion 3U of the heat transfer tube 3 from which the replacement target portion 3W is cut off. Then, the replacement panel portion PZ is mounted on the heat exchange panel P.

また、第２実施形態においても、排ガス流動方向に沿って密接状態に並設される５枚の熱交換パネルＰのうちの、高圧節炭器を形成する３枚の熱交換パネルＰを補修するものであるから、第６熱交換パネルユニットＮ６の密接状態に並ぶ５枚の熱交換パネルＰのうちで、並び方向の一端側から他端側に向かう３枚の熱交換パネルＰを交換対象の熱交換パネルＰとする。   Also in the second embodiment, of the five heat exchange panels P juxtaposed in the exhaust gas flow direction, three heat exchange panels P forming the high-pressure economizer are repaired. Therefore, among the five heat exchange panels P arranged in close contact with each other in the sixth heat exchange panel unit N6, three heat exchange panels P from one end side to the other end side in the arrangement direction are replaced. The heat exchange panel P is used.

そして、図１０及び図１１に示すように、それら交換対象の熱交換パネルＰのうちの一端側の熱交換パネルＰから他端側の熱交換パネルＰに向けて、順次、複数の伝熱管３を、交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する。   Then, as shown in FIGS. 10 and 11, a plurality of heat transfer tubes 3 are sequentially arranged from the heat exchange panel P on one end of the heat exchange panels P to be exchanged to the heat exchange panel P on the other end. Of the heat exchange panel P, and the exchange target portion 3W of the heat transfer tube 3 are separated.

熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離した後は、図１２及び図１３に示すように、３枚の交換対象の熱交換パネルＰのうちの他端側の熱交換パネルＰから一端側の熱交換パネルＰに向けて、順次、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３おける交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。   After the lower header 2 of the heat exchange panel P and the exchange target portion 3W of the heat transfer tube 3 are separated, the other end of the three heat exchange panels P to be exchanged as shown in FIGS. From the heat exchange panel P to the heat exchange panel P on one end side, the upper side pipe in which the replacement target portion 3W of the heat transfer tube 3 is cut off at the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ. The replacement panel portion PZ is attached to the heat exchange panel P by welding to the lower end of the portion 3U.

そして、本第２実施形態においては、交換対象の熱交換パネルＰにおける上手側偏位状態の伝熱管３と下手側偏位状態の伝熱管３のうちの、交換対象の熱交換パネルＰの並び方向の一端側（排ガス流動方向の下流側）となる伝熱管３の交換対象部分３Ｗの長さを、交換対象の熱交換パネルＰの並び方向の他端側（排ガス流動方向の上流側）となる伝熱管３の交換対象部分３Ｗの長さよりも長く設定する。   In the second embodiment, the heat exchange panels P to be exchanged among the heat exchange tubes 3 in the upper-side offset state and the heat transfer tubes 3 in the lower-side offset state in the heat exchange panel P to be exchanged. The length of the exchange target portion 3W of the heat transfer tube 3 which is one end side (downstream side in the exhaust gas flow direction) of the direction is set to the other end side (upstream side in the exhaust gas flow direction) of the arrangement direction of the heat exchange panels P to be exchanged. Is set longer than the length of the replacement target portion 3W of the heat transfer tube 3.

加えて、３枚の交換対象の熱交換パネルＰにおける上手側偏位状態の伝熱管３の交換対象部分３Ｗの長さを同じにしかつ３枚の交換対象の熱交換パネルＰにおける下手側偏位状態の伝熱管３の交換対象部分３Ｗの長さを同じに設定する。   In addition, the lengths of the exchange target portions 3W of the heat transfer tubes 3 in the upwardly displaced state of the three heat exchange panels P to be exchanged are made the same, and the downward deviations of the three heat exchange panels P to be exchanged are changed. The length of the exchange target portion 3W of the heat transfer tube 3 in the state is set to be the same.

（第２実施形態のまとめ）
第２実施形態の排熱回収ボイラの補修方法は、第１実施形態の排熱回収ボイラの補修方法と同様に、熱交換パネルＰの下部管寄せ２に対応する交換用下部管寄せ２Ｚと複数の伝熱管３の下方側の交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚとを備える形態に製作した交換用パネル部分ＰＺを準備しておき、この予め準備した交換用パネル部分ＰＺを、交換対象の熱交換パネルＰに装着するものであるから、補修作業の容易化を図ることができる。 (Summary of Second Embodiment)
The repair method of the exhaust heat recovery boiler of the second embodiment includes a replacement lower header 2Z corresponding to the lower header 2 of the heat exchange panel P and a plurality of replacement headers, similarly to the repair method of the exhaust heat recovery boiler of the first embodiment. The replacement panel portion PZ manufactured in a form including a replacement heat transfer tube portion 3Z corresponding to the replacement target portion 3W on the lower side of the heat transfer tube 3 is prepared, and the prepared replacement panel portion PZ is prepared. Since it is mounted on the heat exchange panel P to be replaced, repair work can be facilitated.

そして、本第２実施形態においては、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修するにあたり、交換対象の熱交換パネルＰにおける上手側偏位状態の伝熱管３と下手側偏位状態の伝熱管３のうちの、３枚の交換対象の熱交換パネルＰの並び方向の一端側（排ガス流動方向の下流側）となる伝熱管３の交換対象部分３Ｗの長さを、３枚の交換対象の熱交換パネルＰの並び方向の他端側（排ガス流動方向の上流側）となる伝熱管３の交換対象部分３Ｗの長さよりも長くするものであるから、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３における交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接する際に、その溶接作業の作業性を向上することができる。   In the second embodiment, when the three heat exchange panels P forming the high-pressure economizer in the sixth heat exchange panel unit N6 are repaired, the state of the heat exchange panel P to be exchanged is shifted to the upper side. Of the heat transfer tubes 3 and the heat transfer tubes 3 in the lower side deviated state, the heat transfer tubes 3 to be replaced at one end (downstream side in the exhaust gas flow direction) in the arrangement direction of the three heat exchange panels P to be replaced. The length of the portion 3W is longer than the length of the replacement portion 3W of the heat transfer tube 3, which is the other end (upstream in the exhaust gas flow direction) of the three heat exchange panels P to be replaced. Therefore, when welding the upper end portion of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ to the lower end portion of the upper side tube portion 3U of the heat transfer tube 3 from which the replacement target portion 3W is cut off, the welding operation is performed. Performance can be improved.

