JPS6363876B2 - - Google Patents
Info
- Publication number
- JPS6363876B2 JPS6363876B2 JP55070169A JP7016980A JPS6363876B2 JP S6363876 B2 JPS6363876 B2 JP S6363876B2 JP 55070169 A JP55070169 A JP 55070169A JP 7016980 A JP7016980 A JP 7016980A JP S6363876 B2 JPS6363876 B2 JP S6363876B2
- Authority
- JP
- Japan
- Prior art keywords
- nitrite
- nitrate
- ion concentration
- ions
- concentration
- 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
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 28
- -1 nitrate ions Chemical class 0.000 claims description 27
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 25
- 239000000498 cooling water Substances 0.000 claims description 20
- 229910002651 NO3 Inorganic materials 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000645 desinfectant Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 12
- 239000000243 solution Substances 0.000 description 11
- 229940005654 nitrite ion Drugs 0.000 description 10
- 239000003112 inhibitor Substances 0.000 description 9
- PXIPVTKHYLBLMZ-UHFFFAOYSA-N Sodium azide Chemical compound [Na+].[N-]=[N+]=[N-] PXIPVTKHYLBLMZ-UHFFFAOYSA-N 0.000 description 8
- 241000894006 Bacteria Species 0.000 description 7
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 6
- 235000010288 sodium nitrite Nutrition 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 241000108664 Nitrobacteria Species 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000001580 bacterial effect Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 229940075397 calomel Drugs 0.000 description 2
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical compound Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000010723 turbine oil Substances 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
Landscapes
- Details Of Measuring And Other Instruments (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【発明の詳細な説明】
本発明は亜硝酸塩をインヒビターとして含有す
る水を使用する冷却装置における腐食防止に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to corrosion protection in cooling systems using water containing nitrite as an inhibitor.
冷却用水を循環して使用する冷却装置において
は、装置構成材料、特に炭素鋼の腐食を防ぐ目的
で、一般に該冷却水に亜硝酸ナトリウムなどの亜
硝酸塩を加えている。また、これに用いる水は、
通常イオン交換樹脂を用いて脱塩処理された河川
水もしくは地下水である。このような水には、ニ
トロバクテリアとよばれ、亜硝酸イオンを酸化し
て硝酸イオンに変える能力をもつバクテリアが存
在する。そのため、存在しないはずの硝酸イオン
が、該バクテリアの働きで冷却水中に生じて、し
ばしば炭素鋼等を腐食する。一旦腐食した炭素鋼
の表面には、ニトロバクテリアが好んで生息する
といわれる錆こぶが発生しやすい。そのような錆
こぶの近傍では、硝酸イオン濃度が高まり、終に
は炭素鋼の応力腐食割れを起す場合さえもあつ
た。 In a cooling device that circulates cooling water, a nitrite such as sodium nitrite is generally added to the cooling water in order to prevent corrosion of the materials forming the device, particularly carbon steel. In addition, the water used for this is
This is usually river water or groundwater that has been desalinated using an ion exchange resin. In such water, there are bacteria called nitrobacteria that have the ability to oxidize nitrite ions and convert them into nitrate ions. Therefore, nitrate ions, which should not exist, are generated in the cooling water by the action of the bacteria, and often corrode carbon steel and the like. Once corroded, the surface of carbon steel tends to develop rust lumps, which are said to be a favorite habitat for nitrobacteria. In the vicinity of such rust bumps, the concentration of nitrate ions increases, sometimes even resulting in stress corrosion cracking of carbon steel.
