JP2008170093A - Finned tube type heat exchanger and its repair method - Google Patents

Finned tube type heat exchanger and its repair method Download PDF

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JP2008170093A
JP2008170093A JP2007004690A JP2007004690A JP2008170093A JP 2008170093 A JP2008170093 A JP 2008170093A JP 2007004690 A JP2007004690 A JP 2007004690A JP 2007004690 A JP2007004690 A JP 2007004690A JP 2008170093 A JP2008170093 A JP 2008170093A
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tube
heat transfer
heat exchanger
fin
steel ball
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JP4671975B2 (en
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Yoshimi Miyasako
義巳 宮迫
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Chugoku Electric Power Co Inc:The
中国電力株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a finned tube type heat exchanger and its repair method suppressing the wear of heat transfer tubes due to steel balls without interfering with the flow of gas, in the heat exchanger formed to remove soot sticking to the surface of the heat transfer tubes by a steel ball shot-cleaning method. <P>SOLUTION: The finned tube heat exchanger comprises a heat transfer tube group 2 with finned tubes 10 arranged in a casing 1 where gas containing soot flows, and a steel ball disperser 3 for dispersing steel balls 9 from above the heat transfer tube group 2. Bar-like or tubular protectors 22 are disposed between the heat transfer tube group 2 and the steel ball disperser 3, and fins 24 are provided at constant spaces around the protector 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、火力発電所の排煙脱硫装置に設置されるフィンチューブ式熱交換器及びその修理方法に関する。   The present invention relates to a finned tube heat exchanger installed in a flue gas desulfurization apparatus of a thermal power plant and a repair method thereof.
火力発電所の排煙脱硫装置に設置されるフィンチューブ式熱交換器には、伝熱管表面に付着する煤塵を除去するために、鋼球を伝熱管群の上方から散布する鋼球ショットクリーニング方式が一般的に使用されている。この鋼球ショットクリーニング方式は、鋼球を伝熱管表面に衝突させて機械的に煤塵を除去するものであるために、伝熱管が磨耗する原因となっていた。   A steel tube shot cleaning system that disperses steel balls from above the heat transfer tube group in order to remove dust adhering to the surface of the heat transfer tube in the finned tube heat exchanger installed in the flue gas desulfurization unit of the thermal power plant Is commonly used. This steel ball shot cleaning system mechanically removes dust by colliding the steel ball against the surface of the heat transfer tube, which causes the heat transfer tube to wear.
従来、鋼球による伝熱管の磨耗を抑制するために、図5及び図6に示すように、伝熱管群2の上方にダミーチューブ23や鋼球衝突防止板等のプロテクター群21を設けて、散布した鋼球が伝熱管に直接衝突するのを防止した熱交換器は知られている(例えば、特許文献1,2参照)。
また、伝熱管群の最上段と鋼球分散器との間に、格子状に形成した枠体の各ます目を夫々ホッパー状に形成し、その下端に鋼球通過孔を開孔した鋼球分散用仕切板を配置した熱交換器も知られている(例えば、特許文献3参照)。
Conventionally, in order to suppress wear of heat transfer tubes due to steel balls, as shown in FIGS. 5 and 6, a protector group 21 such as a dummy tube 23 and a steel ball collision prevention plate is provided above the heat transfer tube group 2, Heat exchangers that prevent the scattered steel balls from directly colliding with the heat transfer tubes are known (see, for example, Patent Documents 1 and 2).
In addition, a steel ball having a grid-like frame formed between the uppermost stage of the heat transfer tube group and the steel ball disperser is formed into a hopper shape, and a steel ball passage hole is formed at the lower end thereof. A heat exchanger in which a partition plate for dispersion is arranged is also known (see, for example, Patent Document 3).
