Micro-nano ozone bubble reinforced on-line cleaning and sterilizing device and micro-nano ozone bubble reinforced on-line cleaning and sterilizing method

Abstract

The invention discloses a micro-nano ozone bubble reinforced on-line cleaning and sterilizing device and method. The on-line cleaning and sterilizing device comprises a water tank; the heat exchanger is connected to the water tank; the circulating pump is arranged between the water tank and the heat exchanger; an inlet of the micro-nano ozone bubble generator is connected to the pipeline between the circulating pump and the heat exchanger, and an outlet of the micro-nano ozone bubble generator is connected to the pipeline between the circulating pump and the water tank; the ozone machine is connected with the micro-nano ozone bubble generator; the inlet of the user system is connected to one end of the heat exchanger away from the circulating pump, and the outlet is connected to the inlet of the circulating pump; the filter is arranged in parallel with the user system; the connecting pipeline is connected with the water tank, the circulating pump, the heat exchanger, the user system and the circulating pump in sequence. According to the online cleaning and disinfecting device and method, the cooling water system can be continuously cleaned and disinfected on line on the premise that normal operation of the cooling water system is not affected.

Description

Technical Field

[0001] The invention relates to the field of cleaning industry, and in particular to an online cleaning and sterilization device and method enhanced by micro-nano ozone bubbles. Background Art

[0002] Closed-loop cooling water systems are used to transfer heat from equipment to ensure that the temperature of the equipment is always within the appropriate working range. They are widely used in nuclear power plants, semiconductor manufacturing, food processing, and medical and pharmaceutical industries. Among them, closed-loop cooling water systems have the characteristics of many user devices and long pipeline distances. The connecting pipes in the system need to be cleaned and disinfected regularly to ensure the internal cleanliness of the cooling water system, thereby ensuring the safety of production equipment and the quality and hygiene of products.

[0003] At present, the cleaning and disinfection process of the cooling water system requires the cooling water system and its downstream user equipment to be shut down. Not only does the shutdown take a long time, but the secondary treatment of residual chemicals is complicated. There are also problems such as uneven cleaning, incomplete disinfection and high safety risks. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide an online cleaning and disinfection device and method enhanced by micro-nano ozone bubbles, which can continuously clean and disinfect the cooling water system online without affecting the normal operation of the cooling water system, thereby improving the cleaning and disinfection effects and reducing the safety risks of the cleaning process.

[0005] To solve the above technical problems, the present invention is implemented through the following technical solutions.

[0006] The present invention provides an online cleaning and disinfection device enhanced by micro-nano ozone bubbles, which at least comprises:

[0007] Water tank;

[0008] a heat exchanger connected to the water tank;

[0009] A circulation pump, arranged between the water tank and the heat exchanger;

[0010] A micro-nano ozone bubble generator, the inlet of which is connected to the pipeline between the circulation pump and the heat exchanger, and the outlet of which is connected to the pipeline between the circulation pump and the water tank;

[0011] An ozone generator, connected to the micro-nano ozone bubble generator;

[0012] at least one user system, with an inlet connected to an end of the heat exchanger away from the circulation pump, and an outlet connected to the inlet of the circulation pump;

[0013] a filter arranged in parallel with the user system; and

[0014] A connecting pipeline sequentially connects the water tank, the circulating pump, the heat exchanger, the user system and the circulating pump.

[0015] In one embodiment of the present invention, the micro-nano ozone bubble generator includes an inlet pipe, a contraction tube, a throat, a diffusion tube and an outlet pipe connected in sequence, the inlet of the inlet pipe is connected to one end of the circulation pump close to the heat exchanger, and the outlet of the outlet pipe is connected to one end of the circulation pump close to the water tank.

[0016] In one embodiment of the present invention, the diameter ratio of the inlet pipe and the outlet pipe to the throat pipe is (3-4):1, the ratio of the length and diameter of the throat pipe is (2-3):1, the contraction angle of the contraction tube is 21°-27°, and the diffusion angle of the diffusion tube is 9°-13°.

[0017] In one embodiment of the present invention, the micro-nano ozone bubble generator further includes at least one air inlet channel, and the air inlet channel is arranged on the throat pipe and communicated with the interior of the throat pipe.

[0018] In one embodiment of the present invention, the cleaning and disinfection device further includes a detector, which is disposed on the connecting pipe on the outlet side of the heat exchanger, and the filter and the user system are located on a downstream branch of the detector.

[0019] In one embodiment of the present invention, the cleaning and disinfection device further includes a flow regulating valve, and the flow regulating valve is arranged on the branch pipe where the filter is located.

[0020] In one embodiment of the present invention, the cleaning and disinfection device further includes a drain valve, and the drain valve is arranged on the user system.

[0021] In one embodiment of the present invention, each of the flow regulating valves is communicatively connected to the detector.

