CN106292455B - A kind of ammonification of direct current cooker condensed water personalizes inspection type intelligence control system and control method - Google Patents
A kind of ammonification of direct current cooker condensed water personalizes inspection type intelligence control system and control method Download PDFInfo
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- CN106292455B CN106292455B CN201610859457.7A CN201610859457A CN106292455B CN 106292455 B CN106292455 B CN 106292455B CN 201610859457 A CN201610859457 A CN 201610859457A CN 106292455 B CN106292455 B CN 106292455B
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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
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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Abstract
The invention discloses a kind of direct current cooker condensed waters to ammoniate personalize inspection type intelligence control system and control method, comprising: flowmeter, for acquiring the real-time traffic Q of condensate pump；First conductivity meter, second conductivity meter, third conductivity meter, DCS controller, AC converter, it is connected respectively with DCS controller and dosing metering pump, for receiving the speed-frequency signal of DCS controller sending, adjusts the frequency of dosing motors of metering pumps revolving speed, the present invention can be according to operating condition adjust automatically condensed water ammonia residual, the hysteresis quality manually adjusted and non-timely is avoided, saves a large amount of human cost, the stabilization for realizing direct current cooker condensed water pH value is precisely controlled.
Description
Technical field
The invention belongs to Ion exchange resin fields, and in particular to and the pH value of direct current cooker condensed water controls, in particular to and one
Kind direct current cooker condensed water ammoniates personalize inspection type intelligence control system and control method.
Background technique
With Thermal Power Station's parameter, the raising of capacity and the application of direct current cooker, the quality of boiler feedwater is proposed
Increasingly higher demands are equipped with condensed water treating device in direct current cooker unit, to remove metal erosion in condensed water production
Object and oligodynamical salt, so that the quality of condensed water reaches the requirement of boiler feedwater.Since entire therrmodynamic system is mainly by steel
Made of iron, although each system all uses a variety of anti-corrosion measures, slight corrosion is still unavoidable from, in order to prevent
With mitigation water to corrosion of metal, condensate system is generally used alkaline operation mode, i.e., ammonia is added into condensed water, keeps
The pH value of water is 9.0~9.6, and in the case, most of iron, copper are all present in water in the form of metal oxide, make steel
The corrosion rate of iron and copper is in lower range.Therefore, the control of direct current cooker condensed water pH value is extremely important, and essence is metastable
PH value can greatly reduce the generation of metal erosion fouling condition, reduce boiler and Waterwall tube failure, turbine blade corrosion occur
The probability that situations such as fouling occurs.
Currently, there are mainly two types of the controls of direct current cooker condensed water pH value: manually to manually adjust, operations staff passes through one kind
The height of pH value manually adjusts the frequency of ammonification pump to realize that condensed water pH value controls；Another kind is PID control, ammonification pump root
PID adjusting is carried out according to the variation of condensed water pH value.But manually adjustment pH value is affected by human factors larger and operates
Carry out large labor intensity, debugging is not in time or misoperation easily leads to pH value deviation control range, and it is metastable to be difficult to realize essence
Control, and the control mode that PID is adjusted is affected by P, I parameter setting, needs to fully consider the hysteresis quality of pH variation, work
Personnel are often unfamiliar with technique, are difficult in view of this problem, and from the point of view of the use of part power plant, since pH value variation is stagnant
The presence of property afterwards also fluctuates larger situation with PID control it is easy to appear pH value, this can all influence furnace water quality, directly makes
Corrode at water circulation system and boiler steam equipment, damage is even resulted in when serious.Therefore, it is necessary to one kind can be precisely controlled directly
Flow the control method of condensed water in boiler pH value.