つまり、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３における交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接する際に、伝熱管３における交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部の高さが、管軸心方向において隣り合うもの同士では異なる高さとなるため、管軸心方向において隣り合う伝熱管３の上方側部分の下端部に対して、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚを溶接することを、別の作業者によって同時に行うこと可能になる等、溶接作業の作業性を向上することができる。   In other words, when the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ is welded to the lower end of the upper tube portion 3U of the heat transfer tube 3 from which the replacement target portion 3W is cut off, the replacement of the heat transfer tube 3 is performed. Since the height of the lower end of the upper tube portion 3U from which the portion 3W has been cut is different between adjacent tubes in the tube axis direction, the height of the upper portion of the heat transfer tube 3 adjacent in the tube axis direction is different. The workability of the welding operation can be improved, for example, by welding another heat transfer tube portion 3Z of the replacement panel portion PZ to the lower end portion by another operator.

さらに、本第２実施形態においては、３枚の交換対象の熱交換パネルＰにおける上手側偏位状態の伝熱管３の交換対象部分３Ｗの長さが同じでかつ３枚の交換対象の熱交換パネルＰにおける下手側偏位状態の伝熱管３の交換対象部分３Ｗの長さが同じあるから、３枚の交換対象の熱交換パネルＰの夫々に装着する交換用パネル部分ＰＺを、３枚の交換対象の熱交換パネルＰについて共用できるものとなるため、３枚の交換対象の熱交換パネルＰについて、一つの仕様の交換用パネル部分ＰＺを製作すれば良いため、交換用パネル部分ＰＺの製作が容易になる。   Further, in the second embodiment, the three heat exchange panels P to be exchanged have the same length of the exchange target portions 3W of the heat transfer tubes 3 in the superiorly displaced state and the three heat exchange panels to be exchanged. Since the replacement target portions 3W of the heat transfer tubes 3 in the lower-side deviated state in the panel P have the same length, the replacement panel portions PZ to be mounted on each of the three heat exchange panels P to be replaced are replaced with three replacement panel portions PZ. Since the heat exchange panel P to be exchanged can be shared, the exchange panel part PZ of one specification only needs to be manufactured for the three heat exchange panels P to be exchanged. Becomes easier.

〔第３実施形態〕
次に、第３実施形態を説明するが、この第３実施形態は、排熱回収ボイラの補修方法の別実施形態を示すものであって、排熱回収ボイラの具体構成は第１実施形態と同様であるので、以下、第１実施形態と異なる部分を詳述して、第１実施形態と同じ部分には、同じ符号を付して、詳細な説明を省略する。 [Third embodiment]
Next, a third embodiment will be described. This third embodiment shows another embodiment of a method for repairing an exhaust heat recovery boiler. The specific configuration of the exhaust heat recovery boiler is the same as that of the first embodiment. Therefore, portions different from the first embodiment will be described in detail below, and the same portions as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

第３実施形態の排熱回収ボイラの補修方法を、第１実施形態と同様に、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修する場合について説明する。   The method for repairing the exhaust heat recovery boiler of the third embodiment is described for the case of repairing three heat exchange panels P forming a high-pressure economizer in the sixth heat exchange panel unit N6, as in the first embodiment. I do.

図１４〜図１７に示す如く、第１実施形態と同様に、熱交換パネルＰの下部管寄せ２に対応する交換用下部管寄せ２Ｚと複数の伝熱管３の下方側の交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚとを備える形態に製作した交換用パネル部分ＰＺを予め準備し、この交換用パネル部分ＰＺを、交換対象の熱交換パネルＰに装着する。   As shown in FIGS. 14 to 17, similarly to the first embodiment, the replacement lower header 2 </ b> Z corresponding to the lower header 2 of the heat exchange panel P and the replacement target portion 3 </ b> W on the lower side of the plurality of heat transfer tubes 3. A replacement panel portion PZ manufactured in a form including the corresponding replacement heat transfer tube portion 3Z is prepared in advance, and the replacement panel portion PZ is mounted on the heat exchange panel P to be replaced.

つまり、図１４及び図１５に示すように、熱交換パネルＰの複数の伝熱管３を、交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する。
その後、図１６及び図１７に示すように、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３おける交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。 That is, as shown in FIGS. 14 and 15, the plurality of heat transfer tubes 3 of the heat exchange panel P are cut so as to separate the replacement target portion 3W, and the lower header 2 and the heat transfer tubes 3 of the heat exchange panel P are cut off. The exchange target portion 3W is separated.
Thereafter, as shown in FIGS. 16 and 17, the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ is welded to the lower end of the upper tube portion 3U of the heat transfer tube 3 from which the replacement target portion 3W is cut off. Then, the replacement panel portion PZ is mounted on the heat exchange panel P.

また、第３実施形態においても、排ガス流動方向に沿って密接状態に並設される５枚の熱交換パネルＰのうちの、高圧節炭器を形成する３枚の熱交換パネルＰを補修するものであるから、第６熱交換パネルユニットＮ６の密接状態に並ぶ５枚の熱交換パネルＰのうちで、並び方向の一端側から他端側に向かう３枚の熱交換パネルＰを交換対象の熱交換パネルＰとする。   Also in the third embodiment, of the five heat exchange panels P juxtaposed closely in the exhaust gas flow direction, three heat exchange panels P forming a high-pressure economizer are repaired. Therefore, among the five heat exchange panels P arranged in close contact with each other in the sixth heat exchange panel unit N6, three heat exchange panels P from one end side to the other end side in the arrangement direction are replaced. The heat exchange panel P is used.

そして、図１４及び図１５に示すように、それら交換対象の熱交換パネルＰのうちの一端側の熱交換パネルＰから他端側の熱交換パネルＰに向けて、順次、複数の伝熱管３を、交換対象部分３Ｗを切り離す状態に切断して、熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離する。   Then, as shown in FIGS. 14 and 15, a plurality of heat transfer tubes 3 are sequentially arranged from the heat exchange panel P on one end of the heat exchange panels P to be exchanged to the heat exchange panel P on the other end. Of the heat exchange panel P, and the exchange target portion 3W of the heat transfer tube 3 are separated.

熱交換パネルＰの下部管寄せ２及び伝熱管３の交換対象部分３Ｗを分離した後は、図１６及び図１７に示すように、３枚の交換対象の熱交換パネルＰのうちの他端側の熱交換パネルＰから一端側の熱交換パネルＰに向けて、順次、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を伝熱管３における交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接して、交換用パネル部分ＰＺを熱交換パネルＰに装着することになる。   After separating the lower header 2 of the heat exchange panel P and the portion 3W to be exchanged of the heat transfer tube 3, as shown in FIGS. 16 and 17, the other end of the three heat exchange panels P to be exchanged. From the heat exchange panel P to the heat exchange panel P on one end side, the upper end of the exchange heat transfer tube portion 3Z of the exchange panel portion PZ is sequentially connected to the upper side tube from which the exchange target portion 3W of the heat transfer tube 3 is cut off. The replacement panel portion PZ is attached to the heat exchange panel P by welding to the lower end of the portion 3U.

