CN203159714U - Subarea cathode protection system of water pipeline system for nuclear plant important plant - Google Patents
Subarea cathode protection system of water pipeline system for nuclear plant important plant Download PDFInfo
- Publication number
- CN203159714U CN203159714U CN 201320121894 CN201320121894U CN203159714U CN 203159714 U CN203159714 U CN 203159714U CN 201320121894 CN201320121894 CN 201320121894 CN 201320121894 U CN201320121894 U CN 201320121894U CN 203159714 U CN203159714 U CN 203159714U
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- Prior art keywords
- potentiostat
- pipeline section
- anode
- cathode terminal
- protection
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Abstract
The utility model relates to a subarea cathode protection system of a water pipeline system for a nuclear plant important plant. The subarea cathode protection system comprises a plurality of independent constant potential rectifiers, wherein each constant potential rectifier is provided with an anode terminal, a cathode terminal and a sampling signal input end, a water pipe is divided into two protection areas, namely, a main protection pipe section and a water inlet-outlet pipe section, both the main protection pipe section and the water inlet-outlet pipe section are respectively provided with auxiliary anodes, electrification points and reference electrodes, and the anode terminal, the cathode terminal and the sampling signal input end are respectively electrically connected with the corresponding auxiliary anode, the electrification point and the reference electrode. The important plant water pipeline system is divided into the main protection pipe section and the water inlet-outlet pipe section, and the two sets of independent constant potential rectifiers are adopted for controlling the output, so that the potential of the inlet-outlet protection pipe section is between minus 0.78V and minus 1.05V, the corrosion problem of the important plant water pipeline system can be solved, and the service life of the device is prolonged.
Description
Technical field
The utility model relates to a kind of nuclear power plant essential service water tubing system subregion cathodic protection system.
Background technology
Nuclear power plant's essential service water tubing system; pipe material is P265GH (RCCM M1145); under the effect of seawater, can produce serious corrosion; in order to guarantee acceptable life; save maintenance and overhead charges; GA gallery and nuclear island factory building shellfish trap SEC pipeline and nuclear island factory building overflow weir four the separate SEC pipeline materials before before that are laid in are P265GH (RCCM 2000+2002 addendum M1145), and inner-walls of duct need adopt the associating anti-corrosion measure of galvanic protection and anticorrosion coat.
Nuclear power plant's essential service water tubing system is subjected to the pipeline of galvanic protection part to be 3 grades of safety, 3 grades of standards, antidetonation lF class, quality guarantee Q2 level.The pipe interior medium is seawater, and temperature is 24.8 ℃～37.0 ℃, when operating pressure 0.60MPa, single pump operation, and single SEC pipeline minimum flow rate 3500m
3
/ h, corresponding flow velocity 2.52m/s; Peak flow 4000m
3
/ h, corresponding flow velocity 2.88m/s.During the double pump parallel running, single SEC pipeline minimum flow rate 4600m
3
/ h, corresponding flow velocity 3.31m/s; Peak flow 5200m
3
/ h, corresponding flow velocity 3.75m/s.The pipeline external environment condition is 0～40 ℃ of temperature, the saliferous air of relative humidity 100%.
System adopts the impressed current cathodic protection technology, and protection essential service water tubing system is avoided corrosion.
It is to lose electronics to be oxidized to Fe that carbon steel corrodes in seawater
2+
Dissolution process; corresponding corrosion potential is about-600 mV(with respect to the Ag/AgCl reference electrode; down together); pass through external dc power supply; protected metal is applied negative current; by cathodic polarization its electropotential is born and moved to-0.78 V～-1.05 V, thereby reach the purpose that suppresses metallic corrosion.It should be noted that the cathodic protection potential of protected hardware, is not that the more negative protection effect of current potential is more good, when the current potential of metal is defeated by a certain potential value (1.05 V), and H in the water
+
Beginning is in metallic surface absorption and be reduced into hydrogen atom, and evolving hydrogen reaction takes place, and liberation of hydrogen causes peeling off of coating easily, and severe patient causes the hydrogen embrittlement of material or hydrogen to cause stress corrosion crack.
Because protection pipeline import and export has been finished isolated flange and handled, but on-the-spot test is found out the galvanic protection pipeline and is linked to each other with the shellfish trap.This reason current potential of causing importing and exporting the protection pipeline section can't enter " 0.78V～-1.05V " interval just.
On the other hand, the essential service water tubing system is used at sea water system more than 40 years life, has corrosion phenomenon when not having galvanic protection, influences service life of equipment.Adopt existing cathode protection technology, in the equipment initial launch stage, solved equipment galvanic corrosion problem.But along with prolonging working time, cause the current potential imbalance at each position of essential service water pipeline, the special protection that 1 protection subregion can't the intake-outlet pipeline section changes and causes the total output current fluctuation of potentiostat thereby cause local reference electrode to measure current potential.When output during big electric current, the localised protection current potential is negative excessively, thereby forms evolving hydrogen reaction, and evolving hydrogen reaction causes the coating bubbling, and bubbling is not in time repaired, when outward current hour, the localised protection current potential excessively just can't obtain the excellent protection effect.
