JPH11141804A - Method of chemically cleaning boiler - Google Patents
Method of chemically cleaning boilerInfo
- Publication number
- JPH11141804A JPH11141804A JP30430197A JP30430197A JPH11141804A JP H11141804 A JPH11141804 A JP H11141804A JP 30430197 A JP30430197 A JP 30430197A JP 30430197 A JP30430197 A JP 30430197A JP H11141804 A JPH11141804 A JP H11141804A
- Authority
- JP
- Japan
- Prior art keywords
- cleaning
- washing
- water
- boiler
- extrusion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はボイラの化学洗浄方
法に関し、さらに詳細にはボイラに化学洗浄液を導入し
て加熱状態で洗浄した後、洗浄水を導入して押出洗浄を
行う化学洗浄方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical cleaning method for a boiler, and more particularly, to a chemical cleaning method in which a chemical cleaning liquid is introduced into a boiler to clean the boiler in a heated state, and then cleaning water is introduced to perform extrusion cleaning. Things.
【０００２】[0002]
【従来の技術】貫流ボイラ、変圧貫流ボイラ等の水管式
のボイラでは、ボイラに化学洗浄液として酸液を導入し
加熱状態で循環して洗浄工程を行った後、洗浄水として
純水を導入して押出水洗工程を行っている。洗浄工程で
は８０〜９０℃に加熱して洗浄液を循環することにより
スケールを除去しており、押出水洗工程では洗浄水を導
入し、循環することなく洗浄排液を押出すことにより、
洗浄排液の押出と水洗を行うようにしている。2. Description of the Related Art In a water tube type boiler such as a once-through boiler and a variable-pressure once-through boiler, an acid solution is introduced into the boiler as a chemical cleaning solution, circulated in a heated state to perform a cleaning process, and then pure water is introduced as cleaning water. To carry out the extrusion water washing process. In the washing step, the scale is removed by heating to 80 to 90 ° C. and circulating the washing liquid, and in the extrusion water washing step, washing water is introduced, and the washing drainage is extruded without circulation.
Extrusion of washing wastewater and washing with water are performed.
【０００３】図３は従来の洗浄方法を示すフロー図であ
り、１はボイラ、２はポンプ、３は排液貯槽である。化
学洗浄方法は、給液路４からポンプ２により洗浄液をボ
イラ１に導入して取出路５から取出し、弁Ｖ1を開くこ
とにより循環路６を通して循環させて洗浄を行う。洗浄
工程終了後は弁Ｖ1を閉じ、給水路７から洗浄水をボイ
ラ１に供給し、排液路８から洗浄排液を排液貯槽３に流
入させて押出水洗工程を行う。排液貯槽３内の排液は排
出路９から排液処理装置（図示せず）に送られる。FIG. 3 is a flowchart showing a conventional cleaning method, wherein 1 is a boiler, 2 is a pump, and 3 is a drainage storage tank. In the chemical cleaning method, the cleaning liquid is introduced into the boiler 1 from the liquid supply path 4 by the pump 2, taken out from the discharge path 5, and circulated through the circulation path 6 by opening the valve V 1 to perform cleaning. After the washing step ends closing valve V 1, and supplies the washing water to the boiler 1 from the water supply passage 7, carries out the extrusion washing step is allowed to flow into the wash effluent to the draining tank 3 from drains 8. The drainage in the drainage storage tank 3 is sent from a drainage path 9 to a drainage treatment device (not shown).
