Why do industrial hot water boiler burner accessories vibrate during use
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 reach up to 800 ° C~1000 ° C, and the combustion supporting gas should be the high-temperature gas turbine exhaust temperature of 500 ° C. The temperature of the air used for combustion is only 25 ° C~50 ° C, which stimulates the potential of vibration. Why do the burner accessories of industrial hot water boilers vibrate during operation? What are the solutions?
The lower part of the boiler furnace is the combustion zone, and the upper part is connected to the flue. During operation, the furnace is filled with continuously flowing combustion gas, forming an airflow field throughout the furnace space.
The inner side of the furnace wall is affected by the dynamic pressure of the gas flow field inside the furnace, while the outer side is affected by atmospheric pressure. When the gas flow and pressure inside the furnace fluctuate, it will stimulate the vibration of the furnace wall. In actual production, the pressure fluctuation of boiler gas is significant, leading to unstable combustion, significant fluctuations in negative pressure at the furnace top, and frequent changes in pressure difference between the inner and outer sides. Make the boiler wall vibrate. The vibration of the furnace wall caused by combustion dynamics is inevitable. The function of a rigid beam is to protect the furnace and flue from damage under furnace working pressure or detonation conditions, that is, to increase the stiffness of the furnace wall by adding a rigid beam. Insufficient rigidity or installation failure of the rigid beam, which cannot meet the design requirements, will cause serious furnace wall vibration.
Change the natural frequency of the combustion chamber and the frequency of vortices generated by combustion at the periphery of the combustion chamber throat. In order to prevent the low-frequency vibration of the flue gas column caused by flame oscillation, the burner structure and combustion conditions should be improved.
It can change the natural vibration frequency of combustion in the furnace pit, such as renovating double-sided water walls, large-scale exhibitions, horizontal superheaters, etc. Improve the combustion chamber to match the air regulator and bellows structure, such as installing burner stabilizers, air baffles, etc. It is necessary to reasonably design and arrange the position of the flue gas recirculation inlet, adjust the control method, and prevent the occurrence of abnormal phenomena such as flue gas short circuits. So, the reason for the vibration of the burner accessories may be the above reasons.