Three-dimensional electrode for electrolysis and electrolysis device

Abstract

The invention belongs to the technical field of electrolysis electrodes, and particularly relates to a three-dimensional electrode for electrolysis and an electrolysis device. The three-dimensional electrode for electrolysis comprises a first connecting piece and a first carbon fiber part, the first carbon fiber part is arranged on the periphery of the first connecting piece, the first carbon fiber part comprises a plurality of first carbon fiber groups, and each first carbon fiber group comprises a plurality of flexible carbon fiber units. The three-dimensional electrode for electrolysis can realize efficient electrolysis of sewage by promoting coalescence and precipitation of bubbles, and has a good application prospect in the field.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrolytic electrodes, and particularly relates to a three-dimensional electrode for electrolysis and an electrolysis device. Background Art

[0002] Electrochemical treatment is a commonly used sewage organic matter treatment technology, including electrocatalytic oxidation, electrocoagulation, electroflotation treatment, granular three-dimensional electrode treatment and other technologies. Although these several electrochemical treatment technologies can perform a certain degree of electrolytic treatment on sewage, they also have the following defects:

[0003] First, the cathodes of these several electrochemical treatment technologies generally use titanium or iron electrodes, and the hydrogen evolution reaction occurs on the surface, generating a large amount of H2. Therefore, problems such as bubbles being difficult to precipitate and dissolved hydrogen saturation are likely to occur, which will further hinder the contact between the electrode and the electrolyte, increase the mass transfer resistance, lead to concentration polarization overpotential, increase the electrode potential and cell voltage, and reduce the electrolysis efficiency.

[0004] Second, the granular three-dimensional electrode technology generally uses granular activated carbon or iron-carbon particles as particle electrodes, but most of the contacts during the reaction are short-circuit currents, and the electrolysis efficiency is low. To solve the short-circuit problem, a method of mixing granular three-dimensional electrodes with insulating ions is mostly used, but in actual use, the granular three-dimensional electrodes and insulating ions are easily washed and scoured by backwashing to form stratification, and there will still be problems of large short-circuit current and low electrolysis efficiency.

[0005] How to solve the problems of bubbles being difficult to precipitate, dissolved hydrogen saturation and large short-circuit current existing in the process of electrolytic treatment of sewage to achieve efficient electrolysis of sewage has become an urgent technical problem to be solved. Summary of the Invention

[0006] In view of some or all of the problems existing in the prior art, the present invention provides a three-dimensional electrode for electrolysis, a three-dimensional electrode, an electrolysis device and a device for electrolysis.

[0007] According to a first aspect of the present invention, there is provided a three-dimensional electrode for electrolysis.

[0008] The three-dimensional electrode for electrolysis includes:

[0009] A first connecting member; and

[0010] A first carbon fiber part, the first carbon fiber part is arranged around the first connecting member, and the first carbon fiber part includes a plurality of first carbon fiber groups, and each of the first carbon fiber groups includes a plurality of carbon fiber units with a certain flexibility,

[0011] Wherein, the three-dimensional electrode for electrolysis is configured to be able to electrolyze sewage.

[0012] As an extension of the above technical solution, the present invention also provides the following embodiments:

[0013] The first carbon fiber groups are arranged in sequence along the longitudinal direction of the first connecting member, and a certain distance is left between two adjacent first carbon fiber groups.

[0014] All the carbon fiber units within each first carbon fiber group are configured to be fixedly connected to the first connecting member.

[0015] The carbon fiber units within two adjacent first carbon fiber groups are configured to collide in response to the action of an external force.

[0016] All the carbon fiber units within at least part of the first carbon fiber groups are configured to be connected to the same section in the longitudinal direction of the first connecting member.

[0017] The carbon fiber units within at least part of the first carbon fiber groups are configured to be evenly distributed in the circumferential direction of the first connecting member.

[0018] It includes an annular mounting portion configured to be connected to the first connecting member. The annular mounting portion includes annular mounting groups corresponding in number to the number of the first carbon fiber groups. Each annular mounting group includes an inner ring made of an insulating material / conductive material and an outer ring made of a conductive material / insulating material. The first carbon fiber groups are configured to be connected to both the inner ring and the outer ring.

[0019] The annular mounting groups are configured to maintain a certain distance from each other and be able to sway in response to the action of an external force.

[0020] At least part of the carbon fiber units within the same annular mounting group are configured to be connected to the inner ring at the folding point after folding and to the outer ring with the two wings after folding.

[0021] The carbon fiber unit is configured to be strip-shaped or linear.

[0022] The carbon fiber unit is made of a carbon fiber material, and the carbon fiber material includes polyacrylonitrile-based carbon fiber.

[0023] According to the second aspect of the present invention, a three-dimensional electrode is also provided.

[0024] The three-dimensional electrode includes:

[0025] A second connecting member; and

[0026] A second carbon fiber part, which is configured to be woven outside the second connecting member and wind and extend along the longitudinal direction of the second connecting member.

[0027] Among them, the three-dimensional electrode is configured to be able to electrolyze sewage.

[0028] As an extension of the above technical solution, the present invention also provides the following embodiments:

[0029] The second carbon fiber part is configured to be repeatedly bent in its length direction, and several second carbon fiber groups connected end to end are formed. The second carbon fiber group includes a first bent section with an opening to the left and a second bent section with an opening to the right, and the lower part of the first bent section coincides with the upper part of the second bent section.

[0030] According to the third aspect of the present invention, an electrolysis device is provided.

