Circulating water treatment method and system

Abstract

The invention discloses a circulating water treatment method and system. The circulating water treatment method comprises the steps that water quality indexes are detected, and the water quality indexes comprise the pH value, the conductivity, the temperature, the chloride ion concentration, the sulfate radical concentration, the alkalinity, the hardness, the calcium ion concentration and the phosphate radical concentration; sending the water quality index to a water treatment system control terminal, and calculating the ion concentration; calculating equilibrium constants of water at different temperatures, and judging the scaling condition according to the ion concentration and the equilibrium constants; when scaling begins, the electric valve is opened, water enters the filtering system to be filtered, and then scaling ions in the water are removed through electrodialysis. According to the invention, the problems of large water consumption and difficulty in sewage treatment caused by scale formation through quantitative sewage discharge in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a circulating water treatment method and system. Background Art

[0002] Circulating water achieves cooling by evaporating heat, which leads to an increase in the ion concentration in the cooling water. When the ion concentration exceeds the solubility of the corresponding substance, scaling will occur in the cooling water system. The traditional way to solve the scaling problem is to prevent scaling by adding scale inhibitors and quantitative sewage discharge, which will cause three problems: large water consumption, drainage pollution (including pollution caused by the addition of chemicals), and high sewage treatment costs.

[0003] To address the above problems, no effective solutions have been proposed yet. Summary of the invention

[0004] The purpose of the present invention is to provide a circulating water treatment method and system to solve the problem of large water consumption caused by scaling and difficulty in sewage treatment in the related art through quantitative sewage discharge.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A circulating water treatment method comprises: detecting water quality indicators, wherein the water quality indicators include pH value, conductivity, temperature, chloride ion concentration, sulfate concentration, alkalinity, hardness, calcium ion concentration, and phosphate concentration; sending the water quality indicators to a water treatment system control terminal to calculate the ion concentration; calculating the equilibrium constant of water at different temperatures, and judging the scaling condition based on the ion concentration and the equilibrium constant; when scaling begins, opening an electric valve, allowing water to enter a filtration system for filtration, and then removing scaling ions in the water through electrodialysis.

[0007] Furthermore, an iterative algorithm is used to analyze the ion concentration.

[0008] Furthermore, the equilibrium constant at 25 degrees Celsius is obtained, and the equilibrium constant at any temperature is calculated based on the equilibrium constant at 25 degrees Celsius. The calculation formula is: ,in, is the equilibrium constant at 25 degrees Celsius, is the equilibrium constant at any temperature, is the standard enthalpy of formation, is the gas constant, For any temperature.

[0009] Furthermore, the equilibrium constant is compared with the ion concentration to determine the state of the chemical reaction in the water, including: when the equilibrium constant is greater than the ion concentration, scale is dissolved; when the equilibrium constant is less than the ion concentration, scale is generated; when the equilibrium constant is equal to the ion concentration, the reaction stops.

[0010] Furthermore, the voltage of the electrodialysis is adjusted according to the ion concentration to remove the scaling ions in the water in proportion.

[0011] According to another aspect of the present application, a circulating water treatment system is provided. The system includes a circulating pipeline and a filtering pipeline, wherein the circulating pipeline includes a circulating pump, a heat exchanger and a cooling tower connected in sequence, and the filtering pipeline includes a circulating pump, a filtering system, an electrodialysis and a cooling tower connected in sequence, wherein the filtering system includes a sand filter, a disinfection tank and a carbon filter connected in sequence; a water treatment system control terminal controls an electric valve, a rectifier and a water quality detection system.

[0012] It is further configured that: an electric valve is arranged on the branch line connected to the filtering system.

[0013] It is further configured as follows: the electrodialysis is connected to a rectifier.

[0014] It is further configured as: a water treatment system control terminal for controlling an electric valve, a rectifier and a water quality detection system.

[0015] It is further configured as follows: a branch is provided between the circulation pump and the cooling tower to connect to a water quality detection system.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: the setting of the filter pipeline significantly improves the water purification efficiency. The sequential connection of the sand filter, disinfection tank and carbon filter constitutes an efficient water purification chain, which effectively removes large particle impurities, microorganisms and small molecular organic matter in the water, ensuring the purity and safety of the water quality. At the same time, the application of electrodialysis technology further improves the utilization efficiency of water resources, solves the scaling problem of circulating water by adjusting the ion concentration, and meets the high standards of water quality for different users. The introduction of the water treatment system control terminal realizes the intelligent management of the system. By integrating the electric valve, rectifier and water quality detection system, the control terminal can monitor the water quality indicators in real time, and automatically adjust the system parameters according to the preset program, thereby optimizing the operating efficiency. Its remote monitoring and fault diagnosis functions not only improve management efficiency, but also ensure real-time monitoring and emergency response of water quality safety.

