JP2011002114A - Method of repairing pipe of heat exchanger - Google Patents
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- JP2011002114A JP2011002114A JP2009143183A JP2009143183A JP2011002114A JP 2011002114 A JP2011002114 A JP 2011002114A JP 2009143183 A JP2009143183 A JP 2009143183A JP 2009143183 A JP2009143183 A JP 2009143183A JP 2011002114 A JP2011002114 A JP 2011002114A
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Description
本発明は、排熱回収ボイラの節炭器などの複数の配管からなる熱交換器の配管の補修方法に関する。 The present invention relates to a method for repairing a pipe of a heat exchanger composed of a plurality of pipes such as a economizer of an exhaust heat recovery boiler.
ガスタービンの排ガスから熱交換によって蒸気を発生させる装置として排熱回収ボイラが設置されている。排熱回収ボイラは、内部を冷媒が流れる複数の配管が上下方向に延びるように接続された複数のパネルからなる節炭器を備え、節炭器の配管の間に排ガスを通過させることで、排ガスと冷媒との間で熱交換を行って蒸気を発生させ、この蒸気により発電を行う（例えば、特許文献１参照）。 An exhaust heat recovery boiler is installed as a device for generating steam from the exhaust gas of a gas turbine by heat exchange. The exhaust heat recovery boiler is provided with a economizer composed of a plurality of panels connected so that a plurality of pipes through which the refrigerant flows in the vertical direction extends the exhaust gas between the pipes of the economizer, Heat exchange is performed between the exhaust gas and the refrigerant to generate steam, and electric power is generated using this steam (see, for example, Patent Document 1).
ここで、節炭器の配管には内部を通過する水により流れ加速腐食が生じることがあり、点検作業や補修作業が必要となる。従来より、節炭器の配管の補修作業は、腐食箇所の上下を切断し、新たな配管を接続することにより行っている。特に、節炭器の配管は密集して設けられているため、奥部の配管に腐食が生じた場合には、作業スペースを確保するために手前側の配管も切断していた。 Here, the piping of the economizer may cause accelerated corrosion due to water passing through the inside, and inspection work and repair work are required. Conventionally, repair work of pipes for economizers has been performed by cutting the top and bottom of the corroded area and connecting new pipes. In particular, since the pipes of the economizer are densely provided, the pipes on the front side are also cut in order to secure a work space when corrosion occurs in the pipes in the back.
上記のような奥部の配管の補修作業を行う際に、補修の対象となる配管の切断した部分や、手前側の配管の作業スペースを確保するために切断した部分には、健全な配管を接続する。このような健全な配管として、作業スペースを確保するために切断した手前側の配管を再利用する。しかしながら、これら配管は適宜な長さで切断していたため、切断後の配管の長さがまばらになってしまい、再利用可能な配管数が少なくなっていた。 When repairing the pipes in the back as described above, sound pipes should be used on the cut parts of the pipes to be repaired and on the parts cut to secure the work space of the near side pipes. Connecting. As such a sound pipe, the pipe on the near side that has been cut in order to secure a work space is reused. However, since these pipes were cut at appropriate lengths, the lengths of the pipes after cutting were sparse, and the number of reusable pipes was reduced.
本発明は、上記の問題に鑑みなされたものであり、節炭器の補修作業を行う際に、再利用可能な配管を多数確保することができる方法を提供することである。 This invention is made | formed in view of said problem, and when providing repair work of a economizer, it is providing the method which can ensure many reusable piping.
本発明の熱交換器の補修方法は、複数の熱交換用の配管が手前側から奥側へ並ぶように配置された熱交換器において、腐食が生じた前記配管を補修する方法であって、前記複数の配管のうち、前記腐食が生じた配管及び当該配管よりも手前の配管を切断する切断ステップと、前記配管の切断した部分に健全な配管を接続する接続ステップと、を備え、 前記切断ステップでは、前記腐食が生じた配管よりも手前の配管を、奥側から手前側に向かって切断する部分の長さが長くなるように切断し、前記接続ステップでは、前記切断ステップにおいて切断した配管のうち前記腐食が生じた配管を除く配管に仕上げを施し、前記切断ステップにおいて切断した位置よりも奥側の配管の切断された部分に接続することを特徴とする。 The heat exchanger repair method of the present invention is a method of repairing the pipe in which corrosion has occurred in a heat exchanger arranged such that a plurality of heat exchange pipes are arranged from the front side to the back side, Of the plurality of pipes, the pipe having corrosion and a cutting step for cutting a pipe before the pipe, and a connecting step for connecting a healthy pipe to a cut portion of the pipe, the cutting In the step, the pipe in front of the pipe in which the corrosion has occurred is cut so that the length of the portion to be cut from the back side toward the front side becomes longer. In the connection step, the pipe cut in the cutting step Of these, the pipes except for the pipes where the corrosion has occurred are finished and connected to the cut portions of the pipes behind the positions cut in the cutting step.
