A two-stage high-voltage electrostatic deodorization system based on corona discharge and ozone oxidation

Abstract

This invention discloses a two-stage high-voltage electrostatic deodorization system based on corona discharge and ozone oxidation. The system includes a primary electric field, a variable-diameter adapter, and a secondary electric field connected in series. The primary electric field uses a 40,000-volt high voltage and a 90-mm discharge distance to achieve the cracking of large odor molecules and the adsorption of large particles; the secondary electric field uses a 10,000-volt high voltage and a 35-mm discharge distance to achieve deep oxidation of small odor molecules and enhanced adsorption of fine particles. Through the synergistic effect of corona discharge, electrostatic adsorption, and ozone oxidation, the system achieves an odor concentration removal rate of ≥70% at 40℃. This invention has a compact structure, strong adaptability, and is suitable for efficient deodorization and dust removal of industrial waste gases.

Description

Technical Field

[0001] This invention relates to the field of industrial waste gas treatment technology, and in particular to a two-stage high-voltage electrostatic deodorization system based on corona discharge and ozone oxidation. Background Technology

[0002] With increasingly stringent environmental protection requirements, the problem of odorous gas and dust pollution emitted from industrial production and municipal facilities (such as sewage treatment plants, garbage transfer stations, food processing plants, and chemical plants) has received widespread attention. These exhaust gases are usually complex in composition, containing various odorous substances such as hydrogen sulfide, ammonia, methanethiol, and volatile organic compounds (VOCs), as well as dust particles of different sizes, which have a serious impact on the surrounding environment and human health.

[0003] Currently, the main methods for treating this type of waste gas include physical, chemical, and biological methods. Physical methods, such as activated carbon adsorption, have good initial effects, but the adsorption material is easily saturated, regeneration is difficult, operating costs are high, and the treatment capacity for high-concentration waste gas is limited. Chemical scrubbing requires a large amount of chemical reagents and easily generates secondary polluting wastewater. Biological methods require a large area, are sensitive to operating conditions (such as pH, temperature, and humidity), have weak resistance to shock loads, and are not effective in treating some recalcitrant VOCs.

[0004] High-voltage electrostatic precipitator technology, as a highly efficient physical purification method, has mature applications in the dust removal field. Its principle is to ionize the gas using a high-voltage electric field, and the charged dust particles are then captured by the collecting electrode under the influence of the electric field. However, traditional single-stage electrostatic precipitators primarily target particulate matter, with limited ability to remove gaseous odor molecules. Although some research has attempted to combine electrostatics with ozone, utilizing ozone generated by an electric field for oxidation and deodorization, most of these methods employ a single-electrode structure, resulting in problems such as uneven mixing of ozone and exhaust gas, short contact time, and incomplete oxidation reactions. This leads to unstable deodorization efficiency, making it difficult to meet stringent emission standards. Furthermore, the simultaneous and efficient removal of pollutants of different particle sizes remains a technical challenge.

[0005] Therefore, it is necessary to develop a waste gas purification system that is compact, efficient, stable in operation, and capable of simultaneously and efficiently removing odors and multi-scale particulate matter. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a two-stage high-voltage electrostatic deodorization system and method based on corona discharge and ozone oxidation. This system, through a two-stage series-connected differentiated high-voltage electrostatic field design, coordinates three mechanisms: corona discharge cracking, electrostatic adsorption, and ozone oxidation. It aims to achieve efficient, stable, and simultaneous removal of odorous gases and multi-scale dust particles from pipeline exhaust gases, and features a compact structure, strong adaptability, and simple operation and maintenance.

[0007] Technical solution

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] This invention provides a two-stage high-voltage electrostatic deodorization system based on corona discharge and ozone oxidation.

[0010] The system includes a first-stage high-voltage electrostatic field unit, a diameter-changing transfer unit, and a second-stage high-voltage electrostatic field unit, which are connected in series along the direction of exhaust gas flow.

[0011] The first-stage high-voltage electrostatic field unit serves as a pretreatment and primary purification unit. It includes a first anode pipe, a serrated cathode discharge rod arranged along the axial centerline of the pipe, and a first high-voltage power supply for powering the discharge rod.

