An electrochemical device and method for air-source heat pump water treatment

Abstract

This invention relates to the field of electrolytic circulating water technology, specifically to an electrochemical device and method for air-source heat pump water treatment. The device includes a filter, an outlet, and an inlet, with the outlet and inlet diagonally distributed on the filter. The inlet is located above the side of the filter. The device further includes a porous titanium filter element, a PTFE microfiltration membrane, and a titanium mesh. The porous titanium filter element is coated with a catalytic layer, and the titanium mesh is annular. The porous titanium filter element, PTFE microfiltration membrane, and titanium mesh are vertically and concentrically installed inside the filter from the inside out. This invention uses a porous titanium filter element as the cathode, a titanium mesh as the anode, and a PTFE microfiltration membrane to separate the anode and cathode chambers for water softening via electrolysis. It also allows for backwashing to remove the filter cake layer from the porous titanium filter element. The upward flow of water from the nozzle further aids in the diffusion of Ca near the porous titanium filter element. 2+ This improves backwashing efficiency, allowing the porous titanium filter element to continue to be used even after reverse backwashing.

Description

Technical Field

[0001] This invention relates to the field of electrolytic circulating water technology, and more specifically to an electrochemical device and method for air-source heat pump water treatment. Background Technology

[0002] In air source heat pump water treatment, heat pump technology is used to transfer heat energy from the air to the water to heat it. During the air source heating process, calcium deposits are easily formed. Therefore, it is usually necessary to use only soft water as the water source and add salt or corresponding compounds to remove hardness. However, using only soft water depends on soft water equipment, which is costly. Adding salt will also cause calcium deposits in the water pipes, making maintenance complicated.

[0003] In the heating process of air source water treatment, electrochemical descaling can be used to remove hardness from the water pipes. During electrochemical descaling, a large number of hydroxide ions are generated near the cathode under electrolysis conditions. These hydroxide ions combine with metal ions to form precipitates, thereby removing hardness. The softened water is then supplied to the air source water treatment system. In this process, a large amount of scale will be generated at the cathode. Membrane cleaning agents (such as dilute hydrochloric acid, oxalic acid, and citric acid) are used to chemically clean the scale accumulated on the membrane surface. However, this process generates a large amount of acidic wastewater, which can easily cause secondary pollution. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides an electrochemical device and method for air-source water treatment, which can effectively solve the problem of how to easily clean the scale on the cathode in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides an electrochemical device for air-source heat pump water treatment, comprising a filter, an outlet, and an inlet. The outlet and inlet are respectively distributed opposite to each other on the filter and are diagonally distributed. The inlet is located above the side of the filter. The device also includes:

[0007] The filter comprises a porous titanium filter element, a PTFE microfiltration membrane, and an annular titanium mesh. The porous titanium filter element is coated with a catalytic layer. The porous titanium filter element, PTFE microfiltration membrane, and annular titanium mesh are vertically concentrically installed inside the filter from the inside out. The porous titanium filter element is the cathode, the annular titanium mesh is the anode, and the PTFE microfiltration membrane separates the cathode chamber from the anode chamber. Both the porous titanium filter element and the annular titanium mesh are connected to a reverse polarity power supply.

[0008] Furthermore, the preparation method of the porous titanium filter element and the annular titanium mesh is as follows:

[0009] S1. Etch the porous titanium filter element or annular titanium mesh in an 8% oxalic acid solution at 90-100℃ for about 2 hours to remove the inert oxide layer on its surface.

[0010] S2. Take a certain amount of citric acid and dissolve it in ethylene glycol at 60℃. After complete dissolution, add SnCl4·5H2O, SbCl3, RuCl3 and IrCl3 respectively in a molar ratio of 77:8:10:5. Stir thoroughly until dissolved to obtain a coating solution. Apply the coating solution evenly to the surface of the titanium substrate.

[0011] S3. After drying in a 100℃ oven for 15 minutes, place it in a 450℃ muffle furnace for 10 minutes. Repeat this process 10 times, and finally calcine it at 500℃ for 1 hour.

