Non-equilibrium hydrogen and oxygen radical synergistic excitation device

Abstract

The application discloses a non-equilibrium hydrogen-oxygen radical synergic excitation device, belonging to the technical field of waste gas treatment, which comprises a Venturi jet mixing section, a rectification and stabilization cabin and a DBD plasma reaction core bin which are sequentially connected, the end of the Venturi jet mixing section away from the rectification and stabilization cabin is connected with incineration flue gas, a plurality of HHO injection assemblies for introducing HHO gas are connected to the Venturi jet mixing section, a plurality of discharge units are arranged in the DBD plasma reaction core bin, a monitoring mechanism is arranged at the end of the DBD plasma reaction core bin away from the rectification and stabilization cabin, and a high-voltage introduction interface is arranged on the DBD plasma reaction core bin. The hydrogen-oxygen mixed gas is introduced into a non-thermal equilibrium plasma field, and precise dissociation is realized by using an energy 'targeting' mechanism, so that a free radical 'ocean' with super-high density and extremely strong oxidation potential is created in an environment below 200 DEG C, the thermodynamic energy barrier is crossed, and dioxin is safely, efficiently and completely dechlorinated, ring-opened and mineralized.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment technology, and in particular relates to a non-equilibrium state hydroxyl radical synergistic excitation device. Background Technology

[0002] The formation and trace escape of highly toxic byproduct dioxins (PCDD / Fs) during high-temperature incineration of solid waste, hazardous waste, and medical waste have long been a major challenge in the industry. Existing technologies typically employ the following methods for treatment, but these methods have significant drawbacks: Traditional high-temperature incineration / combustion: This method requires consuming a large amount of fuel to heat the macroscopic gas to 800°C or even above 1500°C. Its disadvantages are extremely high energy consumption, and in the low-temperature zone where the flue gas is cooled, dioxins are prone to undergo precursor reactions and "secondary synthesis"; at the same time, high-temperature and oxygen-enriched combustion easily produces a large amount of nitrogen oxides (NOx), causing secondary pollution.

[0003] Traditional air dielectric barrier discharge (DBD) cryogenic plasma technology: While this technology can operate at room temperature / low temperature, the presence of a large amount of nitrogen in the air means that most of the electron energy generated by the high-frequency electric field is consumed in vibrational excitation to break the inert bonds of nitrogen molecules (N≡N bond energy is as high as 9.8 eV), resulting in ineffective heating. This leads to a low density of free radicals actually used for pollutant degradation within the system (only 10). 13 -10 14 cm -3 (At the order of magnitude), the oxidizing power is insufficient to completely destroy the stable benzene ring conjugated structure and highly toxic C-Cl bond of dioxins. Furthermore, air discharge readily produces ozone (O3) and NO. x Byproducts, etc. Summary of the Invention

[0004] The purpose of this invention is to provide a non-equilibrium hydroxyl radical synergistic excitation device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a non-equilibrium hydroxyl radical synergistic excitation device, comprising a Venturi jet mixing section, a rectifier and stabilizer chamber, and a DBD plasma reaction core chamber connected in sequence. The Venturi jet mixing section, at the end furthest from the rectifier and stabilizer chamber, is supplied with combustion flue gas. Multiple HHO injection components for introducing HHO gas are connected to the Venturi jet mixing section. Multiple discharge units are arrayed within the DBD plasma reaction core chamber. A monitoring mechanism is located at the end of the DBD plasma reaction core chamber furthest from the rectifier and stabilizer chamber. A high-voltage inlet port is located on the DBD plasma reaction core chamber.

[0006] Optionally, the Venturi jet mixing section includes an inlet section, a constriction section, a throat, and a diffuser section arranged sequentially, with multiple HHO jet components equally spaced around the outside of the throat.

[0007] Optionally, the HHO spray assembly includes a micro-mist nozzle communicating with the throat, a one-way valve is provided at the end of the micro-mist nozzle away from the throat, and a miniature flame arrester is provided at the end of the one-way valve away from the micro-mist nozzle.

[0008] Optionally, the micro-mist nozzle is at a 45° tangential angle to the airflow direction.

[0009] Optionally, the contraction angle of the contraction section is 20°, and the diffusion angle of the diffusion section is 12°.

