Coal chemical wastewater treatment system with electrolytic oxidation

Abstract

The present invention belongs to the technical field of coal chemical wastewater treatment, and specifically relates to a coal chemical wastewater treatment system with electrolytic oxidation, including a reaction tank, an aeration unit, an electrode unit, a first baffle and a second baffle. The first baffle is arranged above the electrode plate group, and the second baffle is arranged above the first baffle. A central flow channel is formed in the middle of the plate surface of the first baffle, and multiple layers of annular channels are formed on the periphery of the central flow channel. An axial hole is formed in the middle of the plate surface of the second baffle, and the inner diameter of the axial hole is larger than the inner diameter at the upper port of the central flow channel. The present invention improves the mixing sufficiency and uniformity of the mixed solution of hydrogen peroxide and ferrous ions in the fluid by improving the mixing mass transfer effect between hydrogen peroxide and ferrous ions in the Fenton reaction zone, improves the binding effect between hydrogen peroxide and ferrous ions, induces more other active oxygen, and improves the mixing mass transfer effect with organic matter in the water body, which can enhance the degradation efficiency of organic matter by the Fenton reaction.

Description

Technical Field

[0001] The invention relates to the technical field of coal chemical wastewater treatment, in particular to a coal chemical wastewater treatment system with electrolytic oxidation. Background Art

[0002] Coal chemical wastewater mainly comes from production processes such as coal gasification, coal coking, and coal liquefaction, as well as wastewater generated by production auxiliary facilities. The pollutants in the wastewater mainly include phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur, etc. It is a typical industrial wastewater containing difficult-to-degrade organic compounds. Coal chemical wastewater contains a considerable amount of organic matter that cannot be biochemically treated, and most of them are polycyclic organic matter. Although conventional biochemical methods can achieve good removal effects on phenols and benzene substances in coal chemical wastewater, the treatment effect on difficult-to-degrade organic matter such as quinolines, indoles, pyridines, and carbazoles is relatively poor. In the prior art, a patent document with application number 2012101595509 and invention name "coal chemical wastewater treatment process" discloses a coal chemical wastewater treatment process, which uses an electro-Fenton reaction method to achieve the purpose of further degrading organic matter in wastewater. However, there are still problems of low reaction efficiency and poor degradation efficiency of organic matter. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a coal chemical wastewater treatment system with electrolytic oxidation, which improves the mixing sufficiency and uniformity of the mixed solution of hydrogen peroxide and ferrous ions in the fluid by improving the mixed mass transfer effect between hydrogen peroxide and material components such as ferrous ions in the Fenton reaction zone, and can improve the binding effect between hydrogen peroxide and ferrous ions, induce the generation of more other active oxygen, and improve the mixed mass transfer effect between active oxygen and organic matter in the water body, and finally achieve the technical purpose of further improving the degradation efficiency of organic matter by the Fenton reaction.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a coal chemical wastewater treatment system with electrolytic oxidation, including a reaction tank, a sewage pool connected to the water inlet pipe at the bottom of the reaction tank, a filter, an aeration unit and an electrode unit.

[0005] The filter, the air distribution pipe of the aeration unit, and the electrode plate group of the electrode unit are all arranged in the cavity of the reaction tank, and the filter is correspondingly arranged above the port in the water inlet pipe, the air distribution pipe is arranged above the filter, and the electrode plate group is arranged above the air distribution pipe. A section of the tank cavity of the reaction tank relatively located above the electrode plate group is formed as a Fenton reaction zone. A Fenton reagent dispenser corresponding to the Fenton reaction zone is arranged on the reaction tank.

[0006] A switch is provided below the air distribution pipe, which can select the inner cavity of the reaction tank located below it and the inner cavity of the reaction tank located above it to switch between the on state and the off state. A pH regulator is provided on the reaction tank, and is connected to the inner cavity part of the upper part of the filter.

[0007] A switch is provided above the Fenton reaction zone, and the switch can selectively switch the inner cavity of the reaction tank located relatively below the switch and the inner cavity of the reaction tank located relatively above the switch between an on state and a off state.

[0008] It also includes a first partition and a second partition arranged in the cavity of the reaction tank. The first partition is correspondingly arranged above the electrode plate group and a vertical spacing is formed between the first partition and the electrode plate group in the up-down direction. The second partition is correspondingly arranged above the first partition and a vertical gap is formed between the opposite end surfaces of the two in the up-down direction. On the plate surface of the first partition, a central flow channel is formed in the middle position, and multiple layers of annular fluid channels are formed around the central flow channel. On the plate surface of the second partition, an axial hole is formed in the middle position, and the inner diameter of the axial hole is larger than the inner diameter of the upper port of the central flow channel.

[0009] Optionally, a circulation unit is provided on the reaction tank, and the inlet and outlet ends of the circulation pump in the circulation unit are connected to the cavity of the reaction tank through a pipeline, and the inlet end is connected to the upper middle position of the Fenton reaction zone, and the outlet end is connected to the position between the first partition plate and the electrode plate group. Preferably, a water distributor is arranged at the outlet end of the circulation pump, and the water distributor can evenly disperse and discharge the water body on the cross section of the inner cavity of the reaction tank.

