There is an alternating process of heat and cold sources between the boiler and the burner. The temperature of the hot flue gas in the furnace can be as high as 800°C to 1000°C. The combustion-supporting gas should be a high-temperature gas turbine exhaust with a temperature of 500°C, while the temperature of the air used for combustion is only 25°C to 50°C, which stimulates the potential for vibration. Why do burner accessories vibrate during operation?
The lower part of the furnace of the boiler is the combustion area, and the upper part communicates with the flue. During operation, the furnace is filled with continuously flowing combustion gas, and the entire furnace space forms a gas flow field.
The inner side of the furnace wall is affected by the dynamic pressure of the gas flow field in the furnace, and the outer side is affected by the atmospheric pressure. When the gas flow pressure in the furnace fluctuates, it will excite the furnace wall to vibrate. In the actual production, it is affected by the large fluctuation of the boiler gas pressure, resulting in unstable combustion, large fluctuations in the negative pressure of the furnace, and frequent changes in the pressure difference between the inner and outer sides, resulting in boiler failure. The furnace wall vibrates.
The vibration of the furnace wall caused by combustion dynamics is inevitable. The function of the rigid beam is to protect the furnace and flue from damage under the operating pressure of the furnace or deflagration conditions, that is, to increase the rigidity of the furnace wall by adding rigid beams. Insufficient rigidity of the rigid beam or the failure of the installation to meet the design requirements will cause serious furnace wall vibration.
Change the natural frequency of the burner and the frequency of the vortex generated by combustion at the periphery of the burner throat. In order to prevent the low-frequency vibration of the flue gas column induced by the flame swing, the burner structure and combustion conditions should be improved.
The natural vibration frequency of combustion in the furnace can be changed, such as refitting double-sided water-cooled walls, large screens, and horizontal superheaters. Improve the air regulator and air box structure of the burner accessories, such as installing a stable burner, an air-evening partition, etc. It is necessary to reasonably design and arrange the position of the flue gas recirculation inlet and the adjustment control method to prevent the occurrence of abnormal phenomena such as short circuit of the flue gas. Then, the above reasons may be the cause of the vibration of the burner accessories.
There is an alternating process of heat and cold sources between the boiler and the burner. The temperature of the hot flue gas in the furnace can be as high as 800°C to 1000°C. The combustion-supporting gas should be a high-temperature gas turbine exhaust with a temperature of 500°C, while the temperature of the air used for combustion is only 25°C to 50°C, which stimulates the potential for vibration. Why do burner accessories vibrate during operation?
The lower part of the furnace of the boiler is the combustion area, and the upper part communicates with the flue. During operation, the furnace is filled with continuously flowing combustion gas, and the entire furnace space forms a gas flow field.
The inner side of the furnace wall is affected by the dynamic pressure of the gas flow field in the furnace, and the outer side is affected by the atmospheric pressure. When the gas flow pressure in the furnace fluctuates, it will excite the furnace wall to vibrate. In the actual production, it is affected by the large fluctuation of the boiler gas pressure, resulting in unstable combustion, large fluctuations in the negative pressure of the furnace, and frequent changes in the pressure difference between the inner and outer sides, resulting in boiler failure. The furnace wall vibrates.
The vibration of the furnace wall caused by combustion dynamics is inevitable. The function of the rigid beam is to protect the furnace and flue from damage under the operating pressure of the furnace or deflagration conditions, that is, to increase the rigidity of the furnace wall by adding rigid beams. Insufficient rigidity of the rigid beam or the failure of the installation to meet the design requirements will cause serious furnace wall vibration.
Change the natural frequency of the burner and the frequency of the vortex generated by combustion at the periphery of the burner throat. In order to prevent the low-frequency vibration of the flue gas column induced by the flame swing, the burner structure and combustion conditions should be improved.
The natural vibration frequency of combustion in the furnace can be changed, such as refitting double-sided water-cooled walls, large screens, and horizontal superheaters. Improve the air regulator and air box structure of the burner accessories, such as installing a stable burner, an air-evening partition, etc. It is necessary to reasonably design and arrange the position of the flue gas recirculation inlet and the adjustment control method to prevent the occurrence of abnormal phenomena such as short circuit of the flue gas. Then, the above reasons may be the cause of the vibration of the burner accessories.