[0010] Optionally, a honeycomb rectifier mesh can be detachably connected inside the rectifier and stabilization chamber.

[0011] Optionally, the discharge unit includes a central high-voltage electrode, a discharge gap, a dielectric barrier layer, and a grounding electrode arranged sequentially from the inside to the outside, with insulating supports provided at both ends of the dielectric barrier layer.

[0012] Optionally, the monitoring device includes a temperature sensor and multiple H2 concentration monitoring interfaces.

[0013] Optionally, an observation window is provided outside the DBD plasma reaction core chamber.

[0014] Optionally, the spacing between two adjacent discharge units located at the same horizontal position is 60 mm.

[0015] The present invention discloses the following technical effects: The present invention introduces a hydrogen-oxygen mixture (HHO) into a non-thermal equilibrium plasma field and uses an energy "targeting" mechanism to precisely dissociate it, creating an ultra-high density, extremely strong oxidation potential free radical "ocean" in an environment below 200°C, crossing the thermodynamic energy barrier, and safely, efficiently and thoroughly dechlorinating, ring-opening and mineralizing dioxins.

[0016] This invention overcomes the energy consumption limitations of traditional air-based deep oxidation decomposition (DBD) corona discharge. The electronic energy of this invention is preferentially and specifically used to break the easily dissociated HHO bonds, avoiding the significant energy wastage on N2 vibrational excitation and achieving extremely high energy efficiency. Its strong electrophilic attack and dechlorination capabilities can cleave 3.5 eV C-Cl bonds and 6.4 eV benzene ring skeleton C=C bonds, thereby completely mineralizing dioxins and eliminating the problem of "trace escape" of dioxins in conventional treatment. The entire deep oxidation degradation reaction is completed at a macroscopic gas temperature of <200℃, which not only breaks the limitation that dioxins can only be oxidized under high-temperature incineration conditions but also fundamentally blocks the dioxin resynthesis mechanism during flue gas cooling. Simultaneously, the introduction of a hydrogen reducing atmosphere effectively inhibits the formation of toxic byproducts such as ozone and NOx. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the non-equilibrium state hydroxyl radical synergistic excitation device of the present invention; Figure 2 This is a schematic diagram of the discharge unit of the present invention; Figure 3 This is a cross-sectional view of the throat and HHO injection assembly of the present invention; Figure 4 This is a schematic diagram of the HHO tangential principle of the present invention; Figure 5 This is a schematic diagram of the structure of the cellular rectifier mesh of the present invention; Figure 6 This is a schematic diagram of the discharge unit array of the present invention.

[0018] Figure label: 1. Venturi jet mixing section; 2. Rectifying and stabilizing chamber; 3. DBD plasma reaction core chamber; 4. High-voltage inlet interface; 5. Inlet section; 6. Contraction section; 7. Throat; 8. Diffusion section; 9. Micro-mist nozzle; 10. One-way valve; 11. Miniature flame arrester; 12. Honeycomb rectifier mesh; 13. Central high-voltage electrode; 14. Discharge gap; 15. Dielectric barrier layer; 16. Grounding electrode; 17. Insulation support; 18. Temperature sensor; 19. H2 concentration monitoring interface; 20. Observation window. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figures 1 to 6 As shown, this embodiment provides a non-equilibrium hydrogen and oxygen radical synergistic excitation device, including a Venturi jet mixing section 1, a rectifier and stabilizer chamber 2, and a DBD plasma reaction core chamber 3 connected in sequence. The end of the Venturi jet mixing section 1 away from the rectifier and stabilizer chamber 2 is supplied with combustion flue gas. Multiple HHO injection components for introducing HHO gas are connected to the Venturi jet mixing section 1. Multiple discharge units are arrayed inside the DBD plasma reaction core chamber 3. A monitoring mechanism is provided at the end of the DBD plasma reaction core chamber 3 away from the rectifier and stabilizer chamber 2. A high-voltage inlet interface 4 is provided on the DBD plasma reaction core chamber 3.

[0022] This invention introduces a hydrogen-oxygen mixture (HHO) into a non-thermal equilibrium plasma field and uses an energy "targeting" mechanism to precisely dissociate it, creating an ultra-high density, extremely strong oxidation potential free radical "ocean" in an environment below 200°C. This overcomes the thermodynamic energy barrier and safely, efficiently, and thoroughly dechlorinates, ring-opens, and mineralizes dioxins.

