CN102426466A - Power generator internal cold water quality monitoring control system based on multi-point control - Google Patents
Power generator internal cold water quality monitoring control system based on multi-point control Download PDFInfo
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- CN102426466A CN102426466A CN201110307542XA CN201110307542A CN102426466A CN 102426466 A CN102426466 A CN 102426466A CN 201110307542X A CN201110307542X A CN 201110307542XA CN 201110307542 A CN201110307542 A CN 201110307542A CN 102426466 A CN102426466 A CN 102426466A
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Abstract
The invention relates to an internal cold water quality monitoring control system applicable to a power generator with a stator bar made from red copper. The traditional domestic and overseas internal cold water quality adjusting devices all have problems of large water quality fluctuation and poor safety due to the use of alkali adding systems using a single-point control method. According to the invention, two paths of sampling points are arranged on a water inlet mother pipe and a water return mother pipe of a stator cooling water tank; an online pH meter and an online conductivity meter are mounted on each path of sampling points; the pH meter, the conductivity meter and a stator cooling water pump in the internal cold water system are connected with a PLC (Programmable Logic Controller) controller by signal wires; the PLC controller is embedded with a PID (Proportion Integration Differentiation) control algorithm program applicable to the internal cold water system and based on expert control rules; and the PID control algorithm program is used for processing the collected real-time data according to set rules and controlling the starting and stopping of an alkali adding metering pump according to an operation result. By using the multi-point control method provided by the invention, more complete interlocked protective function is realized, the excessive adding of the alkali liquor is completely eliminated and the safety of the internal cold water system is assured.
Description
Technical field
The present invention relates to water quality monitoring control field, specifically a kind of stator bar that is applicable to is the electric generator inner cooling water water quality monitoring control system of red copper.
Background technology
Generation current machine inner cold water system water quality method of adjustment commonly used mainly contains four kinds: common little mixed bed method, basic resin adjustment method, alkali adding method and condensate ratio moisturizing method; The alkali adding method of using comparatively generally has a large amount of adder-subtractors to use in the generator system at present at home and abroad.Yet; The principle of inner cold water water quality adjusting gear all is to go out the single-point control that electrical conductivity of water is a core with control stator cooling water tank both at home and abroad at present; Promptly on stator cooling water tank main water outlet pipe, one road sample tap is set; Conductivity through this place of real-time measurement is controlled the start and stop that add alkali pump, thereby reaches the stable purpose of controlling inner cold water system water pH value; PH value and conductivity that this method is based on pure water exist certain corresponding relation, control is difficult for surveying accurate pH value is transformed into the easy conductivity of measuring, and control idea is comparatively simple.But that adopts single-point control method adds the alkali system, and variation water quality property is big, poor stability; Its main cause is that single-point control method can't be discerned the running status of inner cold water system, and the accuracy of sampling is depended in the performance of its effect to a great extent; In case cause can not getting the water sample of water sample or taking-up because of other reasonses such as generator outages not representative; Then be prone to cause control system to be judged by accident, thereby cause the inner cold water system to add base excess, jeopardize the safety of copper cash rod and epoxy surrounding layer.This type of accident is domestic have been taken place a lot ofly, has had a strong impact on the safety of generator system.
Summary of the invention
In order to overcome the water quality control shakiness that has adder-subtractor single-point control method now and cause, the shortcoming of poor stability; It is a kind of with multiple spot control, based on the electric generator inner cooling water water quality monitoring control system of Expert PID Controller that the present invention provides; With stable control inner cold water water quality in setting value; Thoroughly stop to add the situation generation of base excess, the security that improves the inner cold water system greatly.
