CN114934269B - Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator - Google Patents

Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator Download PDF

Info

Publication number
CN114934269B
CN114934269B CN202210315857.7A CN202210315857A CN114934269B CN 114934269 B CN114934269 B CN 114934269B CN 202210315857 A CN202210315857 A CN 202210315857A CN 114934269 B CN114934269 B CN 114934269B
Authority
CN
China
Prior art keywords
conductivity
reactor
cold water
internal
passivation
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.)
Active
Application number
CN202210315857.7A
Other languages
Chinese (zh)
Other versions
CN114934269A (en
Inventor
叶春松
王天平
王宇
贾旭翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University WHU
Original Assignee
Wuhan University WHU
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wuhan University WHU filed Critical Wuhan University WHU
Priority to CN202210315857.7A priority Critical patent/CN114934269B/en
Publication of CN114934269A publication Critical patent/CN114934269A/en
Application granted granted Critical
Publication of CN114934269B publication Critical patent/CN114934269B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/63—Treatment of copper or alloys based thereon
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/77—Controlling or regulating of the coating process
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemically Coating (AREA)

Abstract

The invention discloses an automatic regulating and controlling system and method for in-service passivation and acid washing of a generator hollow copper wire. And in the running state of the generator, the bypass of the ion exchange parallel reactor is adopted to treat the internal cold water of the generator, the running mode of the reactor is selected according to the running requirement of the system, the running upper limit of the conductivity of the internal cold water is set, the conductivity of the internal cold water is used as a control parameter, the on-off of an electromagnetic valve in the reactor is automatically controlled, and the quality of the internal cold water is regulated and controlled to be in a slightly alkaline self-passivation maintaining working condition or a slightly acidic pickling working condition so as to promote the formation of a passivation film on the inner surface of a hollow copper wire or the dissolution of a failure passivation film. The invention can realize the automatic control and the quick switching of the cold water alkalescence self-passivation maintaining working condition and the subacidity acid washing working condition in the generator, and avoids the water quality fluctuation caused by the conventional manual micro-alkalization adjustment and the limitation that the conventional chemical acid washing can only be carried out during the shutdown period.

