Physical and chemical treatment device for circulating cooling water of power plant

Abstract

The utility model discloses a power plant circulating cooling water physicochemical treatment device which comprises a circulating water tank 1, a circulating water pump 2 and a circulating water pump 3, an input port of the cyclone set 4 is connected with the circulating water pool 1 through a pipeline, a circulating water pump 2 is arranged between the circulating water pool 1 and the cyclone set 4, and the circulating water pump 2 is used for pumping circulating cooling water into the cyclone set 4; the hydrodynamic cavitator group 5 is arranged above the hydrocyclone group 4, and an input port of the hydrodynamic cavitator group 5 is connected with an upper output port of the hydrocyclone group 4 through a pipeline; the first filter 6-1 is arranged below the cyclone group 4, an input port of the first filter 6-1 is connected with a lower output port of the cyclone group 4 through a pipeline, and an output port of the first filter 6-1 is connected with the circulating water tank 1 through a pipeline; an input port of the second filter 6-2 is connected with an output port of the hydrodynamic cavitator group 5 through a pipeline; an input port of the ultraviolet lamp tube 8 is connected with an output port of the second filter 6-2 through a pipeline; and the output port of the ultraviolet lamp tube 8 is connected with the circulating water tank 1.

Description

Technical Field

[0001] This application relates to the technical field of physical and chemical water treatment, and particularly to a physical and chemical treatment device for circulating cooling water in a power plant. Background Art

[0002] Practice has proved that after the implementation of industrial circulating water treatment technology, a large amount of industrial water is saved, water fees and sewage charges are correspondingly reduced. More importantly, equipment corrosion and scaling are slowed down, the service life of the equipment is extended, and the long-term stable operation of the system is guaranteed. Among them, the water quality of circulating cooling water can directly affect the safe operation of heat exchange devices and their pipelines. Pipeline corrosion, scaling, and slime are the main reasons for the damage and efficiency reduction of heat exchange equipment, and lead to a significant increase in the makeup water volume of circulating water. At present, the treatment of circulating cooling water at home and abroad mainly relies on the addition of chemicals such as corrosion inhibitors, scale inhibitors, and bactericides to avoid scaling and corrosion of heat exchange tubes in the system. However, the addition of chemicals requires skilled workers, it is difficult to achieve accurate dosages, and continuous addition is required, resulting in an accelerated increase in the concentration ratio during the operation of circulating water, shortening the water change cycle of the circulating water tank, and increasing the water consumption of the circulating water system. Frequent addition of chemicals also has problems such as aggravating corrosion, depositing and blocking equipment pipelines, shortening the service life of equipment, and having limited effect on diluting and disintegrating existing water scales. The use of bactericides will also cause some microorganisms to develop drug resistance, affecting the use effect, and the water quality is likely to fail to meet the standards. In addition, many chemicals, such as sodium hypochlorite, are toxic, irritating, and volatile, and are prone to cause secondary pollution to the environment and affect the health of workers.

[0003] Hydrodynamic cavitation is a cutting-edge non-chemical water treatment technology. The main mechanism is that at a constant temperature, when the local pressure at a certain point in the liquid drops to a certain pressure value (saturation vapor pressure) or even negative pressure, many visible tiny bubbles are generated at that point. When these tiny bubbles enter the positive pressure area with the fluid, they will be rapidly compressed until they collapse due to the increase in the surrounding pressure. At the moment of collapse, the tiny bubbles will generate extremely high temperature and pressure within an extremely small range around them, which has important physical and chemical effects. It can destroy organic impurities such as viruses and bacteria without residues, avoid or reduce the use of chemical treatment agents (bactericides, scale inhibitors, and corrosion inhibitors), and significantly improve the water quality in a sustainable manner.

[0004] At present, the application of hydrodynamic cavitation sterilization and scale removal technology in the circulating cooling water of power plants is less. The characteristics of the circulating cooling water in power plants are large water volume, high concentration ratio, and seasonality. During the peak electricity consumption period in summer, the temperature of the circulating water can reach above 40°C, and the microbial reproduction rate accelerates. Therefore, a technology that can not only meet the long-term low-power sterilization and scale removal requirements but also control microbial and concentration ratio indicators under extreme conditions is needed.

