VOCs waste gas electrolytic treatment system

Abstract

The VOCs waste gas electrolytic treatment system comprises a shell, a backflow mechanism is arranged in the middle of the shell in a penetrating mode, a plurality of cathode plates are fixed to the left side of the interior of a tank body, a plurality of anode plates are fixed to the right side of the interior of the tank body, and ultrasonic generators are arranged at the lower ends of the cathode plates and the anode plates; the electrode plate adopting the wing-shaped design not only provides a larger surface area, but also makes full use of the effects of vortex holes and ultrasonic waves; a complex flowing path can be formed on the surface, so that the waste gas can generate more sufficient mixing and convection on the surface of the electrode; and moreover, the vortex hole structure and the ultrasonic wave are mutually cooperated, so that VOCs molecules in the waste gas are more easily adsorbed and catalytically oxidized or reduced by the surface of the electrode. The vortex hole structure provides more adsorption sites, and mass transfer between waste gas molecules and the surface of the electrode can be promoted under the action of ultrasonic waves, so that the reaction rate is increased.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment, and in particular to a VOCs waste gas electrolysis treatment system. Background Art

[0002] VOCs (volatile organic compounds) are common organic compounds in industrial production, chemicals, coatings, printing, solvent use and other processes. Their volatilization and emission pose a potential threat to the environment and human health. The treatment and purification of VOCs waste gas has become one of the important topics in the field of environmental protection. Traditional VOCs waste gas treatment methods include adsorption, combustion, absorption, oxidation, etc., but there are problems such as low treatment efficiency, high energy consumption, and high treatment costs. Therefore, it is of great significance to seek an efficient, energy-saving, and environmentally friendly VOCs waste gas treatment technology.

[0003] With the development of electrochemical technology, electrochemical treatment of VOCs waste gas has become an emerging technology that has attracted much attention. Electrochemical treatment uses electric current to promote the oxidation and reduction reactions of VOCs between the anode and cathode, converting organic compounds into harmless substances. It has the advantages of high treatment efficiency, simple operation, and low cost. However, existing electrochemical treatment systems still have certain challenges and limitations in terms of treatment efficiency, stability, and equipment cost.

[0004] In response to these problems, the prior art has proposed some improvement plans, but there are still certain limitations. For example, the patent with publication number JP5790329B2 discloses a waste gas treatment device, which suppresses the generation of sediments in the cathode tank by designing the liquid stored in the cathode tank, and removes NOx from the waste gas at a low cost. However, it still has the following shortcomings: 1. Insufficient treatment efficiency: Affected by the surface area of ​​the electrode, it cannot provide sufficient reaction contact area, resulting in limited contact opportunities between the waste gas and the electrode, which limits the reaction. 2. Limited mass transfer: When the waste gas passes through the electrolytic cell, the mass transfer is limited due to the limited contact area between the waste gas and the electrode, which leads to low adsorption and reaction rate of VOCs molecules on the electrode surface, affecting the treatment efficiency. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a VOCs waste gas electrolysis treatment system, which solves the problems existing in the prior art. 1. This patent adopts symmetrically arranged wing-shaped anode plates and cathode plates, and arranges vortex holes and ultrasonic generators in arrays on their surfaces. This design can effectively increase the surface area of ​​the electrode, provide more reaction contact area, enhance the contact between VOCs molecules in the waste gas and the electrode, thereby improving the treatment efficiency. 2. Through the arrangement of vortex holes and ultrasonic generators, the use of ultrasonic generators can promote the turbulence and rotation effects of the waste gas, enhance the contact and mixing efficiency between the waste gas and the electrode, optimize the mass transfer between the waste gas and the electrode, and increase the adsorption and reaction rate of VOCs molecules on the electrode surface, thereby enhancing the treatment efficiency.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a VOCs waste gas electrolysis treatment system, comprising: a shell, a reflux mechanism is provided through the middle of the shell, a plurality of cathode plates are fixed on the left side of the tank body, a plurality of anode plates are fixed on the right side of the tank body, and an ultrasonic generator is provided at the lower ends of the cathode plates and the anode plates;

[0009] Preferably, the cathode plate and the anode plate are symmetrically arranged in the shape of fins, and a plurality of penetrating vortex holes are arranged in an array on their surfaces, and a hemispherical groove is arranged on the outer edge of the lower end of the vortex hole.