それに対処するには、冷却水中の亜硝酸イオン
および硝酸イオンの濃度を分析し、亜硝酸イオン
濃度を調整すると同時に該バクテリアの活動を抑
えるために薬液を注入していたが、従来は煩雑な
手技的な方法に頼ることが多かつた。ところが、
前記イオンの濃度は、冷却装置の運転状況や季節
によつて大幅に変化するので、実際上満足に制御
されがたく、往々にして上述したような腐食の生
起を避けられなかつた。 To deal with this, the concentration of nitrite and nitrate ions in the cooling water was analyzed, and a chemical solution was injected to adjust the nitrite ion concentration and at the same time suppress the activity of the bacteria, but in the past, this was a complicated procedure. often relied on traditional methods. However,
Since the concentration of the ions varies greatly depending on the operating conditions of the cooling device and the season, it is difficult to control satisfactorily in practice, and the occurrence of corrosion as described above is often unavoidable.
本発明はこのような従来の欠点を排除して、冷
却水中のイオン濃度を効率的に管理して装置構成
材料の腐食を防止し、冷却器の長期にわたる安
全、円滑な運転を保証することを目的としてい
る。その要点は、亜硝酸塩を含む水を循環使用す
る冷却装置において、硝酸イオン濃度自動検出装
置および薬液類自動注入装置を設置し、該冷却水
中の硝酸イオン濃度が予め設定された値を越えた
際に殺菌剤および亜硝酸塩を該水中に自動的に注
入し、硝酸イオン濃度を該設定値以下に維持する
ことである。 The present invention eliminates such conventional drawbacks, efficiently manages the ion concentration in the cooling water, prevents corrosion of equipment constituent materials, and ensures long-term safe and smooth operation of the cooler. The purpose is The key point is that in a cooling system that circulates water containing nitrite, an automatic nitrate ion concentration detection device and an automatic chemical injection device are installed, and when the nitrate ion concentration in the cooling water exceeds a preset value, automatically inject disinfectant and nitrite into the water to maintain the nitrate ion concentration below the set point.
さて、冷却水中の亜硝酸イオンは、式
NO2 -＋1/2O2→NO3 -
で示される反応に従つて酸化されて硝酸イオンと
なる。従つて、硝酸イオン濃度を測れば、硝酸イ
オン生成に費やされた亜硝酸イオンの量がわかる
はずである。 Now, nitrite ions in the cooling water are oxidized to nitrate ions according to the reaction represented by the formula NO 2 - +1/2O 2 →NO 3 - . Therefore, by measuring the nitrate ion concentration, the amount of nitrite ions used to generate nitrate ions should be known.
また、亜硝酸イオンと硝酸イオンとの共存下に
おいて、30℃、浸漬時間500時間で炭素鋼が腐食
する領域と腐食しない領域とを実験的に求めたと
ころ、第１図に示すようになつた。この結果か
ら、許容できる硝酸イオン濃度は、亜硝酸イオン
の濃度に依存することが認められた。従つて、イ
ンヒビターである亜硝酸イオン濃度を定めておけ
ば、硝酸イオン濃度の許容限界値が定まり、硝酸
イオン濃度を測ることによつて、補給を要する亜
硝酸イオン量、バクテリアの活動状況を知り、装
置構成材料の腐食に対する循環条件の変化を監視
できる。 Furthermore, in the coexistence of nitrite ions and nitrate ions, we experimentally determined the areas where carbon steel would corrode and the areas where it would not corrode after 500 hours of immersion at 30°C, and the results were as shown in Figure 1. . From this result, it was recognized that the allowable nitrate ion concentration depends on the nitrite ion concentration. Therefore, by determining the concentration of nitrite ion, which is an inhibitor, the allowable limit value of nitrate ion concentration can be determined, and by measuring the nitrate ion concentration, it is possible to know the amount of nitrite ion that needs to be replenished and the status of bacterial activity. , changes in circulation conditions for corrosion of equipment constituent materials can be monitored.
