CN105759712B - The precise control device and method of condensation water Automatic Ammonia adding - Google Patents
The precise control device and method of condensation water Automatic Ammonia adding Download PDFInfo
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- CN105759712B CN105759712B CN201610207917.8A CN201610207917A CN105759712B CN 105759712 B CN105759712 B CN 105759712B CN 201610207917 A CN201610207917 A CN 201610207917A CN 105759712 B CN105759712 B CN 105759712B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Non-Electrical Variables (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
A kind of precise control device and method of condensation water Automatic Ammonia adding, the device include electric conductivity detector, flow detector, PLC control system and frequency conversion ammonification pump；The conductivity value of ammonia solution in medicine-chest is fed back to the concentration value that PLC control system converses ammonia solution in medicine-chest by electric conductivity detector；Unit oxygen-eliminating device entrance conductivity setpoint is fed back into PLC control system and converses ammonia density in condensation water；By unit condensing water flow feed back to PLC control system calculate needed for ammonium hydroxide theoretical dosing flow；The dosing flow of flow detector detection frequency conversion ammonification pump discharge, and feed data back to PLC control system；PLC control system reaches theoretical dosing flow by adjusting the actual dosing flow of the frequency adjustment ammonium hydroxide of frequency conversion ammonification pump；Meanwhile the actually detected value of oxygen-eliminating device entrance electrical conductivity is fed back into PLC control system, the actual dosing flow formula PID for composite of ammonium hydroxide is adjusted；By the present invention, realize that the automatic and accurate of condensation water ammonification is adjusted.
Description
Technical field
The present invention relates to Power Plant Water Vapor cycle chemistry loading techniques field, more particularly to a kind of essence of condensation water Automatic Ammonia adding
True control device and method.
Background technology
To ensure the safety of power plant, economical operation, water-steam system needs to prevent heating power from setting to reach by ammoniating adjusting pH
The purpose of standby corrosion.The water-steam system ammonification mode of unit design is usually the 2 points of ammonifications of condensation water and feedwater, i.e. precision processing goes out
Mouth main pipe and oxygen-eliminating device outlet are a little each.Practice result shows that the loss amount of ammonia is seldom in oxygen-eliminating device exhaust process, at essence
Oxygen-eliminating device entrance and the electrical conductivity and pH value of the feedwater of economizer entrance are basically identical when reason outlet main pipe a little ammoniates, and are more advantageous to
The anti-corrosion of the equipment such as low pressure feed water pipeline, oxygen-eliminating device, can also save the operation and maintenance cost of feedwater ammonification pump.Therefore, in machine
Under group normal operation, it is proposed that a little ammoniate mode using condensation water.
At present, although most of power plant's Ammonia adding Systems are designed with Automatic Ammonia adding program, but there is unit load change
When dosing flow the problem of can not promptly and accurately adjusting, actual control accuracy is poor, and the rate that comes into operation automatically is relatively low.Therefore, it is most of
Power plant needs still using the frequency of ammonification pump is manually adjusted on host computer picture so as to adjust ammonium hydroxide dosage and reach water-steam system
The pH scopes wanted.Under the conditions of pure water, pH value measurement is by electrostatic charge, Grounding, liquid junction potential, correction situation, glass
The influence of the factors such as electrode condition, pH meter measured values are easier deviation occur.And conductivity measurement is believed based on electric current
Number, the influence from electrostatic charge in pure water substantially, the electricity of the interference of other extraneous factors also pure water such as very little, feedwater, condensation water
Easily measurement is accurate for conductance.Under the conditions of pure water (hydrogen conductivity is less than 0.3 μ S/cm), pH value, ammonia content and electrical conductivity exist as follows
Relation：PH=8.57+logSC (SC：Direct conductivity at 25 DEG C, μ S/cm).Therefore, the electrical conductivity of oxygen-eliminating device entrance can be passed through
Value controls water-steam system ammonia residual, so that indirect control water-steam system pH value.
Since most Power Plants are peaking operation, load often changes, therefore ammonium hydroxide in water-steam system
The adjustment of dosage can not meet the requirement that load frequently changes, and not only have impact on the security of unit operation, also greatly increase
The work difficulty of operations staff is added.In consideration of it, need a kind of precise control device that can realize condensation water Automatic Ammonia adding and
Method.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides condensation water Automatic Ammonia adding precise control device and
Method.
To achieve the above objectives, the present invention adopts the following technical scheme that：
A kind of condensation water Automatic Ammonia adding precise control device, including be arranged in ammonia solution case and measure its interior ammonia solution electricity
The electric conductivity detector 1 of conductance, is arranged on ammonia solution case to 2 He of flow detector on the pipeline of precision processing outlet main pipe dosing
Frequency conversion ammonification pump 4, the PLC control system 3 being connected with electric conductivity detector 1, flow detector 2 and frequency conversion ammonification pump 4；Electrical conductivity
The signal transmission of detector 1 and flow detector 2 to PLC control system 3,3 adjust automatically frequency conversion of PLC control system ammonification pumps 4
Frequency, so as to adjust the actual dosing flow Q of ammonium hydroxideS；Meanwhile by the actually detected value K of oxygen-eliminating device entrance electrical conductivityJFeed back to
PLC control system 3, to the actual dosing flow Q of ammonium hydroxideSFormula PID for composite is adjusted, so as to fulfill condensation water ammonia residual from
Dynamic accurate adjusting.