[0012] Furthermore, a surge absorption assembly is installed through the bottom of the filter, and a collection assembly is connected to the bottom of the surge absorption assembly. One end of the collection assembly is connected to a plunger pump, which is directly connected to the collection assembly. During reverse backwashing, the plunger pump reciprocates to draw water into and out of the filter through the surge absorption assembly and the collection assembly.

[0013] Furthermore, the surge absorption assembly includes a horn tube rotatably connected to the bottom of the filter. The horn tube includes a conical portion located below the porous titanium filter element and a cylindrical portion formed by the tapering of the bottom of the conical portion. Fan blades are fixedly connected inside the conical portion of the horn tube.

[0014] Furthermore, multiple absorption tubes are fixedly connected through the cylindrical part of the horn tube. The absorption tubes are in contact with the bottom of the filter and are connected to the inside of the horn tube. When the plunger pump draws water, the CaCO3 precipitate at the bottom of the filter is adsorbed through the absorption tubes.

[0015] Furthermore, a fixed disk is fixedly connected inside the cylindrical part of the horn tube, and a movable disk is slidably inserted on the fixed disk via a slide rod. A movable ring is fixedly connected to the bottom of the slide rod of the movable disk. When the plunger pump draws water, the movable disk descends and blocks the fixed disk. When the plunger pump discharges water, the movable disk rises and the movable ring blocks the port of the absorption pipe.

[0016] Furthermore, the absorption tube includes a suction tube portion that is fixedly installed through the cylindrical part of the horn tube. The suction tube portion is connected to the inside of the horn tube and has a downward-facing groove. A shovel plate is fixedly connected to the bottom of the suction tube portion. The shovel plate has multiple triangular protrusions. A rear baffle plate is rotatably connected to the vertical plate of the shovel plate. A filter screen is fixedly connected to the bottom of the rear baffle plate at an incline.

[0017] Furthermore, the collection assembly includes a connecting pipe connecting the horn tube and the plunger pump, a filter disc is installed obliquely inside the connecting pipe, and a filter bag is fixedly connected to the inner side wall of the connecting pipe, with the top of the filter bag located at the bottom of the inclined surface of the filter disc.

[0018] Furthermore, the filter disc includes a fixed filter disc fixedly connected to the inner wall of the connecting pipe, a rotating shaft fixedly connected to the middle of the fixed filter disc, a movable filter disc rotatably connected to the rotating shaft, a rubber plug fixedly connected to the top of the filter bag near the filter disc, the end of the movable filter disc being fixedly connected to the rubber plug, and a blocking plate at the bottom of the fixed filter disc preventing the movable filter disc from rotating downward.

[0019] The method applied to the above-mentioned electrochemical device includes the following steps:

[0020] S1. Prepare a porous titanium filter element with a SnO2-Sb2O5-RuO2-IrO2 catalyst layer and an annular titanium mesh with Ti / SnO2-Sb2O5-RuO2-IrO2, using the porous titanium filter element as the cathode and the annular titanium mesh as the anode;

[0021] S2. After the softening process takes 60 to 150 minutes, the power supply is reverse-washed for 6 to 15 minutes.

[0022] S3, Backwashing Stage: The porous titanium filter element serves as the anode, and the annular titanium mesh as the cathode. A funnel-shaped nozzle directs water upwards from the center of the bottom of the porous titanium filter element. (Ca) 2+ It diffuses outwards, forming CaCO3 precipitate.

[0023] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0024] 1. This invention employs a porous titanium filter element as the cathode, an annular titanium mesh as the anode, and a PTFE microfiltration membrane to separate the anode and cathode chambers for water softening via electrolysis. It also allows for backwashing to remove the filter cake layer from the porous titanium filter element. Combined with the upward flow of water from the funnel, this helps diffuse the Ca2+ near the porous titanium filter element. 2+ This improves backwashing efficiency, allowing the porous titanium filter element to continue to be used even after reverse backwashing.

