CN112921333B - 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 - Google Patents

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 Download PDF

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CN112921333B
CN112921333B CN202110080737.9A CN202110080737A CN112921333B CN 112921333 B CN112921333 B CN 112921333B CN 202110080737 A CN202110080737 A CN 202110080737A CN 112921333 B CN112921333 B CN 112921333B
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water
ion exchanger
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acidification
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叶春松
王天平
贾旭翔
王宇
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Wuhan University WHU
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    • 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
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    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10—Other heavy metals
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/023—Water in cooling circuits
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH

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Abstract

The invention discloses an internal cooling water ion exchange slow-release micro-acidification flexible online cleaning system and method for a generator hollow copper conductor failure passive film, which are used for adjusting Cu in internal cooling water of a generator2+Introducing part of the cold water into RH ion exchanger in the bypass circulation treatment system to a certain concentration range, and slowly releasing H by using the ion exchanger+Micro-acidifying the inner cooling water to a certain pH range, and allowing the inner cooling water to enter a main circulation cooling system and then selectively dissolving the failure passivation film in the hollow copper conductor. The invention utilizes Cu in the inner cooling water2+Exchange of H in RH ion exchangers+The formed subacid solution selectively dissolves the CuO film on the inner surface of the hollow copper conductor, avoids the limitation of cleaning in the period of shutdown by adopting a low pH solution in the conventional chemical cleaning, can timely eliminate the system abnormal phenomenon caused by copper oxide deposition, prevents the further accumulation and deterioration of the corrosion of the copper conductor, and ensures the safe and economic operation of the generator.

Description

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
Technical Field
The invention belongs to the technical field of power generation equipment chemical cleaning engineering, and particularly relates to an inner-cooling water ion exchange slow-release micro-acidification flexible online cleaning method for a failure passivation film of a hollow copper conductor of a generator.
Background
During long-term operation, outage and maintenance of a cold water system in a stator of a generator, a hollow copper wire may be seriously corroded for various reasons. The deposited corrosion products can cause the problems of cooling water flow reduction, local overheating and the like, influence the safe and economic operation of the unit, and even cause the unplanned shutdown of the generator. Therefore, during the operation of the internal cooling water system, the operation state thereof needs to be strictly monitored. When the system state meets the criterion of chemical cleaning (the cooling water quality in the DL/T801-.
The conventional chemical cleaning is to perform group cleaning on the disassembled copper wire or complete machine cleaning on an internal cooling water system during the shutdown period of the generator, and dissolve and strip copper corrosion products by using organic acid or inorganic acid in a pickling agent. Chemical cleaning of hollow copper wires is a commonly used treatment method for dredging copper wire blocked passages and recovering heat exchange performance of copper wires (BAUER T, SVOBODA M, SVOBODA R. Corrossion and Deposits in Water-Cooled Generator stators windows: Part 3: Removal of Flow Restrictions [ J ] Powerplant Chemistry,2019,21(1): 10-22; Hefeng, Liu, Jiang, et al. In order to solve the problem of blockage of a stator bar of a 1000MW generator, Song Rei and the like carry out single washing on the bar with abnormal temperature, detect that about 90 percent of blockage in the bar is CuO, determine the formula and the washing control parameters of a chemical cleaning agent by adopting small scale-dissolving and corrosion-inhibiting tests, and carry out water washing, acid washing, water washing, rinsing and water washing on an internal cooling water system. The cleaning result shows that the chemical cleaning effect of the whole machine is obvious, the technical economy is high, various test indexes of the internal cooling water system are close to the level of the generator before delivery or when the generator starts to be in commissioning, and compared with the traditional method that a single winding bar is treated one by one, a large amount of workload is saved (chemical cleaning of Song thunder 1000MW generator stator winding bars [ J ] cleaning world, 2009,25(9): 9-12). Lihaliang, et al analyzed the cause of excessive temperature in certain internal cooling water system bars, believed to be due to stator bar corrosion product deposition. Then, they performed a chemical cleaning of the entire machine on the chilled water system. After the whole machine is chemically cleaned, the parameters of the temperature difference between the wire rod layers, the temperature difference of the water outlet of the insulated water conduit and the like are restored to normal levels (Lihao, Panjianan, Lixiagang, and the like, 1000MW turbonator stator cooling water system chemical cleaning technology [ J ] large motor technology, 2017(06): 5-9).
