CN1328841C - Generator internal cold water qality treatment method and its device - Google Patents
Generator internal cold water qality treatment method and its device Download PDFInfo
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- CN1328841C CN1328841C CNB2004100218559A CN200410021855A CN1328841C CN 1328841 C CN1328841 C CN 1328841C CN B2004100218559 A CNB2004100218559 A CN B2004100218559A CN 200410021855 A CN200410021855 A CN 200410021855A CN 1328841 C CN1328841 C CN 1328841C
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Abstract
The present invention discloses a generator internal cooling circulation water qality treatment method and a device thereof. Particularly, oxygen and a palladium catalyst are injected into internal cooling circulation water to make the inner wall of a conducting wire form a protection layer of Cu2O when a generator begins operating. When the generator operates normally, the palladium catalyst keeps the concentration of the oxygen in the internal cooling circulation water at minute quantity and deposited copper is oxidized at once. Ion exchange resin is used to remove electrolytes including CO2, Cu+ and Cu2+ in the internal cooling circulation water so that the electric conductivity of the internal cooling circulation water is less than 2.0 mu s/cm. An alkali adding device adds alkali to the internal cooling circulation water automatically to regulate a pH value and make the pH value of the internal cooling circulation water keep from 8 to 9. The present invention guarantees the insulation level of the internal cooling circulation water and reduces the copper corrosion of the conducting wire and deposition in the mode of a maximum. The present invention is suitable for various large and medium generators which adopt water cooling.
Description
Technical field
The present invention relates to the water treatment method and the device thereof of large and medium-sized electric generator inner cooling recirculated water, belong to electromechanical engineering field.
Background technology
The stator of large and medium-sized generator or rotor coil normally adopt the high purity water cooling, and cooling water is recycling, airborne O
2, CO
2Can dissolve in cooling water, the pH value of cooling water is reduced, copper conductor can be corroded; And the matter Cu that produces electrolysis
+, Cu
2+With CuO, Cu
2The O sediment, especially at the non-metallic pipe of copper conductor with insulation aqueduct junction, redox potential is very high, and sediment is assembled especially severe; Sediment will make the circulation latus rectum of hollow copper conductor diminish, and the flow of cooling water diminishes, and temperature rise is increased, and especially metallic copper sediment conduction can make insulation property sharply reduce; Electrolyte will make the cooling electrical conductivity of water raise; Generator operation safety is jeopardized in the capital; Copper conductor corrosion and sediment will reduce exerting oneself of generator and useful life.
Up to now, most of power plant normally charge into nitrogen or hydrogen carries out air seal at cyclic water tank, with reduce airborne oxygen, carbon dioxide dissolves in cooling water, alleviates the corrosion of copper conductor; But the air-tightness of circulating water supply system can not be absolute tight, and airborne oxygen, carbon dioxide still can dissolve in cooling water; For a long time, the pH value of cooling water is on the low side, have in addition be acid, sediment and electrolyte exceed standard, in fact the water quality of cooling water is not taked any effective precautionary technology measure, have to take frequently to change the passive passive means of water, keep unit and normally move.
Have only a few power plant also to add corrosion inhibiter BTA in cooling water, form oxidation resistant diaphragm at hollow copper conductor inwall, but several shortcomings are arranged: 1, the thermal conductivity of diaphragm is lower, and cooling effect is not fine; 2, because corrosion inhibiter BTA is a weak electrolyte, not can be used for the characteristic parameter of online detection, can't control automatically, lean on the manual sampling analysis, manually add corrosion inhibiter, water quality parameter is difficult to remain in the scope of requirement; 3, the structural instability of diaphragm, intensity is low, and is fragile, needs often to add the corrosion inhibiter reparation.
In sum, the water quality of large and medium-sized electric generator inner cooling recirculated water is one of power plant's key technical problem anxious to be solved.
Summary of the invention
The present invention proposes a kind of new method, and the method does not have the defective of above-mentioned the whole bag of tricks, can make electric generator inner cooling circulation electrical conductivity of water very low, has good insulating properties; Can alleviate the corrosion of generator unit stator or rotor coil again to greatest extent.