[0031] The electrolysis device includes:

[0032] A first electrolysis tank, a first cathode plate and a first anode plate arranged inside the first electrolysis tank, and several non-touching three-dimensional electrodes for electrolysis as described above arranged between the first cathode plate and the first anode plate. The three-dimensional electrodes for electrolysis are connected to the first electrolysis tank through the first connecting piece and can electrolyze the sewage inside the first electrolysis tank.

[0033] As an extension of the above technical solution, the present invention also provides the following embodiments:

[0034] The external contour of the electrolysis tank is configured as a cuboid or a cylinder.

[0035] According to the fourth aspect of the present invention, a device for electrolysis is provided.

[0036] The device for electrolysis includes:

[0037] A second electrolysis tank, a second cathode plate and a second anode plate arranged inside the second electrolysis tank, and several non-touching three-dimensional electrodes as described above arranged between the second cathode plate and the second anode plate. The three-dimensional electrodes are connected to the second electrolysis tank through the second connecting piece and can electrolyze the sewage inside the second electrolysis tank.

[0038] The three-dimensional electrode for electrolysis according to the present invention utilizes a large number of carbon fiber units with a certain flexibility and conductive function to form a first carbon fiber group and a first carbon fiber part, and directly or indirectly connects the first carbon fiber part and the first connecting member to perform electrolysis treatment on sewage. Thanks to the structure of the carbon fiber unit and its flexible characteristics, on the one hand, the carbon fiber unit can swing appropriately under the action of water flow, thereby enhancing the turbulence of the sewage and promoting the collision of small bubbles with each other. On the other hand, the small bubbles adhering to the surface of the carbon fiber unit can also collide through the contact between the carbon fiber units. The collision between bubbles promotes the occurrence of bubble coalescence, and ultimately makes numerous small bubbles form large bubbles that are easily separated from the sewage. After the large bubbles are separated from the sewage, the dissolved amount of dissolved hydrogen in the sewage is reduced, thereby improving the electrolysis treatment efficiency of the sewage. Also thanks to the connection design of the first connecting member and the first carbon fiber part, when the three-dimensional electrode for electrolysis is subsequently placed in the electrolytic cell for electrolysis operation, a phenomenon similar to the stratification of granular three-dimensional electrodes and insulating particles will not occur, and by arranging multiple such three-dimensional electrodes in a non-contact manner, the situation of generating short-circuit current can be avoided, thereby further improving the efficiency of electrolyzing sewage.

[0039] For the three-dimensional electrode according to the present invention, first, through the special structure of the second carbon fiber part, the contact area between the second carbon fiber part and the sewage is increased, and the working efficiency of using this three-dimensional electrode for sewage electrolysis operation is improved. Second, also thanks to the design of the fixed connection between the second connecting member and the second carbon fiber part, when the three-dimensional electrode is subsequently placed in the electrolytic cell for electrolysis operation, a phenomenon similar to the stratification of granular three-dimensional electrodes and insulating particles will not occur, and by arranging multiple such three-dimensional electrodes in a non-contact manner, the situation of generating short-circuit current can be avoided, thereby further improving the efficiency of electrolyzing sewage.

[0040] The electrolysis device according to the present invention utilizes the three-dimensional electrode for electrolysis described above to achieve electrolysis treatment of sewage. Thanks to the many advantages of this three-dimensional electrode for electrolysis, this electrolysis device can achieve efficient electrolysis treatment of sewage.

[0041] The device for electrolysis according to the present invention utilizes the three-dimensional electrode described above to achieve electrolysis treatment of sewage. Thanks to the many advantages of this three-dimensional electrode, this device for electrolysis can achieve efficient electrolysis treatment of sewage. Brief Description of the Drawings

[0042] Figure 1 It is a schematic side structure diagram of an embodiment of the three-dimensional electrode for electrolysis according to the present invention;

[0043] Figure 2 is Figure 1 a top - view structural schematic diagram of a three - dimensional electrode for electrolysis in

[0044] Figure 3 a side - view structural schematic diagram of another embodiment of a three - dimensional electrode for electrolysis according to the present invention;

[0045] Figure 4 is Figure 3 a top - view structural schematic diagram of a three - dimensional electrode for electrolysis in

[0046] Figure 5 a side - view structural schematic diagram of a three - dimensional electrode according to the present invention;

[0047] Figure 6 a side - view structural schematic diagram of an embodiment of an electrolysis device according to the present invention;

[0048] Figure 7 a top - view structural schematic diagram of another embodiment of an electrolysis device according to the present invention.

[0049] All the drawings in the present invention are schematic diagrams for explaining structures and principles, and are not necessarily drawn according to actual sizes and proportions.

[0050] The specific meanings of the reference numerals in the drawings are as follows:

[0051] 1. First connecting member; 2. First carbon fiber part; 21. First carbon fiber group; 211. Carbon fiber unit; 3. Ring - shaped mounting part; 31. Ring - shaped mounting group; 311. Inner ring; 312. Outer ring; 4. Second connecting member; 5. Second carbon fiber part; 51. Second carbon fiber group; 511. First bending section; 512. Second bending section; 6. First electrolytic cell; 7. First cathode plate; 8. First anode plate; 100. Three - dimensional electrode for electrolysis; 200. Three - dimensional electrode; 300. Electrolysis device. Detailed Embodiments

[0052] The embodiments of the present invention will be described in more detail below with reference to the drawings.

[0053] According to the first aspect of the present invention, a three - dimensional electrode 100 for electrolysis is provided.