The conventional chemical cleaning method can solve the problem of corrosion product accumulation of the hollow copper wireThe problem of clogging, but there are two problems: the conventional chemical cleaning can be performed only during the period of the shutdown of the generator. Generally, the internal cold water system has a limited chemical cleaning period. The pickling agent is used in a high concentration in order to enhance the dissolution and stripping ability of the copper corrosion product. This causes the conductivity of the solution to exceed the upper limit of the control of the normal operation of the internal cooling water system by 2.0 mu S/cm (Leptochloa chinensis, pure water micro copper corrosion control principle and applied technology research [ D)]Shanghai, university of Tongji, 2002; guide rule for cold water treatment in DL/T1039 and 2016 generator]Beijing, China Power Press, 2016). Therefore, conventional chemical cleaning can only be performed during generator shutdown. The limiting condition causes that the conventional chemical cleaning is not flexible enough and cannot be processed in time according to the real-time state of the internal cooling water system; ② the pH of the chemical cleaning solution is too low, and at the same time, Cu with protective action is dissolved2And (3) an O passivation film. Generally, the copper oxide on the inner surface of the hollow copper conductor is Cu as the inner layer2O, a double-layer membrane structure (ZHANG R, CAO S, PAN H. evaluation of hollow core strands being coated with porous surface using porous surface method [ J ]]Materials and corosion, 2018,69(6): 804-; mechanism and technical overview of how to treat cold water in generators by Cao shun an, Bing Qing and Zhang Rui Yuan]Industrial Water treatment 2016,36(5): 15-19). With Cu+Is 10-6mol/L as Cu2Limit of O dissolution, Cu at 25 deg.C2The O-film started to dissolve only when the solution pH was below 5.16 (POURBAIX M. characteristics on Electrochemical correction [ M ]]New York, Plenum Press, 1973). Under the condition that an internal cooling water system normally operates, the layer of Cu clings to the inner surface of the hollow copper conductor2The O film may exist stably. Therefore, Cu in the copper oxide of the hollow copper conductor2O still has passivation protection. The pH of the chemical cleaning liquid used by the conventional chemical cleaning is too low, and the Cu is removed while the CuO film on the outer layer is dissolved2And (3) an O passivation film.
Disclosure of Invention
The invention aims to provide an inner-cooling water ion exchange slow-release micro-acidification flexible online cleaning method of a passive film of a hollow copper conductor failure of a generator, aiming at solving the problems of the existing chemical cleaning technology of the hollow copper conductor, so that the system is chemically cleaned in the running state of the generator, a CuO film on the inner surface of the hollow copper conductor is selectively dissolved, abnormal phenomena of inner-cooling water flow reduction, overtemperature of the copper conductor and the like are eliminated in time, and the safe and economic operation of the generator is guaranteed.
The technical idea of the invention is that RH ion exchanger bypass circulation composed of H type cation exchange resin is adopted to treat inner cooling water, RH and Cu in the inner cooling water are utilized2+H formed by reaction+And (3) slightly acidifying the inner cooling water, selectively dissolving the CuO film on the inner surface of the hollow copper conductor, and determining the end point of the flexible online cleaning according to the change trend of the pH value and the conductivity of the inlet water and the outlet water of the exchanger.
