Anticorrosion cleaning device for tail water circulating cooler

Abstract

This invention discloses an anti-corrosion cleaning device for a tailwater circulating cooler, relating to the field of anti-corrosion and descaling technology for circulating cooling water systems. The invention includes a multi-channel integrated ultrasonic control cabinet, an intelligent constant potential rectifier, an immersion ultrasonic transducer, an MMO titanium-based auxiliary anode, and a reference electrode. The ultrasonic transducer and auxiliary anode are positioned in the water body where the cooler is located, while the reference electrode is positioned in the water body near the cooler. The control cabinet sends ultrasonic drive signals to the transducer, the rectifier outputs cathodic protection current to the cooler via the auxiliary anode, and the reference electrode collects the cooler's potential signal and feeds it back to the rectifier. This invention integrates ultrasonic descaling and cathodic protection anti-corrosion functions, achieving alternating or simultaneous operation through an intelligent collaborative control strategy. It effectively solves the dual problems of scaling and corrosion in coolers, offering advantages such as compact structure, high intelligence, and environmental friendliness. It can significantly extend equipment lifespan and improve heat exchange efficiency.

Description

Technical Field

[0001] This invention belongs to the field of corrosion prevention and descaling of circulating cooling water systems, specifically, it relates to a corrosion prevention and cleaning device for a tailwater circulating cooler. Background Technology

[0002] The tailrace circulating cooler is an auxiliary device used for cooling and reducing the temperature of hydropower station units. This device uses reciprocating circulating cooling water to cool the hydropower station units. The tailrace circulating cooler is usually arranged in the tailrace canal of the hydropower station, and the cooler is completely submerged in the river water. The heat in the circulating cooler is carried away by the cooling water in the river water through the heat exchange principle.

[0003] Because the tailrace circulating cooler is located in the tailrace channel of the hydropower station, it is submerged in the river water for a long time. Dissolved oxygen, trace amounts of chloride ions, carbonates, microorganisms, and silt impurities in the river water can cause multiple damages to the cooler shell, heat exchange tube bundle, and supporting structure, including electrochemical corrosion, scaling corrosion, and microbial corrosion.

[0004] The cooling tube bundles (cathodes) of this type of cooler are immersed in river water for extended periods, facing two prominent technical challenges: 1. Electrochemical Corrosion Problem. River water contains dissolved oxygen, chloride ions, sulfate ions, and other ions, making it highly corrosive. Electrochemical reactions occur on the metal surface of the cooler in the river water, leading to continuous corrosion and thinning of the metal. In severe cases, this can cause pipe wall perforation and leakage, affecting the safe operation and service life of the equipment. Traditional anti-corrosion measures mainly involve applying anti-corrosion coatings, but these coatings are easily eroded by water flow, resulting in reduced anti-corrosion effectiveness. 2. Scale and Microbial Fouling Issues. River water contains hardness ions such as calcium and magnesium, as well as microorganisms such as algae and bacteria, which easily form scale and biofilm on the heat exchange surfaces of coolers. Scale has a much lower thermal conductivity than metal, significantly reducing heat exchange efficiency; biofilm not only affects heat exchange but also accelerates localized corrosion. Currently used descaling methods include mechanical scraping, chemical cleaning, and high-pressure water flushing, but these methods either require shutdown or introduce chemical agents that cause secondary pollution, and the descaling cycle is long and labor-intensive; shutdown also affects the power plant's power generation efficiency.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an anti-corrosion cleaning device for a tailwater circulating cooler, which solves the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A corrosion-resistant cleaning device for a tailwater circulating cooler includes: a multi-channel integrated ultrasonic control cabinet, an intelligent constant potential rectifier, an immersion ultrasonic transducer, and a cathodic protection waterproof and corrosion-resistant cable. The multi-channel integrated ultrasonic control cabinet has an ultrasonic drive module and a control module built in. The intelligent constant potential rectifier is electrically connected to the multi-channel integrated ultrasonic control cabinet, and is also electrically connected to the MMO titanium-based auxiliary anode and the reference electrode, respectively. The submersible ultrasonic transducer is electrically connected to the multi-channel integrated ultrasonic control cabinet via a submersible ultrasonic corrosion-resistant cable. The MMO titanium-based auxiliary anode and the reference electrode are respectively electrically connected to the intelligent constant potential rectifier via the cathode-protected waterproof and corrosion-resistant cable. The submersible ultrasonic transducer and the MMO titanium-based auxiliary anode are located in the river water where the tailwater circulating cooler cathode is located, and the reference electrode is located in the water body near the cooler cathode. The multi-channel integrated ultrasonic control cabinet sends ultrasonic drive signals to the submersible ultrasonic transducer through the submersible ultrasonic anti-corrosion cable. The intelligent constant potential rectifier outputs cathodic protection current to the cooler cathode through the cathodic protection waterproof and anti-corrosion cable and the MMO titanium-based auxiliary anode. The reference electrode collects the potential signal of the cooler cathode and feeds it back to the intelligent constant potential rectifier.