Description

Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator
Technical Field
The invention belongs to the technical field of corrosion and protection of power generation equipment, and particularly relates to an automatic regulation and control system and method for in-service passivation and acid washing of a hollow copper wire of a generator.
Background
During operation of the generator, the stator copper coil generates a large amount of heat due to the action of the strong electromagnetic field. In order to ensure the normal operation of the generator, cold water in the generator is generally flowed through the hollow copper wire, so that the whole heating stator coil is cooled. Although pure copper has good corrosion resistance, the copper wire may still undergo severe corrosion during long-term operation, shutdown and maintenance of the system. Corrosion products can deposit in the system, reduce the flow of internal cold water, worsen the cooling effect, and even cause local overheating of the coils, unplanned shutdown of the generator (She Chunsong. Micro copper corrosion control principles in pure water and applied technical research [ D ]. Shanghai: university, 2002;Svoboda M,Bauer T.Corrosion and deposits in water-cooled generator stator windings: part 4:operating experience with flow restrictions in stator cooling water systems[J ]. Powerplant Chemistry,2019,21 (2): 62-72;Svoboda R.Corrosion and deposits in water-cooled generator stator windings: part 1:behaviour of copper[J ]. PowerPlant Chemistry,2018,20 (5): 297-309).
In order to avoid corrosion and blockage of the copper wire, the quality of the internal cooling water needs to be regulated and controlled to be in the self-passivation range of the copper wire in the normal operation process of the internal cooling water system of the generator. Wherein, the ion exchange micro-alkalization treatment of the internal cooling water is a technology commonly adopted on site (She Chunsong. Principle of micro copper corrosion control in pure water and application technical research [ D ]. Shanghai: university of same Ji, 2002; DL/T1039-2016 electric generator internal cooling water treatment guide [ S ]. Beijing: china electric Press, 2016;Svobada,R.Review of alkaline treatment for generator stator cooling water systems[J ]. Power plant chemistry.2014,16 (6): 352-360). At present, the ion exchange micro-alkalization of the internal cold water is generally controlled by adopting a manual adjustment method, namely, the size of the bypass treatment flow of the micro-alkalization of the internal cold water is manually adjusted according to the actually measured water quality of the internal cold water, and the water quality of the internal cold water is adjusted to a specified range. The manual adjustment method needs to pay attention to the quality of the internal cooling water in real time, and then a professional performs manual operation according to operation experience, so that more manpower is required, and automatic adjustment of the quality of the internal cooling water cannot be realized. Furthermore, manual adjustment is performed intermittently: when the measured pH value is lower than the specified lower operation limit, the bypass processing flow is manually adjusted up, and when the measured conductivity exceeds the upper operation limit, the bypass processing flow is manually adjusted down. With each adjustment, the system needs to go through a long transition to reach steady state. During this process, the quality of the internal cooling water is in a fluctuating state. Studies have shown that the frequently fluctuating quality of the cold water is detrimental to the effective self-passivation of copper conductors and the stability of the passivation film (Feng B, zha F, li L, et al, corrosion behavior of T, 2 brass in power plant generator stator cooling water [ J ]. Russian Journal of Electrochemistry,2019,55 (10): 943-952;Zhang R,Cao S,Pan H.Evaluation of hollow copper strands corrosion behavior in stator cooling water using response surface methodology[J ]. Materials and Corrosion,2018,69 (6): 804-813).
During cold water operation in a generator, the system operating conditions need to be monitored strictly. When the system shows corrosion and blockage symptoms (DL/T801-2010 large generator internal cooling water quality and system technical requirements [ S ]. Beijing: china electric publishing company, 2010), the internal cooling water system needs to be chemically cleaned to dredge a copper wire blockage passage and restore the heat exchange performance of the copper wire. Conventional chemical cleaning is to dissolve and strip copper corrosion products deposited in the system during generator shutdown using a dedicated pickling solution containing an organic or inorganic acid (Bauer T, svoboda M, svoboda r.corrosion and deposits in water-cooled generator stator windings: part 3:removal of flow restrictions[J ]. Powerplant Chemistry,2019,21 (1): 10-22; he Feng, liu, jiang Xiao, etc.. Chemical cleaning of water cooled generator stator bar clogging [ J ]. Cleaning world, 2007 (10): 36-38; li Haoliang, pan Jianna, li Xiaogang, etc.. 1000MW turbo generator stator cooling water system chemical cleaning technique [ J ]. Large motor technique, 2017 (06): 5-9). However, off-stream chemical cleaning cannot be handled in a timely manner based on the real-time status of the system. Even if the system exhibits corrosion and blockage symptoms during operation, the corrosion products can only be chemically cleaned until the generator is shut down for service. At the same time, this limitation completely separates the normal operation of the cold water system in the generator from the chemical cleaning process. When the system is subjected to chemical cleaning, a temporary chemical cleaning system is additionally built. In order to eliminate system anomalies caused by corrosion product deposition in time, there is a need for an automatically controlled, on-line chemical cleaning method that can quickly switch to chemical pickling conditions.