【０００４】押出水洗工程の目的は、スケールを溶解し
た洗浄排液を系外に排出（押出）するとともに、管壁に
付着した洗浄液を洗い流し、次工程として例えば防錆処
理工程を行うための準備を整えることにある。この場
合、先に洗浄液を排出した後、洗浄水を導入して水洗す
ると、空気の導入により腐食が発生するので、空気を導
入することなく洗浄水を導入することにより洗浄液を押
出し、引き続いて水洗することが行われている。[0004] The purpose of the extrusion water washing step is to discharge (extrude) the washing waste liquid in which the scale has been dissolved out of the system, wash away the washing liquid adhering to the pipe wall, and prepare for the next step, for example, the rust prevention treatment step Is to arrange. In this case, if the cleaning liquid is first discharged, and then the cleaning water is introduced and washed with water, corrosion occurs due to the introduction of air.Therefore, the cleaning liquid is extruded by introducing the cleaning water without introducing air, and then the water is washed. That is being done.
【０００５】従来の押出水洗工程は単に洗浄水の導入に
よる洗浄排液の押出、水洗の操作を行っていたため、洗
浄水は低温（常温）の状態でボイラに入り、管壁から熱
を受けるが、比較的低温の状態で水洗が行われ、このた
め溶解したスケール成分の溶解度が低下して水洗に長時
間を要し、これにより大量の洗浄水（純水）が必要にな
るとともに、大量の洗浄排液が発生していた。[0005] In the conventional extrusion water washing process, the washing wastewater is simply extruded by introducing the washing water and the washing operation is performed, so that the washing water enters the boiler at a low temperature (normal temperature) and receives heat from the pipe wall. However, the water is washed at a relatively low temperature, so that the solubility of the dissolved scale component is reduced, so that it takes a long time to wash the water, which requires a large amount of washing water (pure water) and a large amount of water. Wash drainage occurred.
【０００６】一方、洗浄排液は約９０℃の高温であり、
これを排液貯槽にそのまま流入させると、槽内の樹脂
（ＰＶＣ等）配管や槽壁のエポキシ樹脂塗装またはゴム
ライニングが損傷するため、予め大量の冷却用水を槽内
に導入しておき、ここに排液を導入して冷却、稀釈する
必要があり、大量の冷却用水と大容量の貯槽が必要であ
った。[0006] On the other hand, the washing waste liquid has a high temperature of about 90 ° C,
If this is allowed to flow into the drainage storage tank as it is, the resin (PVC etc.) piping in the tank and the epoxy resin coating or rubber lining on the tank wall will be damaged, so a large amount of cooling water must be introduced into the tank in advance. The wastewater had to be introduced and cooled and diluted, requiring a large amount of cooling water and a large storage tank.
【０００７】これを避けるためにＦＤＦ（Forced Draft
Fan）によりボイラの火側に空気を送って冷却すると洗
浄時間が長くなるほか、ＦＤＦ稼動のためにはボイラ定
期点検用の足場の撤去等が必要になり、定期点検工程を
短くする必要があるなどの不都合が生じる。[0007] To avoid this, FDF (Forced Draft)
Fan) sends air to the boiler's fire side to cool it, which increases the cleaning time. In addition, it is necessary to remove scaffolds for boiler periodic inspections in order to operate the FDF, and it is necessary to shorten the periodic inspection process. Inconveniences such as occur.
【０００８】さらに押出水洗工程に続く防錆処理工程で
は、防錆処理液を加熱する必要があり、このためにさら
に大量の蒸気注入を行う必要があり、熱効率的に不利で
あるという問題点があった。Further, in the rust preventive treatment step following the extrusion water washing step, it is necessary to heat the rust preventive treatment liquid, and thus it is necessary to inject a larger amount of steam, which is disadvantageous in terms of thermal efficiency. there were.
【０００９】[0009]
【発明が解決しようとする課題】本発明の課題は、洗浄
排液から熱を回収して洗浄水の温度を高くし、これによ
り押出水洗効率を高めて押出水洗工程を短縮するととも
に、次工程の加熱に要する熱量を少なくし、かつ洗浄排
液の温度を低くすることにより冷却水の量を少なくする
とともに排液貯槽の容量を小さくすることができ、ＦＤ
Ｆによる冷却も不要となり、これにより洗浄時間を短縮
して効率化することができる化学洗浄方法を得ることで
ある。SUMMARY OF THE INVENTION An object of the present invention is to recover the heat from the washing effluent to raise the temperature of the washing water, thereby increasing the efficiency of the extrusion water washing and shortening the extrusion water washing step, as well as shortening the next step. By reducing the amount of heat required for heating the chiller and lowering the temperature of the washing drainage, the amount of cooling water can be reduced and the capacity of the drainage storage tank can be reduced.