[0017] In summary, the present invention can save 90% of water by discharging concentrated water and reusing fresh water. The detection system continuously detects the ion concentration and circulates back and forth. In this way, the circulating cooling water system is free of scaling without adding water treatment agents, while achieving high concentration multiples and near-zero emissions. The water treatment system, with its efficient circulation management, excellent filtering and purification capabilities, and intelligent control methods, achieves the dual guarantee of efficient utilization of water resources and water quality safety, providing solid technical support for environmental protection, energy saving, and water safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a flow chart of a circulating water treatment method;

[0020] Figure 2 A schematic diagram of a circulating water treatment system. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example

[0025] Reference Figure 1 , is a circulating water treatment method disclosed in the present invention, the invention comprises:

[0026] Step S101, detecting water quality indicators, wherein the water quality indicators include pH value, conductivity, temperature, chloride ion concentration, sulfate concentration, alkalinity, hardness, calcium ion concentration, and phosphate concentration;

[0027] Specifically, all water quality indicators are tested online, and then the indicators are controlled by the water treatment system terminal. Four chemical balance calculations are performed based on the water quality indicators: mass balance, charge balance, acid-base balance, and redox balance. An iterative algorithm is used to analyze the ion concentration of all scaling substances in the cooling water.

[0028] Step S102, sending the water quality index to the water treatment system control terminal to calculate the ion concentration;

[0029] Specifically, the water treatment system control terminal uses advanced calculation methods and algorithms to accurately calculate the ion concentration in the water. This precise calculation helps to understand the water quality more accurately and provide strong support for water quality management.

[0030] Step S103, calculating the equilibrium constant of water at different temperatures, and judging the scaling condition according to the ion concentration and the equilibrium constant;

[0031] Specifically, the ion concentration and the equilibrium constant are compared, and when it is found that the reaction is causing scaling, the ion concentration is adjusted to allow the scale to dissolve.

[0032] Step S104, when scaling begins, the electric valve is opened, water enters the filtration system for filtration, and then the scaling ions in the water are removed by electrodialysis.

[0033] Specifically, the water after electrodialysis flows into the cooling tower and returns to the circulation pipeline. At this time, the ion concentration in the water has been reduced, and the water has started to dissolve scale or stopped the reaction. In this way, scaling is reduced. When the ion concentration is less than the equilibrium constant, some of the scale that has been generated will be dissolved.

[0034] Furthermore, an iterative algorithm is used to analyze the ion concentration.

[0035] Specifically, starting from the initial value, the next approximate value of the hydrogen ion concentration is calculated using the iterative formula. After each iteration, the difference between the new approximate value and the previous approximate value is checked. If this difference is less than the predetermined error limit, the iteration is considered to have converged and the calculation can be stopped. If the iteration has not yet converged, the new approximate value is used as the starting point of the next iteration and the above steps are repeated.

[0036] Furthermore, the equilibrium constant at 25 degrees Celsius is obtained, and the equilibrium constant at any temperature is calculated based on the equilibrium constant at 25 degrees Celsius. The calculation formula is: ,in, is the equilibrium constant at 25 degrees Celsius, is the equilibrium constant at any temperature, is the standard enthalpy of formation, is the gas constant, The equilibrium constant is compared with the ion concentration to determine the state of the chemical reaction in the water, including: when the equilibrium constant is greater than the ion concentration, scale is dissolved; when the equilibrium constant is less than the ion concentration, scale is generated; when the equilibrium constant is equal to the ion concentration, the reaction stops.

[0037] Specifically, in chemical reaction equilibrium, for a reversible reaction: , when the reaction reaches equilibrium, there will be ,in, is the equilibrium constant. According to the first and second laws of thermodynamics, the total energy remains constant, but the energy is transferred along the favorable potential energy gradient. Based on the fact that the reaction always proceeds in the direction of decreasing the total free energy of the system, the above chemical reaction is judged Whether to proceed and the direction of the reaction.