[0022] The present invention also provides an online cleaning and disinfection method enhanced by micro-nano ozone bubbles, which uses the above-mentioned cleaning and disinfection device and at least includes the following steps:

[0023] During the normal operation of the cooling water system, the return water from the user system enters the heat exchanger through the circulation pump and is cooled before being sent to the user system;

[0024] Starting the ozone generator and the micro-nano ozone bubble generator, the micro-nano ozone bubble generator receives the ozone gas generated by the ozone generator and the cooling water at the outlet of the circulation pump, and outputs a mixture of ozone bubbles and cooling water to the connecting pipe;

[0025] The mixture strips away contaminants attached to the connecting pipe; and

[0026] The filter is activated to filter out the contaminants.

[0027] In one embodiment of the present invention, in the mixture, the concentration of ozone in the cooling water is 0.1 mg / L-100 mg / L, and the average particle size of the ozone bubbles is 0.1 μm-50 μm.

[0028] In summary, the present invention provides an online cleaning and sterilization device and method enhanced by micro-nano ozone bubbles, which can continuously clean, sterilize and sterilize the connecting pipes of the cooling water system online without affecting the cooling water system and the user system. Moreover, the cleaning and sterilization device and method provided by the present invention can effectively kill various types of bacteria, viruses, fungi and microorganisms, and can also decompose organic pollutants, remove odors, and peel off dirt, sediments, biofilms and other impurities on the connecting pipes, so that the cleaning and sterilization effect is more thorough. It can avoid the use of hazardous chemicals throughout the process, and has broad application prospects in many fields such as drinking water pipes and industrial water pipes. It can reduce energy consumption, reduce the amount of chemicals used and damage to the base material of the connecting pipes, and significantly improve the sanitary condition, flow performance and service life of the connecting pipes.

[0029] Of course, any method of implementing the present invention does not necessarily need to achieve all of the advantages mentioned above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of an online cleaning and disinfection device in one embodiment of the present invention.

[0032] Figure 2 for Figure 1 Schematic diagram of the micro-nano ozone bubble generator.

[0033] Description of labels:

[0034] 11. Water tank; 111. Drain pipe; 112. Water supply pipe; 113. Exhaust pipe; 12. Heat exchanger; 13. Circulation pump; 14. Micro-nano ozone bubble generator; 141. Inlet pipe; 142. Contraction tube; 143. Throat; 144. Diffuser; 145. Outlet pipe; 146. Multi-stage annular steps; 147. Air inlet channel; 15. Ozone generator; 16. User system; 17. Filter; 18. Connecting pipe; 19. Flow control valve; 20. Detector; 21. Drain valve. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0037] The technical scheme of the present invention is further described in detail below in conjunction with the embodiments and 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 making creative work belong to the scope of protection of the present invention.

[0038] See also Figure 1 to Figure 2As shown, the present invention provides an online cleaning and disinfection device enhanced by micro-nano ozone bubbles, which at least includes a water tank 11, a heat exchanger 12, a circulating pump 13, a micro-nano ozone bubble generator 14, an ozone machine 15, a user system 16, a filter 17 and a connecting pipe 18, etc., wherein the heat exchanger 12 is connected to the water tank 11, the circulating pump 13 is arranged between the heat exchanger 12 and the water tank 11, the inlet of the micro-nano ozone bubble generator 14 is connected to the pipe between the circulating pump 13 and the heat exchanger 12, and the outlet is connected to the inlet of the circulating pump 13, the ozone machine 15 is connected to the micro-nano ozone bubble generator 14, the inlet of the user system 16 is connected to the end of the heat exchanger 12 downstream away from the circulating pump 13, and the outlet is gathered back to the inlet of the circulating pump 13, the filter 17 and the user system 16 are arranged in parallel, and the connecting pipe 18 connects the water tank 11, the circulating pump 13, the heat exchanger 12, the user system 16 and the circulating pump 13 in sequence. In the cleaning and disinfection device provided by the present invention, based on the Venturi cavitation effect, the micro-nano ozone bubble generator 14 inhales the ozone gas output by the ozone machine 15 at the variable diameter throat, and continuously generates micro-nano ozone bubbles along the multi-step diffusion section, continuously flushing and cleaning the connecting pipe 18, removing the biofilm and pollutants on the surface of the connecting pipe 18, killing pathogenic microorganisms and bacterial spores, and spontaneously forming a passivation film on the inner wall of the connecting pipe 18 to prevent the growth of microorganisms, thereby achieving the purpose of cleaning and disinfection.

[0039] See also Figure 1 As shown, in one embodiment of the present invention, the water tank 11 provides a clean water source for the cooling water system. The water tank 11 is, for example, a high-level water tank, so that the water in the water tank 11 can flow smoothly into the inlet of the subsequent circulating pump 13 by its own gravity, providing a static pressure head and an emergency water source.