[0010] Preferably, the reflux mechanism comprises a reflux pipe penetrating through the axis of the shell, and separation wings are symmetrically arranged on both sides of the reflux pipe, and the separation wings are sealed and connected to the inner edge of the shell.

[0011] Preferably, an arc-shaped air inlet is provided at the lower right end of the return pipe, a return inlet is provided at the right upper end of the return pipe, and a return outlet is provided at the left lower end of the return pipe.

[0012] Preferably, a plurality of streamlined diverter strips are provided on the surface of the air inlet.

[0013] Preferably, an exhaust gas inlet is arranged at the bottom axis of the shell, and a gas outlet is arranged at the upper axis of the shell.

[0014] Preferably, the outer edges of the cathode plate and the anode plate are sealed to the inner edge of the shell.

[0015] Preferably, a filter screen is fixed to the upper end of the bottom of the shell.

[0016] Preferably, the lower end array of the shell is provided with reinforcing ribs, the bottom of the reinforcing ribs is provided with a water sealing ring, and the right side of the water sealing ring is provided with a water outlet valve.

[0017] Preferably, an inspection window is fixed to the middle portion of the outer side of the shell, and a pressure relief valve is fixed to the upper end of the outer side of the shell.

[0018] (III) Beneficial effects

[0019] The present invention aims to provide a VOCs waste gas electrolysis treatment system, which has the following beneficial effects:

[0020] 1. Optimize reaction kinetics: The electrode plate with airfoil design not only provides a larger surface area, making fuller use of the vortex holes and ultrasonic waves, but also forms a complex flow path on the surface, so that the exhaust gas can be more fully mixed and convected on the electrode surface. This helps to optimize the reaction kinetics, accelerate the mass transfer and reaction rate between the VOCs molecules in the exhaust gas and the electrode surface, and improve the selectivity of the reaction.

[0021] 2. Increase the contact area between the exhaust gas and the electrode: The vortex hole structure can form turbulence and eddy currents on the electrode surface, so that the exhaust gas can be more fully mixed and convected on the electrode surface, thereby increasing the contact area between the exhaust gas and the electrode. The effect of ultrasound can generate local vibration and pressure waves in the vortex hole area, further increasing the turbulence and rotation effect of the exhaust gas, making the exhaust gas and the electrode contact more closely.

[0022] 3. Promote mass transfer and reaction rate: The vortex hole structure and the effect of ultrasound work together to make VOCs molecules in the exhaust gas more easily adsorbed and catalytically oxidized or reduced by the electrode surface. The vortex hole structure provides more adsorption sites, and the effect of ultrasound can promote mass transfer between exhaust gas molecules and the electrode surface, speeding up the reaction rate.

[0023] 4. Optimize reaction conditions and enhance selectivity: The local vibration and pressure wave of ultrasonic waves can produce local temperature and pressure changes in the vortex hole area, optimize the reaction conditions between the exhaust gas and the electrode, and improve the selectivity of the reaction. This helps to reduce the occurrence of side reactions and improve the treatment effect and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the whole of the present invention.

[0025] Figure 2 It is a cross-sectional view of the shell in the present invention.

[0026] Figure 3 It is a cross-sectional view of the whole of the present invention.

[0027] Figure 4 It is a schematic diagram of the reflux mechanism in the present invention.

[0028] Figure 5 It is a cross-sectional view of the reflux pipe in the present invention.

[0029] Figure 6 Schematic diagram of the cathode plate in the present invention.

[0030] Figure 7 It is a cross-sectional view of the vortex hole in the present invention.

[0031] Figure 8 It is the flow diagram of the gas in the present invention.

