JP2007138219A - Corrosion prevention method for boiler in rest - Google Patents
Corrosion prevention method for boiler in rest Download PDFInfo
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- JP2007138219A JP2007138219A JP2005331493A JP2005331493A JP2007138219A JP 2007138219 A JP2007138219 A JP 2007138219A JP 2005331493 A JP2005331493 A JP 2005331493A JP 2005331493 A JP2005331493 A JP 2005331493A JP 2007138219 A JP2007138219 A JP 2007138219A
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- boiler
- water
- ammonia
- corrosion prevention
- pure water
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
- C23F11/181—Nitrogen containing compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/025—Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
本発明は休止中にあるボイラの防食方法、特に薬品を含む水でボイラを満水にして保存するボイラの防食方法に関する。 The present invention relates to an anticorrosion method for a boiler that is at rest, and more particularly to an anticorrosion method for a boiler in which the boiler is filled with water containing chemicals and stored.
ボイラプラントの運転を休止させると、ボイラ水が温度低下して大気圧以下の負圧となり、酸素を含む外気を吸って腐食発生の原因となる。そこで、１週間以上等の比較的長期
にわたって休止させる場合、休止中におけるボイラの腐食を防止することが必要とされる
。
When the operation of the boiler plant is stopped, the temperature of the boiler water decreases to a negative pressure below atmospheric pressure, and the outside air containing oxygen is sucked to cause corrosion. Therefore, when a pause is made for a relatively long period of time such as one week or longer, it is necessary to prevent the corrosion of the boiler during the pause.
従来、休止中のボイラプラントの腐食防止に関し、ボイラ水を完全にブローし、シリカ
ゲルなどの乾燥剤をボイラ缶内に配置して乾燥する方法や、窒素ガスでボイラ缶内を密閉
する乾燥保存方法が採用されている（ＪＩＳ Ｂ８２２３ １９９９）。
Conventionally, with regard to preventing corrosion of a boiler plant that is out of service, the boiler water is completely blown and a desiccant such as silica gel is placed in the boiler can for drying, or the dry preservation method for sealing the inside of the boiler can with nitrogen gas. Is adopted (JIS B8223 1999).
一方、排水不可能な場合やボイラ構造が複雑で、完全にボイラ水をブロー出来ない場合
には、上記乾燥保存方法を採用することが困難となり、それに替えて満水保存方法が採用
される（ＪＩＳ Ｂ８２２３ １９９９）。
On the other hand, when the drainage is impossible or the boiler structure is complicated and the boiler water cannot be completely blown, it is difficult to adopt the dry preservation method, and the full water preservation method is adopted instead (JIS standard). B8223 1999).
この方法は、純水または軟水にヒドラジンを１００〜１０００ｍｇ／ｌ添加するか、ま
たは亜硝酸ナトリウムを２００〜５００ｍｇ／ｌ添加して、満水保存するものである。
In this method, hydrazine is added to pure water or soft water in an amount of 100 to 1000 mg / l, or sodium nitrite is added in an amount of 200 to 500 mg / l and stored in a full water.
近年、これらに代わる上記満水保存方法として、モノエタノールアミン、モノイソプロ
パノールアミン、シクロヘキシルアミン、２−アミノー２−メチルー１−プロパノールお
よびモルフォリン等の中和性アミンを１００〜２００ｍｇ／ｌ添加する方法が提案されて
いる（特開２００２−１２９３６６号公報）。
In recent years, as a method for preserving full water instead of these, there is a method of adding 100 to 200 mg / l of neutralizing amine such as monoethanolamine, monoisopropanolamine, cyclohexylamine, 2-amino-2-methyl-1-propanol and morpholine. It has been proposed (Japanese Patent Laid-Open No. 2002-129366).
しかし、このような従来方法では、以下のような問題があった。 However, such a conventional method has the following problems.
すなわち、乾燥保存方法では、休止期間が長期間にわたる場合に乾燥剤を定期的に交換
しなければならず、手間がかかる。
That is, in the dry preservation method, when the rest period is long, the desiccant must be periodically replaced, which is troublesome.
ヒドラジンは発癌性に関与している疑いがあるので、その使用が避けられてきている。
また亜硝酸ナトリウムは固形成分であるため、スーパーヒーターやタービンを有するボイ
ラでは、保缶後に純水による逆流洗浄が可能な場合にしか適用することができない。
Since hydrazine is suspected to be involved in carcinogenicity, its use has been avoided.