[0040] See also Figure 1 As shown, in one embodiment of the present invention, a sewage pipe 111 is provided on the water tank 11. The sewage pipe 111 is, for example, provided at the bottom of the water tank 11. By providing the sewage pipe 111, pollutants in the water tank 11 can be discharged regularly to achieve the purpose of cleaning the water tank 11.

[0041] See also Figure 1 As shown, in one embodiment of the present invention, a water supply pipe 112 is further provided on the water tank 11, and the water supply pipe 112 is, for example, provided at the top of the water tank 11. By providing the water supply pipe 112, water can be replenished into the water tank 11 in time, so as to avoid the normal operation of the cooling water system being affected by the lack of water in the water tank 11.

[0042] See also Figure 1As shown, in one embodiment of the present invention, the water tank 11 is further provided with an exhaust pipe 113, and the exhaust pipe 113 and the water supply pipe 112 are arranged at intervals on the top of the water tank 11. While water is supplied to the water tank 11 through the water supply pipe 112, the exhaust pipe 113 is opened to discharge the gas in the water tank 11 in time, so as to avoid excessive pressure in the water tank 11 and achieve the purpose of protecting the water tank 11.

[0043] See also Figure 1 As shown, in one embodiment of the present invention, the heat exchanger 12 is connected to the water tank 11. Specifically, the return water of the user system 16 enters the heat exchanger 12 through the circulation pump 13 and is cooled, and then sent to the user system 16 as a cooling medium. When the downstream of the heat exchanger 12 leaks, the water in the water tank 11 automatically replenishes water to maintain the operation of the system. The heat exchanger 12 is, for example, a direct contact heat exchanger, an energy storage heat exchanger, or a partition heat exchanger, etc., which can be selected according to actual needs.

[0044] See also Figure 1 As shown, in one embodiment of the present invention, a circulation pump 13 is disposed between the water tank 11 and the heat exchanger 12 to pressurize the water flowing out of the water tank 11, so that the water can smoothly flow into the heat exchanger 12. The circulation pump 13 is, for example, a centrifugal pump, an axial flow pump or a diaphragm pump, etc., which can be selected according to actual needs.

[0045] See also Figure 1 As shown, in one embodiment of the present invention, the inlet of the user system 16 is connected to the end of the heat exchanger 12 away from the circulating pump 13, and the outlet is connected to the connecting pipe 18 between the circulating pump 13 and the water tank 11. Among them, the user system 16 is, for example, at least one, and when the user system 16 is, for example, multiple, the multiple user systems 16 are, for example, arranged in parallel. Specifically, after the heat exchanger 12 cools the water, the cooling water is sent to the user system 16 as a cooling medium to cool the various devices in the user system 16, and the cooling water itself absorbs heat in the user system 16, and then continues to be sent to the heat exchanger 12 through the circulating pump 13 to be cooled. After obtaining the cooling water, it continues to be sent to the user system 16, and the cycle is repeated, and the cooling water circulates in the circulating pump 13, the heat exchanger 12 and the user system 16. In this embodiment, the user system 16 is, for example, five, and the five user systems 16 are, for example, a motor cooler, an air cooler, a hydrogen cooler, an oil cooler and a shaft seal water system.

[0046] See also Figure 1 As shown, in one embodiment of the present invention, the circulating pump 13, the heat exchanger 12 and the user system 16 constitute a cooling water system, and the cooling water circulates in the cooling water system to achieve the purpose of cooling down each device in the user system 16.

[0047] See also Figure 1As shown, in one embodiment of the present invention, the connecting pipe 18 sequentially connects the water tank 11, the circulating pump 13, the heat exchanger 12, the user system 16 and the circulating pump 13. The material of the connecting pipe 18 and the user system 16 includes at least one of metals such as carbon steel, stainless steel and copper.

[0048] See also Figure 1 As shown, in one embodiment of the present invention, the circulating pump 13, the heat exchanger 12, the user system 16 and the connecting pipes 18 therebetween constitute a cooling water system, and the cooling water circulates in the cooling water system to achieve the purpose of cooling down the various devices in the user system 16. However, since the cooling water circulates in the cooling water system for a long time, a large amount of pollutants must be accumulated in the connecting pipes 18, so the connecting pipes 18 must be cleaned and disinfected to prevent the pollutants from spreading to the user system 16 and affecting the safety and sanitation of the user system 16.

[0049] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, the inlet of the micro-nano ozone bubble generator 14 is connected to one end of the circulation pump 13 close to the heat exchanger 12, and the outlet is connected to one end of the circulation pump 13 close to the water tank 11. Specifically, the micro-nano ozone bubble generator 14 includes, for example, an inlet pipe 141, a contraction tube 142, a throat 143, a diffusion tube 144, and an outlet pipe 145, which are connected in sequence. Among them, the inlet of the inlet pipe 141 is connected to one end of the circulation pump 13 close to the heat exchanger 12, the outlet of the inlet pipe 141 is connected to the inlet of the contraction tube 142, the outlet of the contraction tube 142 is connected to the inlet of the throat 143, the outlet of the throat 143 is connected to the inlet of the diffusion tube 144, the outlet of the diffusion tube 144 is connected to the inlet of the outlet pipe 145, and the outlet of the outlet pipe 145 is connected to one end of the circulation pump 13 close to the water tank 11.