The technical scheme that the present invention adopts is following: based on the electric generator inner cooling water water quality monitoring control system of multiple spot control; It is characterized in that; On female pipe of stator cooling water tank water inlet and the female pipe of backwater, 2 road sampling spots are set respectively; Every road sampling spot is all installed 1 online pH meter and 1 online conductivity meter; Stator cooling-water pump in pH meter, conductivity meter and the inner cold water system is connected the built-in pid control algorithm program based on Expert Control Rules that is applicable to the inner cold water system of PLC controller through signal wire with the PLC controller;
The PLC controller drives adds the inside chilled water system of alkali volume pump and adds alkali; The PLC controller is gathered the current signal of pH value, conductivity and the stator cooling-water pump running status of water inlet of inner cold water system and water outlet in real time; Described pid control algorithm program is handled the real time data that collects according to the rule of setting, and controls the start and stop that add the alkali volume pump according to operation result;
When the pH of inner cold water system value between 8.5 ± 0.3, conductivity is between 1.5 ± 0.5 μ S/cm the time, closes to add the alkali volume pump; When the water quality parameter of inner cold water system is lower than above-mentioned controlling value, starts and to add the inside chilled water system of alkali volume pump and add alkali to water quality and reach the control requirement.
Pid control algorithm is a kind of control method of widespread use; Have simple in structure, advantage such as parameter tuning is convenient, but when controlled device (like the pH that decides cold water, conductivity etc.) be non-linear; The time during characteristic such as change, hysteresis; Simple pid algorithm may cause controlled system ceaselessly to be vibrated, and can not satisfy the control requirement, and expert system just can be made better prediction to the problems referred to above; And find out the suitable scheme of dealing with problems, and expert system can be handled some error or incomplete data are arranged.Both advantages are combined just to have produced the pid control algorithm based on Expert Control Rules, claim Expert PID Controller again, be called for short expert PID.
The present invention has improved control accuracy and security according to setting Expert Control Rules into and out of the difference of electrical conductivity of water, the difference of Inlet and outlet water pH and the difference of unit interval inner stator cooling-water pump electric current.
PLC controller of the present invention is according to pH value, the conductivity of the turnover jellyfish pipe that collects in real time and decide 6 road signals such as water supply pump electric current; Expert Control Rules according to the pid control algorithm program setting is carried out computing; Start and stop and stroke according to operation result adjustment volume pump; Reach the purpose of the stable control inner cold water pH of system value and conductivity, in the passivation region that is controlled at copper with water stabilization, thereby suppress the excellent corrosion of copper cash.In whole control process, can identify the running status and the change of water quality trend of inner cold water system exactly based on the pid control algorithm program of Expert Control Rules, thoroughly stopped the phenomenon that the inner cold water system adds base excess and taken place.
The present invention introduces the operating state signal of stator cooling-water pump, is used to be provided with corresponding interlocking, prevents the alkali lye mistake and adds phenomenon, guarantees the safety of inner cold water system.
Use the present invention; Do not use little mixed bed; Not blowdown, inner cold water pH value stabilization are 8.5 ± 0.3, and stable conductivity is between 1.5 ± 0.5 μ S/cm; Content of copper ion meets the regulation of newest standards DL/T 801-2010 " high-rating generator inner cold water water quality and systems technology require " fully less than 10 μ g/L.
Compare the single-point control method that simple control stator cooling water tank goes out water conductivity both at home and abroad; In the scope that the present invention is controlled at setting with the pH value and the conductivity of inner cold water accurately and stably; And multiple spot control method has realized more perfect interlock protection function; Thoroughly stop alkali lye and cross and add phenomenon, guaranteed the safety of inner cold water system greatly.
Below in conjunction with Figure of description and embodiment the present invention is described further.
Description of drawings
Fig. 1 is the structural representation of electric generator inner cooling water water quality monitoring control system of the present invention.
Fig. 2 is the process flow diagram of pid control algorithm program of the present invention.
Among Fig. 1: 1. stator cooling water tank, 2. stator cooling-water pump A, 3. stator cooling-water pump A current signal, 4. stator cooling-water pump B; 5. stator cooling-water pump B current signal, 6. system carries little mixed bed, 7. inner cold water system water inlet (water outlet of stator cooling water tank) conductivity meter, 8. inner cold water system water inlet (water outlet of stator cooling water tank) pH meter; 9. main filter screen, 10. generator unit stator system, 11. inner cold water systems water outlet (stator cooling water tank backwater) conductivity meter; 12. inner cold water system water outlet (stator cooling water tank backwater) pH meter, the 13.PLC controller, 14. add the alkali volume pump; 15. the aqueous slkali case, 16. water inlet collection pipes, 17. water outlet collection pipes.