特開平8−159694号公報JP-A-8-159694 実開平4−17296号公報Japanese Utility Model Publication No. 4-17296 実開昭60−154794号公報Japanese Utility Model Publication No. 60-154794
しかし、特許文献1,2に記載の熱交換器は、ダミーチューブ又は鋼球衝突防止板の間隔が広いために、散布した鋼球がダミーチューブ又は鋼球衝突防止板に接触せずに伝熱管に直接衝突する割合が多く、特に伝熱管群の上から1段及び2段目の伝熱管に磨耗が生じ易いという課題が残っていた。一方、特許文献1,2に記載の熱交換器において、ダミーチューブ又は鋼球衝突防止板の間隔を狭くすると、伝熱管群の上から下に向かうガスの流れが妨げられてガスを送るファンの圧力損失が増大するという問題がある。   However, since the heat exchangers described in Patent Documents 1 and 2 have a wide interval between the dummy tubes or the steel ball collision prevention plates, the spread steel balls do not come into contact with the dummy tubes or the steel ball collision prevention plates. In particular, there is a problem that the first and second heat transfer tubes are likely to be worn from the top of the heat transfer tube group. On the other hand, in the heat exchangers described in Patent Documents 1 and 2, when the interval between the dummy tube or the steel ball collision prevention plate is narrowed, the flow of the gas from the top to the bottom of the heat transfer tube group is hindered and the fan sends the gas. There is a problem that pressure loss increases.
また、特許文献3に記載の熱交換器は、伝熱管群の最上段と鋼球分散器との間に鋼球分散用仕切板を配置してあるために、ガスを伝熱管群の上から下に流すことができず、ガスを伝熱管群の側面方向から流入させる必要がある。このため、特許文献3に記載の熱交換器は、鋼球ショットクリーニング方式の除塵効果を最大限に発揮することができるように、ガスを伝熱管群の上から下に流すことができないという課題があった。   Moreover, since the heat exchanger of patent document 3 has arrange | positioned the steel ball dispersion | distribution partition plate between the uppermost stage of a heat exchanger tube group, and a steel ball disperser, gas is supplied from the heat exchanger tube group above. The gas cannot flow down, and it is necessary to let the gas flow in from the side surface direction of the heat transfer tube group. For this reason, the heat exchanger described in Patent Document 3 has a problem that the gas cannot flow downward from above the heat transfer tube group so that the dust removal effect of the steel ball shot cleaning method can be maximized. was there.
そこで、本発明は、鋼球ショットクリーニング方式で伝熱管表面に付着する煤塵を除去する熱交換器において、ガスの流れを妨げることなく、鋼球による伝熱管の磨耗を抑制することができるフィンチューブ式熱交換器及びその修理方法を提供するものである。   Therefore, the present invention provides a heat exchanger that removes the dust adhering to the surface of the heat transfer tube by a steel ball shot cleaning method, and can prevent the heat transfer tube from being worn by the steel ball without obstructing the gas flow. A heat exchanger and its repair method are provided.
本発明は、上記課題を解決するために、煤塵を含むガスが流れるケーシング内にフィンチューブを配置した伝熱管群と、該伝熱管群の上方から鋼球を散布する鋼球分散器を備えたフィンチューブ式熱交換器であって、前記伝熱管群と前記鋼球分散器の間に棒状又は管状のプロテクターを配置し、該プロテクターの周囲に一定の間隔でフィンを設けたフィンチューブ式熱交換器を提供するものである。   In order to solve the above-mentioned problems, the present invention includes a heat transfer tube group in which fin tubes are arranged in a casing through which gas containing dust flows, and a steel ball disperser that disperses steel balls from above the heat transfer tube group. A finned tube heat exchanger, wherein a rod-like or tubular protector is disposed between the heat transfer tube group and the steel ball disperser, and fins are provided around the protector at regular intervals. A container is provided.
また、本発明は、前記棒状又は管状のプロテクターの周囲に螺旋状にフィンを設けた請求項1に記載のフィンチューブ式熱交換器を提供するものである。   Moreover, this invention provides the finned-tube heat exchanger of Claim 1 which provided the fin helically around the said rod-shaped or tubular protector.