[0010] Optionally, an inner cylinder and an outer cylinder are provided in the Fenton reaction zone. The outer cylinder is sleeved on the periphery of the inner cylinder and corresponds to the middle and upper position of the inner cylinder. Preferably, the axial extension length of the outer cylinder is not greater than the axial extension length of the inner cylinder, and more preferably, the axial extension length of the outer cylinder is 1 / 3 to 2 / 3 of the axial extension length of the inner cylinder. The upper end of the inner cylinder is a closed end, the lower end is an open end, and a conducting groove structure is distributed at least at the upper part of the side wall of the inner cylinder. The lower end of the outer cylinder is a closed end.

[0011] The discharge end of the Fenton reagent dispenser is connected to the cylinder cavity of the inner cylinder through a pipeline. The water inlet end of the circulation pump is connected to the annular cavity formed between the outer circumference of the inner cylinder and the inner circumference of the outer cylinder through a pipeline. Preferably, a plurality of ports are distributed on the free end side of the connecting pipe at the water inlet end of the circulation pump, so that the plurality of ports are alternately distributed around the circumferential direction and are all connected to the annular cavity.

[0012] Optionally, the conducting groove structure formed on the side wall of the inner cylinder is a plurality of long strip-shaped slots alternately arranged around the circumferential direction, and / or a plurality of long arc-shaped slots alternately arranged in the up-down direction.

[0013] Optionally, a boss is formed in the middle of the upper end surface of the first partition, and at least one cover is provided on the upper part of the boss. The upper port of the central flow channel extends to the upper end surface of the boss. Preferably, the upper end surface of the boss is an annular conical surface extending downward from the inside to the outside.

[0014] The cover bodies are matched one by one with the fluid channels located at the periphery of the central flow channel, and the cover bodies are arranged in an alternating arrangement. The lower part of each cover body is connected to the upper end surface of the first baffle of the outer circle of the corresponding matching fluid channel, and the upper part is formed with a through hole located above the central flow channel and passing through in the up-down direction. The hole diameter of the through hole on the cover body located in the inner layer is smaller than the hole diameter of the through hole on the cover body located in the outer layer, and the hole diameter of the through hole on the cover body located in the innermost layer is not smaller than the port diameter at the port on the central flow channel.

[0015] The top wall of the cover body is in a cone shape with the flared end facing downward. The inner diameter of the lower port of the axial hole on the second partition plate is larger than the outer diameter of the cover body at the outermost layer / uppermost layer.

[0016] The gap between the second partition and the top surface of the outermost / uppermost cover body forms an outer layer flow channel; the gaps between the inner and outer end surfaces of the top walls of other adjacent cover bodies and the gap between the inner end surface of the innermost cover body and the top surface of the boss respectively form multiple inner layer flow channels.

[0017] Optionally, a third partition plate and a fourth partition plate are also provided in the cavity of the reaction tank.

[0018] The third partition is supported on the upper end surface of the second partition through a plurality of connecting columns, so that a vertical spacing is formed between the lower end surface of the third partition and the upper end surface of the second partition in the up-down direction. The outer diameter of the third partition is smaller than the outer diameter of the second partition, but larger than the inner diameter of the shaft hole formed on the second partition.

[0019] The fourth partition is arranged above the third partition and a gap layer is formed between the lower end surface of the fourth partition and the upper end surface of the third partition. An axial hole is formed on the plate surface of the fourth partition and the inner diameter of the axial hole is 3 / 10 to 2 / 3 of the outer diameter of the third partition, preferably in the range of 2 / 5 to 1 / 2.

[0020] On the lower end surface of the fourth partition, a plurality of convex points extending downward are distributed around the outer periphery of the axial hole on the fourth partition. The convex points can be cylindrical, conical, or spiral upward.

[0021] Preferably, a spherical boss protruding downward is formed on the lower end surface of the third partition plate. The spherical boss is correspondingly arranged directly above the shaft hole on the second partition plate, and the root outer diameter of the spherical boss is not greater than the upper port inner diameter of the shaft hole on the second partition plate.

[0022] Optionally, the bumps are arranged as follows:

[0023] The extension direction of the convex points is distributed to form a plurality of arcs with a rotation direction in the clockwise direction;

[0024] The convex points at both ends of each arc line are arranged so that the convex points at the outer end are close to the outer edge of the fourth partition plate, and the convex points at the inner end are close to the outer edge of the shaft hole on the fourth partition plate;

[0025] Among the multiple arcs formed by the convex points, between every two adjacent arcs, the outer end convex point corresponds to the outer end convex point on an arc on the downstream side in the hand direction, and the outer end convex point corresponds to the inner end convex point on an arc on the upstream side in the hand direction, and the inner end convex point corresponds to the inner end convex point on the other arc;

[0026] The arc-shaped curved flow channel / vortex flow channel formed by multiple convex points located on two adjacent arc lines promotes the water body or wastewater to flow through the gap layer formed between the fourth partition plate and the third partition plate, forming a radial vortex flow state from the outside to the inside and upward.

[0027] The swirl channel formed at the gap layer between the third partition plate and the fourth partition plate can improve the flow capacity of the water body, increase the flow speed, improve the conductivity and reduce the energy consumption.

[0028] Optionally, on each arc line formed by the convex points, the central angle formed between the two convex points at the two ends is α, and the value of α is between 115 degrees and 135 degrees, preferably in the range of 120 degrees to 130 degrees.

