CN113655821A - Automatic control device and control method for concentration ratio of industrial circulating water - Google Patents
Automatic control device and control method for concentration ratio of industrial circulating water Download PDFInfo
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- CN113655821A CN113655821A CN202110998568.7A CN202110998568A CN113655821A CN 113655821 A CN113655821 A CN 113655821A CN 202110998568 A CN202110998568 A CN 202110998568A CN 113655821 A CN113655821 A CN 113655821A
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- circulating water
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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
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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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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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
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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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
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/05—Conductivity or salinity
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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
- C02F2209/44—Time
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Abstract
The invention discloses an automatic control device and a control method for concentration ratio of industrial circulating water. The device comprises a sampling unit, a pollution discharge unit and a control unit; the sampling unit comprises a fouling thermal resistance online measuring instrument, a circulating water salinity online measuring instrument, a supplementing water salinity online measuring instrument and a sampling pipe; the sampling pipe is sequentially connected with a dirt thermal resistance online measuring instrument, a circulating water salt content online measuring instrument and a basin of an industrial circulating water tower; the online salt content measuring instrument of the make-up water is arranged on a circulating water make-up water pipeline of the industrial circulating water tower; the sewage discharge unit comprises a sewage discharge pipe, and the sewage discharge pipe is arranged on a water outlet pipe of the circulating water salt content online measuring instrument; the control unit comprises a touch screen and a PLC controller, and the PLC controller is electrically connected with the make-up water salinity online measuring instrument and the circulating water salinity online measuring instrument. The method can conveniently realize the automatic control of the concentration ratio of the industrial circulating water under the condition of no need of manual intervention.
Description
Technical Field
The invention relates to the technical field of concentration ratio pollution discharge in industrial circulating water, in particular to an automatic control device and a control method for concentration ratio of industrial circulating water.
Background
At present, most industrial circulating water systems are extensive in operation and management, a circulating water pollution discharge door is still manually operated for controlling the concentration rate of circulating water, the change of a site is difficult to deal with, a data result has great hysteresis, and the concentration rate cannot be accurately controlled for discharging the sewage. The manual control pollution discharge easily causes insufficient or excessive pollution discharge, and leads to overhigh or overlow concentration ratio. The risk of scaling and corrosion of the system is increased due to the overhigh concentration ratio, scaling and corrosion faults of equipment are caused, and economic loss is caused; the concentration rate is too low, the utilization rate of circulating water is reduced, the running risk of the system can be increased or the emission exceeds the standard, and the waste of water resources is caused.
Because the change of unit load, external temperature and atmospheric humidity etc. can influence the concentrated multiplying power of industrial circulating water, circulating water system self has too big hysteresis quality simultaneously, leads to the unable accurate control of operating personnel to blow off the volume, increases worker intensity of labour simultaneously, forms the potential safety hazard.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the automatic control device and the control method for the concentration ratio of the industrial circulating water.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic control device for concentration ratio of industrial circulating water comprises a sampling unit, a sewage discharge unit and a control unit;
the sampling unit comprises a fouling thermal resistance online measuring instrument, a circulating water salt content online measuring instrument, a supplementing water salt content online measuring instrument and a sampling pipe; one end of the sampling pipe is communicated with a water outlet of a circulating water pump of the industrial circulating water tower, and a water inlet of the circulating water pump is connected with a basin of the industrial circulating water tower; the water outlet of the circulating water pump is also communicated with a spraying device in the industrial circulating water tower; the other end of the sampling pipe is sequentially connected with a fouling thermal resistance online measuring instrument, a circulating water salt content online measuring instrument and a basin of an industrial circulating water tower; the online salt content measuring instrument of the make-up water is arranged on a circulating water make-up water pipeline of the industrial circulating water tower;
the sewage discharge unit comprises a sewage discharge pipe, and the sewage discharge pipe is arranged on a water outlet pipe of the circulating water salt content online measuring instrument;
the control unit comprises a PLC controller which is electrically connected with the make-up water salinity online measuring instrument and the circulating water salinity online measuring instrument.
