An electrolytic oxidation treatment device and method with descaling function

Abstract

This application discloses an electrolytic oxidation treatment device and method with descaling function, including a power supply and a reactor. The reactor is equipped with an anode and a cathode. The output terminal of the power supply is connected to a circuit switching module, and the anode and cathode are electrically connected to the circuit switching module respectively. An aeration module is also provided in the reactor. The descaling device also includes a controller, which is electrically connected to the power supply, the circuit switching module and the aeration module respectively. In use, the circuit is first turned on to perform forward electrolysis, and then the circuit connection is reversed by the circuit switching module to achieve reverse electrolysis. Then, the aeration module is started to perform aeration and descaling treatment on the anode and cathode. Compared with the prior art, this application changes the acid and alkaline environment near the two electrodes by operating the forward and reverse electrolysis cycles, which destroys the scaling conditions and makes the original scale layer easier to fall off. At the same time, the aeration module will use compressed air to flush the dirt on the cathode surface, further accelerating the removal of dirt and improving the separation and dissolution effect of dirt.

Description

Technical Field

[0001] This application relates to the field of environmental protection equipment technology, specifically to an electrolytic oxidation treatment device and descaling method with descaling function. Background Technology

[0002] Electrochemical oxidation is a novel technology that removes pollutants through direct or indirect electrochemical reactions on electrodes under the influence of an applied electric field. This technology is increasingly widely used in wastewater treatment due to its high oxidation efficiency, lack of chemical reagents, absence of sludge production, small footprint, and ease of operation. However, for wastewater with high hardness, during the electrochemical reaction, organic matter undergoes oxidation on the anode surface, producing bicarbonate ions (HCO3-). - ), carbonate ions (CO3) 2- Dissolved CO2 and other substances migrate into the entire wastewater, while water molecules undergo a reduction reaction on the cathode surface to produce hydroxide ions (OH-). - This leads to a large amount of Ca in the water. 2+ Mg 2+ CO3 near the cathode 2- OH - The rapid combination of these substances forms precipitates such as calcium carbonate, magnesium carbonate, and magnesium hydroxide, which are deposited at the cathode. After a period of operation, the scaling at the cathode becomes quite severe, thus affecting the normal operation of the system.

[0003] Existing technologies cannot completely clean the fouling on the cathode surface of the electrodes, and physical methods or manual cleaning are ultimately required, which not only increases the additional processing costs but also affects the normal operation of the electrolytic oxidation system. Summary of the Invention

[0004] The main purpose of this application is to provide an electrolytic oxidation treatment device and method with descaling function, which aims to solve the defects of the prior art that cannot effectively remove cathode fouling.

[0005] This application achieves the above objectives through the following technical solutions:

[0006] An electrolytic oxidation treatment device with descaling function, including a power supply;

[0007] A reactor, wherein an anode and a cathode are provided;

[0008] A circuit switching module, wherein the input terminal of the circuit switching module is electrically connected to the power supply, and the anode and cathode are respectively electrically connected to the output terminal of the circuit switching module, and the circuit switching module is used to reverse the connection state of the anode and cathode with the power supply;

[0009] An aeration module is disposed inside the reactor;

[0010] The controller is electrically connected to the power supply, the circuit switching module, and the aeration module, respectively.

[0011] Optionally, the circuit switching module includes a housing, in which an adjusting valve core is slidably disposed. The adjusting valve core is provided with a first wiring area and a second wiring area with opposite wiring states. The housing is also provided with a plurality of elastic joints, one end of each elastic joint being connected to the positive terminal, negative terminal, anode, and cathode of the power supply, respectively, and the other end being electrically connected to the first wiring area or the second wiring area. The housing is also provided with a push-pull electromagnet connected to the adjusting valve core.

[0012] Optionally, both the first and second wiring areas are provided with a positive conductive plate, a negative conductive plate, an anode conductive plate, and a cathode conductive plate, each corresponding to a specific elastic connector. In the first wiring area, the anode conductive plate is connected to the positive conductive plate, and the cathode conductive plate is connected to the negative conductive plate. In the second wiring area, the anode conductive plate is connected to the negative conductive plate, and the cathode conductive plate is connected to the positive conductive plate.

