Intelligent adjusting power plant combustor and adjusting method thereof

Abstract

The invention discloses an intelligent adjustment power plant combustor and an adjustment method thereof, and relates to the technical field of power plant combustors, and the combustor comprises a combustion assembly, a flue gas circulation assembly, a gas inlet adjustment assembly, a fuel gas supply assembly, a control system and a monitoring module. The controller controls the opening degree of related parts according to fuel, air volume and nitrogen oxide monitoring data, combustion optimization is achieved, and nitrogen oxide emission is reduced. The adjustment method comprises the steps of data setting, starting, ignition, operation adjustment, shutdown and fault processing. The combustor can accurately control all parameters, improve combustion efficiency, enhance safety and reliability, flexibly cope with working condition changes, effectively solve the problems that a traditional combustor is high in nitrogen oxide emission, unstable in combustion and the like, is suitable for the fields such as power plants needing efficient and clean combustion, and has remarkable environmental protection and economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field related to power plant burners, and in particular to an intelligently regulating power plant burner and a regulating method thereof. Background Art

[0002] There are many problems with traditional burners during the combustion process in power plants. On the one hand, the emission of nitrogen oxides is large, causing serious pollution to the environment. With increasingly stringent environmental protection requirements, there is an urgent need to reduce nitrogen oxide emissions. On the other hand, it is difficult to accurately control the flame temperature and air-fuel ratio during the combustion process, resulting in low combustion efficiency and serious energy waste. For example, when some burners are in operation, they are unable to adjust the fuel and air supply in real time according to the actual operating conditions, resulting in incomplete combustion or excessive combustion. At the same time, traditional burners lack effective monitoring and control methods for the nitrogen oxide content in the flue gas, and cannot take timely measures to reduce the generation of nitrogen oxides. In addition, the safety and reliability of the ignition and shutdown processes needs to be improved. For example, ignition failures and abnormal shutdowns occur from time to time, affecting the normal operation of power plants and increasing maintenance costs and safety risks. Summary of the invention

[0003] The object of the present invention is to provide an intelligent regulating power plant burner to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an intelligent adjustment power plant burner, comprising: A combustion assembly, comprising a combustion chamber, a combustion nozzle assembly and an exhaust gas bin, wherein a combustion nozzle assembly connected to a mixing pipe is installed inside the combustion chamber, and the combustion chamber is connected to the exhaust gas bin; The smoke circulation component includes a pipeline with an electrically controlled smoke return one-way valve and a smoke return main valve, a gas collection chamber and a turbine fan. The tail gas chamber is connected to the mixing pipeline through the pipeline with the electrically controlled smoke return one-way valve and the smoke return main valve. The tail of the mixing pipeline is equipped with a turbine fan through the gas collection chamber. An air intake adjustment component, including an air intake adjustment baffle, which is installed on the side of the turbine fan; A gas supply assembly, including a gas electric control valve, a gas main valve, a three-way pipeline, an auxiliary fuel tank, a gas tank and a tank support frame, wherein the mixing pipeline is connected to the auxiliary fuel tank and the gas tank respectively through a three-way pipeline with a gas electric control valve and a gas main valve, and the auxiliary fuel tank and the gas tank are installed and fixed through the tank support frame; A control system, comprising a controller, an air flow regulating module, a fuel flow regulating module and a flue gas flow regulating module, wherein the controller is connected to the air flow regulating module, the fuel flow regulating module and the flue gas flow regulating module respectively, the air flow regulating module is connected to an air intake regulating baffle, the fuel flow regulating module is connected to a gas electric control valve, and the flue gas flow regulating module is connected to an electric-controlled smoke return one-way valve; The controller is also connected to a monitoring module, which includes a fuel monitoring unit, an air volume monitoring unit and a nitrogen oxide monitoring unit, wherein the fuel monitoring unit is used to monitor the fuel flow, the air volume monitoring unit is used to monitor the air flow, and the nitrogen oxide monitoring unit is used to monitor the nitrogen oxide content in the flue gas; The controller adjusts the air flow, fuel flow and flue gas flow according to the monitoring data of the fuel monitoring unit, the air volume monitoring unit and the nitrogen oxide monitoring unit by controlling the opening of the air intake regulating damper, the opening of the gas electric control valve and the opening of the electric control smoke return one-way valve, so as to make the combustion flame low in nitrogen and low in temperature, and efficiently control the value of nitrogen oxides in flame combustion, thereby reducing nitrogen oxide emissions.

[0005] Further, the gas supply assembly also includes a gas pressure regulating valve, a gas pressure protection device, an automatic safety shut-off valve, a bypass start-up gas valve, a gas valve leak detection device, an ignition transformer, a flame monitoring device and an air pressure monitoring device; The gas pressure regulating valve is used to adjust the gas pressure to ensure a stable air-fuel ratio of the burner; The gas pressure protection device is used to monitor the gas pressure and can provide interlock protection when the gas pressure is lower than the low pressure setting value or exceeds the design value by 1.3 times; The automatic safety shut-off valve closes quickly and automatically when power is lost; The bypass start-up gas valve is used for rapid start and stop, and to adjust the gas flow, and also has a safety cut-off function; The gas valve leakage detection device is used to detect gas leakage of the gas valve group and the electric valve; The ignition transformer is used to ignite the gas; The flame monitoring device is used to monitor the flame during ignition and operation; The air pressure monitoring device is used to monitor the air supply status during the start-up and operation of the burner.

[0006] Furthermore, the control system also includes an automatic controller and an electronic ratio adjustment device; The automatic controller adopts Siemens LMV5X series, which is used to control the ignition program of the burner, the fuel and air ratio, the oxygen amount adjustment, and the blast burner power adjustment; The electronic ratio regulating device is equipped with a servo motor, which is used to adjust the opening of the gas butterfly valve, the air door damper and the auxiliary recirculation flue gas damper on the burner to adjust the air-fuel ratio and ensure sufficient combustion.

[0007] Furthermore, a pressure balancing device is provided between the auxiliary fuel tank and the gas tank in the gas supply assembly. The pressure balancing device is used to ensure that the pressure between the auxiliary fuel tank and the gas tank is stable and balanced during the process of supplying gas to the mixing pipe, so as to ensure the stability of the gas supply and avoid unstable combustion or abnormal changes in gas flow due to pressure fluctuations, thereby affecting the combustion effect and nitrogen oxide emission control.