Before this, it is conventionally believed that it is neutral that electric generator inner cooling recirculated water should be, and do not conform to oxygen, high purification does not contain other chemicals, and the copper corrosion of lead just can be low.The generator of countries in the world is to adopt neutral inner cold water substantially, and takes various technological means to make every effort to reduce oxygen content in the inner cold water as far as possible.
But further theoretical research and experiment show that the copper corrosion rate depends on the oxygen concentration and the pH value of water.If inject an amount of oxygen in cooling water, oxygen and copper reaction are at inwall formation one deck Cu of lead
2The O protective layer, the essence of copper corrosion is Cu
2The O protective layer is dissolved in solution, when oxygen concentration is 180-320 μ g/l, and copper corrosion rate maximum, along with the increase of pH value, rate of corrosion will reduce, and when pH value was 8.5, corrosion almost disappeared.Do not considering under the oxide layer condition that (oxygen concentration＜100 μ g/l) will form Cu under the suboxides reduction potential
2O, (oxygen concentration＞100 μ g/l) will form CuO under the high oxidation reduction potential.The solubility of cupric oxide depends on the chemical valence of pH value and copper, in PH＜8 o'clock, and Cu
2The solubility of O is more much lower than CuO, and along with the reduction of pH value, the solubility of cupric oxide will raise significantly, and pH value is between 8-9 the time, and the solubility of these two kinds of cupric oxide is all very low, and almost reaches consistent.When pH value＞9, under the room temperature, its solubility can raise again.With respect to the operating temperature of generator, best pH value should be 9.When having air, cooling water enters, because CO
2Influence, pH value will reduce, the copper corrosion degree increases, Cu
+And Cu
2+To increase, the solubility of cupric oxide also will raise thereupon; The simultaneous oxidation reduction potential also will raise, and this will form a large amount of ratio Cu
2The CuO that O solubility is high.If oxygen is to enter moment, oxygen can be consumed very soon, CO
2(through mixed bed) is released, and redox potential descends, and pH value will rise, and this will make the solubility of cupric oxide reduce, and produce sediment; The existing cupric oxide of sediment, metallic copper is arranged again, metallic copper is the crystal settling of separating out in the solution supersaturation of high interference district, mainly in the nonmetal insulated tube of copper conductor and insulation aqueduct junction, produce, therefore locate to be subjected to the interference of generator exciting curent, can produce very high electrical potential difference at the insulated tube two ends; The sedimentary conductivity of metallic copper will sharply reduce the insulation property of unit.
The present invention is based on above-mentioned further investigation to the copper conductor corrosion mechanism, propose a kind of and the water treatment method distinct electric generator inner cooling recirculated water of conventional method, the notable feature of this method is to make intercooling cycle water be in alkalescence+little oxygen condition.Water is alkalescence, can reduce CuO, Cu
2The solubility of O reduces corrosion; Keep little oxygen in the water, it is oxidized at once that the metallic copper of separating out is deposited under the effect of palladium catalyst, can avoid forming in the insulated tube metallic copper sediment conductive layer; This will both obtain low conductivity, guarantee insulation level, fundamentally eliminate the factor that generator coil is caused copper corrosion again, the corrosion that alleviates generator unit stator or rotor coil to greatest extent.
The water treatment method of this electric generator inner cooling recirculated water comprises step
(1) at the beginning of generator operation, inwardly inject oxygen and palladium catalyst in the cool circulation water, make the oxygen concentration＜32 μ g/l in the intercooling cycle water, at the inwall formation Cu of copper conductor
2The O protective layer;
(2) among the normal operation of generator, take following measure to make intercooling cycle electrical conductivity of water＜2.0 μ s/cm, and reduce copper corrosion and sediment formation to greatest extent;
-make oxygen concentration＜32 μ g/l in the intercooling cycle water with palladium catalyst, preferably remain between the 10-30 μ g/l;
-spent ion exchange resin is removed the CO in the intercooling cycle water
2, Cu
+And Cu
2+
-inwardly add alkali in the cool circulation water, the pH value of intercooling cycle water is remained between the 8-9, preferably remain between the 8.8-9.
