Modularized plasma activated water preparation device and method

Abstract

The invention discloses a modularized plasma activated water preparation device and method.The device comprises a water tank, the water tank is provided with a bottom wall and a side wall, an interlayer space defined by an inner side wall and an outer side wall is arranged in the side wall and serves as a gas-liquid mixing area, a containing cavity is defined by the bottom wall and the inner side wall, and one part of the containing cavity serves as a cooling water area; the interlayer space is provided with a water inlet hole and a water outlet hole; the independent air chambers are located below the cooling water area in the containing cavity, the top walls of the air chambers are provided with air inlet holes externally connected with an air pump, and the side walls of the air chambers are provided with a plurality of small air outlet holes communicating the air chambers with the interlayer space; the electrode assemblies comprise a plurality of medium pipes arranged in parallel and inner wall electrodes correspondingly arranged in the medium pipes in a penetrating mode, the inner wall electrodes in the adjacent medium pipes serve as high-voltage electrodes and grounding electrodes respectively, and the medium pipes penetrate through the corresponding air chambers and the water tank in a sealed mode. The problems that a traditional preparation device is unstable in discharge, low in plasma activated water preparation efficiency and the like are solved.

Description

Technical Field

[0001] The present application relates to the field of plasma activated water preparation, and in particular to a modular plasma activated water preparation device and method. Background Art

[0002] Plasma activated water (PAW) is an active aqueous solution with low pH, high redox potential and high conductivity produced by dissolving highly active oxygen and active nitrogen substances into water through low-temperature plasma technology. The solution includes components such as hydroxyl, hydrogen peroxide, nitrate, and nitrite. These active species have very strong oxidizing properties and can react extensively with cell membranes, DNA, proteins and other cell components of microorganisms through various mechanisms, thereby inactivating the microorganisms. In this way, plasma activated water has significant bactericidal and fresh-keeping effects, can quickly inactivate bacteria, viruses and other microorganisms in water, has a broad-spectrum bactericidal effect, and effectively avoids the drug resistance problem caused by the single bactericidal method of traditional chemical disinfectants.

[0003] Studies have shown that plasma activated water can effectively kill common pathogens such as Escherichia coli, Staphylococcus aureus, and Salmonella, and the sterilization effect is significant and fast. When using plasma activated water to wash or soak fresh food, it can sterilize the surface of the food and remove surface microorganisms, delay the decay process of the food, and extend the shelf life of the food. Especially in the preservation of fruits, vegetables, meat and other foods, plasma activated water shows excellent preservation effects, which can reduce the corruption and deterioration of food during storage and extend the shelf life. In addition, plasma activated water can also promote the growth of crops, increase seed germination rate, and reduce the occurrence of diseases.

[0004] Compared with traditional chemical disinfectants, plasma-activated water does not rely on any chemicals. The reaction products of the generated active species in water are mainly oxidizing molecules (such as hydrogen peroxide, ozone, etc.), leaving no chemical residues, which meets the requirements of green environmental protection. As consumers' demand for natural foods without residues and additives increases, the application of plasma-activated water in food storage, packaging, disinfection and other fields will continue to grow.

[0005] At present, the main PAW preparation devices include plasma jet, single-medium coaxial DBD, sliding arc discharge, needle-water inner wall electrode structure, etc. There are common problems such as low efficiency of plasma activated water preparation; excessive water temperature affects the preservation of active ingredients in PAW; small amount of prepared water; large differences in PAW components prepared multiple times, poor stability; some discharge methods are greatly affected by water conductivity, poor compatibility, and poor discharge stability; activated water generated by a single discharge method has poor stability and cannot be stored for a long time. Summary of the invention

[0006] In response to the problems existing in the prior art, the present application provides a modular plasma-activated water preparation device and method, which solves the problems of unstable discharge of traditional preparation devices, low efficiency of plasma-activated water preparation, unstable composition and concentration of active substances in plasma-activated water, and small water treatment volume.