上記の熱交換器の配管の補修方法において、前記切断ステップでは、前記腐食が生じた配管よりも手前の配管を、下方の切断位置が略等しい高さに、上方の切断位置が手前側に向かって高くなるように切断してもよい。 In the above heat exchanger pipe repairing method, in the cutting step, the pipe in front of the pipe in which the corrosion has occurred is placed so that the lower cutting position is substantially equal and the upper cutting position faces the front side. It may be cut so that it becomes higher.
本発明によれば、切断の対象となる配管を奥から手前に向かって切断する部分の長さが長くなるように切断することで、健全な配管を切断した部分に接続する際に、健全な配管として一列手前側の配管を用いることができるため、再利用可能な配管を多数確保できる。 According to the present invention, when a pipe to be cut is cut so that the length of the part that cuts from the back toward the front becomes longer, when connecting a healthy pipe to the cut part, Since the pipe on the front side in a row can be used as the pipe, a large number of reusable pipes can be secured.
以下、本発明の熱交換器の配管の補修方法の一実施形態について、節炭器を補修する場合を例として図面を参照しながら詳細に説明する。
図１は、排熱回収ボイラ１０の構成を示す図である。同図に示すように、排熱回収ボイラ１０は、煙道６０内に設けられた低圧側節炭器２０、低圧側蒸発器２１、高圧側節炭器３０、及び高圧側蒸発器３１と、煙道６０外に設けられた低圧側ドラム２２、高圧側ドラム３２、過熱器４０、低圧側ポンプ５０、及び高圧側ポンプ５１と、を含んで構成される。
Hereinafter, an embodiment of a pipe repair method for a heat exchanger according to the present invention will be described in detail with reference to the drawings, taking as an example the case of repairing a economizer.
FIG. 1 is a diagram illustrating a configuration of an exhaust heat recovery boiler 10. As shown in the figure, the exhaust heat recovery boiler 10 includes a low-pressure side economizer 20, a low-pressure side evaporator 21, a high-pressure side economizer 30, and a high-pressure side evaporator 31 provided in the flue 60, The low pressure side drum 22, the high pressure side drum 32, the superheater 40, the low pressure side pump 50, and the high pressure side pump 51 provided outside the flue 60 are configured.
排熱回収ボイラ１０は、煙道６０内に燃焼排ガスが供給され、排ガスの流れに沿って過熱器４０、高圧側蒸発器３１、高圧側節炭器３０、低圧側蒸発器２１、低圧側節炭器２０の順序で配置されている。ガスタービンから排出された高温の排ガスの熱は、過熱器４０、高圧側蒸発器３１、高圧側節炭器３０、低圧側蒸発器２１、及び低圧側節炭器２０において内部を流れる水との間で熱交換が行われる。なお、低圧側節炭器２０の詳細な構成は後に詳述する。 In the exhaust heat recovery boiler 10, combustion exhaust gas is supplied into the flue 60, and along the flow of the exhaust gas, the superheater 40, the high-pressure side evaporator 31, the high-pressure side economizer 30, the low-pressure side evaporator 21, and the low-pressure side node. They are arranged in the order of the charcoal units 20. The heat of the high-temperature exhaust gas discharged from the gas turbine is exchanged with water flowing in the superheater 40, the high-pressure side evaporator 31, the high-pressure side economizer 30, the low-pressure side evaporator 21, and the low-pressure side economizer 20. Heat exchange takes place between them. The detailed configuration of the low-pressure side economizer 20 will be described in detail later.
