Energy-saving self-circulation candle reactor and working method thereof

Abstract

The invention relates to an energy-saving self-circulation candle reactor and a working method thereof. The reactor comprises a cylindrical shell, a three-phase mixing unit, a three-phase separation unit, a gas-liquid separation circulation unit and a solid-liquid separation circulation unit, the overall appearance of the shell is in an inverted cylindrical candle style, and the shell is of a two-layer structure with an inner layer and an outer layer and used for installing the three-phase mixing unit, the three-phase separation unit, the gas-liquid separation circulation unit, the solid-liquid separation circulation unit and the intelligent control unit and providing physical supporting and bearing space for organic combination of the three-phase mixing unit, the three-phase separation unit, the gas-liquid separation circulation unit, the solid-liquid separation circulation unit and the intelligent control unit. The device has the characteristics of being simple in structure, accurate in material separation, small in occupied area, convenient to control and the like, and the unique energy-saving self-circulation function of the device can greatly improve the utilization rate of micro-nano electrolysis materials and has the characteristic of reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to an energy-saving self-circulating candle reactor and its working method, belonging to the technical field of new environmental protection equipment. Background Art

[0002] The micro-electrolysis technology is a technical method that uses metal materials with good electrical conductivity and reducibility (such as Fe, Al) to form a primary battery system, and effectively removes heavy metals, refractory organic pollutants and other harmful substances in water through the mechanism of electro-corrosion reaction. Traditional micro-electrolysis technology generally uses large-scale granular micro-electrolysis materials, and usually relies on fixed-bed reactors to carry out micro-electrolysis degradation of pollutants. However, when the granular materials in the reactor become caked and passivated, the cleaning work of the fixed-bed reactor becomes extremely complex and difficult, seriously affecting the long-term stable operation of the reactor. Due to the characteristics of micro-nano materials such as small particle diameter, large specific surface area, and not easy to be blocked or caked, in recent years, micro-electrolysis materials have also developed towards the small scale of micro-nano, and a series of micro-nano level micro-electrolysis materials have been derived, such as micro-nano zero-valent iron materials (Zero-Valent Iron, ZVI), micro-nano zero-valent aluminum materials (Zero-Valent Aluminum, ZVA), micro-nano iron-carbon materials, and homologous materials further developed and derived based on this.

[0003] Although micro-nano-sized micro-electrolysis materials generally have many advantages such as fast reaction rate and high activity for heavy metals, refractory organic pollutants and other harmful substances in water, micro-nano-sized micro-electrolysis materials are not easy to disperse in sewage and are extremely prone to agglomeration, resulting in problems such as low utilization rate of micro-nano electrolysis materials and easy material waste. Although relying on fluidized bed reactors can weaken the occurrence of such phenomena by increasing the fluidization rate or stirring intensity, the energy loss caused by stirring leads to a straight rise in operating costs. In addition, traditional fluidized bed reactors are difficult to accurately separate aged or failed micro-nano materials, resulting in low reactor space utilization rate and poor operation effect. And the control unit of traditional fluidized bed reactors is complex, and multiple parameters such as fluid flow rate, gas volume, and pressure need to be accurately adjusted. Any slight change may affect the stability of the reactor, increasing the difficulty of operation and maintenance. These drawbacks have led to the difficulty of traditional fluidized bed reactors in giving full play to the advantages of micro-nano electrolysis materials, and the demand for new reaction devices is increasing day by day. Summary of the Invention

[0004] In view of the shortcomings of the prior art, especially the problem that the traditional fluidized bed reactor is difficult to give full play to the advantages of micro-nano electrolytic materials, the present invention provides an energy-saving self-circulating candle reactor and its working method. The reactor of the present invention can not only ensure the maximum performance of common micro-nano electrolytic materials, but also greatly reduce the unit energy consumption while ensuring efficient reaction and directional separation of aged and failed micro-nano electrolytic materials.