[0007] A modular plasma activated water preparation device, comprising:

[0008] A water tank, the water tank having a bottom wall and a side wall, the side wall having an interlayer space surrounded by an inner side wall and an outer side wall, the interlayer space serving as a gas-liquid mixing area, the bottom wall and the inner side wall forming a receiving cavity, a part of the receiving cavity serving as a cooling water area, the interlayer space having a water inlet and a water outlet;

[0009] A plurality of independent air chambers, wherein the air chambers are located below the cooling water area in the accommodating cavity, the top wall of the air chambers has air inlets, and the side walls of the air chambers have a plurality of air outlet holes connecting the air chambers and the interlayer space;

[0010] A plurality of groups of electrode assemblies, the electrode assemblies comprising a plurality of dielectric tubes arranged in parallel and inner wall electrodes correspondingly arranged in each dielectric tube, the inner wall electrodes in adjacent dielectric tubes serving as high voltage electrodes and grounding electrodes respectively, each group of electrode assemblies corresponding to one of the gas chambers, the dielectric tubes of the electrode assemblies sealingly passing through the corresponding gas chamber and the interlayer space on both sides of the gas chamber in the area above the gas outlet holes;

[0011] The air inlet is connected to an external air pump through an air inlet pipeline, the water inlet is connected to an external raw water supply pump through a liquid inlet pipeline, and the water outlet is connected to a plasma activated water output pipeline.

[0012] In the present application, the inner wall electrode in the electrode assembly is always in the dielectric tube, and the double dielectric barrier discharge prevents the water from contacting the inner wall electrode, thereby improving the safety during high-voltage discharge and effectively avoiding the discharge sparking phenomenon caused by the connection between the water and the inner wall electrode when preparing activated water by underwater discharge. The dielectric tube passes through the water tank and the air chamber. This placement method divides the dielectric tube into a cooling zone-ionization activation zone-cooling zone, reduces the heating temperature of the dielectric tube, and improves the discharge time and working stability. The dielectric tube adopts an array horizontally arranged with the same spacing. The inner wall electrodes in adjacent dielectric tubes are respectively connected to the live wire and the neutral wire of the driving power supply, and a plasma discharge air gap is formed between adjacent dielectric tubes. The multi-array arrangement method increases the plasma discharge gap and improves the discharge efficiency.

[0013] The air outlet holes of the air chamber are arranged below the longitudinal area of ​​the medium tube to prevent water in the gas-liquid mixing area from entering the air chamber and affecting the plasma discharge. At the same time, the tiny air outlet can quickly blow the plasma activated gas into the gas-liquid mixing area to form dense and uniform bubbles to improve the gas-liquid mixing efficiency.

[0014] The cooling water area is above the gas chamber, and heat is transferred to the cooling water area through the top wall of the gas chamber to avoid overheating of the medium pipe, improve the stability of plasma ionization work, reduce the temperature of the gas-liquid mixing area, and reduce the loss of active ingredients in plasma-activated water.

[0015] Gas or pre-ionized plasma activated gas is introduced into the gas chamber through the air inlet hole, and any liquid that does not contain solid particle impurities and needs to be activated is introduced into the gas-liquid mixing area through the water inlet hole. The activated gas containing plasma obtained by ionization in the gas chamber forms tiny bubbles and enters the liquid through the gas outlet holes. The setting of the gas outlet holes allows as many plasma gas microbubbles as possible to pass through the liquid that needs to be activated, thereby improving the activation efficiency.

[0016] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0017] Optionally, in each group of electrode assemblies, the dielectric tubes are located in the same horizontal plane and are arranged at equal intervals, and the inner wall electrodes are arranged close to the inner walls of the dielectric tubes; the length of the inner wall electrodes is shorter than the length of the dielectric tubes in the gas chamber area.

[0018] The length of the inner wall electrode is shorter than the length of the dielectric tube in the gas chamber area, which can avoid the influence of a small amount of water on the discharge caused by the dielectric tube and the gas chamber connection hole. Furthermore, the inner wall electrode is >5mm away from the gas chamber edge.

[0019] Optionally, the material of the medium tube may be a barrier material such as quartz or glass, with an outer diameter of 10 mm and a thickness of 1.5 mm.

[0020] Optionally, the inner wall electrode may be made of a conductive material such as aluminum, copper, stainless steel, etc., with a thickness of 0.1 mm.

