Atmospheric pressure plasma jet device for continuous treatment of grains

Abstract

The application discloses an atmospheric pressure plasma jet device for continuous treatment of grains, which comprises a shell, one end of the shell is provided with a feeding port, the other end is provided with a discharging port and an air outlet; a grain conveying and impurity removing unit, an atmospheric pressure plasma jet unit and a grain collecting unit are sequentially arranged in the shell; the atmospheric pressure plasma jet unit comprises two atmospheric pressure plasma jet devices which are identical in structure and can alternately operate, the top of the atmospheric pressure plasma jet unit is communicated with the outside, and a conveying belt is arranged below the two atmospheric pressure plasma jet devices; one end of the grain conveying and impurity removing unit is connected with the bottom discharging end of the feeding port, the other end is connected with one end of the conveying belt, and the other end of the conveying belt is connected with the discharging port. The application has reasonable structure, and can effectively solve the technical problems that the existing device is not uniform and stable in plasma discharge, is complicated in operation, is poor in treatment safety and cannot realize integrated continuous treatment.

Description

Technical Field

[0001] This invention belongs to the field of plasma equipment technology, and relates to an atmospheric pressure plasma jet device, specifically an atmospheric pressure plasma jet device for continuous grain processing. Background Technology

[0002] Plasma is the fourth state of matter, a collection of high-energy particles with extraordinary chemical activity. It possesses characteristics such as extremely high reactivity, non-selectivity in its action on target substances, and no environmental residue. Low-temperature plasma technology, due to its rapid, efficient, and pollution-free characteristics, is increasingly being used for food sterilization, virus inhibition, preservation, insect control, and degradation of pesticide residues. For many years, researchers have experimented with using various discharge methods to generate plasma to remove pesticide residues and fungal contamination. Plasma removal of surface contaminants from grains primarily relies on reactive species such as hydroxyl radicals, superoxide radicals, and singlet oxygen generated by plasma discharge to break chemical bonds in contaminants, including phosphorus-oxygen double bonds, phosphorus-sulfur double bonds, carbon-carbon double bonds, carbon-oxygen double bonds, carbon-nitrogen bonds, benzene rings, and heterocyclic rings. It also etches microbial cells, causing cell rupture, DNA breakage, and leakage of contents, achieving efficient degradation of organic pollutants and inactivation of microorganisms. Furthermore, plasma can promote grain germination, etch the seed coat, accelerate water absorption, break seed dormancy, increase seed photosensitivity, and influence and prematurely initiate physiological and biochemical processes related to seed germination, stimulating physiologically active substances. Applying both visible and ultraviolet light to seeds can induce energy transitions in the seed's biomolecules, which is beneficial for improving seed germination potential and generating stress resistance.

[0003] In summary, plasma treatment of grains can avoid the defects of traditional chemical and biological soaking methods, and avoid the negative effects of chemical and biological reagents and subsequent application of fertilizers and pesticides on the farmland environment, which is of great significance for the sustainable use of agricultural resources.

[0004] However, existing plasma processing equipment has some defects, such as a small plasma range, uneven and unstable discharge, plasma generation within gaps, low degree of modularity in multi-part integration, cumbersome operation, and poor safety. Therefore, it is difficult to achieve integrated and continuous processing of grains using such equipment. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide an atmospheric pressure plasma jet device for continuous grain processing, which can effectively solve the technical problems of uneven and unstable plasma discharge, cumbersome operation, poor processing safety and inability to achieve integrated continuous processing in existing devices.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention discloses an atmospheric pressure plasma jet device for continuous grain processing, comprising a housing, with a feed inlet at one end and a discharge outlet and an air outlet at the other end; inside the housing, a grain conveying and impurity removal unit, an atmospheric plasma jet unit, and a grain collection unit are arranged in sequence.

[0008] The atmospheric plasma jet unit includes two identical atmospheric plasma jet devices that can operate alternately. The top of the devices is connected to the outside world, and a conveyor belt is provided below the two atmospheric plasma jet devices.

[0009] One end of the grain conveying and impurity removal unit is connected to the bottom discharge end of the inlet, and the other end is connected to one end of the conveyor belt, with the other end of the conveyor belt connected to the discharge outlet.

