JP6766090B2 - Exhaust heat recovery boiler and cleaning method - Google Patents

Exhaust heat recovery boiler and cleaning method Download PDF

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JP6766090B2
JP6766090B2 JP2018080375A JP2018080375A JP6766090B2 JP 6766090 B2 JP6766090 B2 JP 6766090B2 JP 2018080375 A JP2018080375 A JP 2018080375A JP 2018080375 A JP2018080375 A JP 2018080375A JP 6766090 B2 JP6766090 B2 JP 6766090B2
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heat recovery
exhaust heat
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pipe
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貴行 和田
貴行 和田
博史 赤嶺
博史 赤嶺
仙市 椿▲崎▼
仙市 椿▲崎▼
直人 田上
直人 田上
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Mitsubishi Power Ltd
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Description

本発明は、排熱回収ボイラの内部を洗浄するための機構、及びその洗浄方法に関し、特に排熱回収ボイラの水処理方法をリン酸塩処理から高給水ｐＨ運用の揮発性物質処理（Ｈｉｇｈ−ＡＶＴ：Ａｌｌ Ｖｏｌａｔｉｌｅ Ｔｒｅａｔｍｅｎｔ）に転換する際に内部を洗浄するための機構を備える排熱回収ボイラ、及び、その洗浄方法に関する。 The present invention relates to a mechanism for cleaning the inside of the exhaust heat recovery boiler and a cleaning method thereof. In particular, the water treatment method of the exhaust heat recovery boiler is changed from phosphate treatment to volatile substance treatment (High-) in high water supply pH operation. AVT: All Volatile Treatment) The present invention relates to an exhaust heat recovery steam generator provided with a mechanism for cleaning the inside at the time of conversion, and a cleaning method thereof.

ガスタービンコンバインドサイクル発電プラントでは、ガスタービンの排熱を回収することを目的として排熱回収ボイラ（ＨＲＳＧ）が設置される。
従来の排熱回収ボイラでは、給水系統にアンモニアとヒドラジン、ボイラ水系統にリン酸塩を使用するリン酸塩処理が用いられていた。近年、排熱回収ボイラの入口ガスの高温化に伴い、ボイラ水処理に用いられるリン酸塩を原因とする炭素鋼製の蒸発器配管内面に酸性リン酸塩腐食やアルカリ腐食による減肉が問題となっていた。また、節炭器において、流れ加速型腐食（ＦＡＣ：Ｆｌｏｗ Ａｃｃｅｌｅｒａｔｅｄ Ｃｏｒｒｏｓｉｏｎ）によるトラブルが発生することが知られている。これらのトラブルを回避する方法として、リンを使用しないボイラ水処理方法への転換が検討された。 In a gas turbine combined cycle power plant, an exhaust heat recovery steam generator (HRSG) is installed for the purpose of recovering the exhaust heat of the gas turbine.
In the conventional exhaust heat recovery boiler, phosphate treatment using ammonia and hydrazine for the water supply system and phosphate for the boiler water system has been used. In recent years, as the temperature of the inlet gas of the exhaust heat recovery boiler has risen, there has been a problem of thinning due to acid phosphate corrosion and alkali corrosion on the inner surface of the carbon steel evaporator pipe caused by phosphate used for boiler water treatment. It was. Further, it is known that troubles occur in economizers due to flow accelerated corrosion (FAC: Flow Accelerated Corrosion). As a method of avoiding these troubles, a conversion to a boiler water treatment method that does not use phosphorus was considered.

ボイラ系統にリンを用いない水処理方法として、揮発性物質処理（ＡＶＴ：Ａｌｌ Ｖｏｌａｔｉｌｅ Ｔｒｅａｔｍｅｎｔ）がある。ＡＶＴに比べて、アンモニアの供給量を増加させ、給水ｐＨを高めに設定したＨｉｇｈ−ＡＶＴ（高ｐＨ水処理）では、配管の腐食を抑制することができる（非特許文献１）。また、Ｈｉｇｈ−ＡＶＴでは、ヒドラジンを用いない給水処理が検討されている（非特許文献２）。また、高いｐＨで給水処理を行うことにより、上述のＦＡＣを抑制することが可能となる。 As a water treatment method that does not use phosphorus in the boiler system, there is a volatile substance treatment (AVT: All Volatile Treatment). High-AVT (high pH water treatment) in which the supply amount of ammonia is increased and the water supply pH is set higher than that of AVT can suppress the corrosion of pipes (Non-Patent Document 1). Further, in High-AVT, water supply treatment without using hydrazine is being studied (Non-Patent Document 2). Further, by performing the water supply treatment at a high pH, the above-mentioned FAC can be suppressed.

リン酸塩処理時に蒸発器内面にスケールが生成した場合、化学洗浄せずにＨｉｇｈ−ＡＶＴに転換すると、スケールを起点として腐食が進行してしまう。
従って、リン酸塩処理からＨｉｇｈ−ＡＶＴへ転換するには、設備改造だけでなく、ボイラ系統の洗浄が必要である。また、Ｈｉｇｈ−ＡＶＴに合わせて、節炭器を含むボイラ系統を洗浄することにより、節炭器でのスケール付着による伝熱阻害を抑制することができる。 When scale is generated on the inner surface of the evaporator during phosphate treatment, if it is converted to High-AVT without chemical cleaning, corrosion will proceed from the scale as a starting point.
Therefore, in order to switch from phosphate treatment to High-AVT, not only equipment modification but also cleaning of the boiler system is required. Further, by cleaning the boiler system including the economizer in accordance with High-AVT, heat transfer inhibition due to scale adhesion in the economizer can be suppressed.

特許文献１は、ガスタービン及び蒸気タービンの複合発電プラントにおいて、蒸気ドラムにアルカリ性の洗浄薬品を入れガスタービンを無負荷以上の負荷運転を行うことによって排熱回収ボイラの管内を洗浄する方法を開示する。特許文献２は、排熱回収ボイラの排ガス供給口及び排ガス出口を閉塞した状態で、伝熱管内に加熱された洗浄液を流通させる洗浄方法を開示する。 Patent Document 1 discloses a method of cleaning the inside of a pipe of an exhaust heat recovery boiler by putting an alkaline cleaning chemical in a steam drum and operating the gas turbine with a load of no load or more in a combined power plant of a gas turbine and a steam turbine. To do. Patent Document 2 discloses a cleaning method in which a heated cleaning liquid is circulated in a heat transfer tube with the exhaust gas supply port and the exhaust gas outlet of the exhaust heat recovery boiler closed.

また、特許文献３は、ボイラ運転中にボイラ水系にアルドン酸またはアルドン酸塩と、キレート剤（例えばエチレンジアミン四酢酸）とを添加することにより、スケールを除去する方法を開示する。 Further, Patent Document 3 discloses a method for removing scale by adding aldonic acid or aldonic acid salt and a chelating agent (for example, ethylenediaminetetraacetic acid) to the boiler aqueous system during boiler operation.

特開平９−７９５０４号公報JP-A-9-79504 特開平１１−３７４０５号公報JP-A-11-37405A 特開２０１１−２１２５９１号公報Japanese Unexamined Patent Publication No. 2011-12591

三菱重工技報 Ｖｏｌ．５０ Ｎｏ．１ （２０１３）Mitsubishi Heavy Industries Technical Report Vol. 50 No. 1 (2013) 三菱重工技報 Ｖｏｌ．４６ Ｎｏ．２ （２００９）Mitsubishi Heavy Industries Technical Report Vol. 46 No. 2 (2009)

排熱回収ボイラの蒸発器には、放熱量の高いフィンチューブが採用されるのが一般的である。しかしながら、例えば特許文献２のように加熱された洗浄液を用いる洗浄方法では、フィンチューブにおいて洗浄液の温度低下が生じる。このため、洗浄効果が低下する。洗浄液の温度低下を抑制するためには、ボイラ系統に大規模な昇温設備を設置するか、ガスタービンを起動して排ガスによる昇温が必要である。 A fin tube having a high heat dissipation amount is generally used for the evaporator of the exhaust heat recovery boiler. However, in the cleaning method using a heated cleaning liquid as in Patent Document 2, for example, the temperature of the cleaning liquid drops in the fin tube. Therefore, the cleaning effect is reduced. In order to suppress the temperature drop of the cleaning liquid, it is necessary to install a large-scale heating facility in the boiler system or start the gas turbine to raise the temperature by exhaust gas.

また、排熱回収ボイラは複数のドラムと蒸発器とから構成されている。Ｈｉｇｈ−ＡＶＴを適用するには、全てのドラム及び蒸発器を洗浄する必要が生じる。複数のドラム及び蒸発器を洗浄するに当たっては、洗浄準備のためのコストを低減させるために洗浄系統をできる限り簡略化することが求められる。更には、洗浄に要する時間及びコスト（薬品量、人件費等）を低減させた工程で洗浄を実施する必要がある。 The exhaust heat recovery boiler is composed of a plurality of drums and an evaporator. To apply High-AVT, all drums and evaporators will need to be cleaned. In cleaning a plurality of drums and evaporators, it is required to simplify the cleaning system as much as possible in order to reduce the cost for cleaning preparation. Furthermore, it is necessary to carry out cleaning in a process that reduces the time and cost (amount of chemicals, labor cost, etc.) required for cleaning.

本発明は、上記問題に鑑みなされたものであり、水処理方法としてリン酸塩処理からＨｉｇｈ−ＡＶＴに転換する際に、低コスト且つ短時間に配管内部の洗浄することができる排熱回収ボイラ及びその洗浄方法を提供することを目的とする。 The present invention has been made in view of the above problems, and is an exhaust heat recovery boiler capable of cleaning the inside of a pipe at low cost and in a short time when converting from phosphate treatment to High-AVT as a water treatment method. And its cleaning method.

本発明の第１の態様は、蒸発器と蒸気ドラムと節炭器とを有する排熱回収部を備える排熱回収ボイラであって、前記排熱回収部内を洗浄するための洗浄部を備え、前記洗浄部は、中性の除錆剤を含む常温の洗浄液を貯蔵する貯留部と、前記洗浄液を前記排熱回収部に導くとともに前記排熱回収部から排出させる洗浄配管と、前記洗浄配管に前記洗浄液を流通させるポンプとを備える洗浄液送給部と、前記蒸気ドラム内の前記洗浄液の水位を計測する計測部と、前記洗浄配管の途中位置に設けられ、前記計測部の計測値に基づいて、前記蒸気ドラム内の前記洗浄液の所定の水位に調整するバルブとを有する。 The first aspect of the present invention is an exhaust heat recovery boiler including an exhaust heat recovery unit having an evaporator, a steam drum, and an economizer, and includes a cleaning unit for cleaning the inside of the exhaust heat recovery unit. The cleaning unit includes a storage unit that stores a cleaning liquid at room temperature containing a neutral rust remover, a cleaning pipe that guides the cleaning liquid to the exhaust heat recovery unit and discharges the cleaning liquid from the exhaust heat recovery unit, and the cleaning pipe. A cleaning liquid feeding unit including a pump for circulating the cleaning liquid, a measuring unit for measuring the water level of the cleaning liquid in the steam drum, and a measuring unit provided at an intermediate position of the cleaning pipe, based on the measured values of the measuring unit. It has a valve that adjusts the water level of the cleaning liquid in the steam drum to a predetermined level.

本発明の第２の態様は、蒸発器と蒸気ドラムと節炭器とを有する排熱回収部を備える排熱回収ボイラにおいて、前記排熱回収部内を洗浄するための洗浄方法であって、中性の除錆剤を含む常温の洗浄液が、前記蒸気ドラムが前記洗浄液で満水になるまで前記排熱回収部に供給され、前記蒸気ドラムが前記洗浄液で満水になった後に、前記排熱回収部への前記洗浄液の送給が停止されて、前記排熱回収部の内部が常温の前記洗浄液に所定時間浸漬され、前記所定時間が経過した後に、洗浄が行われた前記排熱回収部から前記洗浄液が排出される。 A second aspect of the present invention is a cleaning method for cleaning the inside of the exhaust heat recovery unit in an exhaust heat recovery boiler including an exhaust heat recovery unit having an evaporator, a steam drum, and an economizer. A cleaning liquid at room temperature containing a rust remover is supplied to the exhaust heat recovery unit until the steam drum is filled with the cleaning liquid, and after the steam drum is filled with the cleaning liquid, the exhaust heat recovery unit The feeding of the cleaning liquid to the exhaust heat recovery unit is stopped, the inside of the exhaust heat recovery unit is immersed in the cleaning liquid at room temperature for a predetermined time, and after the predetermined time has elapsed, the exhaust heat recovery unit that has been washed has said. The cleaning liquid is discharged.

本発明の第３の態様は、蒸発器と蒸気ドラムと節炭器とを有する排熱回収部を備える排熱回収ボイラにおいて、前記排熱回収部内を洗浄するための洗浄方法であって、中性の除錆剤を含む常温の洗浄液が、前記蒸気ドラムが前記洗浄液で満水になるまで前記排熱回収部に供給され、前記蒸気ドラムが前記洗浄液で満水になった後に、前記排熱回収部内で前記洗浄液を循環させながら、前記排熱回収部の内部が常温の前記洗浄液に所定時間浸漬され、前記所定時間が経過した後に、洗浄が行われた前記排熱回収部から前記洗浄液が排出される。 A third aspect of the present invention is a cleaning method for cleaning the inside of the exhaust heat recovery unit in an exhaust heat recovery boiler including an exhaust heat recovery unit having an evaporator, a steam drum, and an economizer. A cleaning liquid at room temperature containing a rust remover is supplied to the exhaust heat recovery unit until the steam drum is filled with the cleaning liquid, and after the steam drum is filled with the cleaning liquid, the inside of the exhaust heat recovery unit. The inside of the exhaust heat recovery unit is immersed in the cleaning liquid at room temperature for a predetermined time while circulating the cleaning liquid, and after the predetermined time elapses, the cleaning liquid is discharged from the exhaust heat recovery unit that has been washed. To.

本発明の排熱回収ボイラ及び洗浄方法は、中性の除錆剤を含む常温の洗浄液を用いて配管内部が洗浄されるため、昇温設備を設置する必要が無く、洗浄液の予熱工程が不要である。また、中性の除錆剤を含む洗浄液を使用するため、洗浄のために例えばＳＵＳ製部品などの酸に弱い付属品、装置を着脱する必要が無い。従って、洗浄に要する時間及びコストが低減される。
本発明では、洗浄工程が簡略化されている。また、蒸気ドラム内の洗浄液量を管理して洗浄を行うので、洗浄に使用する水量及び薬品量を低減させることが可能である。
特に、第２の態様の洗浄方法では、洗浄液の循環を停止した状態で配管内部を洗浄液に浸漬するので、ポンプを作動させる分の動力が低減するので有利である。 In the exhaust heat recovery boiler and the cleaning method of the present invention, since the inside of the pipe is cleaned with a cleaning liquid at room temperature containing a neutral rust remover, it is not necessary to install a temperature raising facility and a preheating step of the cleaning liquid is unnecessary. Is. Further, since a cleaning liquid containing a neutral rust remover is used, it is not necessary to attach / detach accessories and devices that are sensitive to acid, such as SUS parts, for cleaning. Therefore, the time and cost required for cleaning are reduced.
In the present invention, the cleaning process is simplified. Further, since the cleaning is performed by controlling the amount of the cleaning liquid in the steam drum, it is possible to reduce the amount of water and the amount of chemicals used for cleaning.
In particular, the cleaning method of the second aspect is advantageous because the inside of the pipe is immersed in the cleaning liquid with the circulation of the cleaning liquid stopped, so that the power for operating the pump is reduced.

第２の態様及び第３の態様は、前記排熱回収部を流通する水の処理方法をリン酸塩水処理からＨｉｇｈ−ＡＶＴ水処理に転換する際に、前記排熱回収部内を前記洗浄液で洗浄することが好ましい。 In the second aspect and the third aspect, when the method for treating water flowing through the exhaust heat recovery unit is changed from phosphate water treatment to High-AVT water treatment, the inside of the exhaust heat recovery unit is washed with the cleaning liquid. It is preferable to do so.

第１の態様において、前記洗浄配管が前記洗浄液を前記節炭器に導くことが好ましい。
第２の態様及び第３の態様において、前記節炭器に前記洗浄液が供給され、前記節炭器の内部が前記洗浄液に浸漬されることが好ましい。 In the first aspect, it is preferable that the cleaning pipe guides the cleaning liquid to the economizer.
In the second aspect and the third aspect, it is preferable that the cleaning liquid is supplied to the economizer and the inside of the economizer is immersed in the cleaning liquid.

上記態様では、節炭器内部を洗浄することができ、上述した伝熱阻害の抑制効果を得ることができる。 In the above aspect, the inside of the economizer can be cleaned, and the above-mentioned effect of suppressing heat transfer inhibition can be obtained.

第１の態様の排熱回収ボイラは、圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記洗浄液の最上流側の前記排熱回収部に前記洗浄液送給部が連結し、連絡管が前記複数の排熱回収部を直列に連結し、前記洗浄液の最下流側の前記排熱回収部に前記洗浄配管が連結し、前記ポンプが、一回の洗浄で全ての前記排熱回収部に前記洗浄液を送給しても良い。 The exhaust heat recovery boiler of the first aspect includes a plurality of the exhaust heat recovery units that generate steam having different pressures, and the cleaning liquid feeding unit is connected to the exhaust heat recovery unit on the most upstream side of the cleaning liquid. A connecting pipe connects the plurality of exhaust heat recovery units in series, the cleaning pipe is connected to the exhaust heat recovery unit on the most downstream side of the cleaning liquid, and the pump pumps all the exhaust heat in one cleaning. The cleaning liquid may be supplied to the collection unit.