Disclosure of Invention
Aiming at the problems of passivation and acid washing of the existing generator hollow copper wire, the invention provides an automatic control system and method for in-service passivation and acid washing of the generator hollow copper wire, which realize automatic control and quick switching of two working conditions of in-service passivation and acid washing of the copper wire and provide guarantee for safe and economic operation of the generator.
The technical idea of the invention is that according to the operation requirement of a generator internal cooling water system, the target working condition of the generator internal cooling water is determined, the operation upper limit of the internal cooling water conductivity and the actually measured internal cooling water conductivity are used as control parameters, the operation mode and the operation condition of the ion exchange resin reactor are automatically controlled through an electromagnetic valve, and the internal cooling water ion exchange micro-alkalization or micro-acidification capable of being automatically controlled is realized through the internal cooling water ion exchange bypass circulation treatment.
The technical scheme provided by the invention is as follows:
in a first aspect, the invention provides an automatic in-service passivation and acid washing regulation system for an air-core copper wire of a generator, which comprises a main circuit formed by connecting an inner cold water tank, an inner cold water circulating pump and a stator winding through pipelines, and an inner cold water ion exchange bypass connected between an outlet of the inner cold water pump and the stator winding;
wherein the internal cooling water ion exchange bypass comprises a mixed resin reactor and a single-bed resin reactor which are connected in parallel and controlled by a microcomputer controller; the water inlets of the mixed resin reactor and the single-bed resin reactor are respectively provided with an electromagnetic valve, and the on-off of the electromagnetic valves is automatically controlled by a microcomputer controller through comparing the actual measured value of the conductivity of the internal cooling water with the preset upper limit of the conductivity;
an online monitoring instrument for pH and conductivity of the internal cold water is arranged between the internal cold water tank and the internal cold water circulating pump in the main path;
the water inlet in the internal cooling water bypass is provided with a flowmeter, and the water outlet of the parallel exchange resin reactor is provided with an on-line pH and conductivity monitoring instrument.
Further, the mixed resin reactor is filled with a mixed resin composed of an RNa cation exchange resin and an ROH anion exchange resin.
Further, the single bed resin reactor is filled with RH cation exchange resin.
Further, when the mixed resin reactor is a micro-alkalization reactor, the single-bed resin reactor is a conductivity regulator; when the single-bed resin reactor is a micro-acid reactor, the mixed resin reactor is a conductivity regulator.
In a second aspect, the invention provides a method for in-service passivation and acid cleaning by using the in-service passivation and acid cleaning automatic control system for the generator hollow copper wire according to the first aspect, which comprises the following steps: in the running state of the generator, the internal cold water of the generator is treated by adopting an internal cold water ion exchange bypass, the running mode of the reactor is selected according to the running requirement of the system, the running upper limit of the conductivity of the internal cold water is set, the conductivity of the internal cold water is used as a control parameter, the on-off of a water inlet electromagnetic valve of the resin reactor is automatically controlled, and the quality of the internal cold water is regulated and controlled to be in a slightly alkaline self-passivation maintaining working condition or a slightly acidic pickling working condition so as to promote the formation of a passivation film on the inner surface of a hollow copper wire or the dissolution of a failure passivation film.
Further, the operation requirements of the generator internal cooling water system comprise internal cooling water micro-alkalization treatment to regulate the quality of the internal cooling water to be in the self-passivation range of the hollow copper wire and internal cooling water micro-acidification treatment to regulate the quality of the internal cooling water to be in the dissolution range of the failure passivation film.
Further, the slightly alkaline self-passivation maintaining working condition is that a mixed resin reactor is used as a micro-alkalization reactor, a single-bed resin reactor is used as a conductivity regulator, the upper limit of the running of the conductivity of the internal cooling water is set to be 2.0 mu S/cm, a water inlet electromagnetic valve of the micro-alkalization reactor is kept in a normally open state, the water inlet electromagnetic valve of the conductivity regulator is controlled by the conductivity of the internal cooling water, and the slowly released OH is exchanged by utilizing ions of the micro-alkalization reactor - Micro-alkalization of inner cold water, ion exchange and slow release of H by using conductivity regulator + The conductivity of the inner cooling water is regulated and controlled not to exceed the upper operation limit, and the formation of a passivation film on the inner surface of the hollow copper wire is promoted after the slightly alkaline inner cooling water enters the main circulation cooling system.