低圧側ポンプ５０から圧送された水は、低圧側節炭器２０において排ガスにより加熱されて低圧側蒸発器２１へと送られ、低圧側蒸発器２１において排ガスにより加熱されて水蒸気が発生する。そして、低圧側蒸発器２１において発生した水蒸気は低圧側ドラム２２へと送られ、低圧側ドラム２２において水蒸気が分離され、分離された水蒸気はタービンへと送られる。 The water pumped from the low-pressure side pump 50 is heated by the exhaust gas in the low-pressure side economizer 20 and sent to the low-pressure side evaporator 21, and is heated by the exhaust gas in the low-pressure side evaporator 21 to generate water vapor. Then, the water vapor generated in the low-pressure side evaporator 21 is sent to the low-pressure side drum 22, the water vapor is separated in the low-pressure side drum 22, and the separated water vapor is sent to the turbine.
また、高圧側ポンプ５１から圧送された水は、高圧側節炭器３０において排ガスにより加熱されて高圧側蒸発器３１へと送られ、高圧側蒸発器３１において排ガスにより加熱されて水蒸気が発生する。そして、高圧側蒸発器３１において発生した水蒸気は高圧側ドラム３２へと送られ、高圧側ドラム３２において水蒸気が分離され、分離された水蒸気は過熱器４０で過熱されてタービンへと送られる。 The water pumped from the high-pressure side pump 51 is heated by the exhaust gas in the high-pressure side economizer 30 and sent to the high-pressure side evaporator 31, and is heated by the exhaust gas in the high-pressure side evaporator 31 to generate water vapor. . The water vapor generated in the high pressure side evaporator 31 is sent to the high pressure side drum 32, the water vapor is separated in the high pressure side drum 32, and the separated water vapor is superheated by the superheater 40 and sent to the turbine.
図２は、低圧側節炭器２０の詳細な構造を示す図であり、（Ａ）は正面図、（Ｂ）は（Ａ）におけるＩ−Ｉ断面図、（Ｃ）は（Ａ）におけるＩＩ−ＩＩ断面図である。図３は、低圧側節炭器２０の構成を示す構成図、図４は、低圧側節炭器２０を構成する配管パネル構造１００Ａの拡大断面図である。なお、図３に示すように、第１〜第４のパネル構造１００Ａ〜１００Ｄは左右に二枚並ぶが、図２（Ｂ）、（Ｃ）では一枚のみを示す。また、高圧側節炭器３０は、低圧側節炭器２０と同様の構成であるため、説明を省略する。 FIG. 2 is a diagram illustrating a detailed structure of the low-pressure side economizer 20, (A) is a front view, (B) is a cross-sectional view taken along line II in (A), and (C) is II in (A). It is -II sectional drawing. FIG. 3 is a configuration diagram showing a configuration of the low-pressure side economizer 20, and FIG. 4 is an enlarged cross-sectional view of a piping panel structure 100A that constitutes the low-pressure economizer 20. As shown in FIG. 3, the first to fourth panel structures 100A to 100D are arranged in two on the left and right, but only one is shown in FIGS. 2 (B) and 2 (C). Moreover, since the high-pressure side economizer 30 has the same configuration as the low-pressure side economizer 20, the description thereof is omitted.
図２及び図３に示すように、低圧側節炭器２０は、第１〜第４のパネル構造１００Ａ〜１００Ｄが、積層されてなる。
第１〜第３のパネル構造１００Ａ〜１００Ｃは、複数の配管１０４、１０５からなる一対の配管群１１４、１１５と、上部配管１０１と、上流側及び下流側の下部配管１０２、１０３とにより構成される。配管群１１４、１１５を構成する配管１０４は奥行き方向に複数列（本実施形態では３列）、横方向に複数列並べられている。一対の配管群１１４、１１５を構成する複数の配管１０４、１０５は、夫々その上端が上部配管１０１に接続されている。また、一方の配管群１１４を構成する複数の配管１０４の下端は上流側の下部配管１０２に接続され、他方の配管群１１５を構成する複数の配管１０５の下端は下流側の下部配管１０３に接続されている。かかる構成により、上流側の下部配管１０２に供給された水は、一方の配管群１１４の配管１０４を下方から上方に向かって流れ、上部配管１０１を通り、下流側の配管群１１５の配管１０５を上方から下方に向かって流れ、下流側の下部配管１０３より排出される。
As shown in FIGS. 2 and 3, the low-pressure side economizer 20 is formed by laminating first to fourth panel structures 100 </ b> A to 100 </ b> D.