[0032] In the figure: 1-shell 2-return mechanism 3-cathode plate 4-anode plate 5-ultrasonic generator 6-filter screen 7-water outlet valve 8-inspection window 9-pressure relief valve 11-exhaust gas inlet 12-gas outlet 13-reinforcement rib 14-sealing water ring 21-return pipe 22-separation wing 31-vortex hole 211-air inlet 212-return inlet 213-return outlet 214-dividing strip 311-groove DETAILED DESCRIPTION

[0033] The following will be combined with the attached examples of the present invention Figure 1-8 The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The present invention provides a technical solution: a VOCs waste gas electrolysis treatment system, comprising: a shell 1, a reflux mechanism 2 is provided through the middle of the shell 1, a plurality of cathode plates 3 are fixed on the left side of the inside of the tank 1, a plurality of anode plates 4 are fixed on the right side of the inside of the tank 1, an ultrasonic generator 5 is provided at the lower ends of the cathode plates 3 and the anode plates 4, and a filter screen 6 is fixed at the bottom upper end of the shell 1. A reinforcing rib 13 is provided in an array at the lower end of the shell 1, a water sealing ring 14 is provided at the bottom of the reinforcing rib 13, and a water outlet valve 7 is provided on the right side of the water sealing ring 14. An inspection window 8 is fixed in the middle of the outer side of the shell 1, and a pressure relief valve 9 is fixed at the upper end of the outer side of the shell 1.

[0035] The shell 1, as the shell of the entire device, plays the role of fixing and supporting the internal components, while preventing the exhaust gas from leaking and ensuring the safety of the treatment process. The reflux mechanism 2 is set throughout the middle of the shell to control the flow direction of the exhaust gas so that the exhaust gas can fully contact the anode plate and the cathode plate, thereby improving the exhaust gas treatment efficiency. The cathode plate 3 and the anode plate 4 are key components of the electrolysis reaction, responsible for catalytic oxidation or reduction of organic pollutants in the exhaust gas during the electrolysis process, and converting them into harmless products. The ultrasonic generator 5 can promote the mixing and mass transfer between the exhaust gas and the electrode plate by generating ultrasonic waves, improve the reaction rate and selectivity, and thus enhance the exhaust gas treatment efficiency. The filter 6 is located at the upper end of the bottom of the shell, and is used to preliminarily filter large particles, dust and other impurities in the exhaust gas, protect the internal components from damage, and ensure the stability and safety of the exhaust gas treatment. The reinforcing ribs 13 and the water sealing ring 14 are located at the lower end of the shell, and are used to strengthen the structural strength of the shell, prevent wastewater leakage, and keep the treatment process dry and clean. The outlet valve 7 is located on the right side of the water sealing ring at the lower end of the shell, and is used to discharge the wastewater generated during the treatment process to ensure that the wastewater is discharged in time and maintain the normal operation of the equipment. The inspection window 8 is located on the outside of the middle part of the shell, and is used to inspect and maintain the internal components to ensure the normal operation of the equipment. The pressure relief valve 9 is located on the outside of the upper end of the shell, and is used to discharge the pressure generated during the treatment process to ensure the safe operation of the equipment.

[0036] An exhaust gas inlet 11 is provided at the bottom axis of the shell 1, and a gas outlet 12 is provided at the upper axis of the shell 1. An exhaust gas inlet 11 is provided at the bottom axis of the shell 1, which is used to guide the gas containing VOCs exhaust gas into the interior of the treatment device. When the exhaust gas enters the interior of the device through the inlet 11, it is processed and converted by various components inside the treatment device. The treated gas is then discharged through the gas outlet 12 provided at the upper axis of the shell 1. The function of the gas outlet 12 is to discharge the treated gas out of the device so that the treated gas can be safely released into the environment, while ensuring the normal operation of the treatment device.

[0037] The reflux mechanism 2 includes a reflux pipe 21 that is arranged at the axis of the shell 1, and partition wings 22 are symmetrically arranged on both sides of the reflux pipe 21. The partition wings 22 are sealed and connected to the inner edge of the shell 1. The reflux mechanism 2 includes a reflux pipe 21 and partition wings 22. The reflux pipe 21 is arranged at the axis of the shell 1 to guide the flow of exhaust gas and control its flow direction. The partition wings 22 are symmetrically arranged on both sides of the reflux pipe 21. The function of these partition wings 22 is to play a role in diversion and diversion during the flow of exhaust gas, so that the exhaust gas can flow evenly to the anode plate and the cathode plate, thereby improving the contact efficiency between the exhaust gas and the electrode. The partition wings 22 are sealed and connected to the inner edge of the shell 1 to ensure that the exhaust gas will not leak into the external environment during the flow process, thereby maintaining the closedness and safety of the treatment process.