[0008] Optionally, the multi-channel integrated ultrasonic control cabinet includes: An ultrasonic generator is used to generate high-frequency ultrasonic electrical signals. A power amplifier module, electrically connected to the ultrasonic generator, is used to amplify the power of the ultrasonic electrical signal; An impedance matching network, electrically connected to the power amplification module, is used to match the impedance of the submersible ultrasonic transducer. The control module is a PLC controller, which is communicatively connected to the ultrasonic generator, the power amplifier module and the intelligent constant potential rectifier. It is used to control the ultrasonic output parameters and work in coordination with the intelligent constant potential rectifier.

[0009] Optionally, the intelligent constant potential rectifier includes: A rectifier module is used to convert alternating current (AC) to direct current (DC). The constant potential control module is electrically connected to the rectifier module and has a built-in negative feedback closed-loop control circuit, which is used to automatically adjust the output current and output voltage according to the potential signal fed back by the reference electrode. The output terminals are electrically connected to the MMO titanium-based auxiliary anode and the cooler cathode, respectively. The input terminal of the reference electrode is electrically connected to the reference electrode terminal of the constant potential control module.

[0010] Optionally, the MMO titanium-based auxiliary anode is an MMO-coated titanium-based auxiliary anode, which is placed in the river water surrounding the cathode of the cooler as the anode of the cathodic protection system.

[0011] Optionally, the submersible ultrasonic transducer is disposed on the surface of the cooler cathode or in river water adjacent to the cooler cathode, for emitting ultrasonic waves onto the surface of the cooler cathode to remove scale and microbial film adhering to the surface of the cooler cathode.

[0012] Optionally, the immersion ultrasonic anti-corrosion cable is a water-resistant and corrosion-resistant shielded cable, and the cathodic protection waterproof anti-corrosion cable is a water-resistant and corrosion-resistant waterproof cable.

[0013] Optionally, the multi-channel integrated ultrasonic control cabinet has multiple output channels, and each output channel is connected to one or more of the submersible ultrasonic transducers via an independent submersible ultrasonic corrosion-resistant cable.

[0014] Optionally, the intelligent constant potential rectifier has multiple output circuits, each of which is connected to a set of MMO titanium-based auxiliary anodes and reference electrodes via independent cathodic protection waterproof and corrosion-resistant cables.

[0015] Optionally, a remote monitoring module is also included. The remote monitoring module is communicatively connected to the multi-channel integrated ultrasonic control cabinet and the intelligent constant potential rectifier, and is used to remotely monitor the ultrasonic operating parameters, cathodic protection potential parameters and equipment operating status.