[0012] The first anode pipe has a diameter of 210 mm and a length of 3000 mm. The distance between the discharge tip of the serrated cathode discharge rod and the inner wall of the first anode pipe is set to 90 mm. The first high-voltage power supply provides a DC high voltage of 40,000 volts.

[0013] The larger pipe diameter and longer length ensure sufficient air volume and initial reaction space. A 90mm discharge distance is suitable for generating a strong corona discharge field, while providing ample space for the migration and adsorption of larger dust particles. The 40,000-volt high voltage is designed to generate a strong corona discharge, its core function being the preliminary cracking of large-molecule odorous pollutants in the exhaust gas, and the effective capture of larger dust particles through electrostatic adsorption. Simultaneously, this electric field also generates a small amount of ozone, pre-oxidizing some easily decomposable odorous gases.

[0014] Secondary high-voltage electrostatic field unit: serving as a deep purification and fine treatment unit. It includes a second anode pipe, a serrated cathode discharge rod arranged along the axial centerline of the pipe, and a second high-voltage power supply for powering the discharge rod.

[0015] The diameter of the second anode pipe is significantly reduced to 114 mm, and its length is designed to be 800 mm. The distance between the discharge tip of the serrated cathode discharge rod and the inner wall of the second anode pipe is shortened to 35 mm. The second high-voltage power supply provides a 10,000-volt DC high voltage.

[0016] Functional Design: The reduced pipe diameter significantly increases the exhaust gas velocity after the diameter change. The shorter discharge distance results in a higher electric field strength and denser field distribution at 10kV compared to the primary electric field. This design aims to: increase the flow velocity to enhance the turbulent mixing of exhaust gas with the electric field and ozone generated by the corona discharge; the higher electric field strength facilitates stable corona discharge, generating more active substances; and the shorter distance strengthens the electrostatic adsorption of submicron-sized fine particles. Its core function is to deeply oxidize residual small-molecule odor gases not completely treated in the primary stage and enhance the adsorption of fine particulate pollutants, thereby comprehensively improving overall deodorization and dust removal efficiency.

[0017] Variable diameter transition unit: serves as a connection and flow field optimization unit. It connects the outlet of the first-stage electric field unit and the inlet of the second-stage electric field unit.

[0018] Structure and Function: This unit features a smooth, tapered connector that allows for a smooth, tapered transition from a 210mm pipe diameter to a 114mm pipe diameter. Its interior undergoes special smoothing and guiding treatment. The core function is to prevent severe turbulence, eddies, or backflow at abrupt changes in cross-section, ensuring smooth acceleration and uniform entry of the airflow into the secondary electric field. This prevents decreased processing efficiency and dust accumulation inside the equipment due to turbulent flow.

[0019] The radius of curvature of the discharge tip of the serrated cathode discharge rod is limited to less than 0.5 mm. A smaller tip curvature facilitates the induction of corona discharge at lower voltages, improving discharge efficiency and stability while reducing the probability of spark discharge.

[0020] The second high-voltage power supply is connected to an independent high-voltage power supply control cabinet with intelligent control functions. This control cabinet not only provides a stable 10kV output, but also integrates a voltage regulation module (which can fine-tune the voltage within a certain range as needed), a current monitoring module (which monitors the discharge current in real time to reflect the electric field state), and an adaptive control function (which can automatically adjust the output voltage based on the feedback signal from the exhaust gas concentration sensor to adapt to different exhaust gas loads, achieving energy saving and efficient operation).

[0021] The system is optimized for exhaust gas conditions with temperatures ranging from 35°C to 45°C, and exhibits the best deodorization efficiency (dimensionless odor concentration elimination rate ≥70%) at 40°C. Within this temperature range, the ozone generation rate and stability, the activation energy of ozone molecules, and the resistivity of particulate matter are all at their optimal levels.

[0022] To improve the durability and reliability of the equipment, the inner surface of the first anode pipe and / or the second anode pipe may be coated with a corrosion-resistant conductive coating, such as a special anti-corrosion alloy coating or a conductive ceramic coating, to resist corrosive components that may be contained in the exhaust gas.

[0023] To monitor the system's operating status and ensure that the exhaust gas meets the standards, the system also includes an ozone concentration monitoring device located downstream of the secondary high-voltage electrostatic field unit (before the emission outlet) to monitor the residual ozone concentration in the purified gas in real time.