[0025] 2. By employing the combination of the collection component and the flow absorption component, the CaCO3 precipitate at the bottom of the filter can be agitated and collected using the absorption pipe, preventing the CaCO3 precipitate from accumulating and collecting it. The CaCO3 precipitate is then sucked into the filter bag through the water suction action, thus completing the collection of CaCO3 precipitate and reducing the impact of CaCO3 precipitate on the outlet pipe, thereby reducing the number of times the outlet pipe needs to be repaired. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the filter of the present invention;

[0029] Figure 3 This is a half-sectional view of the present invention;

[0030] Figure 4 This is a half-sectional view of the inrush absorption component of the present invention;

[0031] Figure 5 This is a half-sectional front view of the inrush absorption component of the present invention;

[0032] Figure 6 This is a half-sectional view of the absorption tube of the present invention;

[0033] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle;

[0034] Figure 8 This is a half-sectional view of the connecting pipe of the present invention;

[0035] Figure 9 This is a schematic diagram of the filter disc of the present invention.

[0036] The labels in the diagram represent: 1. Filter; 2. Outlet; 3. Inlet; 4. Porous titanium filter element; 5. PTFE microfiltration membrane; 6. Titanium mesh; 7. Plunger pump; 8. Flow absorption assembly; 801. Horn; 802. Fan blade; 803. Absorption pipe; 8031. Suction pipe section; 8032. Shovel plate; 8033. Back baffle; 8034. Filter screen; 804. Fixed disc; 805. Movable disc; 806. Moving ring; 9. Collection assembly; 901. Connecting pipe; 902. Filter disc; 9021. Fixed filter disc; 9022. Movable filter disc; 9023. Rotating shaft; 9024. Baffle plate; 903. Filter bag; 904. Rubber plug. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] The present invention will be further described below with reference to embodiments.

[0039] Example: An electrochemical device and method for air-source heat pump water treatment, comprising a filter 1, an outlet 2, an inlet 3, a porous titanium filter element 4, a PTFE microfiltration membrane 5, and an annular titanium mesh 6. The outlet 2 and inlet 3 are respectively distributed diagonally on the filter 1, with the inlet 3 located above the side of the filter 1. The porous titanium filter element 4 is coated with a SnO2-Sb2O5-RuO2-IrO2 catalyst layer. The annular titanium mesh 6 is a Ti / SnO2-Sb2O5-RuO2-IrO2 annular titanium mesh 6. The porous titanium filter element 4, the PTFE microfiltration membrane 5, and the annular titanium mesh 6 are vertically concentrically installed inside the filter 1 from the inside out. The porous titanium filter element 4 is the cathode, and the annular titanium mesh 6 is the anode. The PTFE microfiltration membrane 5 separates the cathode chamber and the anode chamber. Both the porous titanium filter element 4 and the annular titanium mesh 6 are connected to a reverse polarity power supply.

[0040] In the softening process of the water system, a porous titanium filter element 4 with Ti / SnO2-Sb2O5-RuO2-IrO2 is used as the cathode. Utilizing the localized strong alkalinity during electrolysis and its own microfiltration function, the crystallization and separation of metal ions such as calcium ions are achieved. During the membrane backwashing stage, the power supply is reversed, and the porous titanium filter element 4 becomes the anode. The hydrogen ions generated by its in-situ electrolysis can dissolve the scale attached to the surface and pores of the porous titanium filter element 4, achieving scale removal. In summary, the microfiltration function of the porous titanium filter element 4 is used to separate and remove scale from the water. After reversing the electrode, it can be used as the anode for in-situ electrolysis to generate H+, replacing traditional membrane cleaning agents to remove scale from the surface of the titanium filter membrane and restore membrane flux. This is a green and efficient electrochemical-microfiltration coupled hardening removal system.