As a further improvement of the invention, the sewage discharge pipe is provided with a sewage discharge electric valve, and the PLC is electrically connected with the sewage discharge electric valve.
As a further improvement of the invention, the sampling pipe is also provided with a sampling inlet valve and a sampling outlet valve; the sampling inlet valve is arranged between the circulating water pump and the fouling thermal resistance online measuring instrument, the sampling outlet valve is arranged on a water outlet pipe of the circulating water salt content online measuring instrument, and the drain pipe is connected between the circulating water salt content online measuring instrument and the sampling outlet valve.
As a further improvement of the invention, the circulating water make-up water pipeline is directly connected with a basin of the industrial circulating water tower.
As a further improvement of the invention, the control unit further comprises a touch screen, and the touch screen is electrically connected with the PLC.
A control method of an automatic control device for concentration ratio of industrial circulating water comprises the following steps:
sampling the salt content of the circulating water at an outlet of the circulating water pump and an outlet of the make-up water by using an online salt content measuring instrument, and processing two salt content signals;
updating the sampling values of the salt content of the circulating water, the sampling value of the salt content of the supplementing water and the sampling value R of the dirt thermal resistance at intervals of sampling time T1, and calculating the sampling values at the moment
And setting a control parameter concentration multiplying factor Kn and a fouling thermal resistance multiplying factor Kr according to a difference value delta n between the control parameter concentration multiplying factor Kn and the expected value, selecting and calculating the opening time T2 of the required sewage valve in the sampling period according to a value of a formula T2 which is delta n multiplied by Kn + R multiplied by Kr, namely finishing the sewage control in the sampling period, and entering the next sampling period until the calculated value of the concentration multiplying factor of the circulating water is smaller than the expected value of the concentration multiplying factor.
As a further improvement of the invention, the method comprises the following specific steps:
setting an expected value of the concentration ratio of the industrial circulating water, sampling time T1 and corresponding control parameters Kn and Kr;
starting the fouling thermal resistance online measuring instrument, the circulating water salt content online measuring instrument and the make-up water salt content online measuring instrument to start sampling, starting timing T1, updating the fouling thermal resistance, the circulating water salt content and the make-up water salt content sampling values in the PLC when the timing T1 is equal to the set sampling time T1, stopping counting T1 and enabling T1 to be 0; obtaining the difference delta n between the concentration multiplying power n and the expected value;
setting control parameters Kn and Kr, selecting and calculating the opening time T2 of the sewage valve required in the sampling period according to the value of a formula T2 which is delta n multiplied by Kn + R multiplied by Kr, starting the sewage pipe and timing T2, closing the sewage pipe and making T2 equal to 0 when the timing T2 is equal to T2, starting timing T1 again, and sampling pH again; and when the delta n is less than or equal to 0, restarting timing t1, and sampling the fouling thermal resistance, the circulating water salinity and the make-up water salinity again.
Compared with the prior art, the invention has the following advantages:
the device of the invention is characterized in that a sampling pipe is arranged on a water outlet of a circulating water pump, an on-line measuring instrument for the thermal resistance of dirt and an on-line measuring instrument for the salt content of circulating water are sequentially arranged on the sampling pipe to test the thermal resistance of dirt and the salt content of circulating water, and the opening and closing of a drain pipe are controlled according to the comparison between the salt content of make-up water and the salt content of circulating water by a PLC (programmable logic controller). The device is simple and practical and control the concentrated multiplying power degree of accuracy of circulating water high, adjustment circulating water blowdown amount that can be accurate quick satisfies the requirement of the concentrated multiplying power control of industrial circulating water. Compared with the existing industrial circulating water concentration ratio control system, the timing sampling of circulating water salt content, make-up water salt content and fouling thermal resistance is added, each sampling period T1 enables the timing sampling values of the circulating water salt content, make-up water salt content and fouling thermal resistance in the PLC to be updated, the time for starting the sewage discharge electric valve in the sampling period is calculated, then the next sampling period is started again until the concentration ratio calculation value is smaller than the concentration ratio set value, and therefore the control requirement of the circulating water concentration ratio is met.