[0010] Preferably, the atmospheric plasma jet device is composed of a plurality of jet dischargers evenly arranged;

[0011] Each jet discharger includes a columnar quartz glass shell and a high-voltage electrode rod disposed therein; the upper end of the high-voltage electrode rod extends out of the top of the columnar quartz glass shell and is fixed to a steel plate, serving as the high-voltage electrode of the jet discharger; the lower end of the high-voltage electrode rod passes through a perforated copper plate disposed inside the columnar quartz glass shell, serving as the low-voltage electrode of the jet discharger for connection to electricity, and the high-voltage electrode rod is covered with insulating material.

[0012] More preferably, each atmospheric plasma jet device is provided with a gas container at the top, and an air inlet communicating with the outside is opened above the gas container. The bottom of the atmospheric plasma jet device is fixed to a support frame inside the shell by a support plate.

[0013] More preferably, each atmospheric plasma jet device consists of 100 jet dischargers evenly arranged, and the high-voltage electrode rods of the 100 jet discharge structures are welded onto a steel plate; the irradiation radius of a single jet discharge structure is 25 mm, and the discharge area is 0.5 m long and 0.5 m wide.

[0014] More preferably, the top of the columnar quartz glass shell has an opening, and the bottom has a conical nozzle, with the distance between the conical nozzle and the conveyor belt being 15-25 mm.

[0015] More preferably, the columnar quartz glass shell is also coated with polyvinyl chloride.

[0016] Preferably, the grain conveying and impurity removal unit includes a vibrating screen, which is inclined and has two spring structures, one high and one low, at both ends of the bottom of the vibrating screen. A vibrating motor is connected between the two spring structures, and an impurity discharge port is provided below the vibrating screen for collecting impurities.

[0017] More preferably, a baffle and a grain interface are provided between the vibrating screen and the conveyor belt. When the baffle is open, the grain processed by the vibrating screen is stacked through the grain interface and then enters the conveyor belt.

[0018] Preferably, the conveyor belt is a belt-type conveyor belt, 0.5m wide, and made of corrosion-resistant insulating material; baffles are provided on both sides of the conveyor belt, and electrodes are provided at the bottom, with an electrode power of 0.37KW.

[0019] Preferably, the distance between the two atmospheric plasma jet devices is 0.3 to 0.5 m, and they are connected by a rectangular steel fixed to the shell. A timing device is used to control the two atmospheric plasma jet devices to operate alternately.

[0020] More preferably, the start time of the first atmospheric plasma jet device is set to 0 min, 300 min, ..., i.e., 300*n minutes, where n is a positive integer;

[0021] The second atmospheric plasma jet device started operating at 150.8 min, 450.8 min, ..., i.e., 150.8 + 300 * n minutes, where n is a positive integer.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The atmospheric pressure plasma jet device for continuous grain processing disclosed in this invention involves feeding grain seeds through an inlet. After being screened and impurity removed by a grain conveying and impurity removal unit, the grain seeds enter a special interface and are conveyed by a conveyor belt into an atmospheric plasma jet unit. The plasma atmosphere generated in the discharge zone of the atmospheric plasma jet unit jets the grain seeds. The advantages are as follows:

[0024] On the one hand, the superior treatment effect is evident in the atmospheric plasma jet unit, which utilizes atmospheric pressure plasma jet discharge. Composed of two identical atmospheric plasma jet devices that operate alternately, the generated plasma reaches the grain surface, offering advantages such as high energy-carrying particle density, low medium temperature, and cost-effectiveness. Furthermore, the plasma generated by atmospheric pressure plasma jet discharge is not confined to gaps but can exist in open spaces, ensuring uniform and thorough treatment of grain seeds. To avoid efficiency losses caused by continuous discharge heat generation in the discharge reactors and to prevent affecting the treatment effect, the two reactors are set to alternately start and discharge at set times, resulting in a high degree of automation. On the other hand, the design is rational and highly stable. The gaps between individual jet devices are set according to their effective radiation radius, maximizing the function of each device. The entire equipment is enclosed in a shell, achieving a sealed environment to prevent plasma leakage and effectively maintain plasma gas density. Therefore, the integrated equipment of the present invention can fully guarantee the processing capacity of grains. According to calculations, taking wheat as an example, for medium-grained wheat seeds with a bulk density of 286g / L and a processing capacity of 3mm, the processing capacity can reach 73L / h (0.02L / s), and the daily processing capacity can reach 500kg.