An object of the present invention is to provide a chemical cleaning method that does not require cooling by F, thereby shortening the cleaning time and improving efficiency.
【００１０】[0010]
【課題を解決するための手段】本発明は、ボイラに化学
洗浄液を導入し、加熱した状態で循環して洗浄する洗浄
工程と、ボイラに洗浄水を導入し、洗浄排液を押出すと
ともに水洗する押出水洗工程とを含み、押出水洗工程で
はボイラから排出する洗浄排液と導入する洗浄水とを熱
交換器に導入して熱交換し、洗浄排液を冷却して排出す
るとともに洗浄水を加熱し、加熱状態の洗浄水で押出水
洗を行うことを特徴とするボイラの化学洗浄方法であ
る。According to the present invention, there is provided a cleaning step of introducing a chemical cleaning liquid into a boiler and circulating and cleaning it in a heated state, introducing cleaning water into the boiler, extruding a cleaning drainage and washing with water. In the extrusion water washing step, the washing wastewater discharged from the boiler and the washing water to be introduced are introduced into a heat exchanger to exchange heat, and the washing wastewater is cooled and discharged, and the washing water is discharged. A chemical cleaning method for a boiler, comprising heating and performing extrusion water cleaning with cleaning water in a heated state.
【００１１】本発明で洗浄の対象となるボイラは蒸気発
生装置として用いられるものであり、特に制限はない
が、火力発電所等で用いられている貫流ボイラ、変圧貫
流ボイラなどの水管式のボイラが、洗浄対象として適し
ており、特に加熱状態で化学洗浄を行うボイラが対象と
して好適である。The boiler to be cleaned in the present invention is used as a steam generator, and is not particularly limited, but a water tube type boiler such as a once-through boiler or a variable-pressure once-through boiler used in a thermal power plant or the like. However, it is suitable as a cleaning target, and in particular, a boiler that performs chemical cleaning in a heated state is suitable as a target.
【００１２】本発明で使用する化学洗浄液は、１〜１０
重量％の塩酸、硫酸等の鉱酸、クエン酸、リンゴ酸等の
有機酸水溶液からなる酸洗浄液が一般的であるが、キレ
ート剤その他の加熱状態で洗浄を行う洗浄液も含まれ
る。これらの洗浄液には主剤としての酸等のほかに界面
活性剤、腐食抑制剤等の助剤が添加される。The chemical cleaning solution used in the present invention is 1 to 10
An acid washing solution comprising an aqueous solution of an organic acid such as hydrochloric acid, sulfuric acid or the like, or an organic acid such as citric acid or malic acid is generally used, but a washing solution for washing in a heated state with a chelating agent or the like is also included. Auxiliary agents such as surfactants and corrosion inhibitors are added to these cleaning liquids in addition to acids and the like as main agents.
【００１３】これらの洗浄液による化学洗浄は加熱状
態、一般的には７０〜９８℃、好ましくは８０〜９５℃
の加熱状態で、洗浄液を循環しながら行われる。洗浄液
の加熱は一般的には蒸気の吹込によって行われるが、電
熱その他の加熱手段によることができる。また循環は循
環系を通してポンプにより行われる。洗浄工程の進行に
より、酸濃度が低下し、溶出したスケール成分例えば鉄
イオン濃度が上昇して一定値になるので、この時点で循
環を停止し、洗浄工程を終了する。The chemical cleaning using these cleaning liquids is carried out in a heated state, generally at 70 to 98 ° C., preferably at 80 to 95 ° C.