[0041] The specific process is as follows: water enters through inlet 3, passes through the porous titanium filter element 4, PTFE microfiltration membrane 5, and annular titanium mesh 6, and then exits through outlet 2. Outlet 2 and inlet 3 are diagonally distributed. Water enters from the top of filter 1 and exits through outlet 2, which is located below. During the water softening process, the porous titanium filter element 4 acts as the cathode, generating OH- during water electrolysis. - Creating a locally strong alkaline environment to drive HCO3 - To CO3 2- Transformation, CO3 2-Will with Ca 2+ The mixture combines to form insoluble CaCO3 crystals. Under vacuum filtration, smaller crystals deposit within the membrane channels of the porous titanium filter element 4, reducing the membrane pore size. As the reaction proceeds, the CaCO3 crystals are retained on the membrane surface, forming a thin CaCO3 filter cake layer. The longer the filtration time, the denser the CaCO3 filter cake layer becomes. At this point, the formation of the filter cake is the main mechanism of membrane fouling. The porous titanium filter element 4, while acting as a cathode, also performs microfiltration, enabling the separation of CaCO3 crystals from water under vacuum filtration conditions.

[0042] During the reverse polarity backwashing process, the porous titanium filter element 4 acts as the anode. Electrolysis of water generates H+, which dissolves the CaCO3 filter cake layer on the surface of the porous titanium filter element 4 and the CaCO3 deposits in the pores, achieving in-situ backwashing of the membrane and restoring the membrane flux of the porous titanium filter element 4. After backwashing, it can continue to be used, reducing the cost of disassembly and maintenance. The water after reverse polarity backwashing is discharged from the outlet 2, carrying the sediment with it.

[0043] Among them, when the membrane pore size is 1µm for the filter, 2µm for the outlet, and 5µm for the PTFE microfiltration membrane, the average calcium hardness removal rates are 80%, 79%, and 72%, respectively. The larger the membrane pore size of the porous titanium filter element 4, the greater the resistance before backwashing. In constant flow mode, increasing the membrane pore size increases membrane fouling resistance while decreasing the inherent resistance of the membrane. Furthermore, the larger the membrane pore size and the longer the filtration cycle, the more CaCO3 crystals are generated on the surface of the porous titanium filter element 4, resulting in a longer backwashing time. Conversely, the smaller the membrane pore size, the higher the convective mass transfer efficiency, i.e., Ca... 2+ and HCO3 - The easier it is to transfer mass to the cathode surface, the better the softening effect. Although a smaller membrane pore size is beneficial for removing calcium hardness, the membrane fouling rate is also faster. CaCO3 formed on the surface and in the pores of the titanium filter membrane will cause titanium filter membrane fouling and increase transmembrane resistance. Therefore, a porous titanium filter element 4 with a pore size between 2µm at the outlet and 5µm for the PTFE microfiltration membrane can be selected. The reverse backwashing time can be controlled within six to fifteen minutes, and the rate of increase in transmembrane resistance will not increase too quickly.

[0044] Specifically, the preparation methods for the porous titanium filter element 4 and the annular titanium mesh 6 are as follows:

[0045] S1. Etch the porous titanium filter element 4 or the annular titanium mesh 6 in an 8% oxalic acid solution at 90-100℃ for about 2 hours to remove the inert oxide layer on its surface.

[0046] S2. Take a certain amount of citric acid and dissolve it in ethylene glycol at 60℃. After complete dissolution, add SnCl4·5H2O, SbCl3, RuCl3 and IrCl3 respectively in a molar ratio of 77:8:10:5. Stir thoroughly until dissolved to obtain a coating solution. Apply the coating solution evenly to the surface of the titanium substrate.

[0047] S3. After drying in a 100℃ oven for 15 minutes, place it in a 450℃ muffle furnace for 10 minutes. Repeat this process 10 times, and finally calcine it at 500℃ for 1 hour.