In addition, since sodium nitrite is a solid component, the boiler having a super heater and a turbine can be applied only when backflow cleaning with pure water is possible after holding.
中和性アミンには上記のような問題は解決されているものの、運転圧力や過熱器の温度
が高いボイラ等では、復水回収率にもよるが、運転水に中和性アミンが混入するとアミン
の熱分解により有機酸や二酸化炭素が発生し、給復水やボイラ水のｐＨを低下させたり、
給水や蒸気の酸導電率を上昇させ、運転に支障をきたす恐れがあるため、運転再開時には
保存処理水を全ブローすると共に、排水不可能な部分がある場合には、純水を用いて十分
に洗浄する必要が生じるという問題がある。また、一部の中和性アミンには米国ＦＤＡ規
格のボイラ添加剤にあげられているものもあるが、日本では食品添加剤として認可されて
おらず、蒸気が直接人体や食品等に触れる場合には、安全性の面でユーザーの理解が得ら
れにくい。
Since the acid conductivity of the water supply and steam may be increased, which may hinder operation, when the operation is resumed, all the stored treated water is blown, and if there is a part that cannot be drained, pure water is sufficient. There is a problem in that it becomes necessary to clean. Some neutralizing amines are listed as US FDA-standard boiler additives, but they are not approved as food additives in Japan, and steam directly touches the human body or food. However, it is difficult to obtain the user's understanding in terms of safety.
本発明の課題は、どのようなボイラにも適用可能であり、人体に対する安全性も高く、
長期間にわたって高い防食効果を得ることができる休止中のボイラの防食方法を提案する
ことである。
The subject of the present invention can be applied to any boiler, is highly safe for the human body,
It is to propose a method for preventing corrosion of a boiler that is at rest that can obtain a high corrosion protection effect over a long period of time.
本発明は次の休止中のボイラの防食方法である。（１）純水給水のボイラの運転停止後
、アンモニアを添加したボイラ水を供給してボイラを満水にして保存する休止中ボイラの
防食方法。（２）純水給水または軟水給水のボイラの運転停止後、ボイラ水をブローした
後に、アンモニアを添加した純水または軟水を供給してボイラを満水にして保存する休止
中ボイラの防食方法。（３）ボイラが鋼材で構成されている休止中ボイラの防食方法。（
４）ボイラが過熱器を有し、かつ、復水回収率が５０％以上で運転されるものである休止
中ボイラの防食方法。
The present invention is the following boiler anticorrosion method. (1) An anticorrosion method for a paused boiler that supplies boiler water to which ammonia is added and stops the boiler after it has been shut down after the operation of the boiler for pure water supply is stopped. (2) An anti-corrosion method for a suspended boiler in which pure water or soft water supply boiler is stopped, blown boiler water, and then supplied with pure water or soft water to which ammonia is added to fill the boiler and store it. (3) Corrosion prevention method for a boiler during a pause in which the boiler is made of steel. (
4) The anti-corrosion method for a boiler during a stop, in which the boiler has a superheater and is operated at a condensate recovery rate of 50% or more.
以上の通り、本発明によれば、ボイラをアンモニア液で満水させる方法によって休止中
のボイラの腐食を簡単に防止できるので、本発明の防食方法はどのような種類のボイラに
も適用可能であり、例えば乾燥保存方法が適用できないボイラや、亜硝酸ナトリウム等の
固体の防食剤を用いる満水保存が適用できないボイラであっても、腐食を防止することが
できる。さらに本発明のボイラの防食方法を用いると、ボイラが長期間にわたって休止し
保管される場合であっても、高い防食効果が維持される。
As described above, according to the present invention, the corrosion of the idle boiler can be easily prevented by the method of filling the boiler with the ammonia solution, so the anticorrosion method of the present invention can be applied to any type of boiler. For example, even a boiler to which a dry preservation method cannot be applied and a boiler to which full water storage using a solid anticorrosive agent such as sodium nitrite cannot be applied can prevent corrosion. Furthermore, when the boiler anticorrosion method of the present invention is used, a high anticorrosion effect is maintained even when the boiler is suspended and stored for a long period of time.