[0023] This invention overcomes the energy consumption limitations of traditional air-based deep oxidation decomposition (DBD) corona discharge. The electronic energy of this invention is preferentially and specifically used to break the easily dissociated HHO bonds, avoiding the significant energy wastage on N2 vibrational excitation and achieving extremely high energy efficiency. Its strong electrophilic attack and dechlorination capabilities can cleave 3.5 eV C-Cl bonds and 6.4 eV benzene ring skeleton C=C bonds, thereby completely mineralizing dioxins and eliminating the problem of "trace escape" of dioxins in conventional treatment. The entire deep oxidation degradation reaction is completed at a macroscopic gas temperature of <200℃, which not only breaks the limitation that dioxins can only be oxidized under high-temperature incineration conditions but also fundamentally blocks the dioxin resynthesis mechanism during flue gas cooling. Simultaneously, the introduction of a hydrogen reducing atmosphere effectively inhibits the formation of toxic byproducts such as ozone and NOx.

[0024] Further optimizing the design, the Venturi jet mixing section 1 includes an inlet section 5, a contraction section 6, a throat 7, and a diffuser section 8 arranged sequentially, with multiple HHO jet components evenly spaced around the outside of the throat 7. The total length of the Venturi jet mixing section 1 is 550 mm, of which the inlet section 5 is 200 mm long and the throat 7 is 150 mm long.

[0025] The HHO injection assembly is further optimized by including a micro-mist nozzle 9 connected to the throat 7. A one-way valve 10 is provided at the end of the micro-mist nozzle 9 away from the throat 7, and a miniature flame arrester 11 is provided at the end of the one-way valve 10 away from the micro-mist nozzle 9.

[0026] The design was further optimized so that the micro-mist nozzle 9 forms a 45° tangential angle with the airflow direction.

[0027] Four G1 / 4" interfaces are evenly opened in the circumferential direction of the throat 7, and 316L micro-mist nozzles 9 are installed. The micro-mist nozzles 9 are at a 45° tangential angle with the airflow direction to generate swirling flow in the pipe. Each micro-mist nozzle 9 is equipped with a miniature flame arrester 11 and a one-way valve 10 at the front end to prevent HHO backfire and flue gas backflow.

[0028] When dealing with ultra-large air volumes, the HHO tangential nozzles of the Venturi jet mixing section 1, in addition to four in a single ring, can be expanded into a multi-stage circumferential annular jet array. The tangential angle can be adjusted between 30° and 60° according to the results of pipeline fluid dynamics simulation, or the single Venturi tube can be replaced with a multi-tube parallel Venturi array module to ensure the dispersion of microbubbles.

[0029] In practical industrial applications, where extremely stringent explosion-proof requirements exist, the gas source introduced into the reactor does not necessarily have to be pure HHO gas. HHO can be pre-mixed with natural gas or other inert / protective carrier gases (e.g., at a HHO ratio of 5-10%) before being injected into the plasma reactor via a Venturi tube; or this device can be used as a back-end module, connected to the exhaust port of a high-temperature medical waste incinerator that employs a "natural gas + HHO co-firing" process, forming a complete closed-loop system solution from high-temperature degradation to low-temperature free radical deep purification.

[0030] The scheme was further optimized so that the contraction angle of the contraction section 6 is 20° and the diffusion angle of the diffusion section 8 is 12°.

[0031] The design is further optimized by incorporating a detachable honeycomb rectifier mesh 12 within the rectifier and flow stabilization chamber 2. The rectifier and flow stabilization chamber 2, 300mm in length, is used to eliminate fluid turbulence. It contains a 50mm thick, 10mm aperture 304 stainless steel honeycomb rectifier mesh 12, which is secured within the chamber by snap rings and is removable for cleaning.

[0032] The scheme is further optimized. The discharge unit includes a central high-voltage electrode 13, a discharge gap 14, a dielectric barrier layer 15 and a grounding electrode 16 arranged sequentially from the inside to the outside. Insulating supports 17 are provided at both ends of the dielectric barrier layer 15.