また、本発明は、前記プロテクターを上下2段に設け、1段目のプロテクターと2段目のプロテクターを互い違いに配置した請求項1又は2に記載のフィンチューブ式熱交換器を提供するものである。   Moreover, this invention provides the fin tube type heat exchanger of Claim 1 or 2 which provided the said protector in two steps up and down, and has arrange | positioned the 1st-stage protector and the 2nd-stage protector alternately. is there.
また、本発明は、前記伝熱管群の上から1段及び2段のフィンチューブをバイパスしてプロテクターを形成した請求項1乃至3の何れかに記載のフィンチューブ式熱交換器を提供するものである。   The present invention also provides a finned tube heat exchanger according to any one of claims 1 to 3, wherein a protector is formed by bypassing the first and second finned tubes from above the heat transfer tube group. It is.
また、本発明は、煤塵を含むガスが流れるケーシング内にフィンチューブを配置した伝熱管群と、該伝熱管群の上方から鋼球を散布する鋼球分散器を備えたフィンチューブ式熱交換器において、前記伝熱管群の上から1段及び2段のフィンチューブをバイパスし、この1段及び2段のフィンチューブをプロテクターとして使用するフィンチューブ式熱交換器の修理方法を提供するものである。   The present invention also relates to a finned tube heat exchanger including a heat transfer tube group in which fin tubes are arranged in a casing through which gas containing dust flows, and a steel ball disperser for spraying steel balls from above the heat transfer tube group. And providing a repair method for a finned tube heat exchanger that bypasses the first and second stage fin tubes from the top of the heat transfer tube group and uses the first and second stage fin tubes as a protector. .
本発明に係るフィンチューブ式熱交換器によれば、煤塵を含むガスが流れるケーシング内にフィンチューブを配置した伝熱管群と、該伝熱管群の上方から鋼球を散布する鋼球分散器を備えたフィンチューブ式熱交換器であって、前記伝熱管群と前記鋼球分散器の間に棒状又は管状のプロテクターを配置し、該プロテクターの周囲に一定の間隔でフィンを設けた構成を有することにより、散布された鋼球がプロテクター又はフィンに接触することによって鋼球がフィンチューブに直接衝突するのを防止することができ、鋼球の落下速度を低下させて鋼球によるフィンチューブの磨耗を抑制し、フィンチューブの耐用年数を延ばすことができる。また、プロテクターの周囲にフィンを設けたことにより、プロテクターの間隔を広くしてもフィンチューブの延命化が可能となり、ケーシング内のガスの流れが妨げられないから、ガスを送るファンの圧力損失を軽減することができる効果がある。   According to the finned tube heat exchanger according to the present invention, the heat transfer tube group in which the fin tube is arranged in the casing through which the gas containing dust flows, and the steel ball disperser for spraying the steel balls from above the heat transfer tube group are provided. A fin-tube heat exchanger provided with a structure in which rod-like or tubular protectors are arranged between the heat transfer tube group and the steel ball disperser, and fins are provided at regular intervals around the protector. Therefore, it is possible to prevent the steel balls from directly colliding with the fin tube by the dispersed steel balls coming into contact with the protector or the fin, and reducing the falling speed of the steel balls, thereby causing the wear of the fin tubes by the steel balls. And the service life of the fin tube can be extended. In addition, by providing fins around the protector, it is possible to extend the life of the fin tube even if the distance between the protectors is widened, and the flow of gas in the casing is not hindered. There is an effect that can be reduced.