ところで本発明者等は、溶液分析法などの所謂
化学分析法の場合には、得られる硝酸濃度の値
が、共存する亜硝酸イオンにより妨害を受けやす
いという点を考慮して、通常のAg−AgNO3電極
のような硝酸イオン電極を使用することを検討し
た。そこで、種々の濃度の亜硝酸塩溶液中におけ
る硝酸イオン濃度を知るために、硝酸イオン電極
がカロメル電極との間に示す電圧と硝酸イオン濃
度との関係を調べた。その結果、第２図に示すご
とく、硝酸イオン電極は共存する亜硝酸イオン濃
度に無関係（妨害されず）に、硝酸イオン濃度の
対数値に直線的に比例した電圧を示すことを確認
した。従つて、バクテリアによつて消費された亜
硝酸イオンの濃度は、硝酸イオン電極によつて硝
酸イオン濃度を測定し、かつバクテリアによる下
式(1)の反応式に基づき、計算により求めることが
できる。 By the way, the present inventors took into account that in the case of so-called chemical analysis methods such as solution analysis methods, the obtained nitric acid concentration value is likely to be interfered with by coexisting nitrite ions. We considered using a nitrate ion electrode such as an AgNO3 electrode. Therefore, in order to find out the nitrate ion concentration in nitrite solutions of various concentrations, we investigated the relationship between the voltage exhibited between the nitrate ion electrode and the calomel electrode and the nitrate ion concentration. As a result, as shown in FIG. 2, it was confirmed that the nitrate ion electrode exhibited a voltage linearly proportional to the logarithm of the nitrate ion concentration, regardless of the coexisting nitrite ion concentration (without interference). Therefore, the concentration of nitrite ions consumed by bacteria can be calculated by measuring the nitrate ion concentration with a nitrate ion electrode and based on the reaction equation (1) below by bacteria. .
NO2 -＋1/2O2→NO3 - (1)
そして、補給すべき亜硝酸イオン量は、前述に
より算出したバクテリアにより消費された亜硝酸
イオン量を考慮して、適宜決定するという方法を
見出したものである。 NO 2 - +1/2O 2 →NO 3 - (1) Then, we found a method in which the amount of nitrite ions to be replenished is determined appropriately by taking into account the amount of nitrite ions consumed by bacteria, which was calculated as described above. It is something that
本発明は、上記のような知見に基づいて、冷却
水中の硝酸イオン濃度を、電気化学的方法等によ
つて、常時、自動的に測定し、該測定値が予め設
定された値を越えたときに、薬液類注入装置を自
動的に作動させて、消費された亜硝酸塩および、
ニトロバクテリアに対して殺菌効果を示す例えば
アジ化ナトリウムなどの薬剤を注入することによ
つて、冷却水中のイオン濃度を、装置構成材料の
腐食しにくい範囲に保つことを可能にしたもので
ある。 Based on the above findings, the present invention constantly and automatically measures the nitrate ion concentration in cooling water using an electrochemical method or the like, and detects when the measured value exceeds a preset value. Sometimes, the drug infusion device is activated automatically to release the consumed nitrite and
By injecting a chemical such as sodium azide that has a bactericidal effect on nitrobacteria, it is possible to maintain the ion concentration in the cooling water within a range that does not easily corrode the equipment's constituent materials.
次に、実施例によつて説明する。 Next, an example will be explained.
第３図は、発電機廻り循環水型冷却装置の系統
図である。亜硝酸塩を含む冷却用水は、サージタ
ンク１に送入され、主循環ポンプ２の働きをかり
て系統内を循環する。該冷却水は、復水ポンプ
５、復水昇圧ポンプ６、給水ポンプ７、もしくは
タービン油冷却器８を通つて各機器から発生した
熱を吸収し、その吸収した熱を淡水冷却器４にお
いて放出したのち、再び各機器を冷却するために
循環する。 FIG. 3 is a system diagram of the circulating water type cooling device around the generator. Cooling water containing nitrite is sent to a surge tank 1 and circulated within the system by the action of a main circulation pump 2. The cooling water absorbs heat generated from each device through the condensate pump 5, condensate boost pump 6, feed water pump 7, or turbine oil cooler 8, and releases the absorbed heat in the fresh water cooler 4. After that, it is circulated again to cool each piece of equipment.