[0013] Optionally, both the first wiring area and the second wiring area are provided with a plurality of T-shaped insertion slots. The positive electrode conductive sheet, negative electrode conductive sheet, anode conductive sheet and cathode conductive sheet each include an integrally connected base plate and abutment plate. The base plate is inserted and connected to the insertion slot. Along the moving direction of the regulating valve core, both ends of the abutment plate are provided with guide surfaces at an inclination.

[0014] Optionally, both the first wiring area and the second wiring area on the regulating valve core are provided with at least two wire holes, and each wire hole is provided with a connecting wire.

[0015] Optionally, the resilient joint includes a housing and a conductive rod slidably disposed within the housing, the housing being connected to the casing; a return spring is also disposed within the housing, and a compression ring is disposed on the conductive rod, the return spring abutting against the housing and the compression ring respectively.

[0016] Optionally, the aeration module includes an aeration pipe and an air compressor. The aeration pipe is located at the bottom of the reactor, and the inlet end of the aeration pipe is connected to the air compressor. The aeration pipe is also evenly provided with a number of exhaust holes.

[0017] Optionally, the descaling device also includes a circulating pump, the inlet of which is connected to the reactor via a suction pipe, and the outlet of which is connected to the reactor via a delivery pipe.

[0018] Accordingly, this application also discloses a descaling method based on the above-mentioned descaling device, including the following steps:

[0019] Wastewater is treated by forward electrolysis by switching the circuit to activate the circuit.

[0020] Reverse electrolysis is performed by switching the module's wiring state through a circuit.

[0021] Start the aeration module and circulation pump to perform aeration and descaling treatment on the anode and cathode;

[0022] The voltage rise value ΔU of the reactor is detected. If ΔU is greater than 0.5V, the scale removal is unqualified; otherwise, the scale removal is qualified. If the scale removal is qualified, the descaling is stopped and forward electrolysis continues.

[0023] If the scale removal is not up to standard, start the aeration module and circulation pump for secondary aeration until it meets the standard; otherwise, stop the scale removal process.

[0024] Optionally, secondary aeration includes the following steps:

[0025] Test the pH of the wastewater. If the pH is ≥ 2, add acid to the reactor until the pH of the wastewater in the reactor is < 2; if the pH is < 2, no acid needs to be added.

[0026] The aeration module is activated to provide secondary aeration to the anode and cathode, with an aeration intensity of 5-15 L / m³. 2 ·s;

[0027] Start the circulation pump and simultaneously control the residence time of the wastewater in the reactor to be 1-10 minutes.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] This application includes a power source and a reactor. The reactor contains an anode and a cathode. The output terminal of the power source is connected to a circuit switching module. The anode and cathode are electrically connected to the output terminal of the circuit switching module, and the circuit switching module is used to reverse the connection state of the anode and cathode with the power source. The reactor also contains an aeration module. The descaling device further includes a controller, which is electrically connected to the power source, the circuit switching module, and the aeration module.

[0030] Accordingly, this application also discloses a descaling method based on the above-mentioned descaling device. First, the circuit is turned on for forward electrolysis. After forward electrolysis for a period of time (5-10h), the connection state of the anode and cathode to the power supply is reversed by the circuit switching module to achieve reverse electrolysis (3-30s). Then, the aeration module is started to perform aeration and flushing descaling treatment on the anode and cathode. Finally, the voltage rise value of the reactor is detected to determine whether the scale is cleaned up. If it is not up to standard, aeration continues until the descaling is up to standard.

[0031] During forward electrolysis, organic matter undergoes an oxidation reaction on the anode surface to produce bicarbonate ions (HCO3-). - ), carbonate ions (CO3) 2- Dissolved CO2, etc., and water undergo a reduction reaction on the cathode surface to produce OH. - (See reaction formula 1-1), due to the interfacial reaction producing OH... - This causes the pH to rise near the cathode interface region (not the bulk wastewater), and CO3 levels to increase. 2- Increase (see reaction (1-2):)

[0032] 2H₂O + 2e → 2OH⁻ - + H2↑ (1-1)

[0033] HCO3 - + OH - → H2O + CO3 2- (1-2)

[0034] Due to electrostatic attraction, scale-forming ions Ca in water... 2+ Mg 2+ These substances migrate towards the vicinity of the cathode and eventually accumulate near the cathode surface, forming scale-like substances such as CaCO3, MgCO3, and Mg(OH)2, which precipitate out and contribute to the alkaline content (OH-) in the wastewater. - CO3 2- The continuous consumption of these substances results in the actual acidity of the wastewater, with the pH value potentially dropping below 3.

