KR20150084475A - An Apparatus for reducing impurity inflow and removing impurities in stator cooling water - Google Patents

An Apparatus for reducing impurity inflow and removing impurities in stator cooling water Download PDF

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Publication number
KR20150084475A
KR20150084475A KR1020140004545A KR20140004545A KR20150084475A KR 20150084475 A KR20150084475 A KR 20150084475A KR 1020140004545 A KR1020140004545 A KR 1020140004545A KR 20140004545 A KR20140004545 A KR 20140004545A KR 20150084475 A KR20150084475 A KR 20150084475A
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South Korea
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washing water
cooling water
water
impurities
water tank
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KR1020140004545A
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Korean (ko)
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이태원
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이태원
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Abstract

The present invention relates to a method for suppressing the inflow of impurities in cooling water through air and removing impurities from the cooling water in a large capacity generator using water for cooling a stator winding and, more particularly, to a method for removing granular impurities of the air by a filter, removing gas impurities by using an absorbent, and removing ionic impurities included in the cooling water by using an electrodeionization (EDI) system. The present invention includes the filter, an absorption tower, the EDI system, a cleaning water supply electric valve, an electrical conductivity sensor, a cleaning water discharge electric valve, a cleaning water tank, a cleaning water level sensor, a cleaning water circulation pump, a DC supply device, and a controller.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a stator cooling water,

Failure to remove the heat from the generator windings in operation can lead to serious accidents where the conductor or iron core melts in severe cases. Therefore, coolants such as air, water, and hydrogen are used in the generator to remove heat. Among them, water has excellent heat absorbing ability, and in large capacity generators for today's power generation, water is mostly used for cooling the stator coils. Teflon hoses are used for electrical insulation between the cooling water supply system and stator windings in generators using water. If the electrical conductivity of the water (cooling water) flowing in the Teflon hose is high, the leakage current through the Teflon hose may increase, leading to grounding accidents. Therefore, the electrical conductivity should always be kept low (10uS / cm or less). In the present power plant, impurities in the cooling water are continuously removed by using a deionizer containing a mixture of a small size (H + ) cation exchange resin and a hydroxide ion (OH - ) anion exchange resin. Ion exchange resins used in desalination systems have limited performance and should be replaced when performance is good. Generally, in the power plant, the ion exchange resin is replaced during the regular maintenance of the generator. However, when the performance of the ion exchange resin comes early due to the increase of the amount of impurities in the cooling water during operation, the power generation should be stopped and the ion exchange resin should be replaced.

On the other hand, in order to suppress the corrosion of the copper material (winding) in contact with water, the concentration of dissolved oxygen in the cooling water should be kept high (2 ppm or more). If the concentration of dissolved oxygen in the cooling water is lowered (less than 1ppm), corrosion of the copper material increases rapidly, so that the corrosion product adheres to the wall of the cooling water channel or is caught by the filter and blocks the flow of cooling water, Must be removed. In order to maintain the dissolved oxygen concentration in the cooling water at a high level, air is introduced into the space above the stator cooling water tank from the outside, and air (oxygen) is dissolved into the cooling water through contact between the cooling water and the air. When the impurities (carbon dioxide (CO 2 ), sulfur oxide (SO 2 ), nitrogen oxide (NO 2 ), salt (NaCl), dust, etc.) contained in the air are contained in the air, the electric conductivity of the cooling water is increased do. Therefore, it is necessary to minimize the impurities entering into the cooling water by removing the impurities contained in the air in contact with the cooling water in advance.

In order to maintain the dissolved oxygen concentration in the cooling water of the generator stator to be high (2 ppm or more), air should always flow into the upper part of the tank through the stator cooling water tank exhaust pipe and contact with the cooling water. The air contains impurities such as salt, carbon dioxide (CO 2 ), sulfur oxides (SO 2 ) and nitrogen oxides (NO 2 ), but it can remove impurities in the air supplied to the generator stator cooling water system There is no facility, and impurities contained in the air dissolve in the cooling water when the air is introduced, thereby increasing the electric conductivity of the cooling water and shortening the period of use of the deionizer for removing impurities in the cooling water. When gaseous substances such as carbon dioxide (CO 2 ), sulfur oxide (SO 2 ), and nitrogen oxide (NO 2 ) contained in the air and salt (NaCl) are dissolved in water, they are ionized by the following reaction, The electric conductivity of the electrode is increased.