[0054] Figures 1 to 4Schematic diagram of the three-dimensional electrode 100 for electrolysis according to the present invention. As shown in the figure, the three-dimensional electrode 100 for electrolysis includes a first connecting member 1 and a first carbon fiber portion 2. The first connecting member 1 is made of a material with conductive properties, and its structure is linear, strip-shaped, etc., with a longitudinal dimension greater than the transverse dimension. Moreover, the first connecting member 1 is also configured to be connectable to an electrolysis device for electrolysis operations. The first carbon fiber portion 2 is disposed around the first connecting member 1. The first carbon fiber portion 2 includes a plurality of first carbon fiber groups 21, and each first carbon fiber group 21 contains a plurality of carbon fiber units 211 with a certain flexibility. The carbon fiber units 211 are made of carbon fiber materials, and the carbon fiber materials are preferably inorganic fibrous materials with a carbon content of more than 90%, such as polyacrylonitrile-based carbon fibers that meet this condition. The three-dimensional electrode 100 for electrolysis is integrally configured to be able to perform electrolysis treatment on sewage after being connected to the relevant electrolysis device.

[0055] During specific operations, the staff connects the three-dimensional electrode 100 for electrolysis to an appropriate position in the electrolysis device. Then, the sewage to be treated is introduced into the electrolysis device, and this sewage can serve as the electrolyte required for the electrolysis process. After the sewage is introduced, the staff starts the electrolysis device, so that the cathode and anode plates in the electrolysis device are in an energized state. The three-dimensional electrode 100 for electrolysis can also be charged under the action of the charged plates to perform electrolysis treatment operations on the sewage. For a more specific working process and principle, refer to the relevant description of the electrolysis device 300 in the following text.

[0056] Through this design, the three-dimensional electrode 100 for electrolysis with multiple first carbon fiber groups 21 and a large number of carbon fiber units 211 is obtained. The three-dimensional electrode 100 for electrolysis can be charged under the action of the charged plates to participate in the electrolysis operation of the sewage. Moreover, due to the characteristics of the carbon fiber units 211, such as a large number, dispersed arrangement, and certain flexibility, the carbon fiber units 211 can swing appropriately under the action of the water flow, thereby enhancing the turbulence of the sewage and promoting the occurrence of collisions between small bubbles. The collisions between the bubbles promote the occurrence of bubble coalescence, and ultimately, numerous small bubbles form large bubbles that are easily separated from the sewage. After the large bubbles are separated from the sewage, the dissolved amount of dissolved hydrogen in the sewage is reduced, thereby improving the electrolysis treatment efficiency of the sewage.

[0057] In an embodiment of the present invention, the carbon fiber unit 211 is configured to have a smooth surface. Through this design, the three-dimensional electrode 100 for electrolysis has the property of being not easily adsorbed by pollutants, so that the three-dimensional electrode 100 for electrolysis has a long service life and good renewability.

[0058] As Figure 1 and Figure 3As shown, in an embodiment of the present invention, the first carbon fiber groups 21 are arranged in sequence along the longitudinal direction of the first connecting member 1, and a certain distance is left between two adjacent first carbon fiber groups 21. Through this design, the three-dimensional electrode 100 for electrolysis presents a discontinuous structure, thus providing a relatively wide space for the swinging of the carbon fiber units 211 on the first carbon fiber groups 21, further promoting the turbulence of sewage under the action of the carbon fiber units 211 and the collision of small bubbles, and ultimately contributing to the improvement of the electrolysis efficiency.

[0059] As Figure 1 and Figure 3 As shown, in an embodiment of the present invention, all the carbon fiber units 211 within each first carbon fiber group 21 are configured to be fixedly connected to the first connecting member 1. Through this design, on the one hand, the firmness of the connection between the carbon fiber units 211 and the first connecting member 1 is enhanced, thus improving the structural stability of the three-dimensional electrode 100 for electrolysis. On the other hand, when the three-dimensional electrode 100 for electrolysis is subsequently placed in an electrolysis device for electrolysis operation, a phenomenon similar to the delamination of granular three-dimensional electrodes and insulating particles will not occur, and combined with the non-contact setting method of multiple such three-dimensional electrodes 100 for electrolysis, the situation of generating short-circuit current can be avoided, thereby further improving the efficiency of electrolytic treatment of sewage.

[0060] In a specific embodiment of the present invention, all the carbon fiber units 211 within each first carbon fiber group 21 are configured to be fixedly connected to the first connecting member 1 through one end.

[0061] In a specific embodiment of the present invention, all the carbon fiber units 211 within each first carbon fiber group 21 are configured to be fixedly connected to the first connecting member 1 through the middle part.

[0062] In a specific embodiment of the present invention, the carbon fiber units 211 within each carbon fiber group 21 are configured to be fixedly connected to the first connecting member 1 either through one end or through the middle part.

[0063] In an embodiment of the present invention, the carbon fiber units 211 within two adjacent first carbon fiber groups 21 are configured to be able to collide in response to the action of an external force. Through this design, the carbon fiber units 211 within two adjacent first carbon fiber groups 21 can collide and come into contact under the disturbance of water flow or the action of other external forces, thereby generating a reaction current during the collision to produce a micro-electrolysis effect, accelerating the treatment speed of sewage and improving the treatment efficiency of sewage. And this collision also helps to improve the coalescence and precipitation of the bubbles generated by the electrolysis reaction, further improving the sewage treatment efficiency.

[0064] In a specific embodiment of the present invention, the distance between two adjacent first carbon fiber groups 21 is less than twice the length of the carbon fiber unit 211.