The first to third panel structures 100A to 100C include a pair of piping groups 114 and 115 including a plurality of pipings 104 and 105, an upper piping 101, and upstream and downstream lower pipings 102 and 103. The The pipes 104 constituting the pipe groups 114 and 115 are arranged in a plurality of rows in the depth direction (three rows in this embodiment) and a plurality of rows in the horizontal direction. The upper ends of the plurality of pipes 104 and 105 constituting the pair of pipe groups 114 and 115 are connected to the upper pipe 101, respectively. Also, the lower ends of the plurality of pipes 104 constituting one pipe group 114 are connected to the lower pipe 102 on the upstream side, and the lower ends of the plurality of pipes 105 constituting the other pipe group 115 are connected to the lower pipe 103 on the downstream side. Has been. With this configuration, the water supplied to the lower pipe 102 on the upstream side flows from the lower side to the upper side of the pipe 104 of the one pipe group 114, passes through the upper pipe 101, and passes through the pipe 105 of the downstream pipe group 115. It flows downward from above and is discharged from the lower pipe 103 on the downstream side.
また、第４のパネル構造１００Ｄは、複数の配管１２４からなる配管群１２３と、配管群１２３の配管１２４の上端及び下端が夫々接続された上部配管１２２と、下部配管１２１とにより構成される。かかる構成により下部配管１２１に供給された水は、配管群１２３の配管１２４を下方から上方に向かって上部配管１２２へと流れる。 The fourth panel structure 100 </ b> D includes a pipe group 123 including a plurality of pipes 124, an upper pipe 122 to which the upper end and the lower end of the pipe 124 of the pipe group 123 are connected, and a lower pipe 121. With this configuration, the water supplied to the lower pipe 121 flows through the pipe 124 of the pipe group 123 from the lower side to the upper side to the upper pipe 122.
図２及び図３に示すように、第１のパネル構造１００Ａの下流側の下部配管１０３は、第２のパネル構造１００Ｂの上流側の下部配管１０２に接続されている。また、第２のパネル構造１００Ｂの下流側の下部配管１０３は、第３のパネル構造１００Ｃの上流側の下部配管１０２に接続されている。また、第３のパネル構造１００Ｃ下流側の下部配管１０３は、第４のパネル構造１００Ｄの下部配管１２１に接続されている。 As shown in FIGS. 2 and 3, the lower pipe 103 on the downstream side of the first panel structure 100A is connected to the lower pipe 102 on the upstream side of the second panel structure 100B. The lower pipe 103 on the downstream side of the second panel structure 100B is connected to the lower pipe 102 on the upstream side of the third panel structure 100C. Further, the lower pipe 103 on the downstream side of the third panel structure 100C is connected to the lower pipe 121 of the fourth panel structure 100D.
かかる構成により、第１のパネル構造１００Ａの上流側の下部配管１０２へ供給された水は、第１〜第４のパネル構造１００Ａ〜１００Ｄの配管群１１４、１１５，１２３を流れ、第４のパネル構造１００Ｄの上部配管１１２から排出される。この際、第１〜第４のパネル構造１００Ａ〜１００Ｄを構成する配管群１１４、１１５，１２３の間を排ガスが流通し、排ガスと配管１０４、１０５、１２４の内部を流通する水との間で熱交換が行われ、水が加熱される。 With this configuration, the water supplied to the lower pipe 102 on the upstream side of the first panel structure 100A flows through the pipe groups 114, 115, 123 of the first to fourth panel structures 100A to 100D, and the fourth panel. It is discharged from the upper pipe 112 of the structure 100D. At this time, the exhaust gas circulates between the piping groups 114, 115, and 123 constituting the first to fourth panel structures 100A to 100D, and between the exhaust gas and the water that circulates inside the pipings 104, 105, and 124. Heat exchange takes place and the water is heated.