[0025] Furthermore, it is highly safe. Inside the atmospheric pressure plasma jet discharge device, each jet device has insulating rubber on the outside of its high-voltage electrode, and the columnar quartz glass shell is also wrapped with polyvinyl chloride plastic, making the start-up process very safe.

[0026] Furthermore, the use of vibrating screens can remove impurities from grain seeds or grains, as well as the bran of grains, increasing the direct contact area between the grains and the plasma, and improving the processing effect.

[0027] Furthermore, the grain interface design effectively organizes the grains and prevents them from piling up. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the plasma device for continuous grain processing according to the present invention;

[0029] Figure 2 This is a top view of the plasma device for continuous grain processing according to the present invention;

[0030] Figure 3 This is a front view of the plasma device for continuous grain processing according to the present invention;

[0031] Figure 4 A cross-sectional view of a single jet device;

[0032] Figure 5 This is a cross-sectional view showing the connection between the grain inlet and the conveyor belt.

[0033] Wherein: 1 is the feed inlet; 2 is the shell; 3 is the vibrating screen; 4 is the baffle; 5 is the grain interface; 6 is the atmospheric pressure plasma jet device; 7 is the rectangular steel; 8 is the spring; 9 is the vibrating motor; 10 is the impurity outlet; 11 is the electrode; 12 is the conveyor belt; 13 is the air outlet; 14 is the wheat outlet; 15 is the high-voltage electrode; 16 is the insulating rubber layer; 17 is the perforated copper plate; 18 is the columnar quartz glass shell; 19 is the air inlet; 20 is the steel plate; 21 is the fixing frame; 22 is the gas container. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] The present invention will now be described in further detail with reference to the accompanying drawings:

[0037] See Figure 1 The atmospheric pressure plasma jet device for continuous grain processing disclosed in this invention includes a housing 2, with an inlet 1 at one end and an outlet 14 at the other end; a grain conveying and impurity removal unit, an atmospheric plasma jet unit and a grain collection unit are arranged sequentially inside the housing 2.

[0038] The atmospheric plasma jet unit includes two identical atmospheric plasma jet devices 6 that can operate alternately, with their tops connected to the outside world, and a conveyor belt 12 located below the two atmospheric plasma jet devices 6.

[0039] One end of the grain conveying and impurity removal unit is connected to the bottom discharge end of the feed inlet 1, and the other end is connected to one end of the conveyor belt 12. The other end of the conveyor belt 12 is connected to the discharge outlet 14 and the air outlet 13.

[0040] Preferably, the conveyor belt 12 is a belt-type conveyor belt, 0.5m wide, and made of corrosion-resistant insulating material. Baffles, 5cm high, are provided on both sides of the conveyor belt 12. The actual speed of the conveyor belt 12 is 0.0167m / s to avoid loss of actual working efficiency.

[0041] More preferably, the selected transmission belt electrode power is 0.37KW.

[0042] More preferably, the feed inlet 1 has a size of 50×500mm and is made of galvanized steel sheet.

[0043] More preferably, the shell 2 is a rectangular shell, made of 6mm thick Q235B carbon steel plate, and galvanized on one side with a zinc plating thickness of 0.0143mm and a zinc plating amount of 200g / cm². 2 .

[0044] Preferably, the grain conveying and impurity removal unit includes a vibrating screen 3, which is inclined. Two spring structures 8, one high and one low, are located at both ends of the bottom of the vibrating screen 3, and a vibrating motor 9 is connected between the two spring structures 8. An impurity discharge port 10 is also located below the vibrating screen 3 for collecting impurities. During the conveying process in this unit, the grain is vibrated by the vibrating motor 9, and impurities fall through the screen holes of the vibrating screen and are discharged through the impurity discharge port 10.

[0045] More preferably, the vibrating screen has a mesh size of 10, a length of 0.8m, a width of 0.5m, a length of 0.5m, an inclination angle of 10°, and the selected vibrating machine model is XZDA10-6 with a power of 0.75KW.

[0046] Preferably, see Figure 5 A baffle 4 and a grain inlet 5 are provided between the vibrating screen 3 and the conveyor belt 12. When the baffle 4 is open, the grain processed by the vibrating screen 3 is stacked through the grain inlet 5 and enters the conveyor belt 12. The grain inlet 5 is similar to a table-shaped buckle, which is locked at the connection point. The height of the buckle can be 1.5 times the height of the grain. This ensures that only one layer of grain enters the conveyor belt 12, and there will be no stacking. The purpose of this structure is mainly to level and organize the grain. Taking wheat as an example, for medium-grain wheat seeds with a grain size of 3mm, a design of 50cm long, 0.5m wide, and 5mm high is provided, connecting the vibrating screen 3 and the conveyor belt 12.