[0050] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, in the direction from the inlet pipe 141 to the outlet pipe 145, the sizes of the inlet pipe 141, the throat pipe 143 and the outlet pipe 145 remain constant, the size of the outlet pipe 145 is equal to the size of the inlet pipe 141, the size of the throat pipe 143 is, for example, smaller than the size of the outlet pipe 145 and the size of the inlet pipe 141, the size of the contraction tube 142 is gradually reduced from the size of the inlet pipe 141 to the size of the throat pipe 143, and the size of the diffusion pipe 144 is gradually increased from the size of the throat pipe 143 to the size of the outlet pipe 145. Among them, the present invention does not limit the cross-sectional shapes of the inlet pipe 141, the contraction tube 142, the throat pipe 143, the diffusion pipe 144 and the outlet pipe 145, and takes the longitudinal cross-section of the inlet pipe 141, the contraction tube 142, the throat pipe 143, the diffusion pipe 144 and the outlet pipe 145 as an example to illustrate the micro-nano ozone bubble generator 14. Specifically, and The ratio is, for example, (3-4):1, the length and diameter of the throat 143 The ratio is, for example, (2-3):1. In a specific embodiment of the present invention, the diameters of the outlet pipe 145 and the inlet pipe 141 are For example, the diameter of the throat 143 is 40 mm to 60 mm. For example, it is 10mm-20mm, the length of the throat 143 is for example 20mm-60mm, the length of the contraction tube 142 is for example smaller than the length of the diffusion tube 144, the contraction angle α of the contraction tube 142 is for example 21°-27°, and the diffusion angle β of the diffusion tube 144 is for example 9°-13°.

[0051] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, an air inlet channel 147 is provided on the throat 143, and the air inlet channel 147 is communicated with the inside of the throat 143. The number of the air inlet channel 147 is, for example, at least one. When there are multiple air inlet channels 147, the multiple air inlet channels 147 are evenly distributed on the throat 143 along the circumference, and the diameter of the air inlet channel 147 is, for example, 0.5 mm-2 mm. In this embodiment, there are, for example, three air inlet channels 147.

[0052] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, the ozone generator 15 is connected to the micro-nano ozone bubble generator 14. Specifically, the ozone generator 15 is connected to the air inlet 147, and the output ozone enters the throat 143 in the micro-nano ozone bubble generator 14 through the air inlet 147. Compared with the water-gas pulse mixed cleaning and vaporized hydrogen peroxide disinfection method, by setting the ozone generator 15, the cooling water system can be cleaned and disinfected efficiently and without secondary pollution, and the cleaning and disinfection device can also be widely used in nuclear power plants, semiconductor manufacturing, food processing, medical and pharmaceutical industries.

[0053] See also Figure 1 to Figure 2As shown, in one embodiment of the present invention, in the micro-nano ozone bubble generator 14, the cooling water at the outlet of the circulation pump 13 flows into the contraction tube 142 through the inlet pipe 141. As the size of the contraction tube 142 gradually decreases, the flow rate of the cooling water increases, and the pressure decreases. Based on the Bernoulli principle, a negative pressure is formed at the throat 143, causing the throat 143 to automatically inhale the ozone output by the ozone generator 15. The ozone and the cooling water are fully mixed in the throat 143 and then flow into the diffusion tube 144. As the size of the diffusion tube 144 gradually increases, the flow rate of the cooling water in the diffusion tube 144 decreases, and the pressure rises. At the same time, the ozone is sheared and broken into ozone bubbles, and the ozone bubbles and the cooling water flow out of the diffusion tube 144 and the outlet pipe 145 together. Therefore, the outlet of the micro-nano ozone bubble generator 14 outputs a mixture of ozone bubbles and cooling water to the inlet of the circulation pump 13. Among them, the ozone bubbles are, for example, micro-nano ozone bubbles, and the average particle size of the ozone bubbles is, for example, 0.1 μm-50 μm, and for example, 1 μm, and the concentration of ozone in the cooling water is, for example, 0.1 mg / L-100 mg / L, and for example, 10 mg / L. Since the solubility of ozone in cooling water is low, by setting a micro-nano ozone bubble generator 14 to form micro-nano ozone bubbles, the residence time of ozone in water can be increased, the gas-liquid contact area and the solubility of ozone can be increased, and the cleaning and disinfection effect of ozone on the cooling water system can be effectively improved. Moreover, the micro-nano ozone bubble generator 14 has a simple structure, no complex moving parts, stable and reliable operation, low maintenance cost, and can reduce the energy consumption and cost of the cleaning and disinfection device. At the same time, by controlling the particle size of the ozone bubbles, the ozone bubbles will not cause cavitation and other faults in the circulating pump 13, thereby ensuring that the process of ozone bubble cleaning and disinfection will not affect the normal operation of the cooling water system, and the purpose of online cleaning and disinfection is achieved.

[0054] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, in the micro-nano ozone bubble generator 14, a multi-stage annular step 146 is provided on the diffusion tube 144, and the multi-stage annular step 146 is provided to protrude into the diffusion tube 144. Among them, the multi-stage annular step 146 is, for example, at least one, and when the multi-stage annular step 146 is multiple, the multiple multi-stage annular steps 146 are arranged at intervals on the diffusion tube 144. In this embodiment, the number of the multi-stage annular steps 146 is, for example, 5-10. By providing the multi-stage annular step 146, the turbulence of the cooling water and ozone in the diffusion tube 144 can be increased, and the ozone can be sheared and broken into smaller ozone bubbles, thereby improving the cleaning and disinfection effect of the ozone bubbles on the cooling water system.

[0055] See also Figure 1 to Figure 2As shown, in one embodiment of the present invention, a mixture of ozone bubbles and cooling water output from the outlet of the micro-nano ozone bubble generator 14 flows into the connecting pipe 18 between the water tank 11 and the circulating pump 13, and the mixture circulates in the circulating pump 13, the heat exchanger 12 and the user system 16 together with the cooling water in the connecting pipe 18. At the same time, the ozone bubbles in the mixture continuously flush and clean the connecting pipe 18 between the circulating pump 13, the heat exchanger 12 and the user system 16, killing pathogenic microorganisms and bacterial spores, and the impact force generated when the ozone bubbles burst helps to peel off pollutants such as biofilms on the surface of the connecting pipe 18, and the pollutants are separated from the connecting pipe 18 and circulate in the circulating pump 13, the heat exchanger 12 and the user system 16 together with the mixture and cooling water, and the circulating mixture can spontaneously form a passivation film on the inner wall of the connecting pipe 18 to prevent the growth of microorganisms.

[0056] See also Figure 1 As shown, in one embodiment of the present invention, the filter 17 and the user system 16 are arranged in parallel. Specifically, during the process of cleaning and disinfecting the connecting pipe 18 with the micro-nano ozone bubble solution, the pollutants are separated from the connecting pipe 18, and circulate in the circulating pump 13, the heat exchanger 12 and the user system 16 together with the mixture and the cooling water. If the pollutants in the cooling water system are not removed in time, the pollutants still remain in the cooling water system, and the pollutant content in the cooling water system will exceed the standard, affecting the safety and sanitation of the user system 16. Therefore, by setting the filter 17, part of the mixture, part of the cooling water and part of the pollutants at the outlet of the heat exchanger 12 are introduced into the filter 17, and the filter 17 filters out part of the pollutants in the cooling water system, thereby achieving the purpose of purifying the cooling water system, making the suspended matter content in the cooling water system meet the requirements, and ensuring the safety and sanitation of the user system 16. Moreover, the process of filtering the pollutants by the filter 17 will not affect the normal operation of the circulating pump 13, the heat exchanger 12 and the user system 16, and the cooling water system can be cleaned and disinfected online and continuously. The filtering accuracy of the filter 17 is, for example, 0.1 μm-0.45 μm, and the flow rate of the fluid flowing through the filter 17 accounts for, for example, 10%-50% of the total flow rate of the fluid at the outlet of the heat exchanger 12 .

[0057] See also Figure 1 As shown, in one embodiment of the present invention, a detector 20 is provided on the connecting pipe 18 at the outlet of the heat exchanger 12, and the filter 17 and the user system 16 are located on the downstream branch of the detector 20. The detector 20 detects at least one of the pollutants such as Escherichia coli and anaerobic iron bacteria. By providing the detector 20, the content of pollutants in the cooling water system can be quantified.

[0058] See also Figure 1As shown, in one embodiment of the present invention, a flow regulating valve 19 is provided on the connecting pipe 18 between the filter 17 and the detector 20. Specifically, the flow regulating valve 19 is provided on the branch pipe where the filter 17 is located, and the flow regulating valve 19 is in communication connection with the detector 20. By providing the flow regulating valve 19, the flow rate of the fluid flowing through the filter 17 can be automatically adjusted according to the content of pollutants in the cooling water system detected by the detector 20. Specifically, when the detector 20 detects that the content of pollutants in the cooling water system is greater than the first upper limit value, the opening of the flow regulating valve 19 becomes larger, so that the flow rate of the fluid flowing through the filter 17 increases, and the filter 17 can filter out more pollutants to reduce the content of pollutants in the cooling water system.

[0059] See also Figure 1 As shown, in one embodiment of the present invention, a drain valve 21 is provided on the user system 16. Wherein, when there are multiple user systems 16, a drain valve 21 is provided on each user system 16. By providing the drain valve 21, when the detector 20 detects that the content of pollutants in the cooling water system is greater than the second upper limit value, that is, the pollutants in the cooling water system are seriously exceeded, exceeding the processing capacity of the filter 17 and the micro-nano ozone bubble generator 14 to clean and disinfect the cooling water system, the drain valve 21 is opened, and the cooling water in the cooling water system is discharged out of the system in time, and the fresh water in the water tank 11 is added to the cooling water system, so as to achieve the purpose of replacing the cooling water in the cooling water system, so as to reduce the content of pollutants in the cooling water system. Wherein, the second upper limit value is, for example, greater than the first upper limit value. Moreover, even if the detection value of the detector 20 is less than the second upper limit value, in the process of the filter 17 and the micro-nano ozone bubble generator 14 cleaning and disinfecting the cooling water system, the drain valve of the user system 16 can also be opened to discharge more pollutants from the cooling water system to improve the cleaning and disinfection effect.

[0060] See also Figure 1 to Figure 2 As shown, based on the above-mentioned online cleaning and disinfection device, the present invention also provides an online cleaning and disinfection method enhanced by micro-nano ozone bubbles, which at least includes steps S11-S14.

[0061] Step S11: During the normal operation of the cooling water system, the return water of the user system enters the heat exchanger through the circulation pump and is cooled, and then sent to the user system.

[0062] Step S12, start the ozone generator and the micro-nano ozone bubble generator, the micro-nano ozone bubble generator receives the ozone gas output by the ozone generator and the cooling water at the outlet of the circulation pump, and outputs a mixture of ozone bubbles and cooling water to the connecting pipe.

[0063] Step S13: The mixture removes pollutants attached to the connecting pipe.

[0064] Step S14: start the filter to filter out the pollutants.

[0065] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, in step S11, the temperature of the water circulating between the user system, the circulation pump and the heat exchanger is, for example, 7°C-50°C.

[0066] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, during the normal operation of the cooling water system, in steps S12-S13, the micro-nano ozone bubble generator 14 receives the cooling water at the outlet of the circulation pump 13 and the ozone gas output by the ozone generator 15, and the ozone gas is sheared and broken into micro-nano sized ozone bubbles in the micro-nano ozone bubble generator 14, and the mixture of the ozone bubbles and the cooling water flows from the outlet of the micro-nano ozone bubble generator 14 to the connecting pipe 18 between the water tank 11 and the circulation pump 13, and the mixture is transported to the circulation pump 13 together with the cooling water in the connecting pipe 18. The ozone bubbles in the mixture circulate in the circulation pump 13, the heat exchanger 12 and the user system 16. At the same time, the ozone bubbles in the mixture continuously flush and clean the circulation pump 13, the heat exchanger 12 and the connecting pipe 18 between the user system 16, kill pathogenic microorganisms and bacterial spores, and remove pollutants such as biofilm on the inner surface of the connecting pipe 18. The pollutants are separated from the connecting pipe 18 and circulate in the circulation pump 13, the heat exchanger 12 and the user system 16 together with the mixture and the cooling water. In addition, the circulating mixture can spontaneously form a passivation film on the inner wall of the connecting pipe 18 to prevent the growth of microorganisms.

[0067] See also Figure 1 to Figure 2 As shown, in one embodiment of the present invention, in steps S12-S13, in the mixture output by the micro-nano ozone bubble generator 14, the ozone bubbles can survive in the cooling water for more than one week, which can effectively solve the problem of uneven diffusion of ozone gas in the connecting pipe 18 and improve the cleaning and disinfection effect of the cooling water system. Moreover, the oxidation potential of ozone is 2.07V, and the oxidation potential of hydrogen peroxide is 1.78V. In the mixture of ozone bubbles and cooling water, ozone will accelerate the decomposition to produce ·OH, and the oxidation potential of ·OH is as high as 2.80V, which has higher oxidizability, thereby improving the disinfection and sterilization effect of microorganisms in the connecting pipe 18. In addition, the reaction rate of ozone bubbles is close to 100%, and no residual ozone will be produced. The main decomposition product is non-toxic and harmless oxygen, which will not corrode the substrate of the cooling water system and has good compatibility with the cooling water system, so it can be widely promoted and applied.

[0068] See also Figure 1 to Figure 2As shown, in one embodiment of the present invention, after the pollutants are separated from the connecting pipe 18, in step S14, part of the cooling water mixed with pollutants at the outlet of the heat exchanger 12 is introduced into the filter 17, and the filter 17 filters out the pollutants in the cooling water with a size greater than 0.45 μm, thereby achieving the purpose of purifying the cooling water, making the pollutant content in the cooling water system meet the requirements, and ensuring the safety and hygiene of the user system 16.

[0069] The cooling water system cleaning and disinfection device and cleaning and disinfection method provided in the present application are further described below through several specific embodiments.

[0070] Example 1

[0071] supply Figure 1 The cleaning and disinfection device of the cooling water system shown is not elaborated here. In the micro-nano ozone bubble generator, the diameter of the inlet pipe and the outlet pipe is 50mm, the diameter of the throat pipe is 14mm, the length of the throat pipe is 25mm, the contraction angle α of the contraction pipe is 26°, the diffusion angle β of the diffusion pipe is 11°, and 3 air inlet channels are evenly distributed along the circumference of the throat pipe, and the diameter of the air inlet channel is 1mm.

[0072] Carry out leak test and pressure check on the cleaning and disinfection device, and proceed to the next step if it is normal.

[0073] During the normal operation of the circulating pump, the cooling water circulates in the circulating pump, the heat exchanger and the user system. Then the fluid at the outlet of the heat exchanger is sampled and the concentration of E. coli in the fluid is analyzed to be 6.5×10 5 CFU / mL. The total amount of cooling water is 5.0m 3 .

[0074] Turn on the ozone generator, adjust the micro-nano ozone bubble generator, and add a mixture of micro-nano ozone bubbles and cooling water to the inlet of the circulation pump. The concentration of ozone in the cooling water is 1.0 mg / L, and the average particle size of the ozone bubbles is controlled to be 500 nm.

[0075] The flow regulating valve is adjusted to allow part of the fluid at the heat exchanger outlet to flow through the filter. The filter has a filtration accuracy of 0.45 μm, and the flow of the fluid flowing through the filter accounts for 20% of the total flow of the fluid at the heat exchanger outlet.

[0076] After running continuously for 24 hours in the above state, the fluid at the outlet of the heat exchanger was sampled and analyzed, and no E. coli was detected in the sampled fluid.

[0077] Example 2

[0078] supply Figure 1The cleaning and disinfection device of the cooling water system shown is not elaborated here. In the micro-nano ozone bubble generator, the diameter of the inlet pipe and the outlet pipe is 20mm, the diameter of the throat pipe is 5mm, the length of the throat pipe is 10mm, the contraction angle α of the contraction pipe is 25°, the diffusion angle β of the diffusion pipe is 12°, and 3 air inlet channels are evenly distributed along the circumference of the throat pipe, and the diameter of the air inlet channel is 1mm.

[0079] Carry out leak test and pressure check on the cleaning and disinfection device, and proceed to the next step if it is normal.

[0080] The cooling water circulates in the circulating pump, heat exchanger and user system, and then samples are taken from three locations along the shaft seal water, upstream, midstream and downstream, to test the concentration of anaerobic iron bacteria. The test results are shown in Table 1.

[0081] Turn on the ozone generator, adjust the micro-nano ozone bubble generator, and add a mixture of micro-nano ozone bubbles and cooling water to the inlet of the circulation pump. The concentration of ozone in the cooling water is 5.0 mg / L, and the average particle size of the ozone bubbles is controlled to be 400 nm.

[0082] The flow regulating valve is adjusted to allow part of the fluid at the heat exchanger outlet to flow through the filter. The filter has a filtration accuracy of 0.45 μm, and the flow of the fluid flowing through the filter accounts for 20% of the total flow of the fluid at the heat exchanger outlet.

[0083] Open the drain valve in the shaft seal water line of the user system every 20 minutes and drain 250 mL of water to improve the cleaning and disinfection effect.

[0084] After the cooling water system was continuously cleaned for 3 hours in the above state, samples were taken from three locations along the shaft seal water line, i.e., upstream, midstream and downstream, to test the concentration of anaerobic iron bacteria. The test results are shown in Table 1.

[0085] Example 3

[0086] Three test pieces of carbon steel, stainless steel and copper substrates with specifications of 50×13×2mm were provided. After being polished to 1200 mesh, they were scrubbed with ethanol to remove oil, ultrasonically cleaned, dried and weighed, and the morphology was microscopically analyzed using a scanning electron microscope.

[0087] The three test pieces were immersed in a 30℃ desalted water test device and placed in a fume hood, and micro-nano ozone bubbles were continuously introduced. The mass concentration of ozone in the desalted water was 20mg / L, the average particle size of the ozone bubbles was 800nm, and the immersion time was 72h.

[0088] After immersion, the test pieces were rinsed with deionized water, dried and weighed. The surface of the test pieces was as bright as before. The corrosion rate was calculated based on the weight change. The calculation results are shown in Table 2. The microscopic morphology changes were analyzed using a scanning electron microscope at 10,000 times. There were no pitting defects on the surfaces of the three test pieces. Among them, corrosion rate = (mass before immersion - mass after immersion) / (time × exposure area × density).