The control method of condensation water Automatic Ammonia adding precise control device described above, electric conductivity detector 1 measure ammonia
The conductivity value K of ammonia solution in liquor boxA, and by the conductivity value K of ammonia solutionAFeed back to PLC control system 3 and converse ammonium hydroxide
Concentration CA, calculation formula is：CA=(13.2 × KA 2+62.7×KA)×10-3(mg/L)；By deoxygenation in unit Distributed Control System
Device entrance conductivity setpoint KCPLC control system 3 is fed back to, it is dense that PLC control system 3 converses required ammonia in condensation water
Spend CN, calculation formula CN=(13.2 × KC 2+62.7×KC)×10-3(mg/L)；By condensation water in unit Distributed Control System
Flow QNFeed back to the theoretical dosing flow Q that PLC control system 3 converses required ammonium hydroxideL, calculation formula is：QL=(QN×CN)/
CA；Flow detector 2 detects the dosing flow of frequency conversion ammonification pump discharge, and by the actual dosing flow Q of the ammonium hydroxide of measureSFeedback
To PLC control system 3；PLC control system 3 automatically adjusts the frequency of frequency conversion ammonification pump 4, so as to adjust the actual dosing stream of ammonium hydroxide
Measure QSReach theoretical dosing flow QL；Meanwhile by the actually detected value K of oxygen-eliminating device entrance electrical conductivity in unit Distributed Control SystemJInstead
It is fed to PLC control system 3, actual dosing flow Q of the PLC control system 3 to ammonium hydroxideSFormula PID for composite is adjusted, so as to fulfill
The automatic and accurate of condensation water ammonia residual is adjusted.
Compared to the prior art compared with the present invention possesses following advantage：
Apparatus of the present invention and method simple practical and control accuracy height, can quickly and accurately adjust unit ammonia residual, full
To the requirement of water-steam system pH controls during sufficient unit different load.Compared to current ammonification control method, ammonium hydroxide dosing is added
The theoretical calculation of flow, and real-time monitoring has been carried out to dosing flow, with reference to the actually detected value of oxygen-eliminating device entrance electrical conductivity
Formula PID for composite is adjusted, so as to can realize that the automatic and accurate of condensation water ammonia residual is adjusted.Water is not only solved using the invention
The control problem of vapour system ammonia residual, and reduce the workload of operations staff, improve the security of generating set operation
And economy.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
As shown in drawings, electric conductivity detector 1 is installed in ammonia solution case and measures the conductance of ammonia solution in ammonia solution case
Rate value KA, by the conductivity value K of ammonia solutionAFeed back to PLC control system 3 and converse ammonia concn CA, calculation formula is：CA=
(13.2×KA 2+62.7×KA)×10-3(mg/L)；By oxygen-eliminating device entrance conductivity setpoint K in unit Distributed Control SystemCInstead
It is fed to PLC control system 3 and converses required ammonia density C in condensation waterN, calculation formula CN=(13.2 × KC 2+62.7×
KC)×10-3(mg/L)；By condensing water flow Q in unit Distributed Control SystemNFeed back to PLC control system 3 and converse required ammonia
The theoretical dosing flow Q of waterL, calculation formula is：QL=(QN×CN)/CA；Flow detector 2 detects adding for frequency conversion ammonification pump discharge
Medical abortion amount, and by the actual dosing flow Q of the ammonium hydroxide of measureSFeed back to PLC control system 3；PLC control system 3 automatically adjusts
The frequency of frequency conversion ammonification pump 4, so as to adjust the actual dosing flow Q of ammonium hydroxideSReach calculated value QL；It is meanwhile unit is collecting and distributing
The actually detected value K of oxygen-eliminating device entrance electrical conductivity in control systemJPLC control system 3 is fed back to, to the actual dosing flow of ammonium hydroxide
QSFormula PID for composite is adjusted, and is adjusted so as to fulfill the automatic and accurate of condensation water ammonia residual.
