CN109521813A - A kind of system and method for thermal power plant recirculated water concentration rate stability contorting - Google Patents
A kind of system and method for thermal power plant recirculated water concentration rate stability contorting Download PDFInfo
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Abstract
The present invention relates to a kind of system and method for thermal power plant recirculated water concentration rate stability contorting, this method comprises: obtaining the historical data of thermal power generation unit circulation rate of water make-up, water amount of blowdown and cooling tower liquid level, the real time data of circulation evaporation windage loss amount is calculated by way of water balance, to evaporate windage loss amount as dependent variable, using the on-line parameter closely related with thermal power generation unit evaporation loss as independent variable, circulation water evaporation windage loss prediction model is established；Dynamic simulation test is carried out to circulation, obtain the reasonable value of the concentration rate of circulation, using the value as the input value of circulation water evaporation windage loss prediction model, the real-time rate of water make-up and water amount of blowdown of circulation is calculated, to regulate and control water.The present invention can maintain thermal power plant recirculated water concentration rate stability contorting for a long time, have apparent water-saving result, while can prevent condenser tube materials fouling corrosion.
Description
Technical field
The invention belongs to Industrial Water Saving technical fields more particularly to a kind of thermal power plant recirculated water concentration rate to stablize control
The system and method for system.
Background technique
Thermal power plant is industrial water rich and influential family, from economical operation and protection environment, saves power generation water meaning weight
Greatly.In all water systems in thermal power plant, recirculating cooling water system water consumption is maximum, therefore is directed to recirculating cooling water system
Transformation on economy of water cousumption be thermal power plant save water emphasis.
In recirculating cooling water system operational process, the water inlet of system is the moisturizing of cooling tower, and water outlet includes mainly two parts,
A part is evaporation windage loss (also including filter loss), and another part is the sewerage of recirculated water.Under accidental conditions,
The water inlet of circulation should be equal to evaporation the sum of windage loss and sewerage.
In the case where thermal power plant unit service condition determines, evaporation windage loss is to determine value, then circulating water
The water-saving result of system is mainly reflected in the blowdown of control loop water.The water-saving result of circulation is usually with concentration rate
Size is measured.Under the premise of ignoring evaporation windage loss carrying salinity, concentration rate is equal to circulating cooling make-up water amount and blowdown
The ratio of water.Therefore, the concentration rate for improving cooling water, can obviously reduce water amount of blowdown and rate of water make-up, obtain good section
Water effect.
But with the continuous improvement of concentration rate, the salt content in recirculated water is also continuously improved, when salt content reaches certain
When degree, circulation is faced with the problems such as corrosion and fouling.So the water-saving key of recirculating cooling water system be
Under the premise of the problems such as not generating corrosion and fouling, a high position for concentration rate is maintained to stablize.In actual moving process, even if dense
Demagnification rate is fluctuated in a short time to a low value, and water consumption can also offset high concentration ratio in significant period of time and run
Under water-saving amount；In addition, can also face circulation corrosion knot even if concentration rate is fluctuated in a short time to a high level
The risk of dirt.Therefore, the stability contorting for realizing thermal power generation unit recirculated water concentration rate, can not only reduce blowdown flow rate, save
About power generation water, while condenser tube materials fouling corrosion can be prevented.
Currently, the usual manner for maintaining recirculated water concentration rate stable is in timing Manual analysis recirculated water and supplement water
Chlorine ion concentration (ratio of the two is concentration rate) determines blowdown flow rate by the size of concentration rate.This hand sampling
The mode of analysis is Discontinuous sampling, and being regulated in this way concentration rate, there are apparent hysteresis quality and unstability.In addition,
Also have and monitored on-line using chloride ion-selective electrode, but since circulating water quality is more severe, so that in-line meter drift is asked
Topic is serious, and electrode is not sufficiently stable, and need to often be replaced, and price is also more expensive, is not suitable for industrial application.
Summary of the invention
The object of the present invention is to provide a kind of system and method for thermal power plant recirculated water concentration rate stability contorting, adopt
It is realized with the mode for establishing circulation water evaporation windage loss prediction model in conjunction with the reasonable value of the recirculated water concentration rate of setting
The real-time Accurate Prediction of circulating cooling make-up water amount and water amount of blowdown installs online conductivity additional additionally by recirculated water and supplement water
Measuring instrument realizes the feedback regulation to concentration rate, to realize the simple accurate stable control of recirculated water concentration rate.