[0033] The DBD plasma reaction core chamber 3 is equipped with a 4mm thick 316L stainless steel rolled shell, with a Φ100 high-temperature quartz glass observation window (observation window 20). 19-37 discharge tubes are arranged in a regular hexagonal honeycomb pattern with a spacing of 60mm. The central high-voltage electrode 13 is a Φ8mm titanium alloy rod with rounded ends to improve electron emission rate. The discharge gap 14 is a 2.5mm annular gas channel for flue gas and HHO mixed flow. The dielectric barrier layer 15 is a Φ25×2mm, 1000mm long high-purity dehydroxylated quartz glass tube. The grounding electrode 16 is a 316L stainless steel braided mesh tightly wrapped around the outer wall of the quartz glass tube. The two ends of the dielectric barrier layer 15 are supported by 20mm thick polytetrafluoroethylene or alumina ceramic tube sheets as insulation supports 17. The quartz glass tube and the tube sheet are flexibly sealed by fluororubber O-rings.

[0034] The number of discharge units in the DBD plasma reaction core is not limited to 19 or 37. The insulating tube sheet can be designed with a larger processing diameter according to the actual factory exhaust air volume to accommodate hundreds of arrays. Furthermore, the equipment installation method can be adjusted by external flanges and brackets to be fully compatible with the installation environment of horizontal pipes and vertical exhaust towers.

[0035] For exhaust gas conditions with stronger corrosiveness or higher requirements, the central high-voltage electrode 13 of the single discharge tube can be replaced with Hastelloy, which has higher corrosion resistance, or a 316L stainless steel rod coated with a precious metal catalyst, in addition to titanium alloy; the glass tube serving as the dielectric barrier layer 15 can be replaced with a dense high-purity alumina (corundum) ceramic tube with a higher dielectric constant and extremely high pressure resistance, in addition to hydroxyl JGS2 quartz.

[0036] The scheme has been further optimized, and the monitoring mechanism includes a temperature sensor 18 and multiple H2 concentration monitoring interfaces 19.

[0037] The design has been further optimized, with an observation window 20 installed outside the DBD plasma reaction core chamber 3.

[0038] The scheme was further optimized so that the spacing between two adjacent discharge units located at the same horizontal position is 60mm.

[0039] The shell has two 20kV ceramic through-wall bushings (insulators) on the side, which are high-voltage inlet interfaces 4. The interior is connected in parallel with all the central titanium rods through flexible copper braided strips. The outlet end of the DBD plasma reaction core chamber 3 is equipped with a Pt100 temperature sensor interface 18, and explosion-proof H2 concentration monitoring interfaces 19 are reserved before and after the reaction section. It is equipped with a PLC control interface to realize the interlocking safety control of fan shutdown and HHO air inlet valve (closed within 0.5 seconds).

[0040] The device of this invention is based on a multi-field coupling mechanism of "fluid-enhanced mixing-non-equilibrium plasma directional energy deposition-high-density free radical synergistic reaction" to achieve efficient dechlorination, ring-opening, and deep mineralization of recalcitrant organic pollutants (especially PCDD / Fs) under low-temperature conditions. The reaction process can be divided into the following three mutually coupled stages.

[0041] Non-equilibrium plasma physical excitation mechanism After being thoroughly mixed in the Venturi jet mixing section 1 and rectified in the rectifier and stabilization chamber 2, the flue gas and the hydrogen-oxygen mixture enter the DBD plasma reaction core. Under the action of a high-frequency high-voltage power supply (preferably 10–20 kV and 10–30 kHz), a strong electric field is established between the central high-voltage electrode 13 and the external grounding electrode 16, thereby triggering a typical dielectric barrier discharge process. Under the action of this electric field, the initial free electrons in the gas are rapidly accelerated and undergo inelastic collisions with gas molecules, inducing a cascade ionization reaction and forming an “electron avalanche” process, continuously generating a large number of high-energy electrons, excited-state particles, and active intermediates.

[0042] This discharge process exhibits significant non-thermal equilibrium characteristics, with typical parameters as follows: Electron temperature: Te≈10 4 -10 5 K (corresponding to energy of approximately 1–10 eV). Gas temperature: Tg≈400–500K (i.e., less than 250℃); Ion temperature: close to gas temperature.

