CN1126231C - Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system - Google Patents
Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system Download PDFInfo
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- CN1126231C CN1126231C CN 01138300 CN01138300A CN1126231C CN 1126231 C CN1126231 C CN 1126231C CN 01138300 CN01138300 CN 01138300 CN 01138300 A CN01138300 A CN 01138300A CN 1126231 C CN1126231 C CN 1126231C
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Abstract
The present invention discloses an inner cooling water microcirculation slowly-releasing regulation and control method for large-sized generators and a monitoring system thereof, which is suitable for large-sized generator sets in thermal power stations, nuclear power stations and hydraulic power stations. In the method, when the PH value and the electric conductivity of inner cooling water in a circulation system are less than a certain value, the inlet valve and the outlet valve of a small mixed bed are started to make part of the inner cooling water pass through a bypass circulation system for a microcirculation, and thus, a small amount of alkaline matter which is slowly released by the small mixed bed is carried an inner cooling water tank, and the PH value and the electric conductivity of the inner cooling water are controlled within a range; when the PH value and the electric conductivity of the inner cooling water in the circulation system reach a certain value, the inlet valve and the outlet valves are closed; when the values are in certain value, a drainage valve and a water compensation valve of desalinated water in the inner cooling water tank are simultaneously opened until the electric conductivity of the inner cooling water is less than a certain value. The alkaline matter is composed of negative type of resin and positve type of resin. The monitoring system of the inner cooling water microcirculation slowly-releasing regulation and control method is composed of a water quality monitoring control system for the inner cooling water, a bypass circulation processing control system and a water compensation pollution discharging control system. The present invention can effectively prevent the deterioration of the water quality of the inner cooling water, inhibit the corrosion of the hollow copper conducting wire of a generator and guarantee the safety of the generator and economic operation.
Description
Technical field:
The present invention relates to a kind of inner-cooling water microcirculation slowly-releasing regulation and control method and supervisory control system thereof, belong to the electrical engineering field.
Background technology:
What the stator winding of high-rating generators such as thermal power plant, nuclear power station turbo generator, hydroelectric station hydraulic generator and the rotor winding of double water innercooling electric generator adopted is high purity water circulation cooling, its cooling water quality is subjected to oxygen and carbon dioxide pollution in the air and worsens, thereby causes the hollow copper conductor to corrode.At present, the means of defence of taking usually be cooling water tank with nitrogen or hydrogen sealing and to inner cold water add MBT or corrosion inhibiter such as BTA and derivative thereof (see " generator coolant ", hydraulic and electric engineering publishing house, November nineteen ninety-five front page).Because the air-tightness of the inner cold water circulatory system and make-up water pipeline thereof is difficult to be guaranteed, thus carry out method seldom employing in engineering practice of air seal with nitrogen or hydrogen, and there is potential safety hazard in the use of hydrogen.The method of adding corrosion inhibiter such as BTA is comparatively commonly used, but still has many shortcomings, and its subject matter is: 1, add and its residual concentration in system of manual sampling analyzing and testing by artificial; 2, used corrosion inhibiter is a weak electrolyte, and neither one is suitable for the characteristic parameter of online detection, does not fit into automatic control; 3, used corrosion inhibiter is the organic substance that contains benzene ring structure, and formed diaphragm thermal resistance is bigger, is unfavorable for the cooling heat dissipation of generator copper conductor winding; 4, need often manually to add medicament to repair diaphragm.In fact, at present a lot of power plant do not take any adjusting control measure to the inner cold water of generator, the pH value of inner cold water is on the low side for a long time, Cu content often exceeds standard, it is qualified to adopt the method for frequently changing water to keep conductivity, this method had not both solved the etching problem of copper conductor, had wasted a lot of high purity waters simultaneously again.The inner cold water quality problem becomes one of generator potential safety hazard, and has limited exerting oneself of generator.
Summary of the invention:
The purpose of this invention is to provide a kind of inner-cooling water microcirculation slowly-releasing regulation and control method and supervisory control system thereof, under the condition that has dissolved oxygen to exist, prevent that effectively the hollow copper conductor from corroding.