[0005] The technical solution of the present invention is as follows:

[0006] An energy-saving self-circulating candle reactor comprises a cylindrical shell, a three-phase mixing unit, a three-phase separation unit, a gas-liquid separation circulation unit and a solid-liquid separation circulation unit;

[0007] The shell comprises an outer layer and an inner layer of a concentric structure, and the three-phase mixing unit comprises a double-helix mixer, a solid-liquid mixer and an air blower located at the bottom of the outer layer, and the solid-liquid mixer and the air blower are respectively connected to the double-helix mixer through connecting pipes;

[0008] The three-phase separation unit comprises a multi-layer separation plate located at the upper part of the outer layer, a gas collection pipe, a gas bin and a water collection tank, the multi-layer separation plate is connected to the gas bin through the gas collection pipe, and the water collection tank is located above the multi-layer separation plate;

[0009] The gas-liquid separation circulation unit comprises a gas-liquid separator located at the top of the shell, and the gas-liquid separator is connected to the gas bin through a gas lifting pipe; a trumpet-type carrier is arranged at the lower part of the inner layer, and the trumpet-type carrier is arranged with an opening to communicate with the outer layer; the bottom of the gas-liquid separator is connected to a liquid downflow pipe, and the liquid downflow pipe extends to the lower part of the inner layer and opens at the free end;

[0010] The solid-liquid separation circulation unit includes a central guide tube arranged on the upper part of the inner layer, the top of the central guide tube is connected to the water collection trough, the bottom of the central guide tube is provided with a throat diffuser that diffuses toward the outer layer, the upper part of the central guide tube is provided with a water outlet, and the bottom of the inner layer is connected to a mud hopper with a mud discharge outlet.

[0011] According to the present invention, preferably, the solid-liquid mixer is a cylindrical structure, and is provided with a sewage feed inlet and a micro-nano electrolytic material feed inlet.

[0012] According to the present invention, preferably, the double-helix mixer is a cylindrical structure provided with a double-helix rotating rod, the bottom of the double-helix mixer is connected to the air blower through a connecting pipeline, and the lower part of the double-helix mixer is connected to the solid-liquid mixer through a connecting pipeline.

[0013] According to the present invention, preferably, the multi-layer separation plate is a triangular iron arrangement structure of at least two layers, the bottom surface of each layer of triangular iron is open, and the top corner is connected to the gas bin through a gas collection pipe, and the triangular irons of different layers are arranged in a staggered manner.

[0014] According to the present invention, preferably, a mist eliminator is further provided in the upper part of the gas-liquid separator, and an exhaust port is provided at the top of the gas-liquid separator.

[0015] According to the present invention, preferably, the diameter ratio of the outer layer to the inner layer is 3:1 to 5:1, and the height-diameter ratio of the outer layer is 8:1 to 10:1.

[0016] According to the present invention, preferably, the energy-saving self-circulating candle reactor further includes a control unit connected to the housing; more preferably, the control unit includes a detection instrument group, a control instrument group, and a PLC control module, and the detection instrument group, the control instrument group, and the PLC control module are respectively connected through a control circuit. When the PLC is equipped with an AI edge calculator, intelligent control can be further realized. Specifically, the detection instrument group conducts various index detections and various operating environment detections in the reactor. Among them, various index detections include but are not limited to various wastewater indexes (such as COD, PH, conductivity, characteristic pollutant concentration) and various micro-nano electrolytic material indexes (such as concentration distribution, stock distribution, etc.); various operating environment detections include but are not limited to pressure, temperature, density, etc. The control instrument group includes but is not limited to wastewater flow, chemical addition amount, start and stop of various valves, etc., and is used to execute various instructions issued by the PLC control module. The data collected by the detection instrument group are all summarized in the PLC control module, and the control instrument group executes according to the parameters set in advance by the PLC. When the PLC is equipped with an AI edge calculator, the AI edge calculator performs optimization calculations based on the data collected by the detection instrument group, and then the PLC control module realizes the intelligent operation of the reactor through the control instrument group.

[0017] According to the present invention, the working method of the above-mentioned energy-saving self-circulating candle reactor includes the following steps:

[0018] The micro-nano electrolytic material and the untreated sewage rich in heavy metals, refractory organic pollutants and other harmful substances are preliminarily mixed in a solid-liquid mixer to form a liquid-solid mixture, and then the liquid-solid mixture and the gas from an external air blower are mixed in a double-helix mixer to complete the gas-liquid-solid mixing, and reach a three-phase separation unit for preliminary gas-liquid-solid three-phase separation;