CO 2 + H 2 O -> H 2 CO 3 -> H + + HCO 3 - Equation 1

SO 2 + H 2 O -> H 2 SO 3 -> H + + HSO 3 - Equation 2

NO 2 + H 2 O -> HNO 3 -> H + + NO 3 - Equation 3

NaCl -> Na + + Cl - Equation 4

In the generator stator cooling system, a desalination device is installed to remove ionic impurities from the supply or from the air or from the corrosion of the stator cooling system. The desalination unit contains mixed (H + ) cation exchange resin and anhydrous (OH - )) anion exchange resin to remove ion phase (cation and anion) impurities in the circulating cooling water. When positive ions ("+" charged particles, eg Na + ) in the cooling water meet with the hydroponic cation exchange resin (RH), the cations stick to the cation exchange resin,

RH + Na-> R-Na + H + Equation 5

Anions in the cooling water (eg, "charged particles" such as HCO 3 - ), when they come in contact with the hydroxide ion-type cation exchange resin (R-OH), separate the hydroxide ion as the anion adheres to the anion exchange resin.

R - OH + HCO 3 - -> R - HCO 3 + OH - Equation 6

In this case, the separated hydrogen ion (H + ) and the hydroxide ion (OH - ) are combined to form water, and water has a very low ionicity (ability to be ionized) The material is removed and the electrical conductivity is lowered. If the ion exchange resin loses its exchange capacity (saturates), the ion exchange resin should be replaced. Generally, in the power plant, the ion exchange resin is replaced at the regular maintenance of the generator. However, if the ion exchange resin performance becomes early due to the increase in the amount of impurities in the cooling water, the power generation should be stopped and the ion exchange resin must be replaced. The maintenance cost is increased.

US Patent, US 6572777 B1 "Method for purifying the cooling circuit of an alternator stator operating in a ventilated circuit & US Patent, US 6514398 B2 "Electrodeionization apparatus and method"

"Chemistry-Related monitoring of generator cooling water systems", Power Plant Chemistry, 2011, 13 (3) "Operation and maintenance of large turbo-generators", Geoff Klempner, Isidor Kerszenbaum, IEEE,

The present invention has been devised to continuously use an ion exchange resin of a desalination device for suppressing impurities introduced into the generator stator cooling water through the air and removing impurities contained in the circulating cooling water without periodically replacing the ion exchange resin. (Dust, salt, etc.) in the air flowing into the upper portion of the generator stator cooling water tank is removed using a filter, and gaseous impurities such as carbon dioxide gas, sulfur oxide, nitrogen oxide and the like are removed using an absorption tower containing an alkali absorbent (EDI) which continuously regenerates the ion exchange resin electrically. The present invention also relates to a method for removing ionic impurities dissolved in circulating cooling water using an electrodeposition device (EDI) which continuously regenerates ion exchange resin electrically.

Gaseous impurities such as carbon dioxide, sulfur oxides, nitrogen oxides and the like contained in air are removed by the following reaction when they come into contact with an absorbent mainly composed of sodium hydroxide.

CO 2 + 2 NaOH -> Na 2 CO 3 + H 2 O Equation 8

SO 2 + 2 NaOH -> Na 2 SO 3 + H 2 O Equation 9

2NO 2 + 2NaOH -> NaNO 2 + NaNO 3 + H 2 O Equation 10

Absorbing column The absorbent should be replaced when its performance is good.

On the other hand, the impurities dissolved in the circulating cooling water are subjected to electrodeposition (EDI), which can continuously remove impurities in the water without replacing the ion exchange resin so that the ion exchange resin can be continuously regenerated during use by using electricity, Can be applied. Fig. 1 schematically shows the principle of the electrodeposition apparatus. Anion film 6 for passing only negative ions is disposed on the anode side between the anode 5 and the cathode 7 and a cation film 8 for passing only positive ions is disposed on the cathode side. And the cation membrane (8) are filled with a mixture of the cation exchange resin (3) and the anion exchange resin (4). Water (hereinafter referred to as " treated water ") containing impurities flows through the mixed resin layer through the treated water pipe 1, and water is passed between the negative electrode and the anion membrane and between the positive electrode and the cation membrane through the washing water pipe 2 The impurities in the treated water flowing through the mixed resin layer react with the ion exchange resin to remove impurities as shown in Equation 5 and Equation 6, when DC voltage is applied between the anode 5 and the cathode 7 while flowing. On the other hand, in the cathode and the anode, the washing water is decomposed by an electrical action to generate hydrogen ions and hydroxide ions.

H 2 O -> H + + OH - Equation 11

The hydrogen ion (H + ) generated in the cathode moves through the cation membrane to the treated water side by the action of the anode (the positively charged cation is attracted toward the cathode by the electric action), and the hydroxide ion generated in the anode passes through the anion membrane It enters the water side. The hydrogen ion and the hydroxide ion introduced into the treated water respectively react with cation exchange resin adhered with cation impurities and anion exchange resin adhered with anion impurities to separate cation impurities and anion impurities. The separated cation passes through the cation membrane through the cation membrane and escapes to the cathode side due to the electrical action of the cathode, and the anion passes through the anion membrane by the electrical action of the anode and is discharged to the anode side. As the process repeats, the impurities in the treated water are removed, and the anion exchange resin and the cation exchange resin always maintain the ion exchange performance, so that the ion exchange resin can be used over a long period of time without replacement.

