CN111573900A - Dynamic regulation and control system and method for concentration multiple of circulating cooling water tower - Google Patents
Dynamic regulation and control system and method for concentration multiple of circulating cooling water tower Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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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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Abstract
The invention provides a dynamic regulation and control system and a dynamic regulation and control method for the concentration multiple of a circulating cooling water tower. When the conductivity of the circulating cooling water tower obviously rises and is about to exceed a preset upper limit value, pumping water to a water treatment system is increased, water treatment is enhanced, treated purified water is discharged to the circulating cooling water tower through a sewage discharge pipeline, the pH value in the circulating cooling water tower is diluted, the conductivity is obviously reduced until the conductivity reaches a preset lower limit value of the conductivity, the pumping water amount is reduced, and finally the dynamic regulation and control of the concentration multiple of the circulating cooling water tower are realized only by monitoring the conductivity and the pumping water flow of the circulating cooling water tower, so that the double purposes of reducing fresh water supply and realizing water saving and emission reduction are achieved.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a dynamic regulation and control system and method for the concentration multiple of a circulating cooling water tower.
Background
The concentration times (concentration times) is an important index of a circulating cooling water system, and refers to the ratio of the content of a substance concentrated in the circulating cooling water due to evaporation to the content of the same substance in makeup water, or the ratio of the amount of makeup water to the amount of sewage. Since the above-mentioned content ratio of substances or the ratio of the amount of makeup water is difficult to directly monitor, in actual measurement, the ratio of the electric conductivity value of the circulated cooling water to the electric conductivity of the makeup water, or the ratio of potassium ions is generally used.
The concentration multiple of the circulating cooling water is properly improved, so that the consumption of make-up water can be reduced, and water resources are saved; on the other hand, the sewage discharge amount can be reduced, so that the environmental pollution and the wastewater treatment amount are reduced; in addition, the consumption of the water treatment agent can be saved, so that the cost of cooling water treatment is reduced; however, if the concentration factor of the cooling water is excessively increased, the hardness and alkalinity of the cooling water are too high, and the scaling tendency of the water is increased; therefore, in order to ensure the treatment effect of the cooling water, the concentration multiple of the cooling water must be well controlled, generally, the concentration multiple of a thermoelectric system is preferably controlled to be 5-8, and the concentration multiple of a chemical industry and an oil refining system is generally controlled to be 2-4.
Because the water treatment system is also arranged in most industrial enterprises at present, and the zero discharge of sewage is realized in a small part of enterprises, the concentration multiple of the cooling water tower can be dynamically regulated and controlled through the linkage of the cooling water tower and the water treatment system, so that the dual effects of water saving and emission reduction are realized.
Disclosure of Invention
Aiming at the defects in the prior art, the dynamic regulation and control system and the method for the concentration factor of the circulating cooling water tower provided by the invention realize the dynamic regulation and control of the concentration factor of the circulating cooling water tower only by monitoring the conductivity and the pumping flow of the circulating cooling water tower so as to achieve the double purposes of reducing fresh water supply and realizing water saving and emission reduction.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a dynamic regulation and control system for the concentration multiple of a circulating cooling water tower, which comprises the circulating cooling water tower, a water treatment system connected with the circulating cooling water tower through a water pumping pipeline and a water storage and storage tank connected with the water treatment system, wherein the water storage tank is connected with the circulating cooling water tower;
the circulating cooling water tower is characterized in that a conductivity meter is arranged in a water tank of the circulating cooling water tower, and a flowmeter is installed on the water pumping pipeline.
Furthermore, the water treatment system comprises a pretreatment subsystem, a physical treatment subsystem, an ultrafiltration treatment subsystem, a reverse osmosis treatment subsystem and an anion and cation exchange subsystem which are connected in sequence;
the pretreatment subsystem is used for precipitating coarse particulate matters in the filtered water;
the physical treatment subsystem is used for treating fine pollution characteristics in water;
the ultrafiltration processing subsystem is used for processing macromolecular pollutants in water;
the reverse osmosis treatment subsystem is used for treating harmful substances in water;
and the anion and cation exchange subsystem is used for removing anions and cations in water.