第２の態様及び第３の態様の洗浄方法では、圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部が前記洗浄液の流れに対し直列に連結される排熱回収ボイラにおいて、一回の洗浄で、前記洗浄液が、前記複数の排熱回収部に送給されても良い。 In the cleaning method of the second aspect and the third aspect, the plurality of exhaust heat recovery units for generating vapors having different pressures are provided, and the plurality of exhaust heat recovery units are connected in series with the flow of the cleaning liquid. In the exhaust heat recovery boiler, the cleaning liquid may be supplied to the plurality of exhaust heat recovery units in one cleaning.

上記態様に依れば、洗浄系統が簡略であるので、設備コストが低減する。また、洗浄工程が簡素であり、洗浄に要する時間を短縮することが可能である。 According to the above aspect, since the cleaning system is simple, the equipment cost is reduced. In addition, the cleaning process is simple, and the time required for cleaning can be shortened.

第１の態様の排熱回収ボイラは、圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部の各々に前記洗浄配管が並列に連結し、前記ポンプが、一回の洗浄で全ての前記排熱回収部に前記洗浄液を送給しても良い。 The exhaust heat recovery boiler of the first aspect includes a plurality of the exhaust heat recovery units that generate steam having different pressures, the cleaning pipes are connected in parallel to each of the plurality of exhaust heat recovery units, and the pump , The cleaning liquid may be supplied to all the exhaust heat recovery units in one cleaning.

第２の態様及び第３の態様の洗浄方法では、圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部が前記洗浄液の流れに対し並列に連結される排熱回収ボイラにおいて、一回の洗浄で、前記洗浄液が前記複数の排熱回収部に送給されても良い。 In the cleaning method of the second aspect and the third aspect, the plurality of exhaust heat recovery units for generating vapors having different pressures are provided, and the plurality of exhaust heat recovery units are connected in parallel with the flow of the cleaning liquid. In the exhaust heat recovery boiler, the cleaning liquid may be supplied to the plurality of exhaust heat recovery units in one cleaning.

上記態様に依れば、洗浄系統が簡略であるので、設備コストが低減する。また、洗浄工程が簡素であり、洗浄に要する時間を短縮することが可能である。 According to the above aspect, since the cleaning system is simple, the equipment cost is reduced. In addition, the cleaning process is simple, and the time required for cleaning can be shortened.

第１の態様の排熱回収ボイラは、圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部の各々に前記洗浄配管が連結し、前記ポンプが、一回の洗浄で、前記貯留部から前記洗浄液を一つの前記排熱回収部に送給しても良い。 The exhaust heat recovery boiler of the first aspect includes a plurality of the exhaust heat recovery units that generate steam having different pressures, the cleaning pipe is connected to each of the plurality of exhaust heat recovery units, and the pump is one. The cleaning liquid may be supplied from the storage unit to one exhaust heat recovery unit in one cleaning.

第２の態様及び第３の態様の洗浄方法では、圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部が前記洗浄液の流れに対し並列に連結される排熱回収ボイラにおいて、一回の洗浄で、前記洗浄液が、一つの前記排熱回収部に送給されても良い。 In the cleaning method of the second aspect and the third aspect, the plurality of exhaust heat recovery units for generating vapors having different pressures are provided, and the plurality of exhaust heat recovery units are connected in parallel with the flow of the cleaning liquid. In the exhaust heat recovery boiler, the cleaning liquid may be supplied to one exhaust heat recovery unit in one cleaning.

上記態様の排熱回収ボイラでは、１回の洗浄で送給する洗浄液を少なくすることができる。このため、洗浄に必要な水量及び薬品量を低減させることができる。更には、洗浄液を送給するポンプは容量が小さくても十分であることから、設備コストを低減させることができる。 In the exhaust heat recovery boiler of the above aspect, the amount of cleaning liquid to be supplied in one cleaning can be reduced. Therefore, the amount of water and the amount of chemicals required for cleaning can be reduced. Further, since the pump for feeding the cleaning liquid has a small capacity, the equipment cost can be reduced.

この場合、第１の態様の排熱回収ボイラは、前記複数の排熱回収部が鉛直方向に配列され、第１の連絡管が鉛直方向に隣り合う前記蒸発器同士を直列的に連結し、第２の連絡管が鉛直方向に隣り合う前記蒸気ドラム同士を直列的に連結し、洗浄が行われた前記蒸発器内の前記洗浄液が、重力により、前記第１の連絡管を介して前記洗浄が行われた蒸発器より下側に位置する前記蒸発器に送給され、洗浄が行われた前記蒸気ドラム内の前記洗浄液が、重力により、前記第２の連絡管を介して前記洗浄が行われた蒸気ドラムより下側に位置する前記蒸気ドラムに送給される構成とすることができる。 In this case, in the exhaust heat recovery boiler of the first aspect, the plurality of exhaust heat recovery units are arranged in the vertical direction, and the first connecting pipe connects the evaporators adjacent to each other in the vertical direction in series. The cleaning liquid in the evaporator, which has been cleaned by connecting the steam drums adjacent to each other in the vertical direction in series with the second connecting pipe, is cleaned by gravity through the first connecting pipe. The cleaning liquid in the steam drum, which was fed to the evaporator located below the evaporator in which the steam drum was performed, was cleaned by gravity through the second connecting pipe. It can be configured to be fed to the steam drum located below the steam drum.

第２の態様及び第３の態様の洗浄方法では、前記複数の排熱回収部が鉛直方向に配列された排熱回収ボイラにおいて、洗浄が行われた前記蒸発器内の前記洗浄液が、重力により、該洗浄が行われた蒸発器より下側で隣り合う前記蒸発器に送給され、洗浄が行われた前記蒸気ドラム内の前記洗浄液が、重力により、該洗浄が行われた蒸気ドラムより下側で隣り合う前記蒸気ドラムに送給される。 In the cleaning method of the second aspect and the third aspect, in the exhaust heat recovery boiler in which the plurality of exhaust heat recovery units are arranged in the vertical direction, the cleaning liquid in the evaporator that has been cleaned is subjected to gravity. The cleaning liquid in the steam drum that has been fed to the adjacent steam drum below the steam drum that has been cleaned is below the steam drum that has been cleaned by gravity. It is fed to the steam drums adjacent to each other on the side.

上記の竪型排熱回収ボイラでは、各排熱回収部の鉛直方向での位置レベル差を利用して、洗浄が行われた排熱回収部内の洗浄液を別の排熱回収部に送給することが可能である。すなわち、洗浄液を移送するための動力が不要であるので、洗浄時の運転コストを更に低減させることが可能である。 In the above vertical exhaust heat recovery boiler, the cleaning liquid in the cleaned exhaust heat recovery unit is sent to another exhaust heat recovery unit by utilizing the position level difference in the vertical direction of each exhaust heat recovery unit. It is possible. That is, since the power for transferring the cleaning liquid is not required, it is possible to further reduce the operating cost at the time of cleaning.

この場合、第１の態様の排熱回収ボイラは、第１の連絡管が前記複数の排熱回収部の前記蒸発器を直列に連結し、第２の連絡管が前記複数の排熱回収部の前記蒸気ドラムを直列に連結し、前記第１の連絡管及び前記第２の連絡管の各々に移送ポンプが設置され、前記移送ポンプが、洗浄が行われた前記蒸発器内の前記洗浄液を、前記第１の連絡管を介して別の前記蒸発器に送給するとともに、洗浄が行われた前記蒸気ドラム内の前記洗浄液を、前記第２の連絡管を介して別の前記蒸気ドラムに送給する構成とすることができる。 In this case, in the exhaust heat recovery boiler of the first aspect, the first connecting pipe connects the evaporators of the plurality of exhaust heat recovery units in series, and the second connecting pipe is the plurality of exhaust heat recovery units. The steam drums are connected in series, and transfer pumps are installed in each of the first connecting pipe and the second connecting pipe, and the transfer pump uses the cleaning liquid in the evaporator to be cleaned. , The cleaning liquid in the steam drum that has been cleaned while being fed to another steam drum via the first connecting pipe is sent to another steam drum via the second connecting pipe. It can be configured to send.

第２の態様及び第３の態様の洗浄方法では、前記複数の排熱回収部の前記蒸発器が直列に連結され、前記複数の排熱回収部の前記蒸気ドラムが直列に連結され、前記蒸発器の間及び前記蒸発ボイラの間の各々に移送ポンプが設置された排熱回収ボイラにおいて、洗浄が行われた前記蒸発器内の前記洗浄液が、前記移送ポンプにより別の前記蒸発器に送給され、洗浄が行われた前記蒸気ドラム内の前記洗浄液が、前記移送ポンプにより別の前記蒸気ドラムに送給される。 In the cleaning method of the second aspect and the third aspect, the evaporators of the plurality of exhaust heat recovery units are connected in series, the steam drums of the plurality of exhaust heat recovery units are connected in series, and the evaporation. In the exhaust heat recovery boiler in which transfer pumps are installed between the vessels and between the evaporation boilers, the cleaning liquid in the evaporator that has been cleaned is supplied to another evaporator by the transfer pump. The cleaning liquid in the steam drum that has been cleaned is sent to another steam drum by the transfer pump.

移送ポンプを用いて洗浄液を排熱回収部間で移送させれば、竪型の排熱回収ボイラに限定されず、横型の排熱回収ボイラにも適用可能である。移送ポンプを利用すれば移送時間を短縮でき、洗浄時間の短縮に繋がる。また、移送ポンプは小容量のポンプでも十分であるので、移送時の動力を低減させることができる。すなわち、本態様では運転コストが更に低減する。 If the cleaning liquid is transferred between the exhaust heat recovery units using a transfer pump, it is applicable not only to the vertical type exhaust heat recovery boiler but also to the horizontal type exhaust heat recovery boiler. If a transfer pump is used, the transfer time can be shortened, which leads to a reduction in cleaning time. Further, since a small-capacity pump is sufficient as the transfer pump, the power during transfer can be reduced. That is, in this embodiment, the operating cost is further reduced.

第１の態様において、前記排熱回収部が前記節炭器にボイラ給水を供給するための給水ポンプを備え、前記給水ポンプが前記洗浄液送給部の前記ポンプとしても良い。 In the first aspect, the exhaust heat recovery unit may include a water supply pump for supplying boiler water to the economizer, and the water supply pump may be the pump of the cleaning liquid supply unit.

第２の態様及び第３の態様では、前記排熱回収部が前記節炭器にボイラ給水を供給するための給水ポンプを備える排熱回収ボイラにおいて、前記給水ポンプが前記排熱回収部に前記洗浄液を供給しても良い。 In the second aspect and the third aspect, in the exhaust heat recovery boiler in which the exhaust heat recovery unit includes a water supply pump for supplying boiler water to the economizer, the water supply pump supplies the exhaust heat recovery unit to the exhaust heat recovery unit. A cleaning liquid may be supplied.

本態様では、既設の給水ポンプを洗浄液の送給に利用するので、洗浄液の送給用のポンプを別途設置する必要が無い。すなわち、本態様に依れば設備コスト及び運転コストを低減させることができる。 In this embodiment, since the existing water supply pump is used for supplying the cleaning liquid, it is not necessary to separately install a pump for supplying the cleaning liquid. That is, according to this aspect, the equipment cost and the operating cost can be reduced.

本発明の排熱回収ボイラ及びその洗浄方法では、中性の除錆剤を含む洗浄液を使用して常温で洗浄を実施することから、昇温設備及び洗浄液の予熱工程が不要である。また、洗浄系統が簡略化され、蒸気ドラム内の洗浄液量を管理して洗浄を行うので、洗浄コスト及び洗浄時間を低減させることが可能である。 In the exhaust heat recovery boiler of the present invention and the cleaning method thereof, cleaning is performed at room temperature using a cleaning liquid containing a neutral rust remover, so that a temperature raising facility and a preheating step of the cleaning liquid are unnecessary. In addition, since the cleaning system is simplified and the amount of cleaning liquid in the steam drum is controlled for cleaning, it is possible to reduce the cleaning cost and the cleaning time.

第１実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of 1st Embodiment. 第２実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of the 2nd Embodiment. 第３実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of the 3rd Embodiment. 第４実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of 4th Embodiment. 第５実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of 5th Embodiment. 第６実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of the sixth embodiment. 第７実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of 7th Embodiment. 第８実施形態の排熱回収ボイラの配管系統図である。It is a piping system diagram of the exhaust heat recovery boiler of 8th Embodiment.

［第１実施形態］
図１は、第１実施形態に係る排熱回収ボイラの配管系統図である。第１実施形態の排熱回収ボイラ１は、ガスタービンと蒸気タービンとを備えるコンバインドサイクル発電プラントに設置される。
第１実施形態の排熱回収ボイラ１は、複数の排熱回収部を備える。なお、排熱回収部は１つとしても良い。複数の排熱回収部を設置する場合は、排熱回収部はそれぞれ異なる圧力の蒸気を発生させる。図１では、３つの排熱回収部１０ａ〜１０ｃが設置され、それぞれ相対的に高圧（排熱回収部１０ａ）、中圧（排熱回収部１０ｂ）、低圧（排熱回収部１０ｃ）の上記を発生させる。 [First Embodiment]
FIG. 1 is a piping system diagram of the exhaust heat recovery boiler according to the first embodiment. The exhaust heat recovery boiler 1 of the first embodiment is installed in a combined cycle power generation plant including a gas turbine and a steam turbine.
The exhaust heat recovery boiler 1 of the first embodiment includes a plurality of exhaust heat recovery units. The exhaust heat recovery unit may be one. When a plurality of exhaust heat recovery units are installed, the exhaust heat recovery units generate steam of different pressures. In FIG. 1, three exhaust heat recovery units 10a to 10c are installed, and the above-mentioned relatively high pressure (exhaust heat recovery unit 10a), medium pressure (exhaust heat recovery unit 10b), and low pressure (exhaust heat recovery unit 10c), respectively. To generate.

まず、コンバインドサイクル発電プラントに既設される給水系統について説明する。
排熱回収部１０ａ〜１０ｃはそれぞれ、蒸気ドラム１１ａ〜１１ｃ、蒸発器１２ａ〜１２ｃ、節炭器１３ａ〜１３ｃ及び過熱器２０ａ〜２０ｃを備える。蒸気ドラム１１ａと節炭器１３ａとが配管Ｌｗ４ａ〜Ｌｗ４ｃにより連結される。蒸気ドラム１１ａ〜１１ｃと蒸発器１２ａ〜１２ｃとが、それぞれ配管Ｌｗ５−１ａ〜Ｌｗ５−１ｃ及びＬｗ５−２ａ〜Ｌｗ５−２ｃにより連結される。 First, the existing water supply system in the combined cycle power plant will be described.
The exhaust heat recovery units 10a to 10c include steam drums 11a to 11c, evaporators 12a to 12c, economizers 13a to 13c, and superheaters 20a to 20c, respectively. The steam drum 11a and the economizer 13a are connected by pipes Lw4a to Lw4c. The steam drums 11a to 11c and the evaporators 12a to 12c are connected by pipes Lw5-1a to Lw5-1c and Lw5-2a to Lw5-2c, respectively.

復水器２は配管Ｌｗ１により低圧の排熱回収部１０ｃの節炭器１３ｃと接続する。復水器２から排出された復水（給水）は、配管Ｌｗ１の途中に設けられた復水ポンプ４によって節炭器１３ｃに送給される。配管Ｌｗ１にバルブＶ３が設置される。 The condenser 2 is connected to the economizer 13c of the low-pressure exhaust heat recovery unit 10c by the pipe Lw1. The condensate (water supply) discharged from the condenser 2 is supplied to the economizer 13c by the condensate pump 4 provided in the middle of the pipe Lw1. A valve V3 is installed in the pipe Lw1.

配管Ｌｗ１は中途位置で分岐し、配管Ｌｗ２が連結する。配管Ｌｗ２は配管Ｌｗ１に接続する。配管Ｌｗ２の途中に節炭器循環ポンプ５が設置されており、節炭器１３ｃから排出された給水の一部が節炭器１３ｃに供給される構成となっている。配管Ｌｗ２には、節炭器循環ポンプ５の上流側においてバルブＶ４が設置される。 The pipe Lw1 branches at an intermediate position, and the pipe Lw2 is connected. The pipe Lw2 is connected to the pipe Lw1. An economizer circulation pump 5 is installed in the middle of the pipe Lw2, and a part of the water supply discharged from the economizer 13c is supplied to the economizer 13c. A valve V4 is installed in the pipe Lw2 on the upstream side of the economizer circulation pump 5.