そして、本第３実施形態においては、交換対象の熱交換パネルＰにおける上手側偏位状態の伝熱管の３の交換対象部分３Ｗの長さと下手側偏位状態の伝熱管３の交換対象部分３Ｗの長さとを同じに設定する。   Then, in the third embodiment, the length of the exchange target portion 3W of the heat transfer tube 3 in the upwardly displaced state and the exchange target portion 3W of the heat transfer tube 3 in the downwardly displaced state in the heat exchange panel P to be exchanged. Set to the same length as

加えて、３枚の交換対象の熱交換パネルＰの並び方向の一端側の熱交換パネルＰから他端側の熱交換パネルＰに向けて、順次、伝熱管３の交換対象部分３Ｗの長さを短くする。   In addition, the length of the exchange target portion 3W of the heat transfer tube 3 sequentially from the heat exchange panel P on one end side to the heat exchange panel P on the other end side in the arrangement direction of the three heat exchange panels P to be exchanged. Shorten.

（第３実施形態のまとめ）
第３実施形態の排熱回収ボイラの補修方法は、第１実施形態の排熱回収ボイラの補修方法と同様に、熱交換パネルＰの下部管寄せ２に対応する交換用下部管寄せ２Ｚと複数の伝熱管３の下方側の交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚとを備える形態に製作した交換用パネル部分ＰＺを準備しておき、この予め準備した交換用パネル部分ＰＺを、交換対象の熱交換パネルＰに装着するものであるから、補修作業の容易化を図ることができる。 (Summary of Third Embodiment)
The repair method of the exhaust heat recovery boiler of the third embodiment includes a plurality of replacement lower headers 2Z corresponding to the lower header 2 of the heat exchange panel P, similarly to the repair method of the exhaust heat recovery boiler of the first embodiment. The replacement panel portion PZ manufactured in a form including a replacement heat transfer tube portion 3Z corresponding to the replacement target portion 3W on the lower side of the heat transfer tube 3 is prepared, and the prepared replacement panel portion PZ is prepared. Since it is mounted on the heat exchange panel P to be replaced, repair work can be facilitated.

そして、本第３実施形態においては、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修するにあたり、交換対象の熱交換パネルＰにおける上手側偏位状態の伝熱管３の交換対象部分３Ｗの長さと下手側偏位状態の伝熱管３の交換対象部分３Ｗの長さとが同じであるから、一つの熱交換パネルＰの複数の伝熱管３を同じ高さで切断すればよいため、交換対象の熱交換パネルＰの伝熱管３を切断する作業が容易となる。   In the third embodiment, when the three heat exchange panels P forming the high-pressure economizer in the sixth heat exchange panel unit N6 are repaired, the state of the heat-exchange panel P to be exchanged is on the upper side. Since the length of the exchange target portion 3W of the heat transfer tube 3 is the same as the length of the exchange target portion 3W of the heat transfer tube 3 in the lower side deviated state, the plurality of heat transfer tubes 3 of one heat exchange panel P are set at the same height. In this case, the work of cutting the heat transfer tubes 3 of the heat exchange panel P to be replaced becomes easy.

しかも、３枚の交換対象の熱交換パネルＰの並び方向の一端側の熱交換パネルＰから他端側の熱交換パネルＰに向けて、順次、伝熱管３の交換対象部分３Ｗの長さを短くするから、一端側の熱交換パネルＰの伝熱管３を切断した後、その熱交換パネルＰの内方側（他端側）に位置する熱交換パネルＰの伝熱管３を切断するときに、その切断位置が一端側の熱交換パネルＰの伝熱管３の切断位置よりも低くなるため、一端側の熱交換パネルＰの内方側（他端側）に位置する熱交換パネルＰの伝熱管３を切断するときに、切断する熱交換パネルＰよりも一端側（作業空間Ｓの存在側）に位置する熱交換パネルＰの伝熱管３が邪魔になることを回避できるものとなり、一端側の熱交換パネルＰよりも内方側（他端側）に位置する熱交換パネルＰの伝熱管３を切断する作業を良好に行える。   Moreover, the length of the exchange target portion 3W of the heat transfer tube 3 is sequentially increased from the heat exchange panel P on one end side in the direction in which the three heat exchange panels P to be exchanged are arranged to the heat exchange panel P on the other end side. Since the length is shortened, after cutting the heat transfer tubes 3 of the heat exchange panel P on one end side, when cutting the heat transfer tubes 3 of the heat exchange panel P located on the inner side (the other end side) of the heat exchange panel P, Since the cutting position is lower than the cutting position of the heat transfer tube 3 of the heat exchange panel P on one end, the transfer of the heat exchange panel P located inside (the other end) of the heat exchange panel P on one end is performed. When cutting the heat pipe 3, the heat transfer pipe 3 of the heat exchange panel P located at one end side (the side where the work space S exists) from the heat exchange panel P to be cut can be prevented from obstructing, and the one end side Of the heat exchange panel P located on the inner side (the other end side) of the heat exchange panel P of FIG. Satisfactorily perform the task of cutting the pipe 3.

〔第４実施形態〕
次に、第４実施形態を説明するが、この第４実施形態は、排熱回収ボイラの補修方法の別実施形態を示すものであって、排熱回収ボイラの具体構成は第１実施形態と同様であるので、以下、第１実施形態と異なる部分を詳述して、第１実施形態と同じ部分には、同じ符号を付して、詳細な説明を省略する。 [Fourth embodiment]
Next, a fourth embodiment will be described. This fourth embodiment shows another embodiment of a method for repairing an exhaust heat recovery boiler. The specific configuration of the exhaust heat recovery boiler is different from that of the first embodiment. Therefore, portions different from the first embodiment will be described in detail below, and the same portions as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

第４実施形態の排熱回収ボイラの補修方法を、第１実施形態と同様に、第６熱交換パネルユニットＮ６における高圧節炭器を形成する３枚の熱交換パネルＰを補修する場合について説明する。   The repair method of the exhaust heat recovery boiler of the fourth embodiment will be described for the case of repairing three heat exchange panels P forming a high pressure economizer in the sixth heat exchange panel unit N6, as in the first embodiment. I do.

