JPH0293085A - Electric corrosion protection device for heat exchanger - Google Patents
Electric corrosion protection device for heat exchangerInfo
- Publication number
- JPH0293085A JPH0293085A JP63243856A JP24385688A JPH0293085A JP H0293085 A JPH0293085 A JP H0293085A JP 63243856 A JP63243856 A JP 63243856A JP 24385688 A JP24385688 A JP 24385688A JP H0293085 A JPH0293085 A JP H0293085A
- Authority
- JP
- Japan
- Prior art keywords
- potential
- heat exchanger
- water chamber
- corrosion protection
- electrode
- 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
- 238000005260 corrosion Methods 0.000 title claims abstract description 32
- 230000007797 corrosion Effects 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000010936 titanium Substances 0.000 claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000013535 sea water Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 7
- 239000001257 hydrogen Substances 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000004210 cathodic protection Methods 0.000 claims description 15
- 239000003507 refrigerant Substances 0.000 claims description 2
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 10
- 239000010962 carbon steel Substances 0.000 abstract description 10
- 239000000498 cooling water Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は伝熱管および管板にチタン材を利用する熱交換
器を有する熱交換装置の電気防食装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cathodic protection device for a heat exchange device having a heat exchanger using titanium material for heat transfer tubes and tube sheets.
（従来の技術）
発電プラントの多くの熱交換器の一部（伝熱管およびＩ
ｒｆ板）には、海水に対する耐食性に優れているチタン
材が使用されている。一方、熱交換器水室および配管に
は、一般に、炭素鋼が使用されているが、耐食性を増す
ために内面にはライニング（例えばタールエポキシライ
ニング）が施こされている。(Prior art) Some of the many heat exchangers in power plants (heat exchanger tubes and I
The RF board is made of titanium, which has excellent corrosion resistance against seawater. On the other hand, carbon steel is generally used for the heat exchanger water chamber and piping, but the inner surface is lined (for example, tar epoxy lining) to increase corrosion resistance.
従来、この種の熱交換装置は第２図に示すように、ポン
プ１で昇圧された海水は配管２を通って水室３に至る。Conventionally, in this type of heat exchange device, as shown in FIG. 2, seawater pressurized by a pump 1 passes through a pipe 2 and reaches a water chamber 3.
そして、水室３より伝熱管４を通るときに胴５の内部を
通過する流体と熱交換を行なう。熱交換を行なった海水
は水室６から配管７に導かれて、放水底８に至る。なお
、符号９はライニングを示している。Then, when passing from the water chamber 3 through the heat transfer tube 4, heat exchange is performed with the fluid passing through the inside of the shell 5. The seawater that has undergone heat exchange is led from the water chamber 6 to the piping 7 and reaches the water discharge bottom 8. In addition, the code|symbol 9 has shown the lining.
一般に、炭素鋼の自然電位はチタンの自然電位より低い
ことが知られているが、従来の熱交換装置における配＋
１？２および水室３のライニング９に損傷が発生した場
合、卑金属である炭素鋼と貴金属であるチタン間にガル
バニック腐食が発生する可能性がある。このため、通常
炭素鋼配管内部に電気防食装置１０を設置して、炭素鋼
の防食を行なっている。すなわち、電気防食装置１０は
外部電源式の場合、防食用電極１１と照合用電極１２と
、制御器１３から構成され１図に示されるように配管２
を対象として設置されろ。なお１図には省略されている
が、配Ｉ′ｉ′？７にも同様な装置が用いられる。It is generally known that the natural potential of carbon steel is lower than that of titanium, but the
If damage occurs to the linings 9 of 1 and 2 and the water chamber 3, galvanic corrosion may occur between carbon steel, which is a base metal, and titanium, which is a noble metal. For this reason, a cathodic protection device 10 is usually installed inside the carbon steel piping to protect the carbon steel from corrosion. That is, when the cathodic protection device 10 is an external power supply type, it is composed of a corrosion protection electrode 11, a reference electrode 12, and a controller 13, and as shown in FIG.
be set up as a target. Although omitted in Figure 1, the arrangement I'i'? A similar device is used in 7.
