Purification and regeneration system for working solution

Abstract

The invention relates to the field of working solution retreatment, in particular to a working solution purification and regeneration system which comprises an electric control box, a sterilization module and a function regeneration module, and the sterilization module and the function regeneration module are both electrically connected with the electric control box. The sterilization module comprises a heater, a circulating pump, a dialysis fine filtration device, a first liquid level meter and a fine filtration purification cylinder used for containing working liquid in use, the function regeneration module comprises a liquid pumping mixer, a second liquid level meter and a function regeneration cylinder used for containing regenerated liquid, and the liquid pumping mixer is connected with a stock solution cylinder; a second flow meter and a water adding valve are installed on the liquid pumping mixer, a liquid distribution valve is installed between the circulating pump and the liquid pumping mixer, and a return valve is further installed on the circulating pump. The product can realize impurity and bacteria removal and concentration adjustment of the working solution, so that the working solution can be always in an effective state, long-term recycling of the working solution is realized, waste liquid discharge is not generated any more, and waste working solution is not subjected to hazardous waste treatment any more.

Description

Technical Field

[0001] The present invention relates to the field of reprocessing of working fluids, and specifically to a purification and regeneration system for working fluids. Background Art

[0002] A large amount of water-based cutting fluids, grinding fluids, cleaning fluids, forming fluids such as stamping, stretching and wire drawing are used in the processing of various parts. Most of these working fluids are made into concentrated stock solutions with mineral oil, emulsifier and various additives, and then diluted with water to form cutting fluids, grinding fluids, cleaning fluids and forming fluids. During their use, they will be mixed with chip slag, dirty oil or infected with anaerobic bacteria and other microorganisms. The effective components gradually decay, and the fine impurities gradually increase, resulting in deteriorated performance, and the reproduction of microorganisms leads to corruption and stench. The traditional management mode is to replace the new fluid when it can no longer be used, which is defined as "replacing with waste" in this article.

[0003] Sterilizing the cutting fluid can extend its service life, but chemical reactions will occur when using fungicides or ozone for sterilization, which will further damage the quality of the cutting fluid; the effect of ultraviolet irradiation for sterilizing the cutting fluid is even worse due to poor transparency and short flow contact time.

[0004] Replacing with waste for water-based machining fluids is a traditional method to ensure machining quality, but the generated waste liquid is not environmentally friendly. Continuously preparing new fluids for replacement will consume a large amount of water resources, and the treatment of hazardous waste will increase production costs.

[0005] These waste liquids usually contain dirty oil, surfactants, metal ions, suspended impurities, mildew and bactericide and other various additives. Arbitrarily discharging the waste liquid will pollute water resources and soil, poison aquatic organisms, and cause various damages to the ecological environment. The above waste liquid is listed as HW09 hazardous waste in the national hazardous waste list.

[0006] The consumption of such water-based working fluids in China's manufacturing industry is very large. It is estimated that the output of metal cutting water-based machining fluids alone is as high as more than 700,000 tons. When diluted with water, more than 12 million tons of water are consumed annually, and more than 13 million tons of waste liquid are generated. The annual consumption of water-based cleaning fluids for machining parts by cleaning machines is between 500,000 and 1 million tons. Coupled with forming fluids, wire drawing fluids, etc., a large amount of waste liquid of water-based machining fluids has caused great environmental protection pressure and waste of water resources.

[0007] At present, various hazardous waste treatment methods are used to turn such hazardous waste liquids into drainable waste liquids, or technologies such as low-temperature evaporation are used to recover water from the waste liquids for reuse, and the waste liquids are reduced in volume and then treated as hazardous waste. However, there are still problems such as high cost of chemical treatment, the generated clarified liquid needs to be further treated to meet the standards, and high investment and maintenance and replacement costs.

[0008] With the continuous development of China's manufacturing industry, the demand for water-based machining fluids is further increasing, and the amount of waste liquid generated is also correspondingly increasing. The "replacing with waste" management mode is facing huge environmental protection pressure.

[0009] Starting from freshly prepared machining fluid, its active ingredients are gradually consumed and weakened during use, impurities gradually increase, some of them can even infect bacteria and emit unpleasant odors, and it gradually decays. However, it does not affect normal use until it finally fails, and this "usable" state can last for several weeks or months. In this article, it is defined as the "qualified and easy-to-use" state.

