Electrolytic catalytic oxidation reactor

Abstract

The utility model discloses an electrolytic catalytic oxidation reactor, including groove body, dosing mechanism, electrolytic mechanism and aeration mechanism, and groove body is equipped with water inlet and water outlet. Dosing mechanism contains dosing storage tank, dosing pipeline, dosing pump and filter, and dosing storage tank is connected groove body through dosing pipeline, and dosing pump and filter are in proper order on dosing pipeline;Electrolytic mechanism includes electrode plate and filter frame, and electrode plate is placed in filter frame and is connected power supply, and filter frame is located in groove body;Aeration mechanism contains air pump, aeration main pipe and a plurality of aeration branch pipes, and aeration main pipe is connected air pump, and aeration branch pipe is inserted into groove body bottom and is equipped with aeration hole. The reactor degrades pollutant through electrode plate electrochemistry effect, and filter frame stabilizes electrode spacing, intercepts particulate matter and prolongs reaction time;Dosing mechanism accurately adds reagent and strengthens reaction;Aeration mechanism aeration stirring optimizes mass transfer and maintains electrode activity;The synergy of each part is suitable for the purification of refractory wastewater.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewage treatment equipment, specifically an electrolytic catalytic oxidation reactor. Background Technology

[0002] Produced water from oil and gas fields is the main wastewater generated during oil and gas extraction. Its composition is complex, containing pollutants such as crude oil, suspended solids, heavy metal ions (e.g., mercury, lead, cadmium), and recalcitrant organic compounds (e.g., phenols, polycyclic aromatic hydrocarbons). Direct discharge without proper treatment will not only pollute soil and groundwater but also damage the ecological environment and hinder the sustainable development of oil and gas fields. Currently, commonly used treatment technologies in the industry include physical separation, chemical oxidation, and biodegradation, but their effectiveness in removing high concentrations of recalcitrant pollutants is limited. With increasingly stringent environmental standards, there is an urgent need for efficient and stable treatment technologies to achieve compliant discharge or resource utilization of produced water. Electrolysis technology, due to its multiple functions including oxidation, reduction, and flocculation, has gradually become a research hotspot.

[0003] Among existing oil and gas field produced water treatment technologies, electrolysis has significant limitations: First, the electrode spacing is easily affected by water flow impact, leading to fluctuations in reaction efficiency, and the lack of particulate matter interception devices makes the electrodes susceptible to contamination or wear. Second, chemical dosing is mostly done manually or in a crude manner, making it difficult to dynamically adjust the dosage according to water quality, which can easily lead to chemical waste or incomplete reactions, especially with poor removal of recalcitrant organic matter. Third, the mass transfer efficiency is low, the water flow distribution in the reaction system is uneven, and insufficient aeration and stirring can lead to localized excessively strong or weak electrolysis reactions, easy scaling on the electrode surface, and decreased activity. Fourth, the various treatment units lack coordinated design, with filtration, electrolysis, chemical dosing, and aeration operating independently, making it difficult to adapt to complex water qualities and resulting in poor treatment stability.

[0004] A micro-electrolysis oxidation oilfield produced water treatment device is disclosed in patent application number CN202323265835.3, which mainly includes an electrolytic cell, electrode plates, and aeration components. This device degrades pollutants through the electrochemical action of the electrode plates, while simultaneously using an aeration device to improve reaction efficiency. However, this prior art has significant drawbacks: the lack of a filtration structure allows suspended particles in the produced water to directly contact the electrode plates, leading to electrode wear and reduced efficiency; the simple method of fixing the electrode plate spacing affects reaction stability; the dosing system uses a single pipeline, making it impossible to precisely control the reagent concentration and limiting the enhanced removal effect on recalcitrant organic matter; the uneven distribution of the aeration components results in low mass transfer efficiency, easily leading to scale buildup on the electrode surface, and the lack of synergistic effects between filtration, electrolysis, and dosing units makes it difficult to meet the treatment needs of highly challenging produced water. Utility Model Content