Technical scheme of the present invention is achieved in that
A kind of inner-cooling water microcirculation slowly-releasing regulation and control method of the present invention, it comprises following monitor procedure: A, when the pH of major circulatory system inner cold water value is lower than 7.5 and conductivity＜3.0 μ S/cm, the little mixed bed terminal valve of opening the bypass circuit system carries out microcirculation, and the micro-alkaline matter that allows little mixed bed slowly-releasing go out enters the inner cold water case; B, when the pH of major circulatory system inner cold water value rises to 8.5 and conductivity when being no more than 3.0 μ S/cm, close the terminal valve of the little mixed bed of bypass circuit system; C, when pH 〉=9.0 of major circulatory system inner cold water or conductivity＞3.0 μ S/cm, the little mixed bed terminal valve of closing the bypass circuit system is opened inner cold water case demineralized water water compensating valve and blowdown valve, stops to conductivity＜1.0 μ S/cm.
A kind of alkaline matter that is used for regulate and control method of the present invention, it is made up of negative resin and positive resin, and yin and yang resin can adopt the high-purity resin that high-purity is resin dedicated or special process is regenerated; The proportioning of yin and yang resin is determined according to generator unit parameter and inner cold water system performance.
A kind of supervisory control system that realizes regulate and control method of the present invention, it comprises the inner cold water circulatory system and bypass circuit system; This bypass circuit system comprises a measurement and control unit and some measure and control instruments and controlled little mixed bed; The inner cold water circulatory system comprises circulating pump, inner cold water case and generator; Measurement and control unit passes through valve respectively, the signal cable of measure and control instrument and controlled little mixed bed, and circulating pump, the inner cold water case, generator is communicated with; Measure and control instrument comprises conductivity table, pH pH-value determination pH table, and blowdown flow is taken into account the refill flow meter.
Advantage of the present invention is: make the copper corrosion potential difference reduce owing to inner cold water being adjusted to alkalescence, make the corrosion rate of Cu greatly reduce, more because the oxidation product that generates mainly is the Cu with protective effect
2O, thus parent metal copper is effectively protected.Distinctive feature of the present invention is the ingenious little mixed corrosion that impurity and while slowly-releasing alkaline matter in the auto purification ability reduction water of inner cold water is used as inhibition copper that utilize; The water quality parameter that utilization is easy to detect (pH value, conductivity) is realized detecting automatically and auto-control, does not need manual detection and dosing, and the permanently effective operation of system's energy, does not need frequently to change water, moisturizing.
Description of drawings:
Fig. 1 is a supervisory control system schematic diagram of the present invention.
Embodiment:
Among the figure: 1, generator unit stator winding, 2, the inner cold water case, 3, the inner cold water circulating pump.Measurement and control unit 10 after treatment, sends control signal from the water quality signal of online conductivity table 7, online pH meter 8 collection inner cold waters, opens or close electromagnetically operated valve 4 and 6, controls putting into operation or stopping transport of little mixed bed 5; Or control electromagnetically operated valve 11 and 13 unlatching or close, carry out blowdown and moisturizing operation; Measurement and control unit 10 is gathered flow signal and is carried out the water balance adjusting from blowdown flow meter 12 and refill flow meter 14; Measurement and control unit 10 carries out discontinuous water quality detection control also according to the closure or openness of setting duty control solenoid valve 9.
The alkaline matter of realizing the inventive method derives from the mixed bed of being made up of negative resin and positive resin.Yin and yang resin can adopt the high-purity resin that high-purity is resin dedicated or special process is regenerated; The proportioning of yin and yang resin is determined according to generator unit parameter and inner cold water system performance in the little mixed bed.
Supervisory control system of the present invention, it comprises the inner cold water circulatory system and bypass circuit system; This bypass circuit system comprises a measurement and control unit 10 and some measure and control instruments and controlled little mixed bed 5; The pneumostome of inner cold water case 2 is equipped with the antifouling device of high purity water in the inner cold water circulatory system, or the high pure nitrogen capsule, and the overflow pipe delivery port is equipped with non-return valve or anti-gas backflow containment member; Measurement and control unit 10 passes through valve respectively, the signal cable of measure and control instrument and controlled little mixed bed 5, and circulating pump 3, inner cold water case 2, generator 1 is communicated with; Measure and control instrument comprises by conductivity table 7, pH pH-value determination pH table 8, blowdown flow meter 12 and refill flow meter 14.