Further, the alkalescence self-passivation keeps the steady-state pH value of the internal cooling water at 8.7-8.9 under the working condition. According to Cu-H 2 The potential-pH diagram of the O system shows that the presence of the inner cooling water in this pH range allows the hollow copper wire to be in an effective passivation zone. Furthermore, copper oxide formed by oxidation of copper can exist stably. The solubility of copper oxide in the pH range is very low, which is beneficial to the growth of passivation film.
Further, the slightly acidic pickling working condition is that a single-bed resin reactor is used as a slightly acidic reactor, a mixed resin reactor is used as a conductivity regulator, the upper limit of the conductivity operation of the internal cooling water is set to be 3.0 mu S/cm-5.0 mu S/cm, an electromagnetic valve of the slightly acidic reactor is kept in a normally open state, a water inlet electromagnetic valve of the conductivity regulator is controlled by the conductivity of the internal cooling water, and the slowly released H is exchanged by utilizing the ion of the slightly acidic reactor + Slightly acidified internal cooling waterIon exchange of slowly released OH using conductivity regulator - And regulating and controlling the conductivity of the internal cooling water not to exceed the upper operation limit, and dissolving the invalid passivation film on the inner surface of the hollow copper wire after the slightly acidic internal cooling water enters the main circulation cooling system.
Further, under the slightly acidic pickling working condition, the steady-state pH value of the internal cooling water is 4.7-5.0. In Cu form + Or Cu 2+ Concentration 10 - 6 mol/L is the limit of copper oxide dissolution occurrence, cu 2 The pH at which O begins to dissolve was 5.16 and the pH at which CuO begins to dissolve was 6.95. Therefore, the micro-acidification treatment of the internal cooling water can slowly dissolve the failure passivation film in the hollow copper wire of the generator.
Theoretical calculation results also show that in the slightly acidic range, the dissolution removal capacity of the slightly acidic inner cooling water for the failure passivation film is enhanced to 1.58 times as high as that of the original inner cooling water when the pH value of the inner cooling water is reduced by 0.1 units.
The beneficial effects of the invention are as follows:
(1) The invention adopts the form of parallel connection of a mixed resin reactor and an RH resin reactor. In the process of micro-acidification, the RH resin reactor plays a role in ion exchange slow release H + The mixed resin reactor plays a role of slowly releasing OH < - > to neutralize excessive H when the conductivity of the inner cold water exceeds the upper regulation limit + (conductivity regulator); in the micro-alkalization process, the mixed resin reactor plays a role of ion exchange slow-release OH-micro-alkalization internal cooling water (micro-alkalization reactor), and the single-bed resin reactor plays a role of slow-release H when the conductivity of the internal cooling water exceeds the upper regulation limit + Neutralization of excess OH - (conductivity regulator). The on-off of the water inlet electromagnetic valve of the two resin reactors is controlled by the microcomputer controller, and the cooperative treatment of the two resin reactors and the internal cooling water can regulate the internal cooling water to a proper alkalescence or subacidity range.
(2) The invention can realize the automatic control and the quick switching of two working conditions of the slightly alkaline self-passivating maintenance or the slightly acidic pickling of the cold water in the generator. Under the working condition of keeping the alkalescence self-passivation, the pH value of the internal cooling water can be automatically controlled in a stable alkalescence range, so that the water quality fluctuation caused by conventional manual adjustment is avoided, and the effective and stable passivation of the inner surface of the hollow copper conductor is ensured. When the system needs to be subjected to pickling, the system can be rapidly switched to a slightly acidic pickling working condition, the pH value of the internal cooling water can be automatically controlled in a stable slightly acidic range, and the ineffective passivation film is removed by on-line dissolution, so that the limitation that conventional chemical cleaning can only be performed during the shutdown of the generator is avoided, the operation is flexible, the abnormal conditions such as the flow reduction of the internal cooling water and the overtemperature of a copper wire can be timely eliminated, and the safe and economic operation of the generator is ensured.
Drawings
FIG. 1 is a schematic diagram of an automatic control system for in-service passivation and acid cleaning of hollow copper conductors of a generator according to the present invention.
The figure 1. An inner cold water tank; 2. an online conductivity meter for the internal cooling water; 3. an online pH meter of the internal cooling water; 4. an internal cooling water circulating pump; 5. a stator winding; 6. a water inlet flowmeter of the ion exchange reactor is connected in parallel; 7. a mixed resin reactor; 8. a single bed resin reactor; 9. an online conductivity meter for water discharged from the parallel ion exchange reactor; 10. an online pH meter for water outlet of the parallel ion exchange reactor; 11. a microcomputer controller; 12. a pressure regulating valve; 13. a water inlet electromagnetic valve of the mixed resin reactor; 14. a water outlet valve of the mixed resin reactor; 15. a single bed resin reactor water inlet solenoid valve; 16. the water outlet valve of the single-bed resin reactor.
Detailed Description
The present invention will be further described with reference to the following specific examples, which should not be construed as limiting the scope of the invention.
Example 1