この第４実施形態においては、図１８及び図１９に示すように、管軸心方向に並ぶ複数の伝熱管３のうちの、管軸心方向において下部管寄せ２に接続される連絡管５の接続箇所を含む一部の範囲Ｑの複数の伝熱管３を交換対象伝熱管３Ｋとする。
つまり、第１実施形態においては、管軸心方向に並ぶ複数の伝熱管３の全てを一挙に交換するものであるが、この第４実施形態においては、上述の一部の範囲Ｑの複数の伝熱管３を交換対象伝熱管３Ｋとするように構成されている。 In the fourth embodiment, as shown in FIG. 18 and FIG. 19, among the plurality of heat transfer tubes 3 arranged in the tube axis direction, the connecting tube 5 connected to the lower header 2 in the tube axis direction is used. The plurality of heat transfer tubes 3 in a part of the range Q including the connection point are set as the heat transfer tubes 3K to be replaced.
That is, in the first embodiment, all of the plurality of heat transfer tubes 3 arranged in the tube axis direction are exchanged at once, but in the fourth embodiment, the plurality of heat transfer tubes 3 in the partial range Q described above are replaced. The heat transfer tube 3 is configured to be the heat transfer tube 3K to be replaced.

下部管寄せ２には、管軸心方向の中央部に仕切部６が設けられて、一端側部分２Ｒと他端側部分２Ｌとの夫々に、連絡管５が接続されることになるため、上述の一部の範囲Ｑが、一対存在することになる。   The lower header 2 is provided with a partition 6 at the center in the pipe axis direction, and the connecting pipe 5 is connected to each of the one end 2R and the other end 2L. The above-mentioned partial range Q exists as a pair.

すなわち、図１９は、高圧節炭器を形成する３枚の熱交換パネルＰの下部管寄せ２の下部に連絡管５が接続される状態を示しながら、流体の流動形態を概略的に示しており、作業空間Ｓに隣接する下部管寄せ２に接続した一対の連絡管５の一方には、他の高圧節炭器からの流体が供給されることになる。
一対の連絡管５のうちの一方に供給された流体は、下部管寄せ２の一端側部分２Ｒ及び伝熱管３を通して上部管寄せ１に流動し、その後、伝熱管３及び下部管寄せ２の他端側部分２Ｌを通して、一対の連絡管５のうちの他方に流動することになる。 That is, FIG. 19 schematically shows the flow form of the fluid while showing a state in which the connecting pipe 5 is connected to the lower part of the lower header 2 of the three heat exchange panels P forming the high-pressure economizer. In addition, one of the pair of connecting pipes 5 connected to the lower header 2 adjacent to the work space S is supplied with fluid from another high pressure economizer.
The fluid supplied to one of the pair of connecting pipes 5 flows to the upper header 1 through the one end portion 2R of the lower header 2 and the heat transfer pipe 3, and then flows to the other of the heat transfer pipe 3 and the lower header 2. It flows to the other of the pair of connecting pipes 5 through the end portion 2L.

一対の連絡管５のうちの他方に流動した流体は、連絡管５を通して、作業空間Ｓから離れる側に位置する次の熱交換パネルＰの下部管寄せ２に流動することになる。具体的には、下部管寄せ２の他端側部分２Ｌに流動する。
下部管寄せ２の他端側部分２Ｌに流動した流体は、伝熱管３を通して上部管寄せ１に流動し、その後、伝熱管３を通して、下部管寄せ２の一端側部分２Ｒに流動する。 The fluid flowing to the other of the pair of communication tubes 5 flows through the communication tube 5 to the lower header 2 of the next heat exchange panel P located on the side away from the work space S. Specifically, it flows to the other end 2 L of the lower header 2.
The fluid that has flowed to the other end portion 2L of the lower header 2 flows to the upper header 1 through the heat transfer tube 3, and then flows to the one end portion 2R of the lower header 2 through the heat transfer tube 3.

下部管寄せ２の一端側部分２Ｒに流動した流体は、その一端側部分２Ｒに接続した連絡管５を通して、作業空間Ｓから最も離れる側に位置する熱交換パネルＰの下部管寄せ２に流動することになる。具体的には、下部管寄せ２の一端側部分２Ｒに流動する。
下部管寄せ２の一端側部分２Ｒに流動した流体は、伝熱管３を通して上部管寄せ１に流動し、その後、伝熱管３を通して、下部管寄せ２の他端側部分２Ｌに流動する。 The fluid that has flowed to the one end portion 2R of the lower header 2 flows through the connecting pipe 5 connected to the one end portion 2R to the lower header 2 of the heat exchange panel P located farthest from the work space S. Will be. Specifically, it flows to the one end side portion 2R of the lower header 2.
The fluid flowing to the one end portion 2R of the lower header 2 flows to the upper header 1 through the heat transfer tube 3, and then flows to the other end portion 2L of the lower header 2 through the heat transfer tube 3.

下部管寄せ２の他端側部分２Ｌに流動した流体は、図示は省略するが、その他端側部分２Ｌに接続した連絡管５を通して、他の高圧節炭器を形成する熱交換パネルＰに流動することになる。
以上の通り、下部管寄せ２には、一端側部分２Ｒと他端側部分２Ｌとの夫々に、連絡管５が接続されることになるため、上述の一部の範囲Ｑが、一対存在することになる。 Although not shown, the fluid flowing to the other end portion 2L of the lower header 2 flows to the heat exchange panel P forming another high-pressure economizer through the connecting pipe 5 connected to the other end portion 2L. Will do.
As described above, in the lower header 2, since the connecting pipe 5 is connected to each of the one end portion 2 </ b> R and the other end portion 2 </ b> L, the above-described partial range Q exists in a pair. Will be.

ちなみに、本実施形態においては、３枚の熱交換パネルＰの下部管寄せ２の一端側部分２Ｒに接続される連絡管５の接続位置は、作業空間Ｓから離れる側に向かって、例えば、２本の伝熱管３の設置距離に相当する間隔にて、下部管寄せ２の中央側（図１９においては左側）に偏位することになる。
同様に、３枚の熱交換パネルＰの下部管寄せ２の他端側部分２Ｌに接続される連絡管５の接続位置は、作業空間Ｓから離れる側に向かって、例えば、２本の伝熱管３の設置距離に相当する間隔にて、下部管寄せ２の中央側（図１９においては右側）に偏位することになる。 Incidentally, in this embodiment, the connection position of the connecting pipe 5 connected to the one end portion 2R of the lower header 2 of the three heat exchange panels P is, for example, 2 to the side away from the work space S. At an interval corresponding to the installation distance of the heat transfer tubes 3, the heat transfer tubes 3 are deviated toward the center (the left side in FIG. 19) of the lower header 2.
Similarly, the connection position of the connecting tube 5 connected to the other end portion 2L of the lower header 2 of the three heat exchange panels P is, for example, two heat transfer tubes toward the side away from the work space S. At a distance corresponding to the installation distance of 3, the center of the lower header 2 is shifted toward the center (the right side in FIG. 19).

