Electrochemical descaling device

Abstract

The utility model discloses an electrochemical descaling device. The electrochemical descaling device comprises an electrolytic bath, an electrode device, a power supply device and a water circulation device, the electrode device is composed of a first rotary drum and a second rotary drum which are coaxially arranged, the diameter of the second rotary drum is larger than that of the first rotary drum, and the first rotary drum and the second rotary drum synchronously rotate through a rotary driving component. And the positive electrode of the power supply device is connected with the first rotary drum, and the negative electrode is connected with the second rotary drum. The water circulation device is connected with the bottom and the top of the electrolytic cell through water inlet and outlet pipelines with the pipe diameter ratio being 2-3 times and matched with a water pump to achieve circulation. And scale on the surface of the second rotary drum is removed through a descaling scraper compressed by a spring, and scraped scale slag is guided into a slag container through the descaling scraper. The device is additionally provided with a water scaling detection module, combines with a controller and a potential adjusting unit to monitor and dynamically adjust electrolysis voltage in real time, and cooperates with a current sensor and an alarm to realize operation state monitoring. The device effectively improves the descaling efficiency and prolongs the service life of the electrode through the combination of the rotating electrode and intelligent electric control, and is suitable for a water treatment system.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to an electrochemical descaling device. Background Technology

[0002] Scale buildup is a common problem in water systems during industrial production and daily life, severely impacting the heat exchange efficiency and lifespan of equipment. Traditional descaling methods include chemical treatment and mechanical scraping, but these methods suffer from environmental pollution, equipment damage, and operational complexity. Electrochemical descaling technology, as an emerging method, offers advantages such as environmental friendliness, high efficiency, and ease of operation.

[0003] Chinese Patent, Publication No. CN105540955A, Publication Date: May 4, 2016, discloses an electrochemical descaling device to solve the problems of incomplete descaling, high descaling cost, and difficulty in descaling of traditional electrochemical descaling devices. The device includes a descaling body, a raw water inlet pipeline system, an ultrasonic cleaning system, a waste residue discharge system, and an automatic control system. The raw water inlet pipeline system, the ultrasonic cleaning system, and the waste residue discharge system are respectively connected to the descaling body, and the automatic control system is respectively connected to the descaling body, the raw water inlet pipeline system, the ultrasonic cleaning system, and the waste residue discharge system.

[0004] Its drawback is that the device performs electrode descaling in the following way: "When the invention is working, the current in the electrolysis reaction zone 7 remains constant. When the electrolysis voltage is higher than the set value, the water intake is stopped, and the ultrasonic generator 20 is started to perform descaling. After descaling is completed, the slag discharge pipe 22 is opened through the slag discharge valve 23 to remove the scale. After descaling, if the voltage of the descaling body 1 is still higher than the set value in the initial working stage, acid washing and / or reverse electrode circuit are selected in sequence for deep descaling." This descaling method requires the machine to be shut down for descaling. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this application is to provide an electrochemical descaling device that can achieve electrode descaling without shutting down the machine.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] This application provides an electrochemical descaling device, comprising: an electrolytic cell; an electrode device installed inside the electrolytic cell, the electrode device including a first rotating drum and a second rotating drum coaxially arranged, the diameter of the second rotating drum being larger than the diameter of the first rotating drum, and a rotation drive component for driving the first rotating drum and the second rotating drum to rotate; a power supply device including a DC power supply, the positive terminal of the DC power supply being connected to the first rotating drum and the negative terminal of the DC power supply being connected to the second rotating drum; a water circulation device including an inlet pipe and an outlet pipe connected to the electrolytic cell, and a water pump being provided on the inlet pipe and / or the outlet pipe; and a descaling scraper abutting against the outer circumferential surface of the second rotating drum.

[0008] As a preferred technical solution, the first rotating drum is a titanium rotating drum or a ruthenium-iridium plated titanium rotating drum; the second rotating drum is a stainless steel rotating drum or a carbon steel rotating drum.

[0009] As a preferred technical solution, the electrochemical descaling device also includes a water quality scaling detection module, and the power supply device includes a controller and a potential adjustment unit. The water quality scaling detection module is installed inside the electrolytic cell and close to the outer surface of the second rotating drum. The water quality detection module is electrically connected to the controller, and the DC power supply is connected to the controller. The controller is connected to the potential adjustment unit and then to the electrode device to adjust the magnitude of the potential output to both ends of the electrode device.

