Industrial-grade plasma deodorization system

Abstract

The invention relates to the technical field of plasma deodorization, and discloses an industrial-grade plasma deodorization system, one or more plasma racks are arranged in a box body of plasma deodorization equipment, and a plurality of plasma generation units are arranged in the plasma racks in an array manner; wherein the plasma generating unit comprises a high electrode and a low electrode, the high electrode is of an annular structure and is arranged on the periphery of the low electrode in a surrounding mode, and a gap is reserved between the low electrode and the high electrode. Therefore, a plurality of double-medium plasma generation units formed by coaxial high electrodes and low electrodes which are arranged in a whole column are arranged, and all the units are connected in parallel through a busbar so as to supply power in a unified manner; based on the structure, the power consumption required by large-scale deodorization systems such as an industrial-grade plasma deodorization system is greatly reduced, and the plurality of unitized plasma generation units can ionize air in each region, so that the deodorization effect can be kept even improved while lower power consumption is kept.

Description

Technical Field

[0001] The present application relates to the field of plasma deodorization technology, and in particular to an industrial-grade plasma deodorization system. Background Art

[0002] In the existing technology, high-energy ions are used for air purification technology. A plasma generator is used to generate plasma in a certain area. The plasma can quickly oxidize the odor molecules in the odorous gas, for example, decomposing methyl mercaptan, ammonia, and hydrogen sulfide in industrial waste gas.

[0003] With the development of technology, more effective deodorization systems such as high-energy plasma pulse deodorization systems and dual-medium low-temperature plasma deodorization systems have emerged. Among them, the dual-dielectric plasma technology (Double Dielectric Barrier Discharge, DDBD) inserts two layers of insulating media (such as quartz glass, ceramics, etc.) between two electrodes to ionize the gas under the action of a high-frequency and high-voltage electric field to form a low-temperature plasma. This discharge method avoids direct contact between the electrode and the gas, thereby preventing electrode corrosion and spark discharge, and improving the stability and safety of the system. In addition, the plasma generated by the dual-medium plasma technology has a high density and a large concentration of active particles. It can react quickly with pollutants and has high treatment efficiency. It is favored by major manufacturers, and many dual-medium low-temperature plasma deodorization systems have also appeared on the market.

[0004] It can be seen that the existing various dual-media low-temperature plasma deodorization systems have lower energy consumption and better deodorization effects than traditional plasma deodorization systems, but there is still room for improvement. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to propose an industrial-grade plasma deodorization system that can further reduce energy consumption while maintaining or even improving the deodorization effect based on the existing dual-medium low-temperature plasma deodorization system.

[0006] The present application provides an industrial-grade plasma deodorization system comprising a spray tower, an induced draft fan, and a plasma deodorization device, which are interconnected in sequence. The induced draft fan introduces odor from the spray tower into the plasma deodorization device. The plasma deodorization device comprises a housing and an electrical control box. The housing is configured with an air inlet and an air outlet. The induced draft fan delivers gas from the air inlet into the housing. The housing is provided with one or more plasma racks, and a plurality of plasma generating units are arranged in an array within the plasma racks. The plasma generating units include a high electrode and a low electrode, the high electrode being constructed in an annular structure and surrounding the low electrode, with a gap between the low electrode and the high electrode, and the axis direction of the high and low electrodes being aligned with the direction from the air inlet to the air outlet. The electrical control box is electrically connected to the plasma unit rack and is connected to a high-voltage power supply.

[0007] The effect is that: by setting up a number of dual-medium plasma generating units formed by coaxial high electrode stages and low electrodes arranged in a row, and connecting the units in parallel through a busbar to uniformly supply power; based on the above structure, the power consumption required for large deodorization systems such as industrial-grade plasma deodorization systems is greatly reduced, and the unitized plasma generating units can ionize the air in various areas, which can maintain or even improve the deodorization effect while maintaining lower power consumption.

[0008] Furthermore, the plasma deodorization equipment also includes a pretreatment unit rack arranged in the box body; the pretreatment unit rack is arranged between the air inlet and the plasma rack, and a plurality of pretreatment tubes arranged in an array are arranged in the pretreatment unit rack, and the axial direction of the pretreatment tube is along the air inlet toward the air outlet, and the pretreatment tube is filled with water-absorbing material.