[0005] In the currently disclosed technologies, basically only the combination of simple cavitation and ultraviolet technologies is used, and the effect is limited. It is difficult to meet the requirements of large-scale power plant circulating cooling water sterilization and disinfection, and the problem of integrating sterilization, algaecide, disinfection, and scale removal is rarely considered. In fact, the currently disclosed technologies for cavitation sterilization rarely consider the problem of integrated scale removal. During the cavitation operation process, due to the relatively low pressure at the cavitation occurrence location, according to Henry's law, the solubility of calcium and magnesium ions decreases, and solid-phase particles such as calcite are easily precipitated. The advantage is that the concentration ratio of the circulating cooling water is reduced and the water consumption is decreased. The disadvantage is that the particulate matter will deposit or further dissolve into the water body. Therefore, separation equipment needs to be introduced to timely remove scale. In addition, the operation of electrolysis equipment and other equipment will also generate certain solid-phase particulate matter entering the water tank, and the circulating water tank itself will also have a certain amount of solid-phase particulate matter accumulated for a long time. These are all impurities that need to be specifically removed. Summary of the Invention

[0006] The purpose of the present invention is to design and develop a combined method and equipment that combines hydrocyclone, cavitation, ozone, ultraviolet light, and electrolysis for the characteristics of large quantity, high concentration ratio, and seasonality of power plant circulating cooling water. It can automatically adjust and switch according to monitoring data, meet the requirements of long-term low-power sterilization and scale removal, and can stably control the microbial and concentration ratio indicators under extreme conditions.

[0007] To achieve the above purpose, the embodiments of the present application provide a physical and chemical treatment device for power plant circulating cooling water, and the device includes:

[0008] A circulating water tank (1) with circulating cooling water therein;

[0009] A hydrocyclone group (4) whose input port is connected to the circulating water tank (1) through a pipeline. A circulating water pump (2) is arranged between the circulating water tank (1) and the hydrocyclone group (4), and the circulating water pump (2) is used to pump the circulating cooling water into the hydrocyclone group (4);

[0010] A hydraulic cavitator group (5) is arranged above the hydrocyclone group (4), and its input port is connected to the upper output port of the hydrocyclone group (4) through a pipeline;

[0011] A first filter (6-1) is arranged below the hydrocyclone group (4). The input port of the first filter (6-1) is connected to the lower output port of the hydrocyclone group (4) through a pipeline, and the output port of the first filter (6-1) is connected to the circulating water tank (1) through a pipeline;

[0012] A second filter (6-2) whose input port is connected to the output port of the hydraulic cavitator group (5) through a pipeline;

[0013] The ultraviolet lamp tube (8) has its input port connected to the output port of the second filter (6-2) through a pipeline;

[0014] The output port of the ultraviolet lamp tube (8) is connected to the circulation water tank (1).

[0015] In a possible implementation manner, a valve is provided in the pipeline between the cyclone group (4) and the hydrodynamic cavitator group (5).

[0016] In a possible implementation manner, a valve is provided in the pipeline between the cyclone group (4) and the first filter (6-1).

[0017] In a possible implementation manner, an ozone generator (7) is further included. The outlet of the ozone generator (7) should be placed above the circulation water tank (1) and connected to the cavitator group (5), and a check valve (3-2) should be provided between the ozone generator (7) and the cavitator group (5) to prevent backflow when the gas source is closed.

[0018] In a possible implementation manner, an electrolytic cell (9) is further included, which is arranged between the second filter (6-2) and the circulation water tank (1);

[0019] A pipeline with two-way connection is provided between the electrolytic cell (9) and the ultraviolet lamp tube (8), and a valve is provided on the pipeline.

[0020] In a possible implementation manner, a water quality detector (10) is further included, which is arranged between the first filter (6-1) and the circulation water tank (1).

[0021] In a possible implementation manner, the first filter and the second filter (6-2) are backwash filters with a filtration accuracy below 1 micron.

[0022] In a possible implementation manner, the cyclone group (4) includes one or more cyclones arranged in parallel; the cavitator group (5) includes one or more cavitators arranged in parallel; an adjustment valve is provided at the outlet of each cyclone, and the split ratio is controlled by adjusting the cyclone, and the gas-liquid ratio is adjusted by adjusting the air inlet valve of the cavitator to strengthen the cavitation effect.