[0035] Because this application reverses the electrode connection method, that is, the cathode is connected to the positive terminal of the power supply and the anode is connected to the negative terminal of the power supply, after the electrode connection method is switched, the original anode will operate as the cathode, and the original cathode will operate as the anode, thereby changing the original acid and alkaline environment near the two electrodes, destroying the scaling conditions, causing the original scale layer to peel off and be dissolved by the acidic wastewater in the body until it disappears.

[0036] Subsequently, the reactor is aerated using an aeration device, which uses compressed air to flush the dirt on the cathode surface. On the one hand, the rising air bubbles continuously flush the dirt on the cathode surface, weakening the dirt's adhesion and further accelerating the removal of dirt, effectively improving the dissolution and separation effect. On the other hand, the wastewater in the reactor is also set with a high circulation velocity (5-20 m / h) during the aeration process, thereby flushing the dirt with wastewater and further improving the removal effect.

[0037] Compared with existing technologies, firstly, after the electrodes are reversed, the scale generated on the original cathode surface can be quickly peeled off and completely dissolved and disappears, resulting in thorough and efficient descaling.

[0038] Secondly, this application can achieve descaling by reversing the electrode connection method, and at the same time, it can still treat high-calcium organic wastewater during the descaling process. That is, the entire descaling process and wastewater treatment process can be carried out simultaneously, and there is no need to stop the machine to remove dirt. Therefore, it can effectively improve production efficiency.

[0039] Finally, the entire device has a simple structure, and the above functions can be achieved by switching the circuit module, the aeration module, and the circulation pump, resulting in low equipment investment costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of an electrolytic oxidation treatment device with descaling function provided in Embodiment 1 of this application;

[0041] Figure 2 An exploded view of an electrolytic oxidation treatment apparatus with descaling function provided in Embodiment 1 of this application;

[0042] Figure 3 This is an exploded view of the circuit switching module;

[0043] Figure 4 Exploded view of the regulating valve core;

[0044] Figure 5 This is a cross-sectional view of the circuit switching module along the axial direction of the regulating valve core.

[0045] Figure 6 This is a cross-sectional view of the circuit switching module along the radial direction of the regulating valve core.

[0046] Figure 7 This is the circuit switching schematic diagram;

[0047] Figure 8 A flowchart of the descaling method provided in Embodiment 2 of this application;

[0048] Reference numerals: 1-Power supply, 2-Reactor, 3-Anode, 4-Cathode, 5-Controller, 6-Housing, 7-Regulating valve core, 8-First wiring area, 9-Second wiring area, 10-Flexible joint, 11-Electromagnet, 12-Positive conductive plate, 13-Negative conductive plate, 14-Anode conductive plate, 15-Cathode conductive plate, 16-Intercepting slot, 17-Base plate, 18-Abutting plate, 19-Guide surface, 20-Wire hole, 21-Connecting wire, 22-Aeration pipe, 23-Air compressor, 24-Exhaust port, 25-Circulating pump, 26-Water suction pipe, 27-Water delivery pipe, 28-Mounting hole, 101-Housing shell, 102-Conductive rod, 103-Reset spring, 104-Squeezing ring.

[0049] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0054] Implementation Method 1

[0055] Reference Figures 1 to 7 This embodiment, as an optional embodiment of this application, discloses an electrolytic oxidation treatment device with descaling function, including a power source 1 and a reactor 2, wherein the reactor 2 is used to hold wastewater to be treated.

[0056] An anode 3 and a cathode 4 are also provided in the reactor 2. It should be noted that the anode 3 and the cathode 4 are preferably made of the same material, and the anode 3 and the cathode 4 are preferably metals such as aluminum and titanium, or one or two of titanium oxide, tin oxide and lead oxide.

[0057] The descaling device also includes an aeration module, which includes an aeration pipe 22 and an air compressor 23. The aeration pipe 22 is located at the bottom of the reactor 2. Along the axis of the aeration pipe 22, one end of the aeration pipe 22 is connected to the exhaust pipe of the air compressor 23. It should be noted that a blower can also be used instead of the air compressor 23, depending on the actual needs. However, the air compressor 23 can output high-pressure gas with a higher flow rate, which is beneficial to improving the cleaning effect of the dirt.