[0043] The above characteristics indicate that the system is in a typical "high electron temperature - low gas temperature" non-equilibrium state. This state allows the input energy to be preferentially used for the selective breaking of molecular bonds, rather than for macroscopic gas heating, thereby significantly reducing energy consumption and achieving high-efficiency reactions at low temperatures.

[0044] Cooperative directed dissociation mechanism of hydrogen-oxygen system Under the influence of high-energy electrons in a non-equilibrium state, the hydrogen-oxygen component (HHO) in the mixed gas undergoes preferential and selective dissociation, which is the key mechanism for achieving efficient energy utilization in this invention.

[0045] 1. Energy matching and selective excitation The key molecular bond energies and electron energy distributions in the system are as follows: The H–OH bond energy is approximately 4.8 eV; The average energy of discharged electrons is concentrated in the 6–8 eV range; The N≡N bond energy is approximately 9.8 eV.

[0046] Because the electron energy is highly matched with the bond energy of the HHO molecule, and is below the excitation threshold of the nitrogen molecule, the following can be achieved: Preferentially excitation and dissociation of HHO molecules; Avoid energy dissipation due to ineffective vibrational excitation by N2; Significantly improves plasma energy utilization efficiency.

[0047] 2. Free radical generation reaction pathway Under electron bombardment, the following key reactions occur in the system: (1) Primary dissociation reaction: H2O / HHO→OH+·H; H2→2·H; O2→2·O; (2) Chain reaction and free radical regeneration: O + H₂ → ·OH + ·H; H+O2→HO2·; HO2·→·OH+O; Through the above reaction chain, a continuously regenerating free radical network is formed within the system.

[0048] 3. Formation of high-density free radical fields Under continuous discharge conditions, an ultra-high density of active free radical environment is formed in the reaction zone: Hydroxyl radical (·OH): 10 17 -10 18 cm⁻³; Hydrogen radical (·H): 10 16 -10 17 cm⁻³.

[0049] Compared to traditional air DBD systems (10 13 -10 14 The concentration of free radicals increases by about 3–4 orders of magnitude (cm⁻³), thereby constructing a "highly active free radical reaction field" that provides decisive conditions for the rapid degradation of subsequent pollutants.

[0050] Deep oxidation mineralization mechanism of pollutants In the aforementioned high-density free radical environment, organic pollutant molecules such as PCDD / Fs undergo multi-pathway synergistic reactions, mainly including dechlorination, ring opening, and deep oxidation processes.

[0051] 1. Dechlorination reaction (reduction pathway) Hydrogen radicals (·H) preferentially attack the C–Cl bonds in pollutant molecules: R–Cl+·H→R·+HCl; This reaction achieves: Effective removal of highly toxic chlorine atoms; disruption of dioxin toxicity structures; inhibition of the regeneration of chlorinated organic compounds.

[0052] 2. Aromatic structure ring opening (oxidation pathway) Hydroxyl radicals (·OH) have an oxidation potential as high as 2.80V, which can strongly electrophilically attack aromatic ring structures: attack C=C bonds; undergo addition reactions; destroy aromatic conjugated structures and induce ring opening.

[0053] 3. Deep oxidation mineralization process The intermediate products after dechlorination and ring-opening are further decomposed under continuous free radical bombardment, eventually transforming into stable small molecule products: R·→ intermediate product→CO2+H2O+HCl; achieving complete harmless mineralization of pollutants.

[0054] 4. Byproduct inhibition mechanism Because the introduction of a hydrogen-oxygen mixture into the system creates a reducing atmosphere, the formation of byproducts can be effectively suppressed: the formation of ozone (O3) is suppressed; the formation of nitrogen oxides (NO) is suppressed. x It generates and inhibits the resynthesis of dioxins in the low-temperature region.