[0023] On the other hand, the present application also provides a physical and chemical treatment method for power plant circulating cooling water based on the aforementioned device. The method includes:

[0024] A bypass is set in the circulating water tank 1. The circulating cooling water is pumped into the hydrocyclone group (4) by the circulating water pump 2. After the centrifugal force field of the hydrocyclone causes certain physical damage to the microorganisms, most of the circulating water passing through the hydrocyclone group (4) is discharged from the overflow port at the upper part of the hydrocyclone group (4) and enters the hydrodynamic cavitator group (5). The physical and chemical effects generated by cavitation cause mechanical damage to microorganisms such as algae and bacteria, reduce their activity, and break up the accumulation of microorganisms such as algae, bacteria, and viruses, making them fully exposed; the remaining circulating water is discharged from the underflow port of the hydrocyclone group (4). The centrifugal field generated by the hydrocyclone discharges particulate matters such as water scale from the circulating water body. After being intercepted by the first filter (6-1), the particulate matters are cleaned regularly, and the circulating water returns to the circulating water tank (1);

[0025] The circulating water enters the second filter (6-2) to filter out solid-phase particulate matters such as carbonates precipitated by the cavitation negative pressure. While reducing the concentration ratio, it avoids the increase in the turbidity of the circulating water from affecting the working efficiency of the subsequent ultraviolet lamp tube (8);

[0026] After the circulating water is irradiated by the ultraviolet lamp tube (8), a large number of microorganisms die, meeting the requirements for the control of microorganisms in the circulating cooling water of the power plant.

[0027] In a possible implementation, during the period when the water temperature > 30°C and the concentration ratio is higher than the threshold, an ozone generator (7) is added in front of the hydrodynamic cavitator group (5), and the generated ozone is accelerated in dissolution under the cavitation effect; or,

[0028] An electrolytic cell (9) is added behind the hydrodynamic cavitator group (5). The electrolysis efficiency is enhanced under the cavitation effect, and bactericidal products are generated by the reaction to quickly kill microorganisms.

[0029] This application comprehensively treats the problems of microorganisms and water scale in the circulating cooling water through the organic combination of cyclone, cavitation, ozone, ultraviolet light, and electrolysis. After applying this system, the content of naturally combined oxygen in the water increases sharply, and the biofilm in the water body dissolves in the pipe network, preventing new scale formation, reducing the chemical agent costs of bactericides and scale inhibitors. The circulating cooling water system saves more than 10% of energy comprehensively. Thus, it achieves the improvement of the circulating water quality, reduction of the circulating water make-up volume and the discharged volume of concentrated wastewater; reduction or avoidance of the secondary pollution of the water environment by existing conventional chemical agents such as circulating water bactericides, stabilizers, and scale inhibitors; effective treatment of common problems such as microorganism breeding, pipe wall scaling, and corrosion in the circulating cooling water system; improvement of the heat exchange efficiency of the condenser, and assistance in the safe, stable, and long-term operation of power production. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of a physical and chemical treatment device for power plant circulating cooling water provided by an exemplary embodiment of the present application;

[0032] Figure 2 It is a schematic diagram of a physical and chemical treatment device for power plant circulating cooling water provided by an exemplary embodiment of the present application;

[0033] Figure 3 It is a schematic diagram of a physical and chemical treatment device for power plant circulating cooling water provided by an exemplary embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of a physical and chemical treatment device for power plant circulating cooling water provided by an exemplary embodiment of the present application;

[0035] Figure 5 It is the sterilization efficiency curve of the cavitation-ultraviolet combined treatment provided for an exemplary embodiment. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0037] The following will specifically describe the present invention with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0038] Please refer to Figures 1 to 4, which is a schematic diagram of a physical and chemical treatment device for circulating cooling water in a power plant provided by an exemplary embodiment of the present application. The device includes: a circulation pool 1 in which there is circulating cooling water; a hydrocyclone group 4, the input port of which is connected to the circulation pool 1 through a pipeline. A circulation water pump 2 is arranged between the circulation pool 1 and the hydrocyclone group 4. The circulation water pump 2 is used to pump the circulating cooling water into the hydrocyclone group 4, and a regulating valve 3-1 is installed at the inlet of the hydrocyclone group 4; a hydrodynamic cavitator group 5 is arranged above the hydrocyclone group 4, and the input port is connected to the upper output port of the hydrocyclone group 4 through a pipeline; a first filter 6-1 is arranged below the hydrocyclone group 4. The input port of the first filter 6-1 is connected to the lower output port of the hydrocyclone group 4 through a pipeline, and the output port of the first filter 6-1 is connected to the circulation pool 1 through a pipeline; a second filter 6-2, the input port of which is connected to the output port of the hydrodynamic cavitator group 5 through a pipeline; an ultraviolet lamp tube 8, the input port of which is connected to the output port of the second filter 6-2 through a pipeline; the output port of the ultraviolet lamp tube 8 is connected to the circulation pool 1.