[0038] It should be noted that the reflux mechanism 2 is made of insulating material as a whole to ensure that the electrolysis reaction will not be affected during the exhaust gas treatment process. This design can effectively prevent current leakage or short circuit during the electrolysis process and ensure the stable progress of the electrolysis reaction. In addition, circuit pipes are provided in the partition wings 22 on both sides of the reflux mechanism 2 to connect the circuits of the cathode plate 3 and the anode plate 4. These circuit pipes play a role in conducting current, ensuring that the cathode plate and the anode plate can receive current normally, thereby realizing the electrolysis reaction. Such a design not only ensures the safety and stability of the device, but also improves the efficiency and reliability of the electrolysis reaction.

[0039] An arc-shaped air inlet 211 is provided at the lower right end of the return pipe 21, a return inlet 212 is provided at the right side of the upper end of the return pipe 21, and a return outlet 213 is provided at the left side of the lower end of the return pipe 21. The air inlet 211 is located at the lower right end of the return pipe 21, and is used to guide the exhaust gas from the bottom into the interior of the return pipe 21. The arc-shaped design of the air inlet 211 helps to smoothly guide the exhaust gas into the return pipe and avoid excessive diffusion and loss of the exhaust gas. The return inlet 212 is located at the right side of the upper end of the return pipe 21, and is used to guide the treated exhaust gas to flow back into the interior of the exhaust gas treatment device. Through the return inlet 212, the exhaust gas can enter the treatment device again for secondary treatment to ensure that the organic pollutants in the exhaust gas are thoroughly treated. The return outlet 213 is located at the left side of the lower end of the return pipe 21, and is used to discharge the treated wastewater. The wastewater generated during the treatment process is discharged from the return outlet 213 to avoid excessive accumulation of wastewater in the treatment device and maintain the normal operation of the device. The design of multiple streamlined diverter strips 214 on the surface of the air inlet 211 helps to optimize the flow of the exhaust gas, so that the exhaust gas can enter the recirculation pipe 21 evenly and avoid the situation where the local flow rate is too fast or too slow. These streamlined diverter strips 214 can cause the exhaust gas to produce a diversion effect in the process of entering the recirculation pipe, making the exhaust gas flow more evenly, reducing turbulence and eddy currents in the flow process, thereby reducing the energy loss and pressure loss of the exhaust gas. Such a design can improve the flow efficiency of the exhaust gas in the recirculation pipe, increase the contact area between the exhaust gas and the electrode, and thus improve the treatment efficiency and reaction selectivity of the exhaust gas.

[0040] The cathode plate 3 and the anode plate 4 are symmetrically arranged in the shape of fins, and a plurality of penetrating vortex holes 31 are arranged in an array on their surface. A hemispherical groove 311 is arranged on the outer edge of the lower end of the vortex hole 31. The design of the hemispherical groove 311 can further increase the contact area between the exhaust gas and the surface around the vortex hole.

[0041] The wing-shaped setting has the following functions: 1. Increasing the reaction surface area: The electrode plate with wing-shaped design provides a larger surface area, so that the effects of vortex holes and ultrasonic waves can be more fully utilized. This can further increase the contact area between the exhaust gas and the electrode, enhance the mass transfer between the VOCs molecules in the exhaust gas and the electrode, and improve the reaction efficiency. 2. Optimizing reaction kinetics: The electrode plate with wing-shaped design can form a complex flow path on the surface, so that the exhaust gas produces more complete mixing and convection on the electrode surface. This helps to optimize the reaction kinetics, accelerate the mass transfer and reaction rate between the VOCs molecules in the exhaust gas and the electrode surface, and improve the selectivity of the reaction.