Among Fig. 1, the direction indication of solid arrow decide chilled water system flow direction, alkaline stream to; The dotted line of band arrow is a signal wire, has 6 road signal wires.
Among Fig. 2, DD
IN, DD
OUT, pH
IN, pH
OUT, I
n, I
N-1, I
Set, Δ δ
1, Δ δ
2With Δ δ
3Be respectively water conductivity into, go out water conductivity, the difference limit value of the pH value of the difference limit value of the conductivity of the stator cooling-water pump current limit of the electric current of the electric current of water inlet pH value, water outlet pH value, this stator cooling-water pump that monitors, the stator cooling-water pump that last time monitored, setting, setting, setting and the electric current difference limit value of setting.
Embodiment
Electric generator inner cooling water water quality monitoring control system as shown in Figure 1; Respectively be provided with 2 road sampling spots on female pipe of stator cooling water tank water inlet and the female pipe of backwater; Every road sampling spot is all installed 1 online pH meter and 1 online conductivity meter; PH meter 8,12; Conductivity meter 7,11 and stator cooling-water pump A, stator cooling-water pump B are connected with PLC controller 13 through signal wire, the built-in pid control algorithm program that is applicable to the inner cold water system of PLC controller based on Expert Control Rules, and its control flow chart is as shown in Figure 2.
Stator cooling-water pump A (or B) 2 (or 4) flow into pure water in the stator cooling water tank 1 in the water inlet collection pipe 16 of generator unit stator system 10 through main filter screen 9, through being back in the stator cooling water tank 1 behind the water outlet collection pipe 17.
Add alkali volume pump 14 inlet and link to each other with aqueous slkali case 15, outlet carries little mixed 6 shunt valves with system and links to each other, and adds the concentration of lye in the stroke may command water body of alkali volume pump 14 through adjustment.
The PLC controller drives adds the inside chilled water system of alkali volume pump and adds alkali; PLC controller 13 comprehensive 6 road input signals carry out computing; 6 road input signals comprise the signal of the signal of 2 conductivity meters 7 and 11,2 pH meters 8 and 12 and the signal of two stator cooling-water pump A2 and stator cooling-water pump B4, and adjustment adds the start and stop and the stroke of alkali volume pump 14 according to operation result.
Claims (2)
1. the electric generator inner cooling water water quality monitoring control system of controlling based on multiple spot; It is characterized in that; On female pipe of stator cooling water tank water inlet and the female pipe of backwater, 2 road sampling spots are set respectively; Every road sampling spot is all installed 1 online pH meter and 1 online conductivity meter, and the stator cooling-water pump in pH meter, conductivity meter and the inner cold water system is connected the built-in pid control algorithm program based on Expert Control Rules that is applicable to the inner cold water system of PLC controller through signal wire with the PLC controller;
The PLC controller drives adds the inside chilled water system of alkali volume pump and adds alkali; The PLC controller is gathered the current signal of pH value, conductivity and the stator cooling-water pump running status of water inlet of inner cold water system and water outlet in real time; Described pid control algorithm program is handled the real time data that collects according to the rule of setting, and controls the start and stop that add the alkali volume pump according to operation result;
When the pH of inner cold water system value between 8.5 ± 0.3, conductivity is between 1.5 ± 0.5 μ S/cm the time, closes to add the alkali volume pump; When the water quality parameter of inner cold water system is lower than above-mentioned controlling value, starts and to add the inside chilled water system of alkali volume pump and add alkali to water quality and reach the control requirement.
2. the electric generator inner cooling water water quality monitoring control system based on multiple spot control according to claim 1; It is characterized in that, according to setting Expert Control Rules into and out of the difference of electrical conductivity of water, the difference of Inlet and outlet water pH and the difference of unit interval inner stator cooling-water pump electric current.
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| CN 201110307542 CN102426466B (en) | 2011-10-12 | 2011-10-12 | Power generator internal cold water quality monitoring control system based on multi-point control |
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| CN 201110307542 CN102426466B (en) | 2011-10-12 | 2011-10-12 | Power generator internal cold water quality monitoring control system based on multi-point control |
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| CN102426466B CN102426466B (en) | 2013-11-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659234A (en) * | 2012-05-16 | 2012-09-12 | 湖南省电力公司科学研究院 | Method for treating cooling water in generator |
| CN103309327A (en) * | 2013-06-08 | 2013-09-18 | 国家电网公司 | Monitoring device for detecting leak hydrogen in internal cooling water and evaluating influence on quality of internal cooling water |
| CN103455055A (en) * | 2013-08-29 | 2013-12-18 | 施勒智能建筑系统（上海）有限公司 | Method for adjusting pH value through multipoint detection fuzzy PID control in raw water treatment |
| CN106500996A (en) * | 2016-11-24 | 2017-03-15 | 国网山东省电力公司电力科学研究院 | A kind of generator stator bar hot water stream experimental simulation device and experimental technique |
| CN108681296A (en) * | 2018-04-12 | 2018-10-19 | 大唐韩城第二发电有限责任公司 | The control system of inner cold water automatic alkali adding device and the adder-subtractor with the system |
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| US20050150520A1 (en) * | 2003-04-08 | 2005-07-14 | Gill Jasbir S. | Methods of simultaneously cleaning and disinfecting industrial water systems |
| CN201272702Y (en) * | 2008-07-04 | 2009-07-15 | 刘宝山 | Automatic regulating device for inner cold water conductance and acidity of generator |
| CN201648062U (en) * | 2010-02-05 | 2010-11-24 | 河南省日立信股份有限公司 | Generator inner cooling water optimizing adjusting system |
| CN201825772U (en) * | 2010-07-09 | 2011-05-11 | 长沙理工大学 | Inner cooling water pH value intelligent control device of power generator |
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2011
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Patent Citations (4)
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| US20050150520A1 (en) * | 2003-04-08 | 2005-07-14 | Gill Jasbir S. | Methods of simultaneously cleaning and disinfecting industrial water systems |
| CN201272702Y (en) * | 2008-07-04 | 2009-07-15 | 刘宝山 | Automatic regulating device for inner cold water conductance and acidity of generator |
| CN201648062U (en) * | 2010-02-05 | 2010-11-24 | 河南省日立信股份有限公司 | Generator inner cooling water optimizing adjusting system |
| CN201825772U (en) * | 2010-07-09 | 2011-05-11 | 长沙理工大学 | Inner cooling water pH value intelligent control device of power generator |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659234A (en) * | 2012-05-16 | 2012-09-12 | 湖南省电力公司科学研究院 | Method for treating cooling water in generator |
| CN103309327A (en) * | 2013-06-08 | 2013-09-18 | 国家电网公司 | Monitoring device for detecting leak hydrogen in internal cooling water and evaluating influence on quality of internal cooling water |
| CN103455055A (en) * | 2013-08-29 | 2013-12-18 | 施勒智能建筑系统（上海）有限公司 | Method for adjusting pH value through multipoint detection fuzzy PID control in raw water treatment |
| CN106500996A (en) * | 2016-11-24 | 2017-03-15 | 国网山东省电力公司电力科学研究院 | A kind of generator stator bar hot water stream experimental simulation device and experimental technique |
| CN108681296A (en) * | 2018-04-12 | 2018-10-19 | 大唐韩城第二发电有限责任公司 | The control system of inner cold water automatic alkali adding device and the adder-subtractor with the system |
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| CN102426466B (en) | 2013-11-06 |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121101 |
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Address after: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Applicant after: Electric Power Research Institute of Zhejiang electric power company Address before: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Applicant before: ZHEJIANG ELECTRIC POWER TEST AND Research Institute |
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Free format text: CORRECT: APPLICANT; FROM: ZHEJIANG ELECTRIC POWER TEST AND RESEARCH INSITITUTE TO: ZHEJIANG ELECTRIC POWER RESEARCH INSTITUTE OF ZHEJIANG ELECTRIC POWER CORPORATION |
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Effective date of registration: 20121101 Address after: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Applicant after: Electric Power Research Institute of Zhejiang electric power company Applicant after: State Grid Corporation of China Address before: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane Applicant before: Electric Power Research Institute of Zhejiang electric power company |
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