[0016] Optionally, the control module operates according to a preset collaborative control strategy, which includes: activating the intelligent constant potential rectifier for cathodic protection during a first time period, activating the submersible ultrasonic transducer for ultrasonic descaling during a second time period, or simultaneously activating the intelligent constant potential rectifier and the submersible ultrasonic transducer for collaborative operation during a third time period.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time: 1. Functional integration and compact structure: This invention integrates the ultrasonic descaling system and the cathodic protection corrosion prevention system into one unit, sharing a control cabinet and control system, which reduces the number of equipment and space occupation, and lowers system complexity and investment costs; 2. Synergistic effect and excellent overall performance: Through intelligent synergistic control strategy, ultrasonic descaling and cathodic protection can be performed alternately or simultaneously. Ultrasonic descaling can promptly remove scale and biofilm from the surface of the cooler, preventing scale from shielding the cathodic protection current and ensuring the effectiveness of cathodic protection; cathodic protection, on the other hand, fundamentally inhibits metal corrosion. The two work together to achieve a synergistic effect of "1+1>2". 3. High level of intelligence: It adopts a PLC controller to realize the linkage control of ultrasonic parameters and cathodic protection parameters. The reference electrode provides real-time feedback potential signal to form a closed-loop regulation. It can automatically adjust the working mode according to water quality changes and working conditions without manual intervention. 4. Green and environmentally friendly, requiring no chemical additives and producing no secondary pollution; it is a green anti-corrosion and descaling technology that combines physical and electrochemical processes. 5. Extends equipment lifespan and improves heat exchange efficiency, effectively solving the problems of corrosion thinning and scaling in coolers, significantly extending equipment lifespan, while maintaining high heat exchange efficiency and reducing energy consumption.

[0018] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of the anti-corrosion cleaning device for the tailwater circulating cooler.

[0020] The attached diagram lists the components represented by each number as follows: 1. Multi-channel integrated ultrasonic control cabinet; 2. Intelligent constant potential rectifier; 3. Submersible ultrasonic anti-corrosion cable; 4. Cathodic protection waterproof anti-corrosion cable; 5. MMO titanium-based auxiliary anode; 6. Reference electrode; 7. Submersible ultrasonic transducer; 8. Cooler cathode; 9. River water.

[0021] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0022] The invention will now be described in further detail with reference to the accompanying drawings.

[0023] Please see Figure 1As shown, this embodiment provides a corrosion protection and cleaning device for a tailwater circulating cooler, including: a multi-channel integrated ultrasonic control cabinet 1, an intelligent constant potential rectifier 2, an immersion ultrasonic transducer 7, and a cathodic protection waterproof and corrosion-resistant cable 4. The multi-channel integrated ultrasonic control cabinet 1 has an ultrasonic drive module and a control module built in. The intelligent constant potential rectifier 2 is electrically connected to the multi-channel integrated ultrasonic control cabinet 1, and is also electrically connected to the MMO titanium-based auxiliary anode 5 and the reference electrode 6 respectively. The submersible ultrasonic transducer 7 is electrically connected to the multi-channel integrated ultrasonic control cabinet 1 via the submersible ultrasonic corrosion-resistant cable 3. MMO titanium-based auxiliary anode 5 and reference electrode 6 are electrically connected to intelligent constant potential rectifier 2 via cathode-protected waterproof and corrosion-resistant cable 4, respectively. The submersible ultrasonic transducer 7 and the MMO titanium-based auxiliary anode 5 are installed in the river water 9 where the cooler cathode 8 of the tailwater circulating cooler is located, and the reference electrode 6 is installed in the water near the cooler cathode 8. The multi-channel integrated ultrasonic control cabinet 1 sends ultrasonic drive signals to the submersible ultrasonic transducer 7 through the submersible ultrasonic anti-corrosion cable 3. The intelligent constant potential rectifier 2 outputs cathodic protection current to the cooler cathode 8 through the cathodic protection waterproof and anti-corrosion cable 4 and the MMO titanium-based auxiliary anode 5. The reference electrode 6 collects the potential signal of the cooler cathode 8 and feeds it back to the intelligent constant potential rectifier 2.

[0024] Example 1:

[0025] like Figure 1 As shown, the anti-corrosion cleaning device for a tailwater circulating cooler in this embodiment includes a multi-channel integrated ultrasonic control cabinet 1, an intelligent constant potential rectifier 2, an immersion ultrasonic anti-corrosion cable 3, a cathodic protection waterproof anti-corrosion cable 4, an MMO titanium-based auxiliary anode 5, a reference electrode 6, and an immersion ultrasonic transducer 7.