上述の一部の範囲Ｑは、連絡管５の接続箇所から左右両側の夫々において流れ加速腐食が生じる傾向にある伝熱管３の存在範囲に対応して定めることになり、例えば、連絡管５の接続箇所から左右両側の夫々において、例えば１０本程度の伝熱管３に存在範囲に対応して定めることになる。尚、図１８及び図２０においては、黒塗りつぶしている。同様に、図１９においては、流れ加速腐食が生じる傾向にある伝熱管３を、他の伝熱管３と区別するために、流れ加速腐食が生じる傾向にある伝熱管３を、他の伝熱管３と区別するために、太線にて記載する。   The above-mentioned partial range Q is determined corresponding to the existence range of the heat transfer tube 3 in which flow accelerated corrosion tends to occur at each of the left and right sides from the connection point of the communication tube 5. In each of the right and left sides from the connection point, for example, about 10 heat transfer tubes 3 are determined corresponding to the existing range. 18 and 20 are blacked out. Similarly, in FIG. 19, in order to distinguish the heat transfer tube 3 in which flow accelerated corrosion tends to occur from the other heat transfer tube 3, the heat transfer tube 3 in which flow accelerated corrosion tends to occur is replaced by another heat transfer tube 3. In order to distinguish from, it is described by a thick line.

但し、本実施形態においては、高圧節炭器を形成する３枚の熱交換パネルＰを一挙に補修するものであるから、交換対象範囲としての一部の範囲Ｑは、上述した３枚の熱交換パネルＰにおける連絡管５の接続位置に鑑みて、定めることになる。   However, in the present embodiment, since the three heat exchange panels P forming the high-pressure economizer are repaired at one time, a partial range Q as a replacement target range is the three heat exchange panels described above. It is determined in consideration of the connection position of the communication pipe 5 on the replacement panel P.

すなわち、下部管寄せ２の一端側部分２Ｒについては、作業空間Ｓに隣接する下部管寄せ２に接続される連絡管５の右側の範囲を、例えば１０程度の伝熱管３が存在する範囲とし、作業空間Ｓに隣接する下部管寄せ２に接続される連絡管５の左側の範囲を、例えば１４程度の伝熱管３が存在する範囲とする形態で、上述の一部の範囲Ｑを定める。   That is, for the one end side portion 2R of the lower header 2, a range on the right side of the connecting pipe 5 connected to the lower header 2 adjacent to the work space S is a range in which, for example, about 10 heat transfer tubes 3 exist. The above-mentioned partial range Q is determined in such a manner that the range on the left side of the connecting pipe 5 connected to the lower header 2 adjacent to the work space S is a range in which, for example, about 14 heat transfer tubes 3 are present.

また、下部管寄せ２の他端側部分２Ｌについては、作業空間Ｓに隣接する下部管寄せ２に接続される連絡管５の左側の範囲を、例えば１０程度の伝熱管３が存在する範囲とし、作業空間Ｓに隣接する下部管寄せ２に接続される連絡管５の右側の範囲を、例えば１４程度の伝熱管３が存在する範囲とする形態で、上述の一部の範囲Ｑを定める。   As for the other end portion 2L of the lower header 2, a range on the left side of the connecting pipe 5 connected to the lower header 2 adjacent to the work space S is a range in which, for example, about 10 heat transfer tubes 3 exist. The above-mentioned partial range Q is determined in such a manner that the range on the right side of the connecting pipe 5 connected to the lower header 2 adjacent to the work space S is a range in which, for example, about 14 heat transfer tubes 3 are present.

本実施形態の補修方法においては、図２０〜図２３に示すように、交換用パネル部分ＰＺが、交換対象伝熱管３Ｋにおける交換対象部分３Ｗに対応する交換用伝熱管部分３Ｚ、及び、下部管寄せ２のうちの、交換対象伝熱管３Ｋが接続される交換対象下部管寄せ部分２Ｋに対応する交換用下部管寄せ部分２ｚを備える形態で作成されている。
つまり、複数の交換用伝熱管部分３Ｚ及び交換用下部管寄せ部分２ｚを備える形態に製作した交換用パネル部分ＰＺを予め準備しておく。 In the repair method of the present embodiment, as shown in FIGS. 20 to 23, the replacement panel portion PZ includes the replacement heat transfer tube portion 3Z corresponding to the replacement target portion 3W of the replacement heat transfer tube 3K, and the lower tube. It is created in the form of including the replacement lower header portion 2z corresponding to the replacement lower header portion 2K to which the replacement heat transfer tube 3K is connected.
That is, a replacement panel portion PZ prepared in a form including a plurality of replacement heat transfer tube portions 3Z and a replacement lower header portion 2z is prepared in advance.

そして、図２０及び図２２に示すように、熱交換パネルＰの複数の伝熱管３うちの交換対象伝熱管３Ｋを、交換対象部分３Ｗを切り離す状態に切断して、交換対象部分３Ｗを分離し、そのきに、下部管寄せ２から交換対象下部管寄せ部分２Ｋを切断して分離する。   Then, as shown in FIGS. 20 and 22, the heat exchange tubes 3K to be exchanged among the plurality of heat exchange tubes 3 of the heat exchange panel P are cut so as to separate the exchange target portions 3W, thereby separating the exchange object portions 3W. At that time, the lower header 2K to be replaced is cut from the lower header 2 and separated.

その後、図２１及び図２３に示すように、交換用パネル部分ＰＺの交換用伝熱管部分３Ｚの上端部を、交換対象伝熱管３Ｋおける交換対象部分３Ｗが切り離された上方側管部分３Ｕの下端部に溶接し、加えて、交換用下部管寄せ部分２ｚの端部を、下部管寄せ２における交換対象下部管寄せ部分２Ｋが切り離されて残存する残存下部管寄せ部分２Ｎの端部に溶接することにより、交換用パネル部分ＰＺを熱交換パネルＰに装着する。   Thereafter, as shown in FIGS. 21 and 23, the upper end of the replacement heat transfer tube portion 3Z of the replacement panel portion PZ is connected to the lower end of the upper tube portion 3U of the replacement heat transfer tube 3K from which the replacement target portion 3W is cut off. In addition, the end of the replacement lower header portion 2z is welded to the end of the remaining lower header portion 2N in the lower header 2 where the replacement target lower header portion 2K is cut off. Thereby, the replacement panel portion PZ is mounted on the heat exchange panel P.