[0029] The central angle formed between the multiple arcs formed by the convex points and between two convex points on the outer ends of two adjacent arcs is β, and the value of β is between 40 degrees and 65 degrees, preferably in the range of 45 degrees to 50 degrees.

[0030] The beneficial effect of the present invention is that the present invention improves the mixing sufficiency and uniformity of the mixed solution of hydrogen peroxide and ferrous ions in the fluid by improving the mixing mass transfer effect between hydrogen peroxide (H2O2) and effective components such as ferrous ions (Fe2+) in the Fenton reaction zone, thereby improving the binding effect between hydrogen peroxide and ferrous ions, so as to more fully induce more other active oxygen substances (such as ions, oxidative bonds, etc.), thereby achieving the purpose of further improving the mixing mass transfer effect between the active oxygen components in the Fenton reaction zone and organic matter in the water body, and helping to further increase the degradation efficiency of the Fenton reaction on organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 for Figure 1Schematic diagram of the cross-sectional structure at AA in the middle.

[0033] Figure 3 It is a schematic diagram of the cross-sectional structure of the first partition.

[0034] Figure 4 It is a schematic diagram of the top view of the structure of the first partition.

[0035] Figure 5 It is a schematic diagram of the cross-sectional structure of the second partition.

[0036] Figure 6 It is a schematic diagram of the top view of the structure of the second partition.

[0037] Figure 7 This is a schematic diagram of the local cross-sectional structure when the third and fourth partitions are arranged above the second partition.

[0038] Figure 8 It is a schematic diagram of the cross-sectional structure of the cooperation between the second and third partitions.

[0039] Fig. 9 It is a schematic diagram of the top view of the structure of the cooperation between the second and third partitions.

[0040] Fig.10 This is a schematic diagram of the structure of the fourth partition as seen from above.

[0041] Fig.11 Schematic diagram of the layout of the protrusions distributed on the fourth partition Figure 1 .

[0042] Fig.12 Schematic diagram of the layout of the protrusions distributed on the fourth partition Figure 2 .

[0043] In the figure: 100 reaction tank, 101 water inlet pipe, 102 water outlet pipe, 200 sewage tank, 300 peristaltic pump; 10 filter; 20 PH regulator; 30 switch; 40 aeration unit, 41 air distribution pipe; 50 electrode unit, 51 electric controller; 60 first partition, 601 outer flow channel, 602 inner flow channel, 61 plate body, 611 outer channel, 612 inner channel, 62 cover body, 621 through hole, 63 boss, 631 central flow channel; 70 second partition, 71 first axial hole, 72 conical counterbore, 73 third partition, 731 spherical boss, 732 connecting column, 74 fourth partition, 741 second axial hole, 742 convex point, 75 gap layer; 80 Fenton reaction zone, 81 inner cylinder, 811 Fenton reagent dispenser, 82 outer cylinder; 90 circulation unit, 91 circulation pump, 92 water distributor. DETAILED DESCRIPTION

[0044] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0045] like Figures 1 to 6 The coal chemical wastewater treatment system with electrolytic oxidation shown includes a reaction tank 100, a sewage pool 200 connected to a water inlet pipe 101 at the lower part of the reaction tank 100 through a pipeline, and a filter 10, an aeration unit 40, an electrode unit 50, a first partition 60 and a second partition 70.

[0046] A peristaltic pump 300 is provided on the connecting pipeline between the reaction tank 100 and the sewage pool 200 . The peristaltic pump 300 can extract wastewater from the sewage pool 200 and transport it to the reaction tank 100 .

[0047] The filter 10, the air distribution pipe 41 of the aeration unit 40, the electrode plate group of the electrode unit 50, the first baffle 60 and the second baffle 70 are all arranged in the cavity of the reaction tank 100. The filter 10 is correspondingly arranged above the port in the water inlet pipe 101, the air distribution pipe 41 is arranged above the filter 10, the electrode plate group is arranged above the air distribution pipe 41, the first baffle 60 is arranged above the electrode plate group, and the second baffle 70 is arranged above the first baffle 60. That is, the filter 10, the air distribution pipe 41, the electrode plate group, the first baffle 60 and the second baffle 70 are arranged in sequence from bottom to top in the cavity of the reaction tank 100, and are arranged in a state of maintaining a vertical / up-down spacing between each other.

[0048] A section of the cavity between the air distribution pipe 41 and the filter 10 is formed as a PH adjustment zone or a first PH adjustment zone. Therefore, a PH regulator 20 associated with the first PH adjustment zone is provided on the reaction tank 100. After the wastewater (after one or more stages of treatment) is sent from the sewage pool 200 to the lower part of the cavity of the reaction tank 100, the filter 10 will perform pre-filtration treatment on larger solids, floccules, etc. in the wastewater, and then allow the wastewater to flow into the first PH adjustment zone. The PH regulator 20 corresponding to the (first PH adjustment zone) sends an appropriate amount of PH regulator into the first PH adjustment zone according to the PH value of the wastewater.

[0049] A switch 30 is provided below the air distribution pipe 41. The switch 30 can selectively switch between the inner cavity section of the reaction tank 100 located below it (which can be understood as the first PH adjustment zone) and the inner cavity section of the reaction tank 100 located above it (which can be understood as the aeration zone, which will be mentioned below) between the on state and the off state. That is, before the PH value of the wastewater in the first PH adjustment zone does not meet the standard, the switch 30 is in the off state; after the PH value of the wastewater in the first PH adjustment zone meets the standard, the switch 30 is switched to the on state to allow the wastewater to enter the aeration zone.