The heating is performed while circulating the cleaning liquid. The cleaning liquid is generally heated by blowing steam, but can be heated by electric heating or other heating means. The circulation is performed by a pump through a circulation system. As the washing process proceeds, the acid concentration decreases, and the eluted scale component, for example, the iron ion concentration, increases to a constant value. At this point, the circulation is stopped and the washing process is terminated.
【００１４】押出水洗工程は、洗浄として一般的には純
水を導入して洗浄排液を押出すとともに、水洗を行う。
このとき洗浄水と洗浄排液を熱交換器に導入して熱交換
壁を介して熱交換を行う。これにより洗浄水を加熱して
ボイラに導入し、また洗浄排液を冷却して排液貯槽に流
入させる。この場合熱交換効率にもよるが、洗浄水は３
０〜５０℃に加熱され、洗浄排液は５０〜７０℃に冷却
される。In the extrusion water washing step, generally, pure water is introduced as a washing to extrude washing waste liquid and washing is performed with water.
At this time, the washing water and the washing waste liquid are introduced into a heat exchanger, and heat exchange is performed through a heat exchange wall. Thereby, the washing water is heated and introduced into the boiler, and the washing waste liquid is cooled and flows into the waste liquid storage tank. In this case, the washing water is 3
It is heated to 0 to 50 ° C, and the washing effluent is cooled to 50 to 70 ° C.
【００１５】加熱された洗浄水をボイラに導入して押出
水洗を行うと、スケール成分の溶解度が高くなるため水
洗効率は高くなり、押出水洗工程が短縮され、洗浄水量
も少なくなる。またボイラの温度低下が小さくなるた
め、次工程の防錆処理液の加熱量は小さくなり、熱効率
が高くなる。When extruded water washing is performed by introducing heated washing water into a boiler, the solubility of scale components is increased, so that the washing efficiency is increased, the extruded washing step is shortened, and the amount of washing water is reduced. Further, since the temperature drop of the boiler is small, the amount of heating of the rust preventive solution in the next step is small, and the thermal efficiency is high.
【００１６】一方、洗浄排液は冷却されて排出されるた
め、そのまま排液貯槽に流入させることができ、冷却水
による冷却は不要になる。このため、従来の冷却水量は
制限でき、排液貯槽の容量も小さくてよくなる。またＦ
ＤＦにより洗浄液を冷却する場合に比較すると、長い冷
却工程がなくなり、洗浄時間を短縮できるとともに、定
期点検作業に影響を与えることがなくなる。On the other hand, since the washing waste liquid is cooled and discharged, it can flow into the waste liquid storage tank as it is, and cooling with cooling water becomes unnecessary. For this reason, the conventional cooling water amount can be limited, and the capacity of the drainage storage tank can be small. Also F
As compared with the case where the cleaning liquid is cooled by the DF, a long cooling step is eliminated, the cleaning time can be shortened, and the regular inspection work is not affected.
【００１７】押出水洗工程が終了すると、防錆処理工程
等の後工程が行われるが、防錆処理工程は防錆処理液を
導入して循環処理することにより防錆処理が行われる。
このとき蒸気吹込等により加熱が行われるが、温度低下
が少ないため加熱熱量は少なくてすみ、効率のよい処理
を行うことができる。When the extrusion water washing step is completed, post-steps such as a rust prevention treatment step are performed. In the rust prevention treatment step, rust prevention treatment is performed by introducing and circulating a rust prevention treatment liquid.
At this time, heating is performed by blowing steam or the like. However, the amount of heating heat is small because the temperature is not reduced so that efficient processing can be performed.