[0024] This invention provides a deodorization method using the above-described system.

[0025] The method includes the following steps:

[0026] S1: Under a 40,000-volt DC high voltage, a strong corona discharge is generated at the tip of the serrated discharge rod, releasing high-energy electrons, ions, and free radicals. High-energy electrons collide with odor molecules, breaking their chemical bonds and achieving the initial breakdown of large odor molecules. Simultaneously, the ions generated by the discharge charge dust particles, and under the influence of the electric field, large particles are adsorbed onto the wall of the first anode tube. This stage also involves the generation of a small amount of ozone, initiating the initial oxidation reaction.

[0027] S2: The smooth contraction of the pipe cross-section significantly increases the exhaust gas velocity, while the smooth inner wall design ensures a smooth airflow transition, creating uniform and high-speed flow field conditions for entering the next stage of deep treatment.

[0028] S3: Under the strong electric field created by a 10,000-volt high voltage and a shorter discharge distance, corona discharge continues, efficiently ionizing oxygen to generate a high concentration of ozone. The high flow rate increases the gas-solid / gas-liquid mixing intensity, extending the effective contact time. The strong oxidizing properties of ozone react fully with residual small-molecule odors through a redox reaction, completely converting them into inorganic substances such as CO2 and H2O. Simultaneously, the enhanced electric field exerts a strong adsorption effect on fine particulate matter (especially submicron-sized particles), achieving deep purification.

[0029] S4: After completing the above two-stage treatment, the gas has achieved a significant reduction in odor concentration and particulate matter concentration, and is discharged in compliance with emission standards through the emission pipeline.

[0030] In steps S1 and S3, the ozone used to oxidize and decompose odor molecules is derived from the ionization of oxygen (O2) in the air by corona discharge in this step, i.e., O2 → 2O, O + O2 → O3, thus realizing the self-generation of the reactant without the need for external addition of oxidant.

[0031] The method also includes an intelligent control step: based on the real-time feedback signal from the exhaust gas concentration sensor installed at the system inlet or between stages, the output voltage of the second high-voltage power supply is dynamically adjusted via the independent high-voltage power supply control cabinet. For example, when the exhaust gas concentration increases, the voltage is appropriately increased to enhance ozone production and oxidation capacity; when the concentration decreases, the voltage is decreased to save energy.

[0032] To ensure long-term stable operation of the system, the method specifies a maintenance cycle: every 20 to 40 consecutive days of system operation, the system needs to be shut down for thorough cleaning and maintenance of the anode tube walls and serrated discharge rods of the two-stage electric field units to remove dust deposits adsorbed and accumulated on the surface, so as to restore the uniformity of the electric field and the discharge performance.

[0033] In summary, this application includes at least one of the following beneficial technical effects of the method:

[0034] 1. The system deeply couples and synergistically utilizes three mechanisms—corona discharge cracking, electrostatic adsorption capture, and ozone oxidation decomposition—within a two-stage series electric field. The first-stage electric field aggressively targets large molecules and particles, while the second-stage electric field precisely refines and treats small molecules and fine particles. This clear division of labor and synergistic effect achieves simultaneous and efficient removal of odors and multi-scale dust, with the overall deodorization efficiency consistently above 70%.

[0035] 2. The system adopts a modular pipeline design, resulting in an extremely compact structure and controllable overall length. Equipped with standard flange interfaces at both ends, it can be directly connected in series with existing exhaust gas pipelines without requiring large-scale modifications to civil engineering or pipeline layout, making it particularly suitable for upgrading existing facilities.

[0036] 3. The secondary electric field is equipped with an independent intelligent control cabinet, which can automatically adjust the operating parameters according to the changes in the exhaust gas load, so as to achieve optimal energy utilization while ensuring the treatment effect and reducing operating costs.

[0037] 4. The targeted interstage diameter variation design optimizes the flow field and avoids the drawbacks of turbulence. Clearly defined maintenance cycles and simple cleaning procedures ensure stable and reliable equipment operation, minimal maintenance workload, and convenient management.