[0050] A certain vertical distance is formed between the gas distribution pipe 41 and the electrode plate group, and this tank cavity section in the reaction tank 100 is defined as an aeration zone. Bubbles ejected from a large number of air holes distributed on the tube wall of the gas distribution pipe 41 are mixed with the wastewater in the aeration zone, and then flow upward to the area corresponding to the electrode plate group, and react with the anode plate and the cathode plate.

[0051] A section of the tank cavity relatively located above the electrode plate group in the reaction tank 100 forms a Fenton reaction zone 80 (or Fenton main reaction zone). A Fenton reagent dispenser 811 corresponding to the Fenton reaction zone 80 is provided on the reaction tank 100.

[0052] Another switch 30 is provided above the Fenton reaction zone 80, and the switch 30 can also select to switch between the inner cavity section of the reaction tank 100 located relatively below it (which can be understood as the Fenton reaction zone 80) and the inner cavity section of the reaction tank 100 located relatively above it between the on state and the off state. That is, before the duration of the Fenton reaction in the Fenton reaction zone 80 reaches the set duration, the corresponding switch 30 is in the off state, and after the set duration is reached, the corresponding switch 30 is opened, so that the wastewater (treated by the Fenton reaction) flows upward to the cavity at one end of the top of the reaction tank 100, and is discharged to the next link through the outlet pipe 102 provided above the cavity.

[0053] An electric controller 51 capable of adjusting the power-on and power-off states of the electrode plate group is disposed outside the reaction tank 100 .

[0054] The first separator 60 and the second separator 70 are arranged in the cavity of the reaction tank 100. The first separator 60 is arranged above the electrode plate group, and a gap is formed between the first separator 60 and the electrode plate group in the vertical direction. The second separator 70 is arranged above the first separator 60, and a gap is formed between the opposite end surfaces of the first separator 60 in the vertical direction (the vertical distance of the gap in the vertical direction needs to be specifically determined according to the number of layers of the cover body 62 provided).

[0055] The reaction tank 100 is provided with a pH regulator 20 corresponding to the Fenton reaction zone 80. The pH regulator 20 is used to add a solution into the Fenton reaction zone 80 to adjust the pH value of the solution in the Fenton reaction zone 80 so that the pH value can be maintained in a better range. The pH regulator 20 is generally arranged at the middle and lower part of the Fenton reaction zone 80.

[0056] The reaction tank 100 is provided with a circulation unit 90, and the inlet and outlet ends of the circulation pump 91 of the circulation unit 90 are connected to the cavity of the reaction tank 100 through a pipeline, and the inlet end is connected to the middle and upper position of the Fenton reaction zone 80, and the outlet end is connected to the position between the first partition 60 and the electrode plate group. Preferably, a water distributor 92 is arranged at the outlet end of the circulation pump 91, and the water distributor 92 can evenly and dispersedly discharge the water body to the (entire) inner cavity cross section of the reaction tank 100, so as to ensure that the reflux water body can be evenly dispersed in the space between the first partition 60 and the electrode plate group, and achieve full and uniform mixing with the peripheral water body.

[0057] After the circulation unit 90 is provided, the mixed mass transfer effect between the liquid components in the Fenton reaction zone 80 and the hydrogen peroxide continuously generated at the electrode plate group can be further enhanced, which helps to enhance the degree of Fenton reaction between the ferrous ions generated during micro-electrolysis and the hydrogen peroxide in the water body, improve the reaction efficiency, and further enhance the effect of achieving efficient degradation of organic matter in the water body / wastewater.

[0058] In order to enhance the convection effect of the water body in the Fenton reaction zone 80, strengthen the mixed mass transfer effect / degree of the ferrous ions in the micro-electrolysis and the water body, and improve the efficiency of the Fenton reaction, an inner cylinder 81 and an outer cylinder 82 are provided in the Fenton reaction zone 80.

[0059] The outer cylinder 82 is sleeved outside the inner cylinder 81 and corresponds to the middle and upper part of the inner cylinder 81. Therefore, the axial direction / vertical height / length of the inner cylinder 81 is greater than the axial direction / vertical height / length of the outer cylinder 82. Generally, the axial length of the inner cylinder 81 can be 1.3 to 3 times the axial length of the outer cylinder 82, but is not limited to this ratio range.

[0060] The upper end of the inner tube 81 is a closed end, the lower end is an open end, and a conducting groove structure is arranged at least on the upper part of the side wall of the inner tube 81. The lower end of the outer tube 82 is a closed end, and the upper end is an open end.

[0061] The lower end of the inner cylinder 81 extends downward and approaches the upper end of the first shaft hole 71 of the second partition plate 70. The inner diameter of the lower end of the inner cylinder 81 is greater than the inner diameter of the upper end of the first shaft hole 71. Figure 1 The lower port of the inner cylinder 81 is formed as a conical expansion port to facilitate water to flow from bottom to top into the cylinder cavity of the inner cylinder 81. A conducting groove structure may also be provided on the side wall of the inner cylinder 81 located at the lower part / outside of the outer cylinder 82, but the density of the conducting groove structure provided in this area should be significantly smaller than the density of the conducting groove structure provided on the side wall of the inner cylinder 81 at the upper part and inside the outer cylinder 82. Figure 1 As shown, the conducting groove structure formed on the side wall of the inner cylinder 81 is a plurality of long strip-shaped slots alternately arranged around the circumference.