The control method of the invention is adopted to segment the circulating water concentration ratio system with large hysteresis into the control of the concentration ratio in each sampling period, calculate the opening time required by the sewage discharge electric valve in each sampling period, reduce the hysteresis of the industrial circulating water system, improve the rapidity and the accuracy of the concentration ratio of the industrial circulating water, reduce the workload of operators and improve the safety and the economy of the operation of the industrial circulating water.
Drawings
FIG. 1 is an automatic control device for concentration ratio of industrial circulating water;
FIG. 2 is a flow chart of an automatic control method for concentration ratio of industrial circulating water.
The method comprises the following steps of 1, a touch screen; 2. a PLC controller; 3. the salt content of the make-up water is measured on line; 4. an online measuring instrument for the salt content of the circulating water; 5. a blowdown electric valve; 6. a sampling outlet valve; 7. an industrial circulating water tower; 8. a water circulating pump; 9. a sample inlet valve; 10. dirt thermal resistance on-line measuring instrument.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the automatic control device for concentration ratio of industrial circulating water of the present invention comprises a sampling unit, a sewage discharging unit and a control unit.
The sampling unit comprises a circulating water pump 8 outlet and an industrial circulating water tower 7 which are communicated with each other through a pipeline, and the communicating pipeline is sequentially provided with a sampling inlet valve 9, a dirt thermal resistance online measuring instrument 10, a circulating water salt content online measuring instrument 4 and a sampling outlet valve 6; and a salt content online measuring instrument 3 of the make-up water is added on a circulating water make-up water pipeline.
The blowdown unit includes that the pipeline increases the tee bend between circulating water salt content on-line measuring instrument 4 and sampling outlet valve 6, draws forth a way pipeline to drain, increases blowdown motorised valve 5 on the pipeline, has guaranteed that the circulating water blowdown can electric control.
The control unit comprises a touch screen 1 and a PLC (programmable logic controller) 2, the PLC 2 is connected with a make-up water salt content online measuring instrument 3, a circulating water salt content online measuring instrument 4 and a sewage discharge electric valve 5.
The automatic control method based on the automatic control device for the concentration ratio of the industrial circulating water comprises the following steps:
the device uses a salt content online measuring instrument to sample the salt content of the circulating water at the outlet of the circulating water pump and the outlet of the make-up water, two salt content signals are sent to a PLC (programmable logic controller), a control method designed for a large-lag system is used, the sampling time T1, the control parameter concentration ratio coefficient Kn and the fouling thermal resistance ratio coefficient Kr are designed in advance, the time T2 required for opening the electric blowdown valve in each sampling period T1 is calculated, and the automatic control of the industrial circulating water concentration ratio is realized. The method can conveniently realize the automatic control of the concentration ratio of the industrial circulating water under the condition of no need of manual intervention.
The following description will further describe an embodiment of the present invention with reference to fig. 1 and 2.
Examples
As shown in the attached figure 1, when the industrial circulating water concentration ratio automatic control device is put into operation, the sampling inlet valve 9 and the sampling outlet valve 6 are opened, whether the sampling value of the salt content of the circulating water, the sampling value of the salt content of the supplementing water and the sampling value of the dirt thermal resistance are consistent with the display of the online measuring instrument is confirmed on the touch screen 1, and after the consistency is confirmed, the industrial circulating water automatic control device can be put into automatic operation.
As shown in fig. 2, the sampling values of the salt content of the circulating water, the sampling value of the salt content of the supplementing water and the sampling value R of the fouling resistance are updated every sampling period T1, and the calculation is carried out at the moment
And (3) selecting and calculating control parameters Kn and Kr set in the PLC according to a value of a formula T2 (delta n multiplied by Kn + R multiplied by Kr) and a control parameter Kr set in the PLC, selecting and calculating the opening time T2 of the sewage valve required in the sampling period, finishing the sewage control in the sampling period, and entering the next sampling period until the calculated value of the concentration ratio of the circulating water is less than the expected value of the concentration ratio, namely meeting the control requirement of the concentration ratio of the industrial circulating water.
The method comprises the following specific steps:
an expected value of the concentration multiplying power of the industrial circulating water is set on the touch screen 1, the PLC controls sampling time T1 and corresponding control parameters Kn and Kr.