[0055] A method for using a non-equilibrium hydroxyl radical co-excitation device includes the following steps: S1. Flue gas introduction: The incineration flue gas, after deacidification and dust removal pretreatment, enters the Venturi jet mixing section 1 through the inlet flange; S2, Venturi jet mixing, creates a local negative pressure in the Venturi throat 7 region, driving HHO gas to be injected into the main gas flow through tangentially arranged micro-mist nozzles 9, forming a swirling structure to achieve micro-scale uniform mixing of the gas; it can prevent local hydrogen enrichment, improve gas-liquid / gas-gas mixing efficiency and reduce the risk of explosion. S3, Rectification and Temperature Flow: The mixed gas enters the honeycomb rectifier mesh 12 of the rectifier and stabilizer chamber 2 to eliminate turbulence and eddies; to achieve uniform flow velocity distribution; to prevent airflow from impacting the discharge tube; and to provide uniform flow field conditions for stable plasma discharge. S4. Plasma excitation: After the gas enters the DBD plasma reaction core chamber 3, it generates non-equilibrium plasma under the action of a high-frequency electric field. This plasma is used to rapidly dissociate HHO, generate high-density free radicals, and strengthen the reaction field. S5. Pollutant reaction explanation: The pollutants undergo the following processes in the reaction zone: dechlorination → ring opening → oxidation → mineralization, and are eventually converted into CO2, H2O and a small amount of inorganic acid (such as HCl). S6. Exhaust gas is discharged. The treated gas is discharged through the outlet and enters subsequent purification or directly meets emission standards.

[0056] Before starting the device, check the flange connection and sealing; check the integrity of the quartz discharge tube; check the electrical insulation and grounding status; calibrate the hydrogen concentration detection device; and confirm that the flame arrester and check valve 10 are working properly.

[0057] The startup sequence of the device is as follows: start the induced draft fan to establish a stable airflow; open the flue gas passage to form a negative pressure in the system; start the HHO gas supply (low flow start); start the high-voltage power supply to establish plasma discharge.

[0058] The voltage is 10–20 kV; the frequency is 10–30 kHz; the volume fraction of HHO is 5–10%; and the reaction temperature is ≤200℃.

[0059] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0060] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A non-equilibrium hydroxyl radical co-excitation device, characterized in that: The device includes a Venturi jet mixing section (1), a rectifier and stabilizer chamber (2), and a DBD plasma reaction core chamber (3) connected in sequence. The Venturi jet mixing section (1) is connected to the end away from the rectifier and stabilizer chamber (2) with combustion flue gas introduced. The Venturi jet mixing section (1) is connected to multiple HHO jet components for introducing HHO gas. The DBD plasma reaction core chamber (3) is arrayed with multiple discharge units. The DBD plasma reaction core chamber (3) is connected to the end away from the rectifier and stabilizer chamber (2) with a monitoring mechanism. The DBD plasma reaction core chamber (3) is connected to a high-voltage inlet port (4). The Venturi jet mixing section (1) includes an inlet section (5), a constriction section (6), a throat (7) and a diffusion section (8) arranged in sequence, with multiple HHO jet components equally spaced around the outside of the throat (7); The HHO spray assembly includes a micro-mist nozzle (9) connected to the throat (7). A one-way valve (10) is provided at one end of the micro-mist nozzle (9) away from the throat (7), and a miniature flame arrester (11) is provided at one end of the one-way valve (10) away from the micro-mist nozzle (9). The micro-mist nozzle (9) forms a 45° tangential angle with the airflow direction; The contraction angle of the contraction section (6) is 20°, and the diffusion angle of the diffusion section (8) is 12°.

2. The non-equilibrium hydroxyl radical synergistic excitation device according to claim 1, characterized in that: The rectifier and stabilizer chamber (2) is detachably connected to a honeycomb rectifier mesh (12).

3. The non-equilibrium hydroxyl radical synergistic excitation device according to claim 1, characterized in that: The discharge unit includes a central high-voltage electrode (13), a discharge gap (14), a dielectric barrier layer (15) and a grounding electrode (16) arranged sequentially from the inside to the outside. Insulating supports (17) are provided at both ends of the dielectric barrier layer (15).

4. The non-equilibrium hydroxyl radical synergistic excitation device according to claim 1, characterized in that: The monitoring device includes a temperature sensor (18) and multiple H2 concentration monitoring interfaces (19).

5. The non-equilibrium hydroxyl radical synergistic excitation device according to claim 1, characterized in that: The DBD plasma reaction core chamber (3) is equipped with an observation window (20).

6. The non-equilibrium hydroxyl radical synergistic excitation device according to claim 1, characterized in that: The spacing between two adjacent discharge units located at the same horizontal position is 60 mm.

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