[0038] 5. The odor is ultimately oxidized and decomposed into harmless carbon dioxide and water, resulting in thorough purification. The ozone required for the reaction is generated in situ from the air inside the electric field, eliminating the need for storage and addition of hazardous chemicals, thus removing transportation and storage risks. The system is equipped with multiple electrical safety protections and ozone monitoring to ensure safe and environmentally friendly operation. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the two-stage high-voltage electrostatic deodorization system described in this invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be described in further detail below with reference to the accompanying drawings. The following embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection of this invention.

[0041] Example 1: System Configuration and Connection

[0042] The two-stage high-voltage electrostatic deodorization system provided by this invention consists of a primary high-voltage electrostatic field unit 1, a variable diameter transfer unit, and a secondary high-voltage electrostatic field unit connected in series via flanges. Exhaust gas enters the system from the left inlet, flows through the three units sequentially, and is discharged from the right after purification.

[0043] The first flange of the primary unit can be connected to the exhaust gas source pipeline at the front end, and the last flange of the secondary unit can be connected to the exhaust pipeline at the rear end. An ozone concentration monitoring device can optionally be installed near the outlet of the secondary unit.

[0044] Example 2: The core of the first-stage high-voltage electrostatic field unit is the first anode pipe, which is a metal circular pipe with an inner diameter of 210mm and a length of 3000mm. It is preferably made of 304 or 316L stainless steel, and the inner wall is precision polished to ensure a smooth surface. Standard flanges are welded to both ends of the pipe.

[0045] A serrated cathode discharge rod is fixed to the axis of the first anode pipe via an insulating support. The discharge rod is made entirely of metal with continuous, sharp serrations machined onto its surface. The closest distance between the tip of each serration and the inner wall of the first anode pipe is constant at 90 mm. The positive terminal of the first high-voltage power supply is grounded and connected to the first anode pipe, while the negative terminal is connected to the serrated cathode discharge rod.

[0046] Example 3: The core of the two-stage high-voltage electrostatic field unit is the second anode pipe, which is a metal circular tube with an inner diameter of 114 mm and a length of 800 mm. The material and inner wall treatment are the same as those of the first-stage pipe. A serrated cathode discharge rod is fixed to its axis via an insulating support. The distance between the serrated tip of this discharge rod and the inner wall of the second anode pipe is constant at 35 mm. The positive terminal of the second high-voltage power supply and independent control cabinet is grounded and connected to the second anode pipe, while the negative terminal is connected to the serrated cathode discharge rod. The control cabinet has a touch screen that can display voltage and current, and set manual / automatic adjustment modes.

[0047] The reducing adapter is a steel tapered pipe fitting. Its large end has an inner diameter of 210mm, its small end has an inner diameter of 114mm, its taper is approximately 8°, and the transition section is approximately 300mm long. Its key feature is that the inner wall is specially machined to form a smooth, low-roughness guide surface, ensuring smooth and stable airflow during contraction without generating separation vortices.

[0048] Example 5: The deodorization method of the invention is implemented according to the following process:

[0049] Step S1: The exhaust gas containing odor and dust enters the primary unit. After a 40kV high voltage is applied, a strong blue corona glow is generated at the tip of the discharge rod. Large molecular VOCs such as benzene compounds in the exhaust gas undergo bond breakage under high-speed electron impacts, and some are partially decomposed; dust particles become charged, move towards the pipe wall, and are adsorbed. At this stage, the odor concentration begins to decrease.

[0050] Step S2: The gas enters the variable diameter unit, and the flow velocity increases from about 10 m / s to about 35 m / s, and enters the secondary unit in a uniform flow state.

[0051] Step S3: Gas enters the secondary unit. A strong electric field is formed within a 35mm gap by a 10kV high voltage, resulting in continuous corona discharge and the generation of a large amount of ozone. The high-speed airflow carries residual hydrogen sulfide, ammonia, and other small molecule odor gases, which mix and react thoroughly with the ozone, being oxidized into sulfates, nitrates, etc. Simultaneously, PM2.5 and even finer particles are efficiently adsorbed onto the pipe wall under the strong electric field.

[0052] Step S4: After the purified gas is confirmed by the ozone concentration monitoring device to meet the ozone residue standard, it is led to the exhaust pipe by the fan for discharge.