配管Ｌｗ２はバルブＶ４の上流側の途中位置で分岐し、配管Ｌｗ３が連結する。配管Ｌｗ３にバルブＶ５が設置される。配管Ｌｗ３は更に途中位置でＬｗ３−１とＬｗ３−２とに分岐し、それぞれ節炭器１３ａ，１３ｂに接続する。配管Ｌｗ３−１及びＬｗ３−２の途中に給水ポンプ１４ａ，１４ｂが設置され、節炭器１３ｃから排出された給水が節炭器１３ａ，１３ｂに送給される。なお、上記ポンプは一体型として、１つのポンプから配管Ｌｗ３−１及び配管Ｌｗ３−２に洗浄液が送給される構成としても良い。 The pipe Lw2 branches at an intermediate position on the upstream side of the valve V4, and the pipe Lw3 is connected. A valve V5 is installed in the pipe Lw3. The pipe Lw3 further branches into Lw3-1 and Lw3-2 at an intermediate position, and is connected to the economizers 13a and 13b, respectively. Water supply pumps 14a and 14b are installed in the middle of the pipes Lw3-1 and Lw3-2, and the water supplied from the economizer 13c is supplied to the economizers 13a and 13b. The pump may be integrated and the cleaning liquid may be supplied from one pump to the pipe Lw3-1 and the pipe Lw3-2.

蒸気系統は、蒸気ドラム１１ａ〜１１ｃが、それぞれ途中に過熱器２０ａ〜２０ｃが設置された配管Ｌｖ１ａ〜Ｌｖ１ｃにより蒸気タービン３に連結される構成となっている。なお、図１において、配管Ｌｖ１ｂは過熱器２０ｂの蒸気下流側で分岐し、配管Ｌｖ２が接続する。配管Ｌｖ２を通じて蒸気が、ガスタービンの冷却用としてガスタービン（不図示）に送給される。 The steam system is configured such that the steam drums 11a to 11c are connected to the steam turbine 3 by pipes Lv1a to Lv1c in which superheaters 20a to 20c are installed in the middle thereof, respectively. In FIG. 1, the pipe Lv1b branches on the steam downstream side of the superheater 20b, and the pipe Lv2 is connected. Steam is supplied to the gas turbine (not shown) for cooling the gas turbine through the pipe Lv2.

図１では、節炭器１３ａの上流側で配管Ｌｗ３−１が分岐し、配管Ｌｗ６ａが接続される。配管Ｌｗ６ａは過熱器２０ａに連結され、過熱低減のために給水が過熱器２０ａに搬送されるように構成されている。また、節炭器１３ｂの上流側で配管Ｌｗ３−２が分岐し、配管Ｌｗ６ｂが接続される。配管Ｌｗ６ｂは配管Ｌｖ１ｂの途中に向けられる再熱器２１に連結され、過熱低減のために給水が再熱器２１に搬送されるように構成されている。配管Ｌｗ６ａ及びＬｗ６ｂにそれぞれバルブＶ６，Ｖ７が設置される。 In FIG. 1, the pipe Lw3-1 branches on the upstream side of the economizer 13a, and the pipe Lw6a is connected. The pipe Lw6a is connected to the superheater 20a and is configured so that the water supply is conveyed to the superheater 20a in order to reduce overheating. Further, the pipe Lw3-2 branches on the upstream side of the economizer 13b, and the pipe Lw6b is connected. The pipe Lw6b is connected to a reheater 21 directed in the middle of the pipe Lv1b, and is configured so that water supply is conveyed to the reheater 21 in order to reduce overheating. Valves V6 and V7 are installed in the pipes Lw6a and Lw6b, respectively.

排熱回収ボイラ１の洗浄系統（洗浄部）を以下で説明する。図１は、節炭器１３ａ〜１３ｃも洗浄する例を示している。
第１実施形態の洗浄配管は、配管Ｌｃ１〜Ｌｃ４と、既存の給水系統のうち配管Ｌｗ４ａ〜Ｌｗ４ｃ、配管Ｌｗ５−１ａ〜Ｌｗ５−１ｃ、及び、配管Ｌｗ５−２ａ〜Ｌｗ５−２ｃで構成される。 The cleaning system (cleaning unit) of the exhaust heat recovery boiler 1 will be described below. FIG. 1 shows an example of cleaning the economizers 13a to 13c as well.
The cleaning pipe of the first embodiment is composed of pipes Lc1 to Lc4, pipes Lw4a to Lw4c, pipes Lw5-1a to Lw5-1c, and pipes Lw5-2a to Lw5-2c of the existing water supply system.

配管Ｌｃ１は、蒸気ドラム１１ａと配管Ｌｗ３−２とを連絡する。配管Ｌｃ２は、蒸気ドラム１１ｂと配管Ｌｗ１とを連絡する。配管Ｌｃ３は、蒸気ドラム１１ｃと配管Ｌｗ３−１とを連絡する。配管Ｌｃ１〜Ｌｃ３は、各蒸気ドラム１１ａ〜１１ｃの蒸気ドラムフランジで蒸気ドラムと接続する。蒸気ドラムは、排熱回収部１０ａ〜１０ｃの各々で最も機器配置レベルが高く、蒸気ドラムフランジは、蒸気ドラムの中央のレベルに設置される。 The pipe Lc1 connects the steam drum 11a and the pipe Lw3-2. The pipe Lc2 connects the steam drum 11b and the pipe Lw1. The pipe Lc3 connects the steam drum 11c and the pipe Lw3-1. The pipes Lc1 to Lc3 are connected to the steam drum by the steam drum flanges of the steam drums 11a to 11c. The steam drum has the highest equipment arrangement level in each of the exhaust heat recovery units 10a to 10c, and the steam drum flange is installed at the central level of the steam drum.

節炭器１３ａ〜１３ｃの洗浄を行わない場合は、配管Ｌｃ１は、配管Ｌｗ４ｂ、または、配管Ｌｗ５−１ｂに接続される。同様に、配管Ｌｃ２は配管Ｌｗ４ｃ、または、配管Ｌｗ５−１ｃに接続される。配管Ｌｃ３は、配管Ｌｗ４ａ、または、配管Ｌｗ５−１ａに接続される。 When the economizers 13a to 13c are not cleaned, the pipe Lc1 is connected to the pipe Lw4b or the pipe Lw5-1b. Similarly, the pipe Lc2 is connected to the pipe Lw4c or the pipe Lw5-1c. The pipe Lc3 is connected to the pipe Lw4a or the pipe Lw5-1a.

配管Ｌｃ３の途中位置に、バルブＶ１，Ｖ２が設置される。バルブＶ１とバルブＶ２の間に、洗浄配管内に洗浄液を流通させるための水張ポンプ３０が設置される。水張ポンプ３０は、プランジャーポンプまたはダイヤフラムポンプである。 Valves V1 and V2 are installed in the middle of the pipe Lc3. A water-filled pump 30 for circulating the cleaning liquid in the cleaning pipe is installed between the valves V1 and V2. The water-filled pump 30 is a plunger pump or a diaphragm pump.

本実施形態では、図１に示されるように、洗浄系統に洗浄液の温度を調整する手段は設置されない。 In this embodiment, as shown in FIG. 1, no means for adjusting the temperature of the cleaning liquid is installed in the cleaning system.

貯留部５０は、内部に洗浄液を貯蔵する。洗浄液は中性の除錆剤を含む水溶液である。洗浄液は貯留部５０内にて常温（室温程度、具体的に５〜５０℃、より好ましくは１５℃〜３０℃）で貯蔵されている。 The storage unit 50 stores the cleaning liquid inside. The cleaning solution is an aqueous solution containing a neutral rust remover. The cleaning liquid is stored in the storage unit 50 at room temperature (about room temperature, specifically 5 to 50 ° C., more preferably 15 ° C. to 30 ° C.).

中性の除錆剤は、キレート剤、還元剤、またはキレート剤と還元剤の混合剤であり、配管内部に付着した除去対象物（例えば、金属酸化物や金属塩などを含むスケール、さびこぶなど）を除去可能な薬剤である。キレート剤は、例えばＥＤＴＡ、ＢＡＰＴＡ、ＤＯＴＡ、ＥＤＤＳ、ＩＮＮ、ＮＴＡ、ＤＴＰＡ、ＨＥＤＴＡ、ＴＴＨＡ、ＰＤＴＡ、ＤＰＴＡ-ＯＨ、ＨＩＤＡ、ＤＨＥＧ、ＧＥＤＴＡ、ＣＭＧＡ、ＥＤＤＳなどのアミノカルボン酸やこれらの塩などのアミノカルボン酸系キレート剤、クエン酸、グルコン酸、ヒドロキシ酢酸などのオキシカルボン酸やこれらの塩などのオキシカルボン酸系キレート剤、ＡＴＭＰ、ＨＥＤＰ、ＮＴＭＰ、ＰＢＴＣ、ＥＤＴＭＰ等の有機リン酸やこれらの塩などの有機リン系キレート剤である。還元剤は、例えば、Ｆｅ２＋、Ｓｎ２＋などの各種金属イオン、亜硫酸ナトリウムなどの亜硝酸塩、シュウ酸、蟻酸、アスコルビン酸、ピロガロールなどの有機化合物、ヒドラジン、水素などである。中性の除錆剤を含む洗浄液は、ｐＨが４〜８である。また，中性の除錆剤には腐食抑制剤が添加されていても良い。 A neutral rust remover is a chelating agent, a reducing agent, or a mixture of a chelating agent and a reducing agent, and is a scale or rusty hump containing an object to be removed (for example, a metal oxide or a metal salt) adhering to the inside of a pipe. Etc.) can be removed. Chelating agents include, for example, aminocarboxylic acids such as EDTA, BAPTA, DOTA, EDDS, INN, NTA, DTPA, HEADTA, TTHA, PDTA, DPTA-OH, HIDA, DHEG, GEDTA, CMGA, EDDS, and aminos such as salts thereof. Carboxylic acid-based chelating agents, oxycarboxylic acids such as citric acid, gluconic acid, and hydroxyacetic acid, oxycarboxylic acid-based chelating agents such as salts thereof, organic phosphoric acids such as ATMP, HEDP, NTMP, PBTC, and EDTA, and salts thereof. It is an organic phosphorus chelating agent such as. The reducing agent is, for example, various metal ions such as Fe 2+ and Sn 2+ , nitrite such as sodium sulfite, organic compounds such as oxalic acid, formic acid, ascorbic acid and pyrogallol, hydrazine and hydrogen. The cleaning solution containing a neutral rust remover has a pH of 4 to 8. In addition, a corrosion inhibitor may be added to the neutral rust remover.

洗浄液は、所望の洗浄力及び洗浄時間が得られように、キレート剤、還元剤及び腐食抑制剤の濃度が適切に調整されている。 The concentration of the chelating agent, the reducing agent and the corrosion inhibitor is appropriately adjusted in the cleaning liquid so that the desired cleaning power and cleaning time can be obtained.

配管Ｌｃ４は、バルブＶ１と水張ポンプ３０との間で貯留部５０と配管Ｌｃ３とを連結する。配管Ｌｃ４の途中に、バルブＶ８及び貯留部５０内の洗浄液を配管Ｌｃ３に送給する薬注ポンプ５１が設置される。 The pipe Lc4 connects the storage unit 50 and the pipe Lc3 between the valve V1 and the water-filled pump 30. A chemical injection pump 51 that feeds the cleaning liquid in the valve V8 and the storage unit 50 to the pipe Lc3 is installed in the middle of the pipe Lc4.

各蒸気ドラム１１ａ〜１１ｃは、蒸気ドラム内の水位を計測する計測部（不図示）を備える。計測部は、各蒸気ドラム１１ａ〜１１ｃの蒸気ドラムフランジ近傍であることが好ましい。蒸気ドラムフランジは、排熱回収部１０ａ〜１０ｃ内の洗浄対象部位の中で最も機器配置レベルが高い。
若しくは、蒸発器１２ａ〜１２ｃ及び節炭器１３ａ〜１３ｃなどの洗浄対象部位に設置されるベント管またはドレン管を計測部として、ベント管またはドレン管に併設されているバルブを操作し、洗浄液の送給を確認することにより、水位を計測しても良い。洗浄対象部位の中で、ベント管は最も機器配置レベルが高く、ドレン管は、最も機器配置レベルが低い。 Each steam drum 11a to 11c includes a measuring unit (not shown) for measuring the water level in the steam drum. The measuring unit is preferably in the vicinity of the steam drum flanges of the steam drums 11a to 11c. The steam drum flange has the highest equipment arrangement level among the parts to be cleaned in the exhaust heat recovery units 10a to 10c.
Alternatively, the vent pipe or drain pipe installed at the cleaning target site such as the evaporators 12a to 12c and the economizers 13a to 13c is used as a measuring unit, and the valve attached to the vent pipe or drain pipe is operated to supply the cleaning liquid. The water level may be measured by confirming the supply. Among the parts to be cleaned, the vent pipe has the highest equipment placement level, and the drain pipe has the lowest equipment placement level.

図１の排熱回収ボイラの配管内部を洗浄する方法を以下で説明する。下記の洗浄は、１回のみ実施しても良いし、複数回実施しても良い。
洗浄液は中性である。このため、本実施形態では、洗浄前にＳＵＳ製部材を取り外す必要が無い。 A method of cleaning the inside of the piping of the exhaust heat recovery boiler of FIG. 1 will be described below. The following cleaning may be performed only once or multiple times.
The cleaning solution is neutral. Therefore, in the present embodiment, it is not necessary to remove the SUS member before cleaning.

洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、薬注ポンプ５１、及び、給水ポンプ１４ａ，１４ｂは停止されている。図１に示すようにバルブＶ１，３〜７が閉鎖され、バルブＶ２、Ｖ８が開放される。 At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, the chemical injection pump 51, and the water supply pumps 14a and 14b are stopped. As shown in FIG. 1, valves V1, 3 to 7 are closed, and valves V2 and V8 are opened.

薬注ポンプ５１が起動し、貯留部５０内の洗浄液が配管Ｌｃ４を介して配管Ｌｃ３に送給される。水張ポンプ３０が起動し、常温の洗浄液が配管Ｌｃ３から配管Ｌｗ３−１を介して節炭器１３ａに送給され、配管Ｌｗ４ａを介して蒸気ドラム１１ａに送給される。蒸気ドラム１１ａに送給された洗浄液は、配管Ｌｗ５−１ａ及び配管Ｌｗ５−２ａを通じて蒸発器１２ａ内に充填される。 The chemical injection pump 51 is activated, and the cleaning liquid in the storage unit 50 is supplied to the pipe Lc3 via the pipe Lc4. The water-filled pump 30 is activated, and the cleaning liquid at room temperature is supplied from the pipe Lc3 to the economizer 13a via the pipe Lw3-1 and to the steam drum 11a via the pipe Lw4a. The cleaning liquid supplied to the steam drum 11a is filled in the evaporator 12a through the pipe Lw5-1a and the pipe Lw5-2a.

蒸気ドラム１１ａ内の洗浄液が蒸気ドラムフランジに到達すると、洗浄液が配管Ｌｃ１に流入する。洗浄液は、配管Ｌｃ１を介して配管Ｌｗ３−２に流入する。上記と同様にして、節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに洗浄液が送給される。蒸気ドラム１１ｂ内の洗浄液が蒸気ドラムフランジに到達すると、配管Ｌｃ２を介して節炭器１３ｃ、蒸気ドラム１１ｃ及び蒸発器１２ｃに洗浄液が送給される。蒸気ドラム１１ｃ内の洗浄液が蒸気ドラムフランジに到達すると、洗浄液が配管Ｌｃ３に流入する。バルブＶ１が閉鎖されているため、各蒸気ドラム１１ａ〜１１ｃ内の水位が上昇する。 When the cleaning liquid in the steam drum 11a reaches the steam drum flange, the cleaning liquid flows into the pipe Lc1. The cleaning liquid flows into the pipe Lw3-2 via the pipe Lc1. In the same manner as described above, the cleaning liquid is supplied to the economizer 13b, the steam drum 11b and the evaporator 12b. When the cleaning liquid in the steam drum 11b reaches the steam drum flange, the cleaning liquid is supplied to the economizer 13c, the steam drum 11c, and the evaporator 12c via the pipe Lc2. When the cleaning liquid in the steam drum 11c reaches the steam drum flange, the cleaning liquid flows into the pipe Lc3. Since the valve V1 is closed, the water level in each of the steam drums 11a to 11c rises.

蒸気ドラムフランジ近傍に設置された計測部は、蒸気ドラム１１ａ〜１１ｃ内の洗浄液の水位を計測する。各蒸気ドラム１１ａ〜１１ｃで洗浄液の水位が満水に到達すると、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ２、Ｖ８が閉鎖される。 The measuring unit installed near the steam drum flange measures the water level of the cleaning liquid in the steam drums 11a to 11c. When the water level of the cleaning liquid reaches full water in each of the steam drums 11a to 11c, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V2 and V8 are closed.

ベント管またはドレン管を計測部とする場合は、計測部はベント管またはドレン管からの洗浄液の出水の有無を判断する。出水した時に各蒸気ドラム１１ａ〜１１ｃ内の洗浄液が満水になったと判断され、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ２、Ｖ８が閉鎖される。 When the vent pipe or the drain pipe is used as the measuring unit, the measuring unit determines whether or not the cleaning liquid flows out from the vent pipe or the drain pipe. When the water flows out, it is determined that the cleaning liquid in each of the steam drums 11a to 11c is full, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V2 and V8 are closed.

バルブＶ１及びバルブＶ２が閉鎖されることにより、各排熱回収部１０ａ〜１０ｃの節炭器、蒸気ドラム及び蒸発器が洗浄液に浸漬される。この状態で所定時間放置されて、漬け置き洗浄が行われる。漬け置き時間は、洗浄液中の中性の除錆剤の濃度、還元剤、腐食抑制剤などの濃度、洗浄回数等を考慮して設定される。 By closing the valves V1 and V2, the economizers, steam drums and evaporators of the waste heat recovery units 10a to 10c are immersed in the cleaning liquid. It is left in this state for a predetermined time, and then soaked and washed. The soaking time is set in consideration of the concentration of the neutral rust remover in the cleaning liquid, the concentration of the reducing agent, the corrosion inhibitor, etc., the number of cleanings, and the like.