[0065] In a specific embodiment of the present invention, the carbon fiber unit 211 forms a certain angle with the longitudinal direction of the first connecting member 1, so as to reduce the difficulty of the carbon fiber units 211 in two adjacent first carbon fiber groups 21 colliding under the action of an external force, and further improve the electrolysis efficiency of the three-dimensional electrode 100 for electrolysis.

[0066] In an embodiment of the present invention, all the carbon fiber units 211 in at least part of the first carbon fiber groups 21 are configured to be connected to the same section in the longitudinal direction of the first connecting member 1. Through this design, there is only one layer of carbon fiber units 211 arranged at the same longitudinal height in at least part of the first carbon fiber groups 21, which saves the use of the carbon fiber units 211 and makes the three-dimensional electrode 100 for electrolysis have better economy.

[0067] In an embodiment of the present invention, in order to be able to treat sewage more uniformly and improve the quality of sewage treatment, the carbon fiber units 211 in at least part of the first carbon fiber groups 21 are configured to be uniformly distributed in the circumferential direction of the first connecting member 1.

[0068] As Figure 3 and Figure 4 shown, in an embodiment of the present invention, the three-dimensional electrode 100 for electrolysis includes an annular mounting portion 3 configured to be connected to the first connecting member 1. The annular mounting portion 3 includes annular mounting groups 31 corresponding in number to the first carbon fiber groups 21 and arranged in sequence along the longitudinal direction of the first connecting member 1. The annular mounting group 31 includes an inner ring 311 and an outer ring 312, and each first carbon fiber group 21 is configured to be connected to both the inner ring 311 and the outer ring 312 in the corresponding annular mounting group 31. The inner ring 311 and the outer ring 312 are made of materials with significantly different electrical conductivity, that is, when the inner ring 311 is made of an insulating material, the outer ring 312 is made of a conductive material; or when the inner ring 311 is made of a conductive material, the outer ring 312 is made of an insulating material. In addition, it should be noted that the connection manner between the annular mounting portion 3 and the first connecting member 1 is not limited and can be any form of connection such as welding, and the connection state between the two is not shown in Figure 3 and Figure 4 . Through this design, a proper positioning effect is exerted on the carbon fiber units 211, and an alternating arrangement of conductors and insulators is formed in the plane-like space jointly defined by the inner ring 311 and the outer ring 312, which can increase the potential difference between the carbon fiber units 211 and the electrolyte, increase the reaction current, and ultimately achieve the purpose of improving the electrolysis efficiency.

[0069] In one embodiment of the present invention, the annular mounting group 31 is configured to be perpendicular to the longitudinal direction of the first connecting member 1.

[0070] In one embodiment of the present invention, the inner ring 311 and the outer ring 312 in the annular mounting group 31 are configured as a concentric ring structure.

[0071] In one embodiment of the present invention, the first connecting member 1 is disposed through the common center of the inner ring 311 and the outer ring 312.

[0072] In one embodiment of the present invention, the insulating materials for making the inner ring 311 and the outer ring 312 are plastics, rubbers, etc., and the conductive materials for making the inner ring 311 and the outer ring 312 are metals, carbon fibers, etc.

[0073] In one embodiment of the present invention, the annular mounting group 31 is configured to maintain a certain distance from each other, and by means of a connection method that maintains a certain movement space with the first connecting member 1, such as a binding connection method, etc., it is configured to be able to shake in response to external forces such as the disturbance of water flow. Through this design, on the one hand, it helps to make the small bubbles with larger kinetic energy generated on the carbon fiber unit 211 coalesce into large bubbles through mutual collision, and the large bubbles are more likely to break compared to the small bubbles, thereby reducing the dissolved amount of dissolved hydrogen in the sewage, enhancing the micro-electrolysis effect of the three-dimensional electrode 100 for electrolysis, and improving the working efficiency of electrolytic treatment of sewage using the three-dimensional electrode 100 for electrolysis. On the other hand, the shakeable annular mounting group 31 can drive the first carbon fiber group 21 connected thereto to shake, thereby promoting the collision of the carbon fiber units 211 in the first carbon fiber group 21 at adjacent positions to generate a micro-electrolysis effect, accelerating the treatment speed of the sewage, and improving the treatment efficiency of the sewage.

[0074] Such as Figure 4 As shown, for the purpose of efficiently using the carbon fiber unit 211 for electrolysis, in one embodiment of the present invention, at least some of the carbon fiber units 211 within the same annular mounting group 31 are configured to be connected to the inner ring 311 at the folding point after folding, and the two wings after folding are connected to the outer ring 312.

[0075] In one embodiment of the present invention, in order to increase the specific surface area of the carbon fiber unit 211 and improve the ability of the carbon fiber unit 211 to carry out electrolysis reactions, the carbon fiber unit 211 is configured as a strip or a wire. When the carbon fiber unit 211 is configured as a strip, it has a rectangular cross-section. When the carbon fiber unit 211 is configured as a wire, it has a circular cross-section.

[0076] Preferably, the carbon fiber unit 211 is configured to be linear. When the carbon fiber unit 211 is linear, it is easier to change its flexibility, which is more conducive to promoting the coalescence of microbubbles, and further more beneficial to achieving the purpose of promoting the rapid discharge of bubbles and improving the electrolysis efficiency.

[0077] Preferably, the length of the carbon fiber unit 211 ranges from 3 to 6 cm.