ちなみに、本実施形態においては、排ガス流動方向に沿って密接状態に並設される５枚の熱交換パネルＰのうちの、高圧節炭器を形成する３枚の熱交換パネルＰを補修するものであるから、上述した第１実施形態と同様に、３枚の熱交換パネルＰの夫々について、交換用パネル部分ＰＺを熱交換パネルＰに装着する作業を行うことになる。   Incidentally, in the present embodiment, of the five heat exchange panels P arranged side by side closely in the exhaust gas flow direction, three heat exchange panels P forming a high-pressure economizer are repaired. Therefore, as in the first embodiment described above, for each of the three heat exchange panels P, the work of attaching the replacement panel portion PZ to the heat exchange panel P is performed.

尚、本実施形態においては、第１実施形態と同様に、３枚の交換対象の熱交換パネルＰにおける伝熱管３の交換対象部分３Ｗの長さが同じ長さに設定されているが、これに代えて、第２実施形態や第３実施形態の構成を採用するようにしてもよい。   Note that, in the present embodiment, as in the first embodiment, the length of the exchange target portion 3W of the heat transfer tube 3 in the three exchange target heat exchange panels P is set to the same length. Instead, the configuration of the second embodiment or the third embodiment may be adopted.

（第４実施形態のまとめ）
第４実施形態の排熱回収ボイラの補修方法は、第１実施形態の排熱回収ボイラの補修方法と同様に、補修作業の容易化を図ることができるものである。 (Summary of Fourth Embodiment)
The repair method of the heat recovery steam generator of the fourth embodiment can facilitate the repair work similarly to the repair method of the heat recovery steam generator of the first embodiment.

加えて、第４実施形態の排熱回収ボイラの補修方法は、管軸心方向に並ぶ複数の伝熱管３のうちの、管軸心方向において下部管寄せ２に接続される連絡管５の接続箇所を含む一部の範囲Ｑの複数の伝熱管３を交換対象伝熱管３Ｋとするものであるから、補修作業の簡略化を図ることができ、また、交換用パネル部分ＰＺの低廉化により、補修に要するコストの低下を図ることができる。   In addition, the repair method of the exhaust heat recovery boiler according to the fourth embodiment includes connecting the connecting pipe 5 connected to the lower header 2 in the pipe axis direction among the plurality of heat transfer pipes 3 arranged in the pipe axis direction. Since the plurality of heat transfer tubes 3 in a part of the range Q including the portion are used as the heat transfer tubes 3K to be replaced, the repair work can be simplified, and the cost of the replacement panel portion PZ can be reduced. The cost required for repair can be reduced.

〔別実施形態〕
次に別実施形態を説明する。
（１）上記の第１〜第３実施形態では、排ガス流動方向に沿って密接状態で並ぶ５枚の熱交換パネルＰのうちの、３枚の熱交換パネルＰを交換対象の熱交換パネルＰとする場合を例示したが、排ガス流動方向に沿って密接状態で並ぶ複数枚の熱交換パネルＰのうちの、交換対象とする熱交換パネルＰとする枚数は、種々変更できるものである。 [Another embodiment]
Next, another embodiment will be described.
(1) In the above-described first to third embodiments, three of the five heat exchange panels P arranged in close proximity along the flow direction of the exhaust gas are replaced with three heat exchange panels P to be replaced. However, the number of heat exchange panels P to be exchanged among the plurality of heat exchange panels P arranged in a close state along the exhaust gas flow direction can be variously changed.

例えば、排ガス流動方向に沿って密接状態で並ぶ複数枚の熱交換パネルＰのうちの、一端側の一枚の熱交換パネルＰを交換対象の熱交換パネルＰとしてもよく、また、排ガス流動方向に沿って密接状態で並ぶ複数枚の熱交換パネルＰの全てを交換対象の熱交換対象の熱交換パネルＰとしてもよい。   For example, one of the plurality of heat exchange panels P arranged closely in the exhaust gas flow direction may be one heat exchange panel P on one end side as a heat exchange panel P to be exchanged. All of the plurality of heat exchange panels P arranged in a close line along may be used as heat exchange panels P to be exchanged.

（２）上記の第１〜第３実施形態では、９個の熱交換パネルユニットＮを備える排熱回収ボイラを例示したが、本発明の補修方法を適用する排熱回収ボイラの具体構成は、各種変更できるものである。 (2) In the above-described first to third embodiments, the exhaust heat recovery boiler including the nine heat exchange panel units N is illustrated. However, the specific configuration of the exhaust heat recovery boiler to which the repair method of the present invention is applied is as follows. Various changes can be made.

（３）上記第１〜第３実施形態では、複数の熱交換パネルＰの全てが、排ガス流動方向に密接状態に並べられて交換パネルユニットＮを形成する場合を例示したが、複数の熱交換パネルＰのうちの一部の熱交換パネルＰが、他の熱交換パネルＰと離れる単一の熱交換パネルＰとして配置する形態で設けられる場合においても、本発明の補修方法は適用できるものである。 (3) In the first to third embodiments, the case where all of the plurality of heat exchange panels P are arranged closely in the exhaust gas flow direction to form the exchange panel unit N has been described. The repair method of the present invention can be applied to the case where some of the heat exchange panels P of the panels P are provided in the form of being arranged as a single heat exchange panel P separated from other heat exchange panels P. is there.

（４）上記の第１〜第３実施形態では、熱交換パネルＰの管軸心方向に並ぶ複数の伝熱管３が、排ガス流動方向の上手側に偏位する上手側偏位状態と排ガス流動方向の下手側に偏位する下手側偏位状態とに、管軸心方向に沿って交互に設置される形態で設けられる熱交換パネルＰについて、補修する場合を例示したが、熱交換パネルＰの管軸心方向に並ぶ複数の伝熱管３が、排ガス流動方向において同じ位置に位置する状態で設置される形態で設けられる熱交換パネルＰについても、同様に補修することができるものである。 (4) In the above-described first to third embodiments, the plurality of heat transfer tubes 3 arranged in the pipe axis direction of the heat exchange panel P are deflected to the upstream side in the exhaust gas flow direction and the exhaust gas flow. The case where the heat exchange panels P provided in such a manner that the heat exchange panels P are provided alternately along the pipe axial direction to the lower side deflected state deviating to the lower side in the direction is illustrated. The heat exchange panel P provided in such a manner that the plurality of heat transfer tubes 3 arranged in the pipe axial direction are located at the same position in the exhaust gas flow direction can be similarly repaired.