Claims (1)
- A kind of 1. condensation water Automatic Ammonia adding precise control device, it is characterised in that：The device includes being arranged in ammonia solution case simultaneously The electric conductivity detector (1) of its interior ammonia solution electrical conductivity is measured, is arranged on ammonia solution case to the pipe of precision processing outlet main pipe dosing Flow detector (2) and frequency conversion ammonification pump (4) on road, ammoniate with electric conductivity detector (1), flow detector (2) and frequency conversion Pump the PLC control system (3) of (4) connection；The signal transmission of electric conductivity detector (1) and flow detector (2) is controlled to PLC Unite (3), the frequency of PLC control system (3) adjust automatically frequency conversion ammonification pump (4), so as to adjust the actual dosing flow Q of ammonium hydroxideS； Meanwhile by the actually detected value K of oxygen-eliminating device entrance electrical conductivity in unit Distributed Control SystemJPLC control system (3) is fed back to, it is right The actual dosing flow Q of ammonium hydroxideSFormula PID for composite is adjusted, and is adjusted so as to fulfill the automatic and accurate of condensation water ammonia residual；The control method of the device is the conductivity value K of ammonia solution in electric conductivity detector (1) measure ammonia solution caseA, and by ammonia The conductivity value K of solutionAFeed back to PLC control system (3) and converse ammonia concn CA, calculation formula is：CA=(13.2 × KA 2+ 62.7×KA)×10-3(mg/L)；By oxygen-eliminating device entrance conductivity setpoint K in unit Distributed Control SystemCFeed back to PLC controls System (3) processed, PLC control system (3) converse required ammonia density C in condensation waterN, calculation formula CN=(13.2 × KC 2+62.7×KC)×10-3(mg/L)；By condensing water flow Q in unit Distributed Control SystemNFeed back to PLC control system (3) The theoretical dosing flow Q of ammonium hydroxide needed for conversingL, calculation formula is：QL=(QN×CN)/CA；Flow detector (2) detects frequency conversion The dosing flow of pump discharge is ammoniated, and by the actual dosing flow Q of the ammonium hydroxide of measureSFeed back to PLC control system (3)；PLC is controlled The frequency of system (3) automatic adjustment frequency conversion ammonification pump (4) processed, so as to adjust the actual dosing flow Q of ammonium hydroxideSReach theoretical dosing Flow QL；Meanwhile by the actually detected value K of oxygen-eliminating device entrance electrical conductivity in unit Distributed Control SystemJFeed back to PLC control system (3), actual dosing flow Q of the PLC control system (3) to ammonium hydroxideSFormula PID for composite is adjusted, and is ammoniated so as to fulfill condensation water The automatic and accurate of amount is adjusted.
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| CN201610207917.8A CN105759712B (en) | 2016-04-05 | 2016-04-05 | The precise control device and method of condensation water Automatic Ammonia adding |
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| CN201610207917.8A CN105759712B (en) | 2016-04-05 | 2016-04-05 | The precise control device and method of condensation water Automatic Ammonia adding |
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| CN105759712A CN105759712A (en) | 2016-07-13 |
| CN105759712B true CN105759712B (en) | 2018-04-24 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292455B (en) * | 2016-09-28 | 2019-05-21 | 西安热工研究院有限公司 | A kind of ammonification of direct current cooker condensed water personalizes inspection type intelligence control system and control method |
| JP6954088B2 (en) * | 2017-12-19 | 2021-10-27 | 株式会社Sumco | Method for manufacturing silicon single crystal |
| CN108319129A (en) * | 2018-01-24 | 2018-07-24 | 江苏国信靖江发电有限公司 | Ammonification method, apparatus, equipment and the storage medium of condensate system |
| CN110217900B (en) * | 2019-04-18 | 2023-10-13 | 西安热工研究院有限公司 | Cooperative precise control device and method for automatic oxygenation and ammonia addition of power plant water supply |
| CN110182924B (en) * | 2019-06-04 | 2024-03-15 | 西安热工研究院有限公司 | Full-automatic ammonia preparing and adding integrated machine device and full-automatic ammonia preparing and adding method |
| CN110850908B (en) * | 2019-11-08 | 2021-01-29 | 润电能源科学技术有限公司 | Method and device for adjusting pH value of boiler feed water and computer readable storage medium |
| CN110794883B (en) * | 2019-11-28 | 2023-05-23 | 湖北华电江陵发电有限公司 | Control method and system for automatic ammonia addition of condensation water of power plant |
| CN111792716A (en) * | 2020-07-14 | 2020-10-20 | 三门核电有限公司 | Automatic dosing method for two loops in operation period of nuclear power plant |
| CN112361322A (en) * | 2020-10-27 | 2021-02-12 | 西安热工研究院有限公司 | Boiler feed water automatic ammonia adding device and gray prediction feedforward PID control method |
| CN112462700B (en) * | 2020-11-09 | 2021-09-14 | 西安热工研究院有限公司 | Intelligent chemical water working condition control system and method for power plant |
| CN114956219A (en) * | 2022-05-24 | 2022-08-30 | 华能兰州热电有限责任公司 | Automatic control method and system for chemical ammonia addition of thermal power plant |
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Effective date of registration: 20181012 Address after: 710032 Xingqing Road, Xi'an, Shaanxi 136 Patentee after: Xi'an Thermal Power Research Institute Co., Ltd. Address before: 710075 B Torch Hotel, Gaoxin Road, Xi'an, Shaanxi. Patentee before: XI'AN XIRE POWER STATION CHEMICAL SCIENCE & TECHNOLOGY CO., LTD. |
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