[0021] Optionally, a sealing strip is provided on the outer wall surface of the outer wall and at the point where the medium tube passes through; both ends of the medium tube are provided with a packaging cover fixed to the outer wall, the exposed end of the medium tube is packaged in the packaging cover, and a through hole is provided on the packaging cover for the wire to pass through.

[0022] Optionally, the air outlet holes are provided on all side walls of the air chamber; the bottom of the opening of the air outlet holes is flush with the bottom wall of the air chamber; the opening diameter of the air outlet holes is 3 to 4 mm; and the spacing between adjacent air outlet holes is 2 to 3 mm.

[0023] Optionally, the air outlet hole is a semicircular hole with a diameter of 3 to 4 mm, and the bottom of the semicircular hole is flush with the bottom wall of the air chamber, which can better drain away water that may enter the air chamber.

[0024] Optionally, the water tank adopts a transparent box body and is made of transparent material.

[0025] Optionally, the water inlet and outlet are both provided on the inner side wall; the inner side wall is also provided with a through hole connecting the interlayer space and the accommodating cavity, and the through hole also serves as an exhaust / water hole.

[0026] In one embodiment, the air chamber and the water tank are an integrated structure. In this embodiment, the air chamber is separated by a horizontal partition sealed and fixed to the inner wall. The air chamber and the accommodating cavity share part of the inner wall, and the air outlet hole is opened on the inner wall shared with the air chamber.

[0027] In another embodiment, the air chamber is placed in the accommodating cavity as an independent module. In this embodiment: the air chamber includes a bottom wall, a side wall and a top wall, the side wall of the air chamber is abutted against the inner wall of the water tank, and the air outlet holes are opened at corresponding positions on the side wall of the air chamber and the inner wall of the water tank.

[0028] Optionally, the water tank also includes a cover placed on the top of the water tank, the cover is provided with through holes corresponding to the air inlet hole, water inlet hole and water outlet hole, respectively, for passing the corresponding air inlet pipeline, liquid inlet pipeline and plasma activated water output pipeline, and the cover is also provided with an exhaust hole.

[0029] Optionally, a gas pre-ionization device is also included, and the input end of the gas pump is connected to the output end of the gas pre-ionization device through a pipeline.

[0030] Optionally, the gas pre-ionization device is a single-dielectric coaxial dielectric barrier discharge device. The gas pre-ionization device is located outside the water tank. The gas is pre-ionized by the device and then sent into the gas chamber for ionization. The gas is ionized multiple times, which can increase the species and concentration content in the plasma-activated water.

[0031] A gas pre-ionization device is arranged outside the water tank. On the one hand, by filling the gas chamber with pre-ionized plasma gas, the water in the gas chamber is discharged to create a stable gas discharge environment; on the other hand, the species composition and concentration in the plasma-activated water are improved.

[0032] The present application also provides a method for preparing plasma-activated water using the modular plasma-activated water preparation device, comprising:

[0033] Cooling water is added to the cooling water area, and the air pump is started. Gas or pre-ionized gas is sent into the air chamber through the air pump. After the residual gas and / or liquid in the air chamber is exhausted, the raw water supply pump is started to send raw water into the interlayer space. The electrode assembly is started, and the gas in the air chamber generates plasma between the gaps in the dielectric tubes. The activated gas containing plasma in the air chamber forms tiny bubbles through the gas outlet holes and is injected into the raw water in the interlayer space. The gas and liquid are mixed to prepare plasma-activated water. The heat generated during the operation of the electrode assembly is transmitted to the cooling water through the top wall of the air chamber.

[0034] Plasma activated water is output from the plasma activated water output pipeline; excess gas in the gas-liquid mixing area is discharged from the through holes on the inner wall; when the temperature of the cooling water is too high, the supply of raw water can be increased, and excess raw water overflows from the exhaust / water hole into the cooling water to reduce the temperature of the cooling water.

[0035] Optionally, the gas is air or air pre-ionized by plasma.

[0036] Optionally, during the preparation process, the gas flow rate is 15-25 L / min, the liquid flow rate is 1-3 L / min, the pre-ionization power supply power is 80-90 W, the discharge power supply power in the gas chamber is 185-215 W, and the activated water temperature is <40°C; the activation time is 10-40 min.