（発明が解決しようとする課題）
炭素鋼の自然電位は一４６０ｍＶ −−７２０ｍＶ Ｓ
ＣＥ（飽和１］こう電位）であるため、防食電位は一
７２０ｍＶＳＣＥ以下（一般には一１１０ｍ Ｖ以下）
に設定されろ。゛１１工気防食装首ｌＯの場合には、防
食用電極ＩＩの近傍に照合電極１２を設置することによ
って、防食電位を一定に制御している。(Problem to be solved by the invention) The natural potential of carbon steel is -460 mV - -720 mV S
CE (saturation 1] potential), so the corrosion protection potential is -720mVSCE or less (generally -1110mV or less)
Be set to . In the case of the 11-engine anti-corrosion head lO, the anti-corrosion potential is controlled to be constant by installing a reference electrode 12 near the anti-corrosion electrode II.
一方、チタンの自然電位は一１５０ｍＶ〜＋５０ｍＶＳ
ＣＥであるが、 −６００ｍＶ Ｓ ＣＥ以下の電位
になった場合には水素脆化が発生することが知られてい
る。On the other hand, the natural potential of titanium is -150mV to +50mVS
However, it is known that hydrogen embrittlement occurs when the potential is -600 mV S CE or lower.
このため、第３図に示すような電位分布になるように、
電気防食装置１０を制御しなければならない。すなわち
、炭素鋼の防食電位としては一７７０ｍＶｓｃＥ以下に
することが望ましいが、チタン材の近傍では一６００ｍ
Ｖ ＳＣＥ以上に電位を保たなければならないという制
約が生じる。Therefore, so that the potential distribution is as shown in Figure 3,
The cathodic protection device 10 must be controlled. In other words, it is desirable that the anti-corrosion potential of carbon steel is -770mVscE or less, but in the vicinity of titanium material, it is desirable to keep it below -1600mVscE.
There is a restriction that the potential must be maintained at a level higher than VSCE.
しかし、適正な防食状態を保つために必要な電流値は、
炭素鋼表面の汚れ、配管２，７内の海水の流速あるいは
海水温度など種々の要因により影響を受けるため、常時
適正な防食状態を保つことは非常に困難である。However, the current value required to maintain proper corrosion protection is
It is extremely difficult to maintain an appropriate anti-corrosion state at all times because it is affected by various factors such as dirt on the surface of the carbon steel, the flow rate of seawater in the pipes 2 and 7, and the temperature of the seawater.
本発明は、上記の点に鑑みてなされたものであり、配管
と水室内とを適正な防食電位に保つことができる熱交換
装置の電気防食装置を提供することを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide an electrolytic protection device for a heat exchange device that can maintain an appropriate corrosion protection potential between piping and a water chamber.
（課題を解決するための手段）
本発明による電気防食装置は海洋からの海水を導く鋼材
からなる配管と、海水を冷媒として用い、かつチタン材
からなる伝熱管および管板を用いた熱交換器を有する熱
交換装置において、配管および熱交換器の水室の双方に
電気防食用電極を設置して、配管内では鋼材の防食電位
を、また水室内ではチタン材の水素脆化を防止可能な防
、食電位をそれぞれ保持するように電気防食装置を制御
することを特徴とする。(Means for Solving the Problems) The cathodic protection device according to the present invention includes piping made of steel that guides seawater from the ocean, and a heat exchanger that uses seawater as a refrigerant and uses heat transfer tubes and tube sheets made of titanium. In the heat exchange equipment, cathodic protection electrodes are installed in both the piping and the water chamber of the heat exchanger to prevent the corrosion potential of the steel material in the piping and the hydrogen embrittlement of the titanium material in the water chamber. It is characterized in that the cathodic protection device is controlled so as to maintain corrosion protection and corrosion potential.
（作用）
本発明は配管および水室内の双方に電気防食装置を設置
して、各々の電極からの電流の出入りによって防食電位
を制御する。(Function) In the present invention, a cathodic protection device is installed both in the piping and in the water chamber, and the corrosion protection potential is controlled by the flow of current into and out of each electrode.