主循環ポンプ２の吐出側に、硝酸イオン電極と
カロメル電極とをそなえた硝酸イオン自動濃度検
出装置３が設置される。この装置３には制御装置
９が連結され、それには第１図に基づいて冷却水
が維持すべき硝酸イオン濃度範囲に応じた電圧値
が設定記憶されている。前記硝酸イオン検出装置
３からの出力電圧が制御装置における該設定電圧
値を越えると、制御装置９は自動的に薬注ポンプ
１０およびインヒビターポンプ１２を作動させ
て、薬注タンク１１およびインヒビタータンク１
３からそれぞれ、一定量の殺菌剤溶液および該出
力電圧に応じて設定された量の亜硝酸塩溶液を、
循環冷却水系に注入するよう構成されている。 A nitrate ion automatic concentration detection device 3 equipped with a nitrate ion electrode and a calomel electrode is installed on the discharge side of the main circulation pump 2. A control device 9 is connected to this device 3, and a voltage value corresponding to the nitrate ion concentration range to be maintained in the cooling water is set and stored in it based on FIG. When the output voltage from the nitrate ion detection device 3 exceeds the set voltage value in the control device, the control device 9 automatically operates the chemical injection pump 10 and the inhibitor pump 12, and the chemical injection tank 11 and the inhibitor tank 1.
3, respectively, a certain amount of disinfectant solution and an amount of nitrite solution set according to the output voltage,
The system is configured to be injected into a circulating cooling water system.
この装置のサージタンク１から、新たに調製し
た亜硝酸ナトリウム（亜硝酸イオン濃度的
200ppm）含有冷却水60tonを系統内に導入し、運
転したところ、次第に硝酸イオンが増加し始め、
８日後には設定した硝酸イオン濃度限界値
175ppmにまで達したので、薬注タポンプ１０が
作動して、系統内におけるアジ化ナトリウム濃度
が10ppmになるように、薬注タンク１１からアジ
化ナトリウム液（濃度1Mol／）9.23が冷却
水系に注入された。それと同時に、インヒビター
ポンプ１２によつて、インヒビタータンク１３か
ら亜硝酸ナトリウム溶液（濃度120ｇ／）65
が注入された。ここで、亜硝酸ナトリウム溶液は
次のようにしてその注入量を決定し、ポンプによ
り注入したものである。即ち、硝酸イオン電極に
よる測定で36ｍＶを検出したために、第２図から
硝酸イオンが175ppm生成していることが判る。
従つて、亜硝酸イオンのバクテリアによる消費量
は、前記(1)式に基づき、
46（NO2 -の分子量）／62（NO3 -の分子量）×175（NO3 -
の生成濃度）
＝130ppm（NO2 -の消費量）
と算出することができた。亜硝酸イオンは、当
初、200ppm注入しておいたので、残存亜硝酸イ
オン濃度は、200−130＝70（ppm）となる。従つ
て、次に注入すべき亜硝酸ナトリウム溶液（亜硝
酸イオン濃度120ｇ／）の量が消費した亜消酸
イオン濃度に相当する130ppmとなるようにポン
プ送量を決定したものである。 Freshly prepared sodium nitrite (nitrite ion concentration
When 60 tons of cooling water containing 200ppm) was introduced into the system and operated, nitrate ions gradually began to increase.
After 8 days, the set nitrate ion concentration limit value will be reached.
Since the concentration reached 175 ppm, the chemical injection pump 10 is activated and 9.23 sodium azide solution (concentration 1Mol/) is injected into the cooling water system from the chemical injection tank 11 so that the sodium azide concentration in the system becomes 10 ppm. It was done. At the same time, the inhibitor pump 12 pumps 65 sodium nitrite solution (concentration 120 g/) from the inhibitor tank 13.
was injected. Here, the injection amount of the sodium nitrite solution was determined as follows, and the solution was injected using a pump. That is, since 36 mV was detected in the measurement using the nitrate ion electrode, it can be seen from FIG. 2 that 175 ppm of nitrate ions were generated.