所定時間経過後、バルブＶ１，Ｖ２が開放され、水張ポンプ３０が起動する。洗浄に使用された洗浄液は、配管Ｌｃ３の中途位置に設けられるブローライン（不図示）から系外に排出される。 After a lapse of a predetermined time, the valves V1 and V2 are opened and the water filling pump 30 is started. The cleaning liquid used for cleaning is discharged to the outside of the system from a blow line (not shown) provided at an intermediate position of the pipe Lc3.

本実施形態の洗浄方法では、洗浄系統にヒータ等の加熱器が設けられていないため、常温（室温、具体的に５〜５０℃）で洗浄が実施される。 In the cleaning method of the present embodiment, since the cleaning system is not provided with a heater such as a heater, cleaning is performed at room temperature (room temperature, specifically 5 to 50 ° C.).

図１の排熱回収ボイラの配管内部を洗浄する方法の別の例として、洗浄液に浸漬させる間に洗浄液が配管Ｌｃ１〜Ｌｃ３内で循環されても良い。この場合、浸漬の間バルブＶ１，Ｖ２を開放されるとともに水張ポンプ３０を作動させる。 As another example of the method of cleaning the inside of the pipe of the exhaust heat recovery boiler of FIG. 1, the cleaning liquid may be circulated in the pipes Lc1 to Lc3 while being immersed in the cleaning liquid. In this case, the valves V1 and V2 are opened during the immersion and the water filling pump 30 is operated.

本実施形態では、中性の除錆剤を含む常温の洗浄液を用いて配管内部が洗浄されるため、昇温設備を設置する必要が無く、洗浄液の予熱工程が不要である。また、中性の除錆剤を含む洗浄液を使用するため、洗浄のために例えばＳＵＳやＡｌ製部品などの酸に弱い付属品、装置を着脱する必要が無い。従って、洗浄に要する時間及びコストが低減される。
また、本実施形態に依れば、洗浄系統にヒータ等の加熱器が設けられていないため、常温で洗浄が実施される。本実施形態の洗浄系統は簡略である上、計測部により薬液量が管理されて洗浄が実施される。このため、洗浄液の使用量を抑えることができ、洗浄コストが低減する。また、洗浄に要する時間を削減することが可能である。 In the present embodiment, since the inside of the pipe is cleaned with a cleaning liquid at room temperature containing a neutral rust remover, it is not necessary to install a temperature raising facility and a preheating step of the cleaning liquid is unnecessary. Further, since a cleaning liquid containing a neutral rust remover is used, it is not necessary to attach / detach accessories and devices that are sensitive to acid such as SUS and Al parts for cleaning. Therefore, the time and cost required for cleaning are reduced.
Further, according to the present embodiment, since the cleaning system is not provided with a heater such as a heater, cleaning is performed at room temperature. The cleaning system of the present embodiment is simple, and the amount of the chemical solution is controlled by the measuring unit to perform cleaning. Therefore, the amount of cleaning liquid used can be suppressed, and the cleaning cost can be reduced. In addition, it is possible to reduce the time required for cleaning.

［第２実施形態］
図２は、第２実施形態に係る排熱回収ボイラの配管系統図である。図２において、図１と同じ構成には同じ符号を付す。 [Second Embodiment]
FIG. 2 is a piping system diagram of the exhaust heat recovery boiler according to the second embodiment. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals.

第２実施形態の排熱回収ボイラ１０１もコンバインドサイクル発電プラントに設置される。図２の排熱回収ボイラ１０１は、異なる圧力の上記を発生させる複数の排熱回収部を有している。 The exhaust heat recovery boiler 101 of the second embodiment is also installed in the combined cycle power generation plant. The exhaust heat recovery boiler 101 of FIG. 2 has a plurality of exhaust heat recovery units that generate the above with different pressures.

第２実施形態の排熱回収ボイラ１０１は、図１と同じ給水系統及び蒸気系統を有するが、洗浄系統が異なっている。図２は、節炭器１３ａ〜１３ｃも洗浄する例を示している。 The exhaust heat recovery boiler 101 of the second embodiment has the same water supply system and steam system as in FIG. 1, but the cleaning system is different. FIG. 2 shows an example of cleaning the economizers 13a to 13c as well.

第２実施形態の洗浄配管は、配管Ｌｃ４，Ｌｃ１１〜Ｌｃ１５と、既存の給水系統のうち配管Ｌｗ３−１，Ｌｗ３−２、配管Ｌｗ４ａ〜Ｌｗ４ｃ、配管Ｌｗ５−１ａ〜Ｌｗ５−１ｃ、及び、配管Ｌｗ５−２ａ〜Ｌｗ５−２ｃで構成される。 The cleaning pipes of the second embodiment include pipes Lc4, Lc11 to Lc15, pipes Lw3-1, Lw3-2, pipes Lw4a to Lw4c, pipes Lw5-1a to Lw5-1c, and pipe Lw5 among the existing water supply systems. It is composed of -2a to Lw5-2c.

貯留部５０、配管Ｌｃ４、バルブＶ８及び薬注ポンプ５１は、第１実施形態と同じ構成である。貯留部５０には、第１実施形態で説明した洗浄液が貯留される。 The storage unit 50, the pipe Lc4, the valve V8, and the chemical injection pump 51 have the same configuration as that of the first embodiment. The cleaning liquid described in the first embodiment is stored in the storage unit 50.

配管Ｌｃ１１は、蒸発器１２ａと配管Ｌｗ３−１とを連絡する。配管Ｌｃ１１にはバルブＶ１１及びバルブＶ１４が設置される。水張ポンプ３０は、バルブＶ１１とＶ１４との間の配管Ｌｃ１１に設置される。 The pipe Lc11 communicates the evaporator 12a with the pipe Lw3-1. A valve V11 and a valve V14 are installed in the pipe Lc11. The water-filled pump 30 is installed in the pipe Lc11 between the valves V11 and V14.

配管Ｌｃ１１のバルブＶ１４と水張ポンプ３０との間に、フィルタ（不図示）が設置されることが好ましい。 It is preferable that a filter (not shown) is installed between the valve V14 of the pipe Lc11 and the water filling pump 30.

水張ポンプ３０とバルブＶ１１との間で、配管Ｌｃ１１に配管Ｌｃ１２が連結する。配管Ｌｃ１２の一端は配管Ｌｗ３−２に連結する。配管Ｌｃ１２の途中位置にバルブＶ１２が設置される。 The pipe Lc12 is connected to the pipe Lc11 between the water-filled pump 30 and the valve V11. One end of the pipe Lc12 is connected to the pipe Lw3-2. A valve V12 is installed in the middle of the pipe Lc12.

配管Ｌｃ１１への接続位置とバルブＶ１２との間で、配管Ｌｃ１２に配管Ｌｃ１３が連結する。配管Ｌ１３の一端は配管Ｌｗ１に連結する。配管Ｌｃ１３の途中位置にバルブＶ１３が設置される。 The pipe Lc13 is connected to the pipe Lc12 between the connection position to the pipe Lc11 and the valve V12. One end of the pipe L13 is connected to the pipe Lw1. A valve V13 is installed at a position in the middle of the pipe Lc13.

配管Ｌｃ１４は蒸発器１２ｂに接続し、バルブＶ１４と水張ポンプ３０との間で配管Ｌｃ１１に接続する。配管Ｌｃ１４の途中位置にバルブＶ１５が設置される。 The pipe Lc14 is connected to the evaporator 12b, and is connected to the pipe Lc11 between the valve V14 and the water filling pump 30. A valve V15 is installed at a position in the middle of the pipe Lc14.

配管Ｌｃ１５は蒸発器１２ｃに接続し、バルブＶ１５と配管Ｌｃ１１への接続位置との間で、配管Ｌｃ１４に接続する。配管Ｌｃ１５の途中位置にバルブＶ１６が設置される。 The pipe Lc15 is connected to the evaporator 12c, and is connected to the pipe Lc14 between the valve V15 and the connection position to the pipe Lc11. A valve V16 is installed at a position in the middle of the pipe Lc15.

配管Ｌｃ１１，Ｌｃ１４，Ｌｃ１５は、機器配置レベルが低い蒸発器１２ａ〜１２ｃの入口管寄せに連結することが好ましい。入口管寄せに代えて、配管Ｌｃ１１，Ｌｃ１４，Ｌｃ１５は各蒸発器１２ａ〜１２ｃの入口管寄せに設置されるドラムレベル低減管やドレン管に連結していても良い。 The pipes Lc11, Lc14, and Lc15 are preferably connected to the inlet pipes of the evaporators 12a to 12c having a low equipment arrangement level. Instead of the inlet pipes, the pipes Lc11, Lc14, and Lc15 may be connected to a drum level reduction pipe or a drain pipe installed at the inlet pipes of the evaporators 12a to 12c.

節炭器１３ａ〜１３ｃの洗浄を行わない場合、配管Ｌｃ１１〜Ｌｃ１３は節炭器１３ａ〜１３ｃの下流側に位置する配管Ｌｗ４ａ〜Ｌｗ４ｃ、または、Ｌｗ５−１ａ〜Ｌｗ５−１ｃに接続される。 When the economizers 13a to 13c are not cleaned, the pipes Lc11 to Lc13 are connected to the pipes Lw4a to Lw4c or Lw5-1a to Lw5-1c located on the downstream side of the economizers 13a to 13c.

計測部は蒸気ドラム１１ａ〜１１ｃに設置される。あるいは、計測部は蒸発器１２ａ〜１２ｃに設置されるベント管またはドレン管を使用しても良い。 The measuring unit is installed on the steam drums 11a to 11c. Alternatively, the measuring unit may use a vent pipe or a drain pipe installed in the evaporators 12a to 12c.

本実施形態において、配管Ｌｃ１１〜Ｌｃ１５の途中に、流通する液体の温度を調整する手段は設置されない。 In the present embodiment, no means for adjusting the temperature of the flowing liquid is installed in the middle of the pipes Lc11 to Lc15.

図２の排熱回収ボイラの配管内部を洗浄する方法を以下で説明する。
洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、及び、給水ポンプ１４ａ，１４ｂは停止されている。図２に示すようにバルブＶ１２〜Ｖ１６が閉鎖され、バルブＶ８、Ｖ１１が開放される。また、バルブＶ３〜Ｖ７が閉鎖される。 A method of cleaning the inside of the piping of the exhaust heat recovery boiler of FIG. 2 will be described below.
At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, and the water supply pumps 14a and 14b are stopped. As shown in FIG. 2, the valves V12 to V16 are closed, and the valves V8 and V11 are opened. In addition, valves V3 to V7 are closed.

薬注ポンプ５１が起動し、貯留部５０内の洗浄液が配管Ｌｃ４を介して配管Ｌｃ１１に送給される。水張ポンプ３０が起動し、常温の洗浄液が配管Ｌｃ１１から配管Ｌｗ３−１、Ｌｗ４ａを介して節炭器１３ａ及び蒸気ドラム１１ａに送給される。蒸気ドラム１１ａに送給された洗浄液は、配管Ｌｗ５−１ａ及び配管Ｌｗ５−２ａを介して蒸発器１２ａ内に充填される。 The chemical injection pump 51 is activated, and the cleaning liquid in the storage unit 50 is supplied to the pipe Lc11 via the pipe Lc4. The water-filled pump 30 is activated, and the cleaning liquid at room temperature is supplied from the pipe Lc11 to the economizer 13a and the steam drum 11a via the pipes Lw3-1 and Lw4a. The cleaning liquid supplied to the steam drum 11a is filled in the evaporator 12a via the pipe Lw5-1a and the pipe Lw5-2a.

蒸気ドラム１１ａに設置された計測部は、蒸気ドラム１１ａ内の洗浄液の水位を計測する。蒸気ドラム１１ａで洗浄液の水位が満水に到達すると、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ８、Ｖ１１が閉鎖される。 The measuring unit installed on the steam drum 11a measures the water level of the cleaning liquid in the steam drum 11a. When the water level of the cleaning liquid reaches full water on the steam drum 11a, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V8 and V11 are closed.

ベント管またはドレン管を計測部とする場合は、計測部はベント管またはドレン管からの洗浄液の出水の有無を判断する。出水した時に蒸気ドラム１１ａ内の洗浄液が満水になったと判断され、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ８、Ｖ１１が閉鎖される。 When the vent pipe or the drain pipe is used as the measuring unit, the measuring unit determines whether or not the cleaning liquid flows out from the vent pipe or the drain pipe. When the water flows out, it is determined that the cleaning liquid in the steam drum 11a is full, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V8 and V11 are closed.

バルブＶ１１，Ｖ１４が閉鎖されることにより、節炭器１３ａ、蒸気ドラム１１ａ及び蒸発器１２ａが洗浄液に浸漬される。この状態で所定時間放置されて、漬け置き洗浄が行われる。漬け置き時間は、洗浄液中の中性の除錆剤の濃度、防錆剤の濃度、洗浄回数等を考慮して設定される。 By closing the valves V11 and V14, the economizer 13a, the steam drum 11a and the evaporator 12a are immersed in the cleaning liquid. It is left in this state for a predetermined time, and then soaked and washed. The soaking time is set in consideration of the concentration of the neutral rust inhibitor in the cleaning liquid, the concentration of the rust preventive agent, the number of cleanings, and the like.

所定時間経過後、バルブＶ１２及びバルブ１４が開放され、水張ポンプ３０が起動する。洗浄に使用された洗浄液は、蒸発器１２ａから配管Ｌｃ１１，Ｌｃ１２、Ｌｗ３−２，Ｌｗ４ｂ，Ｌｗ５−１ｂ，Ｌｗ５−２ｂを介して節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。計測部は蒸気ドラム１１ｂ内の水位を計測する。蒸気ドラム１１ｂが満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。配管Ｌｃ１１に設置されたフィルタは、洗浄に使用された洗浄液が排熱回収部１０ｂに送給される際に、洗浄液中に含まれる固形物を捕集する。 After a lapse of a predetermined time, the valve V12 and the valve 14 are opened, and the water filling pump 30 is started. The cleaning liquid used for cleaning is conveyed from the evaporator 12a to the economizer 13b, the steam drum 11b and the evaporator 12b via the pipes Lc11, Lc12, Lw3-2, Lw4b, Lw5-1b, Lw5-2b. The measuring unit measures the water level in the steam drum 11b. When the steam drum 11b does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage portion 50 is conveyed to the economizer 13b, the steam drum 11b, and the evaporator 12b. The filter installed in the pipe Lc11 collects solid matter contained in the cleaning liquid when the cleaning liquid used for cleaning is sent to the exhaust heat recovery unit 10b.

蒸気ドラム１１ｂが満水に到達すると、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ８、Ｖ１２，Ｖ１４が閉鎖される。これにより、節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂが漬け置き洗浄される。 When the steam drum 11b reaches full water, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V8, V12, and V14 are closed. As a result, the economizer 13b, the steam drum 11b, and the evaporator 12b are immersed and washed.

排熱回収部１０ｃも、同様の工程で洗浄液の移送及び洗浄が実施される。 The exhaust heat recovery unit 10c is also subjected to transfer and cleaning of the cleaning liquid in the same process.

洗浄の順番は上述に限られず、任意の順番で実施することができる。各排熱回収部１０ａ〜１０ｃの洗浄は１回でも良いし、複数回実施されても良い。 The order of cleaning is not limited to the above, and can be performed in any order. The cleaning of each exhaust heat recovery unit 10a to 10c may be performed once or may be performed a plurality of times.

洗浄を繰り返すと洗浄液の洗浄能力が低下する。そこで第２実施形態では、所定回数の洗浄後、あるいは、洗浄液の成分をモニタリングし中性の除錆剤などの濃度が所定値以下になった場合や洗浄液に溶解したスケール成分濃度が所定値を超えた場合に、使用済みの洗浄液が配管Ｌｃ１１の途中位置に設けられるブローライン（不図示）から系外に排出される。洗浄液の排出後は、貯留部５０から新規の洗浄液が送給される。 Repeated cleaning reduces the cleaning capacity of the cleaning solution. Therefore, in the second embodiment, after a predetermined number of cleanings, or when the concentration of the neutral rust remover or the like is equal to or less than a predetermined value by monitoring the components of the cleaning solution, or the concentration of the scale component dissolved in the cleaning solution is set to a predetermined value. When it exceeds the limit, the used cleaning liquid is discharged to the outside of the system from a blow line (not shown) provided at an intermediate position of the pipe Lc11. After the cleaning liquid is discharged, a new cleaning liquid is supplied from the storage unit 50.

図２の排熱回収ボイラの配管内部を洗浄する別の方法として、配管内部を洗浄液に浸漬させる間に洗浄液が配管内で循環されても良い。具体的に、洗浄の間、水張ポンプ３０が作動する。排熱回収部１０ａが洗浄される間はバルブＶ１１，Ｖ１４が開放され、排熱回収部１０ｂが洗浄される間はバルブＶ１２，Ｖ１５が開放され、排熱回収部１０ｃが洗浄される間はバルブＶ１３，Ｖ１６が開放される。 As another method for cleaning the inside of the pipe of the exhaust heat recovery boiler of FIG. 2, the cleaning liquid may be circulated in the pipe while the inside of the pipe is immersed in the cleaning liquid. Specifically, the water-filled pump 30 operates during cleaning. The valves V11 and V14 are opened while the exhaust heat recovery unit 10a is cleaned, the valves V12 and V15 are opened while the exhaust heat recovery unit 10b is cleaned, and the valves are opened while the exhaust heat recovery unit 10c is cleaned. V13 and V16 are released.