[0042] The vortex hole 31 plays a key role in the electrolytic treatment system. The following is a detailed description of the role of the vortex hole: 1. Increase the contact area: The through-hole design of the vortex hole enables the exhaust gas to pass through the electrode plate and form turbulence and eddy effects in the hole. Such a design increases the contact area between the exhaust gas and the electrode surface, promotes the contact between the exhaust gas molecules and the catalyst on the electrode surface, and thus improves the reaction efficiency. 2. Enhance the mass transfer effect: The formation of turbulence and eddy currents in the vortex hole promotes the mixing and diffusion of the exhaust gas molecules in the hole, and accelerates the mass transfer rate between the exhaust gas molecules and the catalyst on the electrode surface. This effect of accelerating mass transfer helps to reduce the mass transfer resistance of the reactants, thereby increasing the reaction rate. 3. Optimize reaction conditions: The design of the vortex hole can improve the reaction environment, making the flow of the exhaust gas molecules in the hole more uniform and stable. By forming turbulence and eddy effects, the vortex hole can optimize the reaction conditions and improve the selectivity and efficiency of the reaction. 4. Promote exhaust gas mixing: The through-hole design of the vortex hole can effectively guide the exhaust gas molecules to the vicinity of the electrode surface and form a mixing effect in the hole. Such a mixing effect helps to fully expose the organic pollutants in the exhaust gas to the action of the catalyst on the electrode surface, thereby achieving efficient conversion of the organic pollutants.

[0043] The combined effect of wing-shaped electrode plates, eddy current holes and ultrasonic waves:

[0044] 1. Enhance the turbulence of exhaust gas: The effect of ultrasound can generate local high-frequency vibration around the vortex hole, thereby accelerating the flow of exhaust gas and enhancing the turbulence effect. This vibration and turbulence effect can effectively expose the organic pollutants in the exhaust gas to the electrode surface around the vortex hole, thereby improving the contact efficiency between the organic matter and the electrode surface.

[0045] 2. Promote mass transfer: Ultrasonic vibration can break the boundary layer around the exhaust gas molecules and accelerate the mass transfer process. When the exhaust gas molecules pass through the vortex holes, the vibration of the ultrasound can accelerate the mass transfer between the exhaust gas molecules and the catalyst on the electrode surface, thereby speeding up the reaction rate.

[0046] 3. Improve reaction efficiency: The vibration of ultrasound can eliminate bubbles and foam in the exhaust gas, prevent them from clogging the vortex holes, and more effectively transport organic pollutants in the exhaust gas to the electrode surface. This helps to improve the efficiency and selectivity of the reaction and promote the rapid conversion of organic matter in the exhaust gas.

[0047] 4. Optimize reaction conditions: Ultrasonic vibration can form local high-pressure and low-pressure areas around the vortex holes, thereby optimizing the conditions of the electrolytic reaction. This optimization effect helps to improve the stability and controllability of the reaction, thereby achieving efficient treatment of exhaust gas.

[0048] Overall, the wing-shaped design combined with the penetrating vortex holes and hemispherical grooves can maximize the contact area between the exhaust gas and the electrode, optimize the mixing and diffusion effects of the exhaust gas during the electrolysis process, and improve the exhaust gas treatment efficiency and reaction selectivity.

[0049] The working principle of the present invention can be specifically divided into the following stages:

[0050] 1. Preparation stage: Before the treatment begins, the anode plate 4 and cathode plate 3 are connected to the anode power supply and cathode power supply respectively. These power supplies provide the required current to provide energy for the electrolysis reaction. After that, the exhaust gas containing VOCs discharged from the factory is first sucked into the device and enters through the exhaust gas inlet 11 at the bottom of the shell. Before entering the main treatment area, the exhaust gas is first filtered through the filter screen 6 at the bottom to remove impurities such as large particulate matter and dust.

[0051] 2. Oxidation reaction stage: The exhaust gas enters the reflux mechanism 2 and is diverted into the right side of the housing 1 through the air inlet. Subsequently, the exhaust gas passes through the anode plate 4 and undergoes an oxidation reaction on the surface of its fin design, oxidizing the VOCs exhaust gas into harmless products such as water and carbon dioxide. The design of the anode plate 4 increases the contact area, which is conducive to improving the reaction efficiency.