[0058] Along the axis of the aeration pipe 22, a plurality of exhaust holes 24 are sequentially arranged on the outer peripheral surface of the aeration pipe 22, and the exhaust holes 24 can be evenly arranged.

[0059] Preferably, the exhaust port 24 can be divided into two groups, with the two groups of exhaust ports 24 respectively located directly below the anode 3 and the cathode 4, thereby achieving centralized flushing of the cathode 4 and the anode 3;

[0060] Furthermore, each of the exhaust holes 24 can be distributed in a ring or plum blossom shape and arranged around the anode 3 or cathode 4. The arrangement of the exhaust holes 24 can form a denser ring of bubbles, thereby enveloping the entire anode 3 or cathode 4, avoiding dead corners in bubble rinsing, and improving the rinsing quality of dirt.

[0061] The descaling device also includes a circulating pump 25, the inlet of which is connected to the reactor 2 via a suction pipe 26, and the outlet of which is connected to the reactor 2 via a water delivery pipe 27; a filter may also be added to the suction pipe 26.

[0062] The wastewater to be treated is continuously circulated by the circulating pump 25. On the one hand, a flowing water flow is formed, which washes the anode 3 and cathode 4 through the water flow velocity, further realizing the stripping effect of the dirt and improving the removal effect and efficiency of the dirt. On the other hand, the continuously circulating water flow can also carry the stripped dirt out of the reactor 2 and discharge it after filtration through the filter, avoiding the continuous accumulation of dirt in the reactor 2. While reducing the burden on the reactor 2, it can also avoid the impact of dirt accumulation on the flushing airflow.

[0063] The electrolytic oxidation treatment device further includes a circuit switching module, which includes a housing 6. The housing 6 is cylindrical in shape and has a cavity inside. An adjusting valve core 7 is slidably disposed in the cavity. The adjusting valve core 7 is cylindrical in shape. The adjusting valve core 7 is made of bakelite. Along the axial direction of the adjusting valve core 7, a first wiring area 8 is provided at one end of the adjusting valve core 7, and a second wiring area 9 is provided at the other end.

[0064] Both the first wiring area 8 and the second wiring area 9 include a positive electrode conductive sheet 12, a negative electrode conductive sheet 13, an anode conductive sheet 3, and a cathode conductive sheet 4. At the same time, four insertion slots 16 are provided in both the first wiring area 8 and the second wiring area 9. The cross-section of each insertion slot 16 is a T-shaped structure. The positive electrode conductive sheet 12, the negative electrode conductive sheet 13, the anode conductive sheet 3, and the cathode conductive sheet 4 have the same structure. They all include an integrally connected base plate 17 and abutment plate 18. The base plate 17 is generally flat, and the abutment plate 18 is generally arc-shaped or V-shaped, so that inclined guide surfaces 19 are formed on both sides.

[0065] The bottom surface of the abutment plate 18 is attached to the top surface of the base plate 17 to achieve an integral connection. At the same time, the width of the base plate 17 is greater than the width of the abutment plate 18 to facilitate its cooperation with the insertion slot 16.

[0066] During installation, the base plate 17 is inserted into the insertion slot 16, the abutment plate 18 protrudes out of the regulating valve core 7 along the radial direction of the regulating valve core 7, and the base plate 17 is tightly fitted to each side of the insertion slot 16.

[0067] Meanwhile, two wire holes 20 are provided in both the first wiring area 8 and the second wiring area 9. A connecting wire 21 is provided in both wire holes 20. In the first wiring area 8, one connecting wire 21 connects the anode 3 conductive sheet to the positive electrode conductive sheet 12, and the other connecting wire 21 connects the cathode 4 conductive sheet to the negative electrode conductive sheet 13.

[0068] Within the second wiring area 9, one of the connecting wires 21 connects the anode 3 conductive sheet to the negative electrode conductive sheet 13, while the other connecting wire 21 connects the cathode 4 conductive sheet to the positive electrode conductive sheet 12.

[0069] Furthermore, a push-pull electromagnet 11 is also provided on the housing 6. The telescopic rod of the push-pull electromagnet 11 is connected to the regulating valve core 7, thereby controlling the movement of the regulating valve core 7 within the housing 6 through the push-pull electromagnet 11, thereby realizing the adjustment of the wiring state.

