CN105759712A - Precise control device and method for condensation water automatic ammonia injection - Google Patents
Precise control device and method for condensation water automatic ammonia injection Download PDFInfo
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- CN105759712A CN105759712A CN201610207917.8A CN201610207917A CN105759712A CN 105759712 A CN105759712 A CN 105759712A CN 201610207917 A CN201610207917 A CN 201610207917A CN 105759712 A CN105759712 A CN 105759712A
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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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- 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
The invention discloses a precise control device and a method for condensation water automatic ammonia injection. The device comprises a conductivity detector, a flow detector, a PLC control system and a variable frequency ammonia injection pump, wherein the conductivity detector feeds back the conductivity value of an ammonia solution in a medicine box to the PLC control system to work out the concentration value of the ammonia solution in the medicine box; the conductivity set value for an entrance of a unit deaerator is fed back to the PLC control system to work out the automatic concentration in the condensation water; the unit condensation water flow is fed back to the PLC control system to calculate the theoretical medicine adding flow for the needed ammonia; the flow detector detects the medicine adding flow at the exit of the variable frequency ammonia injection pump, and the data are fed back to the PLC control system; the PLC control system adjusts the actual medicine adding flow of the ammonia to achieve the theoretical medicine adding flow through adjusting the frequency of the variable frequency ammonia injection pump; and the actual conductivity detection value at the entrance of the deaerator is fed back to the PLC control system, and composite PID adjustment is carried out on the actual medicine adding flow of the ammonia. Thus, automatic and precise adjustment on the condensation water condensation water is realized.
Description
Technical field
The present invention relates to Power Plant Water Vapor cycle chemistry loading techniques field, particularly to a kind of precise control device condensing water Automatic Ammonia adding and method.
Background technology
For ensureing the safety of power plant, economical operation, water-steam system requires over ammonification and regulates the pH purpose reaching to prevent heat power equipment from corroding.The water-steam system ammonification mode of unit design is generally condensation water and 2 ammonifications of feedwater, and namely precision processing outlet mother pipe and oxygen-eliminating device outlet are a little each.Practice result shows, in oxygen-eliminating device exhaust process, the loss amount of ammonia is little, precision processing outlet mother is adopted to manage oxygen-eliminating device entrance and economizer entrance during some ammonifications basically identical to electrical conductivity of water and pH value, it is more beneficial for the anticorrosion of the equipment such as low pressure feed water pipeline, oxygen-eliminating device, also can save feedwater and add the operation and maintenance cost of ammonia pump.Therefore, under unit normal operation, it is proposed that adopt and condense some ammonification modes of water.
At present, although the Ammonia adding System design of most of power plant has Automatic Ammonia adding program, but there is the problem that when unit load changes, dosing flow cannot promptly and accurately regulate, actual control accuracy is poor, and the rate that automatically comes into operation is relatively low.Therefore, most of power plant still adopt and manually adjust the frequency adding ammonia pump on host computer picture, thus adjusting ammonia chemical feeding quantity to reach the pH scope that water-steam system needs.When considering pure water, pH value measures the impact by factors such as electrostatic charge, Grounding, liquid junction potential, correction situation, glass electrode situations, and pH table measurement value is easier to deviation occur.And conductivity measurement is based on current signal, the impact being not substantially affected by pure water electrostatic charge, the interference of other extraneous factors is also only small, feedwater, condenses the pure electrical conductivity of waters such as water and easily measures accurately.When pure water (hydrogen conductivity is less than 0.3 μ S/cm), there is following relation in pH value, ammonia content and electrical conductivity: pH=8.57+logSC (when SC:25 DEG C direct conductivity, μ S/cm).Therefore, water-steam system ammonia residual can be controlled by the conductivity value of oxygen-eliminating device entrance, thus indirectly controlling water-steam system pH value.
Owing to most Power Plant are peaking operation, load often changes, therefore in water-steam system, the adjustment of ammonia chemical feeding quantity cannot meet the requirement that load frequently changes, and not only have impact on the safety of unit operation, also substantially increases the work difficulty of operations staff.In consideration of it, need a kind of precise control device and method that can realize condensing water Automatic Ammonia adding.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides the precise control device and method that condense water Automatic Ammonia adding.