[0048] A surge absorption assembly 8 is installed through the bottom of the filter 1. A collection assembly 9 is connected to the bottom of the surge absorption assembly 8. A plunger pump 7 is connected to one end of the collection assembly 9. The plunger pump 7 is directly connected to the collection assembly 9. During reverse backwashing, the plunger pump 7 draws water into the filter 1 and discharges water through the surge absorption assembly 8 and the collection assembly 9.

[0049] Specifically, the surge absorption assembly 8 includes a horn 801 rotatably connected to the bottom of the filter 1. The horn 801 includes a conical portion located below the porous titanium filter element 4 and a cylindrical portion formed by the tapering of the bottom of the conical portion. A fan blade 802 is fixedly connected inside the conical portion of the horn 801.

[0050] When selecting plunger pump 7, the two one-way valves on plunger pump 7 need to be removed, using only the two actions of plunger pump 7 pushing outward and sucking water inward. Alternatively, a motor can be used to drive the eccentric wheel to rotate, driving the piston to reciprocate. The internal structure and principle of both are the same, and they are directly connected to the bottom of the bell tube 801, enabling reciprocating suction and water movement in the filter 1. During the water softening process, plunger pump 7 stops. During the reverse backwashing stage, plunger pump 7 starts, sucking in water from the filter 1 and then pushing it out. When the water flows upward from the bell tube 801, it can dissolve the Ca generated near the surface of the porous titanium filter element 4. 2+ Carry upwards to avoid Ca near the surface of the porous titanium filter element 4. 2+ It produces supersaturation, and also helps Ca 2+ After leaving, CO3 near the surface of the annular titanium mesh 6 2- The substances combine to form a precipitate, which helps remove scale from the surface and pores of the porous titanium filter element 4. At the same time, when the plunger pump 7 draws water, it will draw the CaCO3 precipitate at the bottom of the filter 1 into the bell cylinder 801. The collection component 9 helps filter the CaCO3 precipitate and reduces the scale buildup in the bell cylinder 801.

[0051] Specifically, multiple absorption pipes 803 are fixedly connected through the cylindrical part of the bell tube 801. The absorption pipes 803 are in contact with the bottom of the filter 1 and are connected to the inside of the bell tube 801. When the plunger pump 7 draws water, the CaCO3 precipitate at the bottom of the filter 1 is adsorbed through the absorption pipes 803. A fixed plate 804 is fixedly connected inside the cylindrical part of the bell tube 801. A movable plate 805 is slidably inserted into the fixed plate 804 through a slide rod. A moving ring 806 is fixedly connected to the bottom of the slide rod of the movable plate 805. When the plunger pump 7 draws water, the movable plate 805 descends and blocks the fixed plate 804. When the plunger pump 7 discharges water, the movable plate 805 rises and the moving ring 806 blocks the port of the absorption pipe 803.

[0052] As water flows upward from the horn 801, the water flow acts on the fan blades 802. This water flow drives the fan blades 802, causing the horn 801 and the surrounding absorption pipes 803 to rotate. This rotation distributes the water pressure evenly at the bottom of the porous titanium filter element 4, reducing localized excessive pressure caused by uneven water pressure distribution, which can lead to calcium loss. 2+ In cases of uneven distribution, the rotation of the absorption tube 803 will agitate the CaCO3 precipitate at the bottom of the filter 1, preventing the CaCO3 precipitate from agglomerating into large particles during the precipitation process. This reduces the risk of large CaCO3 particles forming scale and clogging in the outlet 2 when they are discharged from the outlet 2.

[0053] The fixed disc 804, the movable disc 805, and the moving ring 806 together form a one-way valve. Water can flow from the bell-shaped tube 801 inwards, but cannot flow into the bell-shaped tube 801. When the plunger pump 7 performs the suction action, the movable disc 805 is pressed down and blocks the top of the fixed disc 804, and the moving ring 806 moves down accordingly, losing its blockage of the absorption pipe 803. Water cannot flow into the top of the bell-shaped tube 801. When water is discharged, the movable disc 805 and the moving ring 806 move up, and the moving ring 806 moves up and blocks the port of the absorption pipe 803. Water can flow out stably from the top of the bell-shaped tube 801. During the suction process, water can only be drawn inwards through the absorption pipe 803. Therefore, the CaCO3 precipitate at the bottom of the filter 1 can be drawn into the cylindrical part of the bell-shaped tube 801 through the absorption pipe 803 and flow into the collection assembly 9 and be collected, reducing the formation of scale at the outlet 2 when the CaCO3 precipitate is discharged from the outlet 2.