ここで、上流側の下部配管１０２や下部配管１２１が接続される配管群１１４，１２３を構成する配管１０４、１２４の下部は、下部配管１０２、１２１を流れる水が上方に送られるため、非常に強い圧力がかかるとともに流れが乱れる。このように流れに乱れが生じるような箇所では、例えば、椎原裕美、外４名、“舶用蒸気プラント配管の流れ加速腐食によるエロージョン・コロージョン減肉について”「２．流れ腐食加速のメカニズム」、［online］、日本海事協会、［平成21年3月30日検索］、インターネット〈URL：http://www.classnk.or.jp/hp/ja/activities/rd/H17_05.pdf〉に、記載されているように、流れ腐食加速が発生しやすい。このため、下部配管１０２、１２１が接続される配管群１１４、１２３を構成する配管１０４、１２４の下部には流れ腐食加速が生じやすい。 Here, since the lower part of the pipes 104 and 124 constituting the pipe groups 114 and 123 to which the lower pipe 102 and the lower pipe 121 on the upstream side are connected, the water flowing through the lower pipes 102 and 121 is sent upward. Strong pressure is applied and the flow is disturbed. In such a place where the flow is disturbed, for example, Hiromi Shiihara and four others, “About erosion / corrosion thinning due to flow accelerated corrosion of marine steam plant piping”, “2. Mechanism of accelerated flow corrosion”, [ online], Japan Maritime Association, [March 30, 2009 search], Internet <URL: http://www.classnk.or.jp/hp/ja/activities/rd/H17_05.pdf> As shown, flow corrosion acceleration is likely to occur. For this reason, flow corrosion acceleration tends to occur in the lower part of the pipes 104 and 124 constituting the pipe groups 114 and 123 to which the lower pipes 102 and 121 are connected.
そこで、本実施形態の節炭器の補修方法は、以下のように行うこととした。なお、以下の説明では、低圧側節炭器２０の補修を行う場合について説明するが、同様に高圧側節炭器３０の補修を行うこともできる。 Therefore, the repair method for the economizer of the present embodiment is performed as follows. In addition, although the following description demonstrates the case where the low voltage | pressure side economizer 20 is repaired, the high voltage | pressure side economizer 30 can also be repaired similarly.
まず、各パネル構造１００Ａ〜１００Ｄの配管群１１４、１１５、１２３の配管１０４、１０５、１２４内にファイバスコープを挿入して、配管１０４、１０５、１２４内部の腐食の有無を確認する。そして、配管１０４、１０５、１２４に腐食が確認された場合には、補修作業を行う。なお、以下の説明では、第２のパネル構造１００Ｂの配管群１１４の奥側の配管１０４に腐食が確認された場合について説明する。 First, a fiberscope is inserted into the pipes 104, 105, and 124 of the pipe groups 114, 115, and 123 of the panel structures 100A to 100D, and the presence or absence of corrosion inside the pipes 104, 105, and 124 is confirmed. When corrosion is confirmed in the pipes 104, 105, and 124, repair work is performed. In the following description, a case will be described in which corrosion is confirmed in the pipe 104 on the back side of the pipe group 114 of the second panel structure 100B.
補修作業を行うにあたり、まず、腐食の発生が確認された配管１０４及びこの配管１０４の切断作業の障害となる配管１０４、１０５の切断位置を決定する。図５は、配管１０４、１０５の切断位置の決定方法を説明するための図であり、図６は図５のＡ部の拡大図である。図５及び図６に示すように、奥側の配管１０４に腐食が発生した場合には、腐食が発生した配管１０４よりも手前側の配管１０４、１０５も切断の対象とする。そして、同図に破線で示すように、腐食が発生した配管１０４の切断位置は腐食部分の上下に設定し、切断の対称となる各配管１０４、１０５の下方の切断位置は、腐食が生じた配管１０４の切断位置と同じ高さに、また、上方の切断位置は、奥から手前に向かって順次高くなるような位置に設定する。 そして、上記決定した位置で各配管１０４、１０５を切断する。この際、各配管１０４、１０５の上方の切断面は階段状になるように水平に切断する。 In performing the repair work, first, the pipe 104 in which the occurrence of corrosion has been confirmed, and the cutting positions of the pipes 104 and 105 that become an obstacle to the cutting work of the pipe 104 are determined. FIG. 5 is a diagram for explaining a method for determining the cutting positions of the pipes 104 and 105, and FIG. 6 is an enlarged view of a portion A in FIG. As shown in FIGS. 5 and 6, when corrosion occurs in the pipe 104 on the back side, the pipes 104 and 105 on the near side of the pipe 104 in which corrosion has occurred are also subject to cutting. And, as shown by the broken line in the figure, the cutting position of the pipe 104 where corrosion has occurred is set above and below the corroded portion, and the cutting positions below the pipes 104 and 105 that are symmetrical to the cutting are corroded. The height is set to the same height as the cutting position of the pipe 104, and the upper cutting position is set to a position that gradually increases from the back toward the front. Then, the pipes 104 and 105 are cut at the determined positions. At this time, the upper cut surfaces of the pipes 104 and 105 are horizontally cut so as to be stepped.