[0062] The discharge end of the Fenton reagent dispenser 811 is connected to the cylinder cavity of the inner cylinder 81 through a pipeline. The water inlet end of the circulation pump 91 is connected to the annular cavity formed between the outer circumference of the inner cylinder 81 and the inner circumference of the outer cylinder 82 through a pipeline. A plurality of ports may be distributed on the free end side of the connecting pipe at the water inlet end of the circulation pump 91, and the plurality of ports are alternately distributed around the circumference and are connected to the annular cavity respectively, so as to ensure that the water in the annular cavity can flow outward evenly from multiple radial directions and enter the circulation unit 90.

[0063] In order to make the water / wastewater flow in the radial direction during the upward flow, so as to promote the convection mixing effect inside the water body, the distribution area of ​​hydrogen peroxide in the water body is larger and dispersed more evenly, so as to achieve a better mixing and mass transfer effect with ferrous ions, so as to further improve the reaction efficiency of the Fenton reaction and promote the degradation of organic matter in the wastewater.

[0064] A central flow channel 631 is formed at the middle of the plate surface of the plate body 61 of the first partition plate 60, and two layers of annular fluid channels are formed around the central flow channel 631. Figures 1 to 4 The outer channel 611 and the inner channel 612 are shown. In other embodiments, more than three layers of fluid channels may be provided, and the center of the circle / axis of the multi-layer fluid channels may be coincident or eccentric. A first axial hole 71 is formed in the middle of the plate surface of the second partition plate 70, and the inner diameter of the first axial hole 71 is larger than the inner diameter at the upper end of the central flow channel 631. A conical counterbore 72 may be formed at the lower end of the first axial hole 71, and the expanded end of the conical counterbore 72 is the lower end / outer end (of the conical counterbore 72).

[0065] In the process of water / wastewater flowing from bottom to top, it will partially pass through the outer channel 611, the inner channel 612 and the central flow channel 631. Part of the fluid flowing through the outer channel 611 and / or the inner channel 612 will be blocked by the second partition plate 70 and turn in the radial direction during the upward flow, and at the same time, it will be affected by the fluid flowing through the central flow channel 631. The fluid turning in the radial direction will turn from the outside to the inside in the radial direction and flow upward at the same time, so that the wastewater / fluid will eventually cause turbulence near the first axial hole 71 of the second partition plate 70 during the upward flow of the outer channel 611, the inner channel 612 and the central flow channel 631, so as to promote convection mixing inside the water body, so that molecules such as hydrogen peroxide, as well as ions, unstable chemical bonds, other active oxygen, etc. are evenly dispersed to various places in the water body, so as to improve their full contact effect and reaction effect with organic matter in the wastewater, and help to further improve the reaction efficiency of wastewater treatment.

[0066] On the plate body 61 of the first partition plate 60, a boss 63 is formed in the middle of the upper end surface of the plate body 61, and a cover 62 is provided on the upper part of the boss 63. The upper end of the central flow channel 631 extends to the upper end surface of the boss 63. Figures 1 to 3 As shown, the upper end surface of the boss 63 is preferably an annular conical surface extending downward from the inside to the outside.

[0067] When more than three layers of annular fluid channels (distributed alternately in the radial direction) are arranged on the plate body 61, the number of corresponding covers 62 is more than two. Therefore, it can be understood that the number of covers 62 is one less than the number of fluid channels arranged on the plate body 61. The multiple layers of fluid channels arranged on the plate body 61 may be completely or partially concentric with the central flow channel 631.

[0068] like Figures 1 to 4 As shown, the cover body 62 corresponds to and matches the inner channel 612. The lower portion of the cover body 62 is connected to the upper end surface of the first partition plate 60 on the outer ring side of the inner channel 612, and the upper portion is formed with a through hole 621 located above the central flow channel 631 and penetrating in the up-down direction, and the inner diameter of the through hole 621 is larger than the inner diameter of the upper port of the central flow channel 631.

[0069] In other specific implementation schemes, more than two cover bodies 62 may be provided. At this time, each cover body 62 is matched one by one with each fluid channel located between the central flow channel 631 and the outermost fluid channel (the outer channel 611 shown in the figure), and each cover body 62 is arranged in an upper and lower alternating arrangement. The top surface of the uppermost / outermost cover body 62 is against the lower end surface of the second partition 70. The axial height (height in the up and down direction) and the inner diameter of the cover body 62 both have a trend of changing from large to small from the outside and the inside. The lower part of each cover body 62 is respectively connected to the upper end surface of the first partition 60 on the outer ring side of the corresponding matching (inner) channel, and the upper part is formed with a through hole 621 located above the central flow channel 631 and passing through in the up and down direction. Between the covers 62, the hole diameter of the through hole 621 on the cover 62 located at the inner layer / lower layer is smaller than the hole diameter of the through hole 621 on the cover 62 located at the outer layer / upper layer, and the hole diameter of the through hole 621 on the cover 62 located at the innermost layer / lowest layer is not smaller than the port diameter at the upper port of the central flow channel 631. The top wall of the cover 62 is tapered with the flared end facing downward.