[0047] The specific structure of the atmospheric plasma jet device 6 is shown in the figure. Figure 2 and Figure 3The atmospheric plasma jet device 6 is equipped with a gas container 22 at the top, and an air inlet 19 communicating with the outside is opened above the gas container 22. The bottom of the atmospheric plasma jet device 6 is fixed to the support frame inside the shell 2 by a support plate 21.

[0048] Preferably, the atmospheric plasma jet device 6 is composed of a plurality of jet dischargers evenly arranged.

[0049] In a preferred embodiment, the system comprises 100 jet dischargers, each with an irradiation radius of 25 mm. The discharge area is 0.5 m long and 0.5 m wide.

[0050] See Figure 4 Each jet discharger includes a columnar quartz glass shell 18 and a high-voltage electrode rod 15 disposed therein; the upper end of the high-voltage electrode rod 15 extends out of the top of the columnar quartz glass shell 18 and is fixed to the steel plate 20, serving as the high-voltage electrode of the jet discharge structure; the lower end of the high-voltage electrode rod 15 passes through a perforated copper plate 17 disposed inside the columnar quartz glass shell 18, serving as the low-voltage electrode of the jet discharge structure and connected to electricity, and the high-voltage electrode rod 15 is covered with an insulating material 16.

[0051] Furthermore, the high-voltage electrode rod 15 is a steel rod with a diameter of 3 mm and a length of 18 cm. The high-voltage electrode rod 15 is wrapped with an insulating material 16 with a diameter of 6 mm. Optionally, the insulating material 16 is made of rubber, and a perforated copper plate 17 with a thickness of 20 mm is provided at the bottom of the columnar quartz glass shell 18 as a grounding low-voltage electrode.

[0052] Therefore, in the preferred embodiment, the atmospheric plasma jet device 6 uses a 10mm thick steel plate 20 to connect 100 high-voltage electrode rods 15 of the jet dischargers, and then connects them to a power source. That is, the 100 steel rods are welded onto the steel plate 20. A perforated copper plate 17, 20mm thick, is provided at the bottom of the interior of the columnar quartz glass housing 18, serving as a grounding electrode for the low-voltage electrodes.

[0053] The two atmospheric plasma jet devices 6 are 0.3–0.5 m apart and connected by a rectangular steel 7 fixed to the housing 2. A timing device controls the alternating operation of the two atmospheric plasma jet devices 6. The starting times of the first atmospheric plasma jet device 6 are set sequentially to 0 min, 300 min, ..., 300*n minutes, where n is a positive integer; the starting times of the second atmospheric plasma jet device 6 are set sequentially to 150.8 min, 450.8 min, ..., 150.8 + 300*n minutes, where n is a positive integer. This ensures that each grain seed is treated for 30 seconds.

[0054] The working principle of the atmospheric pressure plasma jet device for continuous grain processing described above in this invention is described below using wheat seed processing as an example:

[0055] The specific startup process is as follows: Wheat seeds are fed into the device through inlet 1. After impurities are removed by a vibrating screen 3 (0.5m long and 0.5m wide), the baffle 4 is opened, and the wheat seeds are stacked flat at the grain interface 5. Then, they are conveyed by a 0.5m wide conveyor belt 12 to the radiation range of the atmospheric pressure plasma jet device 6, achieving plasma jet treatment of the wheat. The two atmospheric pressure plasma jet devices 6 are turned on alternately at regular intervals to avoid energy loss caused by prolonged discharge and heat generation. The first atmospheric pressure plasma jet device is turned on at 300*n minutes, and the second atmospheric pressure plasma jet device 6 is turned on at 150.8+300*n minutes (n is a positive integer), ensuring a processing time of 30 seconds for each wheat grain.

[0056] In a preferred embodiment of the present invention, the device is connected to an AC power supply with an output frequency of 5-20 kHz. The high-voltage electrode is a steel plate (cylindrical in shape, 1-3 mm in diameter) connected to the central steel rod of each individual jet reactor and connected to the AC power supply. Insulating rubber is wrapped around the outside of each high-voltage electrode rod. The low-voltage electrode is a perforated copper plate, 0.5 m × 0.5 m in size. Each columnar quartz glass shell 18 is externally wrapped with polyvinyl chloride (PVC) to improve safety and facilitate observation of the discharge phenomenon and adjustment of discharge parameters.