Method principle of the present invention is, utilize the little mixed bed 5 in the bypass clean-up system of the inner cold water circulatory system to carry out microcirculation, bring inner cold water case 2 into by the alkaline matter that the inner cold water that flows through little mixed bed 5 goes out the resin bed slowly-releasing, regulate the corrosion of inner cold water water quality and inhibition hollow copper conductor whereby.The regulate and control method that the present invention proposes, it is characterized in that: A, be lower than 7.5 and conductivity when being lower than 3.0 μ S/cm as the pH of the inner cold water circulatory system inner cold water that records, little mixed bed 5 terminal valves 4 and 6 of the road circulatory system are close in unlatching, allow a part of inner cold water carry out microcirculation, bring the alkaline matter that little mixed bed 5 resin bed slowly-releasings go out into inner cold water case 2 through little mixed bed 5; B, when inner cold water circulatory system inner cold water pH rises to 8.5 and conductivity when being no more than 3.0 μ S/cm, close the terminal valve 4 and 6 of the little mixed bed 5 of bypass circuit system; C, when inner cold water pH value meets or exceeds 9.0 or conductivity when surpassing 3.0 μ S/cm, close the terminal valve 4 and 6 of little mixed bed 5, the demineralized water water compensating valve 13 and blowdown valve 11 to the conductivity of opening inner cold water case 2 are reduced to less than 1.0 μ S/cm.
Bypass alkaline matter of the present invention is that anion exchange resin adopts the OH type anion exchange resin that does not contain Cl type resin in being close to the little mixed bed 5 of the road circulatory system; The ionic forms of cation exchange resin can be Na type, K type, NH
4The monovalent cation type of non-H types such as type or Li type.Yin and yang resin is the high-purity resin that high-purity is resin dedicated or special process is regenerated.The proportioning of yin and yang resin determines according to generator 1 inner cold water water quality situation that in advance employing waits the operating capacity proportioning generally speaking, and should mix.In order to reduce the microcirculqtory system start-stop time, prolong inner cold water and do not change water and circulate continuously cooling running time, also can take further step to system, prevent airborne CO
2Enter decline and the HCO that causes the pH value
3 -And CO
3 =Content increases.This measure is exactly, and for closed circulation system, the antifouling device of high purity water is installed before inner cold water case pneumostome, or the high pure nitrogen capsule is installed, and non-return valve is installed or prevented the sealing device of gas backstreaming at the overflow pipe delivery port.
Slowly-releasing regulation and control method of the present invention also has following embodiment: in order to reduce the loss of inner cold water, reduce inner cold water case moisturizing frequency, the non-continuous sampling working method is adopted in the detection of inner cold water pH value and conductivity, according to water quality parameter intelligence sample needs, certain hour is opened the sampling water valve in advance, after control system obtains water quality information, close the sampling water valve immediately.During non-moisturizing or changing water, the sampling interval is 2h～8h, and each water flowing time is no more than 15min.Far away and the stoppage in transit according to the throwing of unit parameter height and the concrete technology controlling and process bypath system of system.The bypass microcirculqtory system is thrown when far away, and the inner cold water conductivity upper limit is set at 2.0 μ S/cm or 3.0 μ S/cm; During the moisturizing of inner cold water case, the lower limit of conductivity can be set at 0.6 μ S/cm or 0.8 μ S/cm.
The present invention adopts microcirculation slowly-releasing regulation and control technology, the impurity that utilizes little mixed bed 5 to remove in the inner cold water, convert copper ion and other non-monovalent metallic ion to monovalent metallic ion or ammonium ion, bicarbonate ion and other anion are converted to hydroxide ion, make inner cold water keep alkalescence.Because the water of copper-aqueous systems is alkalescence, make the oxygen electrode current potential of redox reaction of dissolved oxygen reduce, because:
In acid medium:
e°＝1.229V
In neutral medium:
e°＝0.815V
In alkaline medium:
e°=0.401V and in weak alkaline medium, the Cu redox reaction is:
Claims (7)
1, a kind of inner-cooling water microcirculation slowly-releasing regulation and control method is characterized in that: comprise following monitor procedure:
A, when the pH of major circulatory system inner cold water is lower than 7.5 and conductivity＜3.0 μ S/cm, the little mixed bed terminal valve of opening the bypass circuit system carries out microcirculation, the micro-alkaline matter that allows little mixed bed slowly-releasing go out enters the inner cold water case;
B, when major circulatory system inner cold water pH value rises to 8.5 and conductivity when being no more than 3.0 μ S/cm, close the terminal valve of the little mixed bed of bypass circuit system;
C, when pH 〉=9.0 of major circulatory system inner cold water or conductivity＞3.0 μ S/cm, the little mixed bed terminal valve of closing the bypass circuit system is opened inner cold water case demineralized water water compensating valve and blowdown valve and is stopped to conductivity＜1.0 μ S/cm.