【００１８】防錆処理等の後処理が終了すると、再び洗
浄水による押出水洗が行われるが、この時も防錆処理排
液と洗浄水とを熱交換することにより、水洗効率は高く
なり、水洗時間が短縮される。またボイラ温度低下が小
さいため次の乾燥工程も短縮され、全体の洗浄時間は短
くなる。When the post-treatment such as the rust prevention treatment is completed, the extruded water is washed again with the washing water. At this time, the heat exchange between the rust prevention treatment drainage and the washing water also increases the washing efficiency. Washing time is reduced. Further, since the boiler temperature drop is small, the next drying step is also shortened, and the overall cleaning time is shortened.
【００１９】防錆処理排液も冷却されるため、排液貯槽
に直接流入させることができ、このときの冷却水も必要
でなくなる。最終の水洗工程の洗浄水はそのまま排出さ
れるが、温度は相当低下しているので排液貯槽に流入さ
せても問題はない。洗浄水排出後に乾燥が行われるが、
ボイラは冷却されていないため、乾燥時間は短縮され
る。Since the rust-prevention treatment waste liquid is also cooled, it can flow directly into the waste liquid storage tank, and cooling water at this time is not required. Although the washing water in the final washing step is discharged as it is, since the temperature is considerably lowered, there is no problem even if it flows into the drainage storage tank. Drying is performed after washing water is drained,
The drying time is reduced because the boiler is not cooled.
【００２０】[0020]
【発明の効果】本発明によれば洗浄排液と洗浄水とを熱
交換するようにしたので、洗浄排液から熱を回収して洗
浄水の温度を高くし、これにより押出水洗効率を高めて
押出水洗工程を短縮するとともに、次工程の加熱に要す
る熱量を少なくし、かつ洗浄排液の温度を低くすること
により冷却水の量を少なくするとともに排液貯槽の容量
を小さくすることができ、ＦＤＦによる冷却も不要とな
り、これにより洗浄時間を短縮して効率化することがで
きる。According to the present invention, since the cleaning waste water and the cleaning water are heat-exchanged, heat is recovered from the cleaning waste water to increase the temperature of the cleaning water, thereby increasing the efficiency of the extrusion water cleaning. In addition to shortening the extrusion water washing process, the amount of heat required for heating in the next process is reduced, and the temperature of the washing drainage is reduced, so that the amount of cooling water can be reduced and the capacity of the drainage tank can be reduced. Also, cooling by the FDF is not required, thereby shortening the cleaning time and improving the efficiency.
【００２１】[0021]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１および図２は別の実施形態の
化学洗浄方法を示すフロー図であり、図３と同一符号は
同一または相当部分を示し、１１は熱交換器である。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are flowcharts showing a chemical cleaning method according to another embodiment. The same reference numerals as in FIG. 3 denote the same or corresponding parts, and reference numeral 11 denotes a heat exchanger.
【００２２】図１の化学洗浄方法は、弁Ｖ1、Ｖ2、Ｖ3
を開き（他は閉）、給液路４からポンプ２により洗浄液
をボイラ１に導入して取出路５から取出し、循環路６か
ら循環して化学洗浄を行う。その間洗浄液は蒸気吹込等
により加熱状態に保つ。洗浄の進行により水管内のスケ
ールが溶解して洗浄液の酸濃度は低下し、スケール成分
濃度例えば鉄イオン濃度は高くなる。これらの濃度が一
定になった段階で洗浄工程を終り、押出水洗工程に移
る。The chemical cleaning method shown in FIG. 1 uses the valves V 1 , V 2 , V 3
Is opened (the others are closed), the cleaning liquid is introduced into the boiler 1 by the pump 2 from the liquid supply path 4, taken out from the extraction path 5, and circulated through the circulation path 6 to perform chemical cleaning. During that time, the cleaning liquid is kept in a heated state by blowing steam or the like. As the washing proceeds, the scale in the water tube dissolves, and the acid concentration of the washing liquid decreases, and the scale component concentration, for example, the iron ion concentration increases. At the stage when these concentrations have become constant, the washing step is completed and the process proceeds to the extrusion water washing step.