Described ion exchange resin adopts OH type resin anion (R.A.) and the H type resin cation that does not contain the Cl ion.
The alkali that injects in the described inside cool circulation water is NaOH, or KOH, or NH
4OH.Add the method for alkali in the described inside cool circulation water, comprise step
-be lower than 8 when the pH value of major circulatory system inner cold water, during and conductivity＜1.5 μ s/cm, the measuring pump of bypass microcirculqtory system adder-subtractor is opened automatically, injects aqueous slkali to system;
-rise to 9 when the pH value of major circulatory system inner cold water, during or conductivity 〉=2.0 μ s/cm, stop measuring pump automatically;
Implement the treatment device for water of foregoing invention method, comprise the intercooling cycle water system, this system connects and composes closed loop in regular turn by water tank, water pump, cooler, filter, generator coil, also comprise a microcirculqtory system, this system is provided with ion-exchanger and adder-subtractor, the import of described ion-exchanger is communicated with the water inlet pipe of generator coil by pipeline, and its outlet is communicated with water tank by pipeline; Described adder-subtractor is communicated with connecting pipe between ion-exchanger and the water tank by pipeline.
Described adder-subtractor comprises lye tank, measuring pump, electrical control cubicles; The import of described measuring pump is connected with lye tank, and outlet is communicated with connecting pipe between ion-exchanger and the water tank; The upper wall of described lye tank is provided with respirator, and the air insulated agent is arranged in the respirator.
Described electrical control cubicles is provided with the control circuit of measuring pump, and this circuit comprises PLC, conductivity meter, PH meter, and PLC, conductivity meter, PH meter are formed the loop that electric conductivity of inside cold water, pH value are controlled automatically with measuring pump.
Described air insulated agent is a soda lime, or nitrogen, or barrier film, or molecular sieve.
Described lye tank is provided with liquid level indication and liquid automatic control device.
The invention has the beneficial effects as follows:
Owing in water, keep little oxygen, at the inwall formation Cu of copper conductor
2The O protective layer; And use palladium catalyst to make the metallic copper of separating out in the water oxidized at once, avoid in system, forming the sediment conductive layer; The electrolyte that produces at any time in the intercooling cycle water is removed in spent ion exchange resin continuous operation in the bypass microcirculqtory system; Inwardly add alkali in the cool circulation water, intercooling cycle water is alkalescence, and pH value remains between the 8-9, can reduce redox potential, alleviates copper corrosion.The comprehensive effect of above-mentioned technique effect is, both guaranteed the insulation level of intercooling cycle water, reduced the copper corrosion and the sedimentary formation of lead again to greatest extent, generator exert oneself and improve useful life, economic benefit, social benefit are huge.
Description of drawings
Fig. 1 is a system flow schematic diagram of the present invention.
Fig. 2 is an apparatus structure sketch of the present invention.
Embodiment
Below describe the present invention in detail, referring to Fig. 1, Fig. 2.
Existing electric generator inner cooling circulation connects and composes the closed cycle cooling system in regular turn by generator windings 1, water tank 2, water pump 3, cooler 4, filter 5, usually be filled with nitrogen or hydrogen separator 15 on the liquid level in the water tank 2, with air-isolation, avoid airborne CO
2, O
2Dissolve in the water.
The present invention has increased by a bypass microcirculqtory system on this basis, this system is made up of ion-exchanger 6 (the specialty address in the present technique field claims mixed bed usually) and adder-subtractor, the import of ion-exchanger 6 links to each other with the outlet of filter 5, and it exports joining water box 2; Connecting pipe between the outlet of adder-subtractor and ion-exchanger 6 and the water tank 2 is connected.The flow of the inner cold water of the bypass microcirculqtory system of flowing through remains on the 3-10% of total flow usually.
Ion-exchanger 6 filling ion exchange resin, resin anion (R.A.) adopts the OH type resin that does not contain the Cl ion, for example M500KR or IRA400 or SK-10A; Resin cation adopts H type resin, for example S100KR or IR-120 or SK-1B.