[0005] The purpose of this invention is to provide an electrolytic catalytic oxidation reactor to solve the following technical problems mentioned in the background art:

[0006] In existing oil and gas field produced water electrolysis treatment technologies, the lack of coordinated design among the various treatment units leads to poor adaptability to complex water qualities and insufficient stability of treatment effects.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An electrolytic catalytic oxidation reactor includes a tank, a dosing mechanism, an electrolysis mechanism, and a ventilation mechanism. The tank has an inlet and an outlet. The dosing mechanism includes a dosing tank, a dosing pipeline, a dosing pump, and a filter. The dosing tank is connected to the tank via the dosing pipeline, the dosing pump is located on the dosing pipeline, and the filter is located on the dosing pipeline between the dosing tank and the dosing pump. The electrolysis mechanism includes an electrode plate and a filter frame. The electrode plate is located within the filter frame, which is situated within the tank. The electrode plate is connected to a power source. The ventilation mechanism includes an air pump, a main ventilation pipe, and several branch ventilation pipes. Several branch ventilation pipes are connected to the main ventilation pipe, with one side extending into the bottom of the tank. Several ventilation holes are provided on the side of the branch ventilation pipe facing the tank.

[0009] Furthermore, the water inlet of the tank is located on the upper side of the tank, and the water outlet is located on the lower side of the tank, and the water inlet and the water outlet are not located on the same side.

[0010] Furthermore, the filter is a precision filter with a filtration accuracy of 0.1-5μm, and the filter is detachably connected to the dosing pipeline via a flange.

[0011] Furthermore, in the electrode plates, the positive electrode plate is made of titanium-based coated electrode, and the negative electrode plate is made of iron plate or aluminum plate, or both the positive and negative electrode plates are made of titanium-based coated electrode, and the number of electrode plates is 3-5 sets.

[0012] Furthermore, the filter frame adopts a mesh structure or a perforated plate structure, the pore diameter of the filter frame is 3-5mm, and the filter frame is slidably connected to the inner wall of the tank.

[0013] Furthermore, the filter frame is provided with slots, the two sides of the electrode plate are inserted into the slots, and the top of the electrode plate is provided with wiring terminals, which are connected to the positive and negative terminals of the external power supply through wires.

[0014] Furthermore, the number of ventilation branch pipes is 6-10, and the ventilation branch pipes are evenly distributed along the transverse direction of the tank, with the distance between the end of the ventilation branch pipe extending into the tank and the bottom of the tank being 10-20cm.

[0015] Furthermore, the vent holes have a diameter of 0.5-2mm and are arranged alternately along the length of the vent branch pipe, with the vent holes facing downwards at a 45° angle.

[0016] Furthermore, the inner wall of the tank is provided with an anti-corrosion layer, which is made of epoxy resin or polytetrafluoroethylene material and has a thickness of 0.5-2mm.

[0017] Furthermore, it also includes a mobile base, on which the tank, dosing tank, and air pump are all fixed. The bottom of the mobile base is equipped with casters with brakes.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In this invention, the electrode plates in the electrolysis mechanism directly or indirectly degrade pollutants and reduce heavy metals through electrochemical action; the filter frame stabilizes the electrode spacing, intercepts particulate matter, and disperses water flow to prolong the reaction time; the dosing mechanism precisely adds reagents to enhance the electrolysis reaction, assist in flocculation and sedimentation, and improve the removal effect of recalcitrant substances; the aeration mechanism optimizes mass transfer through aeration and stirring to make the reaction more uniform, flushes the electrodes to maintain their activity, and replenishes dissolved oxygen or provides oxidants; the tank acts as a reaction vessel to constrain the water flow path, and all parts work together to adapt to the purification of recalcitrant wastewater. Attached Figure Description

[0020] Figure 1 This is one of the overall structural schematic diagrams of this utility model;

[0021] Figure 2 This is the second schematic diagram of the overall structure of this utility model;

[0022] Figure 3 This is a partial structural diagram of the filter frame of this utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the tank in this utility model.