[0019] During the three-phase separation process, the gas separated by multiple separation plates is collected through a gas collection pipe into a gas chamber, and further reaches a gas-liquid separator through a gas lift pipe connected to the gas chamber, and the gas and the wastewater carried by it are further deeply separated in the gas-liquid separator. The gas after two separations is discharged to the outside through the exhaust port provided at the top of the gas-liquid separator; the wastewater and the micro-nano electrolytic material carried by it after being separated by multiple separation plates enter a solid-liquid separation and recycling unit through a water collecting tank to carry out solid-liquid separation;

[0020] The wastewater separated by multiple separation plates and the micro-nano electrolytic materials it carries enter the central draft tube through the water collecting tank. Inside the inner layer, the treated wastewater is separated from the used micro-nano electrolytic materials through the effects of free sedimentation, flocculent sedimentation, and compression sedimentation. The separated micro-nano electrolytic material slurry further precipitates into the mud hopper; the treated wastewater is discharged from the reactor through the water outlet.

[0021] According to the present invention, preferably, the micro-nano electrolytic material slurry of the horn-shaped carrier installed close to the side in the mud hopper is brought into the outer layer for secondary utilization through the Venturi effect under the action of the wastewater separated by the gas-liquid separator in the liquid downcomer. The micro-nano electrolytic materials not carried away by the horn-shaped carrier in the mud hopper are discharged from the reactor through the mud discharge port.

[0022] According to the present invention, preferably, the micro-nano electrolytic materials and the sewage are mixed in a mass ratio of 1:3000 to 1:1000; more preferably, they are mixed in a mass ratio of 1:2000.

[0023] According to the present invention, preferably, the liquid-solid mixture and the gas from an external air blower are mixed in a volume ratio of 1:1 to 1:0.2. After the gas-liquid-solid mixture is completed in the double helix mixer, it reaches the three-phase separation unit at an upflow speed of 3 - 10 m / h for preliminary gas-liquid-solid three-phase separation;

[0024] Preferably, the liquid-solid mixture and the gas from an external air blower are mixed in a volume ratio of 1:0.5. After the gas-liquid-solid mixture, it reaches the three-phase separation unit at an upflow speed of 6 m / h for preliminary gas-liquid-solid three-phase separation.

[0025] According to the present invention, preferably, the particle size diameter of the micro-nano electrolytic materials is 300 nm to 300 μm.

[0026] According to the present invention, preferably, the mass ratio of the micro-nano electrolytic materials brought into the outer layer by the horn-shaped carrier to those discharged from the reactor through the mud discharge port is 1:1 to 1:5, more preferably 1:3.

[0027] According to the present invention, in a preferred embodiment, the overall appearance of the shell of the energy-saving self-circulating candle-type reactor is an inverted cylindrical candle style, having two layers of inner and outer layers. The diameter ratio of the outer layer to the inner layer is 3:1 to 5:1, and the height-diameter ratio of the outer layer 1 is 8:1 to 10:1. When the particle size of the micro-nano electrolytic materials 11 is smaller, the diameter ratio of the inner layer to the outer layer is smaller, and the height-diameter ratio of the outer layer is smaller. The shell is used to install the three-phase mixing unit, three-phase separation unit, gas-liquid separation and circulation unit, solid-liquid separation and circulation unit, and intelligent control unit, providing physical support and a bearing space for the above units and the organic combination between the units.

[0028] The three-phase mixing unit is located at the lower end of the shell and is used to achieve three-phase mixing of gas-liquid-solid. It consists of a double-screw mixer, a solid-liquid mixer, an air blower, and their connecting pipelines. Its main functions are to provide and control the oxygen partial pressure, evenly disperse the micro-nano electrolytic materials, and provide an upflow velocity. The gas is connected from an external air blower, which is used to maintain the ORP potential required for the micro-nano electrolytic materials, provide oxygen, and enhance mixing, and is connected to the double-screw mixer. The liquid is untreated sewage rich in heavy metals, refractory organic pollutants, and other harmful substances; the solid is newly added micro-nano electrolytic materials. The untreated sewage rich in heavy metals, refractory organic pollutants, and other harmful substances and the newly added micro-nano electrolytic materials are mixed in the solid-liquid mixer and then enter the double-screw mixer through the connecting pipeline, and are fully mixed with the gas connected from the external air blower to achieve three-phase batching and mixing.