Summary of the invention
For above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of direct current cooker condensed waters to add
Ammonia personalizes inspection type intelligence control system and control method, and the control system and method can be according to operating condition adjust automaticallies
Condensed water ammonia residual avoids the hysteresis quality manually adjusted and non-timely, saves a large amount of human cost, realize direct current pot
The stabilization of furnace condensed water pH value is precisely controlled.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of ammonification of direct current cooker condensed water personalizes inspection type intelligence control system, comprising:
Flowmeter is arranged on the pipeline of condensate pump main water outlet pipe, for acquiring the real-time traffic Q of condensate pump；
First conductivity meter, setting are being concentrated at sampling rack, and the pipeline of precision processing system main water outlet pipe is arranged in sample point
On, for acquiring the conductivity value κ before precision processing system water outlet ammoniates1；
Second conductivity meter is connected with ammonia spirit case, for acquiring the conductivity value κ in ammonia spirit case2；
Third conductivity meter, setting are being concentrated at sampling rack, after precision processing system water outlet chemical feeding points are arranged in sample point
On main pipe pipeline, for acquiring the conductivity value κ after precision processing system water outlet ammoniates3；
DCS controller, for receiving flowmeter, the first conductivity meter, the second conductivity meter and the acquisition of third conductivity meter
Data, and export speed-frequency signal to AC converter after carrying out comprehensive operation to acquisition data；
AC converter is connected with DCS controller and dosing metering pump respectively, for receiving the sending of DCS controller
Speed-frequency signal adjusts the frequency of dosing motors of metering pumps revolving speed.
The dosing metering pump is also connected with ammonia spirit case and chemical feeding points.
Main pipe pipeline after the chemical feeding points is connected with oxygen-eliminating device.
The main water outlet pipe of the condensate pump is connected with the water inlet main pipe of precision processing system.
Precision processing bypass is provided between the water-in and water-out main pipe of the precision processing system.
The quantity of the dosing metering pump is at least 2.
The invention also discloses a kind of direct current cooker condensed waters to ammoniate the inspection type intelligent control method that personalizes, including as follows
Step:
1) condensate pump is acquired by flowmeter, the first conductivity meter, the second conductivity meter and third conductivity meter respectively
Real-time traffic Q, precision processing system water outlet ammonification before conductivity value κ1, conductivity value κ in ammonia spirit case2And precision processing
Conductivity value κ after system water outlet ammonification3, and by the data feedback collected to DCS controller；
2) DCS controller carries out the ammonification base frequency that dosing metering pump is calculated and direct current pot to collected data
Furnace condensed water ammonification after pH value, and in each polling period by the direct current cooker condensed water being calculated ammonification after pH value with
The upper limit value and lower limit value of preset pH value control range are compared, and are exported according to the result of the comparison to AC converter
Speed-frequency signal；
The calculation formula of the ammonification base frequency of the dosing metering pump are as follows:
In formula, κ1For polisher water, conductivity value before ammoniating, unit is μ S/cm,
κ2For the conductivity value in ammonia spirit case, unit is μ S/cm,
Q be condensate pump real-time traffic, unit t/h,
PH is the median of preset pH value control range,
Intrinsic parameter of the maximum dosage of dosing metering pump for dosing metering pump, unit L/h,
The setting stroke of dosing metering pump is set at dosing Metering Pump Stroke adjusting rod, unit %；
The calculation formula of pH value after the direct current cooker condensed water ammonification are as follows:
PH=8.566+lg κ after the ammonification of direct current cooker condensed water3,
In formula, κ3For the conductivity value after condensed water ammonification, unit is μ S/cm；
3) AC converter carries out the frequency of dosing metering pump after receiving the speed-frequency signal that DCS controller issues
It is automatic to correct.
When pH value is higher than upper limit value after the direct current cooker condensed water ammonification being calculated in step 2), then by dosing metering pump
Ammonification base frequency reduced according to the adjusting amplitude of setting it is primary；PH value is low after the direct current cooker condensed water ammonification being calculated
When lower limit value, then the ammonification base frequency of dosing metering pump is increased according to the adjusting amplitude of setting primary；It is calculated
PH value is higher than lower limit value after the ammonification of direct current cooker condensed water, and when being lower than upper limit value, then the ammonification base frequency of dosing metering pump is not
It is adjusted.
The present invention is using condensed water pH value as control target value, with the pH value after flow and ammonification to the frequency of dosing metering pump
Rate carries out dual variation method, first according to real-time traffic Q and conductivity value κ1、κ2Calculate the dosing frequency of dosing metering pump, and root
According to conductivity value κ3PH value after calculating the ammonification of direct current cooker condensed water, then by calculated pH in each polling period
Value is compared with the upper limit value of preset pH value control range and lower limit value, according to the result of the comparison to having calculated that
The frequency of dosing metering pump is corrected automatically, to realize the accurate stability contorting of condensed water pH value；Pass through DCS control system
Realize a kind of inspection type intelligent control that personalizes of condensed water pH value.