Adder-subtractor comprises lye tank 7, measuring pump 8 and electrical control cubicles 10 thereof; The import of measuring pump 8 is connected with lye tank 7, the outlet with ion-exchanger 6 and water tank 2 between connecting pipe be communicated with, the outlet of measuring pump 8 also is provided with check-valves, in case the cooling water of locking system pours in down a chimney into lye tank 7.The upper wall of lye tank 7 is provided with respirator 9, fills the air insulated agent in the respirator 9; The air insulated agent can be adopted soda lime, or nitrogen, or barrier film, or molecular sieve, and its effect is every high air, avoids airborne CO
2, O
2Dissolve in the alkali lye.Electrical control cubicles 10 can be provided with touch-screen 16, communication module and instrument for automatic control; Touch-screen 16 is set up man-machine interface, can edit out various pictures according to needs, in order to display device state, operation indication, parameter setting, motion flow, statistics, alarm news trouble, simple and easy form; Communication module is to realize transmitting data between PLC and master-control room DCS; Instrument for automatic control adopts PLC, conductivity meter, PH meter, and PLC, conductivity meter, PH meter are formed the loop that electric conductivity of inside cold water, pH value are controlled automatically with measuring pump.Wherein, the transducer 12 that is used for the transducer 11 of PH meter of automatically control and conductivity meter is located at the inlet pipeline of generator windings 1.The transducer 13 that is used to detect the conductivity meter of demonstration is located at the outlet conduit of ion-exchanger 6, and its effect is a treatment effect of judging high sub-interchanger 6, determines to change the time of resin; The transducer 14 of conductivity meter is located on the conjoint outlet pipeline of ion-exchanger 6 and measuring pump 8, and its effect is the resultant effect after judging ion-exchange and adding alkali, to determine to add the amount of alkali.The signal that the transducer 11,12 of conductivity meter, PH meter is gathered is sent into PLC by signal cable and is handled, PLC sends 8 unlatchings of control signal control measuring pump or stops, realize regulating automatically the purpose of conductivity meter, pH value, DCS (Distributed Control System) communication contact of PLC and generator master control chamber.In addition, the signal that all the sensors is gathered also shows at master-control room and electrical control cubicles 10 respectively, is convenient to operating personnel and understands the water quality situation at any time.
Contain the weak solution of alkali in the lye tank 7, alkali can be used NaOH, or KOH, or NH
4The alkali that OH etc. industry is commonly used, but preferably use the NaOH of very economical.Lye tank 7 itself preferably is provided with the liquid automatic control device.Adding alkali in cooling water, is in order to improve the pH value of cooling water.
Be necessary explanation, in cooling water, add alkali and also have other technological means that for example, the filling ionic forms is Na, K, NH in above-mentioned ion-exchanger 6
4, or the H type monovalent cation resin of Li type, the alkaline matter that utilizes its slowly-releasing to go out improves the pH value of cooling water.But this means that whole microcirculqtory system will be included in the automatic control system, start continually, stop.Shortcoming is: for slowly-releasing goes out basic species, resin must maintain certain proportion, this be do not allow facile.The effect of resin mainly is to eliminate electrolyte, and adding alkali is in order to improve the pH value of cooling water, the very difficult requirement of satisfying two-parameter (conductivity and pH value) adjusting simultaneously of the total amount of resin and ratio; And the amount that resin slow-release goes out basic species changes, and along with extending service time and reducing gradually, promptly regulates parameter and controlled variable all to change; This will add to the difficulties to design of automatic control system and operation; Simultaneously, for the ion exchange resin that goes out basic species by slowly-releasing, its response speed is curtain very, and self-regulating lag time is long, and the effect of adjusting is not fine.Therefore, preferably adopt the method that adds alkali separately.
The course of work of the water treatment method of this electric generator inner cooling recirculated water may further comprise the steps:
1. at the beginning of generator operation, inwardly inject an amount of oxygen and palladium catalyst in the cool circulation water, make the oxygen concentration＜32 μ g/l in the intercooling cycle water, the effect of palladium catalyst is oxygen to be dissolved in rapidly in the water react with copper, at the inwall formation Cu of copper conductor
2The O protective layer; By preceding theory analysis as can be known, when oxygen be moment trace enter, with metallic copper reaction, can be consumed very soon, and can not be free in the water.Oxygen and palladium catalyst can add from the inlet of water tank 2.