[0010] As a preferred technical solution, the power supply device includes a power positive and negative conversion module. A DC power supply is connected to the power positive and negative conversion module and then connected to the electrode device. The power positive and negative conversion module has a first state and a second state. When the power positive and negative conversion module is in the first state, the positive terminal of the DC power supply is connected to the first rotating drum, and the negative terminal of the DC power supply is connected to the second rotating drum. When the power positive and negative conversion module is in the second state, the negative terminal of the DC power supply is connected to the first rotating drum, and the positive terminal of the DC power supply is connected to the second rotating drum.

[0011] As a preferred technical solution, the inlet pipe is connected to the bottom of the electrolytic cell, and the outlet pipe is connected to the top of the electrolytic cell. The diameter of the outlet pipe is 2-3 times that of the inlet pipe.

[0012] As a preferred technical solution, the electrochemical descaling device also includes a spring, one end of which is fixedly installed, and the other end of which abuts against the descaling scraper to press the descaling scraper against the second rotating drum.

[0013] As a preferred technical solution, the electrochemical descaling device also includes a slag container, with the lower end of the descaling scraper located directly above the slag container, and the descaling scraper is set at an angle.

[0014] As a preferred technical solution, the electrochemical descaling device also includes a high-pressure water gun for spraying water onto the surface of the second rotating drum.

[0015] As a preferred technical solution, the surface of the second rotating drum is provided with a polytetrafluoroethylene layer.

[0016] As a preferred technical solution, the electrochemical descaling device also includes a current sensor and an alarm, with the controller electrically connected to the current sensor and the alarm electrically connected to the controller.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] In the electrochemical descaling device of this application, the second rotating drum serves as the cathode of the electrode device. The scale layer generated on the surface of the second rotating drum is scraped off by the descaling scraper during the rotation of the second rotating drum. This application can achieve electrode descaling without stopping the machine. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the electrochemical descaling device of this application;

[0020] The components include: 1. Inlet water pipe; 2. Check valve; 3. Outlet water pipe; 4. First rotating drum; 5. Second rotating drum; 6. Descaling scraper; 7. Sludge container; 8. Power supply device. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, this application provides an electrochemical descaling device for descaling in a water system. The electrochemical descaling device includes: an electrolytic cell, an electrode assembly, a power supply unit 8, a water circulation device, and a descaling scraper 6.

[0023] The electrode device is installed inside the electrolytic cell. The electrode device includes a first rotating drum 4 and a second rotating drum 5 arranged coaxially. The diameter of the second rotating drum 5 is larger than the diameter of the first rotating drum 4.

[0024] In this application, the first rotating cylinder 4 is a titanium rotating cylinder or a ruthenium-iridium-plated titanium rotating cylinder; the second rotating cylinder 5 is a stainless steel rotating cylinder or a carbon steel rotating cylinder. The first rotating cylinder 4 is manufactured by bending a titanium plate or a ruthenium-iridium-plated titanium plate into a cylinder with an inner diameter of 32 mm, and fitting it onto the outer surface of a central shaft. The second rotating cylinder 5 is manufactured by bending a stainless steel plate or a carbon steel plate into a cylinder with an inner diameter of 750 mm, and fixing it to the outer surface of the first rotating cylinder 4 by several support pillars.

[0025] Furthermore, the surface of the second rotating drum 5 is provided with a polytetrafluoroethylene (PTFE) layer. The PTFE layer is an insulating protective layer that isolates the surface of the second rotating drum 5 from the water in the electrolytic cell, inhibiting surface corrosion and interfacial reactions.

[0026] The first rotating drum 4 and the second rotating drum 5 are connected to a rotary drive component for driving the first rotating drum 4 and the second rotating drum 5 to rotate. In this application, the rotary drive component is a servo motor. The output shaft of the servo motor is connected to the central shaft to control the central shaft to rotate counterclockwise at a uniform speed. The rotational speed of the central shaft is controlled by the frequency converter of the servo motor, thereby controlling the rotational speed of the first rotating drum 4 and the second rotating drum 5.

[0027] The power supply device 8 includes a DC power supply. The positive terminal of the DC power supply is connected to the first rotating drum 4, and the negative terminal of the DC power supply is connected to the second rotating drum 5. The first rotating drum 4 serves as the electrolytic anode, and the second rotating drum 5 serves as the electrolytic cathode. An electric field is formed between the anode and the cathode, and scale in the water is removed through electrolysis.

[0028] In one embodiment, the power supply device 8 includes a rectifier for converting alternating current (AC) to direct current (DC).