[0029] The three-phase separation unit is located at the upper end of the shell and mainly consists of multiple separation plates, a gas collection pipe, a gas chamber, and a water collection tank. It is used to achieve the preliminary three-phase separation of gas-liquid-solid after the reaction. The gas is the air that enters after passing through the three-phase mixing unit after the reaction, the liquid is the treated wastewater, and the solid is the micro-nano electrolytic materials. The multiple separation plates play a role in separating gas, liquid, and solid by changing the flow velocity between the plate spacings. The gas that has been preliminarily separated is collected into the gas chamber through the gas collection pipe; the treated wastewater and the micro-nano electrolytic materials it carries enter the solid-liquid separation and circulation unit located in the inner layer through the water collection tank.

[0030] The gas-liquid separation and circulation unit is located at the top of the shell and mainly consists of a gas lift pipe, a gas-liquid separator, a liquid downflow pipe, and a horn-shaped carrier. It plays a role in finely separating the gas separated by the three-phase separation unit and the lifted liquid, enhancing the stirring intensity in the reactor, and carrying the solids separated by the solid-liquid separation and circulation to re-enter the reactor to participate in the reaction. Among them, the gas lift pipe connects the gas chamber of the three-phase separation unit and the gas-liquid separator, and deep separation of the gas and the wastewater it carries for lifting is achieved in the gas-liquid separator. The separated gas is discharged to the outside through the exhaust port provided at the top of the gas separator; the separated wastewater carried enters the liquid downflow pipe. The liquid downflow pipe passes through the solid-liquid separation and circulation unit located at the lower end of the shell and is connected to the horn-shaped carrier installed on the solid-liquid separation and circulation sludge hopper, so as to return the wastewater carried separated by the gas separator to the bottom of the reactor and achieve the purpose of self-circulation function.

[0031] The solid-liquid separation circulation unit is located in the inner layer of the shell and mainly consists of a water outlet, a central draft tube, a throat diffuser, a sludge hopper, and a sludge discharge port. The central draft tube is connected to the collection trough of the three-phase separator and extends to the center of the shell of the candle reactor. Its end is connected to the throat diffuser. The wastewater separated by the three-phase separator and the micro-nano electrolytic materials it carries are subjected to solid-liquid separation through sedimentation. The treated wastewater is discharged out of the reactor through the water outlet; for the separated micro-nano electrolytic materials, part of the wastewater in the liquid downcomer of the gas-liquid separation circulation unit is brought into the reactor through the throat diffuser, thus realizing the self-circulation of the micro-nano electrolytic materials, and the remaining part is discharged out of the reactor by gravity through the sludge discharge port arranged at the bottom of the sludge hopper.

[0032] The control unit mainly consists of a detection instrument group, a control instrument group, a PLC control unit, etc. When the PLC is equipped with an AI edge calculator, intelligent control can be further realized. Specifically, the detection instrument group conducts various index detections and various operating environment detections in the reactor. Among them, various index detections include but are not limited to various wastewater indexes (such as COD, PH, conductivity, characteristic pollutant concentration) and various micro-nano electrolytic material indexes (such as concentration distribution, inventory distribution, etc.); various operating environment detections include but are not limited to pressure, temperature, density, etc. The control instrument group includes but is not limited to wastewater flow, chemical dosage, start and stop of various valves, etc., and is used to execute various instructions issued by the PLC control module. The data collected by the detection instrument group are all summarized into the PLC control module, and the control instrument group executes according to the parameters preset by the PLC. When the PLC is equipped with an AI edge calculator, the AI edge calculator performs optimization calculations based on the data collected by the detection instrument group, and then the PLC control unit realizes the intelligent operation of the reactor through the control instrument group.

[0033] According to the present invention, the energy-saving self-circulation candle reactor has the characteristics of energy-saving self-circulation, and its energy-saving self-circulation characteristics are reflected in two aspects: the energy-saving self-circulation of wastewater and the energy-saving self-circulation of micro-nano electrolytic materials.

[0034] Specifically, the energy-saving self-circulation of wastewater is reflected in that the wastewater carried by the gas in the three-phase separator, after being separated by the gas-liquid separator, returns to the outer layer of the candle reactor through the liquid downcomer and the horn-shaped carrier, thus realizing self-circulation. The mechanism is that there is a density difference between gas and liquid, and the volume of gas increases as the liquid level decreases. Therefore, during the upward flow and floating process of the gas in the gas lift tube, the volume of the bubbles at the upper end of the gas lift tube becomes larger, which causes the liquid to be lifted at the lower end of the gas lift tube. As the gas continuously enters and exits the gas lift tube, the wastewater is continuously lifted to the gas-liquid separator, thus realizing the continuous circulation of wastewater. From the energy perspective, the energy of the fan gas itself is converted into the potential energy of carrying wastewater during the spontaneous upward floating process. Since the self-circulation of wastewater is not driven by any external power, this self-circulation has the characteristic of energy saving.