本実施形態の洗浄方法では、洗浄系統にヒータ等の加熱器が設けられていないため、常温で洗浄が実施される。また、本実施形態では水張ポンプ３０は各排熱回収部に洗浄液を供給できれば良い。このため、第１実施形態よりも小容量のポンプとすることができ、動力を低減することが可能である。また、第１実施形態と比較して洗浄に要する洗浄液の容積を低減（図２では１／３程度）することが可能である。 In the cleaning method of the present embodiment, since the cleaning system is not provided with a heater such as a heater, cleaning is performed at room temperature. Further, in the present embodiment, the water-filled pump 30 only needs to be able to supply a cleaning liquid to each exhaust heat recovery unit. Therefore, the pump can have a smaller capacity than that of the first embodiment, and the power can be reduced. Further, it is possible to reduce the volume of the cleaning liquid required for cleaning (about 1/3 in FIG. 2) as compared with the first embodiment.

［第３実施形態］
図３は、第３実施形態に係る排熱回収ボイラの配管系統図である。図３において、図２と同じ構成には同じ符号を付す。 [Third Embodiment]
FIG. 3 is a piping system diagram of the exhaust heat recovery boiler according to the third embodiment. In FIG. 3, the same components as those in FIG. 2 are designated by the same reference numerals.

第３実施形態の排熱回収ボイラ２０１もコンバインドサイクル発電プラントに設置される。第３実施形態の排熱回収ボイラ２０１は、竪型の排熱回収ボイラ（特開平１１−３７４０５号公報に例示される排熱回収ボイラ）である。すなわち、排熱回収ボイラ２０１は、圧力の異なる蒸気が発生する複数の排熱回収部が鉛直方向に配列される。 The exhaust heat recovery boiler 201 of the third embodiment is also installed in the combined cycle power generation plant. The exhaust heat recovery boiler 201 of the third embodiment is a vertical type exhaust heat recovery boiler (exhaust heat recovery boiler exemplified in JP-A-11-37405). That is, in the exhaust heat recovery boiler 201, a plurality of exhaust heat recovery units that generate steam having different pressures are arranged in the vertical direction.

第３実施形態の排熱回収ボイラ２０１は、図２と同じ給水系統及び蒸気系統を有するが、洗浄系統が異なっている。図３は、節炭器１３ａ〜１３ｃも洗浄する例を示している。 The exhaust heat recovery boiler 201 of the third embodiment has the same water supply system and steam system as in FIG. 2, but the cleaning system is different. FIG. 3 shows an example of cleaning the economizers 13a to 13c as well.

第３実施形態では、第２実施形態の洗浄配管に加え、配管Ｌｃ２１〜Ｌｃ２４が設置される。貯留部５０、配管Ｌｃ４、バルブＶ８及び薬注ポンプ５１は第２実施形態と同じ構成である。貯留部５０には、第１実施形態で説明した洗浄液が貯留される。 In the third embodiment, pipes Lc21 to Lc24 are installed in addition to the cleaning pipe of the second embodiment. The storage unit 50, the pipe Lc4, the valve V8, and the chemical injection pump 51 have the same configuration as that of the second embodiment. The cleaning liquid described in the first embodiment is stored in the storage unit 50.

配管Ｌｃ２１及び配管Ｌｃ２２（第１の連絡管）は、鉛直方向に隣り合う蒸発器同士を連結する。図３では鉛直方向の上側から蒸発器１２ａ、蒸発器１２ｂ、蒸発器１２ｃの順で並んでいる例である。配管Ｌｃ２１は蒸発器１２ａと蒸発器１２ｂとを連結する。配管Ｌｃ２２は蒸発器１２ｂと蒸発器１２ｃとを連結する。連結位置は、各蒸発器１２ａ〜１２ｃの入口管寄せに設けられるドラムレベル低減管６０ａ〜６０ｃであることが好ましい。配管Ｌｃ２１及び配管Ｌｃ２２により、蒸発器１２ａ〜１２ｃは洗浄液の流れに対して直列に連結されている。 The pipe Lc21 and the pipe Lc22 (first connecting pipe) connect the evaporators adjacent to each other in the vertical direction. In FIG. 3, the evaporator 12a, the evaporator 12b, and the evaporator 12c are arranged in this order from the upper side in the vertical direction. The pipe Lc21 connects the evaporator 12a and the evaporator 12b. The pipe Lc22 connects the evaporator 12b and the evaporator 12c. The connection position is preferably a drum level reduction pipe 60a to 60c provided near the inlet pipe of each evaporator 12a to 12c. The evaporators 12a to 12c are connected in series with the flow of the cleaning liquid by the pipe Lc21 and the pipe Lc22.

配管Ｌｃ２３及び配管Ｌｃ２４（第２の連絡管）は、鉛直方向に隣り合う蒸気ドラム同士を連結する。図３では鉛直方向の上側から蒸気ドラム１１ａ、蒸気ドラム１１ｂ、蒸気ドラム１１ｃの順で並んでいる例である。配管Ｌｃ２３は蒸気ドラム１１ａと蒸気ドラム１１ｂとを連結する。配管Ｌｃ２４は蒸気ドラム１１ｂと蒸気ドラム１１ｃとを連結する。連結位置は、各蒸気ドラム１１ａ〜１１ｃのドラムブロー管６１ａ〜６１ｃであることが好ましい。配管Ｌｃ２３及び配管Ｌｃ２４により、蒸気ドラム１１ａ〜１１ｃは洗浄液の流れに対して直列に連結されている。 The pipe Lc23 and the pipe Lc24 (second connecting pipe) connect steam drums adjacent to each other in the vertical direction. In FIG. 3, the steam drum 11a, the steam drum 11b, and the steam drum 11c are arranged in this order from the upper side in the vertical direction. The pipe Lc23 connects the steam drum 11a and the steam drum 11b. The pipe Lc24 connects the steam drum 11b and the steam drum 11c. The connection position is preferably the drum blow pipes 61a to 61c of the steam drums 11a to 11c. The steam drums 11a to 11c are connected in series with the flow of the cleaning liquid by the pipe Lc23 and the pipe Lc24.

配管Ｌｃ２１〜Ｌｃ２４には、途中位置にそれぞれバルブＶ２１〜Ｖ２４が設置される。
なお、蒸発器及び蒸気ドラムの鉛直方向の配列は上記に限定されない。 Valves V21 to V24 are installed in the middle positions of the pipes Lc21 to Lc24, respectively.
The vertical arrangement of the evaporator and the steam drum is not limited to the above.

図３の排熱回収ボイラの配管内部を洗浄する方法を以下で説明する。ここでは配管内部を漬け置き洗浄する方法を例に挙げて説明する。 A method of cleaning the inside of the piping of the exhaust heat recovery boiler of FIG. 3 will be described below. Here, a method of immersing and cleaning the inside of the pipe will be described as an example.

洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、及び、給水ポンプ１４ａ，１４ｂは停止されている。バルブＶ１２〜Ｖ１６、Ｖ２１〜Ｖ２４が閉鎖され、バルブＶ８、Ｖ１１が開放される。また、バルブＶ３〜Ｖ７が閉鎖される。 At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, and the water supply pumps 14a and 14b are stopped. The valves V12 to V16 and V21 to V24 are closed, and the valves V8 and V11 are opened. In addition, valves V3 to V7 are closed.

まず、第２実施形態で説明したように排熱回収部１０ａに洗浄液が送給され、排熱回収部１０ａの洗浄が行われる。 First, as described in the second embodiment, the cleaning liquid is supplied to the exhaust heat recovery unit 10a, and the exhaust heat recovery unit 10a is cleaned.

排熱回収部１０ａの洗浄後、水張ポンプ３０が起動するとともにバルブＶ１２，Ｖ１４が開放され、洗浄液が配管Ｌｃ１１，Ｌｃ１２を介して節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。 After cleaning the exhaust heat recovery unit 10a, the water filling pump 30 is started and the valves V12 and V14 are opened, and the cleaning liquid is conveyed to the economizer 13b, the steam drum 11b and the evaporator 12b via the pipes Lc11 and Lc12. ..

蒸発器１２ａは蒸発器１２ｂよりも高い位置に配置される。蒸気ドラム１１ａは蒸気ドラム１１ｂよりも高い位置に配置される。排熱回収部１０ａの洗浄後、バルブＶ２１，Ｖ２３が開放されると、重力により、洗浄液が配管Ｌｃ２１，Ｌｃ２３を介して蒸発器１２ｂ及び蒸気ドラム１１ｂに搬送される。計測部で計測される蒸気ドラム１１ｂ内の水位が満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。配管Ｌｃ１１に設置されたフィルタは、洗浄に使用された洗浄液が排熱回収部１０ｂに送給される際に、洗浄液中に含まれる固形物を捕集する。 The evaporator 12a is arranged at a higher position than the evaporator 12b. The steam drum 11a is arranged at a higher position than the steam drum 11b. When the valves V21 and V23 are opened after cleaning the exhaust heat recovery unit 10a, the cleaning liquid is conveyed to the evaporator 12b and the steam drum 11b via the pipes Lc21 and Lc23 by gravity. When the water level in the steam drum 11b measured by the measuring unit does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage unit 50 is the economizer 13b, the steam drum 11b and It is transported to the evaporator 12b. The filter installed in the pipe Lc11 collects solid matter contained in the cleaning liquid when the cleaning liquid used for cleaning is sent to the exhaust heat recovery unit 10b.

蒸気ドラム１１ｂが満水に到達すると、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ８、Ｖ１２，Ｖ１４，Ｖ２１，Ｖ２３が閉鎖される。これにより、節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂが漬け置き洗浄される。 When the steam drum 11b reaches full water, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V8, V12, V14, V21, and V23 are closed. As a result, the economizer 13b, the steam drum 11b, and the evaporator 12b are immersed and washed.

排熱回収部１０ｃも、同様の工程で洗浄液の移送及び洗浄が実施される。洗浄は任意の順番で実施することができる。各排熱回収部１０ａ〜１０ｃの洗浄は１回でも良いし、複数回実施されても良い。 The exhaust heat recovery unit 10c is also subjected to transfer and cleaning of the cleaning liquid in the same process. The cleaning can be carried out in any order. The cleaning of each exhaust heat recovery unit 10a to 10c may be performed once or may be performed a plurality of times.

第３実施形態でも、配管内部を洗浄液に浸漬させる間に、水張ポンプ３０を作動させておいて、洗浄液が配管内で循環されても良い。 Also in the third embodiment, the water filling pump 30 may be operated while the inside of the pipe is immersed in the cleaning liquid, and the cleaning liquid may be circulated in the pipe.

本実施形態の洗浄方法は、第２実施形態と比較して洗浄液の移送に要する時間を削減することができ、洗浄時間を短縮することが可能である。また、水張ポンプ３０の容積を更に低減させるとともに、洗浄液の移送に要する動力も低減させることが可能である。 The cleaning method of the present embodiment can reduce the time required for transferring the cleaning liquid as compared with the second embodiment, and can shorten the cleaning time. Further, the volume of the water-filled pump 30 can be further reduced, and the power required for transferring the cleaning liquid can also be reduced.

［第４実施形態］
図４は、第４実施形態に係る排熱回収ボイラの配管系統図である。図４において、図３と同じ構成には同じ符号を付す。 [Fourth Embodiment]
FIG. 4 is a piping system diagram of the exhaust heat recovery boiler according to the fourth embodiment. In FIG. 4, the same components as those in FIG. 3 are designated by the same reference numerals.

第４実施形態の排熱回収ボイラ３０１は、竪型に限定されず横型の場合でも適用可能である。第４実施形態の排熱回収ボイラ３０１は、配管Ｌｃ２１〜Ｌｃ２４にバルブは設置されず、移送ポンプ７１ａ〜７１ｄが設置される点で第３実施形態と異なる。第４実施形態では配管Ｌｃ２１〜Ｌｃ２４の接続に関し、竪型の排熱回収ボイラであっても各蒸発器及び蒸気ドラムの鉛直方向の配列を考慮する必要はない。 The exhaust heat recovery boiler 301 of the fourth embodiment is not limited to the vertical type and can be applied to the horizontal type. The exhaust heat recovery boiler 301 of the fourth embodiment is different from the third embodiment in that no valve is installed in the pipes Lc21 to Lc24 and transfer pumps 71a to 71d are installed. In the fourth embodiment, regarding the connection of the pipes Lc21 to Lc24, it is not necessary to consider the vertical arrangement of each evaporator and steam drum even in the vertical type exhaust heat recovery boiler.

第４実施形態の排熱回収ボイラ３０１を用いた洗浄方法は、洗浄液の移送に関して第３実施形態と異なる。第４実施形態では、排熱回収部１０ａの洗浄後、移送ポンプ７１ａ，７１ｃが起動する。これにより、蒸発器１２ａ内部の洗浄液が配管Ｌｃ２１を介して蒸発器１２ｂに搬送され、蒸気ドラム１１ａ内部の洗浄液が配管Ｌｃ２３を介して蒸気ドラム１１ｂに搬送される。また、水張ポンプ３０が起動するとともにバルブＶ１２，Ｖ１４が開放され、洗浄液が配管Ｌｃ１１，Ｌｃ１２を介して節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。計測部で計測される蒸気ドラム１１ｂ内の水位が満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。蒸気ドラム１１ｂが満水に到達すると、移送ポンプ７１ａ，７１ｃ、水張ポンプ３０及び薬注ポンプ５１が停止され、バルブＶ８、Ｖ１２，Ｖ１４が閉鎖される。これにより、節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂが漬け置き洗浄される。排熱回収部１０ｃも、同様の工程で洗浄液の移送及び洗浄が実施される。 The cleaning method using the exhaust heat recovery boiler 301 of the fourth embodiment is different from that of the third embodiment in terms of transfer of the cleaning liquid. In the fourth embodiment, the transfer pumps 71a and 71c are started after cleaning the waste heat recovery unit 10a. As a result, the cleaning liquid inside the evaporator 12a is conveyed to the evaporator 12b via the pipe Lc21, and the cleaning liquid inside the steam drum 11a is conveyed to the steam drum 11b via the pipe Lc23. Further, when the water-filled pump 30 is activated, the valves V12 and V14 are opened, and the cleaning liquid is conveyed to the economizer 13b, the steam drum 11b and the evaporator 12b via the pipes Lc11 and Lc12. When the water level in the steam drum 11b measured by the measuring unit does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage unit 50 is the economizer 13b, the steam drum 11b and It is transported to the evaporator 12b. When the steam drum 11b reaches full water, the transfer pumps 71a and 71c, the water filling pump 30 and the chemical injection pump 51 are stopped, and the valves V8, V12 and V14 are closed. As a result, the economizer 13b, the steam drum 11b, and the evaporator 12b are immersed and washed. The exhaust heat recovery unit 10c is also subjected to transfer and cleaning of the cleaning liquid in the same process.

第４実施形態でも、配管内部を洗浄液に浸漬させる間に洗浄液が配管内で循環されても良い。 Also in the fourth embodiment, the cleaning liquid may be circulated in the pipe while the inside of the pipe is immersed in the cleaning liquid.

本実施形態の洗浄方法は、第２実施形態及び第３実施形態と比較して洗浄液の移送に要する時間を削減することができ、洗浄時間を短縮することが可能である。また、第２実施形態と比較して水張ポンプ３０の容積を更に低減させるとともに、洗浄液の移送に要する動力も低減させることが可能である。 The cleaning method of the present embodiment can reduce the time required for transferring the cleaning liquid as compared with the second embodiment and the third embodiment, and can shorten the cleaning time. Further, the volume of the water-filled pump 30 can be further reduced as compared with the second embodiment, and the power required for transferring the cleaning liquid can also be reduced.

第１実施形態〜第４実施形態では、洗浄液の供給及び移送時、または、洗浄中の洗浄液の循環時において、水張ポンプ（プランジャーポンプまたはダイヤフラムポンプ）３０の動作周期を制御して、洗浄液の流れに強弱を与え（流速を短周期で変動させ）ても良い。こうすることにより洗浄効果を向上させることが可能である。 In the first to fourth embodiments, the operation cycle of the water filling pump (plunger pump or diaphragm pump) 30 is controlled during the supply and transfer of the cleaning liquid or the circulation of the cleaning liquid during cleaning to control the cleaning liquid. The strength of the flow may be given (the flow velocity is changed in a short cycle). By doing so, it is possible to improve the cleaning effect.

プランジャーポンプ及びダイヤフラムポンプでは、その動作において洗浄液を吸引しているときは洗浄液が水張ポンプ３０から送給されていない。そこで、第１実施形態〜第４実施形態の排熱回収ボイラでは、洗浄配管に自動弁（図１〜図４では図示されていない）を設ける。この自動弁はプランジャーポンプまたはダイヤフラムポンプの動作に連動する。自動弁は洗浄配管から洗浄液を抜きだし、水張ポンプ３０が洗浄液を送給しないタイミングで、洗浄液の流通方向と逆の方向に抜きだした洗浄液を送給する。このような自動弁を設けることにより、洗浄効果を向上させることが可能である。 In the plunger pump and the diaphragm pump, the cleaning liquid is not supplied from the water filling pump 30 when the cleaning liquid is sucked in the operation. Therefore, in the exhaust heat recovery boilers of the first to fourth embodiments, an automatic valve (not shown in FIGS. 1 to 4) is provided in the cleaning pipe. This automatic valve is linked to the operation of the plunger pump or diaphragm pump. The automatic valve draws out the cleaning liquid from the cleaning pipe, and at a timing when the water-filled pump 30 does not supply the cleaning liquid, supplies the extracted cleaning liquid in the direction opposite to the flow direction of the cleaning liquid. By providing such an automatic valve, it is possible to improve the cleaning effect.