Still further, the water treatment system is connected with the water storage and storage tank through a sewage discharge pipeline.
Based on the system, the invention also provides a dynamic regulation and control method for the concentration multiple of the circulating cooling water tower, which comprises the following steps:
s1, arranging a conductivity meter in a water pool of the circulating cooling water tower, and monitoring the conductivity of the circulating cooling water tower in real time by using the conductivity meter;
s2, calculating a first concentration multiple according to the conductivity of the circulating cooling water tower and the conductivity of fresh water make-up water which are monitored in real time;
s3, calculating a second concentration multiple by utilizing the conductivity of the circulating cooling water tower monitored in real time based on the relation between the conductivity of fresh water make-up water and the first concentration multiple;
s4, arranging a water pumping pipeline, installing a flowmeter, pumping water from the circulating cooling water tower to a water treatment system for treatment, and discharging the residual dirty water after treatment to the circulating cooling water tower;
s5, judging whether the conductivity of the circulating cooling water tower is increased and whether the second concentration multiple exceeds a preset upper limit value, if so, entering a step S6, otherwise, entering a step S8;
s6, increasing the pumping flow from the circulating cooling water tower to the water treatment system, discharging the treated purified water to the circulating cooling water tower through the water storage and storage tank, and diluting the pH value in the circulating cooling water tower;
s7, judging whether the conductivity of the circulating cooling water tower is reduced or not and whether the second concentration multiple is reduced to a lower limit value of a preset concentration multiple or not, if so, entering a step S8, otherwise, returning to the step S6;
and S8, reducing the pumping flow from the circulating cooling water tower to the water treatment system, and completing the dynamic regulation and control of the concentration multiple of the circulating cooling water tower.
Further, the expression of the first concentration factor in step S2 is as follows:
N1＝σcold/σSupplement device
In the formula, N1Is the first concentration factor, σColdFor the conductivity, σ, of water in recirculating cooling water towersSupplement deviceThe conductivity of the water is replenished for fresh water.
Still further, the expression of the second concentration multiple in step S3 is as follows:
N2＝k·σcold+b
In the formula, N2Is the second concentration multipleK and b are both constant coefficients, σColdThe conductivity of the water in the recirculating cooling water tower.
Still further, in step S4, the treated dirty water is discharged to a circulating cooling water tower, which specifically includes: and (4) discharging the residual dirty water after treatment to a circulating cooling water tower after precipitation and filtration through a water storage tank.
Still further, step S6 is specifically: the pumping flow from the circulating cooling water tower to the water treatment system is increased, the treated purified water is discharged to a water storage tank through a sewage discharge pipeline, and is discharged to the circulating cooling water tower through precipitation and filtration to dilute the pH value in the cooling water tower.