[0010] The reasons for the failure of the working fluid are as follows: (1) The consumption of active ingredients leads to a decrease in functional activity, affecting the machining quality or cleaning quality; (2) The accumulation concentration of fine impurities is too high, affecting the tool life, surface finish or cleaning cleanliness; (3) The growth of bacteria leads to deterioration and stench.

[0011] If the working fluid can be maintained like regularly maintaining equipment - continuously filtering out fine impurities and replenishing active ingredients as needed to maintain the vitality of the regeneration function, the failure can be avoided and it can be recycled for a long time.

[0012] Working fluids such as aqueous machining fluids and forming fluids are usually compounded and prepared from base oils, surfactants, various additives, metal ions, mold and mildew inhibitors, etc.; cleaning fluids are usually compounded from surfactants, complexing agents, corrosion inhibitors, stabilizers, solubilizers, mold and mildew inhibitors, emulsifiers, etc.

[0013] The methods of maintenance are as follows: (1) Remove impurities and bacteria by means of fine filtration (control anaerobic bacteria below 1000 CFU / ml) to keep it clean; (2) Detect the change of active ingredients and supplement them to restore its functional vitality.

[0014] If, like regularly maintaining and servicing equipment, the machining fluid is regularly maintained and serviced during use, continuously purified and sterilized, and the lost active ingredients are replenished, the cutting fluid will not fail and can be used for a long time. This method is the same as that of nephropathy patients regularly undergoing blood "dialysis" to circulate and remove toxins in the blood, thereby maintaining their vital vitality. By continuously purifying and regenerating, controlling the fine impurities and bacteria in the working fluid within the permitted range, and adjusting the concentration to achieve the regeneration function, the functional activity of the working fluid can be maintained, deterioration and stench can be avoided, and it can be recycled for a long time without being discharged as waste liquid. Summary of the Invention

[0015] To achieve the above object, the object of the present invention is to provide a purification and regeneration system for working fluid, which can solve the problems existing in the background technology. The present invention provides the following technical solutions:

[0016] A purification and regeneration system for a working fluid, comprising an electric control box, a sterilization module and a functional regeneration module. The sterilization module and the functional regeneration module are both installed on a machine base and are electrically connected to the electric control box. The sterilization module includes a heater, a circulation pump, a dialysis and fine filtration device, a first liquid level gauge and a fine filtration and purification cylinder for placing the working fluid in use. The first liquid level gauge and the circulation pump are both connected to the fine filtration and purification cylinder, and the circulation pump is also connected to the dialysis and fine filtration device. The heater is installed at the lower part of the fine filtration and purification cylinder. Control valves are installed between the dialysis and fine filtration device and the circulation pump and between the dialysis and fine filtration device and the fine filtration and purification cylinder. An inlet valve, a switching valve and a drain valve are installed on the fine filtration and purification cylinder. The functional regeneration module includes a liquid extraction mixer, a second liquid level gauge and a functional regeneration cylinder for placing the regeneration liquid. The liquid extraction mixer and the second liquid level gauge are both connected to the functional regeneration cylinder. A concentration gauge is installed on the functional regeneration cylinder. The functional regeneration cylinder is also connected to the dialysis and fine filtration device, the circulation pump and a stock solution cylinder respectively. The liquid extraction mixer is connected to the stock solution cylinder. A stock solution valve and a first flowmeter are installed on the stock solution cylinder. A second flowmeter and a water addition valve are installed on the liquid extraction mixer. A liquid distribution valve is installed between the circulation pump and the liquid extraction mixer. A return valve is also installed on the circulation pump. The circulation pump sends the working fluid in use in the fine filtration and purification cylinder into the dialysis and fine filtration device. The dialysis and fine filtration device removes impurities and bacteria from the working fluid in use. The working fluid in use after removing impurities and bacteria flows back to the fine filtration and purification cylinder. The working fluid in use will gradually decrease during continuous cyclic filtration between the circulation pump and the dialysis and fine filtration device. When the liquid level in the fine filtration and purification cylinder drops to a low level, the first liquid level gauge sends a low-level detection signal to control the opening of the inlet valve. When the liquid is added to a high level, the first liquid level gauge sends a high-level detection signal and the inlet valve closes to stop adding liquid. The working fluid can continue cyclic filtration. When the temperature of the working fluid is too low or the viscosity is too high, appropriate heating is required to raise the temperature. At this time, the heater works, which can improve the dialysis and fine filtration efficiency. The number of fine impurities and bacteria intercepted by dialysis and ultrafiltration in the working fluid will accumulate and increase, and the concentration will also increase. When the viscosity increases to an extent that is not conducive to pumping and circulating by the circulation pump, the switching valve and the drain valve at the bottom of the fine filtration and purification cylinder are opened to discharge the thick and dirty liquid, and then the inlet valve is opened to input the working fluid in use to start the next round of fine filtration. The small amount of thick and dirty liquid discharged can be mixed with sawdust and dried for solid waste treatment. The adjustment process of the concentration of the working fluid in use is as follows: Set the concentration parameter on the electric control box. The liquid level signal is measured by the second liquid level gauge to calculate the quantity of the liquid to be prepared. The concentration of the regeneration liquid is monitored in real time by the concentration gauge. If the measured concentration is too low, the circulation pump, the liquid distribution valve and the stock solution valve are opened for liquid extraction and circulation. Negative pressure is generated in the liquid extraction mixer, and the required amount of stock solution is drawn in through the stock solution valve and the first flowmeter. They are quickly mixed in the liquid extraction mixer, and then are cut and stirred evenly at high speed by the impeller of the circulation pump to be fully mixed into the working fluid with the required concentration.If the measured concentration is too high, open the water addition valve, input the required water through the second flowmeter, open the circulation pump and the liquid preparation valve for circulating stirring and mixing until the set concentration is reached, then open the return valve and close the liquid preparation valve. The circulation pump will send the regenerated liquid with adjusted concentration into the fine filtration and purification cylinder for reuse. The process of configuring a new working liquid is as follows: First, open the water addition valve to input water and accurately measure it according to the liquid preparation volume set by the electric control box, then open the circulation pump, the liquid preparation valve and the stock solution valve to suck in the stock solution. The sucked-in volume of the stock solution is accurately measured by the first flowmeter and controlled by the stock solution valve. The sucked-in stock solution is quickly mixed in the liquid suction mixer, and then undergoes high-speed cutting and uniform stirring by the impeller of the circulation pump to be fully mixed into a working liquid with the required concentration. Open the return valve and close the liquid preparation valve, and the circulation pump will send the prepared working liquid into the fine filtration and purification cylinder. The process of automatic liquid supplementation during equipment operation: Open the circulation pump and the return valve, and supplement the required amount of working liquid according to the liquid level signal in the liquid using equipment box. The purification and regeneration of the working liquid are processed in parallel during the operation of the working liquid. A part of the in-use working liquid is drawn out for bypass circulation maintenance, and the maintained working liquid is sent back to the liquid using equipment for cyclic use. In this way, the bypass treatment does not affect the operation of the original equipment and the working liquid. The bypass circulation volume can be calculated according to the total amount of the working liquid and the failure cycle of the working liquid to ensure that the bacteria in the in-use working liquid are always controlled below 1000 CFU / ml, which is economically reasonable, ensuring that the working liquid is continuously in a qualified and usable state and can be recycled for a long time without failure and scrapping.

[0017] As a further solution of the present invention: The dialysis fine filtration device includes a housing and a sterilization filter membrane unit installed inside the housing. The sterilization filter membrane unit includes a filter membrane and a ceramic membrane filter tube. The filter membrane is sintered on the surface of the ceramic membrane filter tube, and the pore diameter of the filter membrane can be selected according to the size of bacteria to intercept a certain type of bacteria, which is called a "sterilization filter membrane". Generally, impurities and bacteria with a size of more than 0.5 microns can be filtered. The separation process of bacteria is based on the "cross-flow filtration" mode, where the fluid flows tangentially on the surface of the filter membrane, which not only reduces the blockage of the filter membrane pores but also realizes the precise interception and filtration of a certain type of bacteria through pore size selective screening.

[0018] As a further solution of the present invention: The dialysis fine filtration device is connected by a flange and connecting bolts, and a stop valve is also installed on the dialysis fine filtration device. Since the processing capacity of the sterilization filter membrane unit may decrease due to fouling and blockage after a long time of use, at this time, close the stop valve, remove the flange and the connecting bolts, and the whole unit can be taken off and replaced with a spare part for continuous use. The replaced sterilization filter membrane unit can be reused after cleaning.