[0008] Furthermore, the air intake regulating baffle in the air intake regulating assembly adopts a segmented adjustable structure, including at least two sections of regulating blades with different areas. The controller can independently control the opening of each section of the regulating blades according to different operating conditions and adjustment requirements, thereby achieving more precise air intake volume adjustment, further optimizing the air and fuel ratio during the combustion process, improving combustion efficiency, and reducing nitrogen oxide generation.

[0009] A method for intelligently regulating a power plant burner comprises the following steps: Data setting steps: Set the fuel type to natural gas; set the low pressure switch dial to 10kPa, the high pressure switch dial to 40kPa, the leak detection setting to 5kPa, and the wind pressure switch setting to 20kPa; set the front purge cleaning time to 30s; set the safety ignition time, direct ignition delay time to 2s, flame delay time to 3s, and main fire time to 5s; set the rear purge cleaning time to 20-30s; Startup steps: Confirm that the interlocking device is correctly installed; verify that the fan contact is flexible and has no jamming; verify that the gas pressure switch device functions correctly and reliably; verify the functionality of the air monitoring device; verify the effectiveness of the valve leak detection device; the position of the fuel, air, and flue gas flow control devices is correct and the communication is normal; the functionality of the flame detection device must be verified to be correct; the burner startup meets other requirements for boiler operation; Ignition steps: ignite the ignition burner, first energize the valve leak detection device for leak detection, then the electric spark ignition device is automatically energized, and finally the ignition gas valve is energized; before starting, the upstream main gas safety shut-off valve is energized first, and the downstream main gas safety shut-off valve is not energized. After the ignition gas is drawn from the middle of the two main gas shut-off valves, the upstream main gas safety shut-off valve is closed; the main burner is started, first start the ignition burner to quickly ignite, and after the ignition flame is confirmed by the flame monitoring device sensor, when entering the next period, ignite the main fire flame in the process of opening the upstream and downstream main fuel safety shut-off valves. After the main flame is established, it is necessary to confirm that the verification of the main fire safety time has passed, otherwise it should be interlocked for protection; Operation adjustment steps: After the burner is ignited, it enters the operation stage. The controller monitors the fuel, air volume and nitrogen oxide content at the same time, and adjusts the opening of the air intake adjustment damper, the opening of the gas electric control valve and the opening of the electric control smoke return check valve according to the monitoring data, controls the return flue gas to merge into the combustion air to reduce its oxygen content, reduce the flame combustion temperature, make the combustion flame low in nitrogen and low in temperature, and efficiently control the value of flame combustion nitrogen oxides, thereby reducing nitrogen oxide emissions, wherein the smoke return flow rate is controlled below 25% of the total flue gas volume; Shutdown steps: including controlled shutdown, safety shutdown and interlock protection shutdown. In controlled shutdown, the burner receives the shutdown command from the external physical quantity adjustment protection device and enters the shutdown sequence; in safety shutdown, if the burner is in the startup process or working state, if there is a power outage, gas interruption or abnormality, and the gas pressure drops sharply below the set value, the burner should be shut down safely immediately; in interlock protection shutdown, if there is a gas valve leakage alarm signal, flame detection fault signal, gas high and low pressure protection signal, air pressure fault signal, servo motor drive position verification abnormal signal and boiler-related control parameter over-limit signal during the startup and operation process, the burner should be interlocked and shut down; Fault handling steps: If a fault occurs during the pre-purge period and the burner has an abnormal air flow detection, it must be shut down safely and immediately enter the interlock protection sequence. After completely shutting down, it must be restarted. If the fault occurs again, it should be shut down immediately and interlocked for protection. The abnormality must be found and handled before it can be operated again; Flame failure during ignition: If the burner has an abnormality during ignition, it should be shut down immediately and then enter the interlock protection sequence. After shutdown, the pre-purge and various ignition procedures can be re-executed to check for leaks. It can be restarted at most once. If the abnormality still exists during the restart process, it must be shut down safely and enter interlock protection until the fault is resolved. If a flame failure occurs during operation: If the burner fails to operate or loses fire during operation, the flame monitoring device cannot monitor the flame normally. The programmable controller should be shut down safely and interlocked for protection immediately. After analyzing and handling the fault, it can be operated again.

[0010] Furthermore, in the operation adjustment step, when the nitrogen oxide content is higher than the set value, the controller increases the opening of the electronically controlled smoke return check valve, increases the amount of returned smoke, reduces the oxygen content of the combustion-supporting air, reduces the flame combustion temperature, and reduces the generation of nitrogen oxides; when the nitrogen oxide content is lower than the set value and the combustion is unstable, the controller appropriately reduces the opening of the electronically controlled smoke return check valve, and at the same time adjusts the opening of the air intake adjustment baffle and the gas electronically controlled valve, optimizes the air and fuel ratio, and improves combustion stability.

[0011] Furthermore, in the ignition step, if the ignition fails, the controller records the ignition failure information, including the ignition time, gas pressure, and air pressure parameters, analyzes the cause of the ignition failure, adjusts the ignition parameters, such as the ignition delay time and gas flow, and then re-performs the ignition operation. If the ignition fails multiple times, a fault alarm signal is issued to prompt the operator to perform maintenance.

[0012] Furthermore, in the operation adjustment step, when it is monitored that the fuel flow fluctuation exceeds the preset threshold, the controller quickly and dynamically adjusts the gas electric control valve through the fuel flow adjustment module according to the data feedback from the fuel monitoring unit, so that the fuel flow is stabilized within the normal range. At the same time, the coordinated adjustment of the air intake adjustment baffle and the electronically controlled smoke return one-way valve is combined to ensure that the combustion flame always maintains a low-nitrogen, low-temperature and stable state, effectively controlling nitrogen oxide emissions and ensuring safe and efficient operation of the burner.

[0013] Furthermore, in the ignition step, before the ignition gas valve is energized, the ignition gas pipeline is pre-purged, the pre-purging time is 5-10 seconds, the pre-purging gas is compressed air, and the pre-purging pressure is 0.1-0.3MPa. The pre-purging is used to remove impurities and air that may exist in the ignition gas pipeline, thereby improving the ignition success rate, reducing the safety risks during the ignition process, and ensuring the smooth progress of the ignition process. After each ignition failure, a self-inspection procedure for each component of the ignition system is added, including checking the electrode gap of the electric spark ignition device and the sealing of the ignition gas valve, so as to quickly and accurately locate the cause of the ignition failure and improve the success rate of subsequent ignition operations.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The intelligent regulating power plant burner of the present invention works in coordination with the controller and the monitoring module to obtain fuel flow, air flow and nitrogen oxide content data in real time. It accurately controls the opening of the air intake regulating baffle, the gas electric control valve and the electric control smoke return check valve, effectively regulates the air, fuel and flue gas flow, realizes low-nitrogen and low-temperature combustion of the combustion flame, greatly reduces nitrogen oxide emissions, and meets environmental protection requirements.