また、本発明は、前記棒状又は管状のプロテクターの周囲に螺旋状にフィンを設けた請求項1に記載の構成を有することにより、散布された鋼球は螺旋状に設けたフィンに沿って落下するから、上から1段及び2段目の伝熱管に衝突する鋼球の落下速度を確実に低下させることができ、フィンチューブの磨耗を抑制してフィンチューブの耐用年数を延ばすことができる効果がある。   Moreover, this invention has the structure of Claim 1 which provided the fin helically around the said rod-shaped or tubular protector, and the scattered steel ball falls along the fin provided helically. Therefore, the drop speed of the steel ball colliding with the first and second stage heat transfer tubes from the top can be surely reduced, and the effect of suppressing the wear of the fin tube and extending the useful life of the fin tube There is.
また、本発明は、前記プロテクターを上下2段に設け、1段目のプロテクターと2段目のプロテクターを互い違いに配置した請求項1又は2に記載の構成を有することにより、1段目の隣接するプロテクターの間を通り抜けた鋼球は2段目のプロテクターに接触するから、散布された鋼球がプロテクター又はフィンに確実に接触することによって鋼球がフィンチューブに直接衝突するのを阻止することができる効果がある。   Moreover, this invention has the structure of Claim 1 or 2 which provided the said protector in 2 steps | paragraphs on the upper and lower sides, and arrange | positioned the 1st-stage protector and the 2nd-stage protector alternately. Since the steel balls that pass between the protectors that come in contact with the protector in the second stage, the steel balls that have been sprayed are prevented from directly colliding with the fin tube by ensuring contact with the protectors or fins. There is an effect that can.
また、本発明は、前記伝熱管群の上から1段及び2段のフィンチューブをバイパスしてプロテクターを形成した請求項1乃至3の何れかに記載の構成を有することにより、磨耗の早い1段及び2段のフィンチューブをプロテクターとして機能させることによって、3段目以降のフィンチューブの磨耗を抑制して伝熱管群の耐用年数を延ばすことができる効果がある。   Further, the present invention has a structure according to any one of claims 1 to 3, wherein the protector is formed by bypassing the first and second fin tubes from the top of the heat transfer tube group. By making the stage and the two-stage fin tubes function as protectors, it is possible to suppress the wear of the fin tubes in the third and subsequent stages and extend the useful life of the heat transfer tube group.
また、本発明に係るフィンチューブ式熱交換器の修理方法によれば、煤塵を含むガスが流れるケーシング内にフィンチューブを配置した伝熱管群と、該伝熱管群の上方から鋼球を散布する鋼球分散器を備えたフィンチューブ式熱交換器において、前記伝熱管群の上から1段及び2段のフィンチューブをバイパスし、この1段及び2段のフィンチューブをプロテクターとして使用する構成を有することにより、早く磨耗する1段及び2段のフィンチューブをバイパスしてプロテクターとして機能させ、磨耗の遅い3段目以降のフィンチューブを伝熱管として使用を継続することができ、1段及び2段のフィンチューブによって3段目以降のフィンチューブの磨耗を抑制して伝熱管群の耐用年数を延ばすことができる効果がある。   Moreover, according to the repair method for the finned tube heat exchanger according to the present invention, the heat transfer tube group in which the fin tube is arranged in the casing through which the gas containing the dust flows, and the steel balls are sprayed from above the heat transfer tube group. In the finned tube heat exchanger equipped with the steel ball disperser, the first and second fin tubes are bypassed from the top of the heat transfer tube group, and the first and second fin tubes are used as protectors. By having the first and second stage fin tubes that wear quickly, the fin tube can function as a protector, and the third and later fin tubes that wear slowly can continue to be used as heat transfer tubes. There is an effect that the wear of the fin tubes in the third and subsequent stages can be suppressed by the stepped fin tubes and the service life of the heat transfer tube group can be extended.
本発明の実施の形態を図示する実施例に基づいて説明する。
本発明に係るフィンチューブ式熱交換器は、煤塵を含むガスが流れるケーシング1内にフィンチューブ10を配置した伝熱管群2と、該伝熱管群2の上方から鋼球9を散布する鋼球分散器3を備えてあり、前記伝熱管群2と前記鋼球分散器3の間に棒状又は管状のプロテクター22を配置し、該プロテクター22の周囲に一定の間隔でフィン24を設けてある。
Embodiments of the present invention will be described based on examples shown in the drawings.