[0037] Preferably, the gas flow rate is 20 L / min, the liquid flow rate is 2 L / min, the pre-ionization power supply power is 85 W, the discharge power supply power in the gas chamber is 185 W; and the activation time is 30 min.

[0038] The preparation device of the present application can set up multiple air chambers in the same water tank according to the amount of water to be treated, thereby increasing the water treatment capacity; a stable discharge gap is formed by double-dielectric barrier discharge; a multi-array inner wall electrode is set in each air chamber, thereby increasing the discharge area and improving the efficiency of plasma-activated water; the plasma components can be quickly blown out through the small hole air outlet in the longitudinal lower area of ​​the dielectric tube, thereby increasing the gas-liquid mixing efficiency and reducing the loss of plasma components; the pre-ionized plasma is used to improve the species composition and concentration in the plasma-activated water through multiple ionization activation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall appearance and structure of the plasma activated water preparation device of this application.

[0040] Figure 2 for Figure 1 Schematic diagram of the structure of the medium water tank part (without the cover).

[0041] Figure 3This is a schematic diagram of the overall internal structure of the plasma activated water preparation device of the present application.

[0042] Figure 4 for Figure 3 main view.

[0043] Figure 5 for Figure 3 Top view of the .

[0044] Figure 6 This is a graph showing the effects of different activation powers and activation times on the EC of activated water in Example 1.

[0045] Figure 7 This is a graph showing the effects of different activation powers and activation times on the ORP of activated water in Example 1.

[0046] Figure 8 This is a graph showing the effect of different activation powers and activation times on the pH value of activated water in Example 1.

[0047] Fig. 9 This is a graph showing the effect of storage time on the conductivity of activated water under light and light-protection conditions in Example 2.

[0048] Fig.10 This is a graph showing the effect of storage time on the ORP of activated water under illumination and light-protection conditions in Example 2.

[0049] Fig.11 This is a graph showing the effect of storage time on the pH value of activated water under light and light-proof conditions in Example 2.

[0050] Fig.12 This is a graph showing the sterilization results of Escherichia coli at different storage times under light and light-proof conditions in Example 2.

[0051] Figures 1 to 5 The reference numerals shown in the figure are as follows:

[0052] 1. Water tank; 2. Air chamber; 3. Sealing strip; 4. Medium pipe; 5. Exhaust / water hole; 6. Water inlet hole; 7. Water outlet hole; 8. Air inlet hole; 9. Small air outlet hole; 10. Inner wall electrode; 11. Gas-liquid mixing area; 12. Cooling water area, 13. Cover, 14. Through hole, 15. Exhaust hole, 16. Packaging cover. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0055] like Figure 1 and Figure 3 As shown, a modular plasma activated water preparation device includes a water tank 1, a plurality of independent air chambers 2 and a plurality of electrode assemblies. The water tank 1 has a bottom wall and a side wall, and the side wall has a sandwich space surrounded by an inner side wall and an outer side wall, and the sandwich space serves as a gas-liquid mixing area 11. The bottom wall and the inner side wall form a receiving cavity, and a part of the receiving cavity serves as a cooling water area 12. The sandwich space has a water inlet 6 and a water outlet 7. The plurality of independent air chambers 2 are all located in the receiving cavity, and the cooling water area 12 is located above the air chamber 2. The top wall of the air chamber 2 has an air inlet 8, and the side wall of the air chamber 2 has a plurality of air outlet holes 9 connecting the air chamber and the sandwich space. The number of electrode assemblies corresponds to the number of air chambers. A group of electrode assemblies is arranged in each air chamber 2. Each group of electrode assemblies includes a number of parallel dielectric tubes 4 and inner wall electrodes 10 correspondingly arranged in each dielectric tube. The inner wall electrodes 10 in adjacent dielectric tubes 4 serve as high-voltage electrodes and grounding electrodes respectively. The inner wall electrodes 10 in the electrode assembly are always in the dielectric tube 4. The dielectric barrier discharge mode prevents water from contacting the inner wall electrodes 10, improves the safety during high-voltage discharge, and effectively avoids the discharge sparking phenomenon caused by the connection between water and the inner wall electrodes when preparing activated water by underwater discharge. The dielectric tube 4 of the electrode assembly is sealed to penetrate the corresponding air chamber 2 and the interlayer space of the water tanks on both sides of the air chamber, and the dielectric tube 4 is divided into a cooling zone-ionization activation zone-cooling zone, which reduces the heating temperature of the dielectric tube and improves the long-term working stability of the discharge.