[0070] The inner diameter of the lower end of the first axial hole 71 on the second partition plate 70 is larger than the outer diameter of the outermost cover 62. Figure 1 As shown, the inner diameter of the lower end of the first axial hole 71 (i.e., the inner diameter of the lower end of the tapered counterbore 72 shown in the figure) is larger than the outer diameter of the cover body 62 corresponding to the inner channel 612. The gap between the second partition plate 70 and the top surface of the outermost cover body 62 forms an outer layer flow channel 601, and the gaps between the inner and outer end surfaces of the top walls of other adjacent cover bodies 62 (not shown in the figure) and the gap between the inner end surface of the innermost cover body 62 and the top surface of the boss 63 form a plurality of inner layer flow channels 602.

[0071] In the process of wastewater flowing from bottom to top, it partially passes through the outer channel 611, (one or more) inner channels 612 and the central flow channel 631. The radial dimensions of each inner channel 612 are different. Part of the fluid flowing through the outer channel 611 and / or the inner channel 612 will be blocked by the second partition plate 70 or the cover body 62 in the process of flowing upward, and will be turned in a relatively large range in the radial direction. At the same time, it will be affected by the fluid flowing through the central flow channel 631, causing the fluid turning in the radial direction to turn from the outside to the inside in the radial direction and flow upward at the same time, so that the wastewater / fluid will eventually have a stronger turbulence near the first axial hole 71 of the second partition plate 70 (relative to the case where the cover body 62 is not set) in the process of flowing upward from the outer channel 611, the inner channel 612 and the central flow channel 631. When the number of the cover bodies 62 set is between 2 and 4 layers, the turbulence effect is maintained, and the number of the cover bodies 62 arranged inside and outside should not exceed six layers / six. The turbulence phenomenon can promote convection mixing inside the water body, so that molecules such as hydrogen peroxide, as well as ions, unstable chemical bonds, and other active oxygen mixed in the wastewater are evenly dispersed throughout the water body, improving their full contact and reaction effect with organic matter in the wastewater, and helping to further improve the reaction efficiency of wastewater treatment.

[0072] like Figures 7 to 12 As shown, a third partition plate 73 and a fourth partition plate 74 are further provided in the cavity of the reaction tank 100 .

[0073] The third partition plate 73 is supported on the upper end surface of the second partition plate 70 by a plurality of connecting columns 732, and a vertical gap is formed between the lower end surface of the third partition plate 73 and the upper end surface of the second partition plate 70. The outer diameter of the third partition plate 73 is smaller than the outer diameter of the second partition plate 70, but larger than the inner diameter of the first shaft hole 71 on the second partition plate 70.

[0074] The fourth partition plate 74 is arranged directly above the third partition plate 73, and a gap layer 75 is formed between the lower end surface of the fourth partition plate 74 and the upper end surface of the third partition plate 73. A second axial hole 741 is formed on the plate surface of the fourth partition plate 74, and the inner diameter of the second axial hole 741 is 3 / 10 to 2 / 3 of the outer diameter of the third partition plate 73, preferably in the range of 2 / 5 to 1 / 2.

[0075] On the lower end surface of the fourth partition plate 74, a plurality of downwardly extending protrusions 742 are distributed around the periphery of the second shaft hole 741. The protrusions 742 may be cylindrical, conical or pyramidal, or may be a composite structure with an upward spiral groove formed on the side wall.

[0076] In order to increase the radial flow velocity of the wastewater flowing upward from the first axial hole 71 into the gap layer 75, a spherical boss 731 protruding downward is formed on the lower end surface of the third partition plate 73. The spherical boss 731 is correspondingly arranged directly above the first axial hole 71 on the second partition plate 70, and the root outer diameter of the spherical boss 731 is not greater than the upper port inner diameter of the first axial hole 71 on the second partition plate 70.

[0077] The third partition plate 73 can be connected to the upper end of the connecting column 732 by a spring, and the axis of the spring is arranged in the up-down direction. In this way, the third partition plate 73 can move up and down, which helps to promote the formation of more intense turbulence in the (local) wastewater near its upper and lower end surfaces.

[0078] like Figures 10 to 12 As shown, with the outer peripheral surface side of the fourth partition 74 as the outer side and the axial center side of the second axial hole 741 as the inner side, the arrangement of the protrusions 742 is described as follows: the extension direction of the protrusions 742 is distributed to form a plurality of arcs with a rotation direction along the clockwise direction, as shown in the figure, eight arcs a, b, c, d, e, f, g, and h. Among the protrusions 742 located at the ends of each arc, the protrusions 742 at the outer ends are close to the outer edge of the fourth partition 74, and the protrusions 742 at the inner ends are close to the edge of the second axial hole 741 on the fourth partition 74.