[0035] Specifically, the energy-saving self-circulation of the micro-nano electrolysis material is reflected in that when the wastewater separated by the gas-liquid separator flows through the horn-shaped carrier installed close to the side in the mud hopper, the micro-nano electrolysis material near the horn-shaped carrier is carried into the outer layer of the candle reactor, thus realizing the self-circulation of the micro-nano electrolysis material. The mechanism lies in that the flow rate of the wastewater in the liquid downcomer is much faster than the sedimentation rate of the micro-nano electrolysis material slurry at the horn mouth. Due to the difference in fluid velocity between the two at the horn mouth, the Venturi effect is triggered. The traction negative pressure caused by the faster-flowing fluid brings the micro-nano electrolysis material slurry into the outer layer of the candle reactor. From an energy perspective, the wastewater separated by the gas-liquid separator has extremely high potential energy. During the descent of the wastewater in the liquid downcomer, the potential energy of the wastewater is converted into kinetic energy. When it reaches the horn-shaped carrier, the kinetic energy of the wastewater is further transferred to the kinetic energy of the relatively slower-flowing micro-nano electrolysis material slurry. Since the self-circulation of the micro-nano electrolysis material has no external power drive, this self-circulation has the characteristic of energy saving.

[0036] Advantages of the present invention:

[0037] The energy-saving self-circulation candle reactor of the present invention can be used for the degradation of toxic and difficult-to-degrade chemical industrial sewage by micro-nano electrolysis materials, and has the characteristics of simple structure, precise material separation, small floor area, and easy control. Its unique energy-saving self-circulation function can greatly improve the utilization rate of micro-nano electrolysis materials and play a role in reducing energy consumption. Description of the Drawings

[0038] Figure 1 is the schematic diagram of the main structure of the energy-saving self-circulation candle reactor of the present invention;

[0039] Figure 2 is the partial structure three-dimensional schematic diagram of the multi-layer separation plate, gas collection pipe, and gas storage part in the three-phase separation unit of the present invention.

[0040] Figure 3 is the partial structure plan schematic diagram of the multi-layer separation plate, gas collection pipe, and gas storage part in the three-phase separation unit of the present invention.

[0041] Wherein: 1. Outer layer; 2. Inner layer; 3. Shell; 4. Control unit; 5. Double helix mixer; 6. Solid-liquid mixer; 7. Connecting pipeline; 8. Air blower; 9. Air; 10. Sewage; 11. Micro-nano electrolysis material; 12. Multi-layer separation plate; 13. Gas collection pipe; 14. Gas storage; 15. Water collection tank; 16. Gas lift pipe; 17. Gas-liquid separator; 18. Liquid downcomer; 19. Horn-shaped carrier; 20. Mist eliminator; 21. Water outlet; 22. Central draft tube; 23. Throat diffuser; 24. Mud hopper; 25. Mud discharge port. Detailed Embodiments

[0042] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings, but is not limited thereto.

[0043] Embodiment 1

[0044] As Figure 1 、 Figure 2 、 Figure 3 shown, an energy-saving self-circulating candle reactor includes a cylindrical shell 3, a three-phase mixing unit, a three-phase separation unit, a gas-liquid separation and circulation unit, and a solid-liquid separation and circulation unit;

[0045] The shell 3 includes an outer layer 1 and an inner layer 2 with a concentric structure. The three-phase mixing unit includes a double-helix mixer 5, a solid-liquid mixer 6, and an air blower 8 located at the bottom of the outer layer 1. The solid-liquid mixer 6 and the air blower 8 are respectively connected to the double-helix mixer 5 through connecting pipelines 7;

[0046] The three-phase separation unit includes a multi-layer separation plate 12, a gas collection pipe 13, a gas chamber 14, and a water collection tank 15 located in the upper part of the outer layer 1. The multi-layer separation plate 12 is connected to the gas chamber 14 through the gas collection pipe 13, and the water collection tank 15 is located above the multi-layer separation plate 12;