Clicking an automatic operation button, starting the fouling thermal resistance online measuring instrument 10, the circulating water salt content online measuring instrument 4 and the make-up water salt content online measuring instrument 3 to start sampling, starting timing T1 by the PLC controller 2, and when the timing T1 is equal to the set sampling time T1, updating the sampling values of the fouling thermal resistance, the circulating water salt content and the make-up water salt content in the PLC controller 2, stopping counting T1 and enabling T1 to be 0. To obtain this time
The difference deltan from the desired value,
and (3) setting control parameters Kn and Kr in the PLC, selecting and calculating the opening time T2 of the required blowdown valve in the sampling period according to the value of the formula T2 which is delta n multiplied by Kn + R multiplied by Kr, opening the electric blowdown valve 5 and timing T2, closing the electric blowdown valve 5 and making T2 equal to 0 when the timing T2 is equal to T2, starting timing T1 again, and sampling the pH value again.
And when the delta n is less than or equal to 0, indicating that the concentration multiplying power reaches the expected value, restarting timing t1 without opening the electric blowdown valve 5, and sampling the fouling thermal resistance, the circulating water salinity and the make-up water salinity again.
In summary, the apparatus of the present invention comprises: comprises a sampling unit, a pollution discharge unit and a control unit; the sampling unit comprises a circulating water pump, a dirt thermal resistance online measuring instrument, a circulating water salinity online measuring instrument and a supplementing water salinity online measuring instrument. The inlet and the outlet of the circulating water pump are both communicated with the industrial circulating water tower through pipelines; the online measuring instrument for the salt content of the circulating water and the online measuring instrument for the fouling resistance are arranged on an outlet pipeline of the circulating water pump; the online salt content measuring instrument of the make-up water is arranged on a pipeline from the make-up water to the industrial circulating water tower. The sewage discharge unit comprises a sewage discharge electric valve, and the sewage discharge electric valve is communicated with the sewage discharge ditch; the control unit comprises a touch screen and a PLC (programmable logic controller), the touch screen is in communication connection with the PLC, and the PLC is electrically connected with the thermal resistance online measuring instrument, the circulating water salinity online measuring instrument, the make-up water salinity online measuring instrument and the sewage drainage electric valve. The method can conveniently realize the automatic control of the concentration ratio of the industrial circulating water under the condition of no need of manual intervention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An automatic control device for concentration ratio of industrial circulating water is characterized by comprising a sampling unit, a sewage discharge unit and a control unit;
the sampling unit comprises a fouling thermal resistance online measuring instrument, a circulating water salt content online measuring instrument, a supplementing water salt content online measuring instrument and a sampling pipe; one end of the sampling pipe is communicated with a water outlet of a circulating water pump of the industrial circulating water tower, and a water inlet of the circulating water pump is connected with a basin of the industrial circulating water tower; the water outlet of the circulating water pump is also communicated with a spraying device in the industrial circulating water tower; the other end of the sampling pipe is sequentially connected with a fouling thermal resistance online measuring instrument, a circulating water salt content online measuring instrument and a basin of an industrial circulating water tower; the online salt content measuring instrument of the make-up water is arranged on a circulating water make-up water pipeline of the industrial circulating water tower;
the sewage discharge unit comprises a sewage discharge pipe, and the sewage discharge pipe is arranged on a water outlet pipe of the circulating water salt content online measuring instrument;
the control unit comprises a PLC controller which is electrically connected with the make-up water salinity online measuring instrument and the circulating water salinity online measuring instrument.
2. The automatic control device for concentration ratio of industrial circulating water according to claim 1, wherein the blow-off pipe is provided with a blow-off electric valve, and the PLC is electrically connected with the blow-off electric valve.
3. The automatic control device for concentration rate of industrial circulating water according to claim 1, wherein the sampling pipe is further provided with a sampling inlet valve and a sampling outlet valve; the sampling inlet valve is arranged between the circulating water pump and the fouling thermal resistance online measuring instrument, the sampling outlet valve is arranged on a water outlet pipe of the circulating water salt content online measuring instrument, and the drain pipe is connected between the circulating water salt content online measuring instrument and the sampling outlet valve.