The ion exchange micro-acidification is to dissolve an oxide film on the inner surface of the hollow copper wire by using acid released slowly by an RH ion exchanger. Adopt RH ion exchanger bypass to treat inner cooling water, RH and Cu in inner cooling water2+Ion exchange reaction occurs, and H is slowly released into the internal cold water+。H+Will dissolve the copper oxide on the inner surface of the hollow copper conductor and dissolve the generated Cu2+And then removed by RH. Thus continuously circulating to form Cu2+Equilibrium with RH ion exchange and dissolution of the spent passivation film CuO until the CuO is substantially removed from the system. The ion exchange reactions that occur correspondingly are as follows:
Cu2++2RH→R2Cu+2H+ (1)
CuO+2H+→Cu2++H2O (2)
cu in the system2+The material balance equation can be expressed as:
Cu2+cu formed by dissolving CuO in the stator winding2+Amount and reaction of Cu with RH reduced in RH ion exchanger2+Difference in amount, during dt time:
VdCCu＝Qdt(CCu,eq-CCu)-qdtCCu (3)
in the formula (I), the compound is shown in the specification,
v-water volume, m, of cold water system in generator3；
CCuCu in internal cold water2+The concentration of (2), μ g/L;
CCu，eqcu in internal cold water when CuO is dissolved to reach equilibrium2+The concentration of (2), μ g/L;
q-main circulation cooling flow, m3/h；
q-bypass loop processing flow, m3/h。
The CuO film for selectively dissolving the inner surface of the hollow copper conductor utilizes CuO and Cu2Difference in stability of O in acidic solution. The two copper oxides begin to dissolve in the acidic solution at different pH. The corresponding chemical reaction is as follows:
CuO+2H+→Cu2++H2O (4)
Cu2O+2H+→2Cu++H2O (5)
the equilibrium relationship between the two chemical reactions at 25 ℃ is as follows:
log[Cu2+]＝7.89-2pH (6)
log[Cu+]＝-0.84-pH (7)
with Cu+Or Cu2+At a concentration of 10-6mol/L is the limit of the onset of dissolution, Cu2The pH at which the O film started to dissolve was 5.16, while the pH at which the CuO film started to dissolve was 6.95. Therefore, the selective dissolution of CuO film and the protection of Cu still having passivation effect can be realized by adjusting the pH value of the internal cooling water to be between the two values2And (3) an O film.
The determination of the end point of the online cleaning according to the change trend of the pH and the conductivity of the inlet water and the outlet water of the exchanger refers to the following steps: cu having ion exchange reaction with RH resin during RH ion exchanger bypass cycle operation2+And H+Cu formed by dissolving CuO film2+Dynamic equilibrium is achieved when the exchanger inlet and outlet water pH and conductivity are at some relatively stable level. When the CuO film is cleaned on line until the CuO film is basically dissolved, the dynamic equilibrium is broken, and Cu in the solution is2+Gradually decreases to reach another relatively stable level. When the cleaning end point is reached, the pH value of the inlet water and the outlet water of the RH ion exchanger and the conductivity of the inlet water and the outlet water are close to. Therefore, the end point of the flexible online cleaning can be determined according to the change trend of the pH and the conductivity of the inlet water and the outlet water of the exchanger.
The technical scheme of the invention is as follows: inner-cooling water ion exchange slow-release micro-acidification flexible online cleaning method for generator hollow copper conductor failure passivation film, and Cu in inner-cooling water of generator is regulated and controlled2+Introducing part of the cold water into RH ion exchanger in the bypass circulation treatment system to a certain concentration range, and slowly releasing H by using the ion exchanger+Micro-acidifying the inner cooling water to a certain pH range, and allowing the inner cooling water to enter a main circulation cooling system and then selectively dissolving the failure passivation film in the hollow copper conductor.
Regulating and controlling Cu in cold water in generator2+The concentration is 100 mug/L-550 mug/L, the internal cooling water is led into an RH ion exchanger in a bypass circulation treatment system at the main circulation flow rate of 1% -10%, and the Cu in the internal cooling water is treated by the RH ion exchange resin2+Exchange for H+The pH (25 ℃) of the effluent is between 5.35 and 5.86.
And returning the effluent of the RH ion exchanger to an internal cold water tank, slowly adjusting the pH (25 ℃) of the solution to be 6.04-6.42 and the conductivity (25 ℃) to be 0.420-1.893 mu S/cm, introducing the slightly acidic solution in the internal cold water tank into a hollow copper conductor of the generator in the main circulation cooling system, and selectively dissolving a passive film CuO with the inner surface failure.
And the pH and the conductivity of the inlet water and the outlet water of the RH ion exchanger are monitored on line, and when the pH of the inlet water and the outlet water of the RH ion exchanger are close to the conductivity of the inlet water and the outlet water, the flexible on-line cleaning of the hollow copper conductor failure passivation film of the generator reaches the cleaning end point.