Summary of the invention
The purpose of this utility model provides a kind of tubing system subregion cathodic protection system that can effectively solve nuclear power plant's essential service water pipeline intake-outlet etching problem.
For achieving the above object; the technical solution adopted in the utility model is: nuclear power plant's essential service water tubing system subregion cathodic protection system comprises the potentiostat of many platform independent; every described potentiostat has anode terminal; cathode terminal and sampled signal input terminus; described water pipe is divided into two protection zones; be respectively the main protection pipeline section; the Inlet and outlet water pipeline section; described main protection pipeline section and Inlet and outlet water pipeline section are provided with supplementary anode; energising point and reference electrode; described anode terminal; cathode terminal and sampled signal input terminus respectively with corresponding supplementary anode; the energising point; be electrically connected with reference electrode; a plurality of described potentiostats are divided into two groups respectively to the main protection pipeline section; the Inlet and outlet water pipeline section is protected, and the current potential of import and export protection pipeline section is entered-0.78V～-the 1.05V interval.
Optimize; described potentiostat has two to be respectively first potentiostat, second potentiostat; the anode terminal of described first potentiostat, cathode terminal and sampled signal input terminus are corresponding with supplementary anode, energising point and the reference electrode of main protection pipeline section, and the anode terminal of described second potentiostat, cathode terminal and sampled signal input terminus are corresponding with supplementary anode, energising point and the reference electrode of Inlet and outlet water pipeline section.
Further, the energising point corresponding with the cathode terminal of described first potentiostat is first group of energising point, the energising point corresponding with the cathode terminal of described second potentiostat is second group of energising point, and all described supplementary anodes are distributed between two groups of described energising points regularly.
Further, the described first potentiostat cathode terminal has three, and the cathode terminal of described second potentiostat has one.
Because technique scheme is used; the utility model compared with prior art has following advantage: the utility model just essential service water tubing system is divided into main protection pipeline section and two zones of Inlet and outlet water pipeline section; adopt independently potentiostat to control output respectively; the current potential of import and export protection pipeline section is entered " 0.78V～-1.05V " interval; solve the etching problem of essential service water tubing system, prolonged service life of equipment.
Description of drawings
Accompanying drawing 1 is the structural representation of this nuclear power plant essential service water tubing system subregion cathodic protection system;
In the accompanying drawing: 1, first potentiostat; 2, second potentiostat; 1 ', main protection pipeline section; 2 ', Inlet and outlet water pipeline section; 11(21), cathode terminal; 12(22), anode terminal; 12 ' (22 '), supplementary anode; 11 ' (21 '), energising point; 13(23) reference electrode.
Embodiment
Be further described below in conjunction with the utility model of embodiment shown in the drawings.
As shown in Figure 1, in the present embodiment, this nuclear power plant's essential service water tubing system subregion cathodic protection system comprises the potentiostat of two platform independent, and every described potentiostat has anode terminal, cathode terminal and sampled signal input terminus.Two described potentiostats are respectively first potentiostat 1 and second potentiostat 2.The cathode terminal 11 of first potentiostat 1 has three, and anode terminal 12 has six, and it is how right that reference electrode 13 has, and six anode terminals 12 are divided into first group of anode, second group of anode, the 3rd group of anode, connect a plurality of MMO anodes on every group of anode again.The cathode terminal 21 of second potentiostat 2 has one, and anode terminal 22 has one, and reference electrode 23 has a pair of, also is connected with a plurality of anodes on its anode terminal 22.The MMO anode can be regulated as the case may be.
Described main protection pipeline section 1 ' and Inlet and outlet water pipeline section 2 ' are provided with supplementary anode, energising point and reference electrode.Supplementary anode 12 ' the number of described main protection pipeline section 1 ' is identical with the number of MMO anode and connect one to one, and its energising point 11 ' has three and be connected with three negative electrodes 11 of first potentiostat 1 respectively.The supplementary anode 22 ' of Inlet and outlet water pipeline section 2 ' have a plurality of and respectively with the anode terminal 22 of second potentiostat 2 on a plurality of MMO anodes connect one to one, its energising point 21 ' has one and be connected with the cathode terminal 21 of described second potentiostat 2.All described supplementary anodes are distributed between two groups of described energising points regularly.
Two potentiostats are adjusted its outward current size according to the electric potential signal of corresponding reference electrode feedback and in conjunction with default potential value; two potentiostats are respectively to main protection pipeline section 1 ' and Inlet and outlet water pipeline section 2 ' external dc power supply; namely protected main protection pipeline section 1 ' and Inlet and outlet water pipeline section 2 ' are applied negative current; make negative-0.78 V～-1.05 V that move to of electropotential of main protection pipeline section 1 ' and Inlet and outlet water pipeline section 2 ' by cathodic polarization; thereby reach the purpose that suppresses metallic corrosion; solve the etching problem of essential service water tubing system, prolonged service life of equipment.