[0056] The air inlet 8 of the air chamber 2 is connected to an external air pump (not shown in the figure) through an air inlet pipeline, and the air inlet pipeline is sealed to the air inlet to prevent cooling water from entering the air chamber through the air inlet. The water inlet 6 of the interlayer space is connected to an external raw water supply pump (not shown in the figure) through a liquid inlet pipeline, and the water outlet 7 is connected to a plasma activated water output pipeline (not shown in the figure). Gas or pre-ionized gas is sent into the air chamber 2 through an air pump, and raw water is sent into the interlayer space after exhausting the residual gas and / or liquid in the air chamber. The electrode assembly is started, and the gas in the air chamber 2 generates plasma between the gaps of the medium tube 4. The active gas containing plasma in the air chamber forms tiny bubbles through the air outlet holes 9 and is injected into the raw water in the interlayer space, and is mixed with the raw water to prepare plasma activated water, which is output by the pipeline. The modular air chamber 2 setting can increase the water treatment capacity as needed.

[0057] The air chambers 2 in the water tank 1 are provided in a plurality of ways. Figure 3 and Figure 4 As shown in the figure, the air chamber 2 and the water tank 1 are an integrated structure. In this embodiment, the air chamber is divided by upper and lower partitions fixed to the inner wall of the water tank and arranged horizontally. The air chamber and the water tank share the inner wall of the water tank. At this time, the hollow cavity surrounded by the upper and lower partitions and the inner wall of the corresponding area is the air chamber. The air inlet is located on the upper partition, and the air outlet is opened on the inner wall shared with the air chamber. The cooling water area is located above the air chamber. Heat is transferred to the cooling water area through the top wall of the air chamber to avoid overheating of the medium pipe, improve the stability of plasma ionization, reduce the temperature of the gas-liquid mixing area, and reduce the loss of active ingredients in plasma-activated water.

[0058] In another embodiment, the air chamber can be placed in the accommodating cavity as an independent module. In this embodiment, the air chamber includes a bottom wall, a side wall and a top wall. The side wall of the air chamber is abutted against the inner wall of the water tank. Mounting holes for the medium pipe to pass through are provided at corresponding positions of the side wall of the air chamber and the inner wall of the water tank. The medium pipe passing point is sealed. Small air outlet holes are provided at corresponding positions on the side wall of the air chamber and the inner wall of the water tank.

[0059] The interlayer space of the water tank has a water inlet and a water outlet. In one embodiment, see Figure 2 and Figure 3 The water inlet hole 6 and the water outlet hole 7 are both provided on the inner wall of the water tank 1. The inner wall is also provided with a through hole connecting the interlayer space and the accommodating cavity. The through hole also serves as an exhaust / water hole 5. The liquid inlet pipeline passes through the water inlet hole 6 and is inserted into the gas-liquid mixing area 11. The plasma activated water output pipeline passes through the water outlet hole 7 and is inserted into the bottom of the gas-liquid mixing area. Figure 2 In the embodiment shown, the water inlet and the water outlet are basically located on the same horizontal plane, and the position of the exhaust / water hole can be slightly lower than the water inlet and outlet. The exhaust / water hole 5 can discharge excess gas, and when the temperature of the cooling water area is too high, the water flow in the interlayer space can be discharged from the exhaust / water hole 5 into the cooling water to reduce the temperature of the cooling water by passing excess raw water to the gas-liquid mixing area.

[0060] In some embodiments, the water tank 1 further comprises a cover 13, which is placed on the top of the water tank, and has four through holes, three of which 14 correspond to the air inlet, the water inlet and the water outlet, respectively, and are used to pass the corresponding air inlet pipeline, liquid inlet pipeline and plasma activated water output pipeline, and the other through hole is used as an exhaust hole 15. Excess gas in the gas-liquid mixing area is discharged from the exhaust / water hole 5 and finally discharged from the exhaust hole 15 on the cover.