[0057] The plasma jet generated by the atmospheric pressure plasma jet device can directly act on the wheat on the conveyor belt below. At this time, the plasma is rich in active substances and has extremely high activity, mainly including hydroxyl radicals, superoxide radicals, singlet oxygen, etc., which can react with chemical bonds such as P=O, P=S, C=C, C=O, CN, benzene rings, and heterocycles in pesticide molecules, breaking them down, thereby achieving the effect of degrading pesticide residues.

[0058] This invention is used for continuous processing of wheat seeds. When in use:

[0059] Wheat enters the equipment through the feed inlet, first passing through a vibrating screen to remove impurities. Then, it passes through a special interface to level the grains before entering the conveyor belt. On the conveyor belt, it undergoes plasma treatment for 30 seconds using a discharge device, and finally exits through the discharge outlet. The conical nozzle is 20mm away from the conveyor belt. The working gas is argon, with a flow rate of 4L / min. Based on comprehensive design considerations, the processing capacity is 500kg / day.

[0060] The following application verification was carried out by selecting wheat that had been treated with cypermethrin, chlorpyrifos, and carbaryl, respectively.

[0061] Wheat seeds were soaked in solutions of 0.8 mg / kg cypermethrin, 2 mg / kg chlorpyrifos, and 2 mg / kg carbaryl, respectively, and then placed into the apparatus described in this invention. The argon gas flow rate was adjusted to 4 L / min, and the input voltage was adjusted to 110, 120, 130, 140, 150, and 160 V. The residues and degradation rates of cypermethrin, chlorpyrifos, and carbaryl under different input voltages were measured, as shown in Table 1.

[0062] Table 1. Pesticide residues on wheat surface after treatment with the device.

[0063]

[0064]

[0065] The nutritional quality indicators of wheat in the 150V treatment group were determined, as shown in Table 2:

[0066] Table 2 Nutritional quality of wheat under 150V treatment

[0067]

[0068] As shown in Tables 1 and 2, this invention effectively removes cypermethrin, chlorpyrifos, and carbaryl from the surface of wheat seeds at input power ranging from 110 to 160V. It has little impact on the nutritional quality indicators of wheat, and all values ​​remain within the range required by national standards or best-before-eaten standards.

[0069] In summary, the atmospheric pressure plasma jet apparatus for continuous grain processing described in the above embodiments of the present invention has the following advantages:

[0070] 1. The vibrating screen can remove impurities from wheat seeds or grains, as well as wheat bran, increasing the direct contact area between the wheat and the plasma and improving the processing effect. The designed grain interface can organize the wheat and prevent the grains from piling up.

[0071] 2. The discharge system employs atmospheric pressure plasma jet discharge, consisting of two concentric electrodes (a high-voltage electrode composed of electrode rods and a low-voltage electrode composed of perforated copper plates). Gas flows between the two electrodes, and a high voltage is applied between them, causing gas ionization. The generated plasma reaches the wheat surface through a conical nozzle. It offers advantages such as high energy-carrying particle density, low dielectric temperature, and cost-effectiveness.

[0072] 3. Excellent treatment effect. The plasma generated by atmospheric pressure plasma jet discharge is not confined to the gap and can exist in open space, which has the advantages of uniform spatial distribution and thorough treatment of wheat grains. In order to avoid the efficiency loss caused by continuous discharge heat generation in the discharge reactor and to prevent affecting the treatment effect, two reactors are set to be turned on and off at timed intervals, resulting in a high degree of automation.

[0073] 4. The design is reasonable and highly stable. The gap between individual jet devices is set according to the effective radiation radius of the jet device, maximizing the function of each device. The entire equipment is encased in a carbon steel shell to achieve a sealed environment, prevent plasma loss, and effectively ensure the plasma gas density.

[0074] 5. High safety: Inside the atmospheric pressure plasma jet discharge device, each jet device's high-voltage electrode is equipped with insulating rubber, and the entire container's outer wall is also wrapped with polyvinyl chloride plastic, making the startup process very safe.

[0075] 6. High processing capacity. For medium-grained wheat seeds of 3mm with a bulk density of 286g / L, the processing capacity can reach 73L / h (0.02L / s), and the daily processing capacity can reach 500kg.