[0038] For chemical reactions , , where For the product ( and ) and the total free energy of the reactants ( and ) is the difference in total free energy when The reaction can proceed when When When , the reaction is in equilibrium. According to the formula: ,in, The standard generation free energy (can be found in the tool manual), is the gas constant, is the thermodynamic temperature of the reaction environment. When the reaction is in equilibrium, hour, , , .

[0039] By detecting the ion concentration of the main substances in the scaling chemical reaction in water, the ion concentration value of the current scaling chemical reaction and the scaling chemical reaction equilibrium are calculated. In comparison, ,but , the reaction can proceed when , When , The reaction is in equilibrium.

[0040] According to the tool manual, all scaling chemical reactions in the circulating cooling water at 25°C can be found. Since the temperature of circulating cooling water is constantly changing, it is necessary to calculate the : ,in, is the standard formation enthalpy, which can be found in the tool manual. This is used to calculate the scaling chemical reactions of circulating cooling water at different temperatures. , and then calculate the reaction time according to the ion concentration of the scaling chemical reaction Value, to determine whether the scaling reaction is in progress or has reached equilibrium.

[0041] Furthermore, the voltage of the electrodialysis is adjusted according to the ion concentration to remove the scaling ions in the water in proportion.

[0042] Specifically, when the detected ion concentration is less than the equilibrium constant of the ion at the real temperature ( ) the scale will dissolve; when the detected ion concentration exceeds the equilibrium constant ( ), scale will form. At this time, the water treatment system control terminal will open the electric valve to let the water enter the sand filter to filter out suspended pollutants, continue to remove microbial pollutants through the disinfection tank, and continue to adsorb organic matter and oxidizing pollutants through the carbon filter. After that, the water continues to enter the electrodialysis equipment. At this time, the water treatment system control terminal will dynamically adjust the rectifier voltage based on the ion concentration value, and remove the scaling ions in the water in proportion to ensure that no scaling will form at this ratio.

[0043] Concentrated water is discharged and fresh water is reused, which can save 90% of water. The detection system continuously detects the ion concentration and circulates back and forth. In this way, the circulating cooling water system is free of scaling without adding water treatment agents, and the results of high concentration multiples and near-zero emissions are achieved.

[0044] Reference Figure 2 , is a circulating water treatment system disclosed in the present invention, in which the solid arrows are the flow direction of circulating water, and the dotted arrows are the direction of information transmission. The invention includes:

[0045] The circulation pipeline and the filtration pipeline, the circulation pipeline includes a circulation pump, a heat exchanger and a cooling tower connected in sequence, the filtration pipeline includes a circulation pump, a filtration system, electrodialysis and a cooling tower connected in sequence, wherein the filtration system includes a sand filter, a disinfection tank and a carbon filter connected in sequence; the water treatment system control terminal controls the electric valve, the rectifier and the water quality detection system.

[0046] Specifically, sand filtration can remove large particles of impurities in the water, such as suspended matter and organic matter, and provide pretreatment for subsequent disinfection and carbon filtration. The disinfection pool kills microorganisms in the water, such as bacteria and viruses, by chemical or physical methods, ensuring the sanitation and safety of the water quality. Carbon filtration further adsorbs and removes small molecular organic matter such as residual chlorine, odor, and pigment in the water, improving the purity of the water quality. The application of electrodialysis technology can remove soluble salts and ions in the water, allowing water resources to be used more efficiently. Through the treatment of the filtration pipeline, the system can produce water that meets specific water quality requirements, meeting the water quality requirements of different users or processes.

[0047] It is further configured as follows: an electric valve is provided on the branch connected to the filtration system. The electrodialysis is connected to a rectifier. A branch is provided between the circulation pump and the cooling tower to connect to the water quality detection system. The water treatment system control terminal is used to control the electric valve, the rectifier and the water quality detection system.

[0048] The water treatment system control terminal integrates key equipment such as electric valves, rectifiers, and water quality detection systems, realizing intelligent control of the entire system. Through preset programs and algorithms, the control terminal can automatically adjust parameters such as the opening of the electric valve and the output voltage of the rectifier according to the real-time water quality detection results, thereby optimizing the operating efficiency of the system. The control terminal has remote monitoring and fault diagnosis functions, which can reflect the operating status and potential problems of the system in real time. Managers can remotely control the system, view historical data, analyze system performance, etc. through the control terminal, thereby improving management efficiency and decision-making accuracy. The water quality detection system can monitor various indicators in the water in real time, such as pH value, dissolved oxygen, turbidity, etc., to ensure that the water quality meets relevant standards and requirements. Once the water quality is abnormal, the control terminal can immediately issue an alarm and take corresponding emergency measures, thereby ensuring the safety and stability of the water quality.