[0009] Furthermore, the plasma deodorization equipment also includes a filter screen arranged in the box body, and the filter screen includes a plurality of filters arranged in parallel in sequence along the thickness direction and arranged between the pre-treatment unit frame and the air inlet.

[0010] Furthermore, the plasma rack includes a frame and the plasma generating unit arranged in the frame; the frame includes a first sub-frame and a second sub-frame, the first sub-frame and the second sub-frame are arranged on both sides of the plasma rack in the thickness direction, and a lead frame is arranged between the first sub-frame and the second sub-frame; a first circuit connected to the high electrode and a second circuit connected to the low electrode are arranged in the lead frame, and the first circuit and the second circuit are both connected to the electric control box.

[0011] Furthermore, the high electrode is constructed as a hollow cylinder, the inner and outer walls of the hollow cylinder are covered with a dielectric layer, and the low electrode is a solid cylinder, which is located at the center of the hollow cylinder of the high electrode, so that the distance between the low electrode and the high electrode in each area is consistent.

[0012] Furthermore, the radius ratio b / a of the upper electrode and the lower electrode is between 1.5 and 2.5, the dielectric layer is a ceramic dielectric layer with a dielectric constant ε≥8, and the thickness of the dielectric layer is 0.5 mm to 1.2 mm.

[0013] Furthermore, the dielectric layer includes a first dielectric layer wrapped around the outer periphery of the high electrode and a second dielectric layer wrapped around the inner periphery; the first dielectric layer is a high dielectric constant ferroelectric ceramic, and the second dielectric layer is a ceramic oxide film.

[0014] Furthermore, the high electrode is constructed as a conical hollow body, with a large diameter section of the conical hollow body facing the air inlet and a small diameter section facing the air outlet.

[0015] Furthermore, the high electrode and the low electrode form a coaxial cylindrical capacitor; the electrical control box is provided with an energy recovery module, and the energy recovery module includes: an energy storage capacitor group connected in parallel with the high electrode and the low electrode, the energy storage capacitor group forms an LC oscillation circuit with the coaxial cylindrical capacitor through a high-frequency inductor; a bidirectional resonant rectifier bridge, including four groups of diodes connected in a full-bridge topology, and the input end is connected across the two ends of the energy storage capacitor group; a flyback voltage conversion module, the primary winding of which is connected to the output end of the bidirectional resonant rectifier bridge, and the secondary winding is connected back to the high-voltage power bus through a rectifier and filter unit.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic structural diagram of a plasma deodorization device according to some embodiments of the present application;

[0019] Figure 2 is a side view of a plasma deodorization device according to some embodiments of the present application;

[0020] Figure 3 yes Figure 2 Section view of midline AA;

[0021] Figure 4is a schematic diagram of a plasma rack explosion structure according to some embodiments of the present application;

[0022] Figure 5 This is a schematic diagram of the structure of a plasma generating unit according to an embodiment of the present application.

[0023] Reference numerals:

[0024] 100-Plasma deodorization equipment;

[0025] 110 - box, 120 - plasma rack, 121 - plasma generating unit, 122 - frame, 1221 - first sub-frame, 1222 - second sub-frame, 123 - lead frame, 130 - pre-treatment unit frame, 131 - pre-treatment tube, 140 - filter, 141 - first filter, 142 - second filter

[0026] 11-upper electrode, 12-lower electrode, 13-first dielectric layer, 14-second dielectric layer;

[0027] a-air inlet, b-air outlet. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0031] In the description of this application, “plurality” means two or more.

[0032] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0033] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0034] In the prior art, the dual-medium plasma deodorization device 100 generates high-density, low-temperature plasma through dual-dielectric barrier discharge technology (DDBD) to achieve efficient deodorization; however, the low-temperature plasma generated by the dual-dielectric barrier discharge technology has a high density, which is 1,500 times that of corona discharge, and requires more energy to maintain its generation and stability; moreover, the existing dual-medium plasma deodorization device 100 is often equipped with multiple pairs of plate structures, and each plate requires an independent power supply, resulting in a total power consumption of the device.

[0035] Typically, the power of dual-media plasma deodorization equipment 100 used for industrial-grade odor treatment on the market ranges from a few kilowatts, with some even exceeding 4,000W. For industrial manufacturers, their energy consumption is a significant cost expense.

[0036] Reference below Figure 1-Figure 5 , describing various embodiments of the present application.