[0019] As a further solution of the present invention: Both the fine filtration and purification cylinder and the functional regeneration cylinder are made of PVC or 306 materials, which are easy to process and have a long service life.

[0020] As a further solution of the present invention: The regulating valve, the water addition valve, the liquid preparation valve, the return valve, the inlet valve, the switching valve and the drain valve are all made of PVC or 306 materials.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The product is reasonably designed. Through the cooperation of various components, impurity removal, bacteria removal and concentration adjustment of the working fluid are achieved, so that the working fluid can always be in an effective state, realizing the long-term recycling of the working fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a side view of the purification and regeneration system of the working fluid in the embodiment of the present invention.

[0024] Figure 2 It is a front view of the purification and regeneration system of the working fluid in the embodiment of the present invention.

[0025] Figure 3 It is a top view of the purification and regeneration system of the working fluid in the embodiment of the present invention.

[0026] Figure 4 It is a working principle diagram of the purification and regeneration system of the working fluid in the embodiment of the present invention.

[0027] Figure 5 It is a comparison diagram of the working of the cutting fluid in the existing manner and that of the present invention.

[0028] Figure 6 It is a comparison diagram of the working of the cleaning fluid in the existing manner and that of the present invention.

[0029] In the figure: 2 - switching valve; 3 - liquid distribution valve; 4 - machine base; 5 - second liquid level gauge; 6 - circulation pump; 7 - return valve; 8 - electric control box; 9 - regulating valve; 10 - concentration meter; 11 - dialysis and fine filtration device; 12 - liquid extraction mixer; 13 - functional regeneration cylinder; 14 - heater; 15 - fine filtration and purification cylinder; 16 - first liquid level gauge; 17 - drain valve, 18 - dialysis effluent pipe; 19 - stop valve; 20 - inlet valve; 21 - first flow meter; 22 - second flow meter; 23 - stock solution valve; 24 - water adding valve; 25 - stock solution cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0031] The following will describe in detail the specific implementation of the present invention with reference to specific embodiments.