A system for cleaning a hollow-core copper wire failure passive film on line by ion exchange slow-release micro-acidification in an internal cooling water of a generator comprises a main circulation cooling system and an on-line cleaning bypass circulation system, wherein the main circulation cooling system comprises an internal cooling water tank, an internal cooling water on-line conductivity meter, an internal cooling water on-line pH meter, an internal cooling water circulating pump and a stator winding; the online cleaning bypass circulating system mainly comprises an internal cold water tank, an RH ion exchanger water outlet online conductivity meter, an RH ion exchanger water outlet online pH meter, an RH ion exchanger water inlet flow meter and an RH ion exchanger.
The system for cleaning the hollow copper wire failure passive film on line by the cold water ion exchange slow-release micro-acidification in the generator comprises a main circulation cooling system, a cold water sampling valve, a pressure regulating valve and a water tank, wherein the cold water sampling valve is connected with the pressure regulating valve; the online cleaning bypass circulating system also comprises an RH ion exchanger water inlet valve and an RH ion exchanger water outlet valve.
A use method of a system for cleaning a hollow copper conductor failure passive film on line by ion exchange slow-release micro-acidification of cold water in a generator comprises the following steps:
(1) stopping adding alkali, and preparing micro-acidification starting conditions:
stopping the alkali adding operation when the internal cooling water system normally operates;
collecting inner cooling water sample in a discontinuous sampling mode, and determining Cu in the inner cooling water2+Content (c);
when Cu is measured2+When the content is 100 mug/L-550 mug/L, preparing the RH ion exchanger for operation;
(2) putting into operation an RH ion exchanger, dissolving CuO by bypass circulation:
opening a water inlet valve of the RH ion exchanger and a water outlet valve of the RH ion exchanger, and controlling the bypass circulation processing flow to be 1% -10% of the main circulation cooling flow through a pressure regulating valve;
monitoring the conductivity and pH of the effluent of the internal cold water and the RH ion exchanger in the ion exchange micro-acidification online cleaning process;
during the stable period of cleaning, the pH value of the outlet water of the RH ion exchanger is 5.35-5.86, the pH value of the inner cooling water is stabilized at 6.04-6.42, and the electric conductivity is 0.420 mu S/cm-1.893 mu S/cm;
and in the later period of cleaning, the pH value of the inner cooling water is gradually reduced, the conductivity is gradually increased, and when the CuO in the system is basically completely dissolved, the pH value and the conductivity of the outlet water of the inner cooling water and the RH ion exchanger are basically equal.
The invention has the beneficial effects that: by adopting the technical scheme, the invention treats the inner cooling water by RH ion exchanger bypass circulation and utilizes H slowly released by the RH ion exchanger+The pH value of the internal cooling water is regulated and controlledSo as to realize the selective on-line cleaning of the CuO film on the inner surface of the hollow copper conductor. The ion exchange micro-acidification online cleaning method avoids the limitation that the conventional low-pH chemical cleaning can be carried out only during the shutdown period of the generator, is flexible to operate, can timely eliminate abnormal states such as internal cooling water flow reduction and overtemperature of copper wires, and ensures the safe and economic operation of the generator.
Drawings
FIG. 1 is a schematic structural diagram of a system for cleaning a hollow copper wire failure passivation film on line by ion exchange slow-release micro-acidification in cold water in a generator.
FIG. 1 shows an inner cold water tank; 2. an internal cooling water online conductivity meter; 3. an internal cooling water online pH meter; 4. an internal cooling water circulating pump; 5. a stator winding; 6, RH ion exchanger water inlet flow meter; an RH ion exchanger; 8, an RH ion exchanger effluent on-line conductivity meter; 9, an RH ion exchanger effluent online pH meter; 10. an internal cooling water sampling valve; 11. a pressure regulating valve; a water inlet valve of the RH ion exchanger; and 13, an outlet valve of the RH ion exchanger.