[0029] Electrochemical descaling and scale prevention technology involves generating OH- at the cathode through oxygen reduction and hydrogen evolution under the influence of an electric field. - Ions create an alkaline environment. It has been determined that in the actual process, equation (2) is the dominant reaction.

[0030] O₂ + 2H₂O + 4e⁻ → 4OH⁻ - (1)

[0031] 2H₂O + 2e⁻ → H₂↑ + 2OH⁻ - (2)

[0032] Under the action of mass transfer, HCO3 in the circulating water - Ions migrate to the cathode surface and undergo the following reaction:

[0033] HCO3 - +OH - →CO3 2- +H2O; (3)

[0034] Ca in circulating water 2+ and Mg 2+ Under the combined influence of mass transfer and electric field, it migrates to the cathode region and reacts with the CO3 generated in the cathode region. 2- and OH - A reaction occurs, forming scale deposits on the cathode surface, which reduces the hardness of the circulating water, as detailed below:

[0035] Ca 2+ +CO3 2- →CaCO3↓; (4)

[0036] Mg 2+ +2OH - →Mg(OH)2↓; (5)

[0037] The reaction that occurs near the anode is as follows:

[0038] H₂O→OH·+H₂ + +e;(6)

[0039] Under the influence of an electric field, Cl in the circulating water － The following electrochemical reaction occurs:

[0040] 2Cl - →Cl2+2e;(7)

[0041] Cl₂ + H₂O → Cl - +ClO - +2H + (8)

[0042] Bacteria and algae in circulating water react with OH· and ClO - A reaction occurs, achieving the purpose of sterilization and algae removal:

[0043] Algae / bacteria + OH· / ClO - →Death / Inactivation; (9)

[0044] It is worth noting that, due to the poor stability of OH·, the reaction of OH· with bacteria and algae occurs in the anodic region. In contrast, the relatively more stable ClO₂... - It can diffuse into the circulating water system. Therefore, the circulating water after electrochemical treatment has a certain ability to inhibit bacteria and algae.

[0045] The water circulation device includes an inlet pipe 1 and an outlet pipe 3 connecting the electrolytic cell. A water pump is installed on the inlet pipe 1 and / or the outlet pipe 3 to introduce water to be treated into the electrolytic cell and discharge the treated water. In this application, an inlet pump is installed on the inlet pipe 1, and a one-way valve 2 is installed on the inlet pipe 1 to prevent water from flowing out of the electrolytic cell along the inlet pipe 1 when the inlet pump stops working.

[0046] Furthermore, the inlet pipe 1 is connected to the bottom of the electrolytic cell, and the outlet pipe 3 is connected to the top of the electrolytic cell, so that the outlet pipe 3 can overflow from a high level. The diameter of the outlet pipe 3 is 2-3 times that of the inlet pipe 1, thereby ensuring that the liquid level in the electrolytic cell will not be too high and cause overflow.

[0047] The descaling scraper 6 abuts against the outer circumferential surface of the second rotating drum 5. During the operation of the electrochemical descaling device, scale gradually accumulates on the outer surface of the second rotating drum 5. As the second rotating drum 5 rotates, the descaling scraper 6 removes the scale from its outer circumferential surface. The width of the descaling scraper 6 is wider than the width of the second rotating drum 5, so that the descaling scraper 6 can remove the scale from the entire outer circumferential surface of the second rotating drum 5.

[0048] The second rotating drum 5 serves as the cathode of the electrode device. The scale layer generated on the surface of the second rotating drum 5 will be scraped off by the descaling scraper 6 during the rotation of the second rotating drum 5. This application can achieve electrode descaling without stopping the machine.

[0049] Furthermore, the electrochemical descaling device also includes a spring, one end of which is fixedly mounted, and the other end of which abuts against the descaling scraper 6 to press the scraper 6 against the second rotating drum 5. Due to insufficient manufacturing precision of the second rotating drum 5, a gap may occur between the descaling scraper 6 and the outer surface of the second rotating drum 5. By pressing the scraper 6 against the second rotating drum 5 with the spring, the scraper 6 is always able to adhere tightly to the outer circumferential surface of the second rotating drum 5, which is beneficial for removing the scale layer from the outer circumferential surface of the second rotating drum 5. On the other hand, the above arrangement can accommodate different thicknesses of scale layers, preventing the scraper 6 from jamming the second rotating drum 5.