[0032] Embodiment 1, please refer to Figures 1 - 4, A purification and regeneration system for a working fluid provided by an embodiment of the present invention includes an electric control box 8, a sterilization module, and a functional regeneration module. The sterilization module and the functional regeneration module are both installed on the machine base 4 and are both electrically connected to the electric control box 8. The sterilization module includes a heater 14, a circulation pump 6, a dialysis and fine filtration device 11, a first liquid level gauge 16, and a fine filtration and purification cylinder 15 for placing the working fluid in use. The first liquid level gauge 16 and the circulation pump 6 are both connected to the fine filtration and purification cylinder 15, and the circulation pump 6 is also connected to the dialysis and fine filtration device 11. The heater 14 is installed at the lower part of the fine filtration and purification cylinder 15. A regulating valve 9 is installed between the dialysis and fine filtration device 11 and the circulation pump 6, and between the dialysis and fine filtration device 11 and the fine filtration and purification cylinder 15. An inlet valve 20, a switching valve 2, and a drain valve 17 are installed on the fine filtration and purification cylinder 15. The functional regeneration module includes a liquid extraction mixer 12, a second liquid level gauge 5, and a functional regeneration cylinder 13 for placing the regeneration liquid. The liquid extraction mixer 12 and the second liquid level gauge 5 are both connected to the functional regeneration cylinder 13. A concentration meter 10 is installed on the functional regeneration cylinder 13. The functional regeneration cylinder 13 is also respectively connected to the dialysis and fine filtration device 11, the circulation pump 6, and the stock solution cylinder 25. The liquid extraction mixer 12 is connected to the stock solution cylinder 25. A stock solution valve 23 and a first flow meter 21 are installed on the stock solution cylinder 25. A second flow meter 22 and a water adding valve 24 are installed on the liquid extraction mixer 12. A liquid preparation valve 3 is installed between the circulation pump 6 and the liquid extraction mixer 12. A return valve 7 is also installed on the circulation pump 6. The circulation pump 6 sends the working fluid in use in the fine filtration and purification cylinder 15 into the dialysis and fine filtration device 11. The dialysis and fine filtration device 11 removes impurities and bacteria from the working fluid in use. The working fluid in use after removing impurities and bacteria flows back to the fine filtration and purification cylinder 15. The working fluid in use will gradually decrease during continuous circulation and filtration between the circulation pump 6 and the dialysis and fine filtration device 11. When the liquid level in the fine filtration and purification cylinder 15 drops to the low level, the first liquid level gauge 16 sends a low-level detection signal to control the inlet valve 20 to open the valve. When the liquid level reaches the high level after adding liquid, the first liquid level gauge 16 sends a high-level detection signal and the inlet valve 20 closes to stop adding liquid. The working fluid can continue to circulate and filter. When the temperature of the working fluid is too low or the viscosity is too high, appropriate heating and temperature increase are required. At this time, the heater 14 works, which can improve the dialysis and fine filtration efficiency. The number of fine impurities and bacteria intercepted by dialysis and ultrafiltration in the working fluid will accumulate and increase, and the concentration will also increase. When the viscosity increases to an extent that is not conducive to the pumping and circulation of the circulation pump 6, the switching valve 2 and the drain valve 17 at the bottom of the fine filtration and purification cylinder 15 are opened to discharge the thick and dirty liquid, and then the inlet valve 20 is opened to input the working fluid in use to start the next round of fine filtration. The small amount of thick and dirty liquid discharged can be mixed with sawdust and dried for solid waste treatment. The adjustment process of the concentration of the working fluid in use is as follows: Set the concentration parameter on the electric control box 8, measure the liquid level signal by the second liquid level gauge 5, so as to calculate the quantity of the liquid to be prepared, and the concentration of the regeneration liquid is monitored in real time by the concentration meter 10.If the measured concentration is too low, turn on the circulation pump 6, the liquid dispensing valve 3 and the stock solution valve 23 to carry out liquid pumping and circulation. A negative pressure is generated in the liquid pumping mixer 12, and the required amount of stock solution is pumped in through the stock solution valve 23 and the first flowmeter 21. It is quickly mixed in the liquid pumping mixer 12, and then undergoes high-speed cutting and uniform stirring by the impeller of the circulation pump 6 to be fully mixed into the working fluid with the required concentration. If the measured concentration is too high, turn on the water adding valve 24, input the required water through the second flowmeter 22, turn on the circulation pump 6 and the liquid dispensing valve 3 for circulating stirring and mixing until the set concentration is reached. Then turn on the return valve 7 and close the liquid dispensing valve 3, and the circulation pump 6 sends the regenerated fluid with adjusted concentration into the fine filter purification cylinder 15 for reuse. The process of configuring a new working fluid is as follows: First, turn on the water adding valve 24 to input water and accurately measure it according to the liquid dispensing volume set by the electric control box 8. Then turn on the circulation pump 6, the liquid dispensing valve 3 and the stock solution valve 23 to pump in the stock solution. The amount of stock solution pumped in is accurately measured by the first flowmeter 21 and controlled by the stock solution valve 23. The pumped-in stock solution is quickly mixed in the liquid pumping mixer 12, and then undergoes high-speed cutting and uniform stirring by the impeller of the circulation pump 6 to be fully mixed into the working fluid with the required concentration. Turn on the return valve 7 and close the liquid dispensing valve 3, and the circulation pump 6 sends the configured working fluid into the fine filter purification cylinder 15. The process of automatic liquid replenishment during equipment operation: Turn on the circulation pump 6 and the return valve 7, and replenish the required amount of working fluid according to the liquid level signal in the liquid using equipment box. The purification and regeneration of the working fluid are processed in parallel during the operation of the working fluid. A part of the in-use working fluid is taken out for bypass circulation maintenance, and the maintained working fluid is sent back to the liquid using equipment for circulation use. In this way, the bypass treatment does not affect the operation of the original equipment and the working fluid. The bypass circulation volume can be calculated based on the total amount of the working fluid and the failure cycle of the working fluid to ensure that the bacteria in the in-use working fluid are always controlled below 1000 CFU / ml, which is economically reasonable, ensuring that the working fluid continuously remains in a qualified and usable state for long-term circulation use without failure and scrapping.

[0033] In one embodiment of the present invention, the dialysis fine filter device 11 includes a housing and a sterilization filter membrane unit installed inside the housing, with mature technology, good use effect, and easy to obtain in the market.

[0034] In one embodiment of the present invention, the sterilization filter membrane unit includes a filter membrane and a ceramic membrane filter tube. The filter membrane is sintered on the surface of the ceramic membrane filter tube. The pore size of the filter membrane can be selected according to the size of bacteria to intercept certain types of bacteria, which is called a "sterilization filter membrane". Generally, impurities and bacteria above 0.5 microns can be filtered. The separation process of bacteria is based on the "cross-flow filtration" mode. The fluid flows tangentially on the surface of the filter membrane, which not only reduces the blockage of the filter membrane pores but also realizes the precise interception and filtration of certain types of bacteria through pore size selective screening.

