CN109240358A - A kind of recirculated water concentration rate automatic control system and method - Google Patents
A kind of recirculated water concentration rate automatic control system and method Download PDFInfo
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- CN109240358A CN109240358A CN201811071449.1A CN201811071449A CN109240358A CN 109240358 A CN109240358 A CN 109240358A CN 201811071449 A CN201811071449 A CN 201811071449A CN 109240358 A CN109240358 A CN 109240358A
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- line monitoring
- monitoring instrument
- concentration rate
- water quality
- instrument table
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
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- Automation & Control Theory (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
A kind of recirculated water concentration rate automatic control system and method, the system includes PLC controller, water quality on-line monitoring instrument table and electric control valve, water quality on-line monitoring instrument table is separately mounted on circulating water system pipeline and sewerage pipeline, and Circulating water effluent waterpipe is equipped with the electric control valve with PLC controller；Its control method, which can be realized, automatically controls generating plant circulation-water concentration rate: measured value is transferred to PLC controller by water quality on-line monitoring instrument table, PLC controller calculates recirculated water concentration rate according to water quality on-line monitoring instrument table measured value, adjust motorized adjustment valve opening, make the control of recirculated water concentration rate in claimed range, realizes that recirculated water concentration rate automatically controls.
Description
Technical field
The present invention relates to power plant Open recirling cooling water systems, and in particular to a kind of recirculated water concentration rate is controlled automatically
System and method processed.
Background technique
Open recirling cooling water system refers to through the cooling water of over-heat-exchanger heat exchange heating in cooling tower and atmosphere
After directly contacting, is directly contacted by cooling tower with atmosphere and be evaporated cooling, then a kind of recycled processing system.
The system is a kind of cooling system most widely used at present, and cooling water is run under highly enriched state, new by uninterruptedly supplementing
Water realizes the height recycling of cooling water with equilibrium vaporization, the water of windage loss and blowdown process losses.
Recirculated water concentration rate refers to recirculating cooling water system in the process of running, due to a certain substance of evaporation and concentration
The ratio of same content of material in content and supplement water, it is an important finger of reflection and the operation of control loop water system
Mark.Concentration rate is low, and big and water treatment agent the efficiency of water consumption, blowdown flow rate is not in full use, and is unfavorable for power plant's warp
Ji operation；Concentration rate height can reduce water, save water process expense, but concentration rate is excessively high, the fouling of recirculated water and
Corrosion tendency will increase, and be unfavorable for being safely operated.Therefore circulation safe and economical operation, the concentration of recirculated water to be taken into account
Multiplying power should be controlled according to power plant's actual conditions in reasonable range.
The pipe that generation current factory generally takes manual analysis, manually controls for the monitoring and control of recirculated water concentration rate
Reason mode.Testing crew does not daily sample recirculated cooling water and keeping the skin wet, lab analysis obtain recirculated cooling water and
Chlorine ion concentration in water is supplemented, the calculating of recirculated water concentration rate is then carried out.
Testing crew will be surveyed recirculated water concentration rate and be compared with control range, manually adjust blowdown flow rate size: such as
Fruit concentration rate is higher than control range, needs to increase cooling water blowdown flow rate, is less than control range, then reduces cooling water blowdown flow rate.
But can not accomplish that recirculated water concentration rate continuously monitors by way of controlling concentration rate manually adjusting blowdown flow rate,
There is the phenomenon that supervising upper blind area, recirculated water concentration rate is caused to runaway controlling and adjusting, and then recycles
Water system equipment scaling and corrosion seriously threaten power plant safe operation.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of recirculated water concentration rates
Automatic control system and method, it is possible to prevente effectively from causing because manually controlling bring recirculated cooling water and runawaying
Safety and economic problems.
In order to reach the goals above, the present invention adopts the following technical scheme:
A kind of recirculated water concentration rate automatic control system, the first water quality including being arranged on condensate make-up piping 1 are online
Measuring instrument 2, the second water quality on-line monitoring instrument table 4 being successively set on sewerage pipeline 3 and with the electronic of PCL controller 6
Regulating valve 5；The first water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4 connect PCL controller 6, the first water
The measurement data of matter on-line monitoring instrument 2 and the second water quality on-line monitoring instrument table 4 is exported to PLC controller 6.