The invention has the beneficial effects that:
the invention obtains the concentration multiple by monitoring the conductivity calculation of the circulating cooling water tower, sets up the pumping pipeline, and install the flowmeter, pump water from the circulating cooling water tower to the water treatment system, the purified water after processing is supplied to the boiler make-up water, etc., the dirty water (dense water) after processing is still discharged to the cooling water tower after precipitating and filtering. When the conductivity of the circulating cooling water tower obviously rises and is about to exceed a preset upper limit value, pumping water to a water treatment system is increased, water treatment is enhanced, treated purified water is discharged to the circulating cooling water tower through a sewage discharge pipeline, the pH value in the circulating cooling water tower is diluted, the conductivity is obviously reduced until the conductivity reaches a preset lower limit value of the conductivity, the pumping water amount is reduced, and finally the dynamic regulation and control of the concentration multiple of the circulating cooling water tower are realized only by monitoring the conductivity and the pumping water flow of the circulating cooling water tower, so that the double purposes of reducing fresh water supply and realizing water saving and emission reduction are achieved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
As shown in fig. 1, the present invention provides a dynamic regulation and control system for the concentration multiple of a recirculating cooling water tower, which comprises a recirculating cooling water tower, a water treatment system connected with the recirculating cooling water tower through a water pumping pipeline, and a water storage and storage tank connected with the water treatment system, wherein the water storage tank is connected with the recirculating cooling water tower; the water tank of the circulating cooling water tower is provided with a conductivity meter, and a water pumping pipeline is provided with a flowmeter. The water treatment system comprises a pretreatment subsystem, a physical treatment subsystem, an ultrafiltration treatment subsystem, a reverse osmosis treatment subsystem and an anion-cation exchange subsystem which are sequentially connected, the water treatment system is connected with the water storage and storage tank through a sewage discharge pipeline, and the pretreatment subsystem is used for precipitating and filtering coarse particulate matters in water; a physical treatment subsystem for treating fine pollution features in the water; the ultrafiltration processing subsystem is used for processing macromolecular pollutants in water; the reverse osmosis treatment subsystem is used for treating harmful substances in water; and the anion and cation exchange subsystem is used for removing anions and cations in the water.
In the embodiment, the concentration multiple is calculated by monitoring the conductivity of the circulating cooling water tower, the water pumping pipeline is arranged, the flowmeter is installed, water is pumped from the circulating cooling water tower to the water treatment system, the treated purified water is supplied to a boiler for supplementing water and the like, and the treated dirty water (concentrated water) is still discharged to the cooling water tower after being precipitated and filtered. When the conductivity of the circulating cooling water tower obviously rises and is about to exceed a preset upper limit value, pumping water to a water treatment system is increased, water treatment is enhanced, treated purified water is discharged to the circulating cooling water tower through a sewage discharge pipeline, the pH value in the circulating cooling water tower is diluted, the conductivity is obviously reduced until the conductivity reaches a preset lower limit value of the conductivity, the pumping water amount is reduced, and finally the dynamic regulation and control of the concentration multiple of the circulating cooling water tower are realized only by monitoring the conductivity and the pumping water flow of the circulating cooling water tower, so that the double purposes of reducing fresh water supply and realizing water saving and emission reduction are achieved.
In the embodiment, the pretreatment subsystem is used for precipitating and filtering coarse particulate matters such as silt, impurities and the like in water, so that the conductivity of the water is reduced; the physical treatment subsystem is used for treating fine pollutants in the water by a physical method so as to obviously reduce the conductivity of the water; the ultrafiltration processing subsystem is used for processing macromolecular pollutants in water by using a membrane separation technology taking pressure as a driving force, wherein the macromolecular pollutants comprise harmful substances such as bacteria, rust, colloid and the like, so that the conductivity of the water is further remarkably reduced; the reverse osmosis treatment subsystem is used for treating harmful substances such as charged ions, inorganic substances, colloidal particles, bacteria, organic substances and the like in water by using a membrane separation technology mainly based on a reverse osmosis method, so that the conductivity of the water is further greatly reduced; and the anion and cation exchange subsystem is used for further removing most anions and cations in the water through anion and cation exchange resin, so that the conductivity of the water is further reduced to meet the requirement of boiler make-up water.