[0024] The markings in the diagram are: 1-tank body, 2-electrode plate, 3-filter frame, 4-main air pipe, 5-branch air pipe, 6-air pump, 7-drain outlet, 8-movable base, 9-dosing pipeline, 10-dosing pump, 11-filter, 12-dosing tank, 13-inlet, 14-slot. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example:

[0027] An electrolytic catalytic oxidation reactor, such as Figure 1 As shown, it includes a tank 1, a dosing mechanism, an electrolysis mechanism, and a ventilation mechanism; wherein, as Figure 2 As shown, the tank 1 is equipped with an inlet 13 and an outlet 7; the dosing mechanism includes a dosing tank 12, a dosing pipeline 9, a dosing pump 10, and a filter 11; the dosing tank 12 is connected to the tank 1 via the dosing pipeline 9, the dosing pump 10 is installed on the dosing pipeline 9, and the filter 11 is installed on the dosing pipeline 9 and located between the dosing tank 12 and the dosing pump 10; Figure 1 as well as Figure 3 As shown, the electrolysis mechanism includes an electrode plate 2 and a filter frame 3. The electrode plate 2 is disposed inside the filter frame 3, and the filter frame 3 is disposed inside the tank 1. The electrode plate 2 is connected to the power supply. The ventilation mechanism includes an air pump 6, a main ventilation pipe 4, and ventilation branch pipes 5. The main ventilation pipe 4 is connected to the air pump 6. Several ventilation branch pipes 5 are provided and are all connected to the main ventilation pipe 4. One side of the ventilation branch pipe 5 extends into the bottom side of the tank 1. Several ventilation holes are provided on the side of the ventilation branch pipe 5 located inside the tank 1.

[0028] Specifically, during use, the water to be treated enters from the inlet 13 of the tank 1. The dosing mechanism, based on the water quality requirements, adds the reagents from the dosing tank 12 to the tank 1 via the dosing pipeline 9 and the dosing pump 10 to mix with the water. In the electrolysis mechanism, the electrode plate 2 is powered on to form an electric field in the tank 1. The anode directly or indirectly oxidizes pollutants, and the cathode reduces pollutants. The filter frame 3 supports the electrode plate 2 and intercepts flocs generated during electrolysis. The aeration mechanism releases gas through the air pump 6, the main aeration pipe 4, and the branch pipes in the form of tiny bubbles to the bottom of the tank 1 through the vent holes, disturbing the water flow to ensure full contact between the water, reagents, and electrodes. At the same time, dissolved oxygen is replenished or oxidants are provided. The various mechanisms work together to ensure that the water is treated in the tank 1 through electrolytic catalytic oxidation, reagent-enhanced reaction, aeration, stirring, and mixing. The purified water is then discharged from the outlet 7.

[0029] In the electrolysis mechanism, electrode plates 2 utilize electrochemical action to directly or indirectly degrade pollutants and reduce heavy metals, while filter frames 3 stabilize the electrode spacing, intercept particulate matter, and disperse water flow to extend reaction time. The dosing mechanism precisely adds reagents to enhance the electrolysis reaction, assist in flocculation and sedimentation, and improve the removal effect of recalcitrant substances. The aeration mechanism optimizes mass transfer through aeration and stirring to make the reaction more uniform, flushes the electrodes to maintain their activity, and replenishes dissolved oxygen or provides oxidants. The tank 1 serves as a reaction vessel to constrain the water flow path. All parts work together to adapt to the purification of recalcitrant wastewater.