The first water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4 is same type measuring instrumentss, can
Be conductivity meter, chloride ion content analyzer, hardness analysis instrument, alkalinity analyzing instrument, transmissometer, sodium ions content analyzer,
Dioxide-containing silica analyzer or other water quality analyzing instruments.
The control method of the recirculated water concentration rate automatic control system, the first water quality on-line monitoring instrument table 2 and
The data of acquisition are transferred to PLC controller 6 by two water quality on-line monitoring instrument tables 4, and PLC controller 6 calculates recirculated water concentration times
After rate, the aperture of electric control valve 5 is adjusted according to the control range of recirculated water concentration rate: when recirculated water concentration rate is higher than control
When range processed, increase the aperture of electric control valve 5, increases cooling water blowdown flow rate；When recirculated water concentration rate is less than control range
When, reduce the aperture of electric control valve 5, reduce cooling water blowdown flow rate, finally makes the control of recirculated water concentration rate in claimed range
It is interior.
The recirculated water concentration rate calculation formula is as follows:
K=A1/A0
In formula: A1--- 2 measured value of the first water quality on-line monitoring instrument table；A0--- the measurement of the second water quality on-line monitoring instrument 4
Value.
Compared to the prior art compared with the present invention has following advantage: firstly, the use of water quality on-line monitoring instrument table avoids
Testing crew manual analysis bring random error and the discontinuous phenomenon of data；Secondly, water quality on-line monitoring instrument table is in addition to being
Other than chloride ion content analyzer, can also be conductivity meter, chloride ion content analyzer, hardness analysis instrument, alkalinity analyzing instrument,
Transmissometer, sodium ions content analyzer, dioxide-containing silica analyzer or other water quality analyzing instruments, for recirculated water concentration times
The optional water quality parameter of the calculating of rate more horn of plenty；It realizes and automatically controls finally, for recirculated water concentration rate, can keep away completely
Exempt from because manually controlling safety and economic problems caused by bring recirculated cooling water runaways.
Detailed description of the invention
Fig. 1 is control system schematic diagram of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the present invention relates to a kind of recirculated water concentration rate automatic control system, condensate make-up piping 1 is equipped with
First water quality on-line monitoring instrument table 2 is successively arranged the second water quality on-line monitoring instrument table 4 on sewerage pipeline 3 and with PCL controller
6 electric control valve 5；First water quality on-line monitoring instrument table, 2 measurement data is exported to PLC controller 6；Second water quality
4 measurement data of on-line monitoring instrument is exported to PLC controller 6.
The operation principle of the present invention is that: the first water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4 will acquisitions
Data be transferred to PLC controller 3, after PLC controller 3 calculates recirculated water concentration rate, according to recirculated water concentration rate
The aperture of control range adjustment electric control valve 5: when recirculated water concentration rate is higher than control range, increase electric control valve 5
Aperture, increase cooling water blowdown flow rate；When recirculated water concentration rate is less than control range, reduce the aperture of electric control valve 5,
Reduce cooling water blowdown flow rate.Finally make the control of recirculated water concentration rate in claimed range.
Claims (4)
1. a kind of recirculated water concentration rate automatic control system, it is characterised in that: including be arranged on condensate make-up piping 1 first
Water quality on-line monitoring instrument table 2, the second water quality on-line monitoring instrument table 4 being successively set on sewerage pipeline 3 and with PCL controller
6 electric control valve 5；The first water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4 connect PCL controller
6, the measurement data of the first water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4 is exported to PLC controller 6.
2. a kind of recirculated water concentration rate automatic control system according to claim 1, it is characterised in that: described first
Water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4 are same type measuring instrumentss, using conductivity meter, chloride ion
Content analyzer, hardness analysis instrument, alkalinity analyzing instrument, transmissometer, sodium ions content analyzer or dioxide-containing silica analyzer.