Therefore, the amount of nitrite ion consumed by bacteria is calculated as follows based on equation (1): 46 (molecular weight of NO 2 - )/62 (molecular weight of NO 3 - ) x 175 (molecular weight of NO 3 -).
(concentration of NO 2 - produced) = 130 ppm (consumption amount of NO 2 - ). Since nitrite ions were initially injected at 200 ppm, the residual nitrite ion concentration was 200-130=70 (ppm). Therefore, the pumping rate was determined so that the amount of sodium nitrite solution (nitrite ion concentration 120 g/) to be injected next would be 130 ppm, which corresponds to the consumed sulfite ion concentration.
注入量
＝0.13（ｇ／）×60000（）／120（ｇ／）
即ち、電圧が36ｍＶに達した時、ポンプにより
65の亜硝酸ナトリウム溶液を注入できるよう
に、予め設定しておいたものである。その結果、
第４図に示したように、それ以降硝酸イオンの増
加が停止し、一方では該系統内の亜硝酸イオン濃
度は速やかに原状を回復した。Injection amount = 0.13 (g/) x 60000 ()/120 (g/) That is, when the voltage reaches 36 mV, the pump
It was preset so that 65% of sodium nitrite solution could be injected. the result,
As shown in FIG. 4, the increase in nitrate ions stopped after that, while the nitrite ion concentration in the system quickly returned to its original state.
殺菌剤であるアジ化ナトリウムは、長い時間に
は亜硝酸イオンと反応して窒素とナトリウムイオ
ンとに分解し、殺菌作用は消失する。また、該冷
却水系統からの漏水や検査のための水抜きなどを
補うために、僅かではあるが循環水系統内に絶え
ず新たな冷却用水が加えられる。それ故、殺菌剤
注入後ある程度時間が経過すると、再びニトロバ
クテリアが活動し始めることがあるが、本発明に
おいてはそのような場合でも自動的に殺菌剤が注
入されて、その活動が阻止される。 Sodium azide, a bactericidal agent, reacts with nitrite ions and decomposes into nitrogen and sodium ions over a long period of time, and its bactericidal effect disappears. Furthermore, in order to compensate for water leakage from the cooling water system, water removal for inspection, etc., new cooling water is constantly added to the circulating water system, albeit in a small amount. Therefore, after a certain amount of time has passed after the disinfectant is injected, the nitro bacteria may start to become active again, but in the present invention, even in such cases, the disinfectant is automatically injected to prevent their activity. .
第２回目以降の亜硝酸塩の注入は、基本的には
第１回目と同じ要領によつて行なうことができ
る。第１回目と異なる点は硝酸イオンが既に
175ppm（第２図に基づく電圧値36ｍＶ）だけバク
テリア反応によつて生成、存在している点であ
る。そこで、第１図に基づいて硝酸イオンが
175ppm及び第２回目の注入の後にバクテリア反
応によつて生成する硝酸イオンの量を加算した硝
酸イオンの合計量を基に第２図からポンプ作動電
圧（36ｍＶより高い電圧）を決定し、かつ前記硝
酸イオンの合計量から第１図に基づいて防食効果
に有効な領域に入るように亜硝酸濃度を任意に選
択し、ポンプ送量を予めセツトしておく。第３回
目以降の注入も同じ要領で行う。なお、亜硝酸塩
の注入量は防食効果の点から言えば、より多量に
注入するのが好ましいが、実際には、液の粘性が
高くなり過ぎないようにするのがよい。 The second and subsequent nitrite injections can be performed basically in the same manner as the first injection. The difference from the first time is that nitrate ions are already present.