[0037] The industrial-grade plasma deodorization system disclosed in the embodiments of this application includes a spray tower (not shown), an induced draft fan (not shown), and a plasma deodorization device 100, which are connected in sequence. The induced draft fan introduces odor from the spray tower into the plasma deodorization device 100. The spray tower pre-treats industrial waste gas by removing impurities such as particulate matter, soluble harmful gases, and some volatile organic compounds from the waste gas through a spray device and a suitable filler layer with a specific absorbent liquid; the induced draft fan is used to drive air flow. In different embodiments, UV photolysis purifiers, activated carbon adsorption towers, etc. may also be included, and the specific structure is not detailed here.

[0038] Next, the plasma deodorization device 100 in the embodiment of the present application is described. The plasma deodorization device 100 includes a housing 110 and an electric control box (not shown in the figure) arranged next to the housing 110 .

[0039] refer to Figure 1-Figure 3As shown, the housing 110 is constructed with an air inlet a and an air outlet b. The induced draft fan delivers gas from the air inlet a into the housing 110. One or more plasma racks 120 are located within the housing 110, each housing an array of plasma generating units 121. During operation, when industrial waste gas enters the housing 110 through the air inlet a, driven by the induced draft fan, it sequentially flows through each plasma rack 120, coming into contact with the arrayed plasma generating units 121. The electrical control box applies a specific high-voltage electric field to the plasma generating units 121, rapidly ionizing the air molecules surrounding them to achieve deodorization. The principles of plasma deodorization are well known and will not be elaborated upon here.

[0040] refer to Figure 4-Figure 5 As shown, the plasma generating unit 121 includes a high electrode 11 and a low electrode 12, and the high electrode 11 and the low electrode 12 are both externally connected to the electric control box. The high electrode 11 is constructed as a ring structure and is arranged around the outer periphery of the low electrode 12, and a gap is left between the low electrode 12 and the high electrode 11; each plasma generating unit 121 is arranged in a rectangular plasma generating frame, and each high electrode 11 is separated by an insulating frame.

[0041] like Figure 5 As shown, the upper electrode 11 is a hollow cylindrical structure, with both its inner and outer walls covered with a dielectric layer, forming a bidirectional dielectric barrier. When the lower electrode 12 (a solid cylinder) is positioned at the center of the upper electrode 11, an axisymmetric annular discharge gap is formed between the two electrodes. This structure allows the discharge process to occur simultaneously in the gap between the lower electrode 12 and the dielectric layer, and in the gap between the dielectric layer and the upper electrode 11, forming a dual-dielectric cooperative discharge mechanism.

[0042] Compared with traditional flat electrodes, the combination of annular electrodes and cylindrical electrodes has a significant advantage in electric field uniformity. Based on the results of finite element simulation analysis, the circularly symmetrical structure makes the electric field intensity uniformly distributed radially along the discharge gap, effectively eliminating the electric field distortion at the edge of the flat electrode. Under the same voltage conditions, the electric field uniformity of this structure is improved by about 32% compared with the traditional structure, which increases the plasma generation efficiency per unit volume to 1.5 times. This uniform field distribution characteristic not only reduces the energy loss caused by local arcing, but also reduces the operating voltage required to maintain discharge by 15-20% by optimizing the ionization path. The coaxial annular electrode achieves 360° uniform discharge, breaking through the two-dimensional discharge limitations of the flat electrode.

[0043] It is worth noting that the dual dielectric layer has a dual effect on energy consumption control: on the one hand, the inner and outer dielectric layers form an equivalent series impedance through the capacitive coupling effect, which can effectively suppress the surge fluctuation of the discharge current and reduce the ineffective power consumption; on the other hand, the thermal conductivity characteristics of the dielectric layer help to quickly dissipate the Joule heat generated during the discharge process, avoiding the increase in energy loss caused by local temperature rise.

[0044] Moreover, in this embodiment, the axial direction of the upper electrode 11 and the lower electrode 12 is consistent with the direction from the air inlet a to the air outlet b, the electric control box is electrically connected to the plasma unit frame, and the electric control box is connected to a high voltage power supply.