[0054] The absorption tube 803 includes a suction tube portion 8031 ​​that is fixedly installed through the cylindrical part of the horn tube 801. The suction tube portion 8031 ​​communicates with the interior of the horn tube 801 and has a downward-facing groove. A spade plate 8032 is fixedly connected to the bottom of the suction tube portion 8031. The spade plate 8032 has multiple triangular protrusions. A rear baffle 8033 is rotatably connected to the vertical plate of the spade plate 8032. A filter screen 8034 is fixedly connected to the bottom of the rear baffle 8033 at an incline.

[0055] During the stage of water discharge from the horn 801, the horn 801 rotates slowly, and the shovel 8032 faces the overall rotation direction of the absorption pipe 803. That is, during the rotation of the absorption pipe 803, the shovel 8032 can scoop up the CaCO3 sediment at the bottom of the filter 1, and during the continuous rotation, the water flow pushes the CaCO3 sediment inward, causing it to settle between the triangular protrusions on the shovel 8032. At the same time, the water flow can push open the rear baffle 8033, causing the rear baffle 8033 to rotate outward of the absorption pipe 803. The filter screen 8034 is then turned outward after the rear baffle 8033 flips over. The process prevents CaCO3 precipitates from sliding off the surface of the shovel plate 8032 and from flowing with the water. When the absorption pipe 803 draws water, it can suck the CaCO3 precipitates on the surface of the shovel plate 8032 into the collection component 9. This completes the collection of CaCO3 precipitates, reducing the impact of CaCO3 precipitates on the filter 1, outlet 2, and corresponding pipes. The scale in the flow absorption component 8 and collection component 9 can be cleaned regularly. Furthermore, the flow absorption component 8 and collection component 9 are not directly connected to the overall water system, making them easy to maintain.

[0056] The collecting assembly 9 includes a connecting pipe 901 connecting the horn 801 and the plunger pump 7. A filter disc 902 is installed obliquely inside the connecting pipe 901. A filter bag 903 is fixedly connected to the inner wall of the connecting pipe 901. The top of the filter bag 903 is located at the bottom of the inclined surface of the filter disc 902. The filter disc 902 includes a fixed filter disc 9021 fixedly connected to the inner wall of the connecting pipe 901. A rotating shaft 9023 is fixedly connected to the middle of the fixed filter disc 9021. A movable filter disc 9022 is rotatably connected to the rotating shaft 9023. A rubber plug 904 is fixedly connected to the top of the filter bag 903 near the side of the filter disc 902. The end of the movable filter disc 9022 is fixedly connected to the rubber plug 904. The bottom of the fixed filter disc 9021 has a blocking plate 9024 that prevents the movable filter disc 9022 from rotating downward.