[0047] The gas-liquid separation and circulation unit includes a gas-liquid separator 17 located at the top of the shell 3. The gas-liquid separator 17 is connected to the gas chamber 14 through a gas lift pipe 16; a horn-shaped carrier 19 is provided at the lower part of the inner layer 2, and the horn-shaped carrier 19 is provided with an opening communicating with the outer layer 1; the bottom of the gas-liquid separator 17 is connected to a liquid downflow pipe 18, and the liquid downflow pipe 18 extends to the lower part of the inner layer 2 and opens at the free end;

[0048] The solid-liquid separation and circulation unit includes a central draft tube 22 provided in the upper part of the inner layer 2. The top of the central draft tube 22 is connected to the water collection tank 15. A throat diffuser 23 diffusing towards the outer layer 1 is provided at the bottom of the central draft tube 22. A water outlet 21 is provided in the upper part of the central draft tube 22. A sludge hopper 24 provided with a sludge discharge port 25 is connected to the bottom of the inner layer 2.

[0049] In this embodiment, the solid-liquid mixer 6 is of a cylindrical structure and is provided with a sewage 10 feed port and a micro-nano electrolytic material 11 feed port. The double-helix mixer 5 is of a cylindrical structure provided with double spiral rotating rods. The bottom of the double-helix mixer 5 is connected to the air blower 8 through a connecting pipeline 7, and the lower part of the double-helix mixer 5 is connected to the solid-liquid mixer 6 through a connecting pipeline 7.

[0050] The multi-layer separation plate 12 is a two-layer triangular iron arrangement structure, the bottom surface of each layer of triangular iron is open, and the top corner is connected to the gas chamber 14 through the gas collection pipe 13, and the two layers of triangular iron are arranged in a staggered manner. The diameter ratio of the outer layer 1 to the inner layer 2 is 3:1, and the height-diameter ratio of the outer layer is 8:1.

[0051] Example 2

[0052] As described in Example 1, except that:

[0053] A mist collector 20 is also provided at the upper part of the gas-liquid separator 17 , and an exhaust port is provided at the top of the gas-liquid separator 17 .

[0054] Example 3

[0055] As described in Example 1, except that:

[0056] The diameter ratio of the outer layer 1 to the inner layer 2 is 5:1, and the height-to-diameter ratio of the outer layer is 10:1.

[0057] Example 4

[0058] As described in Example 1, except that:

[0059] The energy-saving self-circulating candle reactor also includes a control unit 4 connected to the shell 3, and the control unit 4 includes a detection instrument group, a control instrument group, and a PLC control module. The detection instrument group, the control instrument group, and the PLC control module are respectively connected through a control circuit.

[0060] Example 5

[0061] The working method of any energy-saving self-circulating candle reactor of Examples 1 to 4 comprises the following steps:

[0062] The micro-nano electrolytic material 11 and the untreated sewage 10 rich in heavy metals, refractory organic pollutants and other harmful substances are preliminarily mixed in the solid-liquid mixer 6 to form a liquid-solid mixed liquid. Then, the liquid-solid mixed liquid and the gas connected to the external air blower 8 are mixed in the double-helix mixer 5 to complete the gas-liquid-solid mixing and arrive at the three-phase separation unit for preliminary gas-liquid-solid three-phase separation;

[0063] In the three-phase separation process, the gas separated by the multi-layer separation plate 12 is collected in the gas bin 14 through the gas collection pipe 13, and further reaches the gas-liquid separator 17 through the gas lifting pipe 16 connected to the gas bin, and the gas and the wastewater carried by it are further separated in depth in the gas-liquid separator 17. The gas after the two separations is discharged to the outside through the exhaust port set at the top of the gas-liquid separator 17; the wastewater separated by the multi-layer separation plate 12 and the micro-nano electrolytic material 11 carried by it enter the solid-liquid separation circulation unit through the water collection tank 15 for solid-liquid separation;

[0064] The wastewater separated by the multi-layer separation plate 12 and the micro-nano electrolysis material 11 it carries enter the central draft tube 22 through the water collecting tank 15. In the inner layer 2, the treated wastewater is separated from the used micro-nano electrolysis material 11 through the effects of free sedimentation, stratified sedimentation, and compression sedimentation. The separated micro-nano electrolysis material 11 slurry further precipitates into the mud hopper 24; the treated wastewater is discharged from the reactor through the water outlet 21.