The finned tube heat exchanger according to the present invention includes a heat transfer tube group 2 in which a fin tube 10 is disposed in a casing 1 through which a gas containing dust flows, and a steel ball that disperses steel balls 9 from above the heat transfer tube group 2. A disperser 3 is provided, and a rod-like or tubular protector 22 is disposed between the heat transfer tube group 2 and the steel ball disperser 3, and fins 24 are provided around the protector 22 at regular intervals.
図1乃至図3に示す実施例において、ケーシング1の内部には、フィンチューブ10を配置して伝熱管群2を形成してあり、この伝熱管群2の上方に鋼球分散器3を設けてある。ケーシング1の上部にはガス入口7を設け、ケーシング1の下部にはガス出口8を設けてある。ケーシング1内は、排煙脱硫装置で処理される前のガスが上から下に向かって流れ、フィンチューブ10内を流れる熱媒によってガスの熱を回収して、ガスの温度を低下させるようにしてある。   In the embodiment shown in FIGS. 1 to 3, a fin tube 10 is disposed inside the casing 1 to form a heat transfer tube group 2, and a steel ball disperser 3 is provided above the heat transfer tube group 2. It is. A gas inlet 7 is provided at the upper part of the casing 1, and a gas outlet 8 is provided at the lower part of the casing 1. In the casing 1, the gas before being processed by the flue gas desulfurization apparatus flows from the top to the bottom, and the heat of the gas is recovered by the heat medium flowing in the fin tube 10 to lower the gas temperature. It is.
図3において、4は鋼球輸送機、5は鋼球分配機、6はダストセパレータである。鋼球9は、鋼球輸送機4で上部に持ち上げられ、鋼球分配機5及び鋼球分散器3を経て、伝熱管群2を形成するフィンチューブ10上に散布される。散布された鋼球9は、フィンチューブ10に衝突しながら落下して、フィンチューブ10の表面に付着した煤塵を機械的に除去することができる。煤塵を除去した鋼球9は、ケーシング1下部からダストセパレータ6に排出され、ダストセパレータ6で煤塵を分離した鋼球9は鋼球輸送機4で再び上部に持ち上げられる。   In FIG. 3, 4 is a steel ball transport machine, 5 is a steel ball distributor, and 6 is a dust separator. The steel balls 9 are lifted up by the steel ball transporter 4, and are spread on the fin tubes 10 forming the heat transfer tube group 2 through the steel ball distributor 5 and the steel ball distributor 3. The dispersed steel balls 9 fall while colliding with the fin tube 10 and can mechanically remove the dust adhering to the surface of the fin tube 10. The steel ball 9 from which the dust has been removed is discharged from the lower part of the casing 1 to the dust separator 6, and the steel ball 9 from which the dust has been separated by the dust separator 6 is lifted again by the steel ball transporter 4.
図示の実施例において、20はプロテクター群であり、図1に示すように、伝熱管群2と鋼球分散器3の間に管状のプロテクター22を上下2段に設け、1段目のプロテクター22と2段目のプロテクター22を互い違いに配置してある。プロテクター22は、鉄又は合金等の金属性の管状体からなる。また、プロテクター22の周囲には、図2に示すように、鉄又は合金等の金属性のフィン24を螺旋状に設けて、一定の間隔でフィン24を形成してある。プロテクター22の間隔は、落下する鋼球9が1段目又は2段目のプロテクター22又はフィン24に確実に接触することができるように設けてあることが好ましい。   In the illustrated embodiment, reference numeral 20 denotes a protector group. As shown in FIG. 1, a tubular protector 22 is provided in two upper and lower stages between the heat transfer tube group 2 and the steel ball disperser 3, and the first protector 22. And the second stage protectors 22 are arranged alternately. The protector 22 is made of a metallic tubular body such as iron or an alloy. Further, around the protector 22, as shown in FIG. 2, metallic fins 24 such as iron or an alloy are provided in a spiral shape, and the fins 24 are formed at regular intervals. The distance between the protectors 22 is preferably provided so that the falling steel balls 9 can reliably contact the first-stage or second-stage protectors 22 or the fins 24.