第１実施形態〜第４実施形態では、洗浄配管の内側にらせん状の溝が形成されていても良い。洗浄液は、このらせん状の溝によって撹拌されながら洗浄配管及び各機器内を流通することになる。あるいは、第１実施形態〜第４実施形態の洗浄配管の途中位置に撹拌装置が設置されても良い。このような構成とすることによっても、洗浄効果を向上させることが可能である。 In the first to fourth embodiments, a spiral groove may be formed inside the cleaning pipe. The cleaning liquid flows through the cleaning pipe and each device while being agitated by the spiral groove. Alternatively, a stirring device may be installed at an intermediate position of the cleaning pipes of the first to fourth embodiments. With such a configuration, it is possible to improve the cleaning effect.

［第５実施形態］
図５は、第５実施形態に係る排熱回収ボイラの配管系統図である。図５において、図１と同じ構成には同じ符号を付す。 [Fifth Embodiment]
FIG. 5 is a piping system diagram of the exhaust heat recovery boiler according to the fifth embodiment. In FIG. 5, the same components as those in FIG. 1 are designated by the same reference numerals.

第５実施形態の排熱回収ボイラ４０１もコンバインドサイクル発電プラントに設置される。図５の排熱回収ボイラ４０１は、異なる圧力の上記を発生させる複数の排熱回収部を有している。 The exhaust heat recovery boiler 401 of the fifth embodiment is also installed in the combined cycle power generation plant. The exhaust heat recovery boiler 401 of FIG. 5 has a plurality of exhaust heat recovery units that generate the above with different pressures.

第５実施形態の排熱回収ボイラ４０１は、図１と同じ給水系統及び蒸気系統を有するが、洗浄系統が異なっている。図５は、節炭器１３ａ〜１３ｃも洗浄する例を示している。 The exhaust heat recovery boiler 401 of the fifth embodiment has the same water supply system and steam system as in FIG. 1, but the cleaning system is different. FIG. 5 shows an example of cleaning the economizers 13a to 13c as well.

第５実施形態の洗浄配管は、配管Ｌｃ４，Ｌｃ３１〜Ｌｃ３３と、既存の給水系統のうち、配管Ｌｗ１〜Ｌｗ３，Ｌｗ３−１，Ｌｗ３−２，Ｌｗ４ａ〜Ｌｗ４ｃ，Ｌｗ５−１ａ〜Ｌｗ５−１ｃ，Ｌｗ５−２ａ〜Ｌｗ５−２ｃで構成される。 The cleaning pipes of the fifth embodiment include pipes Lc4, Lc31 to Lc33, and pipes Lw1 to Lw3, Lw3-1, Lw3-2, Lw4a to Lw4c, Lw5-1a to Lw5-1c, Lw5 among the existing water supply systems. It is composed of -2a to Lw5-2c.

貯留部５０には第１実施形態と同様の洗浄液が貯留されている。 The same cleaning liquid as in the first embodiment is stored in the storage unit 50.

配管Ｌｃ３１は、蒸発器１２ａと配管Ｌｗ２とを連結する。配管Ｌｗ２での連結位置は、バルブＶ４と節炭器循環ポンプ５との間である。配管Ｌｃ３１の途中位置にバルブＶ３１，Ｖ３２が設置される。バルブＶ３１とＶ３２との間で、配管Ｌｃ４が配管Ｌｃ３１に接続する。 The pipe Lc31 connects the evaporator 12a and the pipe Lw2. The connection position in the pipe Lw2 is between the valve V4 and the economizer circulation pump 5. Valves V31 and V32 are installed in the middle of the pipe Lc31. Between the valves V31 and V32, the pipe Lc4 is connected to the pipe Lc31.

配管Ｌｃ３２は、バルブＶ３１とＶ３２との間の配管Ｌｃ３１と蒸発器１２ｂとを連結する。配管Ｌｃ３２の途中位置にバルブＶ３３が設置される。 The pipe Lc32 connects the pipe Lc31 between the valves V31 and V32 and the evaporator 12b. A valve V33 is installed at a position in the middle of the pipe Lc32.

配管Ｌｃ３３は、配管Ｌｃ３２と蒸発器１２ｃとを連結する。配管Ｌｃ３２との連結位置は、配管Ｌｃ３２が配管Ｌｃ３１に連結する位置とバルブＶ３３との間である。配管Ｌｃ３３の途中位置にバルブＶ３４が設置される。 The pipe Lc33 connects the pipe Lc32 and the evaporator 12c. The connection position with the pipe Lc32 is between the position where the pipe Lc32 is connected to the pipe Lc31 and the valve V33. A valve V34 is installed in the middle of the pipe Lc33.

第５実施形態では、第１実施形態〜第４実施形態のように水張ポンプは設置されていない。また、洗浄系統に洗浄液の温度を調整する手段は設置されない。 In the fifth embodiment, the water-filled pump is not installed as in the first to fourth embodiments. In addition, no means for adjusting the temperature of the cleaning liquid is installed in the cleaning system.

図５の排熱回収ボイラ４０１の配管内部を洗浄する方法を以下で説明する。
洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、薬注ポンプ５１及び、給水ポンプ１４ａ，１４ｂは停止されている。図５に示すようにバルブＶ３，Ｖ４，Ｖ６，Ｖ７，Ｖ３１，３３，３４が閉鎖され、バルブＶ５，Ｖ８、Ｖ３２が開放される。 A method of cleaning the inside of the pipe of the exhaust heat recovery boiler 401 of FIG. 5 will be described below.
At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, the chemical injection pump 51, and the water supply pumps 14a and 14b are stopped. As shown in FIG. 5, valves V3, V4, V6, V7, V31, 33, 34 are closed, and valves V5, V8, V32 are opened.

薬注ポンプ５１が起動し、貯留部５０内の洗浄液が配管Ｌｃ４を介して配管Ｌｃ３１に送給される。節炭器循環ポンプ５が起動し、常温の洗浄液が配管Ｌｃ３１から節炭器１３ｃに送給される。節炭器１３ｃに送給された洗浄液の一部は、配管Ｌｗ４ｃ，Ｌ５−１ｗｃ，Ｌｗ５−２ｃを介して洗浄液が蒸気ドラム１１ｃ及び蒸発器１２ｃに送給される。節炭器１３ｃに送給された洗浄液の残りは、配管Ｌｗ２，Ｌｗ３，Ｌｗ３−１，Ｌｗ４ａ、Ｌｗ５−１ａ，Ｌｗ５−２ａを介して排熱回収部１０ａに送給される。また、洗浄液は、配管Ｌｗ２，Ｌｗ３，Ｌｗ３−２，Ｌｗ４ｂ、Ｌｗ５−１ｂ，Ｌｗ５−２ｂを介して排熱回収部１０ｂに送給される。 The chemical injection pump 51 is activated, and the cleaning liquid in the storage unit 50 is supplied to the pipe Lc31 via the pipe Lc4. The economizer circulation pump 5 is activated, and the cleaning liquid at room temperature is supplied from the pipe Lc31 to the economizer 13c. A part of the cleaning liquid supplied to the economizer 13c is supplied to the steam drum 11c and the evaporator 12c via the pipes Lw4c, L5-1wc, Lw5-2c. The rest of the cleaning liquid supplied to the economizer 13c is supplied to the exhaust heat recovery unit 10a via the pipes Lw2, Lw3, Lw3-1, Lw4a, Lw5-1a, Lw5-2a. Further, the cleaning liquid is supplied to the exhaust heat recovery unit 10b via the pipes Lw2, Lw3, Lw3-2, Lw4b, Lw5-1b, Lw5-2b.

節炭器循環ポンプ５が無い場合または使用できない場合には、貯留部５０、バルブＶ８及び薬注ポンプ５１を接続する配管Ｌｃ４と、復水器２または復水器２と復水ポンプ４の間の配管Ｌｗ１とを連結する配管が設置される。そして、復水ポンプ４を起動するとともにバルブＶ３を開放して、復水ポンプ４により洗浄水を各排熱回収部１０ａ〜１０ｃに送給する。 If the coal-saving device circulation pump 5 is not available or cannot be used, the pipe Lc4 connecting the storage unit 50, the valve V8 and the chemical injection pump 51, and the condenser 2 or between the condenser 2 and the condenser pump 4 A pipe connecting the pipe Lw1 of the above is installed. Then, the condensate pump 4 is started and the valve V3 is opened, and the wash water is supplied to the waste heat recovery units 10a to 10c by the condensate pump 4.

計測部は、蒸気ドラム１１ａ〜１１ｃ内の洗浄液の水位を計測する。各蒸気ドラム１１ａ〜１１ｃで洗浄液の水位が満水に到達すると、節炭器循環ポンプ５及び薬注ポンプ５１が停止され、バルブＶ３２が閉鎖される。これにより、排熱回収部１０ａ〜１０ｃの節炭器、蒸気ドラム及び蒸発器の洗浄が開始される。 The measuring unit measures the water level of the cleaning liquid in the steam drums 11a to 11c. When the water level of the cleaning liquid reaches full water in each of the steam drums 11a to 11c, the economizer circulation pump 5 and the chemical injection pump 51 are stopped, and the valve V32 is closed. As a result, cleaning of the economizer, steam drum and evaporator of the exhaust heat recovery units 10a to 10c is started.

所定時間経過後、バルブＶ５，Ｖ３１〜Ｖ３４が開放され、節炭器循環ポンプ５が起動する。洗浄に使用された洗浄液は、配管Ｌｃ３１の中途位置に設けられるブローライン（不図示）から系外に排出される。 After a lapse of a predetermined time, the valves V5, V31 to V34 are opened, and the economizer circulation pump 5 is started. The cleaning liquid used for cleaning is discharged to the outside of the system from a blow line (not shown) provided at an intermediate position of the pipe Lc31.

本実施形態の洗浄方法では、洗浄系統にヒータ等の加熱器が設けられていないため、常温で洗浄が実施される。また本実施形態では、節炭器にボイラ給水を送給するための節炭器循環ポンプ５（場合によっては更に復水ポンプ４）を利用して洗浄液の送給を行っている。すなわち、既存の給水系統の給水ポンプを洗浄にも利用しているため、設備設置コスト及び運転コストを低減することが可能である。 In the cleaning method of the present embodiment, since the cleaning system is not provided with a heater such as a heater, cleaning is performed at room temperature. Further, in the present embodiment, the cleaning liquid is supplied by using the economizer circulation pump 5 (in some cases, the condensate pump 4) for supplying the boiler water supply to the economizer. That is, since the water supply pump of the existing water supply system is also used for cleaning, it is possible to reduce the equipment installation cost and the operation cost.

［第６実施形態］
図６は、第６実施形態に係る排熱回収ボイラの配管系統図である。図６において、図５と同じ構成には同じ符号を付す。 [Sixth Embodiment]
FIG. 6 is a piping system diagram of the exhaust heat recovery boiler according to the sixth embodiment. In FIG. 6, the same components as those in FIG. 5 are designated by the same reference numerals.

第６実施形態の排熱回収ボイラ５０１は、配管Ｌｃ４１〜Ｌｃ４３が設置される点で第５実施形態と異なる。配管Ｌｃ４１は、給水ポンプ１４ａと節炭器１３ａとの間で、配管Ｌｗ３−１と蒸発器１２ａとを連結する。配管Ｌｃ４２は、給水ポンプ１４ｂと節炭器１３ｂとの間で、配管Ｌｗ３−２と蒸発器１２ｂとを連結する。配管Ｌｃ４３は、節炭器１３ｃの上流側の配管Ｌｗ１と蒸発器１２ｃとを連結する。 The exhaust heat recovery boiler 501 of the sixth embodiment is different from the fifth embodiment in that pipes Lc41 to Lc43 are installed. The pipe Lc41 connects the pipe Lw3-1 and the evaporator 12a between the water supply pump 14a and the economizer 13a. The pipe Lc42 connects the pipe Lw3-2 and the evaporator 12b between the water supply pump 14b and the economizer 13b. The pipe Lc43 connects the pipe Lw1 on the upstream side of the economizer 13c and the evaporator 12c.

第６実施形態では、第１実施形態〜第４実施形態のように水張ポンプは設置されていない。また、洗浄系統に洗浄液の温度を調整する手段は設置されない。 In the sixth embodiment, the water-filled pump is not installed as in the first to fourth embodiments. In addition, no means for adjusting the temperature of the cleaning liquid is installed in the cleaning system.

図６の排熱回収ボイラ５０１の配管内部を洗浄する方法を以下で説明する。
洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、薬注ポンプ５１及び、給水ポンプ１４ａ，１４ｂは停止されている。図６に示すようにバルブＶ３，Ｖ４，Ｖ６，Ｖ７が閉鎖され、バルブＶ５，Ｖ８，Ｖ３１〜Ｖ３４が開放される。 A method of cleaning the inside of the pipe of the exhaust heat recovery boiler 501 of FIG. 6 will be described below.
At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, the chemical injection pump 51, and the water supply pumps 14a and 14b are stopped. As shown in FIG. 6, the valves V3, V4, V6, V7 are closed, and the valves V5, V8, V31 to V34 are opened.

薬注ポンプ５１が起動し、貯留部５０内の洗浄液が第５実施形態で説明した経路を通って各排熱回収部１０ａ〜１０ｃに送給される。本実施形態では、洗浄液は更に配管Ｌｃ４１〜Ｌｃ４３と通じて蒸発器１２ａ〜１２ｃに送給される。 The chemical injection pump 51 is activated, and the cleaning liquid in the storage unit 50 is supplied to the exhaust heat recovery units 10a to 10c through the route described in the fifth embodiment. In the present embodiment, the cleaning liquid is further fed to the evaporators 12a to 12c through the pipes Lc41 to Lc43.

計測部は、蒸気ドラム１１ａ〜１１ｃ内の洗浄液の水位を計測する。各蒸気ドラム１１ａ〜１１ｃで洗浄液の水位が満水に到達すると、バルブＶ８が閉鎖され、薬注ポンプ５１が停止される。本実施形態では節炭器循環ポンプ５、給水ポンプ１４ａ、１４ｂは停止されない。このため、洗浄液が循環されながら、節炭器、蒸気ドラム及び蒸発器が洗浄液に浸漬されて洗浄される。この時の循環量は、各ポンプのミニマムフロー（ポンプ定格容量の２５％〜３０％程度）とすることが好ましい。 The measuring unit measures the water level of the cleaning liquid in the steam drums 11a to 11c. When the water level of the cleaning liquid reaches full water in each of the steam drums 11a to 11c, the valve V8 is closed and the chemical injection pump 51 is stopped. In this embodiment, the economizer circulation pump 5 and the water supply pumps 14a and 14b are not stopped. Therefore, the economizer, the steam drum, and the evaporator are immersed in the cleaning liquid for cleaning while the cleaning liquid is circulated. The circulation amount at this time is preferably the minimum flow rate of each pump (about 25% to 30% of the rated capacity of the pump).

所定時間経過後、洗浄液は、配管Ｌｃ３１の中途位置に設けられるブローライン（不図示）から系外に排出される。 After a lapse of a predetermined time, the cleaning liquid is discharged to the outside of the system from a blow line (not shown) provided at an intermediate position of the pipe Lc31.

本実施形態は、洗浄液を循環させながら洗浄を実施するので、スケール等の除去率が向上するという効果を奏する。 Since the cleaning is performed while circulating the cleaning liquid, the present embodiment has the effect of improving the removal rate of scales and the like.

［第７実施形態］
図７は、第７実施形態に係る排熱回収ボイラの配管系統図である。図７において、図５と同じ構成には同じ符号を付す。 [7th Embodiment]
FIG. 7 is a piping system diagram of the exhaust heat recovery boiler according to the seventh embodiment. In FIG. 7, the same components as those in FIG. 5 are designated by the same reference numerals.

第７実施形態の排熱回収ボイラ６０１では、配管Ｌｃ３１と配管Ｌｗ３−１とを連結する配管Ｌｃ５１、及び、配管Ｌｃ３１と配管Ｌｗ３とを連結する配管Ｌｃ５２とが設置される点で、第５実施形態と異なる。なお、配管Ｌｃ５２は、配管Ｌｗ３−２に連結していても良い。配管Ｌｃ５１，Ｌｃ５２にはそれぞれ、バルブＶ５１，Ｖ５２が設置される。 In the exhaust heat recovery boiler 601 of the seventh embodiment, the fifth embodiment is provided in that the pipe Lc51 connecting the pipe Lc31 and the pipe Lw3-1 and the pipe Lc52 connecting the pipe Lc31 and the pipe Lw3 are installed. Different from the form. The pipe Lc52 may be connected to the pipe Lw3-2. Valves V51 and V52 are installed in the pipes Lc51 and Lc52, respectively.

第７実施形態では、第１実施形態〜第４実施形態のように水張ポンプは設置されていない。また、洗浄系統に洗浄液の温度を調整する手段は設置されない。 In the seventh embodiment, the water-filled pump is not installed as in the first to fourth embodiments. In addition, no means for adjusting the temperature of the cleaning liquid is installed in the cleaning system.