[0078] Preferably, the cross-sectional diameter or the maximum length in the cross-section of the carbon fiber unit 211 ranges from 1 to 10 μm.

[0079] According to the second aspect of the present invention, a three-dimensional electrode 200 is provided.

[0080] Figure 5 FIG. is a schematic structural diagram of the three-dimensional electrode 200 according to the present invention. As shown in the figure, the three-dimensional electrode 200 includes a second connecting member 4 and a second carbon fiber portion 5. The second carbon fiber portion 5 is configured to be woven outside the second connecting member 4 and extends along the longitudinal direction of the second connecting member 4. Among them, the second connecting member 4 is made of a material with conductive properties, and the preferred material is an elastomer with good conductivity. The second carbon fiber portion 5 is made of a carbon fiber material. The carbon fiber material is preferably an inorganic fibrous material with a carbon content of more than 90%, such as polyacrylonitrile-based carbon fiber that meets this condition.

[0081] During specific operations, the staff connects the three-dimensional electrode 200 to an appropriate position of the electrolysis device. After introducing the sewage to be treated into the electrolysis equipment, the power supply is turned on so that the cathode and anode plates in the electrolysis equipment are in an energized state. The three-dimensional electrode 200 can also be charged under the action of the charged electrode plates to achieve the electrolysis treatment of the sewage. For a more specific working process and principle, refer to the relevant description of the device for electrolysis in the following text.

[0082] Through this design, the three-dimensional electrode 200 can be charged under the action of the charged electrode plates to participate in the electrolysis operation of the sewage. Moreover, the second carbon fiber portion 5 is configured to be wound around the second connecting member 4. On the one hand, it increases the overall length of the second carbon fiber portion 5 and the contact area with the sewage, thereby improving the electrolysis treatment efficiency of the three-dimensional electrode 200 for the sewage. On the other hand, when the three-dimensional electrode 200 is subsequently placed in the electrolysis equipment for electrolysis operation, it will not occur the phenomenon similar to the stratification of particulate three-dimensional electrodes and insulating particles. And combined with the setting method of arranging multiple such three-dimensional electrodes 100 without contact with each other, the situation of generating short-circuit current can be avoided, thereby further improving the efficiency of electrolysis treatment of sewage.

[0083] Such as Figure 5As shown, in an embodiment of the present invention, the second carbon fiber part 5 is configured to be repeatedly bent in its length direction, and a number of second carbon fiber groups 51 connected end to end are formed. The second carbon fiber group 51 includes a first bent section 511 with an opening to the left and a second bent section 512 with an opening to the right, and the lower part of the first bent section 511 coincides with the upper part of the second bent section 512. Through this design, the structural form of the second carbon fiber part 5 outside the second connecting part 4 is further clarified, and the contact area between the second carbon fiber part 5 and the sewage is increased, thereby further improving the electrolysis efficiency of the sewage.

[0084] Further, as Figure 5 shown, in an embodiment of the present invention, the second connecting part 4 is configured to be repeatedly bent in its length direction to facilitate the winding of the second carbon fiber part 5. Through this design, the covering length of the second carbon fiber part 5 is increased within a certain longitudinal dimension, thereby increasing the contact area between the three-dimensional electrode 200 and the sewage, and further improving the electrolysis efficiency of the three-dimensional electrode 200 for the sewage.

[0085] According to the third aspect of the present invention, an electrolysis device 300 is provided.

[0086] Figure 6 and Figure 7 is a schematic structural diagram of the electrolysis device 300 according to the present invention. As shown, the electrolysis device 300 includes a first electrolytic cell 6, a first cathode plate 7 and a first anode plate 8 disposed inside the first electrolytic cell 6, and a number of non-contact three-dimensional electrodes 100 for electrolysis as described above disposed between the first cathode plate 7 and the first anode plate 8. A first water inlet (not shown, the same below) is provided at the bottom of the first electrolytic cell 6, and a first water outlet (not shown, the same below) is provided at the top of the first electrolytic cell 6. The three-dimensional electrode 100 for electrolysis is connected to the first electrolytic cell 6 through a first connecting part 1 and can electrolyze the sewage inside the first electrolytic cell 6.

[0087] During specific operation, the staff turns on the electrolysis device 300 and passes sewage into the first electrolytic cell 6 through the first water inlet. After the sewage fills the first electrolytic cell 6, it flows out through the first water outlet. The three-dimensional electrode 100 for electrolysis can carry out electrolysis operation in this environment.

[0088] With this design, on the one hand, during the electrolysis process, a large number of bubbles will be generated on the surface of the first cathode plate 7. When the sewage containing a large number of fine bubbles flows, it passes through the three-dimensional electrode 100 for electrolysis. The presence of the three-dimensional electrode 100 for electrolysis will increase the fluid turbulence effect, causing the fine bubbles to collide and further coalesce into large bubbles, realizing the rapid separation of the fine bubbles. On the other hand, when the first cathode plate 7 and the first anode plate 8 are energized, the carbon fiber unit 211 in the three-dimensional electrode 100 for electrolysis is inductively charged. An anodic reaction occurs in the three-dimensional electrode 100 for electrolysis near the first anode plate 8, and a cathodic reaction occurs in the three-dimensional electrode 100 for electrolysis near the first cathode plate 7, thus forming many micro-cells. The first connecting member 1 with good conductivity can reduce the resistance between the micro-cells. The organic pollutants in the sewage can undergo oxidation-reduction reactions on the surface of the carbon fiber unit 211. Compared with the plate electrode, the contact area between the pollutants and the electrode is greatly increased, thus greatly improving the treatment efficiency of the sewage. In addition, due to the characteristics that the first carbon fiber part 2 in the three-dimensional electrode 100 for electrolysis is directly or indirectly connected to the first connecting member 1 and the fact that there is a certain distance between different three-dimensional electrodes 100 for electrolysis arranged inside the first electrolytic cell 6, the three-dimensional electrode 100 for electrolysis will not occur the situation similar to the stratification of the granular three-dimensional electrode and the insulating particles, and the three-dimensional electrodes 100 for electrolysis do not contact each other, thus avoiding the occurrence of a large short-circuit current due to the mutual contact between different three-dimensional electrodes 100 for electrolysis, and further improving the electrolysis efficiency and operation safety of the electrolysis device 300.