次に、配管１０４、１０５を切断した部分に健全な配管を接続する。ここで、上記切断した配管のうち、腐食が生じた配管以外の作業スペースを確保するために切断した配管は健全であり、再利用可能であるため、切断した部分に作業スペースを確保するために切断した配管を健全な配管として用いることができる。 Next, a sound pipe is connected to a portion where the pipes 104 and 105 are cut. Here, among the above-mentioned cut pipes, the pipes cut in order to secure a work space other than the pipe where corrosion has occurred are healthy and can be reused. The cut pipe can be used as a healthy pipe.
図７は切断した配管２００を再利用して接続する方法を説明するための図である。切断した配管２００を再利用する際には、上端部及び下端部に接続可能なように仕上げを施すため、長さが多少短くなる。そこで、図７に示すように、切断した部分に接続する配管２１０として、一列手前側の列の切断した配管２００を用いる。そして、切断した部分に適合する長さに、一列手前側の列の切断した配管２１０を加工し、加工した配管２００を接続する。なお、この際、各配管１０４、１０５の下方の切断位置を一定の高さとし、上方の切断位置を奥から手前に向かって順次高くなるように決定しており、手前側に向かって広がるような作業スペースが確保されるため、接続作業を容易に行うことができる。
以上の工程により、節炭器を補修することができる。
FIG. 7 is a view for explaining a method of reusing and connecting the cut pipe 200. When the cut pipe 200 is reused, the length is slightly shortened because finishing is performed so that the upper end and the lower end can be connected. Therefore, as shown in FIG. 7, a cut pipe 200 in the front row is used as the pipe 210 connected to the cut portion. Then, the cut pipe 210 in the front row is processed to a length suitable for the cut portion, and the processed pipe 200 is connected. At this time, the lower cutting position of each of the pipes 104 and 105 is set to a certain height, and the upper cutting position is determined so as to increase sequentially from the back to the front, so as to spread toward the front side. Since the work space is secured, connection work can be easily performed.
By the above process, the economizer can be repaired.
本実施形態によれば、切断した配管２１０のうち健全なものを再利用する際に、切断した配管２１０の上下に接続するために必要な仕上げを施すため、長さが多少短くなる。しかしながら、本実施形態では、配管１０４、１０５の上方の切断位置を奥から手前に向かって順次高くなるように決定したため、一列手前側の切断後の配管２１０を用いることで、仕上げを施しても切断した部分に必要な長さを確保することができる。 According to the present embodiment, when a healthy pipe 210 is reused, the finishing necessary for connecting the cut pipe 210 up and down is performed, so the length is somewhat shortened. However, in this embodiment, since the upper cutting positions of the pipes 104 and 105 are determined so as to increase sequentially from the back to the front, finishing can be performed by using the pipe 210 after cutting one row in front. A necessary length can be secured in the cut portion.
また、配管１０４、１０５の下方の切断位置を略同じ高さとし、上方の切断位置を奥から手前に向かって順次高くなるように決定したため、手前側に向かって広がった作業スペースを確保することができるため、スムーズな作業を行うことができる。 In addition, the lower cutting positions of the pipes 104 and 105 are set to substantially the same height, and the upper cutting positions are determined so as to increase sequentially from the back toward the front, so that it is possible to secure a work space that expands toward the front side. Therefore, smooth work can be performed.
なお、本実施形態では、配管１０４、１０５の腐食が生じた部分を除去して、健全な配管を接続する場合について説明したが、これに限らず、点検のために配管１０４、１０５を切断する場合であっても、本発明を適用できる。
また、本実施形態では、節炭器の配管の補修を行う場合について説明したが、これに限らず、蒸発器などの複数の配管が上下方向に延び、配管外部と内部の間で熱交換を行う熱交換器であれば本発明を適用できる。
In this embodiment, the case where the corroded portions of the pipes 104 and 105 are removed and a healthy pipe is connected has been described. However, the present invention is not limited thereto, and the pipes 104 and 105 are cut for inspection. Even in this case, the present invention can be applied.
In the present embodiment, the case of repairing the pipe of the economizer has been described. The present invention can be applied to any heat exchanger.