[0045] As a result, each plasma generating unit 121 maintains its independent discharge function while maintaining highly consistent equivalent circuit characteristics. All high-voltage electrodes 11 are connected in parallel via a busbar, while the low-voltage electrodes 12 utilize a common ground design to connect to the same potential reference point. This topology allows the operating voltage of all parallel units to be uniformly controlled by the electrical control cabinet. Measurements show that the actual voltage deviation experienced by each unit does not exceed ±1.5%, eliminating the voltage fluctuation issues associated with power supply lines in traditional solutions.

[0046] Furthermore, in some preferred embodiments, an intelligent monitoring module can be installed in the electrical control box to collect the current phase data of each parallel branch in real time, and dynamically adjust the output parameters of the high-frequency inverter through the PID algorithm. When it is detected that the load impedance of a certain unit in a certain area changes due to uneven airflow distribution, the system installed in the electrical control box can complete the compensation adjustment within 20ms to ensure that all units always operate in the optimal power factor range. 3 / h processing capacity, it can save 2.1kWh of electricity per hour.

[0047] According to the industrial-grade plasma deodorization system of the embodiment of the present application, a dual-medium plasma generating unit 121 is formed by setting up a plurality of coaxial high-electrode stages and low-electrode stages arranged in a row, and the various units are connected in parallel through a busbar for unified power supply; based on the above structure, the power consumption required for large-scale deodorization systems such as industrial-grade plasma deodorization systems is greatly reduced, and the unitized plasma generating units 121 can ionize the air in various areas, which can maintain or even improve the deodorization effect while maintaining lower power consumption.

[0048] Furthermore, the plasma rack 120 includes a plurality of them, and the plasma deodorization equipment 100 further includes a pre-processing unit rack 130 disposed in the box body 110 .

[0049] Exemplary, reference Figure 3As shown, the pretreatment unit frame 130 and the plasma frame 120 are both configured as rectangular frames 122. The pretreatment unit frame 130 has a plurality of staggered skeleton structures within it, accommodating a plurality of pretreatment tubes 131 arranged in an array. The pretreatment unit frame 130 is positioned between the air inlet a and the plasma frame 120, with the axes of the pretreatment tubes 131 oriented along the air inlet a toward the air outlet b. The pretreatment tubes 131 are filled with a water-absorbing material, such as silica gel molecular sieve (SiO2·nH2O) or sodium polyacrylate-based super absorbent resin (SAP), to effectively control the intake air humidity within an optimal range. In some examples, the pretreatment tubes 131 can also be filled with biological treatment materials to treat odors.

[0050] It's understandable that when the relative humidity is high, the dielectric constant of water molecules in the discharge region is higher, significantly altering the electric field distribution and causing a decrease in plasma density. Simultaneously, the hydroxyl radicals (·OH) generated by the dissociation of water molecules compete with odor molecules for active particles, reducing the degradation efficiency of target pollutants. Therefore, controlling the air humidity can improve the ionization effect.

[0051] Further references Figure 2 As shown, the plasma deodorization equipment 100 also includes a filter 140 arranged in the box body 110, and the filter 140 includes a plurality of filters arranged in parallel in the thickness direction and arranged between the pretreatment unit frame 130 and the air inlet a; specifically, the filter 140 includes a first-level filter 141 and a second-level filter 142, and the filter density of each level of the filter 140 gradually increases to filter out particulate debris in the air.

[0052] Next, the plasma rack 120 in some embodiments is described in detail.

[0053] The plasma rack 120 includes a frame 122 and the plasma generating unit 121 disposed in the frame 122 .

[0054] refer to Figure 4-Figure 5 As shown, the frame 122 includes a first sub-frame 1221 and a second sub-frame 1222, and the first sub-frame 1221 and the second sub-frame 1222 are arranged on both sides of the thickness direction of the plasma frame 120; in this example, the first sub-frame 1221 and the second sub-frame 1222 are both structures with a grid-type skeleton arranged inside; Figure 5 As shown, a plasma generating unit 121 is provided in each grid, and the outer periphery of the high electrode 11 is wrapped with an insulating material with a circular hole inside and a square outer periphery to fix it to the first subframe 1221 and the second subframe 1222 .

[0055] A lead frame 123 is disposed between the first subframe 1221 and the second subframe 1222. A first circuit connected to the high electrode 11 and a second circuit connected to the low electrode 12 are disposed within the lead frame 123. Both the first and second circuits are connected to the electrical control box. Specifically, several busbars are disposed within the lead frame 123 for supplying power to the first circuit.