[0061] In some embodiments, the entire structure of the water tank can be made of acrylic, such as Figures 3 to 5As shown, the transparent structure facilitates observation of the plasma generated between the internal medium tubes and the mixing state when the plasma gas is blown into the gas-liquid mixing area through the gas outlet holes.

[0062] The electrode assembly is a key component for preparing plasma activated water. In each set of electrode assemblies, the dielectric tubes are located on the same horizontal plane and are arranged at equal intervals. The inner wall electrode is set close to the inner wall of the dielectric tube. The length of the inner wall electrode is the length of the dielectric tube in the gas chamber area, and the inner wall electrode is >5mm away from the edge of the gas chamber. The inner wall electrodes in adjacent dielectric tubes are respectively connected to the live wire and the neutral wire of the driving power supply, and a plasma discharge gap is formed between adjacent dielectric tubes. The multi-array arrangement method increases the plasma discharge gap and improves the discharge efficiency. The dielectric tube material can be a barrier material such as quartz and glass, with an outer diameter of 10 and a thickness of 1.5mm. The inner wall electrode can be a conductive material such as aluminum, copper, stainless steel, etc., with a thickness of 0.1mm.

[0063] The medium pipe is sealed at the side wall where it passes through, and the inner wall is sealed conventionally. A sealing strip 3 is set at the outer wall, and the sealing strip is located on the outer side of the through hole of the outer wall. The medium pipe 4 passes through the sealing strip, and the sealing strip and the outer side of the outer wall are sealed and bonded by adhesive to improve the sealing of the water tank and avoid leakage caused by excessive internal pressure or aging of the sealing ring during long-term work.

[0064] The medium tube is an axially through-hole hollow tube, and the electrode is close to the inner wall of the medium tube. The electrode needs to be connected to an external power source through a wire. In some embodiments, a packaging cover 16 is provided at both ends of the medium tube. The packaging cover is detachably fixed to the outer wall of the water tank, and the end cover of the medium tube is arranged in the packaging cover. A through hole is provided on the top of the packaging cover for the wire to pass through. The power source for driving the inner wall electrode can adopt a high-frequency high-voltage power source.

[0065] The small air outlet holes 9 are components for outputting activated gas and forming tiny bubbles, and are preferably arranged in the longitudinal area below the medium tube 4. Preferably, all side walls of the air chamber are provided with small air outlet holes 9, and the bottom of the opening of the small air outlet holes can be flush with the bottom wall of the air chamber, which can prevent water in the gas-liquid mixing area from entering the air chamber and affecting the plasma discharge. The residual liquid and / or gas in the air chamber can be better exhausted before the preparation begins, and the activated gas generated during the preparation can also be better blown into the liquid. The opening diameter of the small air outlet holes is 3 to 4 mm; the spacing between adjacent small air outlet holes 9 is 2 to 3 mm. This arrangement is conducive to quickly blowing the plasma activated gas into the gas-liquid mixing area, forming dense and uniform bubbles to improve the gas-liquid mixing efficiency. In a specific embodiment, the small air outlet holes are set as semicircular holes with a diameter of 3 to 4 mm, the distance between the center lines of adjacent semicircular holes is 5 to 6 mm, and a spacing of 2 to 3 mm is formed between the boundaries of the semicircular holes.

[0066] In some embodiments, the original gas to be ionized, such as air, is blown directly into the air chamber by an air pump; in some embodiments, the pre-ionized gas is blown into the air chamber by an air pump. In this embodiment, the plasma-activated water preparation device also includes a gas pre-ionization device (not shown in the figure), and the input end of the air pump is connected to the output end of the gas pre-ionization device through a pipeline. The plasma pre-ionization device can use a single-medium coaxial dielectric barrier discharge device. The gas pre-ionization device is located outside the water tank, and the gas is pre-ionized by the device and then sent into the air chamber for ionization. The gas is ionized multiple times, which can increase the species and concentration content in the plasma-activated water. On the one hand, by filling the air chamber with pre-ionized plasma gas, the water in the air chamber is discharged to create a stable gas discharge environment; on the other hand, the species composition and concentration in the plasma-activated water are increased.