[0065] The micro-nano electrolysis material slurry of the horn-shaped carrier 19 installed close to the side in the mud hopper 24 is brought into the outer layer 1 for secondary utilization through the Venturi effect under the action of the wastewater separated by the gas-liquid separator 17 in the liquid downcomer 18. The micro-nano electrolysis material 11 not carried away by the horn-shaped carrier 19 in the mud hopper 24 is discharged from the reactor through the mud discharge port 25.

[0066] In this embodiment, the micro-nano electrolysis material 11 and the sewage 10 are mixed at a mass ratio of 1:3000; the liquid-solid mixture and the gas connected from the external air blower 8 are mixed at a volume ratio of 1:1. After the gas-liquid-solid mixing is completed in the double helix mixer 5, it reaches the three-phase separation unit at an upflow speed of 3 m / h for preliminary gas-liquid-solid three-phase separation; the particle size diameter of the micro-nano electrolysis material is 300 nm to 300 μm. The mass ratio of the micro-nano electrolysis material brought into the outer layer 1 by the horn-shaped carrier 19 to the micro-nano electrolysis material discharged from the reactor through the mud discharge port 25 is 1:1.

[0067] Example 6

[0068] As described in Example 5, the difference is:

[0069] The micro-nano electrolysis material 11 and the sewage 10 are mixed at a mass ratio of 1:1000, the liquid-solid mixture and the gas connected from the external air blower 8 are mixed at a volume ratio of 1:0.2. After the gas-liquid-solid mixing is completed in the double helix mixer 5, it reaches the three-phase separation unit at an upflow speed of 10 m / h for preliminary gas-liquid-solid three-phase separation; the mass ratio of the micro-nano electrolysis material brought into the outer layer 1 by the horn-shaped carrier 19 to the micro-nano electrolysis material discharged from the reactor through the mud discharge port 25 is 1:5.

Claims

1. An energy-saving self-circulating candle reactor, characterized in that: The reactor comprises a cylindrical shell (3), a three-phase mixing unit, a three-phase separation unit, a gas-liquid separation circulation unit and a solid-liquid separation circulation unit; The shell (3) comprises an outer layer (1) and an inner layer (2) of a concentric structure, and the three-phase mixing unit comprises a double-helix mixer (5), a solid-liquid mixer (6) and an air blower (8) located at the bottom of the outer layer (1), and the solid-liquid mixer (6) and the air blower (8) are respectively connected to the double-helix mixer (5) through a connecting pipeline (7); The three-phase separation unit comprises a multi-layer separation plate (12), a gas collection pipe (13), a gas bin (14) and a water collection tank (15) located on the upper part of the outer layer (1), the multi-layer separation plate (12) is connected to the gas bin (14) through the gas collection pipe (13), and the water collection tank (15) is located above the multi-layer separation plate (12); The gas-liquid separation circulation unit comprises a gas-liquid separator (17) located at the top of the shell (3), and the gas-liquid separator (17) is connected to the gas bin (14) through a gas lifting pipe (16); a trumpet-type carrier (19) is arranged at the lower part of the inner layer (2), and the trumpet-type carrier (19) is arranged with an opening to communicate with the outer layer (1); the bottom of the gas-liquid separator (17) is connected to a liquid downflow pipe (18), and the liquid downflow pipe (18) extends to the lower part of the inner layer (2) and opens at the free end; The solid-liquid separation circulation unit comprises a central flow guide tube (22) arranged on the upper part of the inner layer (2), the top of the central flow guide tube (22) is connected to the water collection trough (15), the bottom of the central flow guide tube (22) is provided with a throat diffuser (23) diffusing toward the outer layer (1), the upper part of the central flow guide tube (22) is provided with a water outlet (21), and the bottom of the inner layer (2) is connected to a mud bucket (24) provided with a mud discharge port (25).

2. The energy-saving self-circulating candle reactor according to claim 1, characterized in that: The solid-liquid mixer (6) is a cylindrical structure and is provided with a sewage (10) feed inlet and a micro-nano electrolytic material (11) feed inlet.