[0049] The working principle and beneficial effects of the present invention are:

[0050] The setting of the filtration pipeline significantly improves the water purification efficiency. The sequential connection of sand filtration, disinfection pool and carbon filtration constitutes an efficient water purification chain, which effectively removes large particle impurities, microorganisms and small molecular organic matter in the water, ensuring the purity and safety of the water quality. At the same time, the application of electrodialysis technology further improves the utilization efficiency of water resources, solves the scaling problem of circulating water by adjusting the ion concentration, and meets the high standards of water quality for different users. The introduction of the water treatment system control terminal realizes the intelligent management of the system. By integrating electric valves, rectifiers and water quality detection systems, the control terminal can monitor water quality indicators in real time, and automatically adjust system parameters according to preset programs to optimize operating efficiency. Its remote monitoring and fault diagnosis functions not only improve management efficiency, but also ensure real-time monitoring and emergency response of water quality safety.

[0051] In summary, the present invention can save 90% of water by discharging concentrated water and reusing fresh water. The detection system continuously detects the ion concentration and circulates back and forth. In this way, the circulating cooling water system is free of scaling without adding water treatment agents, while achieving high concentration multiples and near-zero emissions. The water treatment system, with its efficient circulation management, excellent filtering and purification capabilities, and intelligent control methods, achieves the dual guarantee of efficient utilization of water resources and water quality safety, providing solid technical support for environmental protection, energy saving, and water safety.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circulating water treatment method, characterized in that: include: Detecting water quality indicators, wherein the water quality indicators include pH value, conductivity, temperature, chloride ion concentration, sulfate concentration, alkalinity, hardness, calcium ion concentration, and phosphate concentration; Sending the water quality index to the water treatment system control terminal to calculate the ion concentration; Calculating the equilibrium constant of water at different temperatures, and judging the scaling condition according to the ion concentration and the equilibrium constant; Calculate the equilibrium constant of water at different temperatures, and judge the scaling condition according to the ion concentration and the equilibrium constant, including: obtain the equilibrium constant at 25 degrees Celsius, calculate the equilibrium constant at any temperature according to the equilibrium constant at 25 degrees Celsius, and the calculation formula is: ,in, is the equilibrium constant at 25 degrees Celsius, is the equilibrium constant at any temperature, is the standard enthalpy of formation, is the gas constant, Any temperature; Comparing the equilibrium constant with the ion concentration to determine the chemical reaction state in the water, including: when the equilibrium constant is greater than the ion concentration, scale is dissolved; when the equilibrium constant is less than the ion concentration, scale is generated; when the equilibrium constant is equal to the ion concentration, the reaction stops; When scaling begins, open the electric valve, the water enters the filtration system for filtration, and then electrodialysis is used to remove scaling ions in the water.

2. A circulating water treatment method according to claim 1, characterized in that: include: An iterative algorithm is used to analyze the ion concentrations.

3. A circulating water treatment method according to claim 1, characterized in that When scaling begins, the electric valve is opened, and water enters the filtration system for filtration, and then undergoes electrodialysis to remove scaling ions in the water, including: The voltage of electrodialysis is adjusted according to the ion concentration to remove scaling ions in water in proportion.

4. A circulating water treatment system, applied to a circulating water treatment method as described in any one of claims 1 to 3, characterized in that: include: A circulation pipeline and a filtration pipeline, wherein the circulation pipeline comprises a circulation pump, a heat exchanger and a cooling tower connected in sequence, and the filtration pipeline comprises a circulation pump, a filtration system, an electrodialysis and a cooling tower connected in sequence, wherein the filtration system comprises a sand filter, a disinfection tank and a carbon filter connected in sequence; The water treatment system control terminal controls the electric valve, rectifier and water quality detection system.

5. A circulating water treatment system according to claim 4, characterized in that: include: The electric valve is arranged on the branch line connected to the filtering system.

6. A circulating water treatment system according to claim 4, characterized in that: include: The electrodialysis is connected to the rectifier.

7. A circulating water treatment system according to claim 4, characterized in that: include: The water treatment system control terminal is used to control the electric valve, rectifier and water quality detection system.

8. A circulating water treatment system according to claim 4, characterized in that: include: A branch is provided between the circulation pump and the cooling tower to connect with the water quality detection system.

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