また、アンモニアは炭素を含まないことから、保存処理後に全ブローや十分な洗浄を行
わなくても、ボイラの運転再開後に熱分解性生物等による有機酸、二酸化炭素の生成によ
る給復水やボイラ水のｐＨ低下を招くことなく、給水や上記の酸導電率を上昇させて運転
に支障をきたすこともない。添加量についても、中和製アミンに比べてより少ない量で良
好な保缶効果が得られる。
In addition, ammonia does not contain carbon, so even if it is not completely blown or washed thoroughly after the storage process, after resuming operation of the boiler, organic acid by pyrolyzable organisms, etc. Without lowering the pH of the water, the water supply and the above acid conductivity are not increased to hinder the operation. As for the addition amount, a good canning effect can be obtained with a smaller amount than that of the neutralized amine.
さらに、本発明で用いられるアンモニアは米国ＦＤＡ規格のボイラ用添加剤として記載
されているうえ、日本の食品添加物としても認定されているなど、人体に対する安全性が
高いので、ボイラ休止後の運転再開後に得られるボイラ水は人体に有害な物質を含む可能
性が低い。
Furthermore, since ammonia used in the present invention is described as an additive for boilers in the US FDA standard and is also certified as a Japanese food additive, it is highly safe for the human body. The boiler water obtained after resumption is unlikely to contain substances harmful to the human body.
本発明において軟水とは、軟水処理を施した水を意味し、具体的には硬度（ＣａＣＯ3
）が１ｍｇ／Ｌｉｔｅｒ以下のものであることが好ましい。
In the present invention, soft water means water subjected to soft water treatment, specifically, hardness (CaCO3
) Is preferably 1 mg / liter or less.
本発明の防食方法は、どのようなボイラにも適用可能であり、具体的には丸ボイラ、水
管ボイラ、貫流ボイラ、特殊ボイラ等をあげることができる。これらボイラは低圧、中圧
、高圧のいずれのボイラでもよい。また本発明の防食方法はスーパーヒーターやタービン
を有するボイラ等において逆流洗浄が不可能なボイラにも適用可能である。
The anticorrosion method of the present invention can be applied to any boiler, and specifically includes a round boiler, a water tube boiler, a once-through boiler, a special boiler, and the like. These boilers may be any of low pressure, medium pressure, and high pressure. The anticorrosion method of the present invention can also be applied to a boiler that cannot be backwashed in a boiler having a super heater or a turbine.
本発明の対象となるボイラとしては、純水または軟水給水ボイラが好適である。 As the boiler to be the subject of the present invention, a pure water or soft water feed water boiler is suitable.
本発明の防食方法は、このようなボイラについて、原水の違いに応じて以下のように行
う。
The anticorrosion method of this invention is performed as follows about such a boiler according to the difference in raw | natural water.
まず純水給水ボイラの場合、ボイラ運転停止後に、アンモニアを添加したボイラ水（給
水）を供給してボイラを満水にする。ボイラ運転中は、常に蒸気が発生しているので、ボ
イラ水は常用水位近傍にあり、上部は気相部となっている。そこで、ボイラ水を追加供給
してボイラを満水にするが、その際、アンモニアをボイラ水に添加する。
First, in the case of a pure water supply boiler, after the boiler operation is stopped, boiler water (feed water) to which ammonia is added is supplied to fill the boiler. Since steam is always generated during boiler operation, the boiler water is in the vicinity of the normal water level, and the upper part is a gas phase part. Therefore, additional boiler water is supplied to fill the boiler, and ammonia is added to the boiler water.
こうして満水にした後にこの状態を保存することにより、休止中のボイラを腐食から守
る。
By preserving this state after the water is full, the resting boiler is protected from corrosion.
次に軟水給水ボイラの場合、ボイラ停止後に一旦ボイラ水をブローする。軟水給水では
、ボイラ水がボイラ運転中に濃縮され、いろいろな成分を濃縮して含むため、そのままボ
イラを休止状態にすると、ボイラの腐食原因になる可能性があるため、一旦ボイラ水をブ
ローするのである。なお、ブローは全ブローが好ましいが、全ブロー出来ない場合には、
極力ボイラ水を排出し、その後、残存しているボイラ水を給水で置換するようにブローを
行うことが好ましい。
Next, in the case of a soft water supply boiler, boiler water is once blown after the boiler stops. In soft water supply, boiler water is concentrated during boiler operation and contains various components, so if the boiler is put into a dormant state as it may cause corrosion of the boiler, the boiler water is blown once. It is. In addition, all blows are preferable for blow, but when full blow is not possible,
It is preferable to blow the boiler water as much as possible and then replace the remaining boiler water with the feed water.