As shown in fig. 1, the automatic in-service passivation and acid washing regulation system for the hollow copper wire of the generator comprises a main circuit formed by connecting an inner cold water tank 1, an inner cold water circulating pump 4 and a stator winding 5 through pipelines, and an inner cold water ion exchange bypass connected between an outlet of the inner cold water circulating pump 4 and the stator winding 5.
Wherein the internal cooling water ion exchange bypass comprises a mixed resin reactor 7 and a single-bed resin reactor 8 which are connected in parallel and controlled by a microcomputer controller 11; the water inlets of the mixed resin reactor 7 and the single-bed resin reactor 8 are respectively provided with electromagnetic valves 13 and 15, and the on-off of the electromagnetic valves is automatically controlled by a microcomputer controller through comparing the measured value of the conductivity of the internal cooling water with the preset upper limit of the conductivity.
An inner cold water online pH meter 3 and a dissolved inner cold water online conductivity meter 2 are arranged between the inner cold water tank 1 and the inner cold water circulating pump 4 in the main path.
The water inlet of the internal cooling water bypass is provided with a water inlet flowmeter 6 of the parallel ion exchange reactor. The water outlet of the parallel ion exchange resin reactor is provided with an online conductivity meter 9 for the effluent of the parallel ion exchange reactor and an online pH meter 10 for the effluent of the parallel ion exchange reactor.
The mixed resin reactor is filled with mixed resin composed of RNa cation exchange resin and ROH anion exchange resin.
The single bed resin reactor is filled with RH cation exchange resin.
The mixed resin reactor is a micro-alkalization reactor; the single bed resin reactor is a conductivity regulator.
Example 2
The automatic regulating and controlling method for in-service passivation and acid washing of the hollow copper conductor of the generator comprises the following main steps:
(1) Slightly alkaline passivation working condition of internal cooling water
Selecting a alkalescent passivation working condition in the microcomputer controller 11, and setting the upper limit of conductivity operation to be 2.0 mu S/cm;
setting a water inlet electromagnetic valve 13 of the mixed resin reactor to be in a normally open state;
the on-off of the single-bed resin reactor water inlet electromagnetic valve 15 is controlled by the microcomputer controller 11, when the conductivity of the internal cold water is about to exceed the upper operation limit, the electromagnetic valve is switched on, and part of the internal cold water enters the single-bed resin reactor. Thereby precisely adjusting the conductivity of the inner cooling water;
the inlet water flow rate of the parallel ion exchange reactors is controlled to be 10% of the main circulation cooling flow rate through the pressure regulating valve 11.
Monitoring the conductivity and the pH of the effluent of the ion exchange reactor and the parallel ion exchange reactor in the process of micro-alkalization of the ion exchange of the internal cold water;
during steady state micro-alkalization, the conductivity of the inner cold water is basically stabilized at 2.0 mu S/cm, and the pH value of the inner cold water is basically stabilized at 8.7-8.9.
(2) Slightly acidic pickling working condition of internal cooling water
And when the system monitoring shows that the corrosion and blockage symptoms of the hollow copper wire appear, evaluating the severity of the corrosion and blockage of the system, and switching to a proper slightly acidic pickling working condition of the internal cooling water.
System monitoring shows that the system has slight corrosion and blockage, and in order to avoid further development of corrosion, the failure passivation film is subjected to online acid washing by adopting inner cold water micro-acidification.
Selecting a slightly acidic pickling working condition in a microcomputer controller 11, and setting the upper limit of conductivity operation to be 3.0 mu S/cm;
setting a water inlet electromagnetic valve 15 of the single-bed resin reactor to be in a normally open state;
the on-off of the water inlet electromagnetic valve 13 of the mixed resin reactor is controlled by the microcomputer controller 11, when the conductivity of the internal cold water is about to exceed the upper operation limit, the electromagnetic valve is connected, and part of the internal cold water enters the mixed resin reactor so as to precisely adjust the conductivity of the internal cold water;
the inlet water flow rate of the parallel ion exchange reactors is controlled to be 10% of the main circulation cooling flow rate through the pressure regulating valve 11.
Monitoring the conductivity and the pH of the effluent of the ion exchange reactor and the parallel ion exchange reactor in the process of micro-acidification of the ion exchange of the internal cooling water;
during steady state micro-acidification, the conductivity of the cold water was substantially stabilized at 3.0 μS/cm and the pH of the cold water was substantially stabilized at 5.0.
Example 3
The automatic regulating and controlling method for in-service passivation and acid washing of the hollow copper conductor of the generator comprises the following main steps:
(1) Slightly alkaline passivation working condition of internal cooling water
Selecting a alkalescent passivation working condition in the microcomputer controller 11, and setting the upper limit of conductivity operation to be 2.0 mu S/cm;
setting a water inlet electromagnetic valve 13 of the mixed resin reactor to be in a normally open state;
the on-off of the single-bed resin reactor water inlet electromagnetic valve 15 is controlled by the microcomputer controller 11, when the conductivity of the internal cold water is about to exceed the upper operation limit, the electromagnetic valve is switched on, and part of the internal cold water enters the single-bed resin reactor. Thereby precisely adjusting the conductivity of the inner cooling water;