（実施例）
本発明の実施例を示す第１図において、配管２の内面に
防食用電極１１が設置されている。防食用電極１１の近
傍には照合電極１２が設置されており、配管２内の電位
が炭素鋼の自然電位より卑になるように、制御器１３に
より制御を行なう。また、熱交換器の水室３に電気防食
装置１４が設けられろ。(Example) In FIG. 1 showing an example of the present invention, an anti-corrosion electrode 11 is installed on the inner surface of a pipe 2. A reference electrode 12 is installed near the anti-corrosion electrode 11, and is controlled by a controller 13 so that the potential inside the pipe 2 is less noble than the natural potential of carbon steel. Further, a cathodic protection device 14 is provided in the water chamber 3 of the heat exchanger.
防食用電極Ｉ５は水室３の熱交換器の管板から離した位
置に照合電極１６は管板の近くにそれぞれ配置されろ。The anti-corrosion electrode I5 is placed at a position away from the tube sheet of the heat exchanger in the water chamber 3, and the reference electrode 16 is placed near the tube sheet.
この照合電極１６により、管板近傍の電位がチタン水素
脆化電位より貴になるように制御器１７を用いて制御を
行なう。Using this reference electrode 16, control is performed using a controller 17 so that the potential near the tube sheet becomes nobler than the titanium-hydrogen embrittlement potential.
配管２内および熱交換器水室３内における電位分布は防
食用電極の位置によって影響をうけるため、照合電極１
２と制御器１３によって制Ｗを行なう防食電位は熱交換
器水室３人口の電位が約−７７０ｍＶＳＣＥになるよう
に予め設定しておく。Since the potential distribution inside the piping 2 and inside the heat exchanger water chamber 3 is affected by the position of the anti-corrosion electrode, the reference electrode 1
The anticorrosion potential controlled by the controller 13 and the heat exchanger water chamber 3 is set in advance so that the potential of the heat exchanger water chamber 3 is about -770 mVSCE.
また、水室３の内部に設置された防食用電極１５は照合
電極１６での電位が一６００ｍＶ ＳＣＥ以Ｉ−になる
ように設定しておく。Further, the anticorrosion electrode 15 installed inside the water chamber 3 is set so that the potential at the reference electrode 16 is less than 1600 mV SCE or more than I-.
以−１−のように本発明によれば、配管のガルバニック
腐食を防止することができ、かつ、熱交換器に使用され
ているチタン材の水素脆化を防止することができるため
、信頼性に優れている電気防食装置を提供することがで
きろ。As described in -1- below, according to the present invention, galvanic corrosion of piping can be prevented and hydrogen embrittlement of titanium materials used in heat exchangers can be prevented, so reliability can be improved. We can provide superior cathodic protection equipment.
第１図は本発明による熱交換装置の電気防食装置を示す
構成図、第２図は従来の熱交換装置に適用されろ電気防
食装置を示す構成図、第３図は熱交換装置各部の防食電
位の分布状態を示す特性図である。
２゜
・・配管
６・・・水室
９・・・ライニング
１１゜
１５・・防食用電極
１２゜
１６・・・照合用電極
１３゜
１７・・制御器Fig. 1 is a block diagram showing a cathodic protection device for a heat exchange device according to the present invention, Fig. 2 is a block diagram showing a cathodic protection device applied to a conventional heat exchange device, and Fig. 3 is a block diagram showing corrosion protection of various parts of the heat exchange device. FIG. 3 is a characteristic diagram showing a potential distribution state. 2゜...Piping 6...Water chamber 9...Lining 11゜15...Anti-corrosion electrode 12゜16...Verification electrode 13゜17...Controller
Claims (1)
として用い、かつチタン材からなる伝熱管および管板を
用いた熱交換器を有する熱交換装置において、前記配管
および熱交換器の水室の双方に電気防食用電極を設置し
て、該配管内では鋼材の防食電位を、また前記水室内で
はチタン材の水素脆化を防止可能な防食電位をそれぞれ
保持するように電気防食装置を制御することを特徴とす
る熱交換装置の電気防食装置。In a heat exchange device having piping made of steel that guides seawater from the ocean, and a heat exchanger that uses seawater as a refrigerant and uses heat transfer tubes and tube sheets made of titanium, the piping and the water chamber of the heat exchanger A cathodic protection electrode is installed in both of the pipes, and the cathodic protection device is controlled so as to maintain the corrosion protection potential of the steel material in the pipe and the corrosion protection potential capable of preventing hydrogen embrittlement of the titanium material in the water chamber. A cathodic protection device for a heat exchange device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63243856A JPH0293085A (en) | 1988-09-30 | 1988-09-30 | Electric corrosion protection device for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63243856A JPH0293085A (en) | 1988-09-30 | 1988-09-30 | Electric corrosion protection device for heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0293085A true JPH0293085A (en) | 1990-04-03 |