なお、上述の純水給水の場合でも、清缶剤としてリン酸塩や水酸化アルカリを使用して
いる場合で、満水にするとスーパーヒーター等にボイラ水が入る恐れがある場合等、ボイ
ラ水の水質や設備状況に応じてボイラ水を前記同様にブローする必要がある。
In addition, even in the case of the above-mentioned pure water supply, when using a phosphate or alkali hydroxide as a cleansing agent, and when there is a risk of boiler water entering the super heater etc. when the water is full, boiler water It is necessary to blow the boiler water in the same manner as described above according to the water quality and the equipment status.
次に空になったボイラに、アンモニアを添加した軟水または純水をボイラが満水するま
で供給する。
Next, soft water or pure water added with ammonia is supplied to the emptied boiler until the boiler is full.
いずれの場合にも、アンモニアの添加濃度は、水質条件や保存期間等によって調整する
必要があるが、一般的には、１０〜５００ｍｇ／ｌ、好ましくは２０〜３００ｍｇ／ｌ、
更に好ましくは３０〜１００ｍｇ／ｌ程度とする。
In any case, the concentration of ammonia to be added needs to be adjusted depending on the water quality conditions, the storage period, etc., but generally 10 to 500 mg / l, preferably 20 to 300 mg / l,
More preferably, it is about 30 to 100 mg / l.
アンモニアが注入される結果、ボイラ内に存在する二酸化炭素、その他の酸性物質を中
和してボイラ缶水のｐＨを上昇させ、ボイラ缶水をアルカリ性に保つことにより、ボイラ
の腐食が長期間にわたって防止される。
As a result of the injection of ammonia, carbon dioxide and other acidic substances present in the boiler are neutralized to raise the pH of the boiler can water and keep the boiler can water alkaline so that the corrosion of the boiler is prolonged. Is prevented.
アンモニアの添加濃度が１０ｍｇ／ｌ以上で上記の防食効果が得られ、添加濃度が高く
なるほど防食効果も高まるが、経済性の面から５００ｍｇ／ｌ程度が上限となり、また、
臭気の面からより好ましくは３００ｍｇ／ｌを上限とする。
The above-mentioned anticorrosion effect is obtained when the concentration of ammonia added is 10 mg / l or more, and the anticorrosion effect increases as the addition concentration increases, but the upper limit is about 500 mg / l in terms of economy,
More preferably, the upper limit is 300 mg / l in terms of odor.
アンモニアを添加した水のｐHは９．５以上、好ましくは１０以上とすることが望まし
い。このとき、設定状況によっては、一般に清缶剤として用いられるリン酸塩や水酸化ア
ルカリ等を併用しても良い。
It is desirable that the pH of water added with ammonia is 9.5 or more, preferably 10 or more. At this time, depending on the setting condition, a phosphate, an alkali hydroxide or the like generally used as a cleansing agent may be used in combination.
アンモニアの添加は、各給水に直接アンモニアガスとして添加しても良いし、アンモニ
ア水として添加しても良い。
The addition of ammonia may be added directly to each water supply as ammonia gas or may be added as ammonia water.
アンモニアはＦＤＡ規格のボイラ用添加剤として記載されており、日本でも食品添加物
として認定されている化合物であり、上記使用濃度において、安全性が高い。
Ammonia is described as an additive for boilers of the FDA standard, and is a compound that has been certified as a food additive in Japan.