[0070] Furthermore, four mounting holes 28 are provided on the housing 6. Each mounting hole 28 consists of two sets, i.e., two mounting holes 28 in each set. Along the axis of the housing 6, the two sets of mounting holes 28 are located on both sides of the housing 6. The axis of each mounting hole 28 is perpendicular to the axis of the housing 6, i.e., each mounting hole 28 is arranged along the radial direction of the housing 6.

[0071] The two mounting holes 28 in the same group are arranged along the axis of the housing 6; each mounting hole 28 communicates with the cavity on the housing 6, and an elastic joint 10 is provided in each mounting hole 28;

[0072] The elastic joint 10 includes a housing 101, and a connecting thread is provided on the outer peripheral surface of the housing 101, so as to be connected to the mounting hole 28 by the connecting thread; the housing 101 is generally cylindrical, with one end fully open and the other end provided with a stepped hole. During installation, the end provided with the socket hole is inserted into the mounting hole 28, and a conductive rod 102 is slidably disposed in the housing 101. One end of the conductive rod 102 passes through the stepped hole and is inserted into the cavity of the housing 6.

[0073] The opening end of the housing 101 is also threadedly connected to a sealing cap. The sealing cap is provided with a plug hole coaxial with the stepped hole. The other end of the conductive rod 102 extends out of the housing 101 through the plug hole and is used to connect to external electrical devices.

[0074] A return spring 103 is also provided inside the outer casing 101, and a compression ring 104 is integrally connected to the conductive rod 102. The two ends of the return spring 103 are respectively tightly fitted to the sealing cover and the compression ring 104.

[0075] The reset spring 103 ensures that the conductive rod 102 has a certain elasticity and rebound space. On the one hand, it ensures that the conductive rod 102 is in close contact with each conductive sheet, thereby ensuring the reliability and stability of the circuit conduction. On the other hand, the appropriate amount of rebound can prevent hard contact between the conductive rod 102 and the regulating valve core 7, thereby protecting each component and extending the service life of the equipment.

[0076] It should be noted that each of the four elastic joints 10 provided on the housing 6 has a fixed connection object, as shown in the reference. Figure 7 Two of the elastic connectors 10 located on the same side of the housing 6 are numbered A and B respectively, and the two elastic connectors 10 on the other side are numbered C and D. The elastic connector 10 numbered A is connected to the positive terminal of the power supply 1, the elastic connector 10 numbered B is connected to the negative terminal of the power supply 1, the elastic connector 10 numbered C is connected to the anode 3, and the elastic connector 10 numbered D is connected to the cathode 4.

[0077] It should be noted that the above connection method is only a reference and the connection can be changed, but the change of the wiring method must ensure that the function of reversing the electrodes can be achieved.

[0078] The descaling device also includes a controller 5, which includes an industrial control computer and a PLC. The industrial control computer is communicatively connected to the PLC, and the PLC is electrically connected to the power supply 1, the air compressor 23, the circulating pump 25, and the push-pull electromagnet 11.

[0079] In use, in addition to connecting the power supply 1, anode 3, and cathode 4 as described above, during forward electrolysis, the circuit switching module is in its initial state. At this time, each terminal is connected through the first wiring area 8, as shown below. Figure 7 As shown, the positive conductive plate 12 is electrically connected to the elastic connector 10 connected to the positive terminal of the power supply 1, and the negative conductive plate 13 is electrically connected to the elastic connector 10 connected to the negative terminal of the power supply 1. At this time, the elastic connector 10 connected to the anode 3 is electrically connected to the conductive plate of the anode 3, and the elastic connector 10 connected to the cathode 4 is electrically connected to the conductive plate of the cathode 4. Since the positive conductive plate 12 is connected to the conductive plate of the anode 3 in the first wiring area 8, the positive terminal of the power supply 1 is connected to the anode 3, and similarly, the negative terminal of the power supply 1 is connected to the cathode 4.