[0030] In a preferred embodiment, such as Figure 1As shown, the inlet 13 of the tank 1 is located on the upper side of the tank 1, and the outlet 7 is located on the lower side of the tank 1, and the inlet 13 and the outlet 7 are not located on the same side. The fact that the inlet 13 is on the upper side and the outlet 7 is on the lower side can prolong the residence time of the water in the tank 1, allowing the water to fully react with the electrode plate 2, the reagents, etc. At the same time, gravity is used to make the impurities after the reaction settle down, reducing the residue when discharged through the outlet 7, and improving the treatment effect.

[0031] In a preferred embodiment, filter 11 is a precision filter with a filtration accuracy of 0.1-5μm, and filter 11 is detachably connected to dosing pipeline 9 via a flange. The 0.1-5μm precision filtration can intercept fine impurities in the reagent, avoiding clogging of dosing pump 10 or affecting the reaction system. The detachable flange connection facilitates cleaning and replacement of filter 11, ensuring smooth dosing.

[0032] In a preferred embodiment, in electrode plate 2, the positive electrode plate is made of titanium-based coated electrode, and the negative electrode plate is made of iron or aluminum plate, or both the positive and negative electrode plates are made of titanium-based coated electrode. The number of electrode plates 2 is 3-5 groups. Titanium-based coated electrode has strong corrosion resistance and high catalytic activity. Iron / aluminum plates can generate flocs through electrocoagulation to assist in purification. The combination of 3-5 groups can enhance the intensity and uniformity of the electrolysis reaction and improve the pollutant removal efficiency.

[0033] In a preferred embodiment, such as Figure 3 As shown, the filter frame 3 adopts a mesh structure or a porous plate structure. The pore size of the filter frame 3 is 3-5mm, and the filter frame 3 is slidably connected to the inner wall of the tank 1. The mesh or porous plate structure can efficiently intercept impurities such as flocs generated by electrolysis, while not obstructing the flow of water and gas. The sliding connection design makes it easy to pull out the filter frame 3 for cleaning or replacement, ensuring the synergistic efficiency of filtration and electrolysis.

[0034] In a preferred embodiment, such as Figure 3 As shown, the filter frame 3 has slots 14, and the electrode plates 2 are inserted into the slots 14 on both sides. The top of the electrode plates 2 has terminals, which are connected to the positive and negative terminals of the external power supply via wires. The slots 14 are designed to facilitate quick installation and positioning of the electrode plates 2, ensuring stable electrode spacing. The top terminals are connected to the positive and negative terminals of the power supply via wires, allowing for precise control of electrode polarity and on / off states, thus improving the convenience and stability of equipment assembly, maintenance, and electrolysis operations.

[0035] In a preferred embodiment, such as Figure 4As shown, there are 6-10 ventilation branch pipes 5, which are evenly distributed along the transverse direction of the tank 1, and the distance between the end of the ventilation branch pipe 5 extending into the tank 1 and the bottom of the tank 1 is 10-20cm. The 6-10 ventilation branch pipes 5 evenly distributed laterally, combined with the depth of 10-20cm from the bottom of the tank, allow the gas to diffuse evenly within the tank 1, forming a comprehensive aeration and stirring effect, enhancing gas-liquid contact and mass transfer, and improving reaction uniformity and electrolysis efficiency.

[0036] In a preferred embodiment, the vent holes have a diameter of 0.5-2 mm and are staggered along the length of the vent branch pipe 5, with the vent holes facing downwards at a 45° angle. The staggered arrangement of the 0.5-2 mm diameter vent holes at a downwards at a 45° angle disperses the gas into fine bubbles, preventing bubbles from colliding and converging. At the same time, it obliquely washes away impurities deposited at the bottom of the tank, enhancing aeration uniformity and mass transfer efficiency, and reducing dead water zones.

[0037] In a preferred embodiment, the inner wall of the tank 1 is provided with an anti-corrosion layer, which is made of epoxy resin or polytetrafluoroethylene and has a thickness of 0.5-2mm. The 0.5-2mm thick epoxy resin or polytetrafluoroethylene anti-corrosion layer on the inner wall of the tank 1 can resist the erosion of corrosive substances in the electrolysis reaction, protect the structure of the tank 1, and extend the service life of the equipment.