[0067] The process of preparing plasma activated water PAW using the above device:

[0068] First, install the air chamber 2 and the dielectric tube 4 and the inner wall electrode 10 in the water tank 1, then use an air pump to blow gas into the air chamber 2 through the air inlet pipe through the air inlet hole 7 to discharge the residual liquid and / or residual gas in the air chamber 2, and add the liquid to be activated to the water inlet hole 6 through the liquid pipe by the water pump. When starting to work, the pre-ionized plasma gas is blown into the air chamber 2 through the air inlet hole 7 by the air pump, and the activated gas containing plasma is generated in the gap between the dielectric tubes 4 in the air chamber 2. Under the driving action of the air pump, it quickly passes through the small air outlet hole 9, and the active gas containing plasma forms tiny bubbles and is pumped into the water, so that plasma-activated water is prepared in the gas-liquid mixing area 11.

[0069] Plasma activated water is output from the plasma activated water output pipeline; excess gas in the gas-liquid mixing area is discharged from the through holes on the inner wall; when the temperature of the cooling water is too high, the supply of raw water is increased, and the excess raw water flows out into the cooling water to reduce the temperature of the cooling water.

[0070] During the preparation process, the active gas containing plasma is controlled to be quickly injected into the liquid, while ensuring that no liquid flows back into the gas chamber. Usually, the gas flow rate is controlled at 15-25L / min, the liquid flow rate is controlled at 1-3L / min, the pre-ionization power supply power is controlled at 80-90W, the discharge power supply power in the gas chamber is controlled at 185-215W, and the activated water temperature is controlled at <40°C.

[0071] Example 1

[0072] The above device was used to explore the effects of different activation powers and activation times on the pH, EC, and ORP of plasma-activated water at a gas flow rate of 20L / min and a liquid flow rate of 2L / min, and a PAW with low pH (1.46±0.01), high conductivity EC (4223±163.65μs / cm), and high redox unit ORP (722±3.75mv) was prepared. EC represents conductivity, and the treated raw material solution is deionized water, the conductivity of deionized water is <5μs / cm, and the conductivity after preparation is as high as 4223±163.65μs / cm. The higher the conductivity, the more active components in the plasma discharge are integrated into the water body, which means that the concentration of active ions in the PAW increases, and more active substances are generated.

[0073] The results are as follows Figure 6 to Figure 8 As shown in the figure, when the discharge power in the gas chamber is in the range of 155 to 215 W, the conductivity EC increases with the extension of activation time and can reach 4223 ± 163.65 μs / cm ( Figure 6 ), the high redox unit ORP can reach 722±3.75mv( Figure 7 ), the pH value decreased with the extension of reaction time and dropped to below 2 at 30 min ( Figure 8 ). The NTP 185W in the figure refers to the condition that the discharge power in the gas chamber is 185W, and an 85W pre-ionization device is added outside the water tank, that is, the treatment result after the gas is ionized twice.

[0074] Depend on Figure 6 to Figure 8 The results show that, using the preparation device of the present application, plasma-activated water with excellent physical and chemical properties can be prepared in a short time, and the preparation efficiency is improved while also improving the quality of plasma-activated water. The quality of plasma-activated water is further improved under the condition of increasing pre-ionization.

[0075] Example 2

[0076] The present application also explores the stability of the activated water prepared in Example 1. Specifically, the plasma activated water prepared in Example 1 with a discharge power of 185W and 85W pre-ionization for 30 minutes in the gas chamber is taken to explore the effects of illumination and room temperature storage time on the physical and chemical indicators and bactericidal effect of PAW. The results are as follows: Figures 9 to 12 As shown in Figure 2, the pH value of PAW increased with the increase of storage days ( Fig.11 ), EC value decreased ( Fig. 9 ), ORP value remains basically unchanged ( Fig.10 ); 3 days of illumination had little effect on the physical and chemical indicators of PAW; the bactericidal ability of PAW only slightly decreased after three days of storage ( Fig.12 ), does not affect the use.