[0050] Furthermore, the electrochemical descaling device also includes a sludge container 7, with the lower end of the descaling scraper 6 positioned directly above the sludge container 7, and the descaling scraper 6 is inclined. The scale scraped off from the outer circumference of the second rotating drum 5 will pass over the inclined upper surface of the descaling scraper 6 and fall into the sludge container 7.

[0051] As a preferred technical solution, the electrochemical descaling device also includes a water scale detection module, and the power supply device 8 includes a controller, a current regulation unit, and a voltage regulation unit.

[0052] The water scaling detection module is used to detect whether scale has accumulated on the outer surface of the second rotating drum 5. The water scaling detection module can employ instruments such as a conductivity meter, hardness meter, or scaling susceptibility meter. A conductivity meter determines the degree of scaling by measuring the conductivity of water. Conductivity refers to the rate at which charge carriers move within a unit cross-sectional area of ​​a conductive liquid. As the amount of dissolved minerals in water increases, the conductivity also increases accordingly. By monitoring changes in conductivity, the extent of scaling can be indirectly understood. A hardness meter is an instrument specifically used to measure water hardness. Water hardness refers to the content of dissolved minerals such as calcium and magnesium in water. Water with high hardness is more prone to scaling. A hardness meter can directly measure the hardness value of water, providing a basis for judging water scaling. A scaling susceptibility meter is an instrument specifically used to detect the tendency of water to scale. It assesses the likelihood of scaling by measuring various parameters in the water, such as calcium, magnesium, total hardness, and alkalinity. The scaling susceptibility meter can monitor water quality changes in real time, promptly detect scaling risks, and provide a basis for taking appropriate measures.

[0053] The water quality scaling detection module is installed inside the electrolysis cell and close to the outer surface of the second rotating drum 5. The water quality detection module is electrically connected to the controller to send water quality detection data to the controller.

[0054] It should be noted that when the water scale detection module is a conductivity meter, hardness meter, or scale tendency meter, its collection or detection component is installed inside the electrolysis cell and close to the outer surface of the second rotating drum 5, rather than the conductivity meter, hardness meter, or scale tendency meter being installed entirely inside the electrolysis cell and close to the outer surface of the second rotating drum 5.

[0055] A DC power supply connects to a controller, which in turn connects to a potential regulation unit and then to the electrode device to adjust the potential output to the electrode device. The controller determines the water quality and scale buildup based on water quality testing data and adjusts the current and voltage output to the electrode device accordingly. By optimizing electrode potential control, the activation energy of the reaction on the electrode surface can be adjusted, thereby changing the reaction rate and product distribution, and regulating the hydrogen evolution reaction in water electrolysis.

[0056] For example, the potential adjustment unit is an adjustable load resistor, which is connected in series with the electrode device. By adjusting the resistance of the adjustable load resistor, the potential output to the electrode device can be adjusted.

[0057] Furthermore, the electrochemical descaling device also includes a current sensor and an alarm. The controller is electrically connected to the current sensor, and the alarm is electrically connected to the controller. The current sensor can be connected in series with the aforementioned adjustable load resistor to detect the current passing through the adjustable load resistor. When the current is abnormally high or low, the controller can issue an alarm message through the alarm and stop the electrolytic reaction.

[0058] It should be noted that the current sensor can be replaced by a voltage sensor connected in parallel across the adjustable load resistor to detect the voltage across the adjustable load resistor to obtain the voltage of the electrode device. When the voltage is abnormally high or low, the controller can issue an alarm through the alarm and stop the electrolysis reaction.

[0059] Furthermore, the power supply device includes a power positive and negative conversion module, and the DC power supply is connected to the power positive and negative conversion module before being connected to the electrode device.

[0060] The power supply positive and negative conversion module has a first state and a second state. When the power supply positive and negative conversion module is in the first state, the positive terminal of the DC power supply is connected to the first rotating drum and the negative terminal of the DC power supply is connected to the second rotating drum. When the power supply positive and negative conversion module is in the second state, the negative terminal of the DC power supply is connected to the first rotating drum and the positive terminal of the DC power supply is connected to the second rotating drum.

[0061] As electrolysis proceeds, the scale layer on the surface of the second rotating drum becomes thicker and thicker. After a certain period of time, the electrodes are switched, and the second rotating drum changes from the cathode where the scale layer was originally deposited to the anode where acid is produced, which helps to loosen and automatically remove the scale layer on the surface of the second rotating drum.