[0026] During installation, the cooler cathode 8 is completely submerged in river water 9. Multiple MMO titanium-based auxiliary anodes 5 are evenly distributed in the water surrounding the cooler cathode 8, with a spacing of 1-3 meters between adjacent auxiliary anodes to ensure uniform cathodic protection current distribution. The reference electrode 6 is placed in the water near the surface of the cooler cathode 8 to collect the potential signal of the cooler cathode 8 in real time. Submersible ultrasonic transducers 7 are fixedly installed on the surface of the cooler cathode 8 using stainless steel clamps or special brackets. 2-8 transducers are arranged on each cooler tube bundle surface, depending on the length and area of ​​the tube bundle.

[0027] The multi-channel integrated ultrasonic control cabinet 1 and the intelligent constant potential rectifier 2 are located in the control room on the riverbank. The two are connected by a signal cable. The submersible ultrasonic anti-corrosion cable 3 is led out from the control cabinet and laid along the riverbank to the transducer in the water. The cable adopts a double-insulation and metal shielding structure, which has water-resistant and corrosion-resistant properties. The cathodic protection waterproof and anti-corrosion cable 4 is led out from the rectifier and connected to each MMO titanium-based auxiliary anode 5 and reference electrode 6 respectively. The cable joints are treated with waterproof sealant.

[0028] Example 2:

[0029] In this embodiment, the ultrasonic generator built into the multi-channel integrated ultrasonic control cabinet 1 generates a high-frequency electrical signal with a frequency of 20kHz-40kHz. After being amplified to 100W-1000W by the power amplification module, it is transmitted to the immersion ultrasonic transducer 7 through the impedance matching network. The impedance matching network matches the output impedance with the resonant impedance of the transducer, so that the transducer works in the optimal resonant state and the electroacoustic conversion efficiency is not less than 85%.

[0030] The submersible ultrasonic transducer 7 converts electrical signals into high-frequency mechanical vibrations and emits ultrasonic waves onto the surface of the cooler cathode 8. When the ultrasonic waves propagate in the water, they generate a cavitation effect—the high-frequency sound pressure causes a large number of microbubbles to form in the water. When the bubbles collapse, they generate high temperature, high pressure and strong shock waves, which effectively break and peel off the scale and biofilm attached to the metal surface. At the same time, the mechanical vibration of the ultrasonic waves also helps to loosen the scale layer and promote its shedding.

[0031] The control module can automatically adjust the ultrasonic operating frequency, power, and operating time based on the cooler's operating time and water quality monitoring data. For example, during the summer when river water temperature is high and microbial reproduction is rapid, the ultrasonic operating frequency and frequency can be appropriately increased; in winter, the operating intensity can be reduced to achieve energy-saving operation.

[0032] Example 3:

[0033] In this embodiment, the intelligent constant potential rectifier 2 converts 380V AC power into adjustable DC power, and applies a protective current to the cooler cathode 8 in the river water 9 through the MMO titanium-based auxiliary anode 5. The MMO titanium-based auxiliary anode is a titanium-based anode with a mixed metal oxide coating, which has the characteristics of low oxygen evolution potential, low consumption rate and long service life, and is designed to have a service life of not less than 20 years in river water.

[0034] The reference electrode 6 employs a high-stability silver / silver chloride reference electrode or a saturated calomel electrode to continuously monitor the potential of the cooler cathode 8 relative to the reference electrode. The negative feedback closed-loop control circuit built into the constant potential control module compares the measured potential with a preset protection potential threshold (typically -0.85V to 1.05V, relative to the copper / copper sulfate reference electrode), automatically adjusting the rectifier's output current and output voltage to ensure that the potential of the cooler cathode 8 is always maintained within the protection potential range.

[0035] When scale or biofilm forms on the surface of the cooler, the resistance of the scale layer increases, leading to uneven distribution of cathodic protection current and insufficient local protection potential. At this time, the control system can automatically start the ultrasonic descaling program to remove the surface scale layer and restore the uniformity of cathodic protection.