【００２３】押出水洗工程は弁Ｖ1〜Ｖ3を閉じ、Ｖ4〜
Ｖ7を開き、給水路７から弁Ｖ4を通して洗浄水として純
水を供給して、ポンプ２により弁Ｖ5から熱交換器１１
を通してボイラ１に導入し、ボイラ１内の洗浄液を洗浄
排液として押出し、ボイラ１内を水洗する。洗浄排液は
弁Ｖ6から熱交換器１１を通して熱交換し、弁Ｖ7を通し
て排液貯槽３に流入し、さらに排出路９から排液処理装
置に送られる。In the extrusion water washing step, the valves V 1 to V 3 are closed and V 4 to V 3
Open V 7, by supplying pure water as the cleaning water from the water supply passage 7 through valve V 4, the heat exchanger 11 from the valve V 5 by a pump 2
Through the boiler 1, the cleaning liquid in the boiler 1 is extruded as cleaning drainage, and the inside of the boiler 1 is washed with water. The cleaning waste liquid exchanges heat from the valve V 6 through the heat exchanger 11, flows into the waste liquid storage tank 3 through the valve V 7 , and is further sent from the discharge passage 9 to the waste liquid treatment device.
【００２４】給水路７から入る洗浄水は熱交換器１１に
おいて加熱されるため、ボイラ１内に導入された際にお
けるスケール成分の溶解性が高くなり、これにより水洗
効率が高くなって、水洗時間を短縮し、またボイラ１の
温度低下を防ぐ。一方ボイラ１から排出される洗浄排液
は熱交換器１１で冷却されるため排液貯槽３へ直接流入
させることが可能になり、冷却水を予め張っておく必要
はなくなる。押出水洗の終点は洗浄排液中の酸濃度また
はスケール成分濃度、例えば鉄イオン濃度の測定により
決めることができる。Since the washing water entering from the water supply channel 7 is heated in the heat exchanger 11, the solubility of the scale component when introduced into the boiler 1 increases, thereby increasing the washing efficiency and the washing time. And the temperature of the boiler 1 is prevented from lowering. On the other hand, the washing waste liquid discharged from the boiler 1 is cooled by the heat exchanger 11, so that it can flow directly into the waste liquid storage tank 3, and there is no need to fill cooling water in advance. The end point of the extrusion water washing can be determined by measuring the acid concentration or the scale component concentration in the washing effluent, for example, the iron ion concentration.
【００２５】押出水洗工程終了の時点で弁Ｖ4〜Ｖ7を閉
じ、弁Ｖ1〜Ｖ3を開いて防錆処理剤を注入しながら液を
循環し、防錆処理を行う。このとき蒸気を吹込んで循環
する防錆処理液を加熱するが、押出水洗工程におけるボ
イラの温度低下が小さいことから、ここで加える熱量は
少なくなる。At the end of the extruding water washing step, the valves V 4 to V 7 are closed, and the valves V 1 to V 3 are opened to circulate the liquid while pouring the rust preventive agent, thereby performing the rust preventive treatment. At this time, the rust preventive solution circulating by blowing steam is heated, but the amount of heat applied here is small because the temperature drop of the boiler in the extrusion water washing step is small.
【００２６】防錆処理工程を終了すると前回と同様の押
出水洗工程を行う。この場合弁Ｖ1〜Ｖ3を閉じ、弁Ｖ4
〜Ｖ7を開いて洗浄水として純水を導入し、熱交換器１
１を通してボイラ１に導入し、洗浄排液は熱交換器１１
を通して排液貯槽３に流入させる。この場合も洗浄水の
加熱により水洗効率は高くなるとともにボイラの温度低
下は抑えられ、また洗浄排液は冷却されるため排液貯槽
３へ直接流入させることが可能となる。When the rust prevention process is completed, the same extrusion water washing process as the previous process is performed. In this case, the valves V 1 to V 3 are closed and the valve V 4
~V 7 introducing pure water as wash water open, the heat exchanger 1
1 and is introduced into the boiler 1, and the washing wastewater is supplied to the heat exchanger 11.