図７の排熱回収ボイラ６０１の配管内部を洗浄する方法を以下で説明する。
洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、薬注ポンプ５１及び、給水ポンプ１４ａ，１４ｂは停止されている。図５に示すようにバルブＶ３〜Ｖ７，Ｖ３１〜３４，Ｖ５２が閉鎖され、バルブＶ８，Ｖ５１が開放される。 A method of cleaning the inside of the pipe of the exhaust heat recovery boiler 601 of FIG. 7 will be described below.
At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, the chemical injection pump 51, and the water supply pumps 14a and 14b are stopped. As shown in FIG. 5, valves V3 to V7, V31 to 34, V52 are closed, and valves V8 and V51 are opened.

薬注ポンプ５１が起動し、貯留部５０内の洗浄液が配管Ｌｃ４を介して配管Ｌｃ３１に送給される。給水ポンプ１４ａが起動し、常温の洗浄液が配管Ｌｃ３１から配管Ｌｗ３−１を通り節炭器１３ａに送給される。節炭器１３ａに送給された洗浄液は、配管Ｌｗ４ａ，Ｌｗ５−１ａ，Ｌｗ５−２ａを介して蒸気ドラム１１ａ及び蒸発器１２ａに送給される。 The chemical injection pump 51 is activated, and the cleaning liquid in the storage unit 50 is supplied to the pipe Lc31 via the pipe Lc4. The water supply pump 14a is activated, and the cleaning liquid at room temperature is supplied from the pipe Lc31 to the economizer 13a through the pipe Lw3-1. The cleaning liquid supplied to the economizer 13a is supplied to the steam drum 11a and the evaporator 12a via the pipes Lw4a, Lw5-1a, and Lw5-2a.

計測部は、蒸気ドラム１１ａ内の洗浄液の水位を計測する。蒸気ドラム１１ａで洗浄液の水位が満水に到達すると、給水ポンプ１４ａ及び薬注ポンプ５１が停止され、バルブＶ８，Ｖ５１が閉鎖される。これにより、節炭器１３ａ、蒸気ドラム１１ａ及び蒸発器１２ａの洗浄が開始される。 The measuring unit measures the water level of the cleaning liquid in the steam drum 11a. When the water level of the cleaning liquid reaches full water on the steam drum 11a, the water supply pump 14a and the chemical injection pump 51 are stopped, and the valves V8 and V51 are closed. As a result, cleaning of the economizer 13a, the steam drum 11a and the evaporator 12a is started.

所定時間経過後、バルブＶ３１，Ｖ５２が開放され、給水ポンプ１４ｂが起動する。排熱回収部１０ａの洗浄に使用された洗浄液は、配管Ｌｃ３１，Ｌｃ５２，Ｌｗ３−２を介して節炭器１３ｂに送給される。その後、配管Ｌｗ４ｂ，Ｌｗ５−１ｂ，Ｌｗ５−２ｂを介して蒸気ドラム１１ｂ及び蒸発器１２ｂに送給される。計測部は蒸気ドラム１１ｂ内の水位を計測する。蒸気ドラム１１ｂが満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。 After a lapse of a predetermined time, the valves V31 and V52 are opened and the water supply pump 14b is started. The cleaning liquid used for cleaning the exhaust heat recovery unit 10a is supplied to the economizer 13b via the pipes Lc31, Lc52, and Lw3-2. After that, it is supplied to the steam drum 11b and the evaporator 12b via the pipes Lw4b, Lw5-1b, and Lw5-2b. The measuring unit measures the water level in the steam drum 11b. When the steam drum 11b does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage portion 50 is conveyed to the economizer 13b, the steam drum 11b, and the evaporator 12b.

蒸気ドラム１１ｂが満水に到達すると、給水ポンプ１４ｂ及び薬注ポンプ５１が停止され、バルブＶ８，Ｖ３１，Ｖ５２が閉鎖される。これにより、節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂが漬け置き洗浄される。 When the steam drum 11b reaches full water, the water supply pump 14b and the chemical injection pump 51 are stopped, and the valves V8, V31, and V52 are closed. As a result, the economizer 13b, the steam drum 11b, and the evaporator 12b are immersed and washed.

所定時間経過後、バルブＶ３２，Ｖ３３が開放され、節炭器循環ポンプ５が起動する。排熱回収部１０ｂの洗浄に使用された洗浄液は、Ｌｃ３２，Ｌｃ３１，Ｌｗ１を介して節炭器１３ｃに送給される。その後、配管Ｌｗ４ｃ，Ｌｗ５−１ｃ，Ｌｗ５−２ｃを介して蒸気ドラム１１ｃ及び蒸発器１２ｃに送給される。計測部は蒸気ドラム１１ｃ内の水位を計測する。蒸気ドラム１１ｃが満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｃ、蒸気ドラム１１ｃ及び蒸発器１２ｃに搬送される。 After a lapse of a predetermined time, the valves V32 and V33 are opened, and the economizer circulation pump 5 is started. The cleaning liquid used for cleaning the exhaust heat recovery unit 10b is supplied to the economizer 13c via Lc32, Lc31, and Lw1. After that, it is supplied to the steam drum 11c and the evaporator 12c via the pipes Lw4c, Lw5-1c, and Lw5-2c. The measuring unit measures the water level in the steam drum 11c. When the steam drum 11c does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage portion 50 is conveyed to the economizer 13c, the steam drum 11c, and the evaporator 12c.

蒸気ドラム１１ｃが満水に到達すると、節炭器循環ポンプ５及び薬注ポンプ５１が停止され、バルブＶ８，Ｖ３２，Ｖ３３が閉鎖される。これにより、節炭器１３ｃ、蒸気ドラム１１ｃ及び蒸発器１２ｃが漬け置き洗浄される。 When the steam drum 11c reaches full water, the economizer circulation pump 5 and the chemical injection pump 51 are stopped, and the valves V8, V32, and V33 are closed. As a result, the economizer 13c, the steam drum 11c and the evaporator 12c are immersed and washed.

洗浄の順番は上述に限られず、任意の順番で実施することができる。各排熱回収部１０ａ〜１０ｃの洗浄は１回でも良いし、複数回実施されても良い。また、所定回数の洗浄に使用された洗浄液は、配管Ｌｃ３１の途中位置に設けられるブローライン（不図示）から系外に排出される。洗浄液の排出後は、貯留部５０から新規の洗浄液が送給される。 The order of cleaning is not limited to the above, and can be performed in any order. The cleaning of each exhaust heat recovery unit 10a to 10c may be performed once or may be performed a plurality of times. Further, the cleaning liquid used for cleaning a predetermined number of times is discharged to the outside of the system from a blow line (not shown) provided at an intermediate position of the pipe Lc31. After the cleaning liquid is discharged, a new cleaning liquid is supplied from the storage unit 50.

本実施形態の洗浄方法では、洗浄系統にヒータ等の加熱器が設けられていないため、常温で洗浄が実施される。第５実施形態と比較して洗浄に要する洗浄液の容積を低減することが可能である。また、本実施形態では節炭器に給水を送給する給水ポンプ１４ａ，１４ｂ及び節炭器循環ポンプ５を利用して洗浄液の送給を行っている。すなわち、既存の給水系統のポンプを洗浄にも利用しているため、設備設置コスト及び運転コストを低減することが可能である。 In the cleaning method of the present embodiment, since the cleaning system is not provided with a heater such as a heater, cleaning is performed at room temperature. It is possible to reduce the volume of the cleaning liquid required for cleaning as compared with the fifth embodiment. Further, in the present embodiment, the cleaning liquid is supplied by using the water supply pumps 14a and 14b for supplying water to the economizer and the economizer circulation pump 5. That is, since the pump of the existing water supply system is also used for cleaning, it is possible to reduce the equipment installation cost and the operation cost.

本実施形態の変形例では、第３実施形態で説明したように、竪型の排熱回収ボイラとして、鉛直方向に隣り合う蒸発ボイラ及び蒸発器同士を直列的に連結する配管が設置されていても良い。この変形例では、洗浄後に上述の配管を介して洗浄液が重力を利用して移送される。このため、洗浄時間を短縮することが可能である。 In the modified example of the present embodiment, as described in the third embodiment, as the vertical exhaust heat recovery boiler, the evaporation boilers adjacent to each other in the vertical direction and the piping for connecting the evaporators in series are installed. Is also good. In this modification, after cleaning, the cleaning liquid is transferred by gravity through the above-mentioned piping. Therefore, it is possible to shorten the cleaning time.

本実施形態の別の変形例では、第４実施形態で説明したように、蒸発ボイラ及び蒸発器同士を直列的に連結する配管と、移送ポンプとが設置される。この変形例では、洗浄液の移送にポンプが使用されるため、洗浄時間を短縮することが可能である。 In another modification of the present embodiment, as described in the fourth embodiment, a pipe for connecting the evaporation boiler and the evaporator in series and a transfer pump are installed. In this modification, a pump is used to transfer the cleaning liquid, so that the cleaning time can be shortened.

［第８実施形態］
図８は、第８実施形態に係る排熱回収ボイラの配管系統図である。図８において、図６、図７と同じ構成には同じ符号を付す。 [8th Embodiment]
FIG. 8 is a piping system diagram of the exhaust heat recovery boiler according to the eighth embodiment. In FIG. 8, the same components as those in FIGS. 6 and 7 are designated by the same reference numerals.

第８実施形態の排熱回収ボイラ７０１は、第７実施形態と同様に配管Ｌｃ５１，Ｌｃ５２が設置される点で第６実施形態と異なる。 The exhaust heat recovery boiler 701 of the eighth embodiment is different from the sixth embodiment in that the pipes Lc51 and Lc52 are installed as in the seventh embodiment.

第８実施形態では、第１実施形態〜第４実施形態のように水張ポンプは設置されていない。また、洗浄系統に洗浄液の温度を調整する手段は設置されない。 In the eighth embodiment, the water-filled pump is not installed as in the first to fourth embodiments. In addition, no means for adjusting the temperature of the cleaning liquid is installed in the cleaning system.

図８の排熱回収ボイラ７０１の配管内部を洗浄する方法を以下で説明する。
洗浄開始時に、復水ポンプ４、節炭器循環ポンプ５、薬注ポンプ５１及び、給水ポンプ１４ａ，１４ｂは停止されている。図８に示すようにバルブＶ３〜Ｖ７，Ｖ３２〜３４，Ｖ５２が閉鎖され、バルブＶ８，Ｖ３１，Ｖ５１が開放される。 A method of cleaning the inside of the pipe of the exhaust heat recovery boiler 701 of FIG. 8 will be described below.
At the start of cleaning, the condenser pump 4, the economizer circulation pump 5, the chemical injection pump 51, and the water supply pumps 14a and 14b are stopped. As shown in FIG. 8, valves V3 to V7, V32 to 34, and V52 are closed, and valves V8, V31, and V51 are opened.

薬注ポンプ５１が起動し、貯留部５０内の洗浄液が配管Ｌｃ４を介して配管Ｌｃ３１に送給される。給水ポンプ１４ａが起動し、常温の洗浄液が配管Ｌｃ３１から配管Ｌｃ５１，Ｌｗ３−１を通り節炭器１３ａに送給される。節炭器１３ａに送給された洗浄液は、配管Ｌｗ４ａ，Ｌｗ５−１ａ，Ｌｗ５−２ａ，Ｌｃ４１を介して蒸気ドラム１１ａ及び蒸発器１２ａに送給される。 The chemical injection pump 51 is activated, and the cleaning liquid in the storage unit 50 is supplied to the pipe Lc31 via the pipe Lc4. The water supply pump 14a is activated, and the cleaning liquid at room temperature is supplied from the pipe Lc31 to the economizer 13a through the pipes Lc51 and Lw3-1. The cleaning liquid supplied to the economizer 13a is supplied to the steam drum 11a and the evaporator 12a via the pipes Lw4a, Lw5-1a, Lw5-2a, and Lc41.

計測部は、蒸気ドラム１１ａ内の洗浄液の水位を計測する。蒸気ドラム１１ａで洗浄液の水位が満水に到達すると、バルブＶ８が閉鎖され、薬注ポンプ５１が停止される。給水ポンプ１４ａが作動した状態で、節炭器１３ａ、蒸気ドラム１１ａ及び蒸発器１２ａの洗浄が開始される。 The measuring unit measures the water level of the cleaning liquid in the steam drum 11a. When the water level of the cleaning liquid reaches full water on the steam drum 11a, the valve V8 is closed and the chemical injection pump 51 is stopped. With the water supply pump 14a operating, cleaning of the economizer 13a, the steam drum 11a, and the evaporator 12a is started.

所定時間経過後、バルブＶ５１が閉鎖され、バルブＶ５２が開放される。給水ポンプ１４ａが停止し、給水ポンプ１４ｂが起動する。排熱回収部１０ａの洗浄に使用された洗浄液は、配管Ｌｃ３１，Ｌｃ５２，Ｌｗ３−２を介して節炭器１３ｂに送給される。その後、配管Ｌｗ４ｂ，Ｌｗ５−１ｂ，Ｌｗ５−２ｂ，Ｌｃ４２を介して蒸気ドラム１１ｂ及び蒸発器１２ｂに送給される。計測部は蒸気ドラム１１ｂ内の水位を計測する。蒸気ドラム１１ｂが満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂに搬送される。 After a lapse of a predetermined time, the valve V51 is closed and the valve V52 is opened. The water supply pump 14a is stopped and the water supply pump 14b is started. The cleaning liquid used for cleaning the exhaust heat recovery unit 10a is supplied to the economizer 13b via the pipes Lc31, Lc52, and Lw3-2. After that, it is supplied to the steam drum 11b and the evaporator 12b via the pipes Lw4b, Lw5-1b, Lw5-2b, and Lc42. The measuring unit measures the water level in the steam drum 11b. When the steam drum 11b does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage portion 50 is conveyed to the economizer 13b, the steam drum 11b, and the evaporator 12b.

蒸気ドラム１１ｂが満水に到達すると、バルブＶ８、Ｖ３１が閉鎖され、薬注ポンプ５１が停止される。給水ポンプ１４ｂが作動した状態で、節炭器１３ｂ、蒸気ドラム１１ｂ及び蒸発器１２ｂの洗浄が開始される。 When the steam drum 11b reaches full water, the valves V8 and V31 are closed and the chemical injection pump 51 is stopped. With the water supply pump 14b operating, cleaning of the economizer 13b, the steam drum 11b and the evaporator 12b is started.

所定時間経過後、バルブＶ５２が閉鎖され、バルブＶ３２，Ｖ３４が開放され、節炭器循環ポンプ５が起動する。排熱回収部１０ｂの洗浄に使用された洗浄液は、Ｌｃ３２，Ｌｃ３１，Ｌｗ２を介して節炭器１３ｃに送給される。その後、配管Ｌｗ４ｃ，Ｌｗ５−１ｃ，Ｌｗ５−２ｃ，Ｌｃ４３を介して蒸気ドラム１１ｃ及び蒸発器１２ｃに送給される。計測部は蒸気ドラム１１ｃ内の水位を計測する。蒸気ドラム１１ｃが満水に到達しない場合は、薬注ポンプ５１が起動し、バルブＶ８が開放され、貯留部５０内の洗浄液が節炭器１３ｃ、蒸気ドラム１１ｃ及び蒸発器１２ｃに搬送される。 After a lapse of a predetermined time, the valves V52 are closed, the valves V32 and V34 are opened, and the economizer circulation pump 5 is started. The cleaning liquid used for cleaning the exhaust heat recovery unit 10b is supplied to the economizer 13c via Lc32, Lc31, and Lw2. After that, it is supplied to the steam drum 11c and the evaporator 12c via the pipes Lw4c, Lw5-1c, Lw5-2c, and Lc43. The measuring unit measures the water level in the steam drum 11c. When the steam drum 11c does not reach full water, the chemical injection pump 51 is started, the valve V8 is opened, and the cleaning liquid in the storage portion 50 is conveyed to the economizer 13c, the steam drum 11c, and the evaporator 12c.

蒸気ドラム１１ｃが満水に到達すると、バルブＶ８、Ｖ３３が閉鎖され、薬注ポンプ５１が停止される。節炭器循環ポンプ５が起動した状態で、節炭器１３ｃ、蒸気ドラム１１ｃ及び蒸発器１２ｃの洗浄が開始される。 When the steam drum 11c reaches full water, the valves V8 and V33 are closed and the chemical injection pump 51 is stopped. With the economizer circulation pump 5 activated, cleaning of the economizer 13c, the steam drum 11c, and the evaporator 12c is started.

洗浄の順番は上述に限られず、任意の順番で実施することができる。各排熱回収部１０ａ〜１０ｃの洗浄は１回でも良いし、複数回実施されても良い。また、所定回数の洗浄に使用された洗浄液は、配管Ｌｃ３１の途中位置に設けられるブローライン（不図示）から系外に排出される。洗浄液の排出後は、貯留部５０から新規の洗浄液が送給される。 The order of cleaning is not limited to the above, and can be performed in any order. The cleaning of each exhaust heat recovery unit 10a to 10c may be performed once or may be performed a plurality of times. Further, the cleaning liquid used for cleaning a predetermined number of times is discharged to the outside of the system from a blow line (not shown) provided at an intermediate position of the pipe Lc31. After the cleaning liquid is discharged, a new cleaning liquid is supplied from the storage unit 50.