[0035] In one embodiment of the present invention, the dialysis and fine filtration device 11 is connected by a flange and connecting bolts. A stop valve 19 is also installed on the dialysis and fine filtration device 11. Since the processing capacity of the sterilizing filter membrane unit may decrease due to dirt blockage after being used for a long time, at this time, the stop valve 19 is closed, the flange and the connecting bolts are removed, and the whole can be taken off and replaced with a spare part for continued use. The replaced sterilizing filter membrane unit can be reused after cleaning, reducing the equipment cost.

[0036] In one embodiment of the present invention, both the fine filtration and purification cylinder 15 and the function regeneration cylinder 13 are made of PVC or 306 material, which is convenient for processing and has a long service life.

[0037] In one embodiment of the present invention, the regulating valve 9, the water adding valve 24, the liquid dispensing valve 3, the return valve 7, the liquid inlet valve 20, the switching valve 2, and the liquid discharging valve 17 are all made of PVC or 306 material.

[0038] The existing technology of "generating waste liquid first and then treating it" and the "purification, regeneration and reuse" of this product are two different technical solutions. For working fluids such as cutting fluids and cleaning fluids, the differences between the two technical solutions can be expressed by the management mode diagram of the working fluid, as shown in Figure 5 and Figure 6 .

[0039] Figure 5 and Figure 6 The horizontal axis of is the working fluid usage time axis, and the vertical axis is the pollution degree axis of the in-use working fluid. The arrow diagonal line indicates the quality change of the processing fluid from the newly prepared state during use as the usage time extends. Figure 5 The left figure of and Figure 6 The left figures of are respectively the traditional technical solutions for the generation of waste liquid from cutting fluid and cleaning fluid with hazardous waste treatment. It can be seen from the left figure of Figure 5 The left figure of and Figure 6 The left figure of that the effective components of the newly prepared cutting fluid and cleaning fluid are gradually consumed and weakened during use, the impurities gradually increase, and the anaerobic bacteria slowly multiply and increase. However, they are still in the "qualified and easy-to-use" state in the first few months. The odor emission and performance decay gradually become serious over time. After about half a year, they finally deteriorate, stink and fail, and then are poured out for hazardous waste treatment, and a new liquid is prepared for use. This traditional management mode of cutting fluid and cleaning fluid continuously "manufactures waste liquid" while continuously manufacturing products. Different qualities of working fluids have different times. Some enterprises pour them out for hazardous waste treatment every 3 months and prepare a new liquid for use. This technical solution is causing the hazardous waste treatment industry to grow in scale.

[0040] Figure 5 The right figure of and Figure 6 The right figures of are respectively the new technical solutions for cutting fluid and cleaning fluid without generating waste liquid and without hazardous waste treatment. It can be seen from the right figure of Figure 5 The right figure of and Figure 6As can be seen from the right figure, during the "qualified and useful" stage of the working fluid (for example, around 4 months, which may vary for different working fluids), purification and regeneration maintenance is carried out to keep the working fluid in the "qualified and useful" state through purification and regeneration, preventing it from becoming "waste liquid" and reducing "waste liquid treatment" at the source. If the treatment cycle is shortened to 2 months, the quality of the in-use working fluid during purification and regeneration will be better. If it is shortened to 1 month, the quality of the in-use working fluid during purification and regeneration will be almost the same as that of newly prepared working fluid.

[0041] From Figure 5 and Figure 6 it can be seen that the traditional method is to first let waste liquid be generated during the production process and then treat the waste liquid. As the amount of waste liquid generated in industrial manufacturing increases, the amount of waste liquid to be treated in full by the traditional technical solution also increases, which will impose a huge burden on environmental protection and cause waste of resources. It is an unsustainable working fluid management model. The new technical solution of this product is to prevent waste liquid from being generated during the production process and replace hazardous waste treatment with purification and regeneration maintenance, greatly reducing the environmental protection burden and saving a large amount of resources. It is a sustainable working fluid management model.