The present invention provides a kind of methods of thermal power plant recirculated water concentration rate stability contorting, comprising:
Step 1, the history number of thermal power generation unit circulation rate of water make-up, water amount of blowdown and cooling tower liquid level is obtained
According to, be calculated by way of water balance circulation evaporation windage loss amount real time data, to evaporate windage loss
Amount is dependent variable, using the on-line parameter closely related with thermal power generation unit evaporation loss as independent variable, establishes circulation water evaporation
Windage loss prediction model；
Step 2, dynamic simulation test is carried out to circulation, obtains the reasonable value of the concentration rate of circulation,
Using the value as circulation water evaporation windage loss prediction model input value, be calculated circulation real-time rate of water make-up and
Water amount of blowdown, to regulate and control water.
Further, step 2 further include:
Real-time online monitored conductivity is carried out to recirculated water and supplement water, by recirculated water and the supplement online electrical conductivity ratio of water
If it is small to be compared with the reasonable value of the concentration rate of setting average value of the difference of the two within a hour as value of feedback
In 0.5, then using the electrical conductivity ratio as circulation water evaporation windage loss prediction model input value, real-time moisturizing is calculated
Amount and water amount of blowdown, to regulate and control water.
Further, the on-line parameter closely related with thermal power generation unit evaporation loss include unit load, circulation it is cold
But water is to any group in the out temperature of condenser, main steam flow, unit vacuum degree, condensing water flow and total Feedwater Flow
It closes.
Further, circulation water evaporation windage loss prediction model modeling method is multiple linear regression, decision tree, nerve
Any one in network, Bayes and support vector machines or combination.
Further, circulation water evaporation windage loss amount is by quantity of circulating water windage loss corresponding with different type cooling tower
The product of rate obtains.
The present invention also provides a kind of system of thermal power plant recirculated water concentration rate stability contorting, including perception are single
Member, control unit and execution unit；
Sension unit includes the online flow instrument being installed on circulating cooling make-up water and sewerage pipeline and online conductivity
Instrument, online flow instrument and online conductivity meter are respectively used to the flow and conductance of acquisition circulating cooling make-up water and sewerage
Rate, and the flow signal of acquisition and conductivity signal are sent to control unit；
Control unit includes host computer, and host computer is loaded with circulation water evaporation windage loss prediction model, and control unit is used
Windage loss amount is evaporated in real time in unit is calculated based on the on-line parameter closely related with thermal power generation unit evaporation loss,
Rate of water make-up needed for unit is calculated according to the concentration rate of setting and water amount of blowdown, and recirculated water is mended into water discharging valve regulation and is referred to
Order is sent to the execution unit；
Execution unit includes the autocontrol valve being installed on circulating cooling make-up water pipeline and sewerage pipeline, is automatically controlled
Valve, which is used to mend water discharging valve regulation and control instruction according to the recirculated water received, regulates and controls water by control valve aperture.
Further, control unit is also used to:
The relationship for mending drain discharge and valve opening percentage is established, the rate of water make-up being calculated and water amount of blowdown are converted
For the percentage of valve opening, valve opening signal is sent to execution unit.
Further, control unit is also used to:
The electrical conductivity ratio that recirculated water and circulating cooling make-up water are calculated based on conductivity signal, by electrical conductivity ratio and setting
Concentration rate is compared, if average value of the difference of the two within a hour less than 0.5, by electrical conductivity ratio and in real time
Evaporation windage loss amount, which combines, calculates rate of water make-up and water amount of blowdown, to regulate and control to valve；If the difference of the two is one
Average value in a hour is greater than 0.5, then issues alarm signal, and operator is reminded to carry out inspection dimension to online conductivity meter
It repairs.
According to the above aspect of the present invention, passing through the system and method for thermal power plant recirculated water concentration rate stability contorting, Neng Gouchang
Time maintains thermal power plant recirculated water concentration rate stability contorting, has apparent water-saving result, while can prevent condensing
Device tubing fouling corrosion.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is a kind of systematic difference instance graph of thermal power plant recirculated water concentration rate stability contorting of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
A kind of method for present embodiments providing thermal power plant recirculated water concentration rate stability contorting, comprising:
Step 1, the history number of thermal power generation unit circulation rate of water make-up, water amount of blowdown and cooling tower liquid level is obtained
According to, be calculated by way of water balance circulation evaporation windage loss amount real time data, to evaporate windage loss
Amount is dependent variable, using the on-line parameter closely related with thermal power generation unit evaporation loss as independent variable, establishes circulation water evaporation
Windage loss prediction model；
Step 2, dynamic simulation test is carried out to circulation, obtains the reasonable value of the concentration rate of circulation,
Using the value as circulation water evaporation windage loss prediction model input value, be calculated circulation real-time rate of water make-up and
Water amount of blowdown, to regulate and control water.