[0089] As Figure 6 shown, in an embodiment of the present invention, the outer contour of the first electrolytic cell 6 is configured as a cuboid. The first cathode plate 7 and the first anode plate 8 are oppositely arranged in the first electrolytic cell 6, and the first cathode plate 7 and the first anode plate 8 are also configured to be parallel to the side walls of the first electrolytic cell 6. The three-dimensional electrode 100 for electrolysis is disposed at a position between the first cathode plate 7 and the first anode plate 8, and is arranged in multiple rows and multiple columns without contacting each other. The first connecting member 1 of the three-dimensional electrode 100 for electrolysis is configured to be connected to the top surface and the bottom surface of the first electrolytic cell 6 and is arranged parallel to the side walls of the first electrolytic cell 6.

[0090] As Figure 7As shown, in an embodiment of the present invention, the outer contour of the first electrolytic cell 6 is configured as a cylinder. Inside the first electrolytic cell 6, a first cathode plate 7 and a first anode plate 8, both of which are in the shape of a circular tube, are provided. And the outer diameter of the first cathode plate 7 is configured to be larger than the outer diameter of the first anode plate 8. The first cathode plate 7 and the first anode plate 8 are configured such that their central axes are parallel or coincident with the central axis of the first electrolytic cell 6, and the first anode plate 8 is disposed inside the first cathode plate 7. A plurality of three-dimensional electrodes 100 for electrolysis are uniformly arranged in the annular space between the first cathode plate 7 and the first anode plate 8. The three-dimensional electrodes 100 for electrolysis are arranged in a non-contact manner with each other, and the first connecting member 1 in the three-dimensional electrodes 100 for electrolysis is configured to be connected to the top and bottom of the first electrolytic cell 6.

[0091] According to a fourth aspect of the present invention, there is provided a device for electrolysis.

[0092] The device for electrolysis includes a second electrolytic cell, a second cathode plate and a second anode plate disposed inside the second electrolytic cell, and a plurality of non-contact three-dimensional electrodes 200 as described above disposed between the second cathode plate and the second anode plate. A second water inlet is provided at the bottom of the second electrolytic cell, and a second water outlet is provided at the top of the second electrolytic cell. The three-dimensional electrodes 200 are connected to the second electrolytic cell through a second connecting member 4 and can electrolyze the sewage inside the second electrolytic cell. It should be noted that the device for electrolysis is not shown in the drawings. The specific structures and configurations of components such as the second electrolytic cell, the second cathode plate, the second anode plate, the second water inlet, and the second water outlet can all be set with reference to the electrolysis device 300. That is, the difference between this device for electrolysis and the electrolysis device 300 is that the three-dimensional electrode 100 for electrolysis in the electrolysis device 300 is replaced with the three-dimensional electrode 200. Those skilled in the art can obtain the specific structure of the device for electrolysis with reference to the electrolysis device 300 and this paragraph description.

[0093] During specific operation, the staff turns on the device for electrolysis and passes sewage into the second electrolytic cell through the second water inlet. After the sewage fills the second electrolytic cell, it flows out through the second water outlet. The three-dimensional electrodes 200 can perform electrolysis operations in such an environment.

[0094] With this design, on the one hand, the characteristic that the three-dimensional electrode 200 has a large contact area with the sewage is utilized, improving the electrolysis efficiency of the sewage. On the other hand, when the second cathode plate and the second anode plate are energized, the second carbon fiber part 5 in the three-dimensional electrode 200 is inductively charged. An anodic reaction occurs in the three-dimensional electrode 200 close to the second anode plate, and a cathodic reaction occurs in the three-dimensional electrode 200 close to the second cathode plate, thus forming many micro-cells. The second connecting piece 4 with good conductivity can reduce the resistance between the micro-cells. The organic pollutants in the sewage can undergo oxidation-reduction reactions on the surface of the second carbon fiber part 5. Compared with the plate electrode, the contact area between the pollutants and the electrode is greatly increased, thus greatly improving the treatment efficiency of the sewage. On the other hand, due to the characteristic that the second carbon fiber part 5 in the three-dimensional electrode 200 is fixedly connected to the second connecting piece 4 and the fact that there is a certain distance between different three-dimensional electrodes 200 arranged inside the second electrolytic cell, the three-dimensional electrode 200 will not occur in a situation similar to the stratification of granular three-dimensional electrodes and insulating particles, and the three-dimensional electrodes 200 do not contact each other, thus avoiding the occurrence of a situation where a large short-circuit current is generated due to the mutual contact between different three-dimensional electrodes 200, thereby further improving the electrolysis efficiency and operation safety of the device for electrolysis.

[0095] The present invention will be described below with reference to more specific embodiments.