[0039] According to different treatment volumes, the hydrocyclone group 4 is composed of one or more hydrocyclones sharing the inlet, overflow port and underflow port in parallel respectively. The cavitator group 5 is composed of one or more cavitators sharing the liquid phase inlet, gas phase inlet and gas-liquid mixture outlet in parallel respectively. The parallel connection adopts a direct discharge type or a lotus type arrangement. A regulating valve is arranged at the outlet of each hydrocyclone. The split ratio is controlled by adjusting the hydrocyclones 3-9, 3-10, 3-11, 3-12, 3-13, 3-14, and the gas-liquid ratio is adjusted by adjusting the air inlet valve 3-2 of the cavitator to strengthen the cavitation effect. It is necessary to strictly ensure that the pressure losses between the inlets and outlets of each hydrocyclone and cavitator and the common inlets and outlets are consistent respectively.

[0040] Furthermore, in a preferred embodiment, an ozone generator 7 is further included. The outlet of the ozone generator 7 should be placed above the circulation pool 1. An ozone inlet is arranged at the throat of the cavitator group 5 and is connected to the ozone outlet of the ozone generator 7. A check valve 3-2 should be arranged between the ozone generator 7 and the cavitator group 5 to prevent backflow when the gas source is closed. According to different microbial indexes of the circulating water, the ozone generator can be an oxygen source or an air source. Oxygen cylinders or PSA oxygen generators can be selected to provide oxygen, or air can be directly inhaled.

[0041] Furthermore, in a preferred embodiment, an electrolytic cell 9 is further included, which is arranged between the second filter 6-2 and the circulation pool 1. The electrolytic cell 9 uses a DSA anode (insoluble anode) for electrolysis. The water scale will adhere to the surface of the negative electrode plate in the electrolytic cell, and then the polarities of the positive electrode and the negative electrode are switched regularly. After switching, the water scale attached to the negative electrode falls off and is collected centrally.

[0042] Further, in a preferred embodiment, a water quality detector 10 is further included, which is disposed between the first filter 6-1 and the circulation water tank 1. According to the sampled data of the water quality in the circulation water tank monitored by the water quality detector 10, through the automatic analysis of a series of indicators such as pH, temperature, conductivity, ammonia nitrogen, COD, chloride ions, turbidity, etc., the opening and closing of valves 3-2, 3-3, 3-4, 3-5, 3-6, 3-7, 3-8 are judged to complete.

[0043] Exemplarily, the first filter and the second filter 6-2 are backwash filters with a filtration accuracy of less than 1 micron.

[0044] On the other hand, the present application also provides a physical and chemical treatment method for power plant circulating cooling water based on the above device, and the method includes:

[0045] (a) A bypass is set in the circulation water tank 1, and the circulating cooling water is pumped into the hydrocyclone group 4 through the circulating water pump 2. After the centrifugal force field of the hydrocyclone causes certain physical damage to the microorganisms, most of the circulating water passing through the hydrocyclone group 4 is discharged from its overflow port and enters the hydrodynamic cavitator group 5. The physical and chemical effects generated by cavitation cause mechanical damage to microorganisms such as viruses and bacteria, reduce their activity, and break up the accumulation of microorganisms such as algae, bacteria, and viruses, making them fully exposed;

[0046] (b) The circulating water enters the second filter 6-2 to filter out solid-phase particles such as carbonates precipitated by cavitation negative pressure. While reducing the concentration ratio, it avoids the increase in the turbidity of the circulating water from affecting the subsequent ultraviolet light sterilization efficiency;

[0047] (c) After the circulating water is irradiated by the ultraviolet lamp tube 8, a large number of microorganisms die, meeting the requirements for the control of microorganisms in the power plant circulating cooling water;

[0048] (d) For the summer with a higher water temperature (>30°C) and the period with a higher concentration ratio, the microbial reproduction rate is higher. An ozone generator 7 can be added in front of the hydrodynamic cavitator group 5. The generated ozone is accelerated to dissolve under the cavitation effect and further reacts to form hydroxyl radicals. The ozone, hydroxyl radicals, and intermediate products such as hydrogen peroxide act synergistically to quickly kill microorganisms, and due to different killing mechanisms, the inactivation of microorganisms is more thorough under the synergistic effect; and,

[0049] (e) For the summer with a higher water temperature (>30°C) and the period with a higher concentration ratio, the microbial reproduction rate is higher. An electrolytic cell 9 can be added behind the hydrodynamic cavitator group 5. The electrolysis efficiency is enhanced under the cavitation effect, and bactericidal products such as sodium hypochlorite, hydroxyl radicals, and hydrogen peroxide are generated and act synergistically to quickly kill microorganisms. Due to different killing mechanisms, the inactivation of microorganisms is more thorough under the synergistic effect, where the concentration ratio can be a preset threshold, and when it exceeds the threshold, the concentration ratio is considered to be in a higher state;

[0050] (f) The centrifugal force of the swirling flow and the negative pressure generated by cavitation can cause calcium and magnesium ions in the water to precipitate, forming solid-phase particulate matters such as carbonates, which are removed by the second filter 6-2 provided at the rear end of the cavitator group 5. When the concentration ratio (conductivity) of the circulating water is relatively high, the electrolytic cell 9 is turned on to precipitate the remaining ions in the electrolytic cell 9 and clean them regularly, achieving the purpose of scale removal by non-chemical methods;

[0051] (g) The ultraviolet lamp tube 8, the ozone generator 7 and the electrolytic cell 9 can be used synchronously and synergistically, or can be used separately. The function switching is completed by automatically analyzing a series of indicators such as pH, temperature, conductivity, ammonia nitrogen, COD, chloride ions, and turbidity based on the circulating water quality sampling data monitored by the water quality detector 10, and judging the opening and closing of the valves 3-2, 3-3, 3-4, 3-5, 3-6, 3-7, 3-8; the valve 3-15 is used to close the water tank to facilitate the installation and maintenance of the detector;

[0052] In a preferred embodiment, when the temperature is not higher than 30°C, through the combined application of the cavitator group 5 and the ultraviolet lamp tube 8, the sterilization rate of the effluent can reach more than 99%.

[0053] In another preferred embodiment, through the combined application of the cavitator group 5 and the ozone generator 7, the sterilization rate of the effluent can reach 100%.

[0054] In another preferred embodiment, through the combined application of the cavitator group 5 and the electrolytic cell 9, the sterilization rate of the effluent can reach 100%.

[0055] In another preferred embodiment, through the combined application of the cavitator group 5, the ozone generator 7, the ultraviolet lamp tube 8 and the electrolytic cell 9, the sterilization rate of the effluent can reach 100%, and the circulating flow rate can be greatly reduced.

[0056] See Figure 5 . Figure 5 The sterilization efficiency curve provided for an exemplary embodiment of the cavitation-ultraviolet combination treatment.

[0057] According to the method of the present invention, for the problem of sterilization and algae removal of power plant circulating cooling water, by combining the physical methods of cavitation and ultraviolet, the circulating cooling water containing microorganisms in the experimental pool is directly taken from a certain power plant cooling tower, and the volume of the circulating water is 60m 3 , and the initial colony concentration of the water sample is about 390000 CFU / ml, and other indicators are shown in the following table.

[0058] pH value 8.45 Conductivity 4574 μs / cm Ammonia nitrogen 2.41 mg / L COD 82.58 mg / L Temperature 32℃ Chloride ion 569.41 mg / L Dissolved oxygen 2.81 mg / L Turbidity 0.01 NTU

[0059] Implementation process:

[0060] The number of colonies in the circulating water is 390000 CFU / ml, far exceeding 105 According to the industrial standard of power plant circulating water, pretreatment is first carried out through the hydraulic cavitator group 5. While damaging and killing a part of the fungi, the accumulated bacteria are dispersed, making the ultraviolet light irradiation more sufficient. The effluent flows back to the circulating water tank. As a reference, this paper comparatively studied the influence of three groups of different inlet pressures on the bactericidal effect of colonies, as well as the bactericidal effects of single UV and UV cavitation combinations. Experiments have proved that under the pure cavitation condition, increasing the inlet pressure within a certain range can significantly improve the removal efficiency of colonies, and the bactericidal effect of the UV cavitation combination (ultraviolet lamp 8 and cavitator group 5) is the strongest, and the bactericidal rate can reach more than 99%.

[0061] The above description is only some preferred embodiments of the present disclosure and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the embodiments of the present disclosure.

[0062] After considering the specification and practicing the utility model disclosed herein, those skilled in the art will readily think of other embodiments of the present application. The present application aims to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application.

[0063] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

[0064] It should be understood that the term "plurality" mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0065] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A physical and chemical treatment device for circulating cooling water in a power plant, characterized in that: The device comprises: A circulating water pool (1), wherein circulating cooling water is present; A cyclone group (4), the input port of which is connected to the circulating water pool (1) through a pipeline, a circulating water pump (2) is provided between the circulating water pool (1) and the cyclone group (4), and the circulating water pump (2) is used to draw circulating cooling water into the cyclone group (4); A hydrodynamic cavitation group (5) is arranged above the cyclone group (4), and an input port is connected to an upper output port of the cyclone group (4) through a pipeline; A first filter (6-1) is arranged below the cyclone group (4), the input port of the first filter (6-1) is connected to the lower output port of the cyclone group (4) through a pipeline, and the output port of the first filter (6-1) is connected to the circulating water pool (1) through a pipeline; A second filter (6-2), the input port of which is connected to the output port of the hydrodynamic cavitation device group (5) through a pipeline; An ultraviolet lamp (8), the input port of which is connected to the output port of the second filter (6-2) via a pipeline; The output port of the ultraviolet lamp tube (8) is connected to the circulating water pool (1).

2. The device according to claim 1, characterized in that The pipeline between the cyclone group (4) and the hydrodynamic cavitation group (5) is provided with a valve.

3. The device according to claim 1, characterized in that The pipeline between the cyclone group (4) and the first filter (6-1) is provided with a valve.

4. The device according to any one of claims 1 to 3, characterized in that It also includes an ozone generator (7), the outlet of which should be placed above the circulating water pool (1) and connected to the cavitation group (5), and a check valve (3-2) should be provided between the ozone generator (7) and the cavitation group (5) to prevent backflow when the gas source is closed.

5. The device according to any one of claims 1 to 3, characterized in that: It also includes an electrolytic cell (9) disposed between the second filter (6-2) and the circulating water pool (1); A bidirectionally connected pipeline is provided between the electrolytic cell (9) and the ultraviolet lamp tube (8), and a valve is provided on the pipeline.

6. The device according to any one of claims 1 to 3, characterized in that It also includes a water quality detector (10) which is arranged between the first filter (6-1) and the circulating water pool (1).

7. The device according to any one of claims 1 to 3, characterized in that: The first filter and the second filter (6-2) are backwash filters with a filtration accuracy of less than 1 micron.

8. The device according to any one of claims 1 to 3, characterized in that The cyclone group (4) includes one or more cyclones arranged in parallel; the cavitator group (5) includes one or more cavitators arranged in parallel; a regulating valve is arranged at the outlet of each cyclone, the flow splitting ratio is controlled by regulating the cyclone, and the gas-liquid ratio is adjusted by regulating the air inlet valve of the cavitator to enhance the cavitation effect.

9. A physical and chemical treatment device for circulating cooling water in a power plant, characterized in that: The device comprises: A circulating water pool (1), wherein circulating cooling water is present; A cyclone group (4), the input port of which is connected to the circulating water pool (1) via a pipeline, and a circulating water pump (2) is provided between the circulating water pool (1) and the cyclone group (4); A hydrodynamic cavitation group (5), the input port of which is connected to the upper output port of the cyclone group (4) through a pipeline; A first filter (6-1), the input port of which is connected to the lower output port of the cyclone group (4) through a pipeline, and the output port of which is connected to the circulating water pool (1); A second filter (6-2), the input port of which is connected to the output port of the hydrodynamic cavitation device group (5) through a pipeline; The ozone generator (7) has its outlet connected to the hydrodynamic cavitation device group (5) via a check valve (3-2), and the output port of the second filter (6-2) is directly connected to the circulating water pool (1).

10. A physical and chemical treatment device for circulating cooling water in a power plant, characterized in that: The device comprises: A circulating water pool (1), wherein circulating cooling water is present; A cyclone group (4), the input port of which is connected to the circulating water pool (1) via a pipeline, and a circulating water pump (2) is provided between the circulating water pool (1) and the cyclone group (4); A hydrodynamic cavitation group (5), the input port of which is connected to the upper output port of the cyclone group (4) through a pipeline; A first filter (6-1), the input port of which is connected to the lower output port of the cyclone group (4) through a pipeline, and the output port of which is connected to the circulating water pool (1); A second filter (6-2), the input port of which is connected to the output port of the hydrodynamic cavitation device group (5) through a pipeline; The electrolytic cell (9) is arranged between the second filter (6-2) and the circulating water pool (1), and a valve (3-3) is arranged on the pipeline between the electrolytic cell (9) and the circulating water pool (1).

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