3. a kind of control method of recirculated water concentration rate automatic control system described in claim 1, it is characterised in that: first
The data of acquisition are transferred to PLC controller 6, PLC control by water quality on-line monitoring instrument table 2 and the second water quality on-line monitoring instrument table 4
After device 6 calculates recirculated water concentration rate, the aperture of electric control valve 5 is adjusted according to the control range of recirculated water concentration rate:
When recirculated water concentration rate is higher than control range, increase the aperture of electric control valve 5, increases Circulating water effluent amount；Work as circulation
When water concentration rate is less than control range, reduce the aperture of electric control valve 5, reduces Circulating water effluent amount, finally make recirculated water
Concentration rate controls in claimed range.
4. control method according to claim 3, it is characterised in that: the recirculated water concentration rate calculation formula is such as
Under:
K=A1/A0
In formula: A1--- the measured value of the first water quality on-line monitoring instrument table 2；A0--- the measurement of the second water quality on-line monitoring instrument 4
Value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811071449.1A CN109240358A (en) | 2018-09-14 | 2018-09-14 | A kind of recirculated water concentration rate automatic control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811071449.1A CN109240358A (en) | 2018-09-14 | 2018-09-14 | A kind of recirculated water concentration rate automatic control system and method |
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| CN109240358A true CN109240358A (en) | 2019-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811071449.1A Pending CN109240358A (en) | 2018-09-14 | 2018-09-14 | A kind of recirculated water concentration rate automatic control system and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111666669A (en) * | 2020-05-29 | 2020-09-15 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating water cooling system through concentration ratio |
| JP2020189260A (en) * | 2019-05-20 | 2020-11-26 | アクアス株式会社 | Device and method for controlling water quality of cooling tower water |
| CN113405852A (en) * | 2021-07-21 | 2021-09-17 | 西安热工研究院有限公司 | Automatic pressure-reducing, flow-limiting and sampling device and method for high-temperature and high-pressure fluid |
| CN113566639A (en) * | 2021-07-01 | 2021-10-29 | 深圳中广核工程设计有限公司 | Method and system for controlling circulating water discharge capacity of closed cooling tower |
| CN114264189A (en) * | 2021-12-27 | 2022-04-01 | 中国建筑设计研究院有限公司 | Automatic pollution discharge control device and method for cooling tower |
| CN114910531A (en) * | 2022-04-07 | 2022-08-16 | 浙江西热利华智能传感技术有限公司 | Chloride ion sensor-based concentration ratio online detection system and detection method |
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| CN104991579A (en) * | 2015-07-03 | 2015-10-21 | 西安西热水务环保有限公司 | System and method for controlling concentration ratio of open type circulating cooling water system |
| CN208654653U (en) * | 2018-09-14 | 2019-03-26 | 西安热工研究院有限公司 | A kind of recirculated water concentration rate automatic control equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020189260A (en) * | 2019-05-20 | 2020-11-26 | アクアス株式会社 | Device and method for controlling water quality of cooling tower water |
| JP7284634B2 (en) | 2019-05-20 | 2023-05-31 | アクアス株式会社 | Cooling tower water quality control device and its water quality control method |
| CN111666669A (en) * | 2020-05-29 | 2020-09-15 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating water cooling system through concentration ratio |
| CN113566639A (en) * | 2021-07-01 | 2021-10-29 | 深圳中广核工程设计有限公司 | Method and system for controlling circulating water discharge capacity of closed cooling tower |
| CN113566639B (en) * | 2021-07-01 | 2023-11-24 | 深圳中广核工程设计有限公司 | Method and system for controlling circulating water discharge capacity of closed cooling tower |
| CN113405852A (en) * | 2021-07-21 | 2021-09-17 | 西安热工研究院有限公司 | Automatic pressure-reducing, flow-limiting and sampling device and method for high-temperature and high-pressure fluid |
| CN114264189A (en) * | 2021-12-27 | 2022-04-01 | 中国建筑设计研究院有限公司 | Automatic pollution discharge control device and method for cooling tower |
| CN114264189B (en) * | 2021-12-27 | 2024-01-26 | 中国建筑设计研究院有限公司 | Automatic pollution discharge control device and method for cooling tower |
| CN114910531A (en) * | 2022-04-07 | 2022-08-16 | 浙江西热利华智能传感技术有限公司 | Chloride ion sensor-based concentration ratio online detection system and detection method |
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