[0053] Example 6: Intelligent Control and Maintenance

[0054] In automatic operation mode, the online VOCs detector at the inlet transmits the concentration signal to the control cabinet. When the concentration exceeds the preset threshold, control cabinet 3 automatically adjusts the output voltage from 10kV to 12kV to enhance oxidation capacity; when the concentration decreases, the voltage is adjusted back to 9kV to save energy. After 30 days of continuous system operation, the control cabinet issues a maintenance reminder. After powering off, the operator opens the inspection ports of each unit, uses a long-handled wiping tool to remove accumulated dust from the pipe walls, cleans the tip of the discharge rod with a soft cloth soaked in anhydrous ethanol, checks the insulation components, resets them, and restarts the system.

[0055] Working principle

[0056] This system employs a two-stage series high-voltage electrostatic deodorization technology combining pyrolysis adsorption and oxidative purification. Through differentiated design of structural parameters and electric field strength, it achieves efficient synergy in both space and function among three purification mechanisms: corona discharge pyrolysis, electrostatic adsorption capture, and ozone oxidation decomposition. The main body of the system consists of a primary high-voltage electrostatic field unit, a variable-diameter transfer unit, and a secondary high-voltage electrostatic field unit connected in series along the direction of exhaust gas flow, forming a compact and efficient pipeline-type purification channel.

[0057] The first-stage electric field unit serves as a pretreatment and coarse purification stage, designed to handle large-volume waste gas and specifically remove large molecular pollutants and larger particulate matter. This unit employs a 210 mm diameter, 3000 mm long metal anode pipe, with serrated cathode discharge rods precisely arranged along its axial centerline. The distance between the discharge tip and the anode pipe wall is set at 90 mm. When the system is powered on, a high-voltage power supply provides a DC voltage of up to 40,000 volts, creating an extremely strong local electric field near the sharp serrated tips of the discharge rods, exciting a stable and intense corona discharge. This process generates a massive amount of high-energy electrons, active ions, and free radicals. These high-energy particles collide with the flowing waste gas molecules at extremely high speeds, effectively breaking down the chemical bonds of odorous pollutants such as hydrogen sulfide, ammonia, and complex volatile organic compounds, initially fracturing them into smaller molecular fragments with simpler structures. Simultaneously, the ions generated in the corona zone charge the surfaces of suspended dust particles and microparticles formed after pyrolysis in the exhaust gas. Driven by a strong electrostatic field, these charged particles migrate directionally to the grounded anode tube wall and are firmly adsorbed, thus achieving efficient capture of large particles. Furthermore, during the high-voltage discharge process, some oxygen in the air is ionized and combines to generate ozone, initiating preliminary oxidation of some easily oxidized odor components, laying the foundation for subsequent advanced treatment.

[0058] After primary treatment, the exhaust gas then enters the crucial variable-diameter transfer unit. This unit is a conical structure with a specially smoothed inner wall, achieving a smooth and gradual transition from a pipe diameter of 210 mm to 114 mm. Its core function is flow field organization and optimization: by significantly reducing the cross-sectional area of ​​the pipe, the exhaust gas velocity is greatly increased, enhancing airflow turbulence; at the same time, the smooth guide inner wall minimizes undesirable flow patterns such as airflow separation, eddies, or backflow that may occur due to abrupt changes in cross-section, ensuring that the airflow can accelerate smoothly and uniformly into the next stage electric field. This creates ideal hydrodynamic conditions for subsequent efficient reactions and prevents a decrease in treatment efficiency or dust accumulation inside the equipment due to flow field disturbances.