[0056] As described above, each plasma rack 120 can form two parallel arrays of plasma generating units 121 through its first sub-frame 1221 and second sub-frame 1222. This allows for simultaneous activation of the plasma generating units 121 in both the first sub-frame 1221 and the second sub-frame 1222, or activation of only one of the first sub-frame 1221 and the second sub-frame 1222, in different situations, to achieve mode switching.

[0057] Compared to switching via complex voltage regulation, which requires a voltage regulator such as an adjustable transformer or high-frequency switching power supply and complex control during regulation, this embodiment only uses a simple switching circuit to control the power supply to the two sub-frames 122. When the deodorization demand is low, simply turning off the power switch of one sub-frame 122 enables single sub-frame 122 operation, avoiding the additional energy loss caused by complex voltage regulation devices.

[0058] It is worth noting that when dual-medium plasma generating equipment is used in the prior art, although each pair of plates can be independently powered, some of the plasma generating units 121 cannot be cut off. On the one hand, this is because its structure itself is not suitable for cutting off some of the plasma generating units 121. On the other hand, cutting off some of the plates will result in extremely poor deodorization effect and when some of the plates are turned off, although the corresponding power supply module stops discharging, its standby power consumption still continues.

[0059] In some preferred embodiments, the radius ratio b / a of the upper electrode 11 and the lower electrode 12 is between 1.5 and 2.5, the dielectric layer is a ceramic dielectric layer with a dielectric constant ε≥8, and the thickness of the dielectric layer is 0.5 mm to 1.2 mm.

[0060] In detail, the dielectric layer includes a first dielectric layer 13 wrapped around the outer periphery of the high electrode 11 and a second dielectric layer 14 on the inner periphery; the first dielectric layer 13 is a high dielectric constant ferroelectric ceramic, and the second dielectric layer 14 is a porcelain oxide film, which can ensure the ionization effect and ensure that the power consumption of each plasma generating unit 121 is low.

[0061] In a further embodiment, the high electrode 11 is constructed as a conical hollow body, with a large diameter section of the conical hollow body facing the air inlet a and a small diameter section facing the air outlet b.

[0062] On the one hand, the tapered shape can leverage the geometric field enhancement effect to reduce the voltage required to sustain a discharge. For example, the high electrode 11 utilizes a conical hollow body whose radius of curvature continuously changes along the direction of the airflow. This creates an inverse relationship between the electric field intensity E and the electrode surface curvature radius ρ. Finite element simulations show that a local field intensity peak forms at the small-diameter end of the tapered electrode, reaching values 2.8-3.5 times the average field intensity. This reduces the discharge inception voltage to 58%-63% of that of a conventional cylindrical electrode.

[0063] This field enhancement effect works synergistically with the flow field characteristics. The large diameter end of the conical structure faces the air inlet a, so that the streamline curvature at the exhaust gas inlet matches the geometric curvature of the electrode, and the air flow velocity gradient increases from 12m / s at the inlet to 2 Reduced to 4m / s at the exit 2 Thus, the residence time of the exhaust gas in the discharge gap is extended to 0.6-0.8 seconds; thus, the discharge current density distribution and the exhaust gas concentration field are dynamically coupled, further reducing the power required by the plasma generating unit 121 and maintaining or even increasing the ionization effect.

[0064] Furthermore, the applicant discovered that the cylindrical plasma generating unit 121 in the above embodiment has a certain capacitance effect and produces the effect of a coaxial capacitor to a certain extent. Based on this, the applicant further proposed subsequent embodiments.

[0065] In some embodiments, the electrical control box can be provided with an energy recovery module, which includes: an energy storage capacitor group connected in parallel with the high electrode 11 and the low electrode 12, the energy storage capacitor group forming an LC oscillation circuit with the coaxial cylindrical capacitor through a high-frequency inductor; a bidirectional resonant rectifier bridge, including four groups of diodes connected in a full-bridge topology, and the input end is connected across the two ends of the energy storage capacitor group; and a flyback voltage conversion module, the primary winding of which is connected to the output end of the bidirectional resonant rectifier bridge, and the secondary winding is connected back to the high-voltage power bus through a rectifier and filtering unit.