プロテクター群20は、鋼球9がプロテクター22の間を通り抜けてフィンチューブ10に直接衝突しないように、各段を互い違いに配置して2段以上に設けることが好ましい。プロテクター群20は、3段又は4段以上に設けることも可能であるが、段数を増やすとファンの圧力損失が増大するから、ファンの圧力損失を少なくでき、且つ、フィンチューブ10の磨耗を確実に低減できる2段に設けることが最も好ましい。   It is preferable that the protector group 20 is provided in two or more stages by arranging the stages in a staggered manner so that the steel balls 9 do not pass between the protectors 22 and directly collide with the fin tube 10. The protector group 20 can be provided in three stages or four or more stages. However, if the number of stages is increased, the fan pressure loss increases, so that the fan pressure loss can be reduced and the wear of the fin tube 10 is ensured. Most preferably, it is provided in two stages that can be reduced.
なお、プロテクター22は管状体に限らず、棒状体に設けることも勿論可能である。また、フィン24の形状は螺旋状に限らず、円盤形状のフィンをプロテクター22の周囲に一定間隔で設けることもでき、また、円盤形状のフィンを傾斜して設けることも可能である。   Of course, the protector 22 is not limited to a tubular body, and may be provided on a rod-shaped body. Further, the shape of the fins 24 is not limited to a spiral shape, and disk-shaped fins can be provided around the protector 22 at regular intervals, and the disk-shaped fins can be inclined.
次に、図4及び図5に基づいて、フィンチューブ式熱交換器の修理方法について説明する。
本発明に係るフィンチューブ式熱交換器の修理方法は、煤塵を含むガスが流れるケーシング1内にフィンチューブ10を配置した伝熱管群2と、該伝熱管群2の上方から鋼球9を散布する鋼球分散器3を備えたフィンチューブ式熱交換器において、前記伝熱管群2の上から1段及び2段のフィンチューブ10をバイパスし、この1段及び2段のフィンチューブをプロテクター群20として使用することができるようにしてある。
Next, based on FIG.4 and FIG.5, the repair method of a fin tube type heat exchanger is demonstrated.
The method for repairing a finned tube heat exchanger according to the present invention includes a heat transfer tube group 2 in which a fin tube 10 is disposed in a casing 1 through which gas containing dust flows, and a steel ball 9 is dispersed from above the heat transfer tube group 2. In the fin tube type heat exchanger provided with the steel ball disperser 3, the first and second fin tubes 10 are bypassed from the top of the heat transfer tube group 2, and the first and second fin tubes are connected to the protector group. 20 can be used.
図5は修理前の従来のフィンチューブ式熱交換器を示す正面図であり、図4は修理後のフィンチューブ式熱交換器の一実施例を示す正面図である。
図5に示すように、伝熱管群2は、上下方向に隣り合うフィンチューブ10の端部を交互に接続してあり、第1段のフィンチューブ10に流入した熱媒が第2段、第3段のフィンチューブへと流れ方向を変えながら順に流れるようにしてある。また、伝熱管群2の上方には、管状のダミーチューブ23からなるプロテクター群21を設けてある。
FIG. 5 is a front view showing a conventional finned tube heat exchanger before repair, and FIG. 4 is a front view showing an embodiment of the finned tube heat exchanger after repair.