[0059] Subsequently, the optimized high-speed exhaust gas enters the second-stage electric field unit, namely the deep purification and fine treatment stage. This unit features a completely different design, employing an anode pipe with a reduced diameter of 114 mm and a length of 800 mm, shortening the discharge gap to 35 mm. Although its operating voltage is provided by an independent second high-voltage power supply with a nominal value of 10,000 volts, according to the electric field strength calculation formula, due to the significant reduction in the discharge gap, its actual electric field strength is much higher than the first-stage electric field, with a more dense and concentrated distribution of field strength lines. Under this high-intensity electric field environment, corona discharge can proceed more efficiently and stably, thereby greatly improving the ozone generation efficiency and concentration. The high-speed flowing exhaust gas and high-concentration ozone achieve sufficient mixing and contact time within the narrow pipe space. Ozone, with its extremely strong oxidizing properties, undergoes a complete oxidation-reduction reaction with the hydrogen sulfide, ammonia, and small-molecule organic matter remaining after the first-stage treatment, ultimately converting them into non-toxic and harmless inorganic substances such as carbon dioxide, water, sulfates, and nitrates, achieving fundamental odor removal. At the same time, the significantly enhanced electric field force also generates a stronger electrostatic adsorption effect on submicron and finer particles, achieving deep purification of fine particulate pollutants and comprehensively improving the overall dust removal efficiency.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Obviously, the embodiments described above are only some embodiments of this invention, not all embodiments. The accompanying drawings show preferred embodiments of this invention, but do not limit the patent scope of this invention. This invention can be implemented in many different forms; on the contrary, the purpose of providing these embodiments is to make the disclosure of this invention more thorough and complete. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A two-stage high-voltage electrostatic deodorization system based on corona discharge and ozone oxidation, characterized in that, It includes a first-stage high-voltage electrostatic field unit, a variable diameter transfer unit, and a second-stage high-voltage electrostatic field unit connected in series along the direction of exhaust gas flow. The first-stage high-voltage electrostatic field unit includes a first anode pipe, a serrated cathode discharge rod arranged along its axial direction, and a first high-voltage power supply; the first anode pipe has a diameter of 210 mm and a length of 3000 mm; the distance between the tip of the discharge rod and the wall of the first anode pipe is 90 mm; the first high-voltage power supply provides a DC voltage of 40,000 volts. The secondary high-voltage electrostatic field unit includes a second anode pipe, a serrated cathode discharge rod arranged along its axial direction, and a second high-voltage power supply; the second anode pipe has a diameter of 114 mm and a length of 800 mm; the distance between the tip of the discharge rod and the wall of the second anode pipe is 35 mm; the second high-voltage power supply provides a DC voltage of 10,000 volts; The variable diameter adapter unit is a tapered connector with a smooth inner wall, enabling a smooth transition from a pipe diameter of 210mm to 114mm.

2. The one according to claim 1, characterized in that, The radius of curvature of the discharge tip of the serrated cathode discharge rod is less than 0.5 mm.

3. The one according to claim 1, characterized in that, The second high-voltage power supply is connected to an independent high-voltage power supply control cabinet, which has voltage regulation, current monitoring and adaptive control functions.

4. The one according to claim 1, characterized in that, The system is suitable for exhaust gas conditions with temperatures ranging from 35°C to 45°C, and its deodorization efficiency is optimal at 40°C.

5. The one according to claim 1, characterized in that, The inner surface of the first anode pipe and / or the second anode pipe is coated with a corrosion-resistant conductive coating.

6. The one according to claim 1, characterized in that, The system also includes an ozone concentration monitoring device located downstream of the secondary high-voltage electrostatic field unit.

7. A deodorization method using the system described in any one of claims 1-6, characterized in that, Includes the following steps: S1: The exhaust gas enters the first-level high-voltage electrostatic field unit, where corona discharge occurs under a high voltage of 40,000 volts, initially breaking down large molecular odors and adsorbing fine particulate matter. S2: The treated exhaust gas is accelerated and the flow field is stabilized by the variable diameter transfer unit; S3: The exhaust gas enters the secondary high-voltage electrostatic field unit, where ozone is generated under a high voltage of 10,000 volts, which deeply oxidizes the residual small molecule odor and adsorbs fine particulate matter. S4: Purified gas emission.

8. The method according to claim 7, characterized in that, In steps S1 and S3, the corona discharge ionizes oxygen in the air to generate ozone, which is used to oxidize and decompose odor molecules.

9. The method according to claim 7, characterized in that, The method further includes the step of dynamically adjusting the output voltage of the second high-voltage power supply through the independent high-voltage power supply control cabinet based on feedback from the exhaust gas concentration sensor.

10. The method according to claim 7, characterized in that, Every 20 to 40 days of operation, the anode tube walls and discharge rods of the two-stage electric field units need to be cleaned and maintained to restore the electric field performance.

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