[0080] When the wiring status needs to be adjusted, the regulating valve core 7 is slid by controlling the sliding of the push-pull electromagnet 11. Each conductive piece in the first wiring area 8 gradually disengages from each of the elastic connectors 10. Each conductive piece in the second wiring area 9 contacts the conductive rod 102 of each of the elastic connectors 10 to achieve conduction. Since the anode 3 conductive piece is connected to the negative conductive piece 13 and the cathode 4 conductive piece is connected to the positive conductive piece 12 in the second wiring area 9, when connecting each line through the second wiring area 9, the positive terminal of the power supply 1 is connected to the cathode 4, while the negative terminal of the power supply 1 is connected to the anode 3, thereby achieving the reverse connection of the circuit and reversing the connection status of the anode 3 and cathode 4 with the power supply 1.

[0081] When it is necessary to switch the connection state again, close the push-pull electromagnet 11. Under the action of its own spring, the push-pull electromagnet 11 will reset, thereby driving the regulating valve core 7 to reset.

[0082] Compared with existing technologies, the circuit switching module structure described above is simple and easy to operate, which reduces the hardware cost of the equipment and simplifies the control program.

[0083] Secondly, this application achieves circuit switching by adjusting the movement of the valve core 7, and its simple structural design can effectively improve the stability and reliability of the equipment operation.

[0084] Furthermore, both the housing 6 and the outer shell 101 can be made of insulators such as bakelite, and an insulating shell can also be fitted onto the outer surface of the conductive rod 102, the insulating shell being made of insulators such as bakelite.

[0085] The above insulation treatment can prevent the entire circuit switching module from becoming a conductor, thereby reducing the heat generation and energy consumption of the equipment and ensuring its stable operation.

[0086] Accordingly, this application also discloses a wastewater treatment device, which includes several sets of electrolytic oxidation treatment devices as described above. In use, each set of devices operates independently. The operation process includes water inlet, forward electrolysis, reverse electrolysis, aeration, and drainage. The advantage of the periodic operation of the above-mentioned sets of devices is that, on the one hand, the parallel and independent operation of multiple sets of devices can ensure continuous water inlet and outlet; on the other hand, it can ensure that the cathode surface of high-calcium wastewater is always in a state of low or no scale during the treatment process, so that the system does not need to be shut down for cleaning of scale, and does not affect the operation of the system, thereby ensuring the electrolytic oxidation operation efficiency of the entire wastewater treatment device.

[0087] Implementation Method 2

[0088] Reference Figure 8 This embodiment, as another optional embodiment of this application, discloses a descaling method based on the aforementioned electrolytic oxidation treatment device, comprising the following steps:

[0089] S1. The circuit is switched on by switching the module to perform forward electrolysis;

[0090] First, connect the circuits to assemble the entire system;

[0091] Then the circuit is connected through the first connection area. At this time, the positive terminal of the power supply is connected to the anode and the negative terminal of the power supply is connected to the cathode, thereby realizing forward electrolysis.

[0092] It should be noted that the forward electrolysis time is t1 = 5-10 h, and the current density is 100-600 A / m. 2 Simultaneously, the circulation pump can be started before forward electrolysis to maintain the circulation of wastewater in the reactor.

[0093] S2. Reverse electrolysis is performed by switching the module's wiring state through the circuit.

[0094] When it is determined that the dirt attached to the cathode needs to be removed, the electromagnet is activated by the controller. The push-pull electromagnet controls the sliding of the regulating valve core. The conductive pieces in the first wiring area will gradually separate from the elastic joints, while the conductive pieces in the second wiring area will gradually connect to the elastic joints.

[0095] This reverses the circuit connection, enabling reverse electrolysis. The reverse electrolysis time is t2 = 3-30 s, and the current density is 1-6 A / m. 2

[0096] S3. Start the aeration module to perform aeration and descaling treatment on the anode and cathode;

[0097] When reverse electrolysis is performed, the air compressor and circulation pump are started by the controller. The air compressor delivers high-pressure air to the aeration pipe and finally enters the reactor from the exhaust port. The high-speed air will flush the cathode and anode, thereby washing away the softened dirt and effectively improving the descaling effect.

[0098] At the same time, the circulating pump drives the wastewater circulation. While discharging the dirt, the flowing wastewater will also flush the anode and cathode, further achieving the separation of dirt and improving the dirt separation effect.

[0099] The aeration descaling treatment time is 1-2 hours. During the water circulation process, the water flow velocity in the reactor is 5-20 m / h, and the aeration intensity is 5-15 L / m. 2 ·s;

[0100] S4. Detect the voltage rise value ΔU of the reactor. If ΔU is greater than 0.5V, the dirt cleaning is unqualified; otherwise, the dirt cleaning is qualified.