[0077] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A modular plasma activated water preparation device, characterized in that: include: A water tank, the water tank having a bottom wall and a side wall, the side wall having an interlayer space surrounded by an inner side wall and an outer side wall, the interlayer space serving as a gas-liquid mixing area, the bottom wall and the inner side wall forming a receiving cavity, a part of the receiving cavity serving as a cooling water area, the interlayer space having a water inlet and a water outlet; A plurality of independent air chambers, wherein the air chambers are located below the cooling water area in the accommodating cavity, the top wall of the air chambers has air inlets, and the side walls of the air chambers have a plurality of air outlet holes connecting the air chambers and the interlayer space; A plurality of groups of electrode assemblies, the electrode assemblies comprising a plurality of dielectric tubes arranged in parallel and inner wall electrodes correspondingly arranged in each dielectric tube, the inner wall electrodes in adjacent dielectric tubes serving as high voltage electrodes and grounding electrodes respectively, each group of electrode assemblies corresponding to one of the gas chambers, the dielectric tubes of the electrode assemblies sealingly passing through the corresponding gas chamber and the interlayer space on both sides of the gas chamber in the area above the gas outlet holes; The air inlet is connected to an external air pump through an air inlet pipeline, the water inlet is connected to an external raw water supply pump through a liquid inlet pipeline, and the water outlet is connected to a plasma activated water output pipeline.

2. The modular plasma activated water preparation device according to claim 1, characterized in that: In each group of electrode assemblies, the dielectric tubes are located in the same horizontal plane and are arranged at equal intervals, and the inner wall electrodes are arranged close to the inner walls of the dielectric tubes; the length of the inner wall electrodes is shorter than the length of the dielectric tubes in the gas chamber area.

3. The modular plasma activated water preparation device according to claim 1, characterized in that: A sealing strip is arranged on the outer wall surface of the outer wall and at the place where the medium tube passes through; both ends of the medium tube are provided with a packaging cover fixed to the outer wall, the exposed end of the medium tube is packaged in the packaging cover, and the packaging cover is provided with a through hole for the wire to pass through.

4. The modular plasma activated water preparation device according to claim 1, characterized in that: The air outlet holes are arranged on all side walls of the air chamber; the bottom of the opening of the air outlet holes is flush with the inner bottom wall of the air chamber; the opening diameter of the air outlet holes is 3 to 4 mm; and the spacing between adjacent air outlet holes is 2 to 3 mm.

5. The modular plasma activated water preparation device according to claim 1, characterized in that: The water inlet and outlet holes are both formed on the inner wall; the inner wall is also provided with a through hole connecting the interlayer space and the accommodating cavity, and the through hole also serves as an exhaust / water hole.

6. The modular plasma activated water preparation device according to claim 1, characterized in that: The air chamber is divided by a horizontal partition sealed and fixed to the inner wall. The air chamber and the accommodating cavity share a portion of the inner wall, and the air outlet hole is arranged on the inner wall shared with the air chamber.

7. The modular plasma activated water preparation device according to claim 1, characterized in that: The air chamber comprises a bottom wall, a side wall and a top wall. The side wall of the air chamber is abutted against the inner wall of the water tank. The air outlet holes are provided at corresponding positions on the side wall of the air chamber and the inner wall of the water tank.

8. The modular plasma activated water preparation device according to claim 1, characterized in that: The water tank also includes a cover placed on the top of the water tank, and the cover is provided with through holes corresponding to the air inlet hole, the water inlet hole and the water outlet hole, respectively, for passing the corresponding air inlet pipeline, the liquid inlet pipeline and the plasma activated water output pipeline, and the cover is also provided with an exhaust hole.

9. The modular plasma activated water preparation device according to claim 1, characterized in that: It also includes a gas pre-ionization device, and the input end of the gas pump is connected to the output end of the gas pre-ionization device through a pipeline.

10. A method for preparing plasma-activated water using the modular plasma-activated water preparation device according to claim 1, characterized in that: include: Cooling water is added to the cooling water area, and the air pump is started. Gas or pre-ionized gas is sent into the air chamber through the air pump. After the residual gas and / or liquid in the air chamber is exhausted, the raw water supply pump is started to send raw water into the interlayer space. The electrode assembly is started, and the gas in the air chamber generates plasma between the gaps in the dielectric tubes. The activated gas containing plasma in the air chamber forms tiny bubbles through the gas outlet holes and is injected into the raw water in the interlayer space. The gas and liquid are mixed to prepare plasma-activated water. The heat generated during the operation of the electrode assembly is transmitted to the cooling water through the top wall of the air chamber.

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