本実施形態の洗浄方法では、洗浄系統にヒータ等の加熱器が設けられていないため、常温で洗浄が実施される。第７実施形態と比較して洗浄に要する洗浄液の容積を低減することが可能である。また、本実施形態では既存の給水系統のポンプを洗浄にも利用しているため、設備設置コスト及び運転コストを低減することが可能である。 In the cleaning method of the present embodiment, since the cleaning system is not provided with a heater such as a heater, cleaning is performed at room temperature. It is possible to reduce the volume of the cleaning liquid required for cleaning as compared with the seventh embodiment. Further, in the present embodiment, since the pump of the existing water supply system is also used for cleaning, it is possible to reduce the equipment installation cost and the operation cost.

本実施形態の変形例では、第３実施形態で説明したように、竪型の排熱回収ボイラとして、鉛直方向に隣り合う蒸発ボイラ及び蒸発器同士を直列的に連結する配管が設置されていても良い。本実施形態の別の変形例では、第４実施形態で説明したように、蒸発ボイラ及び蒸発器同士を直列的に連結する配管と、移送ポンプとが設置されても良い。 In the modified example of the present embodiment, as described in the third embodiment, as the vertical exhaust heat recovery boiler, the evaporation boilers adjacent to each other in the vertical direction and the piping for connecting the evaporators in series are installed. Is also good. In another modification of the present embodiment, as described in the fourth embodiment, a pipe for connecting the evaporation boiler and the evaporator in series and a transfer pump may be installed.

１，１０１，２０１，３０１，４０１，５０１，６０１，７０１ 排熱回収ボイラ
２ 復水器
３ 蒸気タービン
４ 復水ポンプ
５ 節炭器循環ポンプ
１０ａ〜１０ｃ 排熱回収部
１１ａ〜１１ｃ 蒸気ドラム
１２ａ〜１２ｃ 蒸発器
１３ａ〜１３ｃ 節炭器
１４ａ，１４ｂ 給水ポンプ
２０ａ〜２０ｃ 過熱器
２１ 再熱器
３０ 水張ポンプ
５０ 貯留部
５１ 薬注ポンプ
６０ ドラムレベル低減管
６１ ドラムブロー管
７１ａ〜７１ｄ 移送ポンプ 1,101,201,301,401,501,601,701 Exhaust heat recovery boiler 2 Condenser 3 Steam turbine 4 Condenser pump 5 Economizer Circulation pump 10a-10c Exhaust heat recovery unit 11a to 11c Steam drum 12a to 12c Evaporator 13a ~ 13c Economizer 14a, 14b Water supply pump 20a ~ 20c Superheater 21 Condenser 30 Water filling pump 50 Reservoir 51 Chemical injection pump 60 Drum level reduction pipe 61 Drum blow pipe 71a ~ 71d Transfer pump

Claims (20)

蒸発器と蒸気ドラムと節炭器とを有する排熱回収部を備える排熱回収ボイラであって、
前記排熱回収部内を洗浄するための洗浄部を備え、
前記洗浄部は、
中性の除錆剤を含む常温の洗浄液を貯蔵する貯留部と、前記洗浄液を前記排熱回収部に導くとともに前記排熱回収部から排出させる洗浄配管と、前記洗浄配管に前記洗浄液を流通させるポンプとを備える洗浄液送給部と、
を有する排熱回収ボイラ。 An exhaust heat recovery boiler having an exhaust heat recovery unit having an evaporator, a steam drum, and an economizer.
A cleaning unit for cleaning the inside of the exhaust heat recovery unit is provided.
The cleaning part
A storage unit that stores a cleaning liquid at room temperature containing a neutral rust remover, a cleaning pipe that guides the cleaning liquid to the exhaust heat recovery unit and discharges the cleaning liquid from the exhaust heat recovery unit, and a cleaning pipe that distributes the cleaning liquid to the cleaning pipe. a cleaning liquid feed unit and a pump,
Exhaust heat recovery boiler having. 前記排熱回収部内の常温の前記洗浄液の水位を前記洗浄配管の途中の所定の水位に調整する機構を有する請求項１に記載の排熱回収ボイラ。The exhaust heat recovery boiler according to claim 1, further comprising a mechanism for adjusting the water level of the cleaning liquid at room temperature in the exhaust heat recovery unit to a predetermined water level in the middle of the cleaning pipe. 前記蒸気ドラム内の前記洗浄液の水位を計測する計測部と、A measuring unit that measures the water level of the cleaning liquid in the steam drum, and
前記洗浄配管の途中位置に設けられ、前記計測部の計測値に基づいて、前記蒸気ドラム内で常温の前記洗浄液の所定の水位に調整するバルブと、A valve provided in the middle of the cleaning pipe and adjusting to a predetermined water level of the cleaning liquid at room temperature in the steam drum based on the measured value of the measuring unit.
をさらに有する請求項１または請求項２に記載の排熱回収ボイラ。The exhaust heat recovery boiler according to claim 1 or 2, further comprising. 前記洗浄配管が前記洗浄液を前記節炭器に導く請求項１乃至請求項３のいずれかに記載の排熱回収ボイラ。 The exhaust heat recovery boiler according to any one of claims 1 to 3, wherein the cleaning pipe guides the cleaning liquid to the economizer. 圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記洗浄液の最上流側の前記排熱回収部に前記洗浄液送給部が連結し、連絡管が前記複数の排熱回収部を直列に連結し、前記洗浄液の最下流側の前記排熱回収部に前記洗浄配管が連結し、
前記ポンプが、一回の洗浄で全ての前記排熱回収部に前記洗浄液を送給する請求項１乃至請求項４のいずれかに記載の排熱回収ボイラ。 A plurality of exhaust heat recovery units that generate steam having different pressures are provided, the cleaning liquid feeding unit is connected to the exhaust heat recovery unit on the most upstream side of the cleaning liquid, and a connecting pipe connects the plurality of exhaust heat recovery units. Connected in series, the cleaning pipe is connected to the exhaust heat recovery unit on the most downstream side of the cleaning liquid.
It said pump is a single heat recovery boiler according to any one of the cleaning solution feeding a Kyusuru claims 1 to 4 for all the exhaust heat recovery unit with washing. 圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部の各々に前記洗浄配管が並列に連結し、
前記ポンプが、一回の洗浄で全ての前記排熱回収部に前記洗浄液を送給する請求項１乃至請求項４のいずれかに記載の排熱回収ボイラ。 A plurality of the exhaust heat recovery units for generating steam having different pressures are provided, and the cleaning pipe is connected in parallel to each of the plurality of exhaust heat recovery units.
It said pump is a single heat recovery boiler according to any one of the cleaning solution feeding a Kyusuru claims 1 to 4 for all the exhaust heat recovery unit with washing. 圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部の各々に前記洗浄配管が連結し、
前記ポンプが、一回の洗浄で、前記貯留部から前記洗浄液を一つの前記排熱回収部に送給する請求項１乃至請求項４のいずれかに記載の排熱回収ボイラ。 A plurality of the exhaust heat recovery units for generating steam having different pressures are provided, and the cleaning pipe is connected to each of the plurality of exhaust heat recovery units.
The pump is, in a single washing, the exhaust heat recovery boiler according to any one of claims 1 to 4 feeds to the exhaust heat recovery unit of one said cleaning fluid from said reservoir. 前記複数の排熱回収部が鉛直方向に配列され、
第１の連絡管が鉛直方向に隣り合う前記蒸発器同士を直列的に連結し、第２の連絡管が鉛直方向に隣り合う前記蒸気ドラム同士を直列的に連結し、
洗浄が行われた前記蒸発器内の前記洗浄液が、重力により、前記第１の連絡管を介して前記洗浄が行われた蒸発器より下側に位置する前記蒸発器に送給され、
洗浄が行われた前記蒸気ドラム内の前記洗浄液が、重力により、前記第２の連絡管を介して前記洗浄が行われた蒸気ドラムより下側に位置する前記蒸気ドラムに送給される請求項７に記載の排熱回収ボイラ。 The plurality of exhaust heat recovery units are arranged in the vertical direction.
The first connecting pipe connects the evaporators adjacent to each other in the vertical direction in series, and the second connecting pipe connects the steam drums adjacent to each other in the vertical direction in series.
The cleaning liquid in the evaporated evaporator that has been cleaned is fed by gravity to the evaporator located below the evaporator that has been cleaned via the first connecting pipe.
The claim that the cleaning liquid in the steam drum that has been cleaned is fed by gravity to the steam drum located below the steam drum that has been cleaned via the second connecting pipe. The exhaust heat recovery boiler according to 7 . 第１の連絡管が前記複数の排熱回収部の前記蒸発器を直列に連結し、第２の連絡管が前記複数の排熱回収部の前記蒸気ドラムを直列に連結し、前記第１の連絡管及び前記第２の連絡管の各々に移送ポンプが設置され、
前記移送ポンプが、洗浄が行われた前記蒸発器内の前記洗浄液を、前記第１の連絡管を介して別の前記蒸発器に送給するとともに、洗浄が行われた前記蒸気ドラム内の前記洗浄液を、前記第２の連絡管を介して別の前記蒸気ドラムに送給する請求項７に記載の排熱回収ボイラ。 The first connecting pipe connects the evaporators of the plurality of exhaust heat recovery units in series, and the second connecting pipe connects the steam drums of the plurality of exhaust heat recovery units in series. Transfer pumps are installed in each of the connecting pipe and the second connecting pipe.
The transfer pump feeds the cleaning liquid in the cleaned evaporator to another evaporator via the first connecting pipe, and the cleaning liquid in the steam drum that has been washed. The exhaust heat recovery boiler according to claim 7 , wherein the cleaning liquid is fed to another steam drum via the second connecting pipe. 前記排熱回収部が前記節炭器にボイラ給水を供給するための給水ポンプを備え、前記給水ポンプが前記洗浄液送給部の前記ポンプである請求項１乃至請求項９のいずれかに記載の排熱回収ボイラ。 The method according to any one of claims 1 to 9 , wherein the exhaust heat recovery unit includes a water supply pump for supplying boiler water to the economizer, and the water supply pump is the pump of the cleaning liquid supply unit. Exhaust heat recovery boiler. 蒸発器と蒸気ドラムと節炭器とを有する排熱回収部を備える排熱回収ボイラにおいて、前記排熱回収部内を洗浄するための洗浄方法であって、
中性の除錆剤を含む常温の洗浄液が、前記排熱回収部に供給され、
前記排熱回収部への前記洗浄液の送給が停止されて、前記排熱回収部の内部が常温の前記洗浄液に所定時間浸漬され、
前記所定時間が経過した後に、洗浄が行われた前記排熱回収部から前記洗浄液が排出される洗浄方法。 A cleaning method for cleaning the inside of the exhaust heat recovery unit in an exhaust heat recovery boiler including an exhaust heat recovery unit having an evaporator, a steam drum, and an economizer.
Room temperature of the cleaning liquid containing the rust removal agent neutral is supplied before Sharing, ABS heat recovery unit,
And feeding the washing liquid to the previous Sharing, ABS heat recovery unit is stopped, the inside of the exhaust heat recovery unit is immersed a predetermined time in said cleaning solution at room temperature,
A cleaning method in which the cleaning liquid is discharged from the exhaust heat recovery unit that has been cleaned after the predetermined time has elapsed. 蒸発器と蒸気ドラムと節炭器とを有する排熱回収部を備える排熱回収ボイラにおいて、前記排熱回収部内を洗浄するための洗浄方法であって、
中性の除錆剤を含む常温の洗浄液が、前記排熱回収部に供給され、
前記排熱回収部内で前記洗浄液を循環させながら、前記排熱回収部の内部が常温の前記洗浄液に所定時間浸漬され、
前記所定時間が経過した後に、洗浄が行われた前記排熱回収部から前記洗浄液が排出される洗浄方法。 A cleaning method for cleaning the inside of the exhaust heat recovery unit in an exhaust heat recovery boiler including an exhaust heat recovery unit having an evaporator, a steam drum, and an economizer.
Room temperature of the cleaning liquid containing the rust removal agent neutral is supplied before Sharing, ABS heat recovery unit,
While circulating the cleaning liquid in front Sharing, ABS heat recovery portion, the inside of the exhaust heat recovery unit is immersed a predetermined time in said cleaning solution at room temperature,
A cleaning method in which the cleaning liquid is discharged from the exhaust heat recovery unit that has been cleaned after the predetermined time has elapsed. 前記排熱回収部を流通する水の処理方法をリン酸塩水処理からＨｉｇｈ−ＡＶＴ水処理に転換する際に、前記排熱回収部内を前記洗浄液で洗浄する請求項１１または請求項１２に記載の洗浄方法。 The 11th or 12th claim, wherein when the method for treating the water flowing through the waste heat recovery unit is changed from the phosphate water treatment to the High-AVT water treatment, the inside of the waste heat recovery unit is washed with the cleaning liquid. Cleaning method. 前記節炭器に前記洗浄液が供給され、前記節炭器の内部が前記洗浄液に浸漬される請求項１１乃至請求項１３のいずれかに記載の洗浄方法。 Wherein the cleaning liquid is supplied to the economizer, the method of cleaning according to any one of claims 11 to 13 inside the economizer is immersed in the cleaning solution. 圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部が前記洗浄液の流れに対し直列に連結される排熱回収ボイラにおいて、一回の洗浄で、前記洗浄液が、前記複数の排熱回収部に送給される請求項１１乃至請求項１４のいずれかに記載の洗浄方法。 In an exhaust heat recovery boiler having a plurality of exhaust heat recovery units that generate steam having different pressures and in which the plurality of exhaust heat recovery units are connected in series with respect to the flow of the cleaning liquid, the cleaning liquid is subjected to a single cleaning. but cleaning method according to any one of claims 11 to 14 is fed to the plurality of exhaust heat recovery unit. 圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部が前記洗浄液の流れに対し並列に連結される排熱回収ボイラにおいて、
一回の洗浄で、前記洗浄液が前記複数の排熱回収部に送給される請求項１１乃至請求項１４のいずれかに記載の洗浄方法。 In an exhaust heat recovery boiler having a plurality of exhaust heat recovery units that generate steam having different pressures, and the plurality of exhaust heat recovery units are connected in parallel with the flow of the cleaning liquid.
In a single washing, cleaning method according to any one of claims 11 to 14 wherein the cleaning liquid is fed into the plurality of exhaust heat recovery unit. 圧力の異なる蒸気を発生させる複数の前記排熱回収部を備え、前記複数の排熱回収部が前記洗浄液の流れに対し並列に連結される排熱回収ボイラにおいて、
一回の洗浄で、前記洗浄液が、一つの前記排熱回収部に送給される請求項１１乃至請求項１４のいずれかに記載の洗浄方法。 In an exhaust heat recovery boiler having a plurality of exhaust heat recovery units that generate steam having different pressures, and the plurality of exhaust heat recovery units are connected in parallel with the flow of the cleaning liquid.
In a single washing, the cleaning liquid, cleaning method according to any one of claims 11 to 14 is fed to one of said exhaust heat recovery unit. 前記複数の排熱回収部が鉛直方向に配列された排熱回収ボイラにおいて、
洗浄が行われた前記蒸発器内の前記洗浄液が、重力により、該洗浄が行われた蒸発器より下側で隣り合う前記蒸発器に送給され、
洗浄が行われた前記蒸気ドラム内の前記洗浄液が、重力により、該洗浄が行われた蒸気ドラムより下側で隣り合う前記蒸気ドラムに送給される請求項１７に記載の洗浄方法。 In the exhaust heat recovery boiler in which the plurality of exhaust heat recovery units are arranged in the vertical direction,
The cleaning liquid in the cleaned evaporator is fed by gravity to the adjacent evaporator below the cleaned evaporator.
The cleaning method according to claim 17 , wherein the cleaning liquid in the steam drum that has been cleaned is fed by gravity to the adjacent steam drum below the steam drum that has been cleaned. 前記複数の排熱回収部の前記蒸発器が直列に連結され、前記複数の排熱回収部の前記蒸気ドラムが直列に連結され、前記蒸発器の間及び前記蒸発ボイラの間の各々に移送ポンプが設置された排熱回収ボイラにおいて、
洗浄が行われた前記蒸発器内の前記洗浄液が、前記移送ポンプにより別の前記蒸発器に送給され、
洗浄が行われた前記蒸気ドラム内の前記洗浄液が、前記移送ポンプにより別の前記蒸気ドラムに送給される請求項１７に記載の洗浄方法。 The evaporators of the plurality of exhaust heat recovery units are connected in series, the steam drums of the plurality of exhaust heat recovery units are connected in series, and transfer pumps are connected between the evaporators and between the evaporation boilers. In the exhaust heat recovery boiler installed
The cleaning liquid in the evaporator that has been washed is fed to another evaporator by the transfer pump.
The cleaning method according to claim 17 , wherein the cleaning liquid in the steam drum that has been cleaned is fed to another steam drum by the transfer pump. 前記排熱回収部が前記節炭器にボイラ給水を供給するための給水ポンプを備える排熱回収ボイラにおいて、前記給水ポンプが前記排熱回収部に前記洗浄液を供給する請求項１１乃至請求項１９のいずれかに記載の洗浄方法。 Wherein the exhaust heat recovery boiler exhaust heat recovery unit comprises a feed pump for supplying boiler feed water to the economizer, the water supply pump according to claim supplying the cleaning liquid to the exhaust heat recovery unit 11 through claim 19 The cleaning method according to any one of.
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