2, regulate and control method according to claim 1 is characterized in that: the non-continuous sampling mode is taked in the detection of inner cold water pH value and conductivity, and the time in sampling interval is 2h～8h.
3, regulate and control method according to claim 1, it is characterized in that: according to unit parameter height and the concrete technology of system, the inner cold water conductivity upper limit is set at 2.0 μ S/cm or 3.0 μ S/cm when opening the bypass circuit system, during moisturizing, the lower limit set of conductivity is 0.6 μ S/cm or 0.8 μ S/cm.
4, a kind of alkaline matter that is used for the described regulate and control method of claim 1 is characterized in that: it is made up of negative resin and positive resin, and yin and yang resin can adopt the high-purity resin that high-purity is resin dedicated or special process is regenerated; The proportioning of yin and yang resin is determined according to generator unit parameter and inner cold water water quality characteristic.
5, alkaline matter according to claim 4 is characterized in that, described cloudy tree type fat is not for containing the OH type resin of Cl type resin, and positive type resin is non-H type monovalent cation type ion exchange resin, can be the Na type, K type, NH
4Type, or Li type cation exchange resin.
6, a kind of supervisory control system that realizes the described regulation and control control method of claim 1 is characterized in that, it comprises the inner cold water circulatory system and bypass circuit system; This bypass circuit system comprises a measurement and control unit (10) and some measure and control instruments and controlled little mixed bed (5); The inner cold water circulatory system comprises circulating pump (3), inner cold water case (2) and generator (1); Measurement and control unit (10) passes through valve respectively, the signal cable of measure and control instrument and controlled little mixed bed (5), and circulating pump (3), inner cold water case (2), generator (1) is communicated with; Measure and control instrument comprises conductivity table (7), pH pH-value determination pH table (8), blowdown flow meter (12) and refill flow meter (14).
7, supervisory control system according to claim 6 is characterized in that, the pneumostome of inner cold water case (2) is equipped with the antifouling device of high purity water in the inner cold water circulatory system, or the high pure nitrogen capsule, and the overflow pipe delivery port is equipped with non-return valve or anti-gas backflow containment member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01138300 CN1126231C (en) | 2001-12-17 | 2001-12-17 | Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01138300 CN1126231C (en) | 2001-12-17 | 2001-12-17 | Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system |
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|---|---|
| CN1354546A CN1354546A (en) | 2002-06-19 |
| CN1126231C true CN1126231C (en) | 2003-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01138300 Expired - Fee Related CN1126231C (en) | 2001-12-17 | 2001-12-17 | Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101335477B (en) * | 2007-06-27 | 2011-03-30 | 天津国华盘山发电有限责任公司 | Internal cold water supplying system for electricity generator cold water system |
| CN102557314A (en) * | 2012-03-09 | 2012-07-11 | 江苏新澳电力技术有限公司 | Pure water preparation device |
| CN104843827B (en) * | 2014-02-19 | 2017-01-11 | 华电章丘发电有限公司 | Small mixed bed resin online ammoniation and in vivo regeneration technology for generator internal cold water treatment |
| CN106006910B (en) * | 2016-07-19 | 2019-01-04 | 西安热工研究院有限公司 | A method of for copper conductor corrosion to be monitored and controlled in generator stator cooling water |
| CN110927052A (en) * | 2019-11-28 | 2020-03-27 | 武汉大学 | Dynamic coupon test method for red copper |
| CN111762956B (en) * | 2020-07-31 | 2023-07-18 | 西安热工研究院有限公司 | SCAL type inter-cooling system circulating water quality regulation and control device and application method thereof |
| 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 |
| 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 |
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