Compared with prior art, the present invention at least has the advantages that
Direct current cooker condensed water of the invention, which ammoniates the inspection type intelligence control system that personalizes, will manually adjust intelligence, and
Structure is relatively easy, is not required to increase many complex devices, operate convenient for operations staff；The control system is controlled by DCS
Device controls the real-time change of the frequency following flow of dosing metering pump and changes, and pH value variation lag issues is overcome, by adding
The variation feedback of pH value carries out micro additivity correction control to the frequency of dosing metering pump after ammonia, guarantees pH value precisely stable control
System, to realize essence by carrying out bivariate coordinated control system with frequency of the pH value after flow and ammonification to dosing metering pump
Quasi- dosage control, reduces the fluctuation range of condensed water pH value；The control system uses being capable of precise measurement conductivity value
PH value is obtained with calculation and replaces the ammonia concn and pH value that are not easy precise measurement, ensure that the accurate stability contorting of pH value；
In addition, this kind of control mode may extend to the control system for adding drugs of same type, if direct current cooker water supply ammoniates, middle water adds lime etc.
System.
Further, the quantity of dosing metering pump of the invention is at least 2, has one can be used as in practical applications
Spare, stand-by pump can be when other dosing metering pumps damage or break down alternatively, enhancing the stabilization of direct current cooker
Property.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
The inspection type intelligence control system as shown in Figure 1, direct current cooker condensed water ammonification of the invention personalizes, comprising:
Flowmeter is arranged on the pipeline of condensate pump main water outlet pipe, for acquiring the real-time traffic Q of condensate pump；
First conductivity meter, setting are being concentrated at sampling rack, and the pipeline of precision processing system main water outlet pipe is arranged in sample point
On, for acquiring the conductivity value κ before precision processing system water outlet ammoniates1；
Second conductivity meter is connected with ammonia spirit case, for acquiring the conductivity value κ in ammonia spirit case2；
Third conductivity meter, setting are being concentrated at sampling rack, after precision processing system water outlet chemical feeding points are arranged in sample point
On main pipe pipeline, for acquiring the conductivity value κ after precision processing system water outlet ammoniates3；
DCS controller, for receiving flowmeter, the first conductivity meter, the second conductivity meter and the acquisition of third conductivity meter
Data, and export speed-frequency signal to AC converter after carrying out comprehensive operation to acquisition data；
AC converter is connected with DCS controller and dosing metering pump respectively, for receiving the sending of DCS controller
Speed-frequency signal adjusts the frequency of dosing motors of metering pumps revolving speed.
The dosing metering pump is also connected with ammonia spirit case and chemical feeding points.
Main pipe pipeline after the chemical feeding points is connected with oxygen-eliminating device.
The main water outlet pipe of the condensate pump is connected with the water inlet main pipe of precision processing system.
Precision processing bypass is provided between the water-in and water-out main pipe of the precision processing system, when precision processing system is stopped transport, water
Thus therrmodynamic system is bypassed into.
After the present invention ammoniates condensed water pH value as control target value, firstly, by flowmeter, the first conductivity meter,
Before second conductivity meter and third conductivity meter acquire the real-time traffic Q of condensate pump, precision processing system water outlet ammonification respectively
Conductivity value κ1, conductivity value κ in ammonia spirit case2With the conductivity value κ after precision processing system water outlet ammonification3, and will acquisition
Obtained data feedback is to DCS controller；DCS controller is according to real-time traffic Q and conductivity value κ1、κ2Condensed water is calculated to add
The ammonification base frequency of medicine metering pump, calculation formula are as follows:
In formula,
κ1For polisher water, conductivity value (μ S/cm) before ammoniating,
κ2To prepare the conductivity value (μ S/cm) inside ammonia spirit case when ammonium hydroxide,
Q is condensate pump real-time traffic (t/h),
PH is the median of preset pH value control range, as Once-through Boiler condensed water pH value needs to control in 9.2-
Between 9.6, then the pH value in formula is 9.4,
The maximum dosage of dosing metering pump is the intrinsic parameter of dosing metering pump, determines number at dosing metering pump nameplate
Value, unit L/h,
The setting stroke of dosing metering pump is set at dosing Metering Pump Stroke adjusting rod, unit %；
DCS controller is also according to conductivity value κ simultaneously3PH value after calculating the ammonification of direct current cooker condensed water, calculates
Formula is as follows:
PH=8.566+lg κ after the ammonification of direct current cooker condensed water3
In formula, κ3For the conductivity value (μ S/cm) after condensed water ammonification；
It can be seen that DCS controller carries out dual variation method with frequency of the pH value after flow and ammonification to dosing metering pump, so
Afterwards in each polling period by after calculated ammonification pH value and preset pH value control range upper limit value and
Lower limit value is compared, and according to the result of the comparison to the control signal of AC converter output speed-frequency, AC converter exists
The frequency of dosing metering pump is corrected automatically after receiving the speed-frequency signal that DCS controller issues, to control condensation
The ammonification frequency of water dosing metering pump realizes the accurate stability contorting of condensed water pH value.