The point is that only 175 ppm (voltage value 36 mV based on Figure 2) is produced and exists through bacterial reactions. Therefore, based on Figure 1, nitrate ion
Determine the pump operating voltage (voltage higher than 36 mV) from Figure 2 based on the total amount of nitrate ions, which is 175 ppm plus the amount of nitrate ions produced by the bacterial reaction after the second injection, and Based on the total amount of nitrate ions, the nitrite concentration is arbitrarily selected based on FIG. 1 so that it falls within the range effective for corrosion prevention, and the pumping rate is set in advance. The third and subsequent injections are performed in the same manner. Although it is preferable to inject a larger amount of nitrite from the viewpoint of anti-corrosion effect, in reality it is better to prevent the viscosity of the liquid from becoming too high.
上記のようにして、本発明によれば、亜硝酸塩
をインヒビターとして含む冷却水を用いる循環型
冷却装置における構造材料の腐食を防止できる。 As described above, according to the present invention, corrosion of structural materials in a circulating cooling device using cooling water containing nitrite as an inhibitor can be prevented.
第１図は炭素鋼の腐食に関する亜硝酸イオンを
硝酸イオンの濃度の相関々係を、第２図は硝酸イ
オン濃度と硝酸イオン電極の出力との関係を示
す。また、第３図は本発明の動作原理を説明する
系統図であり、第４図は本発明の実施効果を示す
イオン濃度と時間の関係図である。
１……冷却水サージタンク、２……主循環ポン
プ、３……硝酸イオン検出装置、４……淡水冷却
器、５……復水ポンプ、６……復水昇圧ポンプ、
７……給水ポンプ、８……タービン油冷却器、９
……制御装置、１０……薬注ポンプ、１１……薬
注タンク、１２……インヒビター注入ポンプ、１
３……インヒビタータンク。
FIG. 1 shows the correlation between the concentrations of nitrite ions and nitrate ions regarding corrosion of carbon steel, and FIG. 2 shows the relationship between the nitrate ion concentration and the output of the nitrate ion electrode. Further, FIG. 3 is a system diagram explaining the operating principle of the present invention, and FIG. 4 is a diagram showing the relationship between ion concentration and time showing the effect of implementing the present invention. 1... Cooling water surge tank, 2... Main circulation pump, 3... Nitrate ion detection device, 4... Fresh water cooler, 5... Condensate pump, 6... Condensate boost pump,
7...Water pump, 8...Turbine oil cooler, 9
... Control device, 10 ... Chemical injection pump, 11 ... Chemical injection tank, 12 ... Inhibitor injection pump, 1
3...Inhibitor tank.
Claims (1)
おいて、硝酸イオン濃度自動検出装置および薬液
類自動注入装置を設置し、該冷却水中の硝酸イオ
ン濃度が予め設定された値を越えた際に殺菌剤お
よび亜硝酸塩を該水中に自動的に注入することに
よつて、硝酸イオン濃度を該設定値以下に維持す
ることを特徴とする循環水型冷却装置の腐食防止
法。1. In a cooling system that circulates water containing nitrite, an automatic nitrate ion concentration detection device and an automatic chemical injection device are installed, and when the nitrate ion concentration in the cooling water exceeds a preset value, disinfectant is released. and a method for preventing corrosion of a circulating water type cooling device, characterized in that the concentration of nitrate ions is maintained below the set value by automatically injecting nitrite into the water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7016980A JPS56166486A (en) | 1980-05-28 | 1980-05-28 | Corrosion prevention of water circulation type cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7016980A JPS56166486A (en) | 1980-05-28 | 1980-05-28 | Corrosion prevention of water circulation type cooler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56166486A JPS56166486A (en) | 1981-12-21 |
| JPS6363876B2 true JPS6363876B2 (en) | 1988-12-08 |
Family
ID=13423765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7016980A Granted JPS56166486A (en) | 1980-05-28 | 1980-05-28 | Corrosion prevention of water circulation type cooler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56166486A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03103745U (en) * | 1990-02-08 | 1991-10-28 |
-
1980
- 1980-05-28 JP JP7016980A patent/JPS56166486A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03103745U (en) * | 1990-02-08 | 1991-10-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56166486A (en) | 1981-12-21 |
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