Above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model spirit change or modify, and all should be encompassed within the protection domain of the present utility model.
Claims (4)
1. nuclear power plant's essential service water tubing system subregion cathodic protection system; it is characterized in that: it comprises the potentiostat of many platform independent; every described potentiostat has anode terminal; cathode terminal and sampled signal input terminus; described water pipe is divided into two protection zones; be respectively the main protection pipeline section; the Inlet and outlet water pipeline section; described main protection pipeline section and Inlet and outlet water pipeline section are provided with supplementary anode; energising point and reference electrode; described anode terminal; cathode terminal and sampled signal input terminus respectively with corresponding supplementary anode; the energising point; be electrically connected with reference electrode; many described potentiostats are divided into two groups; respectively to the main protection pipeline section; the Inlet and outlet water pipeline section is protected, and the current potential of import and export protection pipeline section is entered-0.78V～-the 1.05V interval.
2. nuclear power plant according to claim 1 essential service water tubing system subregion cathodic protection system; it is characterized in that: described potentiostat has two to be respectively first potentiostat, second potentiostat; the anode terminal of described first potentiostat, cathode terminal and sampled signal input terminus are corresponding with supplementary anode, energising point and the reference electrode of main protection pipeline section, and the anode terminal of described second potentiostat, cathode terminal and sampled signal input terminus are corresponding with supplementary anode, energising point and the reference electrode of Inlet and outlet water pipeline section.
3. nuclear power plant according to claim 2 essential service water tubing system subregion cathodic protection system; it is characterized in that: the energising point corresponding with the cathode terminal of described first potentiostat is first group of energising point; the energising point corresponding with the cathode terminal of described second potentiostat is second group of energising point, and all described supplementary anodes are distributed between two groups of described energising points regularly.
4. nuclear power plant according to claim 3 essential service water tubing system subregion cathodic protection system, it is characterized in that: the described first potentiostat cathode terminal has three, and the cathode terminal of described second potentiostat has one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121894 CN203159714U (en) | 2013-03-18 | 2013-03-18 | Subarea cathode protection system of water pipeline system for nuclear plant important plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121894 CN203159714U (en) | 2013-03-18 | 2013-03-18 | Subarea cathode protection system of water pipeline system for nuclear plant important plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203159714U true CN203159714U (en) | 2013-08-28 |
Family
ID=49020913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320121894 Expired - Lifetime CN203159714U (en) | 2013-03-18 | 2013-03-18 | Subarea cathode protection system of water pipeline system for nuclear plant important plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203159714U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242556A (en) * | 2014-09-24 | 2014-12-24 | 张家港市恒强冷却设备有限公司 | Air cooler for nuclear power steam turbine generators |
| CN108823575A (en) * | 2018-08-22 | 2018-11-16 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Collecting well group cathodic protection direct current distributor and production method and guard method |
-
2013
- 2013-03-18 CN CN 201320121894 patent/CN203159714U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242556A (en) * | 2014-09-24 | 2014-12-24 | 张家港市恒强冷却设备有限公司 | Air cooler for nuclear power steam turbine generators |
| CN104242556B (en) * | 2014-09-24 | 2017-04-19 | 张家港市恒强冷却设备有限公司 | Air cooler for nuclear power steam turbine generators |
| CN108823575A (en) * | 2018-08-22 | 2018-11-16 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Collecting well group cathodic protection direct current distributor and production method and guard method |
| CN108823575B (en) * | 2018-08-22 | 2023-08-18 | 中国石油天然气集团有限公司 | Cluster well cathode protection direct current distribution device, manufacturing method and protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215004 West Ring Road, Jiangsu, Suzhou, No. 1788 Patentee after: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Patentee after: CHINA GENERAL NUCLEAR POWER Corp. Patentee after: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Address before: 215004 West Ring Road, Jiangsu, Suzhou, No. 1788 Patentee before: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Patentee before: CHINA GUANGDONG NUCLEAR POWER GROUP Co.,Ltd. Patentee before: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151116 Address after: 518031 Guangdong province Futian District Shangbu Road West of the city of Shenzhen Shenzhen science and technology building, 15 Floor Patentee after: LING'AO NUCLEAR POWER Co.,Ltd. Patentee after: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Patentee after: CHINA GENERAL NUCLEAR POWER Corp. Patentee after: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. Address before: 215004 West Ring Road, Jiangsu, Suzhou, No. 1788 Patentee before: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Patentee before: CHINA GENERAL NUCLEAR POWER Corp. Patentee before: CHINA NUCLEAR POWER ENGINEERING Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
|
| CX01 | Expiry of patent term |