[0038] In a preferred embodiment, the system also includes a movable base 8, on which the tank 1, the dosing tank 12, and the air pump 6 are all fixed. The bottom of the movable base 8 is equipped with casters with brakes. The movable base 8 integrates and fixes the tank 1, the dosing tank 12, and the air pump 6. The casters with brakes at the bottom facilitate flexible movement of the equipment to adapt to different work sites, while also allowing for easy positioning and ensuring operational stability.

[0039] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," 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 or an electrical connection; 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 utility model according to the specific circumstances.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electrolytic catalytic oxidation reactor, characterized in that: It includes a tank (1), a dosing mechanism, an electrolysis mechanism and a ventilation mechanism; wherein, the tank (1) is provided with an inlet (13) and an outlet (7); The dosing mechanism includes a dosing tank (12), a dosing pipeline (9), a dosing pump (10), and a filter (11); the dosing tank (12) is connected to the tank body (1) through the dosing pipeline (9), the dosing pump (10) is installed on the dosing pipeline (9), and the filter (11) is installed on the dosing pipeline (9) and located between the dosing tank (12) and the dosing pump (10); The electrolysis mechanism includes an electrode plate (2) and a filter frame (3). The electrode plate (2) is set inside the filter frame (3), and the filter frame (3) is set inside the tank (1). The electrode plate (2) is connected to the power supply. The ventilation mechanism includes an air pump (6), a main ventilation pipe (4), and a branch ventilation pipe (5). The main ventilation pipe (4) is connected to the air pump (6). Several branch ventilation pipes (5) are provided and are all connected to the main ventilation pipe (4). One side of the branch ventilation pipe (5) extends into the bottom side of the tank (1). Several ventilation holes are provided on the side of the branch ventilation pipe (5) located inside the tank (1).

2. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The inlet (13) of the tank (1) is located on the upper side of the tank (1), and the outlet (7) is located on the lower side of the tank (1), and the inlet (13) and the outlet (7) are not located on the same side.

3. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The filter (11) is a precision filter with a filtration accuracy of 0.1-5μm, and the filter (11) is detachably connected to the dosing pipeline (9) via a flange.

4. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: In the electrode plate (2), the positive electrode plate is made of titanium-based coated electrode, and the negative electrode plate is made of iron plate or aluminum plate, or both the positive and negative electrode plates are made of titanium-based coated electrode. The number of electrode plates (2) is 3-5 sets.

5. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The filter frame (3) adopts a mesh structure or a porous plate structure. The pore size of the filter frame (3) is 3-5mm, and the filter frame (3) is slidably connected to the inner wall of the tank (1).

6. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The filter frame (3) is provided with a slot (14), and the two sides of the electrode plate (2) are inserted into the slot (14). The top of the electrode plate (2) is provided with a wiring terminal, which is connected to the positive and negative poles of the external power supply through wires.

7. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The number of ventilation branch pipes (5) is 6-10. The ventilation branch pipes (5) are evenly distributed along the transverse direction of the tank (1), and the distance between the end of the ventilation branch pipe (5) extending into the tank (1) and the bottom of the tank (1) is 10-20cm.

8. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The vent holes have a diameter of 0.5-2mm and are staggered along the length of the vent branch pipe (5). The vent holes face downward at a 45° angle.

9. The electrolytic catalytic oxidation reactor according to claim 1, characterized in that: The inner wall of the tank (1) is provided with an anti-corrosion layer, which is made of epoxy resin or polytetrafluoroethylene material and has a thickness of 0.5-2mm.

10. An electrolytic catalytic oxidation reactor according to claim 1, characterized in that: It also includes a mobile base (8), a tank (1), a dosing tank (12), and an air pump (6), all of which are fixed on the mobile base (8). The bottom of the mobile base (8) is equipped with casters with brakes.

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