By the method for the thermal power plant recirculated water concentration rate stability contorting, thermal power plant can be maintained for a long time
Recirculated water concentration rate stability contorting has apparent water-saving result, while can prevent condenser tube materials fouling corrosion.
In the present embodiment, step 2 further include:
Real-time online monitored conductivity is carried out to recirculated water and supplement water, by recirculated water and the supplement online electrical conductivity ratio of water
If it is small to be compared with the reasonable value of the concentration rate of setting average value of the difference of the two within a hour as value of feedback
In 0.5, then using the electrical conductivity ratio as circulation water evaporation windage loss prediction model input value, real-time moisturizing is calculated
Amount and water amount of blowdown, to regulate and control water.
In the present embodiment, the on-line parameter closely related with thermal power generation unit evaporation loss includes unit load, follows
Ring cooling water appointing into the out temperature of condenser, main steam flow, unit vacuum degree, condensing water flow and total Feedwater Flow
Meaning combination.
In the present embodiment, circulation water evaporation windage loss prediction model modeling method be multiple linear regression, decision tree,
Any one in neural network, Bayes and support vector machines or combination.
In the present embodiment, circulation water evaporation windage loss amount is by quantity of circulating water wind corresponding with different type cooling tower
The product of loss late obtains.
To join shown in Fig. 1, the present embodiment additionally provides a kind of system of thermal power plant recirculated water concentration rate stability contorting,
Including sension unit, control unit and execution unit；
Sension unit includes the online flow instrument being installed on circulating cooling make-up water and sewerage pipeline and online conductivity
Instrument, online flow instrument and online conductivity meter are respectively used to the flow and conductance of acquisition circulating cooling make-up water and sewerage
Rate, and the flow signal of acquisition and conductivity signal are sent to control unit；
Control unit includes host computer, and host computer is loaded with circulation water evaporation windage loss prediction model, and control unit is used
Windage loss amount is evaporated in real time in unit is calculated based on the on-line parameter closely related with thermal power generation unit evaporation loss,
Rate of water make-up needed for unit is calculated according to the concentration rate of setting and water amount of blowdown, and recirculated water is mended into water discharging valve regulation and is referred to
Order is sent to the execution unit；
Execution unit includes the autocontrol valve being installed on circulating cooling make-up water pipeline and sewerage pipeline, is automatically controlled
Valve, which is used to mend water discharging valve regulation and control instruction according to the recirculated water received, regulates and controls water by control valve aperture.
By the system of the thermal power plant recirculated water concentration rate stability contorting, thermal power plant can be maintained for a long time
Recirculated water concentration rate stability contorting has apparent water-saving result, while can prevent condenser tube materials fouling corrosion.
In the present embodiment, control unit is also used to:
The relationship for mending drain discharge and valve opening percentage is established, the rate of water make-up being calculated and water amount of blowdown are converted
For the percentage of valve opening, valve opening signal is sent to execution unit.
In the present embodiment, control unit is also used to:
The electrical conductivity ratio that recirculated water and circulating cooling make-up water are calculated based on conductivity signal, by electrical conductivity ratio and setting
Concentration rate is compared, if average value of the difference of the two within a hour less than 0.5, by electrical conductivity ratio and in real time
Evaporation windage loss amount, which combines, calculates rate of water make-up and water amount of blowdown, to regulate and control to valve；If the difference of the two is one
Average value in a hour is greater than 0.5, then issues alarm signal, and operator is reminded to carry out inspection dimension to online conductivity meter
It repairs.
In a certain specific embodiment, online ultrasonic flow instrument and online conductance are installed additional on circulating cooling make-up water pipeline
Rate instrument installs online ultrasonic flow instrument additional on Circulating water effluent waterpipe, in the water inlet line of recirculated water to condenser
Sampling lateral on install online conductivity meter additional, instrument all has the function of wireless remote transmission signal.By circulating cooling make-up water
It is automatic adjustment valve with the replacing valve on sewerage pipeline.