[0096] First of all, it should be noted that the sewage treated in this series of embodiments is produced water from gas fields, with an initial COD value of about 1500 mg / L and a TOC value C 0＝ of 450 mg / L in the initial wastewater. Through GC-MS analysis, macromolecular nitrogen-containing substances such as nitrogen heterocyclic compounds such as methyl / ethyl pyridine account for 37.2 wt% of the total amount and are important components constituting ammonia nitrogen and COD in the sewage; secondly, chlorinated compounds such as chlorotoluene (29.5 wt%) are also important components of COD, and there are also some oxygen-containing compounds such as phenols, alcohols, and acids (23.3 wt%).

[0097] Example 1:

[0098] Adopt as Figure 6The electrolysis device 300 shown treats sewage. In the electrolysis device 300, the length and width dimensions of the first cathode plate 7 and the first anode plate 8 are both 50 cm. The three-dimensional electrode 100 for electrolysis is of a type that does not include a ring-shaped mounting portion 3. The number of three-dimensional electrodes 100 for electrolysis between the first cathode plate 7 and the first anode plate 8 is 20. In each three-dimensional electrode 100 for electrolysis, 20 groups of first carbon fiber groups 21 are provided. The length of the carbon fiber unit 211 is set to 5 cm, and the distance between two adjacent first carbon fiber groups 21 is 2 cm. The first connecting member 1 is a conductor and can be selected to be made of iron-carbon material. The current applied between the first cathode plate 7 and the first anode plate 8 is 100 mA, and the voltage is 7.5 V. The sewage is batch-treated and enters the electrolysis device 300. The treatment time is 6 h. After 6 h, the COD removal rate is measured to be 80%.

[0099] Example 2:

[0100] Using the electrolysis device 300 as shown Figure 6 to treat sewage. In the electrolysis device 300, the length and width dimensions of the first cathode plate 7 and the first anode plate 8 are both 50 cm. The three-dimensional electrode 100 for electrolysis is of a type that includes a ring-shaped mounting portion 3, and the diameter of the outer ring 312 is 4 cm. The number of three-dimensional electrodes 100 for electrolysis between the first cathode plate 7 and the first anode plate 8 is 20. In each three-dimensional electrode 100 for electrolysis, 20 groups of ring-shaped mounting groups 31 and 20 groups of first carbon fiber groups 21 are provided. The length of the carbon fiber unit 211 is set to 6 cm, and it is set at the folding point after being folded in half on the inner ring 311, and the two wings after folding are fixed to the ring-shaped mounting group 31 in a manner connected to the outer ring 312. The distance between two adjacent first carbon fiber groups 21 is 2 cm. The first connecting member 1 is a conductor and can be selected to be made of iron-carbon material. The current applied between the first cathode plate 7 and the first anode plate 8 is 100 mA, and the voltage is 8.8 V. The sewage is batch-treated and enters the electrolysis device 300. The treatment time is 6 h. After 6 h, the COD removal rate is measured to be 75%.

[0101] Example 3:

[0102] Using an electrolysis device to treat sewage. In the electrolysis device, the length and width dimensions of the second cathode plate and the second anode plate are both 50 cm. The three-dimensional electrode 200 is used in the electrolysis device. The diameter of each three-dimensional electrode 200 is 5 cm. There are 20 three-dimensional electrodes 200 provided in the electrolysis device, and the distance between two adjacent three-dimensional electrodes 200 is 2 cm. The current applied between the second cathode plate and the second anode plate is 100 mA, and the voltage is 7 V. The sewage is batch-treated and enters the electrolysis device. The treatment time is 6 h. After 6 h, the COD removal rate is measured to be 77%.

[0103] Comparative Example 1:

[0104] The first electrolytic cell 6 as shown in Figure 6 is used to treat sewage. The length and width dimensions of the first cathode plate 7 and the first anode plate 8 in the first electrolytic cell 6 are both 50 cm. Granular three-dimensional electrodes are placed in the first electrolytic cell 6 for electrolytic treatment of sewage. The granular three-dimensional electrodes are made of iron-carbon particles with a diameter of 1 cm, filling the space between the first cathode plate 7 and the first anode plate 8. The current applied between the first cathode plate 7 and the first anode plate 8 is 100 mA, and the voltage is 5 V. The sewage is treated in batches and enters the first electrolytic cell 6. The treatment time is 6 h, and the COD removal rate is measured to be 60% after 6 h.

[0105] Comparative Example 2:

[0106] The first electrolytic cell 6 as shown in Figure 6 is used to treat sewage. The length and width dimensions of the first cathode plate 7 and the first anode plate 8 in the first electrolytic cell 6 are both 50 cm. Granular three-dimensional electrodes are placed in the first electrolytic cell 6 for electrolytic treatment of sewage. The granular three-dimensional electrodes are made of iron-carbon particles with a diameter of 1 cm, and the granular three-dimensional electrodes are arranged in a series connection manner in the first electrolytic cell 6, and the granular three-dimensional electrodes do not contact each other. The current applied between the first cathode plate 7 and the first anode plate 8 is 100 mA, and the voltage is 9 V. The sewage is treated in batches and enters the first electrolytic cell 6. The treatment time is 6 h, and the COD removal rate is measured to be 65% after 6 h.

[0107] In addition, after analyzing the composition of the effluents in Examples 1 to 3 and Comparative Examples 1 to 2 by GC-MS, it can be obtained that the COD in the effluents of Examples 1 to 3 is mainly composed of nitrogen-containing heterocyclic compounds such as pyridine, and there are also a small amount of halogenated benzene series chlorine-containing compounds. In the effluents of Comparative Examples 1 to 2, in addition to the above two substances, there are also oxygen-containing compounds such as long-chain alcohols and acids.

