CN108080333A - A kind of valve cooling system screening electrodes on-line cleaning method - Google Patents
A kind of valve cooling system screening electrodes on-line cleaning method Download PDFInfo
- Publication number
- CN108080333A CN108080333A CN201810014493.2A CN201810014493A CN108080333A CN 108080333 A CN108080333 A CN 108080333A CN 201810014493 A CN201810014493 A CN 201810014493A CN 108080333 A CN108080333 A CN 108080333A
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- Prior art keywords
- screening electrodes
- cooling system
- cleaning solution
- valve
- cleaning
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a kind of valve cooling system screening electrodes on-line cleaning methods, and including adding cleaning solution into converter valve inner cold water by cooling water replenishment case, the pH for controlling inner cold water is 6.8 7.2, and electrical conductivity is less than 0.5 μ S/cm；Cleaning solution is in cyclic process, and by the way that chelatropic reaction, dissolving, stripping electrode surface deposits occurs with the deposit of screening electrodes surfaces of aluminum, the complex compound for reacting generation flows through interception removal after system filters, realizes the cleaning of electrode.This method can exempt artificial clearing electrode surface deposits, and converter valve is enable to run steadily in the long term, safety benefit and remarkable in economical benefits.
Description
Technical field
The present invention relates to converter valve cooling water channel water treatment field, more particularly to a kind of valve cooling system screening electrodes are clear online
Washing method.
Background technology
Valve cooling system is most important auxiliary system in DC transmission system, and valve cooling system failure can cause change of current valve components
It radiates bad, element over-temperature is caused to be burnt, seriously affect equipment safety and system stable operation.Converter valve cooling water channel is by valve tower
Thyristor cooling fin, water-cooled resistance, the water cooling reactor of interior each different potentials connect, between the metalwork of different potentials
Water route be possible to generate Faradaic current, these metalworks may be subject to electrolytic etching.Therefore, to avoid the electricity of metalwork
Solution corrosion, screening electrodes be installed in its valve section parallel connection water route into and out of collecting pipe and other corresponding positions, make the current potential in water route
Will be consistent with the current potential of thyristor, Faradaic current can be leaked from screening electrodes.
After high voltage direct current transmission converter valve long-play, the screening electrodes surface meeting installed on converter valve inner cold water pipeline
There is deposit, deposit ingredient is mainly β aluminium hydroxides, and laboratory acid, alkali are difficult dissolving.Deposit can reduce the work of electrode
Make area, cause the metal electrical equipment contacted with inner cold water that serious electrolytic etching and electrical flashover occurs, and deposit is in valve
It easily comes off under tower vibrations and inner cold water disturbance and blocks water route, device of overheating of electrical is caused to damage, influences power grid normal operation, most
Ten hundreds of economic losses can be caused eventually.
During live clearing electrode deposit, it is found that manual scale removal is easier, be most difficult to the fouling of removal（Collecting pipe
Import and export flange）It can also be removed by instrument.So it is at present manually logical for the processing method of screening electrodes deposit
Cross the methods of wiping, breaking into pieces removal electrode surface deposit.Removal electrode deposition object is not only time-consuming and laborious by hand, and effect differs,
And scale removal process must make change of current valve system stop transport, and cause the loss of huge financial cost.To solve the above problems, it seeks
The valve cooling system screening electrodes cleaning method of high-efficiency and economic is asked to have become domestic and international important research of technique direction at present.
The content of the invention
The present invention provides a kind of valve cooling system screening electrodes on-line cleaning methods, can normally be transported not influencing valve cooling system
In the case of row, on-line cleaning is carried out to screening electrodes, reaches electrode surface non-scaling, the effect of no adventitious deposit, so as to ensure
Run to system lasting stability.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of valve cooling system screening electrodes on-line cleaning method, comprises the following steps：By cooling water replenishment case into converter valve
Cleaning solution is added in cold water, while monitors the variation of inner cold water electrical conductivity, adjusts the injection rate of cleaning solution, pH is in 6.8- for control
In the range of 7.2, electrical conductivity is less than 0.5 μ S/cm；Cleaning solution passes through the deposition with screening electrodes surfaces of aluminum in cyclic process
Chelatropic reaction occurs for object, dissolving, stripping electrode surface deposits, and the complex compound for reacting generation is flowed through to intercept after system filters and gone
It removes, realizes the cleaning of electrode.
Further improve of the invention is that by mass percentage, cleaning solution component is as follows：0.5~1% 1,2- bis-
Methyl -3- hydroxyl -4- pyridones, 0.5~1% phytic acid, 0.5~1% maleic acid-acrylic acid copolymer, 0.1~0.5%
Ammonium carbonate, remaining component be water.
Further improve of the invention is that the content of ammonium carbonate is adjusting cleaning solution to neutrality in cleaning solution.
In the cleaning solution, 1,2-Dimethyl-3-hydroxypyrid-4-one is a kind of efficient chelate aluminum ion mixture, simultaneously
It is stabilized under valve cooling system running environment, and does not influence system pH and conductance, be the main component of cleaning solution.
In the cleaning solution, phytic acid, maleic acid-acrylic acid copolymer are chelate aluminum ion mixture.Phytic acid easily with aluminium ion knot
It closes, chemisorbed occurs in metal surface, form the unimolecule protective film of firm compact in matallic surface layer, inhibit the corruption of metal
Erosion, and its cheap, easily biological-degradable.Maleic acid-acrylic acid copolymer is also efficient chelate aluminum ion mixture, and and phytic acid
With excellent synergistic effect when collective effect and aluminium.
A kind of valve cooling system screening electrodes on-line cleaning method provided in the present invention has the following advantages：
On-line cleaning can be carried out to screening electrodes, reach electrode surface and do not tie in the case where not influencing valve cooling system normal operation
Dirt, the effect of no adventitious deposit, meanwhile, exempt artificial clearing electrode surface deposits, converter valve is enable to run steadily in the long term, pacify
Full benefit and remarkable in economical benefits.
Specific embodiment
Below by specific embodiment, technical scheme is described in further detail.
In the present invention, if not refering in particular to, used raw material and equipment etc. are commercially available or commonly used in the art.
Method in following embodiments is the conventional method of this field unless otherwise instructed.
The present invention is cleaned below for screening electrodes in existing high voltage direct current transmission converter valve cooling system.
Valve cooling system water supply tank etc. is all conventional technology, and therefore not to repeat here by the present invention.
Embodiment 1：
（1）, prepare cleaning solution
1,2- dimethyl -3- hydroxyl -4- the pyridones of addition clear water weight 0.8%, 0.5% into the 500L clear water of cleaning water tank
Phytic acid, 0.5% maleic acid-acrylic acid copolymer, it is 6.8-7.2 to add in appropriate ammonium carbonate and adjust pH value of solution, is cleaned
Liquid；
（2）, at a slow speed into medicine
The cleaning solution configured is added in into water supply tank, opens small pump, it is 1 ton hour to control cleaning flow, is paid attention to cold in monitoring
The variation of water conductivity adjusts the injection rate of water supply tank cleaning solution in time, and pH is in the range of 6.8-7.2 for control, and electrical conductivity is small
In 0.5 μ S/cm；
（3）, medicament reaction
After squeezing into cleaning solution, cleaning solution is in cyclic process, by the way that chelatropic reaction occurs with the deposit of screening electrodes surfaces of aluminum,
Dissolving, stripping electrode surface deposits, the complex compound for reacting generation flow through interception removal after system filters, realize the clear of electrode
It washes；
Embodiment 2：
Cleaning solution is housed in water tank（1% 1,2- dimethyl -3- hydroxyl -4- pyridones, 0.8% phytic acid, 0.8% Malaysia
Acid-acrylic copolymer, it is 6.8-7.2 to add in appropriate ammonium carbonate and adjust pH value of solution）, cleaning solution is injected by ion by metering pump
Bypass is exchanged, and then flows into cooling water recirculation system, the electrical conductivity of inner cold water in cooling water recirculation system is controlled to be not more than 0.5 μ
S/cm.With the cycling of cleaning solution, valve cooling system precision strainer, gap is 3~50 μm between strainer, can effectively remove cleaning solution
The complex compound formed with electrode dirt reaction, achievees the purpose that electrode clean.According to field experiment, the result shows that, the method can remove
The dirt on screening electrodes surface more than 80% has good experiment effect.
Comparative example 3（Conventional manual sweep-out method）
Conventional screening electrodes scale removal repair process is：Water-cooling system valve tower Inlet and outlet water valve → draining → of stopping transport → close removes
Dirt：Dismounting, scale removal reassemble → water filling → leak detection → experiment → multiple fortune.
By comparative example, the method for conventional manual removal screening electrodes surface deposits must make system shutdown,
And the waste for for 2-3 days, causing human resources is taken, also compromise huge production interests.And one kind provided by the invention
Valve cooling system screening electrodes on-line cleaning method, shortens scavenging period, reduces labor intensity, safe.Particularly can
Enough in the case where not influencing valve cooling system normal operation, on-line cleaning is carried out to screening electrodes, reaches electrode surface non-scaling, nothing
The effect of adventitious deposit, enables converter valve to run steadily in the long term, safety benefit and remarkable in economical benefits.To multiple cold systems of power plant's valve
Since the practice in nearly 2 years of system system, effect is very good.