本発明の対象とするボイラは高濃度のアンモニアによる銅の腐食の心配がないという理
由で鋼材製のボイラが好ましい。また、復水器や低圧給水加熱器等で銅材質が使用されて
いる場合は、保缶後に全ブローするとともに、排水不可能な部分がある場合は、純水で十
分洗浄するか、立上げ後の蒸気を大気放出し、アンモニアが所定濃度以下となってから蒸
気の供給を開始する等の措置をとる必要がある。さらに過熱器が設置され、復水回収率が
５０％以上のボイラでは、アミンで保缶すると運転水に中和性アミンが混入してアミンの
熱分解により有機酸や二酸化炭素が発生し、給復水やボイラ水のｐＨを低下させたり、給
水や蒸気の酸導電率を上昇させ、運転に支障をきたす恐れがある。しかし、本発明ではこ
のような心配がないため、本発明が好適に適用される。
The boiler which is the object of the present invention is preferably a steel boiler because there is no concern about copper corrosion due to high concentration of ammonia. If copper material is used in condensers, low-pressure feed water heaters, etc., blow all after canning, and if there is any part that cannot be drained, either wash thoroughly with pure water or start up It is necessary to take measures such as releasing the steam afterwards into the atmosphere and starting the supply of steam after the ammonia concentration falls below a predetermined concentration. Furthermore, in a boiler with a superheater installed and a condensate recovery rate of 50% or more, if it can be kept with amine, neutralizing amine is mixed into the operating water, and organic acid and carbon dioxide are generated due to thermal decomposition of the amine. There is a risk of lowering the pH of condensate or boiler water, increasing the acid conductivity of water supply or steam, and hindering operation. However, in the present invention, since there is no such concern, the present invention is preferably applied.
上記のようにしてアンモニア液で満水にされたボイラの保存が長期にわたる場合には、
定期点検を行うことが好ましい。例えば月に１〜２回程度アンモニアの濃度やｐＨ、腐食
生成物である鉄イオンを調査し、アンモニアの濃度またはｐＨの低下や、鉄イオンの濃度
の上昇が認められた場合には、アンモニアをボイラ内に追加注入することが好ましい。こ
の場合、ボイラ水の一部をブローし、ボイラ水中のアンモニア濃度が所定の濃度となるよ
うにアンモニアを添加しながら給水する。このときボイラ水中のアンモニア濃度が均一に
なるよう、ボイラ水を一部抜いた際にボイラ水を加熱して対流させることが好ましい。
If the boiler filled with ammonia solution as described above is stored for a long time,
It is preferable to perform periodic inspections. For example, once a month, the concentration and pH of ammonia and iron ions that are corrosion products are investigated. If a decrease in ammonia concentration or pH or an increase in iron ion concentration is observed, ammonia is It is preferable to perform additional injection into the boiler. In this case, a part of boiler water is blown, and water is supplied while adding ammonia so that the ammonia concentration in the boiler water becomes a predetermined concentration. At this time, it is preferable that the boiler water is heated and convected when part of the boiler water is withdrawn so that the ammonia concentration in the boiler water becomes uniform.
ボイラを満水にする純水または軟水には、アンモニアの他に必要に応じて公知のボイラ
水処理用添加剤を添加しても良い。
In addition to ammonia, a known boiler water treatment additive may be added to the pure water or soft water that fills the boiler if necessary.
そのようなボイラ水処理用添加剤としては、例えばジエチルヒドロキシルアミン、イソ
プロピルヒドロキシルアミン、１−アミノピロリジン、１−アミノ−４−メチルピペラジ
ン、カルボヒドラジド、リン酸三ナトリウム、リン酸水素二ナトリウム、トリポリリン酸
ナトリウムおよび水酸化ナトリウムがあげられ、これらの１種または２種以上を選択して
添加する。
Examples of such boiler water treatment additives include diethylhydroxylamine, isopropylhydroxylamine, 1-aminopyrrolidine, 1-amino-4-methylpiperazine, carbohydrazide, trisodium phosphate, disodium hydrogen phosphate, tripolylin Examples thereof include sodium acid and sodium hydroxide, and one or more of these are selected and added.
休止期間が終了後、ボイラの運転を再開するときには、必要に応じて保管処理水の全
部または一部をブローした後、水張りをして運転を開始する。その際、必要に応じて清缶
剤や脱酸素剤等を注入しても良い。
When the operation of the boiler is resumed after the suspension period is over, all or part of the stored treated water is blown as necessary, and then the operation is started with water filling. In that case, you may inject | pour a cleaning agent, a deoxidation agent, etc. as needed.
ブロー水は所定の排水基準を満たすように処理してから放流する。 The blow water is discharged after being treated so as to satisfy a predetermined drainage standard.
なおヒドラジンや亜硝酸ナトリウムは使用しないことが好ましい。 It is preferable not to use hydrazine or sodium nitrite.