the inlet water flow rate of the parallel ion exchange reactors is controlled to be 10% of the main circulation cooling flow rate through the pressure regulating valve 11.
Monitoring the conductivity and the pH of the effluent of the ion exchange reactor and the parallel ion exchange reactor in the process of micro-alkalization of the ion exchange of the internal cold water;
during steady state micro-alkalization, the conductivity of the inner cold water is basically stabilized at 2.0 mu S/cm, and the pH value of the inner cold water is basically stabilized at 8.7-8.9.
(2) Slightly acidic pickling working condition of internal cooling water
And when the system monitoring shows that the corrosion and blockage symptoms of the hollow copper wire appear, evaluating the severity of the corrosion and blockage of the system, and switching to a proper slightly acidic pickling working condition of the internal cooling water.
The system monitoring shows that the system has serious corrosion and blockage, and in order to avoid the further development of corrosion, the failure passivation film is subjected to on-line pickling by adopting the micro-acidification of the internal cooling water.
Selecting a slightly acidic pickling working condition in a microcomputer controller 11, and setting the upper limit of conductivity operation to be 4.0 mu S/cm;
setting a water inlet electromagnetic valve 15 of the single-bed resin reactor to be in a normally open state;
the on-off of the water inlet electromagnetic valve 13 of the mixed resin reactor is controlled by the microcomputer controller 11, when the conductivity of the internal cold water is about to exceed the upper operation limit, the electromagnetic valve is connected, and part of the internal cold water enters the mixed resin reactor so as to precisely adjust the conductivity of the internal cold water;
the inlet water flow rate of the parallel ion exchange reactors is controlled to be 10% of the main circulation cooling flow rate through the pressure regulating valve 11.
Monitoring the conductivity and the pH of the effluent of the ion exchange reactor and the parallel ion exchange reactor in the process of micro-acidification of the ion exchange of the internal cooling water;
during steady state micro-acidification, the conductivity of the cold water was substantially stabilized at 4.0 μS/cm and the pH of the cold water was substantially stabilized at 4.85.
Example 4
The automatic regulating and controlling method for in-service passivation and acid washing of the hollow copper conductor of the generator comprises the following main steps:
(1) Slightly alkaline passivation working condition of internal cooling water
Selecting a alkalescent passivation working condition in the microcomputer controller 11, and setting the upper limit of conductivity operation to be 2.0 mu S/cm;
setting a water inlet electromagnetic valve 13 of the mixed resin reactor to be in a normally open state;
the on-off of the single-bed resin reactor water inlet electromagnetic valve 15 is controlled by the microcomputer controller 11, when the conductivity of the internal cold water is about to exceed the upper operation limit, the electromagnetic valve is switched on, and part of the internal cold water enters the single-bed resin reactor. Thereby precisely adjusting the conductivity of the inner cooling water;
the inlet water flow rate of the parallel ion exchange reactors is controlled to be 10% of the main circulation cooling flow rate through the pressure regulating valve 11.
Monitoring the conductivity and the pH of the effluent of the ion exchange reactor and the parallel ion exchange reactor in the process of micro-alkalization of the ion exchange of the internal cold water;
during steady state micro-alkalization, the conductivity of the inner cold water is basically stabilized at 2.0 mu S/cm, and the pH value of the inner cold water is basically stabilized at 8.7-8.9.
(2) Slightly acidic pickling working condition of internal cooling water
And when the system monitoring shows that the corrosion and blockage symptoms of the hollow copper wire appear, evaluating the severity of the corrosion and blockage of the system, and switching to a proper slightly acidic pickling working condition of the internal cooling water.
System monitoring shows that the system has serious corrosion and blockage, and in order to avoid further development of corrosion, the failure passivation film is subjected to on-line pickling by adopting inner cold water micro-acidification.
Selecting a slightly acidic pickling working condition in a microcomputer controller 11, and setting the upper limit of conductivity operation to be 5.0 mu S/cm;
setting a water inlet electromagnetic valve 15 of the single-bed resin reactor to be in a normally open state;
the on-off of the water inlet electromagnetic valve 13 of the mixed resin reactor is controlled by the microcomputer controller 11, when the conductivity of the internal cold water is about to exceed the upper operation limit, the electromagnetic valve is connected, and part of the internal cold water enters the mixed resin reactor so as to precisely adjust the conductivity of the internal cold water;
the inlet water flow rate of the parallel ion exchange reactors is controlled to be 10% of the main circulation cooling flow rate through the pressure regulating valve 11.
Monitoring the conductivity and the pH of the effluent of the ion exchange reactor and the parallel ion exchange reactor in the process of micro-acidification of the ion exchange of the internal cooling water;
during steady state micro-acidification, the conductivity of the cold water was substantially stabilized at 5.0 μS/cm and the pH of the cold water was substantially stabilized at 4.7.
The present invention is not limited to the above-mentioned embodiments, but any modifications, equivalents, improvements and modifications within the scope of the invention will be apparent to those skilled in the art.