[0015] The various components in the gas supply assembly ensure a stable gas supply and a stable air-fuel ratio. The automatic controller and electronic ratio adjustment device in the control system accurately control the ignition program, fuel and air ratio, so that the fuel is fully burned, the energy utilization efficiency is improved, and the energy consumption is reduced.

[0016] The gas pressure protection device, bypass start gas valve, gas valve leak detection device, etc. in the gas supply components, as well as the interlock protection mechanism in the control system, can timely interlock protection or safe shutdown in the case of abnormal gas pressure, valve leakage, etc. In the ignition, operation and shutdown stages, strict procedures and monitoring are used to effectively avoid safety accidents and ensure stable and reliable operation of the burner.

[0017] The segmented adjustable structure of the air intake regulating baffle can accurately adjust the air intake volume according to different working conditions; the pressure balancing device between the auxiliary fuel tank and the gas tank ensures stable gas supply; during operation adjustment, real-time adjustments are made according to fuel flow fluctuations, so that the burner can adapt to various complex working conditions, always maintain a good operating state, and improve the stability and adaptability of power plant operation.

[0018] The detailed operating procedures and safety measures in the ignition steps improve the ignition success rate, reduce the ignition risk, reduce equipment loss and downtime caused by ignition failure, and ensure that the burner starts smoothly and enters a stable operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the adjustment process of the structure of the present invention.

[0020] In the figure: 1. Combustion chamber; 2. Tail gas chamber; 3. Combustion nozzle assembly; 4. Electric smoke return one-way valve; 5. Smoke return main valve; 6. Air intake adjustment baffle; 7. Turbine fan; 8. Gas collecting chamber; 9. Mixing pipe; 10. Gas electric control valve; 11. Gas main valve; 12. Three-way pipe; 13. Auxiliary fuel tank; 14. Gas tank; 15. Tank support frame. DETAILED DESCRIPTION

[0021] See also Figure 1-2 The present invention provides a technical solution: an intelligent regulating power plant burner, comprising: a combustion chamber 1 is made of high temperature resistant and corrosion resistant alloy steel material, and its internal space is designed to be streamlined to reduce airflow resistance and ensure that the fuel and air can be fully mixed and burned. The inner wall of the combustion chamber 1 is coated with a high temperature resistant heat insulation coating to effectively reduce heat loss and improve combustion efficiency. Its shape is cylindrical, and the diameter is designed according to the power size of the burner, generally between 0.5-2 meters, and the ratio of height to diameter is between 1.5-3, so as to ensure that the fuel has enough residence time in the combustion chamber to achieve complete combustion.

[0022] A fuel inlet and an air inlet are provided at the front end of the combustion chamber 1. The fuel inlet is connected to the combustion nozzle assembly 3, and the air inlet is connected to the mixing duct 9. A flow equalizing device is installed at the air inlet to ensure that the air entering the combustion chamber 1 is evenly distributed and fully mixed with the fuel.

[0023] The combustion nozzle assembly 3 uses advanced atomization technology to evenly spray the gas into the combustion chamber 1. The nozzle is made of a special alloy material with high temperature resistance, wear resistance and corrosion resistance. The nozzle aperture is precisely designed according to the gas flow and pressure requirements, generally between 0.5-5 mm, and a swirl device is provided inside the nozzle to form a swirling airflow when the gas is sprayed out, increase the contact area with the air, and improve the mixing effect.

[0024] The combustion nozzle assembly 3 and the fuel supply pipeline are connected by a sealing method with good sealing performance, such as flange connection or welding, to prevent gas leakage. At the same time, a cooling air duct is arranged around the combustion nozzle assembly 3 to cool the nozzle by introducing cold air to ensure its normal operation in a high temperature environment.

[0025] The tail gas bin 2 is connected to the rear end of the combustion chamber 1 and is used to collect the exhaust gas after combustion. The tail gas bin 2 adopts a steel structure and is equipped with a guide plate inside to guide the exhaust gas to flow in an orderly manner and reduce vortex and resistance. The volume of the tail gas bin 2 is designed according to the exhaust volume of the burner, which is generally 0.5-1.5 times the volume of the combustion chamber 1 to ensure that the exhaust gas has enough buffer space, reduce the exhaust gas emission speed, and reduce the impact on subsequent equipment.

[0026] An exhaust gas discharge port is provided at the top or side of the exhaust gas bin 2, and an exhaust gas temperature sensor and a pressure sensor are installed at the discharge port to monitor the temperature and pressure of the exhaust gas in real time and provide data support for the operation adjustment of the burner.

[0027] The pipeline with the electric-controlled smoke return one-way valve 4 and the smoke return main valve 5 is made of high-temperature resistant and corrosion-resistant stainless steel material, and its inner diameter is designed according to the smoke flow rate, generally between 0.1-0.5 meters. The inner wall of the pipeline is smooth to reduce the smoke flow resistance. The electric-controlled smoke return one-way valve 4 and the smoke return main valve 5 are installed on the pipeline. The electric-controlled smoke return one-way valve 4 is used to control whether the smoke in the tail gas bin 2 flows back to the mixing pipe 9. Its opening and closing are controlled by the controller according to the operating conditions. The smoke return main valve 5 serves as a main switch, which can completely cut off the smoke return pipe during equipment maintenance or special circumstances.

[0028] The electric control smoke return check valve 4 is driven by a solenoid valve and has the characteristics of fast response and high sealing. The valve disc is made of wear-resistant and high-temperature resistant alloy material, and the sealing surface adopts a special sealing structure, such as soft seal or a combination of hard seal and soft seal, to ensure that smoke will not leak under high temperature and high pressure. The smoke return main valve 5 is a manual and electric dual-purpose valve, which is usually controlled by electric control and can be manually operated in an emergency.

[0029] The air collecting bin 8 is located at the tail end of the mixing pipe 9, and is used to collect the air sent by the turbine fan 7 and the returned flue gas, and perform preliminary mixing. The air collecting bin 8 adopts a circular or square steel structure, and is provided with a baffle and a guide device inside, so that the air and flue gas are fully mixed in the air collecting bin 8 before entering the burner. The volume of the air collecting bin 8 is designed according to the air volume and the return smoke volume of the burner, and is generally 0.5-2 cubic meters to ensure sufficient mixing space.

[0030] Pressure monitoring points and temperature monitoring points are arranged on the top or side of the gas collecting bin 8 to monitor the pressure and temperature changes in the gas collecting bin 8 in real time to prevent damage to the equipment caused by excessive pressure or abnormal temperature.

[0031] The turbo fan 7 is a high-efficiency centrifugal fan, and its impeller is made of high-strength aluminum alloy or stainless steel, with good dynamic balance performance. The air volume of the fan is designed according to the power and combustion requirements of the burner, generally between 1000-100000 cubic meters / hour, and the wind pressure is between 1000-10000 Pa. The turbo fan 7 is driven by a motor, and the motor adopts variable frequency speed regulation technology, which can adjust the fan speed according to the instructions of the controller, so as to accurately control the air intake.

[0032] The turbine fan 7 is installed on a shock-absorbing base to reduce the impact of vibration generated when the fan is running on the equipment and foundation. A flexible connection, such as a rubber flexible joint, is used between the inlet and outlet of the fan and the pipeline to prevent the pipeline stress from being transmitted to the fan, while facilitating the installation and maintenance of the fan.

[0033] The air intake regulating baffle 6 adopts a segmented adjustable structure as described in claim 8, and is composed of at least two sections of regulating blades with different areas. The regulating blades are made of stainless steel with a smooth surface to reduce air resistance. The opening of each section of the regulating blade is controlled by an independent electric actuator, which is connected to the controller, receives the signal of the controller, and accurately controls the opening angle of the regulating blade.

[0034] The air intake regulating baffle 6 is installed on the side of the turbo fan 7, perpendicular to the air intake duct. When the controller determines that the air intake needs to be increased based on the monitoring data, the electric actuator drives the regulating blade to open and increase the area of ​​the air intake channel; when the air intake needs to be reduced, the regulating blade is closed to reduce the area of ​​the air intake channel. Through segmented regulation, more precise air intake control can be achieved to meet the combustion requirements under different working conditions.

[0035] The gas electric control valve 10 and the gas main valve 11 use high-precision electromagnetic valves to accurately control the gas flow. The gas electric control valve 10 adjusts the gas flow according to the instructions of the controller. Its flow adjustment range is designed according to the power of the burner, generally between 10-1000 cubic meters / hour. The gas main valve 11 serves as the main switch for gas supply, controlling the on and off of gas when the equipment is started, stopped, or in an emergency.

[0036] The three-way pipe 12 is made of stainless steel, and its inner diameter is designed according to the gas flow rate, generally between 0.05-0.3 meters. The three interfaces of the three-way pipe 12 are respectively connected to the mixing pipe 9, the gas electric control valve 10 and the gas main valve 11, and the connection method is welding or flange connection to ensure a firm connection and good sealing.

[0037] The auxiliary fuel tank 13 and the gas tank 14 are made of high-strength carbon steel or stainless steel and have good pressure resistance. The volume of the tank is designed according to the operating time and gas consumption rate of the burner. Generally, the volume of the auxiliary fuel tank 13 is 1-10 cubic meters, and the volume of the gas tank 14 is 10-100 cubic meters. The auxiliary fuel tank 13 is mainly used to provide temporary gas supplement when the gas tank 14 is switched or the pressure is unstable, so as to ensure the continuous operation of the burner.

[0038] The tank support frame 15 is made of steel structure and is designed according to the size and weight of the auxiliary fuel tank 13 and the gas tank 14 to ensure that the tank is installed firmly and stably. Shock-absorbing pads are provided on the support frame to reduce the vibration impact on the tank during operation. Liquid level sensors, pressure sensors and temperature sensors are installed on the tank to monitor the gas liquid level, pressure and temperature in the tank in real time, and transmit the data to the controller to control and manage the gas supply.

[0039] A pressure balancing device is provided between the auxiliary fuel tank 13 and the gas tank 14. The pressure balancing device is composed of a connecting pipe and a pressure regulating valve. The connecting pipe connects the gas phase space of the auxiliary fuel tank 13 and the gas tank 14. The pressure regulating valve automatically adjusts the gas flow rate according to the pressure difference in the two tanks, so that the pressure in the auxiliary fuel tank 13 and the gas tank 14 remains stable and balanced, ensuring the stability of the gas supply.

[0040] The controller adopts a high-performance programmable logic controller PLC, which has powerful data processing capabilities and fast response speed. The controller has a built-in special combustion control algorithm. According to the data fed back by the fuel monitoring unit, air volume monitoring unit and nitrogen oxide monitoring unit, it calculates and controls the opening of the air intake damper 6, the gas electric control valve 10 and the electric control smoke return check valve 4 in real time to achieve optimal control of the combustion process.

[0041] The controller also has a communication function, which can communicate with the host computer through Ethernet or serial port to achieve remote monitoring and operation. The operator can set the operating parameters of the burner on the host computer, view the operating status and historical data of the burner, and facilitate the management and maintenance of the burner.

[0042] The air flow regulating module is connected to the electric actuator of the air intake regulating damper 6, receives the control signal of the controller, converts it into the action signal of the electric actuator, controls the opening of the air intake regulating damper 6, and thus regulates the air flow. The fuel flow regulating module is connected to the gas electric control valve 10, adjusts the opening of the gas electric control valve 10 according to the instructions of the controller, and controls the gas flow. The smoke flow regulating module is connected to the electric control smoke return check valve 4, controls the opening and closing of the electric control smoke return check valve 4, and regulates the flow of the returned smoke.

[0043] These regulation modules all use high-precision sensors and actuators. The sensors monitor air flow, fuel flow and flue gas flow in real time and feed the data back to the controller. The actuators can quickly and accurately execute the controller's instructions to achieve precise flow regulation.

[0044] The fuel monitoring unit is installed on the gas supply pipeline and uses a high-precision gas flow meter, such as a turbine flow meter or a mass flow meter, to monitor the gas flow in real time. The flow meter has a measurement accuracy of ±0.5%-±1%, and can accurately measure the instantaneous flow and cumulative flow of the gas. The fuel monitoring unit transmits the measurement data to the controller, providing a basis for the controller to adjust the gas flow.

[0045] The air volume monitoring unit is installed on the air intake duct and uses a pitot tube or a thermal flow meter to measure the air flow. The pitot tube calculates the air flow by measuring the static pressure and dynamic pressure in the duct, while the thermal flow meter measures the flow by using the heat transfer principle when the air flows through the heating element. The air volume monitoring unit has a measurement accuracy of ±1%-±2%, and can accurately monitor the intake volume in real time and feed the data back to the controller so that the controller can adjust the opening of the intake damper 6.

[0046] The nitrogen oxide monitoring unit is installed on the exhaust pipe and uses an advanced chemiluminescence or electrochemical nitrogen oxide analyzer to monitor the nitrogen oxide content in the exhaust gas in real time. The analyzer has a measurement range of 0-1000ppm and a measurement accuracy of ±2%-±5%, which can quickly and accurately detect the concentration of nitrogen oxides. The nitrogen oxide monitoring unit transmits the monitoring data to the controller. When the nitrogen oxide content exceeds the set value, the controller initiates the corresponding adjustment measures to reduce nitrogen oxide emissions.

[0047] Implementation steps of an intelligent regulation method for a power plant burner: The fuel type is set to natural gas because it is one of the commonly used fuels for power plant burners due to its advantages of cleanliness, high efficiency, and stable combustion. The relevant parameters of natural gas, such as calorific value, density, and combustion characteristics, are input into the controller so that the controller can perform combustion control calculations based on these parameters.

[0048] The low-pressure switch dial setting value is 10kPa. When the gas pressure is lower than this value, the gas pressure protection device triggers the interlock protection to prevent unstable combustion or flameout due to low gas pressure. The high-pressure switch dial setting value is 40kPa. When the gas pressure exceeds this value, the interlock protection is also triggered to prevent damage to the equipment caused by excessive gas pressure. The leak detection setting value is 5kPa, which is used by the gas valve leak detection device to detect gas leaks in the gas valve group and electric valve to ensure the safety of the gas system. The wind pressure switch setting value is 20kPa, which is used to monitor the air supply status during the start-up and operation of the burner. When the wind pressure is lower than this value, the burner stops running to prevent incomplete combustion due to insufficient air volume.

[0049] The pre-purge cleaning time is set to 30s. Before the burner is started, the turbo fan 7 is started to purge the inside of the burner to remove the combustible gas and impurities that may remain in the combustion chamber 1, mixing pipe 9 and other components to prevent explosion during ignition. The post-purge cleaning time is set to 20-30s. After the burner is shut down, the turbo fan 7 continues to run for a period of time to purge the inside of the burner, remove residual smoke and unburned fuel, and protect the equipment from corrosion and damage.

[0050] The safe ignition time includes the direct ignition delay time set to 2s, the flame delay time set to 3s, and the main fire time set to 5s. The direct ignition delay time refers to the time interval from the issuance of the ignition command to the power-on of the electric spark ignition device, which is set to 2s to ensure that the gas and air are evenly mixed before ignition. The flame delay time refers to the time interval from the power-on of the electric spark ignition device to the detection of the flame by the flame monitoring device, which is set to 3s to give the flame enough time to form and stabilize. The main fire time is set to 5s. After the main fire is ignited, a stable combustion time of 5s is maintained to ensure that the main flame is stably established, and then the burner enters the normal operation stage.

[0051] The operator first checks the various interlocking devices on the burner, such as gas pressure interlock, wind pressure interlock, flame monitoring interlock, etc., to ensure that these interlocking devices are correctly installed and functioning properly. Through manual testing or checking the status indicator of the interlocking device, it is confirmed that it is flexible and has no jamming. During the operation of the equipment, once an abnormal situation occurs, the interlocking device can act in time to ensure the safety of the equipment.

[0052] Verify that the fan contact points are flexible and free of jams. Manually rotate the fan impeller to check whether the fan motor starts and stops normally, and whether there are abnormal vibrations and noises when the fan is running. At the same time, check whether the electrical connection of the fan motor is firm and whether the insulation performance is good. Verify whether the gas pressure switch device functions correctly and reliably. By adjusting the gas pressure, observe whether the action of the gas pressure switch meets the set value, and ensure that a signal can be issued in time and corresponding measures can be taken when the gas pressure is abnormal.

[0053] The air monitoring device verifies its functionality, checks whether the air volume monitoring unit is working properly and whether the measurement data is accurate. By introducing a known flow of air into the air intake duct, the measured value of the air volume monitoring unit is compared with the actual value. If the error is within the allowable range, it means that it is functioning normally. To verify the effectiveness of the valve leak detection device, start the valve leak detection device, and perform leak detection on the gas valve group and electric valve. During the detection process, observe whether the leak detection device can accurately detect small gas leaks and send out an alarm signal.

[0054] Check that the fuel, air, and flue gas flow control devices are in the correct position and that the communication is normal. Check whether the initial positions of the air intake control baffle 6, the gas electric control valve 10, and the electric control smoke return check valve 4 meet the requirements, and whether the electric actuator can normally receive and execute the controller's instructions. Send the opening adjustment command through the controller to observe whether the action of the adjustment device is accurate and rapid. At the same time, check whether the communication between the adjustment device and the controller is stable and whether the data transmission is accurate.

[0055] The functionality of the flame detection device must be verified to be correct. Use a method of simulating flame signals, such as using a dedicated flame simulator, to send simulated flame signals to the flame monitoring device to observe whether the flame monitoring device can correctly identify the flame signal and transmit the signal to the controller. At the same time, check whether the installation position of the flame monitoring device is appropriate and whether it can accurately monitor the flame of the burner to ensure that abnormal flame conditions can be discovered in time during ignition and operation.

[0056] When the ignition burner is ignited, the valve leak detection device is first powered on for leak detection, and the ignition gas pipeline and related valves are fully inspected to ensure that there is no gas leakage. Then the electric spark ignition device is automatically powered on to generate high-voltage electric sparks to prepare for ignition. Finally, the ignition gas valve is powered on to introduce the ignition gas into the ignition burner.

[0057] Before starting, the upstream main gas safety shut-off valve is energized to open the valve, while the downstream main gas safety shut-off valve is not energized and closed. After the ignition gas is drawn from the middle of the two main gas shut-off valves, the upstream main gas safety shut-off valve is closed to prevent a large amount of gas from entering the ignition burner, causing gas waste or ignition failure.

[0058] When the main burner is started, the ignition burner is first used to start the rapid ignition. After the ignition flame is confirmed by the flame monitoring device sensor, when entering the next period, the main fire flame is ignited during the process of opening the upstream and downstream main fuel safety shut-off valves. When opening the main fuel safety shut-off valve, it should be done slowly to avoid a sudden increase in gas flow that causes unstable flames. After the main flame is established, it is necessary to confirm that the verification of the main fire safety time has passed, that is, the main flame continues to burn stably within the specified time, otherwise the interlock protection should be used to stop the burner operation and conduct troubleshooting.

[0059] Before the ignition gas valve is powered on, the ignition gas pipeline is pre-purged for 5-10 seconds. The pre-purging gas is compressed air and the pre-purging pressure is 0.1-0.3MPa. During the pre-purging process, the compressed air removes impurities and air in the ignition gas pipeline to create good conditions for ignition. After each ignition failure, add a self-check procedure for each component of the ignition system to check whether the electrode gap of the electric spark ignition device is normal. Generally, the electrode gap is between 2-4 mm to ensure that the ignition energy is sufficient; check the sealing of the ignition gas valve to prevent gas leakage from affecting the ignition effect. Through these self-check procedures, the cause of ignition failure can be quickly and accurately located, and the success rate of subsequent ignition operations can be improved.

[0060] After the burner is ignited and enters the operation stage, the controller monitors the fuel, air volume and nitrogen oxide content at the same time. The fuel monitoring unit measures the gas flow in real time, the air volume monitoring unit accurately monitors the air intake, and the nitrogen oxide monitoring unit continuously detects the nitrogen oxide concentration in the exhaust gas. These monitoring data are collected once every 5 seconds at a certain sampling frequency and transmitted to the controller.

[0061] When the nitrogen oxide content is higher than the set value, the controller increases the opening of the electronically controlled smoke return check valve 4. According to the degree of nitrogen oxide exceeding the standard and the operating conditions of the burner, the controller calculates the appropriate increase in the amount of smoke return through the control algorithm, generally increasing the opening by 5%-15% each time. Increase the amount of recirculated flue gas so that the recirculated flue gas flows into the combustion-supporting air and reduces the oxygen content of the combustion-supporting air. Since oxygen is one of the important factors in the formation of nitrogen oxides, reducing the oxygen content can inhibit the formation of nitrogen oxides. At the same time, the addition of recirculated flue gas can also reduce the flame combustion temperature, because high temperature will promote the formation of nitrogen oxides. By lowering the temperature, the generation of nitrogen oxides can be further reduced, so that the combustion flame remains in a low-nitrogen, low-temperature state, and nitrogen oxide emissions are efficiently controlled.

[0062] When the nitrogen oxide content is lower than the set value and the combustion is unstable, the controller appropriately reduces the opening of the electronically controlled smoke return check valve 4, generally reducing the opening by 3%-10% each time to reduce the impact of the return smoke on the combustion. At the same time, the opening of the air intake adjustment damper 6 and the gas electric control valve 10 are adjusted. According to the specific manifestations of unstable combustion, the controller calculates the appropriate adjustment amount through the built-in algorithm. For the air intake adjustment damper 6, if the unstable combustion is manifested as excessive air, its opening can be appropriately reduced, and the adjustment range each time is between 5°-15°; if there is insufficient air, increase the opening. For the gas electric control valve 10, according to the adjustment of the air volume, the gas flow rate is adjusted accordingly to achieve the best air and fuel ratio, improve combustion stability, and ensure that the burner operates stably with low nitrogen emissions.

[0063] During the entire operation and adjustment process, the smoke return flow rate is strictly controlled to be below 25% of the total smoke volume. The smoke return flow rate and the total smoke flow rate are monitored in real time by flow sensors installed on the smoke return duct and the exhaust gas emission duct, and the controller performs precise control based on the flow data. If the smoke return flow rate is close to or exceeds 25%, even if the nitrogen oxide content does not reach the ideal state, the opening of the electronically controlled smoke return check valve 4 will no longer be increased, but other adjustment methods will be used to control nitrogen oxide emissions to prevent problems such as reduced combustion efficiency and equipment ash accumulation due to excessive smoke return.

[0064] Shutdown steps During controlled shutdown, the burner receives the shutdown command issued by the external physical quantity regulating protection device and enters the shutdown sequence. For example, when the load of the power plant is reduced and the burner is no longer required to run at full load, the upper computer control system sends a shutdown command to the burner according to the load demand. After receiving the command, the burner first gradually reduces the opening of the gas electric control valve 10 to reduce the gas flow, and at the same time adjusts the opening of the air intake regulating damper 6 accordingly to reduce the air intake, so that the combustion intensity gradually weakens. After the gas flow and air flow are reduced to a certain extent, the gas electric control valve 10 and the air intake regulating damper 6 are closed, the fuel and air supply are stopped, and finally the turbine blower 7 is turned off to complete the shutdown process.

[0065] During safety shutdown, if the burner is in the process of starting or in the working state, if there is a power outage, gas interruption or abnormality, and the gas pressure drops sharply below the set value, the burner should be shut down safely immediately. When the gas pressure sensor detects that the gas pressure is lower than the low pressure set value (10kPa), the safety shutdown program is triggered immediately. The controller quickly closes the gas electric control valve 10 and the gas main valve 11 to prevent the continued supply of gas, and stops the operation of the turbine fan 7 to avoid dangerous situations such as incomplete combustion or flashback due to insufficient air volume. During the shutdown process, the system records the shutdown cause and related parameters for subsequent troubleshooting and analysis.

[0066] When the interlock protection is shut down, during the startup and operation process, if there are gas valve leakage alarm signals, flame detection fault signals, gas high and low pressure protection signals, air pressure fault signals, servo motor drive position verification abnormal signals and boiler-related control parameter over-limit signals, the burner should be interlocked and shut down. When the flame monitoring device detects an abnormal flame, it immediately sends a flame detection fault signal to the controller. After receiving the signal, the controller quickly starts the interlock protection shutdown procedure. First, close the gas electric control valve 10 and the gas main valve 11, cut off the gas supply, and then stop the turbine fan 7 to prevent the accident from expanding. At the same time, the system sends out sound and light alarm signals to remind the operator to deal with the fault in time. After the fault is eliminated, the burner needs to be fully inspected and reset before it can be restarted.

[0067] During the pre-purge period, if the burner detects an abnormal air flow, it must be shut down immediately and enter the interlock protection sequence. The controller immediately stops the operation of the turbine fan 7, closes the main gas valve 11 and the gas electric control valve 10 to prevent ignition under fault conditions. After the complete shutdown, the system records the fault information, including the time of the fault, the type of fault, etc. The operator restarts the operation again, and before starting, checks whether the air volume monitoring unit and its related circuits are normal, and whether the fan impeller is blocked by foreign objects. If the fault occurs again, the machine should be shut down immediately and interlocked for protection. After finding out the abnormality and handling the fault, such as replacing the damaged air volume monitoring unit and cleaning the fan impeller, it can be operated again.

[0068] Flame failure during ignition, when the burner has an abnormality during ignition, it should be shut down immediately and then enter the interlock protection sequence. The controller stops the gas supply, closes the ignition gas valve and the main gas safety shut-off valve, and stops the operation of the turbine blower 7. After the shutdown, the operator can re-perform various ignition procedures such as pre-purge and leak detection, and can restart at most once. If there are still abnormal conditions during the restart process, it is necessary to shut down safely and enter the interlock protection until the fault problem is solved. During the troubleshooting process, check whether the various components of the ignition system are working normally, whether the gas pressure meets the requirements, and whether the air and gas are mixed evenly.

[0069] In case of flame failure during operation, when the burner fails to detect flames or loses fire during operation, the flame monitoring device cannot monitor the flame normally, and the program controller should immediately shut down safely and perform interlock protection. The controller quickly closes the gas electric control valve 10 and the main gas valve 11, and stops the operation of the turbine blower 7 to prevent the accumulation of unburned gas and cause safety accidents. At the same time, the system records the operating parameters when the failure occurs, such as gas flow, air flow, temperature, pressure, etc. After the operator analyzes and handles the failure, such as checking whether the flame monitoring device is contaminated or damaged, whether the gas supply is interrupted, and whether there is ash accumulation inside the burner that affects flame propagation, etc., the operation can be restarted. Before restarting, the burner needs to be fully inspected to ensure that the equipment is normal, and then restart the burner according to the startup steps.

Claims

1. An intelligent regulating power plant burner, characterized in that: include: A combustion assembly, comprising a combustion chamber (1), a combustion nozzle assembly (3) and an exhaust gas bin (2), wherein the combustion chamber (1) is provided with a combustion nozzle assembly (3) connected to a mixing pipe (9), and the combustion chamber (1) is connected to the exhaust gas bin (2); A smoke circulation component, comprising a pipeline with an electrically controlled smoke return one-way valve (4) and a smoke return main valve (5), a gas collection chamber (8) and a turbine fan (7), wherein the tail gas chamber (2) is connected to a mixing pipe (9) through the pipeline with the electrically controlled smoke return one-way valve (4) and the smoke return main valve (5), and the tail of the mixing pipe (9) is provided with a turbine fan (7) through the gas collection chamber (8); An air intake regulating assembly, comprising an air intake regulating baffle (6), wherein the air intake regulating baffle (6) is mounted on a side of the turbine fan (7); A gas supply assembly, comprising a gas electric control valve (10), a gas main valve (11), a three-way pipeline (12), an auxiliary fuel tank (13), a gas tank (14) and a tank support frame (15), wherein the mixing pipeline (9) is respectively connected to the auxiliary fuel tank (13) and the gas tank (14) via the three-way pipeline (12) having the gas electric control valve (10) and the gas main valve (11), and the auxiliary fuel tank (13) and the gas tank (14) are installed and fixed via the tank support frame (15); A control system, comprising a controller, an air flow regulating module, a fuel flow regulating module and a smoke flow regulating module, wherein the controller is connected to the air flow regulating module, the fuel flow regulating module and the smoke flow regulating module respectively, the air flow regulating module is connected to an air intake regulating baffle (6), the fuel flow regulating module is connected to a gas electric control valve (10), and the smoke flow regulating module is connected to an electric control smoke return check valve (4); The controller is also connected to a monitoring module, which includes a fuel monitoring unit, an air volume monitoring unit and a nitrogen oxide monitoring unit, wherein the fuel monitoring unit is used to monitor the fuel flow, the air volume monitoring unit is used to monitor the air flow, and the nitrogen oxide monitoring unit is used to monitor the nitrogen oxide content in the flue gas; The controller adjusts the air flow, fuel flow and flue gas flow according to the monitoring data of the fuel monitoring unit, the air volume monitoring unit and the nitrogen oxide monitoring unit by controlling the opening of the air intake regulating damper (6), the opening of the gas electric control valve (10) and the opening of the electric control smoke return check valve (4), so as to make the combustion flame low in nitrogen and low in temperature, and efficiently control the value of nitrogen oxides in the flame combustion, thereby reducing the emission of nitrogen oxides.

2. The intelligent regulating power plant burner according to claim 1 is characterized in that: The gas supply assembly also includes a gas pressure regulating valve, a gas pressure protection device, an automatic safety shut-off valve, a bypass start-up gas valve, a gas valve leak detection device, an ignition transformer, a flame monitoring device and an air pressure monitoring device; The gas pressure regulating valve is used to adjust the gas pressure to ensure a stable air-fuel ratio of the burner; The gas pressure protection device is used to monitor the gas pressure and can provide interlock protection when the gas pressure is lower than the low pressure setting value or exceeds the design value by 1.3 times; The automatic safety shut-off valve closes quickly and automatically when power is lost; The bypass start-up gas valve is used for rapid start and stop, and to adjust the gas flow, and also has a safety cut-off function; The gas valve leakage detection device is used to detect gas leakage of the gas valve group and the electric valve; The ignition transformer is used to ignite the gas; The flame monitoring device is used to monitor the flame during ignition and operation; The air pressure monitoring device is used to monitor the air supply status during the start-up and operation of the burner.

3. The intelligent regulating power plant burner according to claim 1, characterized in that: The control system also includes an automatic controller and an electronic ratio adjustment device; The automatic controller adopts Siemens LMV5X series, which is used to control the ignition program of the burner, the fuel and air ratio, the oxygen amount adjustment, and the blast burner power adjustment; The electronic ratio regulating device is equipped with a servo motor, which is used to adjust the opening of the gas butterfly valve, the air door damper and the auxiliary recirculation flue gas damper on the burner to adjust the air-fuel ratio and ensure sufficient combustion.

4. The intelligent regulating power plant burner according to claim 1, characterized in that: A pressure balancing device is provided between the auxiliary fuel tank (13) and the gas tank (14) in the gas supply assembly. The pressure balancing device is used to ensure that the pressures of the auxiliary fuel tank (13) and the gas tank (14) are stable and balanced during the process of supplying gas to the mixing pipe (9), so as to ensure the stability of the gas supply and avoid unstable combustion or abnormal changes in gas flow due to pressure fluctuations, thereby affecting the combustion effect and nitrogen oxide emission control.

5. The intelligent regulating power plant burner according to claim 1, characterized in that: The air intake regulating baffle (6) in the air intake regulating assembly adopts a segmented adjustable structure, including at least two segments of regulating blades with different areas. The controller can independently control the opening of each segment of the regulating blade according to different operating conditions and regulation requirements, thereby achieving more accurate air intake volume regulation, further optimizing the air and fuel ratio during the combustion process, improving combustion efficiency, and reducing nitrogen oxide generation.

6. A method for adjusting a power plant burner by intelligently adjusting the power plant burner according to claim 1, characterized in that: The following steps are involved: Data setting steps: Set the fuel type to natural gas; set the low pressure switch dial to 10kPa, the high pressure switch dial to 40kPa, the leak detection setting to 5kPa, and the wind pressure switch setting to 20kPa; set the front purge cleaning time to 30s; set the safety ignition time, direct ignition delay time to 2s, flame delay time to 3s, and main fire time to 5s; set the rear purge cleaning time to 20-30s; Startup steps: Confirm that the interlocking device is correctly installed; verify that the fan contact is flexible and has no jamming; verify that the gas pressure switch device functions correctly and reliably; verify the functionality of the air monitoring device; The effectiveness of the valve leakage detection device function; the fuel, air, and flue gas flow control devices are in the correct position and the communication is normal; the functionality of the flame detection device must be verified to be correct; the burner start-up meets other requirements for boiler operation; Ignition steps: ignite the ignition burner, first energize the valve leak detection device for leak detection, then the electric spark ignition device is automatically energized, and finally the ignition gas valve is energized; before starting, the upstream main gas safety shut-off valve is energized first, and the downstream main gas safety shut-off valve is not energized. After the ignition gas is drawn from the middle of the two main gas shut-off valves, the upstream main gas safety shut-off valve is closed; the main burner is started, first start the ignition burner to quickly ignite, and after the ignition flame is confirmed by the flame monitoring device sensor, when entering the next period, ignite the main fire flame in the process of opening the upstream and downstream main fuel safety shut-off valves. After the main flame is established, it is necessary to confirm that the verification of the main fire safety time has passed, otherwise it should be interlocked for protection; Operation adjustment steps: After the burner is ignited, it enters the operation stage. The controller monitors the fuel, air volume and nitrogen oxide content at the same time, and adjusts the opening of the air intake adjustment damper (6), the opening of the gas electric control valve (10) and the opening of the electric control smoke return check valve (4) according to the monitoring data, controls the return smoke to merge into the combustion air to reduce its oxygen content, reduce the flame combustion temperature, make the combustion flame low in nitrogen and low in temperature, and efficiently control the value of flame combustion nitrogen oxides, thereby reducing the emission of nitrogen oxides, wherein the smoke return flow rate is controlled to be less than 25% of the total smoke volume; Shutdown steps: including controlled shutdown, safety shutdown and interlock protection shutdown. In controlled shutdown, the burner receives the shutdown command from the external physical quantity adjustment protection device and enters the shutdown sequence; in safety shutdown, if the burner is in the startup process or working state, if there is a power outage, gas interruption or abnormality, and the gas pressure drops sharply below the set value, the burner should be shut down safely immediately; in interlock protection shutdown, if there is a gas valve leakage alarm signal, flame detection fault signal, gas high and low pressure protection signal, air pressure fault signal, servo motor drive position verification abnormal signal and boiler-related control parameter over-limit signal during the startup and operation process, the burner should be interlocked and shut down; Fault handling steps: If a fault occurs during the pre-purge period and the burner has an abnormal air flow detection, it must be shut down safely and immediately enter the interlock protection sequence. After completely shutting down, it must be restarted. If the fault occurs again, it should be shut down immediately and interlocked for protection. The abnormality must be found and handled before it can be operated again; Flame failure during ignition: If the burner has an abnormality during ignition, it should be shut down immediately and then enter the interlock protection sequence. After shutdown, the pre-purge and various ignition procedures can be re-executed to check for leaks. It can be restarted at most once. If the abnormality still exists during the restart process, it must be shut down safely and enter interlock protection until the fault is resolved. If a flame failure occurs during operation: If the burner fails to operate or loses fire during operation, the flame monitoring device cannot monitor the flame normally. The programmable controller should be shut down safely and interlocked for protection immediately. After analyzing and handling the fault, it can be operated again.

7. The method for adjusting a power plant burner by intelligent adjustment according to claim 6 is characterized in that: In the operation adjustment step, when the nitrogen oxide content is higher than the set value, the controller increases the opening of the electronically controlled smoke return check valve (4), increases the amount of returned smoke, reduces the oxygen content of the combustion-supporting air, reduces the flame combustion temperature, and reduces the generation of nitrogen oxides; when the nitrogen oxide content is lower than the set value and the combustion is unstable, the controller appropriately reduces the opening of the electronically controlled smoke return check valve (4), and simultaneously adjusts the opening of the air intake adjustment damper (6) and the gas electronically controlled valve (10), optimizes the air and fuel ratio, and improves the combustion stability.

8. The method for adjusting a power plant burner by intelligent regulation according to claim 6 is characterized in that: During the ignition step, if the ignition fails, the controller records the ignition failure information, including ignition time, gas pressure, and air pressure parameters, analyzes the cause of the ignition failure, adjusts the ignition parameters, such as ignition delay time and gas flow, and then re-performs the ignition operation. If the ignition fails multiple times, a fault alarm signal is issued to prompt the operator to perform maintenance.

9. The method for adjusting a power plant burner by intelligent regulation according to claim 6, characterized in that: In the operation adjustment step, when it is detected that the fuel flow fluctuation exceeds a preset threshold, the controller quickly and dynamically adjusts the gas electric control valve (10) through the fuel flow adjustment module according to the data fed back by the fuel monitoring unit, so that the fuel flow is stabilized within a normal range, and at the same time, the coordinated adjustment of the air intake adjustment damper (6) and the electric control smoke return check valve (4) is combined to ensure that the combustion flame always maintains a low nitrogen, low temperature and stable state, effectively controls the nitrogen oxide emission, and ensures the safe and efficient operation of the burner.

10. The method for adjusting a power plant burner by intelligent adjustment according to claim 6, characterized in that: In the ignition step, before the ignition gas valve is energized, the ignition gas pipeline is pre-purged, the pre-purging time is 5-10 seconds, the pre-purging gas is compressed air, and the pre-purging pressure is 0.1-0.3MPa. The impurities and air that may exist in the ignition gas pipeline are removed by pre-purging, the ignition success rate is improved, the safety risks in the ignition process are reduced, and the ignition process is ensured to proceed smoothly. After each ignition failure, a self-check procedure for each component of the ignition system is added, including checking the electrode gap of the electric spark ignition device and the sealing of the ignition gas valve, so as to quickly and accurately locate the cause of the ignition failure and improve the success rate of subsequent ignition operations.

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