4. The automatic control device for concentration ratio of industrial circulating water according to claim 1, wherein the circulating water make-up water pipeline is directly connected with a basin of an industrial circulating water tower.
5. The automatic control device for concentration ratio of industrial circulating water according to claim 1, wherein the control unit further comprises a touch screen, and the touch screen is electrically connected with the PLC.
6. A control method of an automatic control device for concentration ratio of industrial circulating water is characterized by comprising the following steps:
sampling the salt content of the circulating water at an outlet of the circulating water pump and an outlet of the make-up water by using an online salt content measuring instrument, and processing two salt content signals;
updating the sampling values of the salt content of the circulating water, the sampling value of the salt content of the supplementing water and the sampling value R of the dirt thermal resistance at intervals of sampling time T1, and calculating the sampling values at the moment
And setting a control parameter concentration multiplying factor Kn and a fouling thermal resistance multiplying factor Kr according to a difference value delta n between the control parameter concentration multiplying factor Kn and the expected value, selecting and calculating the opening time T2 of the required sewage valve in the sampling period according to a value of a formula T2 which is delta n multiplied by Kn + R multiplied by Kr, namely finishing the sewage control in the sampling period, and entering the next sampling period until the calculated value of the concentration multiplying factor of the circulating water is smaller than the expected value of the concentration multiplying factor.
7. The control method of the automatic control device for the concentration ratio of the industrial circulating water according to claim 6 is characterized by comprising the following specific steps:
setting an expected value of the concentration ratio of the industrial circulating water, sampling time T1 and corresponding control parameters Kn and Kr;
starting the fouling thermal resistance online measuring instrument, the circulating water salt content online measuring instrument and the make-up water salt content online measuring instrument to start sampling, starting timing T1, updating the fouling thermal resistance, the circulating water salt content and the make-up water salt content sampling values in the PLC when the timing T1 is equal to the set sampling time T1, stopping counting T1 and enabling T1 to be 0; obtaining the difference delta n between the concentration multiplying power n and the expected value;
setting control parameters Kn and Kr, selecting and calculating the opening time T2 of the sewage valve required in the sampling period according to the value of a formula T2 which is delta n multiplied by Kn + R multiplied by Kr, starting the sewage pipe and timing T2, closing the sewage pipe and making T2 equal to 0 when the timing T2 is equal to T2, starting timing T1 again, and sampling pH again;
and when the delta n is less than or equal to 0, restarting timing t1, and sampling the fouling thermal resistance, the circulating water salinity and the make-up water salinity again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110998568.7A CN113655821A (en) | 2021-08-27 | 2021-08-27 | Automatic control device and control method for concentration ratio of industrial circulating water |
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| CN202110998568.7A CN113655821A (en) | 2021-08-27 | 2021-08-27 | Automatic control device and control method for concentration ratio of industrial circulating water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114702145A (en) * | 2022-03-30 | 2022-07-05 | 中电(四会)热电有限责任公司 | Industrial circulating water quality monitoring device and control method |
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| CN112062252A (en) * | 2020-09-03 | 2020-12-11 | 西安热工研究院有限公司 | Automatic control device and control method for pH of industrial circulating water |
| CN112321028A (en) * | 2020-11-23 | 2021-02-05 | 西安西热水务环保有限公司 | Zero outer system of arranging of thermal power plant's circulating water based on digital real time monitoring |
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2021
- 2021-08-27 CN CN202110998568.7A patent/CN113655821A/en active Pending
Patent Citations (4)
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| WO2015083775A1 (en) * | 2013-12-05 | 2015-06-11 | 三菱重工業株式会社 | Salt concentration adjustment device for recirculated water use system and recirculated water use system |
| 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 |
| CN112062252A (en) * | 2020-09-03 | 2020-12-11 | 西安热工研究院有限公司 | Automatic control device and control method for pH of industrial circulating water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114702145A (en) * | 2022-03-30 | 2022-07-05 | 中电(四会)热电有限责任公司 | Industrial circulating water quality monitoring device and control method |
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