The present invention has the following means in order to realize the above object.

The method for suppressing and removing impurities in generator stator cooling water according to the present invention includes a filter 31 for removing particulate impurities in the air injected into a generator stator cooling water tank, an absorption tower 32 for removing gaseous impurities, an electric desalination unit 34, A power supply device 33 for supplying DC power to the electrodemetation device, a cleaning water supply electric valve 37 for supplying cleaning water to the anode and the cathode side of the electrolytic desalination device, a cleaning water discharge electric valve The washing water circulating pump 38, the washing water tank 40 for storing the washing water, the electric conductivity sensors 19a, 19b and 19c for measuring the electric conductivity of the treated water and the washing water, the washing water tank level 39, And a controller 36 for controlling the washing water supply electric valve 37 and the washing water discharge electric valve 39 in accordance with the electric current and voltage of the electric desalination device and the electric conductivity of the treated water .

The present invention relates to a means for suppressing impurities introduced into a generator stator cooling water and for enabling stable operation of the generator so as to be continuously usable without periodically replacing the ion exchange resin of the desalination device for removing impurities in the circulating cooling water to provide.

In addition, the present invention provides an effect of preventing power generation from stopping for replacement of the ion exchange resin due to an increase in the electric conductivity due to premature performance depletion of the cooling system detergent of the generator stator during operation.

In addition, the present invention has the effect of reducing the cost of purchasing the ion exchange resin and the labor cost of replacing the periodic ion exchange resin in the demineralizer of the cooling system of the generator stator.

1 is a principle diagram of an electrodeposition apparatus.
2 is a system diagram of a conventional large capacity generator stator cooling water.
3 is a system diagram of a large capacity generator stator cooling water of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a system diagram of a conventional large capacity generator stator cooling water.

FIG. 1 shows the structure of a large-capacity generator stator cooling water system.

The cooling water in the cooling water tank 21 enters the cooler 30 through the cooling water pumps 28a and 28b and partly enters the desalination device 26 through the treatment water inlet pipe 27 to remove impurities from the treated water And returns to the cooling water tank 21 through the outlet pipe 29. The electrical conductivity of the inlet and outlet water of the desalination unit 26 is monitored by the electrical conductivity meters 19a and 19b. The cooling water that has passed through the cooler 30 absorbs heat while passing through the generator stator winding 25 and returns to the cooling water tank 21 through the cooling water recovery pipe 24. At this time, the air injected through the air injection pipe 23 is lifted up through the vacuum break pipe 22 installed to break the vacuum generated in the cooling water return pipe 24, and is mixed with the stator outlet cooling water to be supplied to the cooling water tank 21, And then collected in the upper space of the cooling water tank and discharged to the outside through the exhaust pipe (20). Oxygen is dissolved into the cooling water through the contact between the cooling water and air while repeating this circulation process.

2 is a block diagram of a method for suppressing and eliminating the inflow of impurities of a cooling water of a generator stator according to the present invention.

1, a filter 31 for removing particulate impurities in the air injected into the air injection pipe 23 of the present invention, An electric desalination device 34 for removing impurities in the cooling water in place of the desalination device 26 of FIG. 1 in the treated water pipe 27, an electric desalination device 34 for removing gas impurities, A DC voltage supply device 33 for supplying a voltage, a cleaning water supply electric valve 37 for supplying water for removing impurity ions that have escaped to the electrodes (anode and cathode) side, a cleaning water discharge electric valve A washing water tank 40 for storing washing water, a washing water circulating pump 38 for circulating the washing water, electric conductivity sensors 19a, 19b and 19c for measuring electric conductivity of the treated water and washing water, , Measuring the level of the washing water tank A controller 36 for controlling the washing water supply electric valve 37 and the washing water discharge electric valve 39 in accordance with the electric current and voltage of the electric desalination device and the electric conductivity of the treated water, To suppress impurities flowing into the stator cooling water and to remove impurities in the cooling water.

The air enters the filter 31 through the air inlet pipe 23 to remove particulate impurities and then enters the absorption tower 32 to remove gaseous impurities and enters the upper part of the cooling water tank 21 to be in contact with the cooling water and dissolve in the cooling water .

The treated water enters the electrolytic desalination unit 34 through the treatment water inlet pipe 27, passes through the treated water outlet pipe 29 after the ionic impurities are removed, and enters the cooling water tank 21.