The upper limit value and lower limit value of condensed water pH value of the invention, for example the control range of condensed water pH value is set as
9.2~9.3, upper limit value is 9.3, and lower limit value is 9.2；
Polling period is the cycle time by target value compared with upper limit value and lower limit value, i.e. condensed water dosing in the present invention
It measures the period of pump frequency adjustment, pH value starts the interval time changed, that is, water sample after which is traditionally arranged to be ammonification
The time of third conductivity meter is flowed to from sample point, this is because the conductance that the pH value after ammonification is measured according to third conductivity meter
Rate value κ3It is calculated, there is a sampling pipe after chemical feeding points, concentration sampling is delivered to by the water sample after sampling pipe dosing
Monitoring time is arranged to the time that water sample flows to from sample point third conductivity meter, such energy by the third conductivity meter at frame
It is enough to eliminate from dosing to the hysteresis quality of sample water monitoring, guarantee the accuracy of adjustment.
Adjusting amplitude is the amplitude set of single adjustment in the present invention, i.e., in each dosing metering pump frequency adjustment period
Adjustment amplitude, the size of the parameter determine the precision of adjustment.
After setting every numerical value, the operation present invention, intelligence control system can be in each polling period by target value
It makes comparisons with upper limit value and lower limit value, if target value is higher than upper limit value, by the base frequency of condensed water dosing pump according to setting
Fixed adjusting amplitude reduces once, if target value is lower than lower limit value, by the base frequency of condensed water dosing pump according to setting
Adjusting amplitude increase primary, if target value is higher than lower limit value, be lower than upper limit value, then by the basis of condensed water dosing metering pump
For frequency without adjustment, above-mentioned all adjustment are accumulation adjustment, if target value is above upper limit value in three periods, then will
The cumulative adjusting amplitude three times of base frequency.
The above examples are only used to illustrate the technical scheme of the present invention, range and is not intended to limit the present invention, Ren Heben
Field technical staff can make various replacements and modification, therefore guarantor of the invention without departing from the spirit and scope of the present invention
Shield range should be defined by the scope defined by the claims..
Claims (7)
- A kind of control method of inspection type intelligence control system 1. direct current cooker condensed water ammonification personalizes, which is characterized in that institute Stating the direct current cooker condensed water ammonification inspection type intelligence control system that personalizes includes:Flowmeter is arranged on the pipeline of condensate pump main water outlet pipe, for acquiring the real-time traffic Q of condensate pump；First conductivity meter, setting are being concentrated at sampling rack, and sample point is arranged on the pipeline of precision processing system main water outlet pipe, uses Conductivity value κ before acquisition precision processing system water outlet ammonification1；Second conductivity meter is connected with ammonia spirit case, for acquiring the conductivity value κ in ammonia spirit case2；Third conductivity meter, setting are being concentrated at sampling rack, and the main pipe after precision processing system water outlet chemical feeding points is arranged in sample point On pipeline, for acquiring the conductivity value κ after precision processing system water outlet ammoniates3；DCS controller, for receiving the number of flowmeter, the first conductivity meter, the second conductivity meter and the acquisition of third conductivity meter According to, and speed-frequency signal is exported to AC converter after carrying out comprehensive operation to acquisition data；AC converter is connected with DCS controller and dosing metering pump respectively, for receiving the revolving speed of DCS controller sending Frequency signal adjusts the frequency of dosing motors of metering pumps revolving speed；Include the following steps:1) reality of condensate pump is acquired respectively by flowmeter, the first conductivity meter, the second conductivity meter and third conductivity meter Conductivity value κ before Shi Liuliang Q, precision processing system water outlet ammonification1, conductivity value κ in ammonia spirit case2And precision processing system Conductivity value κ after water outlet ammonification3, and by the data feedback collected to DCS controller；2) DCS controller carries out the ammonification base frequency that dosing metering pump is calculated to collected data and direct current cooker is solidifying PH value after bearing