Example 2
As shown in fig. 2, based on the above system, the present invention further provides a dynamic control method for the concentration factor of the circulating cooling water tower, comprising the following steps:
s1, arranging a conductivity meter in a water pool of the circulating cooling water tower, and monitoring the conductivity of the circulating cooling water tower in real time by using the conductivity meter;
s2, calculating a first concentration multiple according to the conductivity of the circulating cooling water tower and the conductivity of fresh water make-up water which are monitored in real time;
the expression for the first concentration factor is as follows:
N1＝σcold/σSupplement device
In the formula, N1Is the first concentration factor, σColdFor the conductivity, σ, of water in recirculating cooling water towersSupplement deviceReplenishing the conductivity of the water for fresh water;
s3, calculating to obtain a second concentration multiple by utilizing the conductivity of the circulating cooling water tower monitored in real time based on the relation between the conductivity of fresh water make-up water and the first concentration multiple;
in this embodiment, since the conductivity of the make-up water does not vary much, a relatively stable correlation between conductivity and concentration factor can be established, and therefore, the second concentration factor can be estimated by monitoring the conductivity of a single cooling tower, and the expression for the second concentration factor is as follows:
N2＝k·σcold+b
In the formula, N2For the second concentration factor, k and b are constant coefficients, σColdIs the conductivity of water in the circulating cooling water tower;
s4, arranging a water pumping pipeline, installing a flowmeter, pumping water from the circulating cooling water tower to a water treatment system for treatment, and discharging the residual dirty water after treatment to the circulating cooling water tower;
in the embodiment, a water pumping pipeline is arranged, a flowmeter is arranged, water is pumped from a cooling water tower to a water treatment system, treated purified water is used for supplying water to a boiler and the like, and treated dirty water (concentrated water) is still discharged to the cooling water tower after being precipitated and filtered; the water treatment system generally comprises a pretreatment subsystem, a general physical treatment subsystem, an ultrafiltration treatment subsystem, a reverse osmosis treatment subsystem, an anion and cation exchange subsystem and the like.
S5, judging whether the conductivity of the circulating cooling water tower is increased and whether the second concentration multiple exceeds a preset upper limit value, if so, entering a step S6, otherwise, entering a step S8;
s6, increasing the pumping flow from the circulating cooling water tower to the water treatment system, discharging the treated purified water to the circulating cooling water tower through the water storage and storage tank, and diluting the pH value in the circulating cooling water tower;
s7, judging whether the conductivity of the circulating cooling water tower is reduced and whether the second concentration multiple is reduced to a lower limit value of a preset concentration multiple, if so, entering the step S8, otherwise, returning to the step S6;
and S8, reducing the pumping flow from the circulating cooling water tower to the water treatment system, and completing the dynamic regulation and control of the concentration multiple of the circulating cooling water tower.
In this embodiment, when the conductivity of the cooling water tower is significantly increased, and the concentration multiple obtained in step S3 is about to exceed the upper limit value of the preset concentration multiple, pumping water from the cooling water tower to the water treatment system is increased, the treated purified water or the treated water of each subsystem is discharged to the blowdown storage reservoir through the blowdown pipeline, and then is discharged to the circulating cooling water tower through precipitation and filtration, so as to dilute the ph value in the cooling water tower, thereby achieving a significant decrease in the conductivity of the cooling water tower; when the concentration factor obtained in step S3 decreases to the lower limit of the preset concentration factor after the conductivity of the cooling water tower decreases, the water pumped from the cooling water tower is decreased to the water treatment system.
In the embodiment, through the design, the dynamic regulation and control of the concentration multiple of the cooling water tower are realized only by monitoring the conductivity and the pumping flow of the cooling water tower, so that the dual purposes of reducing fresh water supply and saving water and reducing emission are achieved.
Claims (8)
1. A dynamic regulation and control system for the concentration multiple of a circulating cooling water tower is characterized by comprising the circulating cooling water tower, a water treatment system connected with the circulating cooling water tower through a water pumping pipeline and a water storage and storage tank connected with the water treatment system, wherein the water storage tank is connected with the circulating cooling water tower;
the circulating cooling water tower is characterized in that a conductivity meter is arranged in a water tank of the circulating cooling water tower, and a flowmeter is installed on the water pumping pipeline.
