Water cooling wall adherence atmosphere sensing and improving system for targeted prevention and treatment of high-temperature corrosion and application method of water cooling wall adherence atmosphere sensing and improving system

Abstract

The invention relates to a water-cooled wall adherence atmosphere sensing and improving system for targeted prevention and control of high-temperature corrosion and an application method thereof, belongs to the technical field of combustion of thermal power plants, and solves the problem that safe operation of a boiler is threatened due to high-temperature corrosion of a water-cooled wall caused by a low-nitrogen combustion technology of a pulverized coal boiler of a thermal power plant at present. The adherence air nozzle is communicated with one end of a pipeline containing a water-cooling protective cover, and the other end of the pipeline containing the water-cooling protective cover is simultaneously communicated with a reducing gas detection and analysis pipeline and an adherence air supply improved pipeline. The device can accurately sense the adherence atmosphere of the water-cooled wall, detect the content of reducing gas, effectively improve the atmosphere when the content is too high, reduce the high-temperature corrosion risk of the water-cooled wall, guarantee stable operation of the boiler, reasonably control the conditions of all links and improve the overall operation reliability of the system.

Description

Technical Field

[0001] The invention relates to a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion and an application method thereof, belonging to the technical field of combustion in thermal power plants. Background Art

[0002] In recent years, with the continuous improvement of low-nitrogen combustion technology in pulverized coal boilers, the problem of high-temperature corrosion of boiler water-cooled walls has become increasingly prominent. When the water-cooled wall of a pulverized coal boiler has high-temperature corrosion, it is mainly manifested in reduced wall thickness and reduced strength, which is more likely to cause water-cooled wall pipe bursts and leakage problems, seriously affecting the safe operation and management of pulverized coal boilers. According to the results summarized in a large number of known experiments and references, the flue gas components in the wall-adhering area of ​​the boiler furnace water-cooled wall are mainly composed of three gases: CO, H2S, and O2, which play an important role in the high-temperature corrosion process of the water-cooled wall. Under different flue gas conditions, the corrosion rate of the water-cooled wall varies greatly, and there are relatively few relevant standards and specifications for testing and improving the wall-adhering atmosphere in the high-temperature corrosion zone of coal-fired boilers in the current national standards and industry standards.

[0003] How to accurately obtain the reducing gas atmosphere of the water-cooled wall, improve and enhance the working conditions of the water-cooled wall, and reduce the impact of high-temperature corrosion caused by the existing reducing gas is the key to the present invention. Therefore, it is necessary to propose a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion to solve the above problems. Summary of the invention

[0004] The present invention proposes a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion and an application method thereof, which solves the problem that the current pulverized coal boiler in a thermal power plant suffers from high-temperature corrosion of the water-cooled wall due to low-nitrogen combustion technology, threatening the safe operation of the boiler.

[0005] A water-cooled wall atmosphere sensing and improvement system for targeted prevention and treatment of high-temperature corrosion comprises a wall-attached wind nozzle, a pipe containing a water-cooled protective cover, a reducing gas detection and analysis pipeline and a wall-attached wind supply improvement pipeline, wherein the wall-attached wind nozzle is connected to one end of the pipe containing the water-cooled protective cover, and the other end of the pipe containing the water-cooled protective cover is simultaneously connected to the reducing gas detection and analysis pipeline and the wall-attached wind supply improvement pipeline.

[0006] Furthermore, the reducing gas detection and analysis pipeline is sequentially provided with a first check valve, a first electric valve, a first flow meter, a vacuum pump and a reducing gas analyzer, and the check valve is adjacent to the other end of the pipeline containing the water-cooled protective cover.

[0007] Furthermore, the reducing gas analyzer signal is connected to a detection gas dilution device and a flue gas duct, one end of the detection gas dilution device and the flue gas duct are both connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline, the other end of the detection gas dilution device is connected to the outside air, and the other end of the flue gas duct is connected to the flue gas measurement point.

[0008] Furthermore, the detection gas dilution device includes a second electric valve and a second flow meter, one end of the second flow meter is connected to the outside air, and the other end is connected to one end of the second electric valve, the other end of the second electric valve is connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline, the reducing gas analyzer is simultaneously connected to the first electric valve, the second electric valve and the vacuum pump signal, the first flow meter and the second flow meter are both connected to the reducing gas analyzer signal,

[0009] A smoke pump is provided in the smoke pipe, one end of the smoke pump is connected to the smoke measurement point, and the other end is connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline. The reducing gas analyzer is connected to the smoke pump signal.

[0010] Wherein, the second electric valve is used to adjust its opening according to the feedback control signal of the reducing gas analyzer, so as to control the air intake flow rate;

[0011] The second flow meter is used to detect the intake flow rate of air and send the intake flow rate information to the reducing gas analyzer;

[0012] The flue gas pump is used to adjust its opening according to the feedback control signal of the reducing gas analyzer, so as to control the intake flow rate of the flue gas;

[0013] The reducing gas analyzer is used to detect the ratio of the mixed gas formed by air and flue gas. When the ratio of the mixed gas does not meet the preset ratio, the reducing gas analyzer feedback controls the opening of the second electric valve and the flue gas pump to adjust the ratio of the mixed gas to the preset ratio.

[0014] Furthermore, both the first flow meter and the second flow meter have filtering functions.

[0015] Furthermore, the improved wall-attached air supply pipeline is provided with a second check valve and a third electric valve in sequence, the second check valve is adjacent to the other end of the pipeline containing the water-cooled protective cover, one end of the third electric valve is connected to the boiler primary air extraction system, and the other end is connected to the boiler primary air extraction equipment, the reducing gas analyzer is connected to the third electric valve signal,

[0016] The reducing gas analyzer is also used to detect the content of reducing gas in the mixed gas when the mixed gas meets the preset ratio. When the reduced gas content extracted is too high, the first electric valve, the second electric valve and the vacuum pump are controlled to be closed, and the third electric valve in the wall-attached air supply improved pipeline is opened.

[0017] Furthermore, in the water-cooled wall wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, the flue gas measurement point and the wall wind nozzle are arranged between the lower position of the main combustion zone of the power plant pulverized coal furnace and the SOFA wind, and above the corner of the cold ash hopper, for realizing the extraction of gas in the corresponding area and the delivery of wall wind; the water-cooled wall wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion are all located outside the boiler.

[0018] An application method of a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, based on the above-mentioned water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, the application method comprises:

[0019] S100, system installation: The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion is installed at the lower position of the main combustion zone of the power plant pulverized coal furnace and between the SOFA wind, as well as above the corner of the cold ash hopper;

[0020] S200, atmosphere perception:

[0021] S201, turning on the cooling water of the pipeline containing the water-cooled protective cover to ensure that the cooling water return temperature is lower than the operating temperature of the reducing gas analyzer, and at the same time closing the third electric valve in the wall-attached air supply improved pipeline to prevent the measured gas from entering the wall-attached air supply improved pipeline;

[0022] S202, opening the second electric valve in the detection gas dilution device, allowing air to enter the reducing gas detection and analysis pipeline through the second flow meter, and measuring the incoming air flow value;

[0023] S203, slowly open the first electric valve in the reducing gas detection and analysis pipeline, so that the flue gas at the measuring point enters the reducing gas detection and analysis pipeline through the flue gas pump and mixes with the air to form a mixed gas, while ensuring that the ratio of the reducing gas and the dilution air entering meets the test requirements. When the mass flow rate of the mixed gas per unit time is met, the reducing gas analyzer measures the reducing gas;

[0024] S300, reducing gas treatment steps:

[0025] S301. When the reducing gas analyzer detects that the reducing gas content in the mixed gas is lower than the preset value, the reducing gas analyzer controls the third electric valve of the wall-attached air supply improved pipeline to be in a closed state; when the reducing gas content in the mixed gas is detected to be higher than the preset value, first determine that the cooling water flow rate and the cooling water outlet temperature in the cooling water protective cover meet the preset values, then confirm that all the electric valves, flow meters, vacuum pumps, flue gas pumps and reducing gas analyzers in the system meet the opening requirements, and then confirm that the operating temperature of the reducing gas analyzer meets the operating environment requirements;

[0026] S302, the reducing gas analyzer closes the first electric valve, the second electric valve, the vacuum pump and the flue gas pump in the reducing gas detection and analysis pipeline, and stops the reducing gas detection and analysis process;

[0027] S303, open the third electric valve in the wall-attached air supply improvement pipeline, so that the boiler primary air passes through the second check valve, the third electric valve and the pipeline containing the water-cooled protective cover, and is ejected from the wall-attached air nozzle to purge the reducing high-temperature corrosive gas in the installation area and improve the atmosphere near the water-cooled wall;

[0028] S304. After performing the purge for 3 minutes, return to S200.

[0029] A storage medium stores a computer program, which, when executed by a processor, implements an application method of the above-mentioned water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion.

[0030] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the application method of the above-mentioned water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion.

[0031] Beneficial effects of the present invention: The water-cooled wall atmosphere sensing and improvement system and application method thereof for targeted prevention and control of high-temperature corrosion can accurately detect the reducing gas content in the mixed gas by setting a reducing gas detection and analysis pipeline and a wall-adhering wind supply improvement pipeline. When the content is too high, the working state is switched in time, the detection-related valves are closed and the valves of the wall-adhering wind supply improvement pipeline are opened, and the wall-adhering wind is used to purge the high-reducing gas area near the water-cooled wall to improve the atmosphere, thereby effectively reducing the risk of high-temperature corrosion of the water-cooled wall, extending the service life of the water-cooled wall, and ensuring the safe and stable operation of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the installation position of a water-cooled wall atmosphere sensing and improvement system for targeted prevention and treatment of high-temperature corrosion according to the present invention;

[0033] Figure 2 This is a schematic structural diagram of a water-cooled wall atmosphere sensing and improvement system for targeted prevention and treatment of high-temperature corrosion according to the present invention. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely 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 are within the scope of protection of the present invention.

[0035] Reference Figure 2 As shown, a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion includes a wall-attached wind nozzle, a pipe containing a water-cooled protective cover, a reducing gas detection and analysis pipeline, and a wall-attached wind supply improvement pipeline. The wall-attached wind nozzle is connected to one end of the pipe containing the water-cooled protective cover, and the other end of the pipe containing the water-cooled protective cover is simultaneously connected to the reducing gas detection and analysis pipeline and the wall-attached wind supply improvement pipeline.

[0036] Specifically, the present invention constructs a complete and efficient system architecture by connecting the wall-attached wind nozzle, the pipeline containing the water-cooled protective cover, the reducing gas detection and analysis pipeline and the wall-attached wind supply improvement pipeline. Among them, the pipeline containing the water-cooled protective cover plays a key connecting role. On the one hand, it closely connects the wall-attached wind nozzle with other parts of the system, so that the wall-attached wind can be accurately sprayed onto the surface of the water-cooled wall to form a protective atmosphere; on the other hand, it simultaneously connects the reducing gas detection and analysis pipeline and the wall-attached wind supply improvement pipeline, realizing real-time monitoring and dynamic improvement of the wall-attached atmosphere of the water-cooled wall. When the reducing gas detection and analysis pipeline detects that there is too much reducing gas in the wall-attached atmosphere of the water-cooled wall, the system can respond in time, and deliver the wall-attached wind through the wall-attached wind supply improvement pipeline to improve the atmosphere and reduce the concentration of reducing gas, thereby effectively preventing and controlling high-temperature corrosion of the water-cooled wall, extending the service life of the water-cooled wall, and ensuring the safe and stable operation of the boiler.

[0037] Furthermore, the reducing gas detection and analysis pipeline is sequentially provided with a first check valve, a first electric valve, a first flow meter, a vacuum pump and a reducing gas analyzer, and the check valve is adjacent to the other end of the pipeline containing the water-cooled protective cover.

[0038] Specifically, in the reducing gas detection and analysis pipeline, the first check valve can effectively prevent gas backflow, ensure the stability and unidirectionality of gas flow during the detection process, and avoid interference with the detection results due to gas backflow. The first electric valve can accurately control the on and off of the gas according to system requirements to achieve automated operation management. The first flowmeter can accurately measure the gas flow rate, provide reliable data support for the reducing gas analyzer, and help to more accurately analyze the content of reducing gas in the mixed gas. The vacuum pump provides power for the extraction and transportation of the gas, ensuring that the gas extracted from the water-cooled wall area can smoothly enter the reducing gas analyzer for detection. As a core component, the reducing gas analyzer can quickly and accurately detect the reducing gas content in the mixed gas, providing a scientific basis for subsequent atmosphere improvement decisions, thereby achieving effective perception of the water-cooled wall atmosphere and accurate prevention and control of high-temperature corrosion, and ensuring the safe and stable operation of the boiler system.

[0039] Furthermore, the reducing gas analyzer signal is connected to a detection gas dilution device and a flue gas duct, one end of the detection gas dilution device and the flue gas duct are both connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline, the other end of the detection gas dilution device is connected to the outside air, and the other end of the flue gas duct is connected to the flue gas measurement point.

[0040] Specifically, by connecting the detection gas dilution device and the flue gas pipeline at a specific position in the reducing gas detection and analysis pipeline, precise control of the measurement gas is achieved. The detection gas dilution device is connected to the outside air, and can introduce an appropriate amount of air into the pipeline as needed to mix with the flue gas from the flue gas measurement point. On the one hand, such a design can make the mixed gas in a concentration range more suitable for detection by the reducing gas analyzer, thereby improving the accuracy and reliability of the detection. On the other hand, the diluted gas can reduce the potential damage to the detection equipment and extend the service life of the equipment. The flue gas pipeline is connected to the flue gas measurement point to ensure that the flue gas samples in the water-cooled wall area can be accurately obtained, providing a real and effective data basis for subsequent analysis and improvement. The signal connection between the reducing gas analyzer and these components realizes the intelligent control of the entire system, and can adjust the working status of each component in time according to the test results, thereby effectively preventing and controlling high-temperature corrosion of the water-cooled wall and ensuring the stable operation of the boiler system.

[0041] Among them, in the present invention, the detection gas mainly refers to the flue gas, but to be precise, it is the part of the flue gas extracted from a specific measuring point for detecting the reducing gas content. The system extracts the flue gas from the measuring point through the flue gas pipeline, and after being processed by a series of components (such as check valves, electric valves, filters, etc.), it is transported to the reducing gas analyzer for detection and analysis. In this process, in order to ensure the accuracy of the detection, air is extracted through the detection gas dilution device and mixed with the flue gas in a certain proportion before entering the analyzer. Therefore, although the core detection object is the reducing gas component in the flue gas, the detection gas is a mixed gas containing flue gas after certain treatment and preparation (including dilution and other operations). Its ultimate goal is to accurately determine the content of reducing gas in the flue gas to determine whether further measures are needed (such as turning on the wall wind to improve the atmosphere) to prevent high-temperature corrosion of the water-cooled wall.

[0042] Furthermore, the detection gas dilution device includes a second electric valve and a second flow meter, one end of the second flow meter is connected to the outside air, and the other end is connected to one end of the second electric valve, the other end of the second electric valve is connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline, the reducing gas analyzer is simultaneously connected to the first electric valve, the second electric valve and the vacuum pump signal, the first flow meter and the second flow meter are both connected to the reducing gas analyzer signal,

[0043] A smoke pump is provided in the smoke pipe, one end of the smoke pump is connected to the smoke measurement point, and the other end is connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline. The reducing gas analyzer is connected to the smoke pump signal.

[0044] Wherein, the second electric valve is used to adjust its opening according to the feedback control signal of the reducing gas analyzer, so as to control the air intake flow rate;

[0045] The second flow meter is used to detect the intake flow rate of air and send the intake flow rate information to the reducing gas analyzer;

[0046] The flue gas pump is used to adjust its opening according to the feedback control signal of the reducing gas analyzer, so as to control the intake flow rate of the flue gas;

[0047] The reducing gas analyzer is used to detect the ratio of the mixed gas formed by air and flue gas. When the ratio of the mixed gas does not meet the preset ratio, the reducing gas analyzer feedback controls the opening of the second electric valve and the flue gas pump to adjust the ratio of the mixed gas to the preset ratio.

[0048] Specifically, the second electric valve and the second flowmeter in the detection gas dilution device work together with the reducing gas analyzer to accurately control the air intake flow rate. The second electric valve adjusts the opening according to the feedback signal of the reducing gas analyzer to ensure that the air enters the pipeline at an appropriate flow rate and mixes with the flue gas. The second flowmeter detects the air intake flow rate in real time and sends the information to the reducing gas analyzer to provide data support for the precise adjustment of the mixed gas ratio. The flue gas pump in the flue gas pipeline also adjusts its own opening to control the flue gas intake flow rate under the control of the reducing gas analyzer. In this way, the ratio of the mixed gas formed by air and flue gas can more accurately meet the preset ratio and improve the detection accuracy. As the core control component, the reducing gas analyzer can detect the ratio of the mixed gas, and timely feedback and control the opening of the second electric valve and the flue gas pump when the ratio does not meet the preset ratio, so as to realize the dynamic adjustment of the mixed gas ratio.

[0049] In this embodiment, the preset ratio of the mixed gas formed by air and flue gas is 5:1.

[0050] Furthermore, both the first flow meter and the second flow meter have filtering functions.

[0051] Specifically, the first flowmeter and the second flowmeter have a filtering function, which can effectively filter out impurities and particulate matter in the gas during the gas flow measurement process. It can not only protect the flowmeter itself, ensure its measurement accuracy and stability, and extend the service life of the flowmeter, but also prevent impurities from entering subsequent pipelines and equipment, such as reducing gas analyzers, vacuum pumps, etc., to reduce damage to these key equipment and reduce equipment maintenance costs. In addition, the filtered gas is purer, which is conducive to improving the accuracy of reducing gas analysis, thereby more accurately sensing the atmosphere of the water-cooled wall, providing a reliable basis for taking targeted improvement measures.

[0052] Furthermore, the improved wall-attached air supply pipeline is provided with a second check valve and a third electric valve in sequence, the second check valve is adjacent to the other end of the pipeline containing the water-cooled protective cover, one end of the third electric valve is connected to the boiler primary air extraction system, and the other end is connected to the boiler primary air extraction equipment, the reducing gas analyzer is connected to the third electric valve signal,

[0053] The reducing gas analyzer is also used to detect the content of reducing gas in the mixed gas when the mixed gas meets the preset ratio. When the reduced gas content extracted is too high, the first electric valve, the second electric valve and the vacuum pump are controlled to be closed, and the third electric valve in the wall-attached air supply improved pipeline is opened.

[0054] Specifically, the second check valve in the improved wall-adjacent air supply pipeline can prevent gas backflow, ensure the one-way flow of the wall-adjacent air, and provide guarantee for the stable operation of the system. Under the control of the reducing gas analyzer, the third electric valve is connected to the boiler's primary air extraction system and equipment, and can be precisely regulated according to the content of reducing gas in the mixed gas. When the mixed gas meets the preset ratio, the reducing gas analyzer detects the reducing gas content therein. If the content is too high, it can promptly control the relevant equipment to close and open the third electric valve, so that the boiler's primary air enters the improved wall-adjacent air supply pipeline, improves the atmosphere near the water-cooled wall, effectively reduces the risk of high-temperature corrosion of the water-cooled wall, and ensures the safe and stable operation of the boiler.

[0055] Further, see Figure 1 As shown, in the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, the flue gas measurement point and the wall wind nozzle are arranged at the lower position of the main combustion zone of the power plant pulverized coal furnace and the position between the SOFA wind, and above the corner of the cold ash hopper, for realizing the extraction of gas in the corresponding area and the delivery of wall wind; the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion are all located outside the boiler.

[0056] Specifically, by setting the flue gas measurement points and the wall-attached wind nozzles at the above specific positions, it is possible to accurately extract gas and deliver wall-attached wind to key areas such as the lower part of the main combustion zone of the power plant pulverized coal furnace and the SOFA wind, as well as above the corner of the cold ash hopper. In this way, the water-cooled wall atmosphere in these areas prone to high-temperature corrosion can be effectively sensed, and potential corrosion problems can be discovered and dealt with in a timely manner. At the same time, placing most of the equipment in the system outside the boiler not only facilitates the installation, maintenance and overhaul of the equipment, but also reduces the impact of the high-temperature environment on the equipment, and improves the reliability and service life of the equipment.

[0057] An application method of a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, based on the above-mentioned water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, the application method comprises:

[0058] S100, system installation: The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion is installed at the lower position of the main combustion zone of the power plant pulverized coal furnace and between the SOFA wind, as well as above the corner of the cold ash hopper;

[0059] S200, atmosphere perception:

[0060] S201, turning on the cooling water of the pipeline containing the water-cooled protective cover to ensure that the cooling water return temperature is lower than the operating temperature of the reducing gas analyzer, and at the same time closing the third electric valve in the wall-attached air supply improved pipeline to prevent the measured gas from entering the wall-attached air supply improved pipeline;

[0061] S202, opening the second electric valve in the detection gas dilution device, allowing air to enter the reducing gas detection and analysis pipeline through the second flow meter, and measuring the incoming air flow value;

[0062] S203, slowly open the first electric valve in the reducing gas detection and analysis pipeline, so that the flue gas at the measuring point enters the reducing gas detection and analysis pipeline through the flue gas pump and mixes with the air to form a mixed gas, while ensuring that the ratio of the reducing gas and the dilution air entering meets the test requirements. When the mass flow rate of the mixed gas per unit time is met, the reducing gas analyzer measures the reducing gas;

[0063] S300, reducing gas treatment steps:

[0064] S301. When the reducing gas analyzer detects that the reducing gas content in the mixed gas is lower than the preset value, the reducing gas analyzer controls the third electric valve of the wall-attached air supply improved pipeline to be in a closed state; when the reducing gas content in the mixed gas is detected to be higher than the preset value, first determine that the cooling water flow rate and the cooling water outlet temperature in the cooling water protective cover meet the preset values, then confirm that all the electric valves, flow meters, vacuum pumps, flue gas pumps and reducing gas analyzers in the system meet the opening requirements, and then confirm that the operating temperature of the reducing gas analyzer meets the operating environment requirements;

[0065] S302, the reducing gas analyzer closes the first electric valve, the second electric valve, the vacuum pump and the flue gas pump in the reducing gas detection and analysis pipeline, and stops the reducing gas detection and analysis process;

[0066] S303, open the third electric valve in the wall-attached air supply improvement pipeline, so that the boiler primary air passes through the second check valve, the third electric valve and the pipeline containing the water-cooled protective cover, and is ejected from the wall-attached air nozzle to purge the reducing high-temperature corrosive gas in the installation area and improve the atmosphere near the water-cooled wall;

[0067] S304. After performing the purge for 3 minutes, return to S200.

[0068] Specifically, in the system installation link, the present invention accurately installs the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion at the lower position of the main combustion area of ​​the power plant pulverized coal furnace and between the SOFA wind and above the corner of the cold ash hopper. These key areas are where the risk of high-temperature corrosion is high. By installing in these locations, targeted monitoring and treatment of specific areas can be achieved, greatly improving the efficiency and accuracy of preventing and controlling high-temperature corrosion.

[0069] During the atmosphere sensing stage, the cooling water in the pipeline containing the water-cooled protective cover is turned on, which not only ensures that the cooling water return temperature is lower than the operating temperature of the reducing gas analyzer and ensures the normal operation of the analyzer, but also closes the third electric valve in the wall-attached wind supply improved pipeline at the same time, effectively preventing the measured gas from entering the wall-attached wind supply improved pipeline, avoiding interference with the subsequent analysis process. The second electric valve in the detection gas dilution device is turned on to allow the air to accurately enter the reducing gas detection and analysis pipeline through the second flowmeter, and the air flow value is measured to lay the foundation for the subsequent mixing with the flue gas to form a mixed gas of appropriate proportion. Slowly open the first electric valve in the reducing gas detection and analysis pipeline to allow the flue gas at the measuring point to enter the pipeline through the flue gas pump and mix with the air to ensure that the mixing ratio meets the test requirements. When the mass flow rate of the mixed gas per unit time is met, the reducing gas analyzer performs accurate measurements, providing accurate data support for subsequent decision-making.

[0070] When entering the reducing gas treatment step, if the reducing gas analyzer detects that the reducing gas content in the mixed gas is lower than the preset value, the third electric valve of the wall-attached wind supply improvement pipeline is kept closed, realizing intelligent control and saving energy. When it is detected that the reducing gas content in the mixed gas is higher than the preset value, first determine that the cooling water flow rate and cooling water outlet temperature in the cooling water protective cover meet the preset values ​​to ensure the stable operation of the water cooling system; then confirm that all electric valves, flow meters, vacuum pumps, flue gas pumps and reducing gas analyzers in this system meet the opening requirements to ensure the reliability and accuracy of the equipment; then confirm that the operating temperature of the reducing gas analyzer meets the operating environment requirements to create good conditions for the normal operation of the analyzer. Then, the reducing gas analyzer closes the first electric valve, the second electric valve, the vacuum pump and the flue gas pump in the reducing gas detection and analysis pipeline, stops the reducing gas detection and analysis process, and switches the working mode in time. Open the third electric valve in the wall-attached air supply improvement pipeline, so that the boiler primary air passes through the second check valve, the third electric valve and the pipeline containing the water-cooled protective cover, and is ejected from the wall-attached air nozzle to purge the reducing high-temperature corrosive gas in the installation area, effectively improving the atmosphere near the water-cooled wall, reducing the risk of high-temperature corrosion, and ensuring the safety of the water-cooled wall. After performing the purge for 3 minutes, return to the atmosphere sensing step to form a continuous monitoring and governance cycle, ensuring the long-term stable operation of the boiler system.

[0071] In the atmosphere sensing step, it is necessary to close the third electric valve. Although the second check valve can prevent gas backflow to a certain extent, it mainly prevents backflow in the normal working direction. In this particular atmosphere sensing process, closing the third electric valve can more reliably ensure that the measured gas does not accidentally enter the boiler primary air bypass. Because when performing atmosphere sensing, the main purpose is to accurately measure the reducing gas content in the flue gas. If the measured gas enters the primary air bypass, it may interfere with the normal primary air flow and affect the combustion conditions of the boiler. It may also cause inaccurate measurement results and fail to truly reflect the actual situation of the water-cooled wall atmosphere.

[0072] The main function of the second check valve is to prevent the gas from flowing back when the normal flow direction is switched. For example, when switching from the reducing gas detection and analysis pipeline to the wall-attached air supply improvement pipeline, it can prevent the wall-attached air from flowing back to the reducing gas detection and analysis pipeline. However, it cannot completely replace the closing function of the third electric valve in the atmosphere sensing process. The check valve is usually a passive anti-backflow device that relies on the pressure difference of the fluid to work. In some special cases, such as system pressure fluctuations, start-stop processes, etc., the check valve alone may not be able to completely eliminate the possibility of the measured gas entering the primary air bypass. The electric valve can actively and completely cut off or open the airflow channel according to the instructions of the control system to provide more precise and reliable airflow control. Therefore, closing the third electric valve in the atmosphere sensing step is to better achieve the independence and accuracy of the measurement process.

[0073] A storage medium stores a computer program, which, when executed by a processor, implements an application method of the above-mentioned water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion.

[0074] Specifically, the computer program stored on the storage medium can realize the application method of the water-cooled wall atmosphere perception and improvement system for targeted prevention and control of high-temperature corrosion, and provide software support for the operation of the system. By executing the computer program through the processor, each link of the entire system can be accurately controlled, from the determination of the location of the system installation to the cooling water control, the mixing and measurement of air and flue gas in the atmosphere perception stage, and then to the intelligent judgment and equipment operation in the reducing gas treatment step, so as to achieve efficient prevention and control of high-temperature corrosion of the water-cooled wall of the power plant pulverized coal boiler. This storage medium makes the application of the system more convenient and reliable. It can be easily installed and run on different devices, which improves the versatility and scalability of the system. At the same time, the storage medium can store computer programs for a long time to ensure the stability and sustainability of the system. In practical applications, it is only necessary to combine the storage medium with a suitable processor to achieve accurate perception and improvement of the water-cooled wall atmosphere, providing a strong guarantee for the safe operation of the power plant pulverized coal boiler.

[0075] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the application method of the above-mentioned water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion.

[0076] Specifically, firstly, the present invention stores computer programs in a memory, thereby ensuring safe storage and calling of programs at any time. The processor can efficiently execute the computer programs stored in the memory, and realize accurate control of the water-cooled wall atmosphere perception and improvement system for targeted prevention and control of high-temperature corrosion. In practical applications, the computer device can accurately execute the application method of the system, from determining the location of the system installation, to fine control of cooling water, accurate mixing of air and flue gas, and accurate measurement of reducing gas in the atmosphere perception stage, to intelligent judgment and equipment operation switching in the reducing gas treatment step. It can monitor and analyze the reducing gas content in the water-cooled wall atmosphere in real time, start the wall wind supply improvement measures in time according to the situation, purge the high reducing gas area near the water-cooled wall, effectively improve the atmosphere, and reduce the risk of high-temperature corrosion. This computer device has high reliability and stability. It can adapt to complex industrial environments, operate continuously and stably, and provide strong guarantee for the safe operation of power plant pulverized coal furnaces. At the same time, it has strong scalability and can be upgraded and optimized according to actual needs to meet the ever-changing industrial production requirements. In short, this computer equipment, combined with the application method of the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, provides an efficient and intelligent solution for the prevention and control of high-temperature corrosion of the water-cooled walls of pulverized coal boilers in power plants.

[0077] The present invention discloses a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion and an application method thereof. By setting a reducing gas detection and analysis pipeline and a wall-adhering wind supply improvement pipeline, the reducing gas content in the mixed gas can be accurately detected. When the content is too high, the working state can be switched in time, the detection-related valves can be closed, and the valve of the wall-adhering wind supply improvement pipeline can be opened. The wall-adhering wind can be used to purge the high-reducing gas area near the water-cooled wall to improve the atmosphere, thereby effectively reducing the risk of high-temperature corrosion of the water-cooled wall, extending the service life of the water-cooled wall, and ensuring the safe and stable operation of the boiler.

[0078] It should be noted that, in this article, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, characterized in that: It includes a wall-attached wind nozzle, a pipeline containing a water-cooled protective cover, a reducing gas detection and analysis pipeline, and an improved wall-attached wind supply pipeline. The wall-attached wind nozzle is connected to one end of the pipeline containing the water-cooled protective cover, and the other end of the pipeline containing the water-cooled protective cover is simultaneously connected to the reducing gas detection and analysis pipeline and the improved wall-attached wind supply pipeline.

2. The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to claim 1 is characterized in that: The reducing gas detection and analysis pipeline is provided with a first check valve, a first electric valve, a first flow meter, a vacuum pump and a reducing gas analyzer in sequence, and the check valve is adjacent to the other end of the pipeline containing the water-cooled protective cover.

3. The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to claim 2 is characterized in that: The reducing gas analyzer signal is connected to a detection gas dilution device and a flue gas duct. One end of the detection gas dilution device and the flue gas duct are both connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline. The other end of the detection gas dilution device is connected to the outside air, and the other end of the flue gas duct is connected to the flue gas measurement point.