water ammonification, and by pH value after the direct current cooker condensed water being calculated ammonification in each polling period and in advance The upper limit value and lower limit value of the pH value control range of setting are compared, and export revolving speed to AC converter according to the result of the comparison Frequency signal；The calculation formula of the ammonification base frequency of the dosing metering pump are as follows:In formula, κ1For polisher water, conductivity value before ammoniating, unit is μ S/cm,κ2For the conductivity value in ammonia spirit case, unit is μ S/cm,Q be condensate pump real-time traffic, unit t/h,PH is the median of preset pH value control range,Intrinsic parameter of the maximum dosage of dosing metering pump for dosing metering pump, unit L/h,The setting stroke of dosing metering pump is set at dosing Metering Pump Stroke adjusting rod, unit %；The calculation formula of pH value after the direct current cooker condensed water ammonification are as follows:PH=8.566+lg κ after the ammonification of direct current cooker condensed water3,In formula, κ3For the conductivity value after condensed water ammonification, unit is μ S/cm；3) AC converter carries out the frequency of dosing metering pump after receiving the speed-frequency signal that DCS controller issues automatic It corrects.
- The control of inspection type intelligence control system 2. a kind of direct current cooker condensed water ammonification according to claim 1 personalizes Method, which is characterized in that introduce manual inspection mechanism, after condensed water is ammoniated in pH and each polling period of control range value into Row compares, and carries out automatic deviation correction to the base frequency for calculating resulting dosing metering pump:When pH value is higher than upper limit value after the direct current cooker condensed water ammonification being calculated in step 2), then by dosing metering pump Base frequency reduces primary according to the adjusting amplitude of setting；PH value is lower than lower limit after the direct current cooker condensed water ammonification being calculated When value, then the ammonification base frequency of dosing metering pump is increased according to the adjusting amplitude of setting primary；The direct current pot being calculated PH value is higher than lower limit value after the ammonification of furnace condensed water, and when being lower than upper limit value, then the ammonification base frequency of dosing metering pump is without adjusting It is whole.
- The control of inspection type intelligence control system 3. a kind of direct current cooker condensed water ammonification according to claim 1 personalizes Method, which is characterized in that the dosing metering pump is also connected with ammonia spirit case and chemical feeding points.
- The control of inspection type intelligence control system 4. a kind of direct current cooker condensed water ammonification according to claim 1 personalizes Method, which is characterized in that the main pipe pipeline after the chemical feeding points is connected with oxygen-eliminating device.
- The control of inspection type intelligence control system 5. a kind of direct current cooker condensed water ammonification according to claim 1 personalizes Method, which is characterized in that the main water outlet pipe of the condensate pump is connected with the water inlet main pipe of precision processing system.
- The control of inspection type intelligence control system 6. a kind of direct current cooker condensed water ammonification according to claim 5 personalizes Method, which is characterized in that precision processing bypass is provided between the water-in and water-out main pipe of the precision processing system.
- The control of inspection type intelligence control system 7. a kind of direct current cooker condensed water ammonification according to claim 1 personalizes Method, which is characterized in that the quantity of the dosing metering pump is at least 2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107153085A (en) * | 2017-05-23 | 2017-09-12 | 中国大唐集团科学技术研究院有限公司华东分公司 | Thermal power plant condensate polishing treatment separate unit mixed bed water outlet conductivity control method |
| CN108196600B (en) * | 2017-12-28 | 2022-03-25 | 深圳春沐源控股有限公司 | Fertilizer regulation and control method and device, electronic equipment and computer readable storage medium |
| 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 |
| CN108167169A (en) * | 2018-03-05 | 2018-06-15 | 中芳特纤股份有限公司 | A kind of metering pump control system for accurately controlling flow |
| 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 |
| CN110045596A (en) * | 2019-05-13 | 2019-07-23 | 中冶南方都市环保工程技术股份有限公司 | Condensate polishing treatment control system and method |
| 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 |
| CN113063139A (en) * | 2021-03-10 | 2021-07-02 | 华电电力科学研究院有限公司 | Intelligent dosing method for boiler |
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