[0057] The bottom of the bell-shaped tube 801 is connected to the connecting pipe 901 via a rotary joint. When water flows into the connecting pipe 901, external CaCO3 precipitates enter the connecting pipe 901 through the absorption pipe 803 and are blocked by the filter disc 902. Correspondingly, some CaCO3 precipitates enter the filter bag 903. With the flushing of the water flow, the inclined filter disc 902 guides the CaCO3 precipitates to slide into the filter bag 903. Conversely, when water flows out of the connecting pipe 901, part of the movable filter disc 9022 is impacted upwards by the water flow, causing it to rotate around the pivot 9023. The movable filter disc 9022 and the rubber plug 904 will move closer to the inner wall of the connecting pipe 901. Therefore, under the impact of the water flow, the movable filter disc 9022, along with the rubber plug 904, moves upwards and closer to the inner wall of the connecting pipe 901, making the rubber plug 904 tightly adhere to the inside of the connecting pipe 901. On the side wall, the port of filter bag 903 is sealed, and the moving filter plate 9022 is prevented from rising further. In this way, the rubber plug 904 can complete the collection of CaCO3 precipitate. Correspondingly, the CaCO3 precipitate on the fixed filter plate 9021 and the moving filter plate 9022 will also slide into the filter bag 903 under the guidance of the tilt direction. When the water flows upward, the rubber plug 904 seals the port of filter bag 903, which also reduces the upward backflow of CaCO3 precipitate. In this way, during the reverse polarity backwashing process, the CaCO3 precipitate on the porous titanium filter element 4 will be electrolyzed and formed on the outside of the annular titanium mesh 6. After that, it will be sucked into the connecting pipe 901 by the absorption pipe 803 and collected by the rubber plug 904. This avoids the CaCO3 precipitate from affecting other components in the softening pipeline. The wastewater after reverse polarity backwashing can be discharged from the outlet 2.

[0058] The method applied to the above-mentioned electrochemical device includes the following steps:

[0059] S1. Prepare a porous titanium filter element 4 with a SnO2-Sb2O5-RuO2-IrO2 catalyst layer and an annular titanium mesh 6 with Ti / SnO2-Sb2O5-RuO2-IrO2, using the porous titanium filter element 4 as the cathode and the annular titanium mesh 6 as the anode.

[0060] S2. After the softening process takes 60 to 150 minutes, the power supply is reverse-washed for 6 to 15 minutes.

[0061] S3, the reverse washing stage, with the porous titanium filter element 4 as the anode and the annular titanium mesh 6 as the cathode, a horn-shaped tube 801 is used to direct the upward flow of water from the bottom center of the porous titanium filter element 4. Ca 2+ It diffuses outwards, forming CaCO3 precipitate.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrochemical device for air-source heat pump water treatment, comprising a filter (1), an outlet (2), and an inlet (3), wherein the outlet (2) and the inlet (3) are diagonally distributed on the filter (1), and the inlet (3) is located above the side of the filter (1), characterized in that, Also includes: The porous titanium filter element (4), PTFE microfiltration membrane (5), and annular titanium mesh (6) are provided. The porous titanium filter element (4) is coated with a catalytic layer. The porous titanium filter element (4), PTFE microfiltration membrane (5), and annular titanium mesh (6) are vertically and concentrically installed in the filter (1) from the inside to the outside. The porous titanium filter element (4) is the cathode, the annular titanium mesh (6) is the anode, and the PTFE microfiltration membrane (5) separates the cathode chamber from the anode chamber. The porous titanium filter element (4) and the annular titanium mesh (6) are both connected to the reverse polarity power supply. A flow absorption assembly (8) is installed through the bottom of the filter (1). A collection assembly (9) is connected to the bottom of the flow absorption assembly (8). A plunger pump (7) is connected to one end of the collection assembly (9). The plunger pump (7) is directly connected to the collection assembly (9). During reverse backwashing, the plunger pump (7) draws water into and discharges water into the filter (1) through the flow absorption assembly (8) and the collection assembly (9). The collection assembly (9) includes a connecting pipe (901) connecting the horn tube (801) and the plunger pump (7). A filter disc (902) is installed obliquely inside the connecting pipe (901). A filter bag (903) is fixedly connected to the inner side wall of the connecting pipe (901). The top of the filter bag (903) is located at the bottom of the inclined surface of the filter disc (902). The filter disc (902) includes a fixed filter disc (9021) fixedly connected to the inner wall of the connecting pipe (901). A rotating shaft (9023) is fixedly connected to the middle of the fixed filter disc (9021). A movable filter disc (9022) is rotatably connected to the rotating shaft (9023). A rubber plug (904) is fixedly connected to the top of the filter bag (903) near the filter disc (902). The end of the movable filter disc (9022) is fixedly connected to the rubber plug (904). The bottom of the fixed filter disc (9021) has a blocking plate (9024) that prevents the movable filter disc (9022) from rotating downward.