[0062] For example, a power supply polarity conversion module can be an automatic commutator switch, a positive / negative power conversion chip, or a DC-DC conversion module. An automatic commutator switch is a device specifically designed for converting the positive and negative terminals of a DC power supply, widely used in the electrolysis and electroplating industries. It solves the problem of high-power switching power supplies being unable to manually switch the positive and negative wires, featuring a simple, fast, and safe commutation process, greatly improving work efficiency. A positive / negative power conversion chip achieves positive / negative power conversion by switching the positive and negative terminals of the input voltage. For example, the ICL7660 chip can convert +5V to -5V, thus providing a positive and negative 5V power supply. A DC-DC conversion module is a device that converts electrical energy from one voltage value to another. Through processes such as oscillation circuits, rectification, and filtering, a 5V to 5V isolated power supply can be achieved, or a polarity reversal switching power supply module can convert +5V to -5V, combining it with the original +5V to form a +-5V power supply.

[0063] As a preferred technical solution, the electrochemical descaling device also includes a high-pressure water gun for spraying water onto the surface of the second rotating drum to clean the outer surface of the second rotating drum and thoroughly remove the stubborn scale layer on the outer surface of the second rotating drum.

[0064] It should be noted that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates at least two. Unless otherwise stated, terms such as "front," "back," "left," "right," "lower," and / or "upper" are for illustrative purposes only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0065] The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0066] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An electrochemical descaling device, characterized in that, The electrochemical descaling device includes: Electrolytic cell; An electrode device is installed inside the electrolytic cell. The electrode device includes a first rotating cylinder and a second rotating cylinder arranged coaxially. The diameter of the second rotating cylinder is larger than the diameter of the first rotating cylinder. The first rotating cylinder and the second rotating cylinder are connected to a rotary drive component for driving the first rotating cylinder and the second rotating cylinder to rotate. A power supply device, comprising a DC power supply, wherein the positive terminal of the DC power supply is connected to the first rotating drum and the negative terminal of the DC power supply is connected to the second rotating drum; A water circulation device, comprising an inlet pipe and an outlet pipe connected to the electrolytic cell, wherein a water pump is provided on the inlet pipe and / or the outlet pipe; A descaling scraper is placed against the outer circumferential surface of the second rotating drum.

2. The electrochemical descaling device of claim 1, wherein, The first rotating drum is a titanium rotating drum or a ruthenium-iridium plated titanium rotating drum; the second rotating drum is a stainless steel rotating drum or a carbon steel rotating drum.

3. The electrochemical descaling device of claim 1, wherein, The electrochemical descaling device also includes a water scale detection module, and the power supply device also includes a controller and a potential adjustment unit. The water scale detection module is installed inside the electrolytic cell and close to the outer surface of the second rotating drum. The water scale detection module is electrically connected to the controller. The DC power supply is connected to the controller. The controller is connected to the potential adjustment unit and then to the electrode device to adjust the magnitude of the potential output to both ends of the electrode device.

4. The electrochemical descaling device according to claim 1 or 3, characterized in that The power supply device includes a power positive / negative conversion module. The DC power supply is connected to the power positive / negative conversion module and then to the electrode device. The power positive / negative conversion module has a first state and a second state. When the power positive / negative conversion module is in the first state, the positive terminal of the DC power supply is connected to the first rotating drum, and the negative terminal of the DC power supply is connected to the second rotating drum. When the power positive / negative conversion module is in the second state, the negative terminal of the DC power supply is connected to the first rotating drum, and the positive terminal of the DC power supply is connected to the second rotating drum.

5. The electrochemical descaling device of claim 1, wherein, The inlet pipe is connected to the bottom of the electrolytic cell, and the outlet pipe is connected to the top of the electrolytic cell. The diameter of the outlet pipe is 2-3 times that of the inlet pipe.

6. The electrochemical descaling device of claim 1, wherein, The electrochemical descaling device also includes a spring, one end of which is fixedly disposed, and the other end of which abuts against the descaling scraper to press the descaling scraper against the second rotating drum.

7. The electrochemical descaling device of claim 1, wherein, The electrochemical descaling device also includes a slag container, with the lower end of the descaling scraper located directly above the slag container, and the descaling scraper is inclined.

8. The electrochemical descaling device of claim 1, wherein, The electrochemical descaling device also includes a high-pressure water gun for spraying water onto the surface of the second rotating drum.

9. The electrochemical descaling device of claim 1, wherein, The surface of the second rotating cylinder is provided with a polytetrafluoroethylene layer.

10. The electrochemical descaling device of claim 3, wherein, The electrochemical descaling device also includes a current sensor and an alarm. The controller is electrically connected to the current sensor, and the alarm is electrically connected to the controller.

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