[0052] When the exhaust gas reaches the vortex hole of the anode plate 4, the ultrasonic generator 5 generates ultrasonic waves, which are transmitted to the exhaust gas through the vortex hole 31, promoting the turbulence and rotation effect of the exhaust gas and increasing the contact and mixing efficiency with the anode plate 4. At the same time, the friction and vibration generated by the ultrasonic wave on the shape structure of the vortex hole 31 can cause the local temperature to rise, which helps to optimize the catalytic reaction conditions.

[0053] 3. Water discharge: The generated water is isolated by the water sealing ring 14 and discharged from the system through the water outlet valve 7.

[0054] 4. Reduction reaction stage: The exhaust gas after the oxidation reaction flows back to the bottom of the left side of the shell 1 through the reflux pipe 21, and gradually rises to enter the cathode plate 3 area for reduction reaction. In this stage, the oxidation products (such as aldehydes, ketones, acids and esters) in the exhaust gas are reduced to more stable, non-toxic or easy-to-handle compounds.

[0055] 5. Gas emission: After two reaction stages, the waste gas flows upward and is finally discharged out of the system through the gas outlet 12.

[0056] In summary, the present invention realizes efficient treatment of VOCs waste gas through reasonable design and technical application, and has the advantages of high treatment efficiency, simple operation and high safety.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A VOCs waste gas electrolysis treatment system, comprising: A shell (1), characterized in that a reflux mechanism (2) is provided through the middle of the shell (1), a plurality of cathode plates (3) are fixed on the left side of the interior of the tank (1), a plurality of anode plates (4) are fixed on the right side of the interior of the tank (1), and an ultrasonic generator (5) is provided at the lower ends of the cathode plates (3) and the anode plates (4); The cathode plate (3) and the anode plate (4) are symmetrically arranged in the shape of fins, and a plurality of penetrating vortex holes (31) are arranged in array on their surfaces, and a hemispherical groove (311) is arranged on the outer edge of the lower end of the vortex hole (31).

2. A VOCs waste gas electrolysis treatment system according to claim 1, characterized in that: The reflux mechanism (2) comprises a reflux pipe (21) penetrating the axis of the shell (1), with separation wings (22) symmetrically arranged on both sides of the reflux pipe (21), and the separation wings (22) are sealedly connected to the inner edge of the shell (1).

3. A VOCs waste gas electrolysis treatment system according to claim 2, characterized in that: The lower right end of the return pipe (21) is provided with an arc-shaped air inlet (211), the upper right end of the return pipe (21) is provided with a return inlet (212), and the lower left end of the return pipe (21) is provided with a return outlet (213).

4. A VOCs waste gas electrolysis treatment system according to claim 3, characterized in that: A plurality of streamlined flow dividing strips (214) are provided on the surface of the air inlet (211).

5. A VOCs waste gas electrolysis treatment system according to claim 1, characterized in that: An exhaust gas inlet (11) is arranged at the axis center of the bottom of the shell (1), and a gas outlet (12) is arranged at the axis center of the upper end of the shell (1).

6. A VOCs waste gas electrolysis treatment system according to claim 1, characterized in that: The outer edges of the cathode plate (3) and the anode plate (4) are sealed to the inner edge of the shell (1).

7. A VOCs waste gas electrolysis treatment system according to claim 1, characterized in that: A filter screen (6) is fixed to the upper end of the bottom of the housing (1).

8. A VOCs waste gas electrolysis treatment system according to claim 1, characterized in that: The lower end of the shell (1) is provided with reinforcing ribs (13) in an array, the bottom of the reinforcing ribs (13) is provided with a water sealing ring (14), and the right side of the water sealing ring (14) is provided with a water outlet valve (7).

9. A VOCs waste gas electrolysis treatment system according to claim 1, characterized in that: An inspection window (8) is fixed to the middle portion of the outer side of the shell (1), and a pressure relief valve (9) is fixed to the upper end of the outer side of the shell (1).

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