以下、具体例によってさらに本発明を説明するが、本発明はこれらに限定されるもので
はない。実施例１〜７は、純水に表１に示す薬剤を添加して５００ｍｌにメスアップした
ものを容量５００ｍＬの樹脂製ビーカーに入れ、ここに鋼材性試験片（１ｍｍ×３０ｍｍ
×５０ｍｍ）を２枚浸漬し、ビーカー上部に樹脂製シートで蓋をして室温にて静置した。
表１に示した期間経過後に試験片を引き上げ、発錆の有無を目視により観察した。結果を
表１に示す。なお、表中のＭＥＡはモノエタノールアミン、ＭＩＰＡはモノイソプロパノ
ールアミン、ＣＨＡはシクロヘキシルアミン、をそれぞれ示す。
Hereinafter, the present invention will be further described with reference to specific examples, but the present invention is not limited thereto. In Examples 1 to 7, the chemicals shown in Table 1 were added to pure water and the volume up to 500 ml was put into a resin beaker having a capacity of 500 mL, and a steel material test piece (1 mm × 30 mm) was placed here.
X50 mm) were immersed, and the top of the beaker was covered with a resin sheet and allowed to stand at room temperature.
After the period shown in Table 1, the test piece was pulled up, and the presence or absence of rusting was visually observed. The results are shown in Table 1. In the table, MEA represents monoethanolamine, MIPA represents monoisopropanolamine, and CHA represents cyclohexylamine.
比較例１は、防食のための薬剤を添加しない点以外、および比較例２〜１２は、アンモ
ニアに替えて公知の中和性アミンを用いた点以外は実施例と同様に試験を行った。
Comparative Example 1 was tested in the same manner as in the Examples except that a chemical for anticorrosion was not added, and Comparative Examples 2 to 12 were used except that a known neutralizing amine was used instead of ammonia.
性アミンに比べて、同量添加量以下で同等以上の防食効果を得られたことがわかる。
本発明により提供される休止中のボイラの運転方法は、丸ボイラ、水管ボイラ、貫流ボ
イラ、特殊ボイラ等ボイラ等、任意のボイラに適用できる。また、使用している薬剤は食
品添加剤として登録されているアンモニアなので、蒸気が直接人体や食品等に触れる場合
にも適用可能である。
The operation method of an idle boiler provided by the present invention can be applied to any boiler such as a round boiler, a water tube boiler, a once-through boiler, and a special boiler. Moreover, since the chemical | medical agent currently used is ammonia registered as a food additive, it is applicable also when vapor | steam touches a human body, a foodstuff, etc. directly.
Claims (4)
してボイラを満水にして保存することを特徴とする休止中ボイラの防食方法。 An anticorrosion method for a suspended boiler, wherein after the operation of a boiler for pure water supply is stopped, boiler water to which ammonia is added is supplied and the boiler is filled and stored.
、アンモニアを添加した純水または軟水を供給してボイラを満水にして保存することを特
徴とする休止中ボイラの防食方法。 Anti-corrosion method for boiler during suspension, characterized by supplying pure water or soft water to which ammonia is added and then storing the boiler with full water after blowing off the boiler water after stopping the operation of pure water supply or soft water supply boiler .
の休止中ボイラの防食方法。 The boiler is made of steel, and the anticorrosion method for a boiler during a pause according to claim 1 or 2.