2. among the normal operation of generator, take following measure to make intercooling cycle electrical conductivity of water＜2.0 μ s/cm, and reduce the copper corrosion and the sedimentary formation of lead to greatest extent.
-make the oxygen concentration in the intercooling cycle water answer＜32 μ g/l with palladium catalyst, preferably remain between the 10-30 μ g/l;
-spent ion exchange resin is removed the electrolyte CO in the intercooling cycle water
2, Cu
+And Cu
2+
-inwardly add alkali in the cool circulation water, the pH value of intercooling cycle water is remained between the 8-9, preferably remain between the 8.8-9, the concentration of alkali in water to satisfy alkali metal ion for example Na content be 70-250 μ g/l.
The basic goal of water treatment is that the intercooling cycle electrical conductivity of water is met the requirements, and reduces the corrosion and the sedimentary formation of lead on this basis as far as possible, and above-mentioned three technology measure integrated use can reach this purpose preferably.
Because the intercooling cycle system structurally can not be absolute tight, air always enters the intercooling cycle system.Airborne CO
2.O
2Be dissolved in water, this is the major reason that causes water quality to degenerate, CO
2To make the pH value of water reduce O
2Concentration too high (should not surpass 100 μ g/l) will strengthen the copper corrosion rate of lead; Copper corrosion can produce conductive ion Cu
+And Cu
2+, and CuO, Cu
2O and metallic copper precipitation, Cu
+And Cu
2+Make electrical conductivity of water raise decreasing insulating with the conductivity of metallic copper precipitation; Precipitation will be stopped up the water route, and its latus rectum is diminished, and the flow of cooling water diminishes, and the temperature rise of coil is increased; These all will jeopardize the safety of generator; The copper corrosion of lead also can reduce exerting oneself and useful life of generator.
With palladium catalyst the oxygen concentration in the intercooling cycle water being remained between the 10-30 μ g/l, is to make the metallic copper of separating out in the water oxidized at once, avoids forming in system conductive layer.
Spent ion exchange resin continuous operation in the bypass microcirculqtory system can be removed the electrolyte CO for example in the intercooling cycle water at any time
2, Cu
+And Cu
2+
Inwardly add alkali in the cool circulation water, the pH value of intercooling cycle water is remained between the 8-9, intercooling cycle water is alkalescence, can reduce redox potential, alleviates copper corrosion and sedimentary formation; But pH value is not high more good more, and general pH value should not surpass 9, and pH value was greater than 9 o'clock, and solubility will raise, and can aggravate corrosion again.
Inwardly add alkali in the cool circulation water and carry out automatically, comprise step by automatic control system
The signal that the transducer 12,11 of-conductivity meter, PH meter is gathered is sent into PLC by signal cable, compare with predefined set-point, when the pH value of major circulatory system inner cold water is lower than 8, and during conductivity＜1.5 μ s/cm, PLC sends instruction, the measuring pump 8 of bypass microcirculqtory system adder-subtractor is opened automatically, injects aqueous slkali to system;
-rise to 9 when the pH value of major circulatory system inner cold water, during or conductivity 〉=2.0 μ s/cm, PLC sends instruction, stops measuring pump 8 automatically.
In above-mentioned steps, conductivity and pH value are carried out On-line Control as characteristic parameter, can take the method inspected by random samples to oxygen concentration, regularly detect the oxygen concentration in the water, replenish an amount of palladium catalyst again, oxygen content is remained in the scope of requirement.
Claims (10)
1. the water treatment method of an electric generator inner cooling recirculated water comprises step
(1) at the beginning of generator operation, inwardly inject oxygen and palladium catalyst in the cool circulation water, the oxygen concentration in the intercooling cycle water＜32 μ g/l makes the inwall of copper conductor form Cu
2The O protective layer;
(2) among the normal operation of generator, take following measure to make intercooling cycle electrical conductivity of water＜2.0 μ s/cm, and reduce copper corrosion and sediment formation to greatest extent;
-make oxygen concentration＜32 μ g/l in the intercooling cycle water with palladium catalyst;
-spent ion exchange resin is removed the CO in the intercooling cycle water
2, Cu
+And Cu
2+
-inwardly add alkali in the cool circulation water, the pH value of intercooling cycle water is remained between the 8-9.