For reaching object above, the present invention adopts the following technical scheme that
A kind of condensation water Automatic Ammonia adding precise control device, including the electric conductivity detector 1 being arranged in ammonia solution case and measuring ammonia solution electrical conductivity in it, it is arranged on ammonia solution case and adds ammonia pump 4 to the flow detector 2 on the pipeline of the female pipe dosing of precision processing outlet and frequency conversion, add, with electric conductivity detector 1, flow detector 2 and frequency conversion, the PLC control system 3 that ammonia pump 4 is connected；The signal of electric conductivity detector 1 and flow detector 2 transmits to PLC control system 3, and PLC control system 3 automatically adjusts frequency conversion and adds the frequency of ammonia pump 4, thus adjusting the actual dosing flow Q of ammoniaS；Meanwhile, by actually detected for oxygen-eliminating device entrance electrical conductivity value KJFeed back to PLC control system 3, the actual dosing flow Q to ammoniaSCarry out combined type PID adjustment, thus realizing condensing automatically accurately regulating of water ammonia residual.
Described above condense water Automatic Ammonia adding precise control device control method, electric conductivity detector 1 measures the conductivity value K of ammonia solution in ammonia solution caseA, and by the conductivity value K of ammonia solutionAFeed back to PLC control system 3 and converse ammonia concn CA, computing 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 SystemCFeeding back to PLC control system 3, PLC control system 3 converses and condenses ammonia density C required in waterN, computing formula is 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 the theoretical dosing flow Q of required ammoniaL, computing formula is: QL=(QN×CN)/CA；Flow detector 2 detects the dosing flow of frequency conversion ammonification pump discharge the actual dosing flow Q of the ammonia by mensurationSFeed back to PLC control system 3；PLC control system 3 is automatically adjusted frequency conversion and adds the frequency of ammonia pump 4, thus adjusting the actual dosing flow Q of ammoniaSReach theoretical dosing flow QL；Meanwhile, by actually detected for oxygen-eliminating device entrance electrical conductivity in unit Distributed Control System value KJFeed back to PLC control system 3, the PLC control system 3 actual dosing flow Q to ammoniaSCarry out combined type PID adjustment, thus realizing condensing automatically accurately regulating of water ammonia residual.
Compared to the prior art relatively, the present invention possesses following advantage:
Apparatus of the present invention and method simple practical and control accuracy are high, it is possible to adjust unit ammonia residual quickly and accurately, to the water-steam system pH requirement controlled when meeting unit different load.Compare current ammonification control method, add the Theoretical Calculation of ammonia dosing flow, and dosing flow has been carried out real-time monitoring, carry out combined type PID adjustment with reference to the oxygen-eliminating device actually detected value of entrance electrical conductivity, thus can realize condensing automatically accurately regulating of water ammonia residual.Adopt this invention to not only solve the control problem of water-steam system ammonia residual, and decrease the workload of operations staff, improve safety and economy that generating set runs.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
As shown in drawings, electric conductivity detector 1 is installed in ammonia solution case and measures the conductivity value K of ammonia solution in ammonia solution caseA, by the conductivity value K of ammonia solutionAFeed back to PLC control system 3 and converse ammonia concn CA, computing 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 control system 3 and converse the ammonia density C required for condensing in waterN, computing formula is 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 the theoretical dosing flow Q of required ammoniaL, computing formula is: QL=(QN×CN)/CA；Flow detector 2 detects the dosing flow of frequency conversion ammonification pump discharge the actual dosing flow Q of the ammonia by mensurationSFeed back to PLC control system 3；PLC control system 3 is automatically adjusted frequency conversion and adds the frequency of ammonia pump 4, thus adjusting the actual dosing flow Q of ammoniaSReach calculated value QL；Meanwhile, by actually detected for oxygen-eliminating device entrance electrical conductivity in unit Distributed Control System value KJFeed back to PLC control system 3, the actual dosing flow Q to ammoniaSCarry out combined type PID adjustment, thus realizing condensing automatically accurately regulating of water ammonia residual.