であることを特徴とする請求項３に記載の休止中ボイラの防食方法。
The boiler anticorrosion method according to claim 3, wherein the boiler has a superheater and is operated at a condensate recovery rate of 50% or more.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005331493A JP4710561B2 (en) | 2005-11-16 | 2005-11-16 | Anti-corrosion method for boilers during suspension |
| PCT/JP2006/322497 WO2007058132A1 (en) | 2005-11-16 | 2006-11-10 | Method of corrosion prevention for resting boiler |
| SG201101095-6A SG169993A1 (en) | 2005-11-16 | 2006-11-10 | Method of corrosion prevention for resting boiler |
| MX2008006299A MX2008006299A (en) | 2005-11-16 | 2006-11-10 | Method of corrosion prevention for resting boiler. |
| CNA2006800430643A CN101310045A (en) | 2005-11-16 | 2006-11-10 | Corrosion prevention method for boiler in rest |
| CN201310445165.5A CN103526210A (en) | 2005-11-16 | 2006-11-10 | Method of corrosion prevention for resting boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005331493A JP4710561B2 (en) | 2005-11-16 | 2005-11-16 | Anti-corrosion method for boilers during suspension |
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| JP4710561B2 JP4710561B2 (en) | 2011-06-29 |
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| JP2005331493A Active JP4710561B2 (en) | 2005-11-16 | 2005-11-16 | Anti-corrosion method for boilers during suspension |
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| Country | Link |
|---|---|
| JP (1) | JP4710561B2 (en) |
| CN (2) | CN101310045A (en) |
| SG (1) | SG169993A1 (en) |
| WO (1) | WO2007058132A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236034A (en) * | 2009-03-31 | 2010-10-21 | Kurita Water Ind Ltd | Corrosion prevention method for boiler in rest condition and anticorrosive for boiler in rest condition |
| JP2016166737A (en) * | 2016-06-21 | 2016-09-15 | 三菱日立パワーシステムズ株式会社 | Boiler operation method and boiler |
| WO2020137496A1 (en) * | 2018-12-27 | 2020-07-02 | 三菱日立パワーシステムズ株式会社 | Method and apparatus for cleaning and maintaining boiler plant |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168273B (en) * | 2011-03-15 | 2012-03-28 | 昆明醋酸纤维有限公司 | Maintaining and energy-saving method for blowout stand-by boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0899086A (en) * | 1994-09-30 | 1996-04-16 | Kurita Water Ind Ltd | Boiler water supply treatment apparatus |
| JPH08219405A (en) * | 1995-02-16 | 1996-08-30 | Kyushu Electric Power Co Inc | Corrosionproof method for boiler equipment |
| JP2000279906A (en) * | 1999-03-30 | 2000-10-10 | Toshiba Corp | Method of washing inside surface of piping in power plant, inside surface washing and maintaining method, and inside surface washing method |
| JP2002129366A (en) * | 2000-10-23 | 2002-05-09 | Kurita Water Ind Ltd | Corrosion prevention method for non-operating boiler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017603A (en) * | 1983-07-08 | 1985-01-29 | 日東化工株式会社 | Method of preventing corrosion of steam boiler |
-
2005
- 2005-11-16 JP JP2005331493A patent/JP4710561B2/en active Active
-
2006
- 2006-11-10 SG SG201101095-6A patent/SG169993A1/en unknown
- 2006-11-10 CN CNA2006800430643A patent/CN101310045A/en active Pending
- 2006-11-10 CN CN201310445165.5A patent/CN103526210A/en active Pending
- 2006-11-10 WO PCT/JP2006/322497 patent/WO2007058132A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0899086A (en) * | 1994-09-30 | 1996-04-16 | Kurita Water Ind Ltd | Boiler water supply treatment apparatus |
| JPH08219405A (en) * | 1995-02-16 | 1996-08-30 | Kyushu Electric Power Co Inc | Corrosionproof method for boiler equipment |
| JP2000279906A (en) * | 1999-03-30 | 2000-10-10 | Toshiba Corp | Method of washing inside surface of piping in power plant, inside surface washing and maintaining method, and inside surface washing method |
| JP2002129366A (en) * | 2000-10-23 | 2002-05-09 | Kurita Water Ind Ltd | Corrosion prevention method for non-operating boiler |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236034A (en) * | 2009-03-31 | 2010-10-21 | Kurita Water Ind Ltd | Corrosion prevention method for boiler in rest condition and anticorrosive for boiler in rest condition |
| JP2016166737A (en) * | 2016-06-21 | 2016-09-15 | 三菱日立パワーシステムズ株式会社 | Boiler operation method and boiler |
| WO2020137496A1 (en) * | 2018-12-27 | 2020-07-02 | 三菱日立パワーシステムズ株式会社 | Method and apparatus for cleaning and maintaining boiler plant |
| JP2020106199A (en) * | 2018-12-27 | 2020-07-09 | 三菱日立パワーシステムズ株式会社 | Cleaning and storage method for boiler plant and cleaning and storage device |
| JP7150594B2 (en) | 2018-12-27 | 2022-10-11 | 三菱重工業株式会社 | Boiler plant cleaning storage method and cleaning storage device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103526210A (en) | 2014-01-22 |
| JP4710561B2 (en) | 2011-06-29 |
| CN101310045A (en) | 2008-11-19 |
| WO2007058132A1 (en) | 2007-05-24 |
| SG169993A1 (en) | 2011-04-29 |
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