3. The energy-saving self-circulating candle reactor according to claim 1, characterized in that: The double-helix mixer (5) is a cylindrical structure provided with a double-helix rotating rod. The bottom of the double-helix mixer (5) is connected to the air blower (8) via a connecting pipe (7), and the lower part of the double-helix mixer (5) is connected to the solid-liquid mixer (6) via a connecting pipe (7).

4. The energy-saving self-circulating candle reactor according to claim 1, characterized in that: The multi-layer separation plate (12) is a triangular iron arrangement structure of at least two layers, the bottom surface of each layer of triangular iron is open, and the top corner is connected to the gas storage (14) through a gas collection pipe (13), and the triangular irons of different layers are arranged in a staggered manner.

5. The energy-saving self-circulating candle reactor according to claim 1, characterized in that: A mist collector (20) is also provided at the upper part of the gas-liquid separator (17), and an exhaust port is provided at the top of the gas-liquid separator (17).

6. The energy-saving self-circulating candle reactor according to claim 1, characterized in that: The diameter ratio of the outer layer (1) to the inner layer (2) is 3:1 to 5:1, and the height-to-diameter ratio of the outer layer is 8:1 to 10:

1.

7. The energy-saving self-circulating candle reactor according to any one of claims 1 to 6, characterized in that: The energy-saving self-circulating candle-type reactor further comprises a control unit (4) connected to the shell (3), the control unit (4) comprising a detection instrument group, a control instrument group, and a PLC control module, and the detection instrument group, the control instrument group, and the PLC control module are respectively connected via a control circuit.

8. The working method of the energy-saving self-circulating candle reactor according to any one of claims 1 to 6 comprises the following steps: The micro-nano electrolytic material (11) and the untreated sewage (10) rich in heavy metals, refractory organic pollutants and other harmful substances are preliminarily mixed in a solid-liquid mixer (6) to form a liquid-solid mixed liquid. The liquid-solid mixed liquid is then mixed with the gas from the external air blower (8) in a double-helix mixer (5) to complete gas-liquid-solid mixing and arrive at a three-phase separation unit for preliminary gas-liquid-solid three-phase separation. In the three-phase separation process, the gas separated by the multi-layer separation plate (12) is collected in the gas bin (14) through the gas collection pipe (13), and further reaches the gas-liquid separator (17) through the gas lifting pipe (16) connected to the gas bin, and the gas and the wastewater carried by it are further separated in depth in the gas-liquid separator (17). The gas after the two separations is discharged to the outside through the exhaust port arranged at the top of the gas-liquid separator (17); the wastewater separated by the multi-layer separation plate (12) and the micro-nano electrolytic material (11) carried by it enter the solid-liquid separation circulation unit through the water collection tank (15) to carry out solid-liquid separation; The wastewater separated by the multi-layer separation plate (12) and the micro-nano electrolytic material (11) carried by it enter the central guide tube (22) through the water collection trough (15), and the treated wastewater and the used micro-nano electrolytic material (11) are separated in the inner layer (2) through the effects of free sedimentation, layered sedimentation and compressed sedimentation, and the separated micro-nano electrolytic material (11) slurry is further precipitated into the mud bucket (24); the treated wastewater is discharged from the reactor through the water outlet (21); The micro-nano electrolytic material slurry in the trumpet-type carrier (19) installed close to the side of the mud bucket (24) is brought into the outer layer (1) for secondary utilization through the Venturi effect under the action of the wastewater separated from the gas-liquid separator (17) in the liquid downflow pipe (18), and the micro-nano electrolytic material (11) in the mud bucket (24) that is not taken away by the trumpet-type carrier (19) is discharged from the reactor through the mud discharge port (25).

9. The working method of the energy-saving self-circulating candle reactor according to claim 8, characterized in that: The micro-nano electrolytic material (11) and the sewage (10) are mixed in a mass ratio of 1:3000 to 1:1000; Preferably, the liquid-solid mixture is mixed with the gas connected to the external air blower (8) at a volume ratio of 1:1 to 1:0.2, and after the gas-liquid-solid mixing is completed in the double-screw mixer (5), it reaches the three-phase separation unit at an upward flow rate of 3-10m / h for preliminary gas-liquid-solid three-phase separation.

10. The working method of the energy-saving self-circulating candle reactor according to claim 8, characterized in that: The particle diameter of the micro-nano electrolytic material (11) is 300nm-300μm.

Images