Claims (7)

1. An automatic regulating and controlling system for in-service passivation and acid washing of a generator hollow copper wire is characterized in that: the device comprises a main path formed by connecting an inner cold water tank, an inner cold water circulating pump and a stator winding through pipelines, and an inner cold water ion exchange bypass connected between an outlet of the inner cold water pump and the stator winding;
wherein the internal cooling water ion exchange bypass comprises a mixed resin reactor and a single-bed resin reactor which are connected in parallel and controlled by a microcomputer controller; the water inlets of the mixed resin reactor and the single-bed resin reactor are respectively provided with an electromagnetic valve, and the on-off of the electromagnetic valves is automatically controlled by a microcomputer controller through comparing the actual measured value of the conductivity of the internal cooling water with the preset upper limit of the conductivity; the mixed resin reactor is filled with mixed resin consisting of RNa cation exchange resin and ROH anion exchange resin; the single-bed resin reactor is filled with RH cation exchange resin;
if the mixed resin reactor is a micro-alkalization reactor, the single-bed resin reactor is a conductivity regulator; if the single-bed resin reactor is a micro-acid reactor, the mixed resin reactor is a conductivity regulator;
an online monitoring instrument for pH and conductivity of the internal cold water is arranged between the internal cold water tank and the internal cold water circulating pump in the main path;
the water inlet in the internal cooling water bypass is provided with a flowmeter, and the water outlet of the parallel exchange resin reactor is provided with an on-line pH and conductivity monitoring instrument.
2. An in-service passivation and pickling method by an in-service passivation and pickling automatic control system according to claim 1, characterized by the steps of: in the running state of the generator, the internal cold water of the generator is treated by adopting an internal cold water ion exchange bypass, the running mode of the reactor is selected according to the running requirement of the system, the running upper limit of the conductivity of the internal cold water is set, the conductivity of the internal cold water is used as a control parameter, the on-off of an electromagnetic valve in the resin reactor is automatically controlled, and the quality of the internal cold water is regulated and controlled to be in a slightly alkaline self-passivation maintaining working condition or a slightly acidic pickling working condition so as to promote the formation of a passivation film on the inner surface of a hollow copper wire or the dissolution of a failure passivation film.
3. The method according to claim 2, characterized in that: the operation requirements of the generator internal cooling water system comprise the internal cooling water micro-alkalization treatment to regulate the internal cooling water quality to be in the self-passivation range of the hollow copper wire and the internal cooling water micro-acidification treatment to regulate the internal cooling water quality to be in the dissolution range of the invalid passivation film.
4. The method according to claim 2, characterized in that: the slightly alkaline self-passivation maintaining working condition is that a mixed resin reactor is used as a micro-alkalization reactor, a single-bed resin reactor is used as a conductivity regulator, the upper limit of the running of the conductivity of the internal cold water is set to be 2.0 mu S/cm, a water inlet electromagnetic valve of the micro-alkalization reactor is kept in a normally open state, the water inlet electromagnetic valve of the conductivity regulator is controlled by the conductivity of the internal cold water, and the slowly released OH is exchanged by utilizing the ion of the micro-alkalization reactor - Micro-alkalization of inner cold water, ion exchange and slow release of H by using conductivity regulator + The conductivity of the inner cooling water is regulated and controlled not to exceed the upper operation limit, and the formation of a passivation film on the inner surface of the hollow copper wire is promoted after the slightly alkaline inner cooling water enters the main circulation cooling system.
5. The method according to claim 2, characterized in that: the alkalescence self-passivation keeps the steady-state pH value of the internal cooling water at 8.7-8.9 under the working condition.
6. The method according to claim 2, characterized in that: the slightly acidic pickling working condition is that a single-bed resin reactor is used as a slightly acidic reactor, a mixed resin reactor is used as a conductivity regulator, the upper limit of the running of the conductivity of the internal cold water is set to be 3.0 mu S/cm-5.0 mu S/cm, an electromagnetic valve of the slightly acidic reactor is kept in a normally open state, a water inlet electromagnetic valve of the conductivity regulator is controlled by the conductivity of the internal cold water, and the slowly released H is exchanged by utilizing the ion of the slightly acidic reactor + Micro-acidification of inner cold water, ion exchange of slowly released OH with conductivity regulator - And regulating and controlling the conductivity of the internal cooling water not to exceed the upper operation limit, and dissolving the invalid passivation film on the inner surface of the hollow copper wire after the slightly acidic internal cooling water enters the main circulation cooling system.
7. The method according to claim 2, characterized in that: under the slightly acidic pickling working condition, the steady-state pH value of the internal cooling water is 4.7-5.0.
CN202210315857.7A 2022-03-28 2022-03-28 Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator Active CN114934269B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210315857.7A CN114934269B (en) 2022-03-28 2022-03-28 Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210315857.7A CN114934269B (en) 2022-03-28 2022-03-28 Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator

Publications (2)

Publication Number Publication Date
CN114934269A CN114934269A (en) 2022-08-23
CN114934269B true CN114934269B (en) 2023-05-16

Family

ID=82863410

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210315857.7A Active CN114934269B (en) 2022-03-28 2022-03-28 Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator

Country Status (1)

Country Link
CN (1) CN114934269B (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027362A1 (en) * 1980-07-18 1982-02-18 Siemens AG, 1000 Berlin und 8000 München COOLING ARRANGEMENT AND METHOD FOR OPERATING THE ARRANGEMENT
JPH089030B2 (en) * 1987-12-21 1996-01-31 三菱電機株式会社 Method of pH control of water by ion exchange resin
CN1126231C (en) * 2001-12-17 2003-10-29 武汉大学 Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system
CN1896009B (en) * 2006-06-09 2010-12-22 江西省电力科学研究院 Alkalescent water-quality treatment and treating system for double-internal water-cooled generator
CN112798644B (en) * 2020-12-28 2022-04-12 武汉大学 Film thermal resistance measuring system and method for evaluating corrosion degree and pickling and passivation effects of hollow copper conductor of generator
CN112921333B (en) * 2021-01-21 2022-02-01 武汉大学 Internal-cooling water ion exchange slow-release micro-acidification flexible online cleaning system and method for failure passivation film of hollow copper conductor of generator

Also Published As

Publication number Publication date
CN114934269A (en) 2022-08-23

Similar Documents

Publication Publication Date Title
CN112921333B (en) Internal-cooling water ion exchange slow-release micro-acidification flexible online cleaning system and method for failure passivation film of hollow copper conductor of generator
CN1896009A (en) Alkalescent water-quality treatment and treating system for double-internal water-cooled generator
CN109607680A (en) A kind of electric generator inner cooling method for treating water and its device
CN202542958U (en) Fully-automatic boiler water supplying and oxygen feeding device
CN114934269B (en) Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator
CN203546148U (en) On-line temperature control system for acid-pickling solution
CN202359640U (en) Blow-down device for industrial circulation cooling water
CN212403586U (en) Indirect air cooling system circulating water intelligence clean system
CN106759637B (en) Operation method of hydropower station open-close type combined technical water supply system
CN1126231C (en) Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system
CN116121810A (en) High-temperature-resistant SPE (solid electrolytic Water) electrolysis system and control method
CN111977758B (en) Intelligent circulating water purifying system of indirect air cooling system and application method thereof
CN202390269U (en) Inner cooling water automatic alkalifying treatment device for power plant
CN210764397U (en) Generator stator cooling water quality blending and protecting device
CN214270304U (en) Simple and convenient decide two bed processing apparatus of cold water bypass
CN118108312A (en) Internal cooling water treatment device and method
CN112960804B (en) Generator inner cooling water bypass treatment device and control method
CN220116389U (en) Stator cooling water quality purification and regulation system
CN117417028A (en) Bypass alkalization-purification coordination treatment method and system for generator stator cooling water
CN112984491A (en) Online application method and system of nuclear-grade dispersant
CN114959676B (en) In-service self-passivation system and method for cold water oxygenation reinforced hollow copper wire in generator
CN110171870A (en) A kind of refined processing high-speed mixing bed failure terminal point control system and method
CN219489704U (en) Automatic slight alkali adjusting device of cold water in generator
CN112225291A (en) Generator inner cooling water treatment device based on separated bed EDI and control method
CN204848399U (en) Full -automatic high accuracy stator cooling water adder -subtractor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant