Chemical cleaning system and cleaning method for condenser of thermal power plant

Abstract

The invention discloses a thermal power plant condenser chemical cleaning system and method, and belongs to the technical field of thermal power plant condenser chemical cleaning. The chemical cleaning system comprises a condenser, a chemical cleaning solution tank and an ultrasonic generator, upper and lower water chamber manholes of the condenser are respectively connected with a water return port and a water outlet of the chemical cleaning solution pool; the ultrasonic generator is installed at a circulating water inlet and outlet of the condenser, and an exhaust port of a rear water chamber of the condenser is connected with a steam inlet of the chemical cleaning solution pool. According to the cleaning method, resources consumed by cleaning are reduced through optimization and improvement, and the cleaning effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical cleaning of condensers in thermal power plants, and in particular relates to a chemical cleaning system and a cleaning method for condensers in thermal power plants. Background Art

[0002] As a key component in the thermal cycle of a thermal power plant, the performance of the condenser is directly related to the efficiency and stability of the entire power generation system. During long-term operation, various dirt will inevitably accumulate on the water side of the condenser. These dirt may include sediments, microbial slime, corrosion products, and insoluble salts. The accumulation of dirt will not only reduce the vacuum degree of the condenser, increase the end difference, and cause a significant decrease in heat exchange efficiency, thereby affecting the load capacity and overall operating economy of the unit, but also increase the energy consumption of the unit due to additional thermal resistance, shorten the equipment life, and have an adverse impact on the long-term operation of the power plant.

[0003] The traditional treatment strategy for condenser scaling is to perform manual cleaning or use specific cleaning technology during unit shutdown. However, this approach has obvious limitations, such as long cleaning cycles and failure to respond to performance degradation caused by scaling in a timely manner, which in turn affects the continuous and stable operation of the unit.

[0004] The existing main cleaning technologies have their own advantages and disadvantages. For example, high-pressure water jet cleaning uses high-pressure water flow to flush the inner wall of the condenser tube bundle, which can effectively remove some loosely attached dirt. However, its effect is limited in the face of tightly attached or hardened scale, and the high-pressure water flow may not be able to fully reach the bends or narrow inner diameters of the pipes, but instead cause secondary blockage due to the impact force. In addition, the high-pressure water jet cleaning process consumes a lot of water resources, which imposes a certain burden on the environment. Condenser rubber ball cleaning, which is an online cleaning method, is to put special rubber balls into the circulating water of the condenser, and use the water flow to drive the rubber balls to roll on the inner wall of the tube to scrape off soft scale. However, for hard scale or stubborn scale, the effect of rubber ball cleaning is not good. In addition, the rubber ball recovery system is often not perfect, and the ball collection rate is difficult to guarantee. The low ball collection rate not only affects the cleaning efficiency, but may also cause the rubber balls to accumulate locally in the condenser, affecting the normal circulating water flow. Chemical cleaning uses specific chemical cleaning agents to remove the dirt in the condenser by soaking or circulating cleaning, especially for hard scale. However, the chemical cleaning process is time-consuming, and even if corrosion inhibitors are added, the condenser heat exchange tubes that are exposed to chemical media for a long time may still be at risk of secondary corrosion, affecting the safety and service life of the equipment. In addition, the treatment of chemical waste liquid is also a major challenge, and environmental protection regulations must be strictly followed to avoid pollution to the environment.

[0005] In summary, although the existing condenser cleaning technologies have their own advantages, they also have obvious limitations. Therefore, developing more efficient and environmentally friendly cleaning technologies, or comprehensively applying multiple cleaning methods to achieve effective control of condenser fouling, is an important issue currently facing thermal power plants. Summary of the invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a chemical cleaning system and a cleaning method for a condenser in a thermal power plant, wherein the cleaning method is optimized and improved to reduce the resources consumed in cleaning and improve the cleaning effect.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a chemical cleaning system for a condenser in a thermal power plant, comprising a condenser, a chemical cleaning solution tank, and an ultrasonic generator; The upper and lower water chamber manholes of the condenser are respectively connected to the return water port and the water outlet of the chemical cleaning solution pool; the ultrasonic generator is installed at the circulating water inlet and outlet of the condenser, and the rear water chamber exhaust port of the condenser is connected to the steam inlet of the chemical cleaning solution pool.

[0008] In one embodiment, the upper water chamber manhole of the condenser is connected to the return port of the chemical cleaning solution tank through a chemical cleaning main return pipe.

[0009] In one embodiment, the lower water chamber manhole of the condenser is connected to the water outlet of the chemical cleaning solution tank through a chemical cleaning main water inlet pipe.

[0010] In one embodiment, a cleaning pump is provided on the main water inlet pipe of the chemical cleaning.

[0011] In one embodiment, circulating water inlet and outlet blocking plates are provided at the circulating water inlet and outlet of the condenser.

[0012] In one embodiment, the ultrasonic generator is installed on the circulating water inlet and outlet blocking plates.

[0013] In one embodiment, the exhaust port of the rear water chamber of the condenser is connected to the steam inlet of the chemical cleaning solution tank through a rear water chamber exhaust pipe.

[0014] In one embodiment, the outlet end of the rear water chamber exhaust pipe extends into the interior of the chemical cleaning solution tank.

[0015] The present invention also provides a method for chemically cleaning a condenser in a thermal power plant, based on the above-mentioned chemical cleaning system for a condenser in a thermal power plant, comprising the following steps: The chemical cleaning solution in the chemical cleaning solution pool is injected into the condenser for circulation cleaning, and the ultrasonic generator is turned on for ultrasonic cleaning during the circulation cleaning.

[0016] In one embodiment, the chemical cleaning solution is 3%-10% aminosulfonic acid, 0.2%-0.5% corrosion inhibitor, an appropriate amount of defoaming agent, and the rest is desalted water, measured in mass percentage; the operating frequency of the ultrasonic generator is between 200kHz-500kHz, the output power control range is 2kW-5kW, the working time is 120min, and it works every 2h; the pH value of the chemical cleaning solution in the chemical cleaning solution pool 2 is always 4±0.5.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a chemical cleaning system for condensers in thermal power plants. The chemical cleaning system can effectively clean the condenser heat exchange tubes without affecting the normal power generation of the unit, reduce the end difference, improve the heat exchange efficiency, and make the unit run smoothly. Compared with the original chemical cleaning method, due to the ultrasonic vibration of the ultrasonic generator, the energy of the ultrasonic wave can make the chemical cleaning liquid in the heat exchange tube collide with the tube wall, and the hard scale is easy to peel off from the tube wall, so that the cleaning time is shortened and the secondary corrosion of the condenser heat exchange pipe caused by long-term chemical cleaning is weakened. In addition, the exhaust port of the rear water chamber is extended to the chemical cleaning solution pool, which is conducive to the full mixing of solid medicines and desalted water during the dosing process, and prevents the solid medicine from sinking to the bottom. In addition, the system recovers quickly after cleaning and is simple to operate, which not only improves the cleaning effect and efficiency, but also greatly reduces the resources consumed by cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the power plant condenser chemical cleaning system of the present invention; Among them: 1- condenser; 2- chemical cleaning solution tank; 3- cleaning pump; 4- chemical cleaning main water inlet pipe; 5- chemical cleaning main return water pipe; 6- ultrasonic generator; 7- manhole; 8- rear water chamber exhaust pipe; 9- circulating water inlet and outlet plugging plate. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 The present invention provides a chemical cleaning system for a condenser in a thermal power plant, the innovation of which lies in the integration of a condenser 1, a chemical cleaning solution tank 2 and an ultrasonic generator 6 to form an efficient and environmentally friendly cleaning process.

[0022] The above system mainly comprises a condenser 1 , a chemical cleaning solution tank 2 and an ultrasonic generator 6 .

[0023] Among them, the condenser 1: as an important equipment in the thermal power plant, its upper and lower water chamber manholes are respectively connected to the return water inlet and the outlet of the chemical cleaning solution pool 2. This allows the cleaning solution to circulate inside the condenser, effectively covering and cleaning the inner wall of the heat exchange tube.

[0024] Among them, the chemical cleaning solution tank 2 is used to store and prepare the chemical cleaning solution, which contains aminosulfonic acid, desalted water, defoamer, corrosion inhibitor and other ingredients to achieve efficient cleaning of the dirt inside the condenser. In addition, the chemical cleaning solution tank 2 also takes into account the full mixing of solid medicines and desalted water during the dosing process, and the design of extending the exhaust port of the rear water chamber into the chemical cleaning solution tank 2 effectively avoids the problem of solid medicine deposition.

[0025] Among them, the ultrasonic generator 6 is installed at the circulating water inlet and outlet of the condenser 1, and uses the energy of ultrasonic waves to make the chemical cleaning liquid collide with the pipe wall at high frequency during the flow process, thereby accelerating the peeling of hard scale from the pipe wall. This combination of physical cleaning and chemical cleaning greatly improves the cleaning efficiency and effect.

[0026] The above system has the advantage of efficient cleaning. The introduction of ultrasonic waves allows the chemical cleaning solution to penetrate deeper into the heat exchange tube, effectively remove stubborn dirt, reduce end difference, and improve heat exchange efficiency. The above system can also reduce corrosion. Compared with traditional chemical cleaning methods, ultrasonic cleaning can shorten the cleaning time, thereby reducing the risk of secondary corrosion that may be caused by long-term immersion in chemical solutions. In addition, the above system can also save resources. The system recovers quickly and is easy to operate. It not only improves the cleaning efficiency, but also reduces the consumption of water resources and other chemicals required during the cleaning process. And the above system can fully mix. Specifically, the design of the exhaust port of the rear water chamber extending to the chemical cleaning solution pool 2 ensures the full mixing of solid medicines and desalted water, avoiding the waste and deposition of solid medicines.

[0027] In summary, the thermal power plant condenser chemical cleaning system proposed by the present invention realizes efficient and environmentally friendly cleaning of the heat exchange tubes of the condenser 1 by integrating ultrasonic cleaning technology and chemical cleaning solution. The system not only improves the cleaning effect and efficiency, but also reduces resource consumption and environmental pollution, providing a strong guarantee for the long-term stable operation of the thermal power plant.

[0028] In another aspect, the present invention provides a method for chemically cleaning a condenser in a thermal power plant, comprising the following steps: The chemical cleaning solution in the chemical cleaning solution pool 2 is injected into the condenser 1 for circulation cleaning, and the ultrasonic generator 6 is turned on for ultrasonic cleaning during the circulation cleaning.

[0029] The chemical cleaning solution pool 2 uses aminosulfonic acid and deionized water as the main cleaning medium; more specifically, the chemical cleaning solution is 3%-10% aminosulfonic acid, 0.2%-0.5% corrosion inhibitor, an appropriate amount of defoamer, and the rest is deionized water. The operating frequency of the ultrasonic generator 6 is between 200kHz-500kHz, the output power control range is 2kW-5kW, the working time is 120 minutes, and it works every 2 hours; the pH value of the chemical cleaning solution in the chemical cleaning solution pool 2 is always 4±0.5.

[0030] In one embodiment, a chemical cleaning system for a condenser in a thermal power plant is provided, comprising a condenser 1, a chemical cleaning solution tank 2, a cleaning pump 3, a chemical cleaning main water inlet pipe 4, a chemical cleaning main water return pipe 5, a rear water chamber exhaust pipe 8, an ultrasonic generator 6, and a circulating water inlet and outlet plugging plate 9.

[0031] The chemical cleaning solution pool 2 uses aminosulfonic acid and deionized water as main cleaning media. Specifically, the solution in the chemical cleaning solution pool 2 is composed of aminosulfonic acid, deionized water, defoamer, corrosion inhibitor, and the like.

[0032] One end of the main chemical cleaning water inlet pipe 4 is connected to the manhole 7 of the lower water chamber of the condenser 1, and the other end is connected to the water outlet of the chemical cleaning solution tank 2. One end of the main chemical cleaning water return pipe 5 is connected to the manhole 7 of the upper water chamber of the condenser 1, and the other end is connected to the water return port of the chemical cleaning solution tank 2. The cleaning pump 3 is arranged on the main chemical cleaning water inlet pipe 4.

[0033] One end of the rear water chamber exhaust pipe 8 is connected to the rear water chamber exhaust port of the condenser 1, and the other end is connected to the steam inlet of the chemical cleaning solution pool 2 and extends into the chemical cleaning solution pool 2, for exhausting the gas generated by the reaction and further mixing the cleaning solution.

[0034] Among them, the circulating water inlet and outlet plugging plates 9 are arranged at the circulating water inlet and outlet of the condenser 1, and the circulating water inlet and outlet plugging plates 9 are installed at the circulating water inlet and outlet of the condenser 1 to prevent system leakage.

[0035] The ultrasonic generator 6 is installed on the circulating water inlet and outlet plugging plates 9 on the condenser 1 .

[0036] The operating steps of the above-mentioned thermal power plant condenser chemical cleaning system are as follows: Install plugging plates: Install circulating water inlet and outlet plugging plates 9 at the circulating water inlet and outlet of the condenser 1 to prevent system leakage.

[0037] Connect the water inlet pipe: remove the manhole cover of the lower water chamber of the condenser 1, connect one end of the chemical cleaning main water inlet pipe 4 to the manhole 7 of the lower water chamber of the condenser 1, and connect the other end to the water outlet of the chemical cleaning solution pool 2.

[0038] Connect the return water pipe: remove the manhole cover of the upper water chamber of the condenser 1, connect one end of the chemical cleaning main return water pipe 5 to the manhole 7 of the upper water chamber of the condenser 1, and connect the other end to the return water port of the chemical cleaning solution tank 2.

[0039] Connecting the exhaust pipe: One end of the rear water chamber exhaust pipe 8 is connected to the rear water chamber exhaust port of the condenser 1 , and the other end extends to the chemical cleaning solution pool 2 .

[0040] Install the ultrasonic generator: The ultrasonic generator 6 is installed on the circulating water inlet and outlet plugging plate 9 on the condenser 1.

[0041] Inject water to check for leaks: Before chemical cleaning, inject deionized water into the steam side of condenser 1 to check for leaks and ensure the sealing of the system.

[0042] Prepare the cleaning solution: inject a proper amount of desalted water into the chemical cleaning solution pool 2, and then inject a proper amount of corrosion inhibitor, aminosulfonic acid and defoaming agent into the desalted water and mix them evenly.

[0043] Start cleaning: Start the cleaning pump 3, and inject the prepared cleaning liquid into the condenser 1 from the chemical cleaning main water inlet pipe 4 to start circulating cleaning.

[0044] Monitoring and adjustment: After the start of the circulation cleaning, measure the pH value of the solution every 30 minutes and add the reagent in time to maintain the pH value of the cleaning solution at about 4. The total cleaning time is planned to be 5 hours. If the pH value of the solution still changes after 5 hours of cleaning, continue to add reagents for cleaning until the pH value stabilizes at 4 for 1 hour. It is determined that the scale in condenser 1 is cleaned and the chemical cleaning process is completed.

[0045] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0046] Example 1 This embodiment introduces in detail the application of a thermal power plant condenser chemical cleaning system on a condenser of a 300MW thermal power unit. The system mainly consists of a condenser 1, a chemical cleaning solution tank 2, a cleaning pump 3, a chemical cleaning main water inlet pipe 4, a chemical cleaning main water return pipe 5, a rear water chamber exhaust pipe 8, an ultrasonic generator 6, and a circulating water inlet and outlet plugging plate 9.

[0047] Before the cleaning operation begins, a circulating water inlet and outlet plug 9 is first installed at the circulating water inlet and outlet of the condenser 1 to ensure that the system will not leak during the cleaning process. Subsequently, the manhole cover of the lower water chamber of the condenser 1 is removed, and one end of the chemical cleaning main water inlet pipe 4 is connected to the manhole 7 of the lower water chamber of the condenser, and the other end is connected to the chemical cleaning solution tank 2. Similarly, the manhole cover of the upper water chamber of the condenser 1 is removed, and one end of the chemical cleaning main return water pipe 5 is connected to the manhole 7 of the upper water chamber of the condenser 1, and the other end is connected to the chemical cleaning solution tank 2. In addition, one end of the rear water chamber exhaust pipe 8 is connected to the rear water chamber exhaust port of the condenser 1, and the other end extends into the chemical cleaning solution tank 2. The ultrasonic generator 6 is installed on the circulating water inlet and outlet plug 9 of the condenser 1.

[0048] Prior to chemical cleaning, demineralized water was injected into the steam side of condenser 1 for leak detection.

[0049] At the beginning of cleaning, an appropriate amount of desalted water is injected into the chemical cleaning solution pool 2, and an appropriate amount of corrosion inhibitor, aminosulfonic acid and defoaming agent are added, and the cleaning solution is formed after being evenly mixed. Then, the cleaning pump 3 is started, and the prepared cleaning solution is injected into the condenser 1 through the chemical cleaning main water inlet pipe 4 to start the circulation cleaning. The operating frequency of the ultrasonic generator 6 is 200kHz, the output power control range is 2kW, the working time is 120min, and it works every 2h; during the circulation cleaning process, the pH value of the cleaning solution is measured every 30 minutes, and the agent is replenished in time as needed to maintain the pH value of the cleaning solution within the range of 4±0.5.

[0050] Example 2 This embodiment introduces in detail the application of a thermal power plant condenser chemical cleaning system on a 600MW thermal power unit condenser. The system mainly consists of a condenser 1, a chemical cleaning solution tank 2, a cleaning pump 3, a chemical cleaning main water inlet pipe 4, a chemical cleaning main water return pipe 5, a back water chamber exhaust pipe 8, an ultrasonic generator 6, and a circulating water inlet and outlet plugging plate 9.

[0051] Before the cleaning operation begins, a circulating water inlet and outlet plug 9 is first installed at the circulating water inlet and outlet of the condenser 1 to ensure that the system will not leak during the cleaning process. Subsequently, the manhole cover of the lower water chamber of the condenser 1 is removed, and one end of the chemical cleaning main water inlet pipe 4 is connected to the manhole 7 of the lower water chamber of the condenser, and the other end is connected to the chemical cleaning solution tank 2. Similarly, the manhole cover of the upper water chamber of the condenser 1 is removed, and one end of the chemical cleaning main return water pipe 5 is connected to the manhole 7 of the upper water chamber of the condenser 1, and the other end is connected to the chemical cleaning solution tank 2. In addition, one end of the rear water chamber exhaust pipe 8 is connected to the rear water chamber exhaust port of the condenser 1, and the other end extends into the chemical cleaning solution tank 2. The ultrasonic generator 6 is installed on the circulating water inlet and outlet plug 9 of the condenser 1.

[0052] Prior to chemical cleaning, demineralized water was injected into the steam side of condenser 1 for leak detection.

[0053] At the beginning of cleaning, an appropriate amount of desalted water is injected into the chemical cleaning solution pool 2, and an appropriate amount of corrosion inhibitor, aminosulfonic acid and defoaming agent are added, and the cleaning solution is formed after being evenly mixed. Then, the cleaning pump 3 is started, and the prepared cleaning solution is injected into the condenser 1 through the chemical cleaning main water inlet pipe 4 to start the circulation cleaning. The operating frequency of the ultrasonic generator 6 is between 500kHz, the output power control range is 5kW, the working time is 120min, and it works every 2h; during the circulation cleaning process, the pH value of the cleaning solution is measured every 30 minutes, and the agent is replenished in time as needed to maintain the pH value of the cleaning solution within the range of 4±0.5.

[0054] The above two embodiments both demonstrate the effective application of the thermal power plant condenser chemical cleaning system on condensers of thermal power units of different capacities, proving its reliability and high efficiency in actual operation.

[0055] Comparative Example 1 This comparative example is substantially the same as Example 1, except that the ultrasonic generator 6 is not added in this comparative example.

[0056] Comparative Example 2 This comparative example is substantially the same as Example 2, except that the ultrasonic generator 6 is not added in this comparative example.

[0057] Comparative Example 3 Compared with Example 1, the rear water chamber exhaust pipe 8 and the ultrasonic generator 6 are removed in this comparative example.

[0058] Comparative Example 4 Compared with Example 2, this comparative example removes the rear water chamber exhaust pipe 8 and the ultrasonic generator 6.

[0059] The cleaning results are as follows:

[0060] In summary, the present invention uses a condenser chemical cleaning system designed for thermal power plants, which includes: a condenser 1, a chemical cleaning solution tank 2, a cleaning pump 3, a chemical cleaning main water inlet pipe 4, a chemical cleaning main water return pipe 5, a rear water chamber exhaust pipe 8 and an ultrasonic generator 6. This system can efficiently clean the heat exchange tubes of the condenser 1 while ensuring that the unit continues to generate power normally, thereby reducing the end difference, improving the heat exchange efficiency, and ensuring the stable operation of the unit. Compared with traditional chemical cleaning methods, this system relies on the ultrasonic vibration energy released by the ultrasonic generator 6 to cause the chemical cleaning liquid to strongly collide with the tube wall in the heat exchange tube, making it easy to peel off the stubborn scale from the tube wall, significantly shortening the cleaning cycle, and reducing the risk of secondary corrosion to the condenser heat exchange pipe caused by long-term chemical immersion.

[0061] Furthermore, the system is connected to the exhaust port of the rear water chamber of the condenser 1 through the rear water chamber exhaust pipe 8, and the other end extends to the chemical cleaning solution pool 2. This layout is conducive to ensuring that the solid medicine and the desalted water are fully mixed and evenly mixed when adding solid medicines, and effectively prevents the solid medicines from being deposited in the solution pool. In addition, after the cleaning operation is completed, the system recovers quickly and the operation process is simple, which not only greatly improves the effect and efficiency of the cleaning operation, but also significantly reduces the consumption of resources required in the cleaning process, achieving the dual optimization of the economy and environmental protection of the cleaning process.

[0062] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A chemical cleaning system for condensers in thermal power plants, characterized in that: It comprises a condenser (1), a chemical cleaning solution tank (2), and an ultrasonic generator (6); The upper and lower water chamber manholes of the condenser (1) are respectively connected to the water return port and the water outlet of the chemical cleaning solution pool (2); the ultrasonic generator (6) is installed at the circulating water inlet and outlet of the condenser (1), and the rear water chamber exhaust port of the condenser (1) is connected to the steam inlet of the chemical cleaning solution pool (2).

2. The chemical cleaning system for condensers in thermal power plants according to claim 1, characterized in that: The upper water chamber manhole of the condenser (1) is connected to the return water port of the chemical cleaning solution tank (2) via a chemical cleaning main return water pipeline (5).

3. The chemical cleaning system for condensers in thermal power plants according to claim 1, characterized in that: The manhole of the lower water chamber of the condenser (1) is connected to the water outlet of the chemical cleaning solution pool (2) via a chemical cleaning main water inlet pipe (4).

4. The chemical cleaning system for condensers in thermal power plants according to claim 3, characterized in that: The chemical cleaning main water inlet pipe (4) is provided with a cleaning pump (3).

5. The chemical cleaning system for condensers in thermal power plants according to claim 1, characterized in that: A circulating water inlet and outlet blocking plate (9) is provided at the circulating water inlet and outlet of the condenser (1).

6. The chemical cleaning system for condensers in thermal power plants according to claim 5, characterized in that: The ultrasonic generator (6) is mounted on the circulating water inlet and outlet blocking plates (9).

7. The chemical cleaning system for condensers in thermal power plants according to claim 1, characterized in that: The exhaust port of the rear water chamber of the condenser (1) is connected to the steam inlet of the chemical cleaning solution pool (2) through a rear water chamber exhaust pipe (8).

8. The chemical cleaning system for condensers in thermal power plants according to claim 7, characterized in that: The outlet end of the rear water chamber exhaust pipe (8) extends into the interior of the chemical cleaning solution pool (2).

9. A method for chemical cleaning of a condenser in a thermal power plant, characterized in that: The chemical cleaning system for condensers in thermal power plants according to any one of claims 1 to 8 comprises the following steps: The chemical cleaning solution in the chemical cleaning solution pool (2) is injected into the condenser (1) for circulation cleaning. During the circulation cleaning, the ultrasonic generator (6) is turned on for ultrasonic cleaning.

10. The method for chemical cleaning of condensers in thermal power plants according to claim 9, characterized in that: The operating frequency of the ultrasonic generator (6) is between 200kHz and 500kHz, the output power control range is 2kW-5kW, the working time is 120min, and it works once every 2h; the pH value of the chemical cleaning solution in the chemical cleaning solution pool (2) is always 4±0.5.

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