Detailed Description
Example 1
A system for cleaning a hollow copper conductor failure passive film on line by ion exchange slow-release micro-acidification in a generator is shown in figure 1 and comprises a main circulating cooling system and an on-line cleaning bypass circulating system.
The main circulation cooling system mainly comprises an inner cooling water tank 1, an inner cooling water online conductivity meter 2, an inner cooling water online pH meter 3, an inner cooling water circulating pump 4, a stator winding 5, an inner cooling water sampling valve 10 and a pressure regulating valve 11;
the on-line cleaning bypass circulating system mainly comprises an inner cooling water tank 1, an RH ion exchanger water outlet on-line conductivity meter 8, an RH ion exchanger water outlet on-line pH meter 9, an RH ion exchanger water inlet flow meter 6, an RH ion exchanger 7, a RH ion exchanger water inlet valve 12 and an RH ion exchanger water outlet valve 13.
When the running state parameters such as stator wire rod temperature, inner cooling water flow and the like are abnormal, the running state is not improved well by variable flow water washing treatment, and the ion exchange slow-release micro-acidification online cleaning of the inner cooling water on the system can be considered.
The ion exchange slow-release micro-acidification online cleaning method comprises the following steps:
(1) stopping adding alkali, and preparing micro-acidification starting conditions:
stopping the alkali adding operation when the internal cooling water system normally operates;
collecting inner cooling water sample in a discontinuous sampling mode, and determining Cu in the inner cooling water2+Content (c);
when Cu is measured2+When the content was 100. mu.g/L, the RH ion exchanger was ready for operation.
(2) Putting into operation the RH ion exchanger 7, dissolving CuO by bypass circulation:
opening a water inlet valve 12 of the RH ion exchanger and a water outlet valve 13 of the RH ion exchanger, and controlling the bypass circulation processing flow to be 10% of the main circulation cooling flow through a pressure regulating valve 11;
monitoring the conductivity and pH of the effluent of the internal cold water and the RH ion exchanger in the ion exchange micro-acidification online cleaning process;
during the cleaning stabilization period, the pH (25 ℃) of the outlet water of the RH ion exchanger 7 is 5.86, the conductivity (25 ℃) is 0.548 mu S/cm, the pH (25 ℃) of the inner cooling water is stabilized at 6.42, and the conductivity (25 ℃) is 0.420 mu S/cm;
in the later period of cleaning, the pH value of the inner cooling water is gradually reduced, and the conductivity is gradually increased. When the CuO in the system is basically completely dissolved, the pH and the conductivity of the effluent of the internal cooling water and the RH ion exchanger are basically equal, namely the pH (25 ℃) is 5.86, and the conductivity (25 ℃) is 0.548 mu S/cm.
Example 2
A system for cleaning a hollow copper conductor failure passive film on line by ion exchange slow-release micro-acidification in a generator is shown in figure 1 and comprises a main circulating cooling system and an on-line cleaning bypass circulating system.
The main circulation cooling system mainly comprises an inner cooling water tank 1, an inner cooling water online conductivity meter 2, an inner cooling water online pH meter 3, an inner cooling water circulating pump 4, a stator winding 5, an inner cooling water sampling valve 10 and a pressure regulating valve 11;
the on-line cleaning bypass circulating system mainly comprises an inner cooling water tank 1, an RH ion exchanger water outlet on-line conductivity meter 8, an RH ion exchanger water outlet on-line pH meter 9, an RH ion exchanger water inlet flow meter 6, an RH ion exchanger 7, a RH ion exchanger water inlet valve 12 and an RH ion exchanger water outlet valve 13.
When the running state parameters such as stator wire rod temperature, inner cooling water flow and the like are abnormal, the running state is not improved well by variable flow water washing treatment, and the ion exchange slow-release micro-acidification online cleaning of the inner cooling water on the system can be considered.
The ion exchange slow-release micro-acidification online cleaning method comprises the following steps:
(1) stopping adding alkali, and preparing micro-acidification starting conditions:
stopping the alkali adding operation when the internal cooling water system normally operates;
collecting inner cooling water sample in a discontinuous sampling mode, and determining Cu in the inner cooling water2+Content (c);
when Cu is measured2+When the content was 349. mu.g/L, the RH ion exchanger was ready for operation.
(2) Putting into operation the RH ion exchanger 7, dissolving CuO by bypass circulation:
opening a water inlet valve 12 of the RH ion exchanger and a water outlet valve 13 of the RH ion exchanger, and controlling the bypass circulation processing flow to be 10% of the main circulation cooling flow through a pressure regulating valve 11;
monitoring the conductivity and pH of the effluent of the internal cold water and the RH ion exchanger in the ion exchange micro-acidification online cleaning process;
during the stable period of cleaning, the pH (25 ℃) of the outlet water of the RH ion exchanger 7 is 5.45, the conductivity (25 ℃) is 1.397 mu S/cm, the pH (25 ℃) of the inner cooling water is stable at 6.12, and the conductivity (25 ℃) is 1.374 mu S/cm;
in the later period of cleaning, the pH value of the inner cooling water is gradually reduced, and the conductivity is gradually increased. When the CuO in the system is basically completely dissolved, the pH and the conductivity of the effluent of the internal cooling water and the RH ion exchanger are basically equal, namely the pH (25 ℃) is 5.45, and the conductivity (25 ℃) is 1.397 mu S/cm.
Example 3
A system for cleaning a hollow copper conductor failure passive film on line by ion exchange slow-release micro-acidification in a generator is shown in figure 1 and comprises a main circulating cooling system and an on-line cleaning bypass circulating system.
The main circulation cooling system mainly comprises an inner cooling water tank 1, an inner cooling water online conductivity meter 2, an inner cooling water online pH meter 3, an inner cooling water circulating pump 4, a stator winding 5, an inner cooling water sampling valve 10 and a pressure regulating valve 11;
the on-line cleaning bypass circulating system mainly comprises an inner cooling water tank 1, an RH ion exchanger water outlet on-line conductivity meter 8, an RH ion exchanger water outlet on-line pH meter 9, an RH ion exchanger water inlet flow meter 6, an RH ion exchanger 7, a RH ion exchanger water inlet valve 12 and an RH ion exchanger water outlet valve 13.
When the running state parameters such as stator wire rod temperature, inner cooling water flow and the like are abnormal, the running state is not improved well by variable flow water washing treatment, and the ion exchange slow-release micro-acidification online cleaning of the inner cooling water on the system can be considered.
The ion exchange slow-release micro-acidification online cleaning method comprises the following steps:
(1) stopping adding alkali, and preparing micro-acidification starting conditions:
stopping the alkali adding operation when the internal cooling water system normally operates;
collecting inner cooling water sample in a discontinuous sampling mode, and determining Cu in the inner cooling water2+Content (c);
when Cu is measured2+At a content of 550. mu.g/L, the RH ion exchanger was ready for operation.
(2) Putting into operation the RH ion exchanger 7, dissolving CuO by bypass circulation:
opening a water inlet valve 12 of the RH ion exchanger and a water outlet valve 13 of the RH ion exchanger, and controlling the bypass circulation processing flow to be 10% of the main circulation cooling flow through a pressure regulating valve 11;
monitoring the conductivity and pH of the effluent of the internal cold water and the RH ion exchanger in the ion exchange micro-acidification online cleaning process;
during the stable period of cleaning, the pH (25 ℃) of the outlet water of the RH ion exchanger 7 is 5.35, the conductivity (25 ℃) is 1.781 mu S/cm, the pH (25 ℃) of the inner cooling water is stable at 6.04, and the conductivity (25 ℃) is 1.893 mu S/cm;
in the later period of cleaning, the pH value of the inner cooling water is gradually reduced, and the conductivity is gradually increased. When the CuO in the system is basically completely dissolved, the pH and the conductivity of the effluent of the internal cooling water and the RH ion exchanger are basically equal, namely the pH (25 ℃) is 5.35, and the conductivity (25 ℃) is 1.781 mu S/cm.