Claims (3)
1. a kind of valve cooling system screening electrodes on-line cleaning method, which is characterized in that comprise the following steps：Pass through cooling water replenishment
Case adds cleaning solution into converter valve inner cold water, and the pH for controlling inner cold water is 6.8 ~ 7.2, and electrical conductivity is less than 0.5 μ S/cm；Cleaning
Liquid is in cyclic process, by the way that chelatropic reaction, dissolving, stripping electrode surface deposition occurs with the deposit of screening electrodes surfaces of aluminum
Object, the complex compound for reacting generation flow through interception removal after system filters, realize the cleaning of electrode.
2. a kind of valve cooling system screening electrodes on-line cleaning method according to claim 1, which is characterized in that by quality hundred
Fraction meter, cleaning solution component are as follows：0.5~1% 1,2- dimethyl -3- hydroxyl -4- pyridones, 0.5~1% phytic acid, 0.5
~1% maleic acid-acrylic acid copolymer, 0.1~0.5% ammonium carbonate, remaining component are water.
3. valve cooling system screening electrodes on-line cleaning method according to claim 1, which is characterized in that the effect of ammonium carbonate
To adjust cleaning solution pH to neutrality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810014493.2A CN108080333A (en) | 2018-01-08 | 2018-01-08 | A kind of valve cooling system screening electrodes on-line cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810014493.2A CN108080333A (en) | 2018-01-08 | 2018-01-08 | A kind of valve cooling system screening electrodes on-line cleaning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108080333A true CN108080333A (en) | 2018-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810014493.2A Pending CN108080333A (en) | 2018-01-08 | 2018-01-08 | A kind of valve cooling system screening electrodes on-line cleaning method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650342A (en) * | 2020-06-29 | 2020-09-11 | 中国南方电网有限责任公司超高压输电公司广州局 | Scale formation and descaling test platform for pressure-equalizing electrode of cold water system in converter valve |
| CN111662783A (en) * | 2020-05-13 | 2020-09-15 | 河北冀研能源科学技术研究院有限公司 | Online descaling agent for voltage-sharing electrode of internal cooling water system of high-voltage direct-current transmission converter valve |
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| CA2124978A1 (en) * | 1993-09-08 | 1995-03-09 | Betzdearborn Inc. | Method and compositions for removing deposits from cooling water systems |
| CN101565660A (en) * | 2009-06-02 | 2009-10-28 | 董宇新 | Organic descaling composition, preparation method and application thereof |
| CN103272805A (en) * | 2013-05-29 | 2013-09-04 | 国家电网公司 | Cleaning method of cooling water system in converter valve |
| CN103934239A (en) * | 2014-04-08 | 2014-07-23 | 国家电网公司 | Converter valve voltage-sharing electrode regeneration device and method |
| CN104233329A (en) * | 2014-09-15 | 2014-12-24 | 河北省科学院能源研究所 | Chemical cleaning method of heat exchanger |
| CN106630197A (en) * | 2016-12-28 | 2017-05-10 | 国家电网公司 | Device and method for adding carbon dioxide into inner cooling water of converter valve |
-
2018
- 2018-01-08 CN CN201810014493.2A patent/CN108080333A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2124978A1 (en) * | 1993-09-08 | 1995-03-09 | Betzdearborn Inc. | Method and compositions for removing deposits from cooling water systems |
| CN101565660A (en) * | 2009-06-02 | 2009-10-28 | 董宇新 | Organic descaling composition, preparation method and application thereof |
| CN103272805A (en) * | 2013-05-29 | 2013-09-04 | 国家电网公司 | Cleaning method of cooling water system in converter valve |
| CN103934239A (en) * | 2014-04-08 | 2014-07-23 | 国家电网公司 | Converter valve voltage-sharing electrode regeneration device and method |
| CN104233329A (en) * | 2014-09-15 | 2014-12-24 | 河北省科学院能源研究所 | Chemical cleaning method of heat exchanger |
| CN106630197A (en) * | 2016-12-28 | 2017-05-10 | 国家电网公司 | Device and method for adding carbon dioxide into inner cooling water of converter valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111662783A (en) * | 2020-05-13 | 2020-09-15 | 河北冀研能源科学技术研究院有限公司 | Online descaling agent for voltage-sharing electrode of internal cooling water system of high-voltage direct-current transmission converter valve |
| CN111650342A (en) * | 2020-06-29 | 2020-09-11 | 中国南方电网有限责任公司超高压输电公司广州局 | Scale formation and descaling test platform for pressure-equalizing electrode of cold water system in converter valve |
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