4. The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to claim 3 is characterized in that: The detection gas dilution device includes a second electric valve and a second flow meter, one end of the second flow meter is connected to the outside air, and the other end is connected to one end of the second electric valve, the other end of the second electric valve is connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline, the reducing gas analyzer is simultaneously connected to the first electric valve, the second electric valve and the vacuum pump signal, the first flow meter and the second flow meter are both connected to the reducing gas analyzer signal, A smoke pump is provided in the smoke pipe, one end of the smoke pump is connected to the smoke measurement point, and the other end is connected to the pipeline between the first check valve and the first electric valve in the reducing gas detection and analysis pipeline. The reducing gas analyzer is connected to the smoke pump signal. Wherein, the second electric valve is used to adjust its opening according to the feedback control signal of the reducing gas analyzer, so as to control the air intake flow rate; The second flow meter is used to detect the intake flow rate of air and send the intake flow rate information to the reducing gas analyzer; The flue gas pump is used to adjust its opening according to the feedback control signal of the reducing gas analyzer, so as to control the intake flow rate of the flue gas; The reducing gas analyzer is used to detect the ratio of the mixed gas formed by air and flue gas. When the ratio of the mixed gas does not meet the preset ratio, the reducing gas analyzer feedback controls the opening of the second electric valve and the flue gas pump to adjust the ratio of the mixed gas to the preset ratio.

5. The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to claim 4 is characterized in that: The first flow meter and the second flow meter both have filtering functions.

6. The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to claim 5 is characterized in that: The improved wall-attached air supply pipeline is provided with a second check valve and a third electric valve in sequence. The second check valve is adjacent to the other end of the pipeline containing the water-cooled protective cover. One end of the third electric valve is connected to the boiler primary air extraction system, and the other end is connected to the boiler primary air extraction equipment. The reducing gas analyzer is connected to the third electric valve signal. The reducing gas analyzer is also used to detect the content of reducing gas in the mixed gas when the mixed gas meets the preset ratio. When the reduced gas content extracted is too high, the first electric valve, the second electric valve and the vacuum pump are controlled to be closed, and the third electric valve in the wall-attached air supply improved pipeline is opened.

7. The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to claim 6 is characterized in that: In the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, the flue gas measurement point and the wall wind nozzle are arranged between the lower position of the main combustion zone of the power plant pulverized coal furnace and the SOFA wind, and above the corner of the cold ash hopper, for realizing the extraction of gas in the corresponding area and the delivery of wall wind; the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion is located outside the boiler.

8. An application method of a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion, based on the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion according to any one of claims 1 to 7, characterized in that: The application method comprises: S100, system installation: The water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion is installed at the lower position of the main combustion zone of the power plant pulverized coal furnace and between the SOFA wind, as well as above the corner of the cold ash hopper; S200, atmosphere perception: S201, turning on the cooling water of the pipeline containing the water-cooled protective cover to ensure that the cooling water return temperature is lower than the operating temperature of the reducing gas analyzer, and at the same time closing the third electric valve in the wall-attached air supply improved pipeline to prevent the measured gas from entering the wall-attached air supply improved pipeline; S202, opening the second electric valve in the detection gas dilution device, allowing air to enter the reducing gas detection and analysis pipeline through the second flow meter, and measuring the incoming air flow value; S203, slowly open the first electric valve in the reducing gas detection and analysis pipeline, so that the flue gas at the measuring point enters the reducing gas detection and analysis pipeline through the flue gas pump and mixes with the air to form a mixed gas, while ensuring that the ratio of the reducing gas and the dilution air entering meets the test requirements. When the mass flow rate of the mixed gas per unit time is met, the reducing gas analyzer measures the reducing gas; S300, reducing gas treatment steps: S301. When the reducing gas analyzer detects that the reducing gas content in the mixed gas is lower than the preset value, the reducing gas analyzer controls the third electric valve of the wall-attached air supply improved pipeline to be in a closed state; when the reducing gas content in the mixed gas is detected to be higher than the preset value, first determine that the cooling water flow rate and the cooling water outlet temperature in the cooling water protective cover meet the preset values, then confirm that all the electric valves, flow meters, vacuum pumps, flue gas pumps and reducing gas analyzers in the system meet the opening requirements, and then confirm that the operating temperature of the reducing gas analyzer meets the operating environment requirements; S302, the reducing gas analyzer closes the first electric valve, the second electric valve, the vacuum pump and the flue gas pump in the reducing gas detection and analysis pipeline, and stops the reducing gas detection and analysis process; S303, open the third electric valve in the wall-attached air supply improvement pipeline, so that the boiler primary air passes through the second check valve, the third electric valve and the pipeline containing the water-cooled protective cover, and is ejected from the wall-attached air nozzle to purge the reducing high-temperature corrosive gas in the installation area and improve the atmosphere near the water-cooled wall; S304. After performing the purge for 3 minutes, return to S200.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the application method of the water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion as described in claim 8 is implemented.

10. A computer device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the application method of a water-cooled wall atmosphere sensing and improvement system for targeted prevention and control of high-temperature corrosion as described in claim 8.

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