（５）排ガス流動方向に密接状態に並べる複数の熱交換パネルＰを補修するにあたり、各熱交換パネルＰの伝熱管３の交換対象部分３Ｗの長さは、上記の第１〜第３実施形態で記載の長さに限定されるものではなく、作業状況等を考慮して、種々変更できる。 (5) In repairing a plurality of heat exchange panels P arranged closely in the flow direction of the exhaust gas, the length of the exchange target portion 3W of the heat transfer tube 3 of each heat exchange panel P is determined by the first to third embodiments described above. The length is not limited to the length described in the above, but can be variously changed in consideration of the work situation and the like.

尚、上記実施形態（別実施形態を含む、以下同じ）で開示される構成は、矛盾が生じない限り、他の実施形態で開示される構成と組み合わせて適用することが可能であり、また、本明細書において開示された実施形態は例示であって、本発明の実施形態はこれに限定されず、本発明の目的を逸脱しない範囲内で適宜改変することが可能である。   Note that the configuration disclosed in the above-described embodiment (including another embodiment, the same applies hereinafter) can be applied in combination with the configuration disclosed in other embodiments, as long as no contradiction occurs. The embodiment disclosed in the present specification is an exemplification, and the embodiment of the present invention is not limited thereto, and can be appropriately modified without departing from the object of the present invention.

１ 上部管寄せ
２ 下部管寄せ
２Ｋ 交換対象下部寄せ部分
２Ｎ 残存下部管寄せ部分
２Ｚ 交換用下部管寄せ
２ｚ 交換用下部管寄せ部分
３ 伝熱管
３Ｋ 交換対象伝熱管
３Ｕ 上方側管部分
３Ｗ 交換対象部分
３Ｚ 交換用伝熱管部分
ＧＴ ガスタービン
Ｐ 熱交換パネル
ＰＺ 交換用パネル部分 REFERENCE SIGNS LIST 1 Upper header 2 Lower header 2K Replacement lower header 2N Remaining lower header 2Z Replacement lower header 2z Replacement lower header 3K Heat transfer tube 3K Replacement heat transfer tube 3U Upper side tube 3W Replacement portion 3Z Replacement heat transfer tube part GT Gas turbine P Heat exchange panel PZ Replacement panel part

Claims (6)