The controller 36 receives a signal from the electric conductivity sensors 19a and 19b that monitor the electric conductivity of the number of the electric desalination device outlets and issues an alarm when the electric conductivity of the number of outlets is equal to or higher than the number of inputs When a signal from the electric conductivity sensor 19c of the circulating washing water is received and the electric conductivity of the washing water exceeds a previously inputted reference value, the washing water discharge valve is opened to discharge the washing water, and the washing water tank level sensor 41 The washing water supply electric valve 37 is opened to supply the washing water. If the washing water tank water level is higher than the reference value, the washing water supply electric valve is closed and the washing water Minimize consumption.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made without departing from the essential characteristics of the present invention by those skilled in the art.

Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

1: treated water inlet 2: washing water inlet 3: cation exchange resin
4: anion exchange resin 5: anode 6: anion membrane
7: cathode 8: cation membrane 9: cleansing water outlet
10: treated water outlet 19a, 19b, 19c: electric conductivity sensor 20: exhaust pipe
21: cooling water tank 22: vacuum break tube 23: air injection tube
24: cooling water recovery pipe 25: stator winding 26: desalination device
27: treated water inlet piping 28a, 28b: cooling water pump 29: treated water outlet piping
30: cooler 31: filter 32: absorption tower
33: DC voltage supply device 34: Electrical desalination device 35: Cleaning water inlet piping
36: controller 37: rinsing water supply electric valve 38: rinsing water circulation pump
39: discharging washing water Electric valve 40: rinse water tank 41: rinse water tank level sensor

Claims (3)

A method for suppressing impurities flowing through air injected into a stator cooling water system from a large capacity generator and removing impurities dissolved in the cooling water,
A filter (31) for removing particulate impurities in the air flowing into the generator stator cooling water tank;
An absorption tower (32) filled with an absorbent to absorb and remove gaseous impurities in the air flowing into the generator stator cooling water tank;
An electric desalination device (34) for removing ionic impurities contained in the generator stator cooling water;
A cleaning water supply electric valve 37 for supplying cleaning water;
Electrical conductivity sensors (19a, 19b, 19c) for measuring the inlet and outlet treated water and the electrical conductivity of the washing water;
A washing water discharge electric valve (39) for discharging washing water;
A washing water tank 40 for storing wash water;
A washing water level sensor 41 for measuring the washing water tank level;
A circulating water circulating pump 38 for circulating the washing water,
A direct current power supply device 33 for supplying a direct current source to the electrodemetration device 34;
The electric conductivity of the electrolytic desalination device 34 is monitored, and when the electric conductivity is higher or lower than the reference value, an alarm is issued, the electric conduction of the washing water and the washing water tank level are monitored, And a controller (36) for controlling the washing water discharge valve (39). The method according to claim 1,
A generator stator cooling water tank, comprising an absorption tower (32) filled with an alkali absorbent to remove gaseous impurities in the air to be injected into the generator stator cooling water tank. The method according to claim 1,
A pump 38 for circulating the washing water in the electric desalination device 34, an electric conductivity sensor 19c for measuring the electric conductivity of the washing water, an electric valve 37 for supplying the washing water, A valve 39 and a water level sensor 41 for the washing water tank 40 so as to discharge and supply the washing water according to the electric conductivity of the washing water and the washing water tank level, An impurity inflow inhibiting and removing device.
KR1020140004545A 2014-01-13 2014-01-13 An Apparatus for reducing impurity inflow and removing impurities in stator cooling water KR20150084475A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101837174B1 (en) * 2017-11-27 2018-03-09 임한귀 Cooling and Circulation Cleaning System for Generator Stator Coil
CN109217565A (en) * 2018-10-29 2019-01-15 哈尔滨理工大学 A kind of large size phase modifier hydrologic cycle cooling system
CN110033678A (en) * 2019-04-22 2019-07-19 中广核核电运营有限公司 Water-cooled generator stator model
CN114455674A (en) * 2022-02-15 2022-05-10 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Indirect cooling water treatment equipment for thermal power plant and treatment method thereof
KR102613833B1 (en) 2023-05-23 2023-12-14 주식회사 와이엠테크 Generator internal cleaning device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101837174B1 (en) * 2017-11-27 2018-03-09 임한귀 Cooling and Circulation Cleaning System for Generator Stator Coil
CN109217565A (en) * 2018-10-29 2019-01-15 哈尔滨理工大学 A kind of large size phase modifier hydrologic cycle cooling system
CN110033678A (en) * 2019-04-22 2019-07-19 中广核核电运营有限公司 Water-cooled generator stator model
CN110033678B (en) * 2019-04-22 2021-11-09 中广核核电运营有限公司 Internal water cooling generator stator model
CN114455674A (en) * 2022-02-15 2022-05-10 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Indirect cooling water treatment equipment for thermal power plant and treatment method thereof
KR102613833B1 (en) 2023-05-23 2023-12-14 주식회사 와이엠테크 Generator internal cleaning device

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