Through the drainage tank 3. Also in this case, the washing efficiency is increased by heating the washing water, and the temperature of the boiler is suppressed from being lowered. In addition, since the washing waste liquid is cooled, it becomes possible to directly flow into the waste liquid storage tank 3.
【００２７】最終の押出水洗工程終了後、ボイラ１から
水抜して乾燥が行われるが、このときボイラ１は温度低
下が防止されているので、乾燥時間は短縮される。排出
される洗浄排水は通常は排液貯槽以外の系に回収される
が、排液貯槽３に流入させる場合でも、温度が相当程度
低下しているので、直接排液貯槽３に回収することがで
きる。After the final extruding water washing step is completed, the boiler 1 is drained and dried. At this time, since the temperature of the boiler 1 is prevented from lowering, the drying time is shortened. The discharged washing wastewater is usually collected in a system other than the drainage storage tank. However, even when the washing wastewater is allowed to flow into the drainage storage tank 3, it can be directly collected in the drainage storage tank 3 because the temperature is considerably reduced. it can.
【００２８】上記図１の方法はポンプ２により洗浄水を
吸引して注入する例であるが、図２は洗浄水としての純
水が相当の圧力で供給する場合の例を示す。図２では弁
Ｖ8を開いて給水管７からポンプ２により洗浄液をボイ
ラ１に導入した後、弁Ｖ1を開き弁Ｖ8を閉じて循環路６
から循環して化学洗浄を行う。The method shown in FIG. 1 is an example in which the cleaning water is sucked by the pump 2 and injected. FIG. 2 shows an example in which pure water as the cleaning water is supplied at a considerable pressure. After introducing a cleaning liquid to the boiler 1 by 2 in the pump 2 from the water supply pipe 7 by opening the valve V 8, the circulation path by closing the opening valve V 8 with the valve V 1 6
Circulates through to perform chemical cleaning.
【００２９】押出洗浄工程は弁Ｖ1を閉じ、Ｖ8、Ｖ9を
開いて給水路７から洗浄水として純水を供給し、熱交換
器１１を通して加熱してポンプ２によりボイラ１に注入
する。そして洗浄排水は弁Ｖ9から熱交換器１１を通し
て冷却し排液貯槽３に流入させる。熱交換器１１は並流
式でも向流式でもよい。防錆処理工程、最終押出水洗工
程、乾燥工程は前記と同様に行われる。In the extrusion washing step, the valves V 1 are closed, V 8 and V 9 are opened, pure water is supplied from the water supply channel 7 as washing water, heated through the heat exchanger 11 and injected into the boiler 1 by the pump 2. . The washing waste water is cooled from the valve V 9 through the heat exchanger 11 and flows into the drainage storage tank 3. The heat exchanger 11 may be a co-current type or a counter-current type. The rust prevention treatment step, the final extrusion water washing step, and the drying step are performed in the same manner as described above.
【００３０】[0030]
【実施例】以下、本発明の実施例について説明する。 実施例１ 蒸発量１７１０トン／ｈｒの貫流ボイラを図２に示す方
法で化学洗浄した。化学洗浄液はクエン酸１．５重量％
とグリコール酸１．５重量％と腐食抑制剤を含む有機酸
水溶液、洗浄工程における温度は９０℃、洗浄時間は６
時間である。上記の洗浄工程終了後、押出水洗工程に移
り、洗浄水として純水を供給し、熱交換器１１で熱交換
して押出、水洗を行った。押出水洗開始後の洗浄水なら
びに洗浄排水の熱交換器（ＨＥ）入口および出口の温度
変化を表１に示す。Embodiments of the present invention will be described below. Example 1 A once-through boiler having an evaporation amount of 1710 tons / hr was chemically cleaned by the method shown in FIG. Chemical cleaning solution is citric acid 1.5% by weight
And an organic acid aqueous solution containing 1.5% by weight of glycolic acid and a corrosion inhibitor, the temperature in the washing step is 90 ° C., and the washing time is 6 hours.