[0108] From the data and related analysis of Examples 1 to 3 and Comparative Examples 1 to 2, it can be obtained that the three-dimensional electrodes 100, 200 for electrolysis, the electrolysis device 300 and the device for electrolysis according to the present invention can significantly improve the electrolytic treatment efficiency of sewage compared with the prior art, and have good application prospects in the field.

[0109] In the present invention, "several" refers to a natural number greater than or equal to "1".

[0110] In the present invention, the specific meanings of "up", "down", "left", "right", "inside", "outside", "middle", "edge", etc. when expressing orientation terms are based on Figure 1The drawing state of the three-dimensional electrode 100 for electrolysis is for reference.

[0111] Finally, it should be noted that although the present invention has been described in detail with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A three-dimensional electrode for electrolysis, comprising: A first connecting member (1); And A first carbon fiber part (2), the first carbon fiber part (2) is arranged around the first connecting member (1), and the first carbon fiber part (2) includes a plurality of first carbon fiber groups (21), and each of the first carbon fiber groups (21) includes a plurality of carbon fiber units (211) with a certain flexibility, Wherein, the three-dimensional electrode for electrolysis is configured to be able to electrolyze sewage.

2. The three-dimensional electrode for electrolysis according to claim 1, characterized in that: The first carbon fiber groups (21) are arranged in sequence along the longitudinal direction of the first connecting member (1), and there is a certain distance between two adjacent first carbon fiber groups (21).

3. The three-dimensional electrode for electrolysis according to claim 2, wherein: All the carbon fiber units (211) within each of the first carbon fiber groups (21) are configured to be fixedly connected to the first connecting member (1).

4. The three-dimensional electrode for electrolysis according to claim 3, characterized in that: The carbon fiber units (211) within two adjacent first carbon fiber groups (21) are configured to be able to collide in response to the action of an external force.

5. The three-dimensional electrode for electrolysis according to claim 4, wherein: All the carbon fiber units (211) within at least part of the first carbon fiber groups (21) are configured to be connected to the same section in the longitudinal direction of the first connecting member (1).

6. The three-dimensional electrode for electrolysis according to claim 5, characterized in that: The carbon fiber units (211) within at least part of the first carbon fiber groups (21) are configured to be evenly distributed in the circumferential direction of the first connecting member (1).

7. The three-dimensional electrode for electrolysis according to claim 2, wherein: It includes an annular mounting part (3) configured to be connected to the first connecting member (1), the annular mounting part (3) includes annular mounting groups (31) whose quantity corresponds to the quantity of the first carbon fiber groups (21), each annular mounting group (31) includes an inner ring (311) made of an insulating material / conductive material, and an outer ring (312) made of a conductive material / insulating material, and the first carbon fiber groups (21) are configured to be connected to both the inner ring (311) and the outer ring (312).

8. The three-dimensional electrode for electrolysis according to claim 7, wherein: The annular mounting groups (31) are configured to maintain a certain distance from each other and be able to shake in response to the action of an external force.

9. The three-dimensional electrode for electrolysis according to claim 8, characterized in that: At least part of the carbon fiber units (211) within the same annular mounting group (31) are configured to be connected to the inner ring (311) at the folding point after folding, and connected to the outer ring (312) with the two wings after folding.

10. The three-dimensional electrode for electrolysis according to any one of claims 1 to 9, characterized in that: The carbon fiber unit (211) is configured to be strip-shaped or linear.

11. The three-dimensional electrode for electrolysis according to claim 10, wherein: The carbon fiber unit (211) is made of a carbon fiber material, and the carbon fiber material includes polyacrylonitrile-based carbon fiber.

12. A three-dimensional electrode, comprising: A second connecting member (4); And A second carbon fiber part (5), the second carbon fiber part (5) is configured to be woven outside the second connecting member (4) and extends along the longitudinal direction of the second connecting member (4), Wherein, the three-dimensional electrode is configured to be able to electrolyze sewage.

13. The three-dimensional electrode according to claim 12, wherein: The second carbon fiber part (5) is configured to be repeatedly bent in its length direction, and a number of second carbon fiber groups (51) connected end to end are formed. The second carbon fiber group (51) includes a first bent section (511) with an opening to the left and a second bent section (512) with an opening to the right, and the lower part of the first bent section (511) coincides with the upper part of the second bent section (512).

14. An electrolysis device, comprising: A first electrolytic cell (6), a first cathode plate (7) and a first anode plate (8) arranged inside the first electrolytic cell (6), and a number of non-contact three-dimensional electrodes for electrolysis as described in any one of claims 1 to 11 arranged between the first cathode plate (7) and the first anode plate (8). The three-dimensional electrodes for electrolysis are connected to the first electrolytic cell (6) through the first connecting member (1), and can electrolyze the sewage inside the first electrolytic cell (6).

15. The electrolysis device according to claim 14, wherein: The outer contour of the first electrolytic cell (6) is configured as a cuboid or a cylinder.

16. A device for electrolysis, comprising: A second electrolytic cell, a second cathode plate and a second anode plate arranged inside the second electrolytic cell, and a number of non-contact three-dimensional electrodes as described in claim 12 or 13 arranged between the second cathode plate and the second anode plate. The three-dimensional electrodes are connected to the second electrolytic cell through the second connecting member (4), and can electrolyze the sewage inside the second electrolytic cell.

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