As shown in FIG. 5, the heat transfer tube group 2 is formed by alternately connecting the end portions of the fin tubes 10 adjacent in the vertical direction, and the heat medium flowing into the first-stage fin tube 10 is in the second and second stages. It is made to flow in order while changing the flow direction to a three-stage fin tube. Further, a protector group 21 including a tubular dummy tube 23 is provided above the heat transfer tube group 2.
図4に示すように、伝熱管群2は、上から1段及び2段のフィンチューブ10が鋼球9の衝突などにより磨耗して、管の肉厚が交換基準値に達したときに、この1段及び2段のフィンチューブ10の互いに接続されていない端部を切断し、第1段のフィンチューブ10への流入側と第3段のフィンチューブ10への流出側をバイパス管11で接続して修理することができるようにしてある。修理後の熱交換器は、熱媒がバイパス管11を通って第3段のフィンチューブ10へ流入し、1段及び2段のフィンチューブ10を管状のプロテクター22とフィン24とからなるプロテクター群20として使用することができる。   As shown in FIG. 4, the heat transfer tube group 2 is worn when the first and second fin tubes 10 are worn by the collision of the steel balls 9 from the top, and the wall thickness of the tubes reaches the replacement reference value. The ends of the first-stage and second-stage fin tubes 10 that are not connected to each other are cut, and the inflow side to the first-stage fin tube 10 and the outflow side to the third-stage fin tube 10 are connected by a bypass pipe 11. It can be connected and repaired. In the heat exchanger after repair, the heat medium flows into the third-stage fin tube 10 through the bypass pipe 11, and the protector group including the first-stage and second-stage fin tubes 10 includes tubular protectors 22 and fins 24. 20 can be used.
また、バイパス管11は、図示しない鋼球飛散防止板内に設けることにより、1段及び2段のフィンチューブ10の切断箇所による第3段フィンチューブ10への鋼球9の直撃を防止することができる。   Further, the bypass pipe 11 is provided in a steel ball scattering prevention plate (not shown) to prevent the steel ball 9 from directly hitting the third-stage fin tube 10 due to the cut portion of the first-stage and second-stage fin tubes 10. Can do.
本発明に係るフィンチューブ式熱交換器の修理方法は、1段及び2段のフィンチューブをプロテクター群20として使用することにより、1段目のフィンチューブの磨耗速度である0.17mm/年に対して、第3段フィンチューブ10の磨耗速度を0.10mm/年に抑制することができる。従って、伝熱管群2は、第3段フィンチューブ10の管の肉厚が交換基準値に達するまで延命化が可能となり、耐用年数を従来比で1.7倍に延ばすことができる。   The method for repairing the finned tube heat exchanger according to the present invention uses the first and second stage fin tubes as the protector group 20, thereby increasing the wear rate of the first stage fin tubes to 0.17 mm / year. On the other hand, the wear rate of the third stage fin tube 10 can be suppressed to 0.10 mm / year. Accordingly, the heat transfer tube group 2 can be extended in life until the thickness of the tube of the third-stage fin tube 10 reaches the replacement reference value, and the service life can be increased by 1.7 times compared to the conventional case.
本発明に係るフィンチューブ式熱交換器の一実施例を示す一部縦断側面図。1 is a partially longitudinal side view showing an embodiment of a finned tube heat exchanger according to the present invention. その一実施例の要部を示す正面図。The front view which shows the principal part of the one Example. 鋼球ショットクリーニング方式を示す概略構成図。The schematic block diagram which shows the steel ball shot cleaning system. 本発明に係るフィンチューブ式熱交換器の他の実施例を示す正面図。The front view which shows the other Example of the fin tube type heat exchanger which concerns on this invention. 従来のフィンチューブ式熱交換器を示す正面図。The front view which shows the conventional fin tube type heat exchanger. 従来のフィンチューブ式熱交換器を示す一部縦断側面図。The partial vertical side view which shows the conventional fin tube type heat exchanger.