１０ 排熱回収ボイラ ２０ 低圧側節炭器
２１ 低圧側蒸発器 ２２ 低圧側ドラム
３０ 高圧側節炭器 ３１ 高圧側蒸発器
３２ 高圧側ドラム ４０ 過熱器
５０ 低圧側ポンプ ５１ 高圧側ポンプ
６０ 煙道
１００Ａ、１００Ｂ、１００Ｃ、１００Ｄ パネル構造
１０１，１１２、１２２ 上部配管 １０２ 上流側の下部配管
１０３ 下流側の下部配管 １０４、１０５ 配管
１１４、１１５、１２３ 配管群 １２１ 下部配管
２００、２１０ 配管
DESCRIPTION OF SYMBOLS 10 Waste heat recovery boiler 20 Low pressure side economizer 21 Low pressure side evaporator 22 Low pressure side drum 30 High pressure side economizer 31 High pressure side evaporator 32 High pressure side drum 40 Superheater 50 Low pressure side pump 51 High pressure side pump 60 Flue 100A , 100B, 100C, 100D Panel structure 101, 112, 122 Upper piping 102 Lower upstream piping 103 Lower downstream piping 104, 105 Piping 114, 115, 123 Piping group 121 Lower piping 200, 210 Piping
Claims (2)
前記複数の配管のうち、前記腐食が生じた配管及び当該配管よりも手前の配管を切断する切断ステップと、
前記配管の切断した部分に健全な配管を接続する接続ステップと、を備え、
前記切断ステップでは、前記腐食が生じた配管よりも手前の配管を、奥側から手前側に向かって切断する部分の長さが長くなるように切断し、
前記接続ステップでは、前記切断ステップにおいて切断した配管のうち前記腐食が生じた配管を除く配管に仕上げを施し、前記切断ステップにおいて切断した位置よりも奥側の配管の切断された部分に接続することを特徴とする熱交換器の配管の補修方法。 In a heat exchanger in which a plurality of heat exchange pipes are arranged from the front side to the back side, a method of repairing the pipe where corrosion has occurred,
Of the plurality of pipes, a cutting step for cutting the pipe where the corrosion has occurred and a pipe before the pipe;
Connecting a healthy pipe to the cut part of the pipe, and
In the cutting step, the pipe before this corroded pipe is cut so that the length of the part to be cut from the back side toward the front side becomes longer,
In the connection step, the pipes cut in the cutting step, except for the pipes that have undergone corrosion, are finished and connected to the cut portion of the pipe on the back side from the position cut in the cutting step. Repair method for heat exchanger piping.
前記切断ステップでは、前記腐食が生じた配管よりも手前の配管を、下方の切断位置が略等しい高さになり、かつ、上方の切断位置が手前側に向かって高くなるように切断することを特徴とする熱交換器の配管の補修方法。 It is a repair method of piping of the heat exchanger of Claim 1, Comprising:
In the cutting step, the pipe before the corroded pipe is cut so that the lower cutting position is substantially equal and the upper cutting position is higher toward the near side. A characteristic heat exchanger pipe repair method.
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| JP2017166792A (en) * | 2016-03-18 | 2017-09-21 | 大阪瓦斯株式会社 | Method of repairing exhaust heat recovery boiler |
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| JPH0367576U (en) * | 1989-11-06 | 1991-07-02 | ||
| JPH08159402A (en) * | 1994-12-09 | 1996-06-21 | Babcock Hitachi Kk | Boiler apparatus and method of repairing heat transfer device |
| JP2002139201A (en) * | 2000-10-31 | 2002-05-17 | Toshiba Corp | Waste heat recovery boiler and its repairing method |
| JP2007298245A (en) * | 2006-05-02 | 2007-11-15 | Babcock Hitachi Kk | Economizer and exhaust heat recovery boiler provided therewith |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367576U (en) * | 1989-11-06 | 1991-07-02 | ||
| JPH08159402A (en) * | 1994-12-09 | 1996-06-21 | Babcock Hitachi Kk | Boiler apparatus and method of repairing heat transfer device |
| JP2002139201A (en) * | 2000-10-31 | 2002-05-17 | Toshiba Corp | Waste heat recovery boiler and its repairing method |
| JP2007298245A (en) * | 2006-05-02 | 2007-11-15 | Babcock Hitachi Kk | Economizer and exhaust heat recovery boiler provided therewith |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2017166792A (en) * | 2016-03-18 | 2017-09-21 | 大阪瓦斯株式会社 | Method of repairing exhaust heat recovery boiler |
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