Claims (2)
1. one kind condenses water Automatic Ammonia adding precise control device, it is characterized in that: include being arranged in ammonia solution case and measuring the electric conductivity detector (1) of ammonia solution electrical conductivity in it, it is arranged on ammonia solution case and adds ammonia pump (4) to the flow detector (2) on the pipeline of the female pipe dosing of precision processing outlet and frequency conversion, add, with electric conductivity detector (1), flow detector (2) and frequency conversion, the PLC control system (3) that ammonia pump (4) is connected；The signal of electric conductivity detector (1) and flow detector (2) transmits to PLC control system (3), PLC control system (3) automatically adjusts frequency conversion and adds the frequency of ammonia pump (4), thus adjusting the actual dosing flow QS of ammonia；Meanwhile, by actually detected for oxygen-eliminating device entrance electrical conductivity in unit Distributed Control System value KJFeed back to PLC control system (3), the actual dosing flow Q to ammoniaSCarry out combined type PID adjustment, thus realizing condensing automatically accurately regulating of water ammonia residual.
2. the control method condensing water Automatic Ammonia adding precise control device described in claim 1, it is characterised in that: electric conductivity detector (1) measures the conductivity value K of ammonia solution in ammonia solution caseA, and by the conductivity value K of ammonia solutionAFeed back to PLC control system (3) and converse ammonia concn CA, computing 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 SystemCFeeding back to PLC control system (3), PLC control system (3) converses and condenses ammonia density C required in waterN, computing formula is 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 the theoretical dosing flow Q of required ammoniaL, computing formula is: QL=(QN×CN)/CA；The dosing flow of flow detector (2) detection frequency conversion ammonification pump discharge, and the actual dosing flow Q of the ammonia by mensurationSFeed back to PLC control system (3)；PLC control system (3) is automatically adjusted frequency conversion and adds the frequency of ammonia pump (4), thus adjusting the actual dosing flow Q of ammoniaSReach theoretical dosing flow QL；Meanwhile, by actually detected for oxygen-eliminating device entrance electrical conductivity in unit Distributed Control System value KJFeeding back to PLC control system (3), the actual dosing flow QS of ammonia is carried out combined type PID adjustment by PLC control system (3), thus realizing condensing automatically accurately regulating of water ammonia residual.
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| CN106292455A (en) * | 2016-09-28 | 2017-01-04 | 西安热工研究院有限公司 | A kind of direct current cooker condenses water ammonification and personalizes inspection type intelligence control system and control method |
| 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 |
| CN110004491A (en) * | 2017-12-19 | 2019-07-12 | 胜高股份有限公司 | The manufacturing method of silicon single crystal |
| CN110182924A (en) * | 2019-06-04 | 2019-08-30 | 西安热工研究院有限公司 | Automatically method is ammoniated with ammonia with ammonia ammonification integrative machine and automatically |
| CN110217900A (en) * | 2019-04-18 | 2019-09-10 | 西安热工研究院有限公司 | A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification |
| CN110794883A (en) * | 2019-11-28 | 2020-02-14 | 湖北华电江陵发电有限公司 | Control method and system for automatically adding ammonia into condensed water of power plant |
| CN110850908A (en) * | 2019-11-08 | 2020-02-28 | 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 |
| 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 |
| CN112462700A (en) * | 2020-11-09 | 2021-03-09 | 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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| 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 |
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| CN110217900A (en) * | 2019-04-18 | 2019-09-10 | 西安热工研究院有限公司 | A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification |
| 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 |
| CN110182924A (en) * | 2019-06-04 | 2019-08-30 | 西安热工研究院有限公司 | Automatically method is ammoniated with ammonia with ammonia ammonification integrative machine and automatically |
| 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 |
| CN110850908A (en) * | 2019-11-08 | 2020-02-28 | 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 |
| CN110794883A (en) * | 2019-11-28 | 2020-02-14 | 湖北华电江陵发电有限公司 | Control method and system for automatically adding ammonia into condensed 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 |
| CN112462700A (en) * | 2020-11-09 | 2021-03-09 | 西安热工研究院有限公司 | Intelligent chemical water working condition control system and method for power plant |
| 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. |