[0101] After the aeration descaling treatment is completed, and the system has been running stably for a period of time, the voltage inside the reactor is checked. When the voltage rise ΔU≤0.5V, it is determined that the dirt on the electrode surface does not affect the operation of the system and can continue to operate normally.

[0102] When the voltage value increases by ΔU > 0.5V, it indicates that the dirt on the electrode surface has not been properly cleaned.

[0103] S5. If the dirt removal is not up to standard, start the aeration module for secondary aeration until it is up to standard; otherwise, stop the descaling process.

[0104] S51. Detect the pH of the wastewater. If the pH is ≥ 2, add acid to the reactor until the pH of the wastewater in the reactor is < 2. If the pH is < 2, no acid needs to be added.

[0105] If the dirt removal is deemed unqualified, a secondary aeration process is initiated. First, the pH of the wastewater is tested. If the pH is ≥ 2, acid solution, such as hydrochloric acid, is added to the reactor to adjust the acidity of the wastewater in the reactor until the pH of the wastewater in the reactor is < 2.

[0106] S52. Start the aeration module to perform secondary aeration on the anode and cathode, wherein the aeration intensity of the secondary aeration is 5-15 L / m. 2 ·s;

[0107] After the acid solution is adjusted, the air compressor is restarted to perform secondary aeration on the anode and cathode, with an aeration intensity of 5-15 L / m³. 2 ·s;

[0108] S53. Start the circulation pump and simultaneously control the residence time of the wastewater in the reactor to be 1-10 minutes.

[0109] Start the circulating pump at the same time as starting the air compressor, and control the residence time of the wastewater in the reactor to be 1-10 minutes.

[0110] Compared with the prior art, the descaling device described in this application generates a large amount of OH- ions near the interface between the cathode and water during the forward electrolysis treatment of wastewater. - Due to the attraction of electrostatic forces, calcium and magnesium ions in the water migrate towards the cathode, forming scale-forming substances such as calcium carbonate, magnesium carbonate, and magnesium hydroxide on the cathode surface. This application changes the electrode connection method, connecting the cathode to the positive terminal of the power supply and the anode to the negative terminal. After the electrode switch, the original anode will operate as the cathode, and the original cathode will operate as the anode. This changes the acid-base environment near the electrode surface, disrupting the scaling conditions and making it easier for scale to peel off from the electrode surface. At the same time, the adhesion of the dirt is weakened by aeration and flushing of the cathode surface, further accelerating the removal of dirt and effectively improving the dissolution and separation effect of dirt. In the acidic environment, the dirt dissolves and disappears, thus achieving the purpose of efficient descaling.

[0111] Compared with existing technologies, firstly, after the electrodes are reversed, the scale generated on the original cathode surface can be quickly peeled off and completely dissolved and disappears, resulting in thorough and efficient descaling.

[0112] Secondly, this application can achieve descaling by changing the electrode connection method, and at the same time, the electrolytic oxidation treatment of wastewater can still be achieved during the descaling process. That is, the entire descaling and wastewater treatment can be carried out simultaneously, eliminating the need to stop the machine to remove dirt, thus effectively improving production efficiency.

[0113] Finally, the entire device has a simple structure, and the above functions can be achieved by switching the circuit module, the aeration module, and the circulation pump, which reduces the equipment investment cost.