Arrange that a host computer, loaded cycle water evaporation windage loss prediction model acquire unit in water processing control room
The parameters such as unit load, the out temperature of recirculated cooling water to condenser, main steam flow and condensing water flow are made in DCS system
For input variable, unit is calculated and evaporates windage loss amount in real time.Dynamic simulation test is carried out to circulation, obtains fire
The concentration rate reasonable value of power generator group circulation is 4.5.Evaporate windage loss amount and concentration times in real time in conjunction with unit
Rate of water make-up and water amount of blowdown needed for unit is calculated in rate 4.5.
Rate of water make-up needed for unit and water amount of blowdown are converted into recirculated water and mend draining control valve door opening amount signal, is and guided certainly
Dynamic control valve completes runoff investigation.
By the conductivity signal real-time transmission of recirculated water and circulating cooling make-up water to host computer and calculate its ratio, host computer control
The ratio and concentration rate 4.5 are compared by system processed, if average value of the difference of the two within a hour is less than
0.5, then electrical conductivity ratio is calculated into rate of water make-up and sewerage as input signal and in conjunction with real-time evaporation windage loss amount
It measures and valve is regulated and controled；If average value of the difference of the two within a hour is greater than 0.5, alarm signal is issued, is mentioned
The operator that wakes up carries out maintenance and inspection to conductivity table.
Present invention process process is simple and reliable, and investment operating cost is low, overcomes hand sampling analysis chloride ion mode and deposits
The obvious lag of concentration rate control and unstable problem, overcome chloride ion-selective electrode on-line monitoring mode and exist
Instrument drift is serious, problem of unstable, the expensive and unsuitable industrial application of electrode.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of method of thermal power plant recirculated water concentration rate stability contorting characterized by comprising
Step 1, the historical data of thermal power generation unit circulation rate of water make-up, water amount of blowdown and cooling tower liquid level is obtained, is led to
Cross water balance mode be calculated circulation evaporation windage loss amount real time data, using evaporate windage loss amount as because
Variable establishes circulation water evaporation wind damage using the on-line parameter closely related with thermal power generation unit evaporation loss as independent variable
Lose prediction model；
Step 2, dynamic simulation test is carried out to circulation, the reasonable value of the concentration rate of circulation is obtained, with this
It is worth the input value as circulation water evaporation windage loss prediction model, real-time rate of water make-up and the blowdown of circulation is calculated
Water, to regulate and control water.
2. a kind of method of thermal power plant recirculated water concentration rate stability contorting according to claim 1, feature exist
In the step 2 further include:
To recirculated water and supplement water carry out real-time online monitored conductivity, using recirculated water and supplement the online electrical conductivity ratio of water as
If value of feedback is compared the difference of the two with the reasonable value of the concentration rate of setting, the average value within a hour is less than
0.5, then using the electrical conductivity ratio as the circulation water evaporation windage loss prediction model input value, real-time benefit is calculated
Water and water amount of blowdown, to regulate and control water.
3. a kind of method of thermal power plant recirculated water concentration rate stability contorting according to claim 1 or 2, feature
It is, described includes unit load, recirculated cooling water with the closely related on-line parameter of thermal power generation unit evaporation loss to coagulating
Any combination in the out temperature of vapour device, main steam flow, unit vacuum degree, condensing water flow and total Feedwater Flow.
4. a kind of method of thermal power plant recirculated water concentration rate stability contorting according to claim 1 or 2, feature
It is, the circulation water evaporation windage loss prediction model modeling method is multiple linear regression, decision tree, neural network, shellfish
Any one in Ye Si and support vector machines or combination.
5. a kind of method of thermal power plant recirculated water concentration rate stability contorting according to claim 1 or 2, feature
It is, the water evaporation windage loss amount that recycles is by the product of quantity of circulating water windage loss rate corresponding with different type cooling tower
It obtains.
6. a kind of system of thermal power plant recirculated water concentration rate stability contorting, which is characterized in that including sension unit, control
Unit and execution unit；
The sension unit includes the online flow instrument being installed on circulating cooling make-up water and sewerage pipeline and online conductivity
Instrument, the online flow instrument and online conductivity meter are respectively used to the flow and electricity of acquisition circulating cooling make-up water and sewerage
Conductance, and the flow signal of acquisition and conductivity signal are sent to described control unit；
Described control unit includes host computer, and the host computer is loaded with circulation water evaporation windage loss prediction model, the control
Unit processed evaporates wind for unit to be calculated based on the on-line parameter closely related with thermal power generation unit evaporation loss in real time
Blow loss vector, rate of water make-up needed for unit is calculated according to the concentration rate of setting and water amount of blowdown, and recirculated water is mended and is drained
Valve regulation and control instruction is sent to the execution unit；
The execution unit includes the autocontrol valve being installed on circulating cooling make-up water pipeline and sewerage pipeline, described automatic
Control valve is used to mend water discharging valve regulation and control instruction according to the recirculated water received, by control valve aperture, to water
Regulated and controled.