[0079] In the eight arcs formed by the convex points 742, and between every two adjacent arcs, the outer end convex point 742 on an arc on the downstream side of the hand direction (i.e., clockwise direction) corresponds to the outer side of the middle position on another arc, and the outer end convex point 742 on an arc on the upstream side of the hand direction (i.e., clockwise direction) corresponds to the inner side of the middle position on another arc. Fig.11 , Fig.12As shown, between the adjacent arcs a and h, the outer end side convex point 742 on arc a is relatively located at the downstream side of the outer end side convex point 742 on arc h, and conversely, the outer end side convex point 742 on arc h is relatively located at the upstream side of the outer end side convex point 742 on arc a. For the convenience of understanding, the above sentence can be understood as follows: among the eight arcs formed by the convex points 742, the convex point 742 at the outer end of arc a corresponds to the outer side of the middle position relatively close to arc h, the convex point 742 at the inner end of arc h corresponds to the inner side of the middle position relatively close to arc a, and the convex point 742 at the inner end of arc a corresponds to the inner side of the middle position relatively close to arc b; the convex point 742 at the outer end of arc b corresponds to the outer side of the middle position relatively close to arc a, and the convex point 742 at the inner end of arc b corresponds to the inner side of the middle position relatively close to arc c; and so on.

[0080] The middle position referred to above does not refer to an absolute middle position, but represents a range in the middle of the arc, which may be closer to the outer end or the inner end.

[0081] The above setting enables the plurality of convex points 742 located on two adjacent arc lines to form an arc-shaped curved flow channel / swirl flow channel (see FIG. Fig.10 The swirl channel formed at the gap layer 75 between the third baffle 73 and the fourth baffle 74 can improve the flow capacity of the water body, increase the flow speed, make the turbulence inside the water body more intense, improve the mass transfer and mixing effect, and help reduce the energy consumption of the water body flowing upward.

[0082] like Fig.11 As shown, on each arc formed by the convex points 742, the central angle formed between the convex points 742 at both ends is α, and the value of α is between 115 degrees and 135 degrees, preferably in the range of 120 degrees to 130 degrees. In the multiple arcs formed by the convex points 742, the central angle formed between the convex points 742 at the (two) outer ends of each two adjacent arcs is β, and the value of β is between 40 degrees and 65 degrees, preferably in the range of 45 degrees to 50 degrees.

[0083] The number of convex points 742 contained in the multiple arcs formed by the convex points 742 connected in series may be consistent, inconsistent, or not completely consistent. Moreover, the lengths of the multiple arcs formed by the convex points 742 connected in series may be consistent, inconsistent, or not completely consistent.

[0084] like Fig.12As shown, the convex points 742 on the arc formed by the plurality of convex points 742 connected in series can be distributed according to the following rule: the convex points 742 on each arc are arranged from outside to inside along the arc extension direction, the convex points 742 at the outermost end of each arc are on the same circumference, the convex points 742 at the second outermost end of each arc are on the same circumference, the convex points 742 at the third outermost end of each arc are on the same circumference, and so on, until the convex points 742 at the innermost end of each arc are on the same circumference. In addition, the circumferences where the convex points 742 at the above-mentioned various positions are located can be concentric, that is, concentric with the center of the circle O shown in the figure.

[0085] exist Fig.11 , Fig.12 In the figure, the direction toward the radial line (through the center of the circle) is the inner direction, and the direction away from the radial line (through the center of the circle) is the outer direction. Referring to the arrows in the figure, the direction toward the radial line O1-O1 and the direction toward the radial line O2-O2 are both inner directions; conversely, the direction away from the radial line O1-O1 and the direction away from the radial line O2-O2 are both outer directions.

[0086] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A coal chemical wastewater treatment system with electrolytic oxidation, comprising a reaction tank (100), a sewage pool (200) connected to a water inlet pipe (101) at the bottom of the reaction tank (100), a filter (10), an aeration unit (40) and an electrode unit (50); the filter (10), the air distribution pipe (41) of the aeration unit (40) and the electrode plate group of the electrode unit (50) are all arranged in the cavity of the reaction tank (100), the filter (10) is correspondingly arranged above the inner port of the water inlet pipe (101), the air distribution pipe (41) is arranged above the filter (10), and the electrode plate group is arranged above the air distribution pipe (41); A section of the inner cavity of the reaction tank (100) located above the electrode plate group is formed as a Fenton reaction zone (80), and a Fenton reagent dispenser (811) corresponding to the Fenton reaction zone (80) is provided on the reaction tank (100); A switch (30) is provided below the gas distribution pipe (41) to selectively switch the inner cavities of the reaction tank (100) above and below the switch (30) between an on state and a off state; Another switch (30) is provided above the Fenton reaction zone (80) to selectively switch the inner cavities of the reaction tank (100) above and below the switch (30) between an on state and a off state; the feature is that: It also includes a first baffle (60) and a second baffle (70) disposed in the cavity of the reaction tank (100); The first separator (60) is correspondingly arranged above the electrode plate group and has a gap between it and the electrode plate group; The second partition plate (70) is correspondingly arranged above the first partition plate (60), and a gap is formed between the opposite end surfaces of the two. A central flow channel (631) is formed at a central position on the plate surface of the first partition plate (60), and multiple layers of annular fluid channels are formed on the periphery of the central flow channel (631); An axial hole is formed at a central position on the plate surface of the second partition plate (70), and the inner diameter of the axial hole is larger than the inner diameter of the upper end of the central flow channel (631); A boss (63) is formed in the middle of the upper end surface of the first partition plate (60), and at least one cover body (62) is provided on the upper part of the boss (63); the upper end of the central flow channel (631) extends to the upper end surface of the boss (63); The cover bodies (62) are matched one by one with the fluid channels located at the periphery of the central flow channel (631), and the cover bodies (62) are arranged in a matching form of being alternately nested up and down; the lower part of each cover body (62) is connected to the upper end surface of the first baffle (60) on the outer ring side of the corresponding matching fluid channel, and the upper part is formed with a through hole (621) located above the central flow channel (631) and penetrating in the vertical direction; The hole diameter of the through hole (621) on the inner cover body (62) is smaller than the hole diameter of the through hole (621) on the outer cover body (62), and the hole diameter of the through hole (621) on the innermost cover body (62) is not smaller than the port diameter at the upper port of the central flow channel (631); the top wall of the cover body (62) is conical and the flared end faces downward; the inner diameter of the lower port of the axial hole on the second partition plate (70) is larger than the outer diameter of the outermost cover body (62); The gap between the second partition plate (70) and the top surface of the outermost cover body (62) forms an outer flow channel (601); the gaps between the inner and outer end surfaces of the top walls of other adjacent cover bodies (62), and the gap between the inner end surface of the innermost cover body (62) and the top surface of the boss (63) respectively form inner flow channels (602).

2. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 1 is characterized in that: A circulation unit (90) is provided on the reaction tank (100); the inlet and outlet ends of a circulation pump (91) in the circulation unit (90) are connected to the cavity of the reaction tank (100) through a pipeline, and the inlet end is connected to the position of the Fenton reaction zone (80), and the outlet end is connected to the position between the first partition plate (60) and the electrode plate group.

3. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 2 is characterized in that: A water distributor (92) is arranged at the drainage end of the circulation pump (91); the water distributor (92) can cause water to be discharged in a dispersed manner on the inner cavity cross section of the reaction tank (100).

4. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 1 is characterized in that: An inner cylinder (81) and an outer cylinder (82) are provided in the Fenton reaction zone (80); the outer cylinder (82) is sleeved outside the inner cylinder (81) and corresponds to the middle and upper part of the inner cylinder (81); the upper end of the inner cylinder (81) is a closed end, the lower end is an open end, and a conducting groove structure is provided at least on the upper part of the side wall of the inner cylinder (81); the lower end of the outer cylinder (82) is a closed end; The discharge end of the Fenton reagent dispenser (811) is connected to the cylinder cavity of the inner cylinder (81) through a pipeline; the water inlet end of the circulation pump (91) is connected to the annular cavity formed between the outer circumferential surface of the inner cylinder (81) and the inner circumferential surface of the outer cylinder (82) through a pipeline.

5. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 4 is characterized in that: A plurality of ports are distributed on the free end side of the connecting pipe at the water inlet end of the circulation pump (91), and the plurality of ports are distributed alternately around the circumferential direction and are all connected to the annular cavity.

6. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 4 is characterized in that: The conducting groove structure formed on the side wall of the inner cylinder (81) is a plurality of long strip-shaped groove holes alternately arranged in the circumferential direction and / or a plurality of long arc-shaped groove holes alternately arranged in the up-down direction.

7. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 1 is characterized in that: Also includes a third partition (73) and a fourth partition (74); The third partition plate (73) is supported by a plurality of connecting columns (732) and is arranged above the second partition plate (70), and a gap is formed between the third partition plate (73) and the opposite end surfaces of the second partition plate (70); the outer diameter of the third partition plate (73) is smaller than the outer diameter of the second partition plate (70) and larger than the inner diameter of the shaft hole on the second partition plate (70); The fourth partition plate (74) is arranged above the third partition plate (73), and a gap layer (75) is formed between the opposite end surfaces of the fourth partition plate (74) and the third partition plate (73); An axial hole is formed on the plate surface of the fourth partition plate (74), and the inner diameter of the axial hole is 3 / 10 to 2 / 3 of the outer diameter of the third partition plate (73); On the lower end surface of the fourth partition plate (74), a plurality of protrusions (742) extending downward are distributed around the periphery of the axial hole on the fourth partition plate (74).

8. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 7 is characterized in that: The convex points (742) are arranged in such a manner that the extension direction of the convex points (742) is distributed to form a plurality of arcs with a rotation direction in a clockwise direction; The convex points (742) at both ends of each arc line are arranged so that the convex points (742) at the outer end are close to the outer edge of the fourth partition plate (74), and the convex points (742) at the inner end are close to the outer edge of the shaft hole on the fourth partition plate (74); In the plurality of arcs formed by the convex points (742), between every two adjacent arcs, the outer end convex point (742) corresponds to the outer end convex point (742) on an arc on the downstream side in the hand direction, and the outer end convex point (742) corresponds to the inner end convex point (742) on an arc on the upstream side in the hand direction, and the inner end convex point (742) corresponds to the inner end convex point (742) on the other arc on the upstream side; The plurality of convex points (742) located on two adjacent arc lines can form an arc-shaped curved flow channel, so as to cause the wastewater to flow through the gap layer (75) in a radially swirling flow from the outside to the inside and upward.

9. The coal chemical wastewater treatment system with electrolytic oxidation according to claim 8 is characterized in that: On each arc formed by the convex points (742), the central angle formed between the two convex points (742) at the two ends is α, and the value of α is between 115 degrees and 135 degrees; in the multiple arcs formed by the convex points (742), the central angle formed between the two convex points (742) at the outer ends on two adjacent arcs is β, and the value of β is between 40 degrees and 65 degrees.

Images