[0114] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An electrolytic oxidation treatment device with descaling function, characterized in that, Includes power supply (1); Reactor (2), wherein an anode (3) and a cathode (4) are provided on the reactor (2); A circuit switching module, wherein the input terminal of the circuit switching module is electrically connected to the power supply (1), and the anode (3) and cathode (4) are electrically connected to the output terminal of the circuit switching module respectively. The circuit switching module is used to reverse the connection state of the anode (3) and cathode (4) with the power supply (1). An aeration module is disposed inside the reactor (2); The controller (5) is electrically connected to the power supply (1), the circuit switching module and the aeration module respectively; The circuit switching module includes a housing (6), in which an adjusting valve core (7) is slidably disposed. The adjusting valve core (7) is provided with a first wiring area (8) and a second wiring area (9) with opposite wiring states. The housing (6) is also provided with a plurality of elastic connectors (10). One end of each elastic connector (10) is connected to the positive terminal, negative terminal, anode (3) and cathode (4) of the power supply (1), respectively, and the other end is electrically connected to the first wiring area (8) or the second wiring area (9). The housing (6) is also provided with a push-pull electromagnet (11) connected to the adjusting valve core (7). The first wiring area (8) and the second wiring area (9) are each provided with a positive electrode conductive sheet (12), a negative electrode conductive sheet (13), an anode conductive sheet (14), and a cathode conductive sheet (15). The positive electrode conductive sheet (12), the negative electrode conductive sheet (13), the anode conductive sheet (14), and the cathode conductive sheet (15) correspond to each of the elastic connectors (10). The anode conductive sheet (14) in the first wiring area (8) is connected to the positive electrode conductive sheet (12), and the cathode conductive sheet (15) is connected to the negative electrode conductive sheet (13). The anode conductive sheet (14) in the second wiring area (9) is connected to the negative electrode conductive sheet (13), and the cathode conductive sheet (15) is connected to the positive electrode conductive sheet (12). The aeration module includes an aeration pipe (22) and an air compressor (23), wherein the aeration pipe (22) is located at the bottom of the reactor (2), and along the axis of the aeration pipe (22), one end of the aeration pipe (22) is connected to the exhaust pipe of the air compressor (23); Along the axis of the aeration pipe (22), a plurality of exhaust holes (24) are arranged sequentially on the outer circumferential surface of the aeration pipe (22), and the exhaust holes (24) are evenly distributed. The exhaust holes (24) are divided into two groups, and the two groups of exhaust holes (24) are respectively located directly below the anode (3) and the cathode (4).

2. The electrolytic oxidation treatment device with descaling function according to claim 1, characterized in that, Both the first wiring area (8) and the second wiring area (9) are provided with a plurality of T-shaped insertion slots (16). The positive electrode conductive sheet (12), negative electrode conductive sheet (13), anode conductive sheet (14) and cathode conductive sheet (15) each include an integrally connected base plate (17) and abutment plate (18). The base plate (17) is inserted into the insertion slot (16). Along the moving direction of the regulating valve core (7), both ends of the abutment plate (18) are inclined and provided with guide surfaces (19).

3. The electrolytic oxidation treatment device with descaling function according to claim 2, characterized in that, The first wiring area (8) and the second wiring area (9) on the regulating valve core (7) are each provided with at least two wire holes (20), and each wire hole (20) is provided with a connecting wire (21).

4. The electrolytic oxidation treatment device with descaling function according to claim 1, characterized in that, The elastic joint (10) includes a housing (101) and a conductive rod (102) slidably disposed within the housing (101). The housing (101) is connected to the housing (6). A return spring (103) is also disposed within the housing (101). A compression ring (104) is disposed on the conductive rod (102). The return spring (103) abuts against the housing (101) and the compression ring (104) respectively.

5. An electrolytic oxidation treatment device with descaling function according to claim 1, characterized in that, It also includes a circulation pump (25), the inlet of which is connected to the reactor (2) via a suction pipe (26), and the outlet of which is connected to the reactor (2) via a water supply pipe (27).

6. A descaling method based on the electrolytic oxidation treatment device with descaling function according to any one of claims 1-5, characterized in that, Includes the following steps: Wastewater is treated by forward electrolysis by switching the circuit to activate the circuit. Reverse electrolysis is performed by switching the module's wiring state through a circuit. Start the aeration module and circulation pump to perform aeration and descaling treatment on the anode and cathode; The voltage rise value ΔU of the reactor is detected. If ΔU is greater than 0.5V, the scale removal is unqualified; otherwise, the scale removal is qualified. If the scale removal is qualified, the descaling is stopped and forward electrolysis continues. If the scale removal is not up to standard, start the aeration module and circulation pump for secondary aeration until it meets the standard; otherwise, stop the scale removal process.

7. The descaling method according to claim 6, characterized in that, The secondary aeration includes the following steps: Test the pH of the wastewater. If the pH is ≥ 2, add acid to the reactor until the pH of the wastewater in the reactor is < 2; if the pH is < 2, no acid needs to be added. The aeration module is activated to provide secondary aeration to the anode and cathode, with an aeration intensity of 5-15 L / m³. 2 ·s; Start the circulation pump and simultaneously control the residence time of the wastewater in the reactor to be 1-10 minutes.

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