7. a kind of system of thermal power plant recirculated water concentration rate stability contorting according to claim 6, feature exist
In described control unit is also used to:
The relationship for mending drain discharge and valve opening percentage is established, the rate of water make-up being calculated and water amount of blowdown are converted into valve
The percentage of door aperture, is sent to the execution unit for valve opening signal.
8. a kind of system of thermal power plant recirculated water concentration rate stability contorting according to claim 6, feature exist
In described control unit is also used to:
Based on the conductivity signal calculate recirculated water and circulating cooling make-up water electrical conductivity ratio, by the electrical conductivity ratio with set
Fixed concentration rate is compared, if average value of the difference of the two within a hour less than 0.5, by the Conductivity Ratio
Value calculates rate of water make-up and water amount of blowdown in conjunction with real-time evaporation windage loss amount, to regulate and control to valve；If the two
Average value of the difference within a hour is greater than 0.5, then issues alarm signal, reminds operator to the online conductivity meter
Table carries out maintenance and inspection.
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| CN111178602A (en) * | 2019-12-18 | 2020-05-19 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Circulating water loss prediction method based on support vector machine and neural network |
| CN111573900A (en) * | 2020-05-29 | 2020-08-25 | 中国水利水电科学研究院 | Dynamic regulation and control system and method for concentration multiple of circulating cooling water tower |
| CN111596621A (en) * | 2020-04-13 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Intelligent water affair on-line monitoring, control and management system of thermal power plant |
| CN111649521A (en) * | 2020-05-29 | 2020-09-11 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate |
| CN111680411A (en) * | 2020-05-29 | 2020-09-18 | 鞍钢股份有限公司 | Method for determining pollution discharge rate of circulating water cooling system through temperature concentration rate |
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| CN112484560A (en) * | 2020-10-20 | 2021-03-12 | 浙江中控技术股份有限公司 | Water-saving optimization method and system for industrial circulating water |
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Cited By (13)
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| CN110231069A (en) * | 2019-06-04 | 2019-09-13 | 宋保红 | A kind of accurate measurement method of cooling tower water loss |
| CN111178602A (en) * | 2019-12-18 | 2020-05-19 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Circulating water loss prediction method based on support vector machine and neural network |
| CN111596621A (en) * | 2020-04-13 | 2020-08-28 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Intelligent water affair on-line monitoring, control and management system of thermal power plant |
| CN111573900B (en) * | 2020-05-29 | 2021-12-14 | 中国水利水电科学研究院 | Dynamic regulation and control system and method for concentration multiple of circulating cooling water tower |
| CN111649521A (en) * | 2020-05-29 | 2020-09-11 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate |
| CN111680411A (en) * | 2020-05-29 | 2020-09-18 | 鞍钢股份有限公司 | Method for determining pollution discharge rate of circulating water cooling system through temperature concentration rate |
| CN111573900A (en) * | 2020-05-29 | 2020-08-25 | 中国水利水电科学研究院 | Dynamic regulation and control system and method for concentration multiple of circulating cooling water tower |
| CN111649521B (en) * | 2020-05-29 | 2022-03-22 | 鞍钢股份有限公司 | Method for determining water replenishing rate of circulating water cooling system through temperature concentration rate |
| CN111680411B (en) * | 2020-05-29 | 2023-06-16 | 鞍钢股份有限公司 | Method for determining pollution discharge rate of circulating water cooling system through temperature concentration ratio |
| CN111918522A (en) * | 2020-06-19 | 2020-11-10 | 南方电网科学研究院有限责任公司 | Converter station cooling system |
| CN112484560A (en) * | 2020-10-20 | 2021-03-12 | 浙江中控技术股份有限公司 | Water-saving optimization method and system for industrial circulating water |
| CN112836935A (en) * | 2021-01-07 | 2021-05-25 | 华电电力科学研究院有限公司 | Wisdom water affairs management platform suitable for power plant |
| CN112836935B (en) * | 2021-01-07 | 2023-11-14 | 华电电力科学研究院有限公司 | Wisdom water management platform suitable for power plant |
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