Claims (5)

1. An internal cooling water ion exchange slow-release micro-acidification flexible online cleaning method for a failure passivation film of a hollow copper conductor of a generator is characterized by comprising the following steps: regulating and controlling Cu in cold water in generator2+Introducing part of the cold water into RH ion exchanger in the bypass circulation treatment system to a certain concentration range, and slowly releasing H by using the ion exchanger+Micro-acidifying the inner cooling water to a certain pH range, and allowing the inner cooling water to enter a main circulation cooling system and then selectively dissolving the failure passivation film in the hollow copper conductor.
2. The internal cooling water ion exchange slow-release micro-acidification flexible online cleaning method for the hollow copper conductor failure passivation film of the generator according to claim 1, characterized in that: regulating and controlling Cu in cold water in generator2+The concentration is 100 mug/L-550 mug/L, the internal cooling water is led into an RH ion exchanger in a bypass circulation treatment system at the main circulation flow rate of 1% -10%, and the Cu in the internal cooling water is treated by the RH ion exchange resin2+Exchange for H+The pH value of the effluent is between 5.35 and 5.86.
3. The internal cooling water ion exchange slow-release micro-acidification flexible online cleaning method for the hollow copper conductor failure passivation film of the generator according to claim 1, characterized in that: and returning the outlet water of the RH ion exchanger to the internal cold water tank, slowly adjusting the pH value of the solution to 6.04-6.42 and the conductivity to 0.420-1.893 mu S/cm, introducing the slightly acidic solution in the internal cold water tank into a hollow copper conductor of the generator in the main circulation cooling system, and selectively dissolving the CuO serving as a passivation film with failure on the inner surface.
4. The internal cooling water ion exchange slow-release micro-acidification flexible online cleaning method for the hollow copper conductor failure passivation film of the generator according to claim 1, characterized in that: and the pH and the conductivity of the inlet water and the outlet water of the RH ion exchanger are monitored on line, and when the pH of the inlet water and the outlet water of the RH ion exchanger are close to the conductivity of the inlet water and the outlet water, the flexible on-line cleaning of the hollow copper conductor failure passivation film of the generator reaches the cleaning end point.
5. The use method of the system for cleaning the hollow copper wire failure passive film on line by ion exchange slow-release micro-acidification of the cold water in the generator is characterized in that the ion exchange slow-release micro-acidification on-line cleaning method comprises the following steps:
(1) stopping adding alkali, and preparing micro-acidification starting conditions:
stopping the alkali adding operation when the internal cooling water system normally operates;
collecting inner cooling water sample in a discontinuous sampling mode, and determining Cu in the inner cooling water2+Content (c);
when Cu is measured2+When the content is 100 mug/L-550 mug/L, preparing the RH ion exchanger for operation;
(2) putting into operation an RH ion exchanger, dissolving CuO by bypass circulation:
opening a water inlet valve of the RH ion exchanger and a water outlet valve of the RH ion exchanger, and controlling the bypass circulation processing flow to be 1% -10% of the main circulation cooling flow through a pressure regulating valve;
monitoring the conductivity and pH of the effluent of the internal cold water and the RH ion exchanger in the ion exchange micro-acidification online cleaning process;
during the stable period of cleaning, the pH value of the outlet water of the RH ion exchanger is 5.35-5.86, the pH value of the inner cooling water is stabilized at 6.04-6.42, and the electric conductivity is 0.420 mu S/cm-1.893 mu S/cm;
and in the later period of cleaning, the pH value of the inner cooling water is gradually reduced, the conductivity is gradually increased, and when the CuO in the system is basically completely dissolved, the pH value and the conductivity of the outlet water of the inner cooling water and the RH ion exchanger are basically equal.
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CN114934269B (en) * 2022-03-28 2023-05-16 武汉大学 Automatic regulating and controlling system and method for in-service passivation and acid washing of hollow copper conductor of generator
CN114959676B (en) * 2022-03-29 2023-05-16 武汉大学 In-service self-passivation system and method for cold water oxygenation reinforced hollow copper wire in generator
CN114774936B (en) * 2022-04-20 2023-04-07 武汉大学 Flexible acid pickling method for hollow copper conductor oxide of generator
CN114807953B (en) * 2022-04-20 2023-04-25 武汉大学 Pulse-flexible pickling system and method for corrosion products of hollow copper wires of generator

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