JPS6055596B2 - Corrosion protection equipment for power plants - Google Patents
Corrosion protection equipment for power plantsInfo
- Publication number
- JPS6055596B2 JPS6055596B2 JP59201786A JP20178684A JPS6055596B2 JP S6055596 B2 JPS6055596 B2 JP S6055596B2 JP 59201786 A JP59201786 A JP 59201786A JP 20178684 A JP20178684 A JP 20178684A JP S6055596 B2 JPS6055596 B2 JP S6055596B2
- Authority
- JP
- Japan
- Prior art keywords
- nitrogen gas
- storage tank
- corrosion protection
- corrosion
- upper space
- 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.)
- Expired
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【発明の詳細な説明】
本発明は発電プラントの系統配管の防食装置に係り、特
に閉回路の系統配管および機器の腐食を抑制するのに好
適な防食装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion protection device for system piping of a power generation plant, and particularly to a corrosion protection device suitable for suppressing corrosion of closed circuit system piping and equipment.
発電プラントにおいて、接木している配管系統の材料は
、腐食により減肉現象あるいは、腐食生成物の発生によ
る配管や機器への付着、またＳＣＣの発生促進があり、
系統の運転または、機能に障害を与えることになる。In power generation plants, grafted piping system materials may undergo thinning due to corrosion, corrosion products may adhere to piping or equipment, or promote the occurrence of SCC.
This will impede the operation or function of the system.
したがつて系統の運転において腐食抑制がなされる必要
がある。従来の発電プラントにおいては、系統水中に亜
硝酸塩系の防食剤を注入し、その酸化力により系内の表
面に不働態皮膜を形成することにより、腐食を抑制して
いた。しかし、第１図に示すようにその濃度が必要量よ
り低くすると腐食が進行することになる。また、大気に
接する半密閉冷却水系で、水温が５〜５０℃の環境であ
ると、一般的に水中に存在している亜硝酸酸化菌により
、下式（１）の反応が起り、Ｎｏ、４硝酸酸化菌ＮＯ３
−・・・・・・田亜硝酸イオン濃度が低下することにな
る。Therefore, it is necessary to suppress corrosion during system operation. In conventional power plants, corrosion is suppressed by injecting a nitrite-based anticorrosive agent into the system water and using its oxidizing power to form a passive film on the surface of the system. However, as shown in FIG. 1, if the concentration is lower than the required amount, corrosion will progress. In addition, in a semi-closed cooling water system in contact with the atmosphere, in an environment where the water temperature is 5 to 50°C, the reaction of formula (1) below occurs due to nitrite-oxidizing bacteria that generally exist in water. 4 Nitrate oxidizing bacteria NO3
-...The nitrite ion concentration will decrease.
この反応速度は、第２図に示すようになり、ＮＯ。イオ
ン濃度が急激に低下する。本発明は、前記田式の反応を
抑制して亜硝酸イオンの滅失量を極力少なくすることを
目的とする。The reaction rate is as shown in Figure 2, and NO. Ion concentration drops rapidly. The object of the present invention is to suppress the above-mentioned Ta-type reaction and to minimize the amount of nitrite ions lost.
本発明の防食装置は、亜硝酸塩水溶液を貯蔵す）る防食
剤貯蔵タンク、発電プラント冷却系統への防食注入バイ
ブ、前記冷却系統からの系統水戻り管、前記貯蔵タンク
の上部空間の空気を窒素ガスで置換するための、該タン
クに配管を介して接続された窒素ガスボンベ及び貯蔵タ
ンクの上部空間の空気を外部に排出するためのベント管
とを主たる構成要素とすることを特徴とする。The anti-corrosion device of the present invention includes an anti-corrosion agent storage tank for storing an aqueous nitrite solution, an anti-corrosion injection vibe to a cooling system of a power generation plant, a system water return pipe from the cooling system, and a nitrogen gas in the upper space of the storage tank. It is characterized in that its main components include a nitrogen gas cylinder connected to the tank via piping for replacing the gas with gas, and a vent pipe for discharging the air in the upper space of the storage tank to the outside.
第３図は本発明の一実施例を示すもので、発電プラント
冷却系統の閉回路（配管系）及びそれに本発明の防食装
置を適用した場合の系統図を示すものである。FIG. 3 shows one embodiment of the present invention, and shows a closed circuit (piping system) of a power plant cooling system and a system diagram when the corrosion protection device of the present invention is applied thereto.
第３図において、１は防食剤である亜硝酸水溶液２を入
れた貯蔵タンク、３は窒素ガス注入口、４は窒素ガスボ
ンベ、５は貯蔵タンク１の上部空間６の空気を外部に排
出するためのベント管、７は窒素ガス検出器、８は防食
剤注入バイブ、９は冷却系統水戻り管、１０はポンプ、
１１は発電プラントの熱交換器である。本発明において
は、窒素ボンベ３からガス注入口２を通して窒素ガスを
注入することにより、貯蔵タンク１上部空間６の空気を
ベント管５より外部に排出することにより、前記（１）
式の反応を抑制することがで−きるようにしたものであ
る。窒素ガスの置換の終了は窒素ガス検出器７により行
うことができる。本発明においては、窒素ガスが液相に
よく溶解するように、第４図に示すように、系統水の戻
り管９に、散水装置１２を取り付けるのも効果的である
。これにより、窒素ガスとの接水面積が増加し、補給亜
硝酸塩水溶液中の溶存酸素を脱気し易くなる。更に、窒
素ガスを防食剤水溶液中に接触させ、窒素ガスの溶解と
酸素の脱気とを促進するために、第５図に示す窒素ガス
注入口３を液相中に設け、直接亜硝酸塩水溶液中に注入
することもてきる。In Fig. 3, 1 is a storage tank containing an aqueous nitrous acid solution 2, which is an anticorrosive agent, 3 is a nitrogen gas inlet, 4 is a nitrogen gas cylinder, and 5 is a tank for discharging the air in the upper space 6 of the storage tank 1 to the outside. vent pipe, 7 is a nitrogen gas detector, 8 is an anticorrosive injection vibe, 9 is a cooling system water return pipe, 10 is a pump,
11 is a heat exchanger of the power generation plant. In the present invention, by injecting nitrogen gas from the nitrogen cylinder 3 through the gas inlet 2, the air in the upper space 6 of the storage tank 1 is discharged to the outside through the vent pipe 5.
It is possible to suppress the reaction of the formula. The nitrogen gas detector 7 can be used to complete the nitrogen gas replacement. In the present invention, it is also effective to attach a water sprinkler 12 to the return pipe 9 of the system water, as shown in FIG. 4, so that the nitrogen gas is well dissolved in the liquid phase. This increases the water contact area with nitrogen gas, making it easier to degas the dissolved oxygen in the supplementary nitrite aqueous solution. Furthermore, in order to bring nitrogen gas into contact with the anticorrosive aqueous solution and promote dissolution of the nitrogen gas and degassing of oxygen, a nitrogen gas inlet 3 shown in FIG. 5 is provided in the liquid phase to directly inject the nitrite aqueous solution. You can also inject it inside.
・図面の簡単な説明
第１図は亜硝酸イオン濃度と系統の腐食速度との関係を
示すグラフ、第２図は亜硝酸イオンの酸化による濃度の
低下を示すグラフ、第３図は本発明の防食装置を適用し
た発電プラントの一部系統図、第４図は本発明の他の実
施例になる戻り管の先に散水装置を設けた防食装置を示
す図、第５図は窒素ガス注入口を液相に設けた防食装置
を示す図である。- Brief explanation of the drawings Figure 1 is a graph showing the relationship between nitrite ion concentration and corrosion rate of the system, Figure 2 is a graph showing the decrease in concentration due to oxidation of nitrite ions, and Figure 3 is a graph showing the relationship between nitrite ion concentration and corrosion rate of the system. A partial system diagram of a power generation plant to which a corrosion prevention device is applied. Fig. 4 is a diagram showing a corrosion protection device in which a water sprinkler is installed at the end of a return pipe according to another embodiment of the present invention. Fig. 5 is a diagram showing a nitrogen gas inlet. It is a figure which shows the anticorrosion apparatus provided in the liquid phase.
１・・・・・・亜硝酸水溶液貯蔵タンク、２・・・・・
・亜硝酸水溶液、３・・・・・・窒素ガス注入口、４・
・・・・・窒素ガスボンベ、５・・・・・・ベント管、
６・・・・・・貯蔵タンク１の上部空間、７・・・・・
・窒素ガス検出器、８・・・・・・防食剤注入バイブ、
９・・・・・・冷却系統水戻り管、１０・・・・・・ポ
ンプ、１１・・・・・・発電プラントの熱交換器。1... Nitrous acid aqueous solution storage tank, 2...
・Nitrous acid aqueous solution, 3... Nitrogen gas inlet, 4.
...Nitrogen gas cylinder, 5...Vent pipe,
6... upper space of storage tank 1, 7...
・Nitrogen gas detector, 8... Anticorrosive injection vibrator,
9... Cooling system water return pipe, 10... Pump, 11... Heat exchanger of power plant.
Claims (1)
プラント冷却系統への防食剤注入パイプ、前記冷却系統
からの系統水戻り管、前記貯蔵タンクの上部空間の空気
を窒素ガスで置換するための、該タンクに配管を介して
接続された窒素ガスボンベ及び貯蔵タンクの上部空間の
空気を外部に排出するためのベント管とを主たる構成要
素とすることを特徴とする発電プラントの防食装置。1. An anticorrosive storage tank for storing an aqueous nitrite solution, an anticorrosive injection pipe to the power plant cooling system, a system water return pipe from the cooling system, and a system for replacing the air in the upper space of the storage tank with nitrogen gas. A corrosion protection device for a power generation plant, characterized in that the main components include a nitrogen gas cylinder connected to the tank via piping and a vent pipe for discharging air in the upper space of the storage tank to the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59201786A JPS6055596B2 (en) | 1984-09-28 | 1984-09-28 | Corrosion protection equipment for power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59201786A JPS6055596B2 (en) | 1984-09-28 | 1984-09-28 | Corrosion protection equipment for power plants |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60187683A JPS60187683A (en) | 1985-09-25 |
| JPS6055596B2 true JPS6055596B2 (en) | 1985-12-05 |
Family
ID=16446908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59201786A Expired JPS6055596B2 (en) | 1984-09-28 | 1984-09-28 | Corrosion protection equipment for power plants |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055596B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61139882U (en) * | 1985-02-22 | 1986-08-29 | ||
| JPH01128483U (en) * | 1988-02-25 | 1989-09-01 |
-
1984
- 1984-09-28 JP JP59201786A patent/JPS6055596B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61139882U (en) * | 1985-02-22 | 1986-08-29 | ||
| JPH01128483U (en) * | 1988-02-25 | 1989-09-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60187683A (en) | 1985-09-25 |
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