2. water treatment method according to claim 1 is characterized in that: the oxygen concentration in the described intercooling cycle water remains between the 10-30 μ g/l; The pH value of described intercooling cycle water remains between the 8.8-9.
3. water treatment method according to claim 1 is characterized in that: described ion exchange resin adopts OH type resin anion (R.A.) and the H type resin cation that does not contain the Cl ion.
4. water treatment method according to claim 1 is characterized in that: the alkali that injects in the described inside cool circulation water is NaOH, or KOH, or NH
4OH.
5. water treatment method according to claim 1 is characterized in that: add the method for alkali in the described inside cool circulation water, comprise step
-be lower than 8 when the pH value of major circulatory system inner cold water, during and conductivity＜1.5 μ s/cm, the measuring pump of bypass microcirculqtory system adder-subtractor is opened automatically, injects aqueous slkali to system;
-rise to 9 when the pH value of major circulatory system inner cold water, during or conductivity 〉=2.0 μ s/cm, stop measuring pump automatically.
6. implement the treatment device for water of the described method of claim 1, comprise the intercooling cycle water system, this system connects and composes closed loop in regular turn by water tank, water pump, cooler, filter, generator coil, it is characterized in that: also comprise a microcirculqtory system, this system is provided with ion-exchanger and adder-subtractor, the import of described ion-exchanger is communicated with the water inlet pipe of generator coil by pipeline, and its outlet is communicated with water tank by pipeline; Described adder-subtractor is communicated with connecting pipe between ion-exchanger and the water tank by pipeline.
7. treatment device for water according to claim 6 is characterized in that: described adder-subtractor comprises lye tank, measuring pump, electrical control cubicles; The import of described measuring pump is connected with lye tank, and outlet is communicated with connecting pipe between ion-exchanger and the water tank; The upper wall of described lye tank is provided with respirator, and the air insulated agent is arranged in the respirator.
8. treatment device for water according to claim 7, it is characterized in that: described electrical control cubicles is provided with the control circuit of measuring pump, this circuit comprises PLC, conductivity meter, PH meter, and PLC, conductivity meter, PH meter are formed the loop that electric conductivity of inside cold water, pH value are controlled automatically with measuring pump.
9. treatment device for water according to claim 7 is characterized in that: described air insulated agent is a soda lime, or nitrogen, or barrier film, or molecular sieve.
10. treatment device for water according to claim 7 is characterized in that: described lye tank is provided with liquid level indication and liquid automatic control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100218559A CN1328841C (en) | 2004-02-17 | 2004-02-17 | Generator internal cold water qality treatment method and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100218559A CN1328841C (en) | 2004-02-17 | 2004-02-17 | Generator internal cold water qality treatment method and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1560984A CN1560984A (en) | 2005-01-05 |
| CN1328841C true CN1328841C (en) | 2007-07-25 |
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ID=34440874
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|---|---|---|---|
| CNB2004100218559A Expired - Fee Related CN1328841C (en) | 2004-02-17 | 2004-02-17 | Generator internal cold water qality treatment method and its device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170195A (en) * | 2011-04-29 | 2011-08-31 | 山西省电力公司电力科学研究院 | Method for treating stator cooling water of generator |
| CN102432133A (en) * | 2011-12-15 | 2012-05-02 | 宁夏电力公司电力科学研究院 | Automatic alkalization treatment device for inner cooling water of power plant |
| CN110375195A (en) * | 2019-05-31 | 2019-10-25 | 浙江大唐国际绍兴江滨热电有限责任公司 | A kind of generator hydrogen method of replacing |
| CN111682702A (en) * | 2020-06-24 | 2020-09-18 | 中国神华能源股份有限公司国华电力分公司 | Generator stator cooling water system |
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