[0066] Or any other common capacitor-based energy recovery circuit structure, the plasma generating unit 121 provided in the first subframe 1221 and the plasma generating unit 121 provided in the second subframe 1222 are activated and deactivated in turn; thereby, during the pulse discharge interval, energy recovery is achieved based on the LC oscillation circuit through the following path:

[0067] The residual charge of the electrode is transferred to the high-frequency inductor, then to the energy storage capacitor bank, then to the bidirectional resonant rectifier bridge, then to the flyback voltage conversion module, and finally to the high-voltage power bus. Of course, this is different in other energy recovery circuits.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An industrial-grade plasma deodorization system, comprising a spray tower, an induced draft fan, and a plasma deodorization device connected in sequence, wherein the induced draft fan introduces odor from the spray tower into the plasma deodorization device, characterized in that: The plasma deodorization equipment comprises: A box body, wherein the box body is configured with an air inlet and an air outlet, the induced draft fan delivers gas from the air inlet into the box body, one or more plasma racks are provided in the box body, and a plurality of plasma generating units are arranged in an array in the plasma rack; The plasma generating unit includes a high electrode and a low electrode. The high electrode is constructed in an annular structure and is arranged around the outer periphery of the low electrode. A gap is left between the low electrode and the high electrode. The axis direction of the high electrode and the low electrode is consistent with the direction from the air inlet to the air outlet. an electric control box, the electric control box being electrically connected to the plasma unit frame and connected to a high voltage power supply; The plasma deodorization equipment further includes a pre-treatment unit rack disposed within the housing; The pretreatment unit frame is arranged between the air inlet and the plasma frame. A plurality of pretreatment tubes arranged in an array are arranged in the pretreatment unit frame. The axis direction of the pretreatment tubes is along the air inlet toward the air outlet. The pretreatment tubes are filled with water-absorbing material.

2. The industrial-grade plasma deodorization system according to claim 1, characterized in that: The plasma deodorizing device further includes a filter screen disposed in the housing. The filter screen includes a plurality of filters sequentially arranged in parallel along the thickness direction and disposed between the pre-processing unit frame and the air inlet.

3. The industrial-grade plasma deodorization system according to claim 1, characterized in that: The plasma rack includes a frame and the plasma generating unit arranged in the frame; The frame includes a first sub-frame and a second sub-frame, which are arranged on both sides of the plasma frame in the thickness direction, and a lead frame is arranged between the first sub-frame and the second sub-frame; a first circuit connected to the high electrode and a second circuit connected to the low electrode are arranged in the lead frame, and the first circuit and the second circuit are both connected to the electric control box.

4. The industrial-grade plasma deodorization system according to any one of claims 1 to 3, characterized in that: The high electrode is constructed as a hollow cylinder, the inner and outer walls of which are covered with a dielectric layer. The low electrode is a solid cylinder, which is located at the center of the high electrode hollow cylinder, so that the distance between the low electrode and the high electrode in each area is consistent.

5. The industrial-grade plasma deodorization system according to claim 7, characterized in that: The radius ratio b / a of the upper electrode and the lower electrode is between 1.5 and 2.

5. The dielectric layer is a ceramic dielectric layer with a dielectric constant ε≥8, and the thickness of the dielectric layer is 0.5 mm to 1.2 mm.

6. The industrial-grade plasma deodorization system according to claim 5, characterized in that: The dielectric layer includes a first dielectric layer wrapped around the outer periphery of the high electrode and a second dielectric layer wrapped around the inner periphery; The first dielectric layer is a coated high-dielectric-constant ferroelectric ceramic, and the second dielectric layer is a ceramic oxide film.

7. The industrial-grade plasma deodorization system according to claim 4, characterized in that: The high electrode is constructed as a conical hollow body, wherein a large diameter section of the conical hollow body faces the air inlet and a small diameter section faces the air outlet.

8. The industrial-grade plasma deodorization system according to claim 4, characterized in that: A coaxial cylindrical capacitor formed by the upper electrode and the lower electrode; The electric control box is provided with an energy recovery module, and the energy recovery module comprises: An energy storage capacitor group connected in parallel with the high electrode and the low electrode, wherein the energy storage capacitor group forms an LC oscillation circuit with the coaxial cylindrical capacitor through a high-frequency inductor; a bidirectional resonant rectifier bridge, comprising four groups of diodes connected in a full-bridge topology, with an input end connected across the energy storage capacitor group; The flyback voltage conversion module has a primary winding connected to the output end of the bidirectional resonant rectifier bridge, and a secondary winding connected back to the high-voltage power bus through a rectifier and filter unit.

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