符号の説明Explanation of symbols
1 ケーシング
2 伝熱管群
3 鋼球分散器
4 鋼球輸送機
5 鋼球分配機
6 ダストセパレータ
7 ガス入口
8 ガス出口
9 鋼球
10 フィンチューブ
11 バイパス管
20,21 プロテクター群
22 プロテクター
23 ダミーチューブ
24 フィン
DESCRIPTION OF SYMBOLS 1 Casing 2 Heat transfer tube group 3 Steel ball disperser 4 Steel ball transport machine 5 Steel ball distribution machine 6 Dust separator 7 Gas inlet 8 Gas outlet 9 Steel ball 10 Fin tube 11 Bypass pipe 20, 21 Protector group 22 Protector 23 Dummy tube 24 fin

Claims (5)

  1. 煤塵を含むガスが流れるケーシング内にフィンチューブを配置した伝熱管群と、該伝熱管群の上方から鋼球を散布する鋼球分散器を備えたフィンチューブ式熱交換器であって、前記伝熱管群と前記鋼球分散器の間に棒状又は管状のプロテクターを配置し、該プロテクターの周囲に一定の間隔でフィンを設けたフィンチューブ式熱交換器。   A finned tube heat exchanger comprising a heat transfer tube group in which fin tubes are arranged in a casing through which gas containing dust flows, and a steel ball disperser for spraying steel balls from above the heat transfer tube group, the heat transfer tube group comprising: A finned tube heat exchanger in which a rod-like or tubular protector is disposed between a heat tube group and the steel ball disperser, and fins are provided at regular intervals around the protector.
  2. 前記棒状又は管状のプロテクターの周囲に螺旋状にフィンを設けた請求項1に記載のフィンチューブ式熱交換器。   The finned tube heat exchanger according to claim 1, wherein fins are provided spirally around the rod-like or tubular protector.
  3. 前記プロテクターを上下2段に設け、1段目のプロテクターと2段目のプロテクターを互い違いに配置した請求項1又は2に記載のフィンチューブ式熱交換器。   The fin tube heat exchanger according to claim 1 or 2, wherein the protectors are provided in two upper and lower stages, and the first stage protectors and the second stage protectors are alternately arranged.
  4. 前記伝熱管群の上から1段及び2段のフィンチューブをバイパスしてプロテクターを形成した請求項1乃至3の何れかに記載のフィンチューブ式熱交換器。   The fin tube type heat exchanger according to any one of claims 1 to 3, wherein a protector is formed by bypassing the first and second fin tubes from the top of the heat transfer tube group.
  5. 煤塵を含むガスが流れるケーシング内にフィンチューブを配置した伝熱管群と、該伝熱管群の上方から鋼球を散布する鋼球分散器を備えたフィンチューブ式熱交換器において、前記伝熱管群の上から1段及び2段のフィンチューブをバイパスし、この1段及び2段のフィンチューブをプロテクターとして使用するフィンチューブ式熱交換器の修理方法。   In a finned tube heat exchanger comprising a heat transfer tube group in which fin tubes are disposed in a casing through which gas containing dust flows, and a steel ball disperser for spraying steel balls from above the heat transfer tube group, the heat transfer tube group A method of repairing a finned-tube heat exchanger that bypasses the first and second stage fin tubes from above and uses the first and second stage fin tubes as a protector.
JP2007004690A 2007-01-12 2007-01-12 Finned tube heat exchanger and repair method thereof Active JP4671975B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0167446U (en) * 1987-10-19 1989-04-28
JPH0299273A (en) * 1988-10-03 1990-04-11 Hitachi Zosen Eng Kk Method for repairing tube of low pressure steam condenser
JPH0449788U (en) * 1990-08-24 1992-04-27

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0167446U (en) * 1987-10-19 1989-04-28
JPH0299273A (en) * 1988-10-03 1990-04-11 Hitachi Zosen Eng Kk Method for repairing tube of low pressure steam condenser
JPH0449788U (en) * 1990-08-24 1992-04-27

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