[0089] Table 1 Test results of Example 2

[0090] Sampling point Total colony count before cleaning CFU / mL Total colony count after cleaning CFU / mL Seal water upstream <![CDATA[7.2×10 3 ]]> Not detected Shaft seal water downstream <![CDATA[1.3×10 3 ]]> Not detected Downstream of shaft seal water <![CDATA[0.1×10 3 ]]> Not detected

[0091] Table 2 Test results of Example 3

[0092]

[0093]

[0094] From the test results of Examples 1-2, it can be seen that the cleaning and disinfection device provided by the present invention has a removal rate of 100% for Escherichia coli and anaerobic iron bacteria in the cooling water system, which shows that the cleaning and disinfection device provided by the present invention can effectively remove microbial flora and ensure the hygiene and safety of the cooling water system and the user system.

[0095] It can be seen from Table 2 that in the cleaning and disinfection device provided by the present invention, the micro-nano ozone bubbles will not cause corrosion to carbon steel, stainless steel and copper substrates, which indicates that the cleaning and disinfection device provided by the present invention will not corrode the substrates of connecting pipes, circulation pumps, heat exchangers and user systems, and will not affect the normal operation of the cooling water system.

[0096] In summary, the present invention provides an online cleaning and disinfection device and method enhanced by micro-nano ozone bubbles. Based on the cavitation effect of the instantaneous bursting of micro-nano cavitation bubbles to form a strong impact force and produce strong oxidative free radicals, the cleaning and disinfection of the connecting pipes can be completed at one time without affecting the operation of the cooling water system and the safety of the equipment, thus avoiding the impact of equipment shutdown on enterprise production, energy-saving and high efficiency, and having good economic benefits and broad market prospects. Moreover, the cleaning and disinfection device and method provided by the present invention do not use hazardous chemicals throughout the process, which can greatly reduce the risk of on-site operations.

[0097] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A micro-nano ozone bubble enhanced online cleaning and disinfection device, characterized in that: At least: Water tank; a heat exchanger connected to the water tank; A circulation pump, arranged between the water tank and the heat exchanger; A micro-nano ozone bubble generator, the inlet of which is connected to the pipeline between the circulation pump and the heat exchanger, and the outlet of which is connected to the inlet of the circulation pump; An ozone generator, connected to the micro-nano ozone bubble generator; at least one user system, with an inlet connected to an end of the heat exchanger away from the circulation pump, and an outlet connected to an end of the circulation pump close to the water tank; A filter is arranged in parallel with the user system; as well as A connecting pipeline sequentially connects the water tank, the circulating pump, the heat exchanger, the user system and the circulating pump.

2. The online cleaning and disinfection device according to claim 1 is characterized in that: The micro-nano ozone bubble generator comprises an inlet pipe, a contraction pipe, a throat pipe, a diffusion pipe and an outlet pipe which are connected in sequence, the inlet of the inlet pipe is connected to one end of the circulation pump close to the heat exchanger, and the outlet of the outlet pipe is connected to one end of the circulation pump close to the water tank.

3. The online cleaning and disinfection device according to claim 2 is characterized in that: The diameter ratio of the inlet pipe and the outlet pipe to the throat pipe is (3-4):1, the ratio of the length and diameter of the throat pipe is (2-3):1, the contraction angle of the contraction pipe is 21°-27°, and the diffusion angle of the diffusion pipe is 9°-13°.

4. The cleaning and disinfection device according to claim 2, characterized in that: The micro-nano ozone bubble generator further comprises at least one air inlet channel, which is arranged on the throat pipe and communicated with the interior of the throat pipe.

5. The online cleaning and disinfection device according to claim 1, characterized in that: The cleaning and disinfection device also includes a detector, which is arranged on the connecting pipe on the outlet side of the heat exchanger, and the filter and the user system are located on the downstream branch of the detector.

6. The online cleaning and disinfection device according to claim 5, characterized in that: The cleaning and disinfection device also includes a flow regulating valve, which is arranged on the branch pipeline where the filter is located.

7. The online cleaning and disinfection device according to claim 6, characterized in that: The cleaning and disinfection device also includes a drain valve, which is arranged on the user system.

8. The online cleaning and disinfection device according to claim 7, characterized in that: The flow regulating valves are each connected to the detector for communication.

9. A micro-nano ozone bubble enhanced online cleaning and disinfection method, characterized in that: The cleaning and disinfection device according to any one of claims 1 to 8 comprises at least the following steps: During the normal operation of the cooling water system, the return water from the user system enters the heat exchanger through the circulation pump and is cooled before being sent to the user system; Starting the ozone generator and the micro-nano ozone bubble generator, the micro-nano ozone bubble generator receives the ozone gas output by the ozone generator and the cooling water at the outlet of the circulation pump, and outputs a mixture of ozone bubbles and cooling water to the connecting pipe; The mixture strips away contaminants attached to the connecting pipe; and The filter is activated to filter out the contaminants.

10. The online cleaning and disinfection method according to claim 9, characterized in that: In the mixture, the concentration of ozone in the cooling water is 0.1 mg / L-100 mg / L, and the average particle size of the ozone bubbles is 0.1 μm-50 μm.

Images