[0042] The new technical solution proposed by this product defines the quality that can be normally used before the working fluid fails as the "qualified and useful" level. The new technical solution needs to determine the economically reasonable treatment cycle and cyclic treatment volume required to maintain the "qualified and useful" state.

[0043] The bypass cyclic treatment cycle and treatment volume of the new technical solution are calculated based on the total amount of the working fluid in the equipment and the time when the working fluid concentration decay exceeds the standard or the time when the bacterial reproduction quantity exceeds the standard.

[0044] Taking the working fluid with a total volume of 10m 3 as an example, if a circulation volume of 1m 3 / h is used for bypass circulation, then theoretically all the working fluid can be circulated and treated in 10 hours.

[0045] If the measured time when the working fluid concentration decay exceeds the standard is 100 hours and the time when the bacterial reproduction quantity exceeds the standard is 150 hours, and a circulation volume of 1m 3 / h is used for bypass circulation, then the treatment cycle calculated according to the shorter time when the standard is exceeded is as follows:

[0046] Treatment cycle (hours) = 100h - (10m 3 / 1m 3 / h) = 90h

[0047] If a circulation volume of 5m 3 / h is used for bypass circulation, then theoretically all the working fluid can be circulated and treated in 2 hours, and the treatment cycle (hours) = 100h - (10m 3 / 5m 3 / h) = 98h

[0048] In addition to the total amount and quality of the working fluid, the size of the circulating treatment volume is also related to the amount of equipment investment. On the premise that the concentration attenuation and bacterial reproduction do not exceed the standard, it is obviously more reasonable and advisable to choose a smaller circulating treatment volume in terms of technical and economic evaluation. The technical solution of this product is proposed based on this technical feature - that is, taking the ability to keep the working fluid "qualified and easy to use" and not turn into waste liquid as the basis for determining the purification and regeneration cycle and the bypass circulation volume.

[0049] This technical solution can be realized by concentration sensor detection + bacterial reproduction number detection + electronic control system (applicable to large systems), or can be completed by manual detection and adjustment (applicable to small systems with low-cost investment).

[0050] It should be noted that in the present invention, unless otherwise clearly specified and limited, terms such as "fixed" and "set" should be understood in a broad sense. For example, it can be a welded connection, a bolt connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A purification and regeneration system for a working fluid, comprising an electric control box, a sterilization module, and a functional regeneration module. The sterilization module and the functional regeneration module are both installed on a machine base, and the sterilization module and the functional regeneration module are both electrically connected to the electric control box. It is characterized in that, The sterilization module includes a heater, a circulation pump, a dialysis fine filtration device, a first liquid level gauge, and a fine filtration purification cylinder for placing the working liquid in use. The first liquid level gauge and the circulation pump are both connected to the fine filtration purification cylinder, and the circulation pump is also connected to the dialysis fine filtration device. The heater is installed at the lower part of the fine filtration purification cylinder. Control valves are installed between the dialysis fine filtration device and the circulation pump and between the dialysis fine filtration device and the fine filtration purification cylinder. An inlet valve, a switching valve, and a drain valve are installed on the fine filtration purification cylinder. The function regeneration module includes a liquid extraction mixer, a second liquid level gauge, and a function regeneration cylinder for placing the regeneration liquid. The liquid extraction mixer and the second liquid level gauge are both connected to the function regeneration cylinder. A concentration gauge is installed on the function regeneration cylinder. The function regeneration cylinder is also connected to the dialysis fine filtration device, the circulation pump, and the stock solution cylinder respectively. The liquid extraction mixer is connected to the stock solution cylinder. A stock solution valve and a first flowmeter are installed on the stock solution cylinder. A second flowmeter and a water addition valve are installed on the liquid extraction mixer. A liquid preparation valve is installed between the circulation pump and the liquid extraction mixer. A return valve is also installed on the circulation pump.

2. The purification and regeneration system of the working fluid according to claim 1, wherein The dialysis fine filtration device includes a housing and a sterilization filter membrane unit installed inside the housing.

3. The purification and regeneration system of the working fluid according to claim 1, wherein, The dialysis fine filtration device is connected by flanges and connecting bolts.

4. The purification and regeneration system of the working fluid according to claim 1 or 2, characterized in that, A stop valve is also installed on the dialysis fine filtration device.

5. The purification and regeneration system of the working fluid according to claim 1, wherein Both the fine filtration purification cylinder and the function regeneration cylinder are made of PVC or 306 material.

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