[0036] Example 4:

[0037] In this embodiment, the control module operates according to a preset collaborative control strategy, specifically including the following operating modes: Mode 1 (Alternating Working Mode): During the first time period (e.g., 0:00-6:00 daily), the intelligent constant potential rectifier 2 is activated alone for cathodic protection, while the submersible ultrasonic transducer 7 is in standby mode. During the second time period (e.g., 6:00-6:30 daily), the submersible ultrasonic transducer 7 is activated alone for ultrasonic descaling, and the intelligent constant potential rectifier 2 reduces its output current to a maintenance state. The alternation cycle can be adjusted according to the actual scaling and corrosion rates of the cooler. A typical cycle is ultrasonic descaling 1-2 times per day, each time for 15-30 minutes.

[0038] Mode Two (Collaborative Working Mode): When scaling on the surface of the cooler cathode 8 is severe, the intelligent constant potential rectifier 2 and the submersible ultrasonic transducer 7 are activated simultaneously during the third time period. In this mode, the cavitation effect and mechanical vibration of the ultrasound not only remove the scale layer but also promote the removal of dissolved oxygen from the water, thus enhancing the cathodic protection effect. Simultaneously, the alkaline environment generated by cathodic protection helps soften the scale layer, making ultrasonic descaling easier. The synergistic operation of both modes achieves the best combined effect of corrosion prevention and descaling.

[0039] Mode 3 (Intelligent Adaptive Mode): Based on parameters such as the rate of change of the potential signal fed back from the reference electrode 6 and the change of the load impedance of the ultrasonic transducer, the control module automatically judges the degree of scaling and corrosion on the surface of the cooler, and dynamically adjusts the working parameters and modes of the ultrasonic and cathodic protection. For example, when the cathodic protection potential is detected to be continuously deviating from the set value and the adjustment output still cannot restore it, it is determined that the scale layer is too thick, causing current shielding, and the ultrasonic descaling program is automatically started; after the descaling is completed, it automatically returns to the cathodic protection priority mode.

[0040] Example 5:

[0041] In this embodiment, the device also includes a remote monitoring module. The remote monitoring module establishes a communication connection with the multi-channel integrated ultrasonic control cabinet 1 and the intelligent constant potential rectifier 2 via an industrial Ethernet or 4G / 5G wireless communication network.

[0042] The remote monitoring module has the following functions: (1) Real-time monitoring function: Remotely display the ultrasonic working frequency, power, operating status, and parameters such as output current, output voltage, and protection potential of cathodic protection; (2) Data recording and storage function: The above operating parameters are continuously recorded and stored to form a historical database, which facilitates fault tracing and operation analysis; (3) Alarm function: When the ultrasonic system or cathodic protection system malfunctions (such as transducer failure, potential exceeding the standard, cable breakage, etc.), it will automatically issue an audible and visual alarm signal and push it to the mobile terminal of the management personnel. (4) Remote control function: Managers can manually switch working modes and adjust working parameters through the remote monitoring interface to achieve unattended intelligent management.

[0043] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A corrosion-resistant cleaning device for a tailwater circulating cooler, characterized in that, include: A multi-channel integrated ultrasonic control cabinet (1) is provided, which has an ultrasonic drive module and a control module built in. Intelligent constant potential rectifier (2), which is electrically connected to the multi-channel integrated ultrasonic control cabinet (1) and electrically connected to the MMO titanium-based auxiliary anode (5) and the reference electrode (6) respectively; An immersion ultrasonic transducer (7) is electrically connected to the multi-channel integrated ultrasonic control cabinet (1) via an immersion ultrasonic corrosion-resistant cable (3). The cathodic protection waterproof and corrosion-resistant cable (4) is provided, and the MMO titanium-based auxiliary anode (5) and the reference electrode (6) are electrically connected to the intelligent constant potential rectifier (2) through the cathodic protection waterproof and corrosion-resistant cable (4); The submersible ultrasonic transducer (7) and the MMO titanium-based auxiliary anode (5) are located in the river water (9) where the cooler cathode (8) of the tailwater circulating cooler is located, and the reference electrode (6) is located in the water body near the cooler cathode (8). The multi-channel integrated ultrasonic control cabinet (1) sends ultrasonic drive signals to the submersible ultrasonic transducer (7) through the submersible ultrasonic anti-corrosion cable (3). The intelligent constant potential rectifier (2) outputs cathodic protection current to the cooler cathode (8) through the cathodic protection waterproof anti-corrosion cable (4) and the MMO titanium-based auxiliary anode (5). The reference electrode (6) collects the potential signal of the cooler cathode (8) and feeds it back to the intelligent constant potential rectifier (2).

2. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 1, characterized in that, The multi-channel integrated ultrasonic control cabinet (1) includes: An ultrasonic generator is used to generate high-frequency ultrasonic electrical signals. A power amplifier module, electrically connected to the ultrasonic generator, is used to amplify the power of the ultrasonic electrical signal; An impedance matching network, electrically connected to the power amplification module, is used to match the impedance of the submersible ultrasonic transducer (7); The control module is a PLC controller, which is communicatively connected to the ultrasonic generator, the power amplifier module and the intelligent constant potential rectifier (2), and is used to control the ultrasonic output parameters and work in coordination with the intelligent constant potential rectifier (2).

3. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 2, characterized in that, The intelligent constant potential rectifier (2) includes: A rectifier module is used to convert alternating current (AC) to direct current (DC). The constant potential control module is electrically connected to the rectifier module and has a built-in negative feedback closed-loop control circuit for automatically adjusting the output current and output voltage according to the potential signal fed back by the reference electrode (6). The output terminals are electrically connected to the MMO titanium-based auxiliary anode (5) and the cooler cathode (8), respectively; The input terminal of the reference electrode (6) is electrically connected to the reference electrode terminal of the constant potential control module.

4. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 3, characterized in that, The MMO titanium-based auxiliary anode (5) is an MMO-coated titanium-based auxiliary anode, which is placed in the river water (9) around the cathode (8) of the cooler, and serves as the anode of the cathodic protection system.

5. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 4, characterized in that, The submersible ultrasonic transducer (7) is disposed on the surface of the cooler cathode (8) or in the river water (9) adjacent to the cooler cathode (8) to emit ultrasonic waves to the surface of the cooler cathode (8) to remove scale and microbial film adhering to the surface of the cooler cathode (8).

6. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 5, characterized in that, The immersed ultrasonic anti-corrosion cable (3) is a water-resistant and corrosion-resistant shielded cable, and the cathodic protection waterproof anti-corrosion cable (4) is a water-resistant and corrosion-resistant waterproof cable.

7. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 6, characterized in that, The multi-channel integrated ultrasonic control cabinet (1) has multiple output channels, and each output channel is connected to one or more of the submersible ultrasonic transducers (7) through an independent submersible ultrasonic anti-corrosion cable (3).

8. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 7, characterized in that, The intelligent constant potential rectifier (2) has multiple output circuits, and each output circuit is connected to a set of MMO titanium-based auxiliary anodes (5) and reference electrodes (6) through an independent cathodic protection waterproof and corrosion-resistant cable (4).

9. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 8, characterized in that, It also includes a remote monitoring module, which is communicatively connected to the multi-channel integrated ultrasonic control cabinet (1) and the intelligent constant potential rectifier (2) for remotely monitoring ultrasonic working parameters, cathodic protection potential parameters and equipment operating status.

10. The anti-corrosion cleaning device for a tailwater circulating cooler according to claim 9, characterized in that, The control module operates according to a preset collaborative control strategy, which includes: starting the intelligent constant potential rectifier (2) for cathodic protection during the first time period, starting the submersible ultrasonic transducer (7) for ultrasonic descaling during the second time period, or simultaneously starting the intelligent constant potential rectifier (2) and the submersible ultrasonic transducer (7) for collaborative operation during the third time period.

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