Time. After the above-mentioned washing step, the process was moved to an extrusion washing step, pure water was supplied as washing water, and heat was exchanged in the heat exchanger 11 to carry out extrusion and washing. Table 1 shows the temperature changes at the inlet and outlet of the heat exchanger (HE) of the washing water and the washing wastewater after the start of the extrusion water washing.
【００３１】[0031]
【表１】 [Table 1]
【００３２】表１の結果より、洗浄水は３５℃前後のほ
ぼ一定温度に加熱され、洗浄排液は６０℃前後（７０℃
以下）のほぼ一定温度に冷却されていることがわかる。
また押出洗浄時間は熱交換しない場合は６０〜７５分間
であるので、約１５〜３０分間短縮されることがわか
る。また次工程の防錆処理工程では加熱時間が少なくて
済み、２時間短縮できた。According to the results shown in Table 1, the washing water was heated to a substantially constant temperature of about 35 ° C., and the washing drainage was heated to about 60 ° C. (70 ° C.).
It can be seen that it has been cooled to a substantially constant temperature in the following.
In addition, since the extrusion cleaning time is 60 to 75 minutes when heat exchange is not performed, it can be seen that the time is reduced by about 15 to 30 minutes. In the next rust prevention treatment step, the heating time was short, and the time was shortened by two hours.
【図１】実施形態の化学洗浄方法のフロー図である。FIG. 1 is a flowchart of a chemical cleaning method according to an embodiment.
【図２】他の実施形態の化学洗浄方法のフロー図であ
る。FIG. 2 is a flowchart of a chemical cleaning method according to another embodiment.
【図３】従来の化学洗浄方法のフロー図である。FIG. 3 is a flowchart of a conventional chemical cleaning method.
１ ボイラ ２ ポンプ ３ 排液貯槽 ４ 給液路 ５ 取出路 ６ 循環路 ７ 給水路 ８ 排液路 ９ 排出路 １１ 熱交換器 DESCRIPTION OF SYMBOLS 1 Boiler 2 Pump 3 Drainage storage tank 4 Liquid supply path 5 Extraction path 6 Circulation path 7 Water supply path 8 Drainage path 9 Drainage path 11 Heat exchanger
Claims (1)
状態で循環して洗浄する洗浄工程と、 ボイラに洗浄水を導入し、洗浄排液を押出すとともに水
洗する押出水洗工程とを含み、 押出水洗工程ではボイラから排出する洗浄排液と導入す
る洗浄水とを熱交換器に導入して熱交換し、洗浄排液を
冷却して排出するとともに洗浄水を加熱し、加熱状態の
洗浄水で押出水洗を行うことを特徴とするボイラの化学
洗浄方法。1. A cleaning step of introducing a chemical cleaning liquid into a boiler and circulating and cleaning it in a heated state, and an extruding water washing step of introducing washing water into the boiler, extruding washing wastewater and washing with water, In the extrusion water washing process, the washing wastewater discharged from the boiler and the washing water to be introduced are introduced into a heat exchanger to exchange heat, and the washing wastewater is cooled and discharged, and the washing water is heated. A chemical cleaning method for a boiler, wherein the extruder is washed with water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30430197A JPH11141804A (en) | 1997-11-06 | 1997-11-06 | Method of chemically cleaning boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30430197A JPH11141804A (en) | 1997-11-06 | 1997-11-06 | Method of chemically cleaning boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11141804A true JPH11141804A (en) | 1999-05-28 |
Family
ID=17931394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30430197A Pending JPH11141804A (en) | 1997-11-06 | 1997-11-06 | Method of chemically cleaning boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11141804A (en) |
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