2. The dynamic regulation and control system of the concentration multiple of the circulating cooling water tower according to claim 1, wherein the water treatment system comprises a pretreatment subsystem, a physical treatment subsystem, an ultrafiltration treatment subsystem, a reverse osmosis treatment subsystem and an anion-cation exchange subsystem which are connected in sequence;
the pretreatment subsystem is used for precipitating coarse particulate matters in the filtered water;
the physical treatment subsystem is used for treating fine pollution characteristics in water;
the ultrafiltration processing subsystem is used for processing macromolecular pollutants in water;
the reverse osmosis treatment subsystem is used for treating harmful substances in water;
and the anion and cation exchange subsystem is used for removing anions and cations in water.
3. The dynamic control system for concentration factor of a hydronic tower of claim 2, wherein the water treatment system is connected to the reservoir via a blowdown line.
4. A dynamic regulation and control method for the concentration multiple of a circulating cooling water tower is characterized by comprising the following steps:
s1, arranging a conductivity meter in a water pool of the circulating cooling water tower, and monitoring the conductivity of the circulating cooling water tower in real time by using the conductivity meter;
s2, calculating a first concentration multiple according to the conductivity of the circulating cooling water tower and the conductivity of fresh water make-up water which are monitored in real time;
s3, calculating a second concentration multiple by utilizing the conductivity of the circulating cooling water tower monitored in real time based on the relation between the conductivity of fresh water make-up water and the first concentration multiple;
s4, arranging a water pumping pipeline, installing a flowmeter, pumping water from the circulating cooling water tower to a water treatment system for treatment, and discharging the residual dirty water after treatment to the circulating cooling water tower;
s5, judging whether the conductivity of the circulating cooling water tower is increased and whether the second concentration multiple exceeds a preset upper limit value, if so, entering a step S6, otherwise, entering a step S8;
s6, increasing the pumping flow from the circulating cooling water tower to the water treatment system, discharging the treated purified water to the circulating cooling water tower through the water storage and storage tank, and diluting the pH value in the circulating cooling water tower;
s7, judging whether the conductivity of the circulating cooling water tower is reduced or not and whether the second concentration multiple is reduced to a lower limit value of a preset concentration multiple or not, if so, entering a step S8, otherwise, returning to the step S6;
and S8, reducing the pumping flow from the circulating cooling water tower to the water treatment system, and completing the dynamic regulation and control of the concentration multiple of the circulating cooling water tower.
5. The method for dynamically regulating the concentration factor of a recirculating cooling water tower as claimed in claim 4, wherein the expression of the first concentration factor in step S2 is as follows:
N1＝σcold/σSupplement device
In the formula, N1Is the first concentration factor, σColdFor the conductivity, σ, of water in recirculating cooling water towersSupplement deviceThe conductivity of the water is replenished for fresh water.
6. The method for dynamically regulating the concentration factor of a recirculating cooling water tower as claimed in claim 4, wherein the second concentration factor in step S3 is expressed as follows:
N2＝k·σcold+b
In the formula, N2For the second concentration factor, k and b are constant coefficients, σColdThe conductivity of the water in the recirculating cooling water tower.
7. The dynamic control method for the concentration factor of the recycle cooling water tower according to claim 4, wherein the step S4 is to discharge the remaining dirty water after the treatment to the recycle cooling water tower, which specifically comprises: and (4) discharging the residual dirty water after treatment to a circulating cooling water tower after precipitation and filtration through a precipitation storage reservoir.
8. The dynamic control method for the concentration factor of the recirculated cooling water tower according to claim 4, wherein the step S6 is specifically: the pumping flow from the circulating cooling water tower to the water treatment system is increased, the treated purified water is discharged to a water storage tank through a sewage discharge pipeline, and is discharged to the circulating cooling water tower through precipitation and filtration to dilute the pH value in the cooling water tower.
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Cited By (1)
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| CN114485004A (en) * | 2022-02-22 | 2022-05-13 | 中冶长天国际工程有限责任公司 | Sintering plant equipment circulating cooling water system |
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