Family
ID=17109979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63243856A Pending JPH0293085A (en) | 1988-09-30 | 1988-09-30 | Electric corrosion protection device for heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0293085A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5698118A (en) * | 1996-03-29 | 1997-12-16 | Mitsubishi Denki Kabushiki Kaisha | Flash welding apparatus |
| JP2010106338A (en) * | 2008-10-31 | 2010-05-13 | Tokyo Institute Of Technology | Method and apparatus for measuring current of electrode in conductive liquid |
| GB2474084A (en) * | 2009-10-13 | 2011-04-06 | Aish Technologies Ltd | Impressed current cathodic protection (ICCP) |
-
1988
- 1988-09-30 JP JP63243856A patent/JPH0293085A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5698118A (en) * | 1996-03-29 | 1997-12-16 | Mitsubishi Denki Kabushiki Kaisha | Flash welding apparatus |
| JP2010106338A (en) * | 2008-10-31 | 2010-05-13 | Tokyo Institute Of Technology | Method and apparatus for measuring current of electrode in conductive liquid |
| GB2474084A (en) * | 2009-10-13 | 2011-04-06 | Aish Technologies Ltd | Impressed current cathodic protection (ICCP) |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6511586B1 (en) | Marine organism prevention system for structures in seawater | |
| Aljamali et al. | Review on corrosion and rust inhibition of machines in chemical engineering field | |
| JPH0293085A (en) | Electric corrosion protection device for heat exchanger | |
| JP4028169B2 (en) | Antifouling equipment for structures and heat exchangers in contact with seawater | |
| KR20120093617A (en) | Corrosion inhibition type steel tank | |
| EP0231178B1 (en) | Corrosion protection for heat exchangers | |
| JP3011531B2 (en) | Cathodic protection of heat exchanger | |
| JP2007085599A (en) | Heat exchanger | |
| JP2941543B2 (en) | Cathodic protection of heat exchanger | |
| CN203286921U (en) | Heat exchange system with high-chlorine water as heat-transfer medium | |
| JPH0694383A (en) | Double tube type sea-water introduction tube for sea-water heat exchanger | |
| CN217540120U (en) | Corrosion-resistant pert ground heating coil | |
| KR920004508B1 (en) | Apparatus and method for electrical anti-corrosion of total titanium heat exchanger | |
| CN212156100U (en) | Anti-corrosion heat-insulation pipeline | |
| Nikolakakos | COOLING WATER SYSTEM COMPONENTS- PART I CORROSION AND CORROSION PROTECTION METHODS | |
| JPS6350620Y2 (en) | ||
| JPS6131897A (en) | Heat exchange pipe with inner surface coating excellent in resistance to inflation of coating film | |
| JP4672895B2 (en) | Power supply system for cathodic protection | |
| Stetler | ACCELERATING LEAK RATE YIELDS TO CATHODIC PROTECTION--DUCTILE CAST IRON WATER MAINS | |
| JPH01184290A (en) | Corrosion preventive device for circulating water system using sea water | |
| JPH08338695A (en) | Iron ion injection device in heat exchanger | |
| JP2004339782A (en) | Anti-fouling device of structure | |
| JPS63313B2 (en) | ||
| KR20000000726A (en) | Controlling method for galvanic corrosion of pipe for sea water | |
| JPS63267894A (en) | Heat exchanger |