2. The electrochemical device for air-source heat pump water treatment according to claim 1, characterized in that, The porous titanium filter element (4) and the annular titanium mesh (6) are prepared by: S1. Etch the porous titanium filter element (4) or the annular titanium mesh (6) in an oxalic acid solution with a mass fraction of 8% at 90-100℃ for 2 hours to remove the inert oxide layer on its surface. S2. Dissolve citric acid in ethylene glycol at 60°C. After complete dissolution, add SnCl4·5H2O, SbCl3, RuCl3 and IrCl3 in a molar ratio of 77:8:10:5 respectively. Stir thoroughly until dissolved to obtain a coating solution. Apply the coating solution evenly to the surface of the titanium substrate. S3. After drying in a 100℃ oven for 15 minutes, place it in a 450℃ muffle furnace for 10 minutes. Repeat this process 10 times, and finally calcine it at 500℃ for 1 hour.

3. The electrochemical device for air-source heat pump water treatment according to claim 1, characterized in that, The surge absorption assembly (8) includes a horn tube (801) rotatably connected to the bottom of the filter (1). The horn tube (801) includes a conical part below the porous titanium filter element (4) and a cylindrical part formed by the tapering of the bottom of the conical part. A fan blade (802) is fixedly connected inside the conical part of the horn tube (801).

4. An electrochemical device for air-source heat pump water treatment according to claim 3, characterized in that, Multiple absorption tubes (803) are fixedly connected through the cylindrical part of the horn tube (801). The absorption tubes (803) are in contact with the bottom of the filter (1). The absorption tubes (803) are connected to the inside of the horn tube (801). When the plunger pump (7) draws water, it adsorbs the CaCO3 precipitate at the bottom of the filter (1) through the absorption tubes (803).

5. An electrochemical device for air-source heat pump water treatment according to claim 4, characterized in that, A fixed disk (804) is fixedly connected inside the cylindrical part of the horn tube (801). A movable disk (805) is slidably inserted on the fixed disk (804) via a slide rod. A movable ring (806) is fixedly connected to the bottom of the slide rod of the movable disk (805). When the plunger pump (7) draws water, the movable disk (805) descends and blocks the fixed disk (804). When the plunger pump (7) discharges water, the movable disk (805) rises and the movable ring (806) blocks the port of the absorption pipe (803).

6. An electrochemical device for air-source heat pump water treatment according to claim 4, characterized in that, The absorption tube (803) includes a suction tube (8031) that is fixedly installed through the cylindrical part of the horn tube (801). The suction tube (8031) communicates with the inside of the horn tube (801) and has a downward-facing groove. A shovel plate (8032) is fixedly connected to the bottom of the suction tube (8031). The shovel plate (8032) has multiple triangular protrusions. A rear baffle (8033) is rotatably connected to the vertical plate of the shovel plate (8032). A filter screen (8034) is fixedly connected to the bottom of the rear baffle (8033) at an incline.

7. A method applied to the electrochemical apparatus for air-source water treatment according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Prepare a porous titanium filter element (4) with a SnO2-Sb2O5-RuO2-IrO2 catalyst layer and an annular titanium mesh (6) with Ti / SnO2-Sb2O5-RuO2-IrO2. Use the porous titanium filter element (4) as the cathode and the annular titanium mesh (6) as the anode. S2. After the softening process takes 60 to 150 minutes, the power supply is reverse-washed for 6 to 15 minutes. S3, Reverse washing stage: The porous titanium filter element (4) serves as the anode, and the annular titanium mesh (6) serves as the cathode. A horn tube (801) is used to direct water flow upward from the bottom center of the porous titanium filter element (4). 2+ It diffuses outwards, forming CaCO3 precipitate.

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