[0076] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An atmospheric pressure plasma jet device for continuous grain processing, characterized in that, Includes a shell (2), one end of which is provided with a feed inlet (1), and the other end is provided with a discharge outlet (14) and an air outlet (13); inside the shell (2) are arranged a grain conveying and impurity removal unit, an atmospheric plasma jet unit and a grain collection unit in sequence; The atmospheric plasma jet unit includes two identical atmospheric plasma jet devices (6) that can operate alternately, with their tops connected to the outside. A conveyor belt (12) is provided below the two atmospheric plasma jet devices (6). The atmospheric plasma jet device (6) is composed of several jet dischargers evenly arranged. Each jet discharger includes a columnar quartz glass shell (18) and a high-voltage electrode rod (15) disposed therein. The upper end of the high-voltage electrode rod (15) extends out from the top of the columnar quartz glass shell (18). The high-voltage electrode of the jet discharger is fixed to the steel plate (20); the bottom end of the high-voltage electrode rod (15) passes through the perforated copper plate (17) set inside the columnar quartz glass shell (18) and is connected to the low-voltage electrode of the jet discharger. The high-voltage electrode rod (15) is covered with insulating material (16); the distance between the two atmospheric plasma jet devices (6) is 0.3~0.5m, and they are connected by a rectangular steel (7) fixed on the shell (2). The timing device is used to control the two atmospheric plasma jet devices (6) to run alternately. One end of the grain conveying and impurity removal unit is connected to the bottom discharge end of the feed inlet (1), and the other end is connected to one end of the conveyor belt (12), and the other end of the conveyor belt (12) is connected to the discharge outlet (14). The grain conveying and impurity removal unit includes a vibrating screen (3), one end of which is connected to the bottom discharge end of the feed inlet (1), and the other end of the vibrating screen (3) is provided with a grain interface (5) between it and one end of the conveyor belt (12). The grain interface (5) is used to sort the grain to prevent the grain from piling up on the conveyor belt (12). The other end of the conveyor belt (12) is connected to the discharge port (14). The starting times for the first atmospheric plasma jet device (6) are set to 0 min, 300 min, ..., i.e., 300 min. n minutes, where n is a positive integer; The second atmospheric plasma jet device (6) started operating at 150.8 min, 450.8 min, ..., i.e., 150.8 + 300 min. n minutes, where n is a positive integer.

2. The atmospheric pressure plasma jet device for continuous grain processing according to claim 1, characterized in that, The atmospheric plasma jet device (6) has a gas container (22) on top, and an air inlet (19) connected to the outside is opened above the gas container (22). The bottom of the atmospheric plasma jet device (6) is fixed to the support frame inside the shell (2) by a support plate (21).

3. The atmospheric pressure plasma jet device for continuous grain processing according to claim 1, characterized in that, The atmospheric plasma jet device (6) consists of 100 jet dischargers arranged evenly, with the high-voltage electrode rods (15) of the 100 jet dischargers welded onto the steel plate (20); the irradiation radius of a single jet discharger is 25 mm, and the discharge area is 0.5 m long and 0.5 m wide.

4. The atmospheric pressure plasma jet device for continuous grain processing according to claim 1, characterized in that, The top of the columnar quartz glass shell (18) is open and the bottom is a conical nozzle, with the distance between the conical nozzle and the conveyor belt being 15~25 mm.

5. The atmospheric pressure plasma jet device for continuous grain processing according to claim 1, characterized in that, The vibrating screen (3) is inclined and has two spring structures (8) at the bottom ends of the vibrating screen (3), one high and one low. A vibrating motor (9) is connected between the two spring structures (8). An impurity outlet (10) is also provided below the vibrating screen (3) for collecting impurities.

6. The atmospheric pressure plasma jet device for continuous grain processing according to claim 5, characterized in that, A baffle (4) is provided between the vibrating screen (3) and the conveyor belt (12). When the baffle (4) is opened, the grain processed by the vibrating screen (3) enters the conveyor belt (12) through the grain interface (5).

7. The atmospheric pressure plasma jet device for continuous grain processing according to claim 1, characterized in that, The conveyor belt (12) is a belt-type conveyor belt with a width of 0.5m, made of corrosion-resistant insulating material; baffles are provided on both sides of the conveyor belt (12), and electrodes (11) are provided at the bottom. The electrode power of the conveyor belt (12) is 0.37KW.

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