平行状に位置する上部管寄せと下部管寄せとの管軸心方向に沿って並ぶ複数の伝熱管を前記上部管寄せと前記下部寄せとの間に接続した熱交換パネルが、ガスタービンの排ガス流動方向に並設された排熱回収ボイラの補修方法であって、
前記熱交換パネルの前記下部管寄せに対応する交換用下部寄せと複数の前記伝熱管の下方側の交換対象部分に対応する交換用伝熱管部分とを備える形態に製作した交換用パネル部分を予め準備し、
前記熱交換パネルの複数の前記伝熱管を、前記交換対象部分を切り離す状態に切断して、前記熱交換パネルの前記下部管寄せ及び前記伝熱管の前記交換対象部分を分離し、
その後、前記交換用パネル部分の交換用伝熱管部分の上端部を前記伝熱管おける前記交換対象部分が切り離された上方側管部分の下端部に溶接して、前記交換用パネル部分を前記熱交換パネルに装着することを特徴とする排熱回収ボイラの補修方法。 A heat exchange panel in which a plurality of heat transfer tubes arranged in parallel along the axial direction of the upper header and the lower header positioned in parallel are connected between the upper header and the lower header. A method for repairing an exhaust heat recovery boiler arranged in the flow direction,
A replacement panel portion manufactured in a form including a lower replacement portion corresponding to the lower header portion of the heat exchange panel and a replacement heat transfer tube portion corresponding to a replacement target portion below the plurality of heat transfer tubes is prepared in advance. Prepare,
A plurality of the heat transfer tubes of the heat exchange panel, cut to cut off the portion to be replaced, to separate the lower header of the heat exchange panel and the portion to be replaced of the heat transfer tube,
Thereafter, an upper end portion of the replacement heat transfer tube portion of the replacement panel portion is welded to a lower end portion of the upper side tube portion of the heat transfer tube from which the replacement target portion is cut off, and the replacement panel portion is subjected to the heat exchange. A method for repairing an exhaust heat recovery boiler, which is mounted on a panel. 複数の前記熱交換パネルが、前記排ガス流動方向に沿って密接状態に並設され、
密接状態に並ぶ複数の前記熱交換パネルのうちで、並び方向の一端側から他端側に向かう複数の熱交換パネルを交換対象の熱交換パネルとして、それら交換対象の熱交換パネルのうちの一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、複数の前記伝熱管を、前記交換対象部分を切り離す状態に切断して、前記熱交換パネルの前記下部管寄せ及び前記伝熱管の前記交換対象部分を分離し、
その後、複数の前記交換対象の熱交換パネルのうちの他端側の熱交換パネルから一端側の熱交換パネルに向けて、順次、前記交換用パネル部分の交換用伝熱管部分の上端部を前記伝熱管における前記交換対象部分が切り離された上方側管部分の下端部に溶接して、前記交換用パネル部分を前記熱交換パネルに装着することを特徴とする請求項１記載の排熱回収ボイラの補修方法。 A plurality of the heat exchange panels are juxtaposed in a close state along the exhaust gas flow direction,
Among the plurality of heat exchange panels arranged in a close state, a plurality of heat exchange panels directed from one end side to the other end side in the arrangement direction are set as heat exchange panels to be exchanged, and one end of the heat exchange panels to be exchanged. A plurality of the heat transfer tubes are sequentially cut from the heat exchange panel on the side to the heat exchange panel on the other end so as to cut off the portion to be replaced, and the lower header and the transfer of the heat exchange panel are cut off. Separating the replacement part of the heat tube,
Thereafter, from the heat exchange panel on the other end side of the plurality of heat exchange panels to be exchanged toward the heat exchange panel on one end side, the upper end portion of the exchange heat transfer tube portion of the exchange panel portion is successively arranged. The exhaust heat recovery boiler according to claim 1, wherein the replacement panel portion is attached to the heat exchange panel by welding to a lower end portion of the upper tube portion from which the replacement target portion of the heat transfer tube is cut off. Repair method. 複数の前記交換対象の熱交換パネルにおける前記伝熱管の前記交換対象部分の長さが同じであることを特徴とする請求項２記載の排熱回収ボイラの補修方法。   The method for repairing an exhaust heat recovery boiler according to claim 2, wherein the length of the portion to be replaced of the heat transfer tube in the plurality of heat exchange panels to be replaced is the same. 前記管軸心方向に沿って並ぶ複数の前記伝熱管が、前記排ガス流動方向の上手側に偏位する上手側偏位状態と前記排ガス流動方向の下手側に偏位する下手側偏位状態とに、前記管軸心方向に沿って交互に設置される形態で設けられ、
前記交換対象の熱交換パネルにおける前記上手側偏位状態の前記伝熱管と前記下手側偏位状態の前記伝熱管のうちの、複数の前記交換対象の熱交換パネルの並び方向の一端側となる伝熱管の前記交換対象部分の長さを、複数の前記交換対象の熱交換パネルの並び方向の他端側となる伝熱管の前記交換対象部分の長さよりも長くし、且つ、複数の前記交換対象の熱交換パネルにおける前記上手側偏位状態の伝熱管の前記交換対象部分の長さが同じでかつ複数の前記交換対象の熱交換パネルにおける前記下手側偏位状態の伝熱管の前記交換対象部分の長さが同じあることを特徴とする請求項２記載の排熱回収ボイラの補修方法。 A plurality of the heat transfer tubes arranged along the pipe axis direction, an upper-side offset state in which the upper-side offset state is shifted toward the upper side in the exhaust gas flow direction, and a lower-side offset state in which the lower side offset state is shifted toward the lower side in the exhaust gas flow direction. In, is provided in a form that is alternately installed along the pipe axis direction,
Of the heat transfer tubes in the upper side deviated state and the heat transfer tubes in the lower side deviated state in the heat exchange panel to be exchanged, the heat exchange tubes are located at one end side in the direction in which the plurality of heat exchange panels to be exchanged are arranged. The length of the exchange target portion of the heat transfer tube is longer than the length of the exchange target portion of the heat transfer tube on the other end side in the direction in which the plurality of heat exchange panels to be exchanged are arranged. The replacement target portions of the heat transfer tubes in the lower-side deviation state in the heat exchange panels to be replaced have the same length of the replacement target portions of the heat transfer tubes in the upper-side deviation state and the plurality of heat exchange panels to be replaced. The method for repairing an exhaust heat recovery boiler according to claim 2, wherein the lengths of the portions are the same. 前記管軸心方向に沿って並ぶ複数の前記伝熱管が、前記排ガス流動方向の上手側に偏位する上手側偏位状態と前記排ガス流動方向の下手側に偏位する下手側偏位状態とに、前記管軸心方向に沿って交互に設置される形態で設けられ、
前記交換対象の熱交換パネルにおける前記上手側偏位状態の前記伝熱管の前記交換対象部分の長さと前記下手側偏位状態の前記伝熱管の前記交換対象部分の長さとが同じで、かつ、複数の前記交換対象の熱交換パネルの並び方向の一端側の熱交換パネルから他端側の熱交換パネルに向けて、順次、前記伝熱管の前記交換対象部分の長さを短くすることを特徴とする請求項２記載の排熱回収ボイラの補修方法。 A plurality of the heat transfer tubes arranged along the pipe axis direction, an upper-side offset state in which the upper-side offset state is shifted toward the upper side in the exhaust gas flow direction, and a lower-side offset state in which the lower side offset state is shifted toward the lower side in the exhaust gas flow direction. In, is provided in a form that is alternately installed along the pipe axis direction,
In the heat exchange panel to be exchanged, the length of the exchange target portion of the heat transfer tube in the upwardly displaced state is the same as the length of the exchange target portion of the heat transfer tube in the downwardly displaced state, and It is characterized in that, from the heat exchange panel on one end side in the direction in which the plurality of heat exchange panels to be exchanged are arranged to the heat exchange panel on the other end side, the length of the exchange target portion of the heat transfer tube is sequentially reduced. The method for repairing an exhaust heat recovery boiler according to claim 2. 前記管軸心方向に並ぶ複数の前記伝熱管のうちの、前記管軸心方向において連絡管の接続箇所を含む一部の範囲の複数の伝熱管を交換対象伝熱管として、前記交換用パネル部分が、前記交換対象伝熱管における前記交換対象部分に対応する前記交換用伝熱管部分、及び、前記下部管寄せのうちの、前記交換対象伝熱管が接続される交換対象下部管寄せ部分に対応する交換用下部管寄せ部分を備える形態で作成され、
前記伝熱管のうちの前記交換対象伝熱管における前記交換対象部分を分離するときに、前記下部管寄せから前記交換対象下部管寄せ部分を切断して分離し、
前記交換用パネル部分を前記熱交換パネルに装着するときに、前記交換用伝熱管部分の上端部を前記交換対象伝熱管おける前記交換対象部分が切り離された上方側管部分の下端部に溶接することに加えて、前記交換用下部管寄せ部分の端部を、前記下部管寄せにおける前記交換対象下部管寄せ部分が切り離されて残存する残存下部管寄せ部分の端部に溶接することを特徴とする請求項１〜５のいずれか１項に記載の排熱回収ボイラの補修方法。 Of the plurality of heat transfer tubes arranged in the tube axis direction, a plurality of heat transfer tubes in a partial range including a connection point of a communication tube in the tube axis direction are used as the heat transfer tubes to be replaced, and the replacement panel portion is used. Corresponds to the replacement heat transfer tube portion corresponding to the replacement target portion in the replacement heat transfer tube, and corresponds to the replacement target lower header portion to which the replacement heat transfer tube is connected, of the lower header. Created in a form with a lower header for replacement,
When separating the exchange target portion in the exchange heat transfer tube of the heat transfer tube, cut and separate the exchange target lower header portion from the lower header,
When attaching the replacement panel portion to the heat exchange panel, the upper end of the replacement heat transfer tube portion is welded to the lower end portion of the upper side tube portion of the heat transfer tube to be replaced, from which the replacement target portion is cut off. In addition, an end portion of the replacement lower header portion is welded to an end of a remaining lower header portion where the replacement target lower header portion in the lower header portion is cut off and remains. The method for repairing an exhaust heat recovery boiler according to any one of claims 1 to 5.
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