Problems encountered during the use of boiler burners and their solutions

Problems encountered during the use of boiler burners and their solutions
The failure of the burner to function properly can affect the use of the boiler, and there are many reasons why the burner cannot function properly, such as improper gas or air pressure, blockage, and improper installation of the burner. The following is a list of common problems encountered during the use of boiler burners and some solutions. I hope everyone can gain some insights.
1. Insufficient oxygen content
Insufficient oxygen content can cause the burner to shut down. Check the oxygen content in the furnace to confirm that there is excess O2 in the boiler. If there is no excess oxygen content in the furnace, extra care must be taken. If the O2 meter shows excessive oxygen being discharged from the flue, the burner will lack sufficient air due to leakage from the heating furnace.
2. Unable to achieve the specified air flow rate
If the heat value released by the burner is limited due to air volume, the following points should be checked:
(1) The opening of the burner duct baffle is incorrect or not open at all.
(2) If the opening of the burner air duct baffle is incorrect, greater ventilation is required to meet the required air volume requirements. If greater ventilation cannot be obtained, the burner will operate in a state of lack of air.
(3) The ventilation at the bottom of the heating furnace has not reached the correct operating level.
(4) If the flue damper is not in the correct opening, the ventilation level at the bottom of the heating furnace cannot provide the air volume required for normal combustion.
3. The fuel gas pressure cannot reach the curve level
If the fuel gas pressure cannot be consistent with the performance curve of the burner, check the following points:
(1) The composition of fuel gas does not meet the designed fuel gas requirements.
(2) Check the composition of fuel gas according to its design requirements. Properly increasing or decreasing the content of hydrogen or other components will change the calorific value of the fuel, thereby altering the pressure of the fuel gas.
4. Incorrect methods and instruments for measuring the calorific value and fuel gas flow rate of the burner
Check the accuracy of the instruments used to measure the calorific value and fuel gas flow rate of the burner. If the measured calorific value is incorrect, an incorrect operating pressure will be given, but in reality, the pressure meets the requirements.
5. The opening of the air duct baffle of the burner is greater than 50%
Due to the excessive amount of air passing through the burner, the flame is "blown out", making it impossible for the burner to ignite or maintain combustion. At this time, the burner damper should be appropriately closed until the burner is ignited and stabilized. Generally, when the boiler is in a fully operational state and reaches temperature, the problems that arise can be eliminated.
6. The burner air duct baffle is blocked by foreign objects
Check and confirm that there are no foreign objects blocking the air entering the burner, otherwise it will limit the air volume to the design conditions of the burner.
The instrument used to measure the oxygen content in the flue is incorrect and/or the heating furnace is leaking.
If the O2 content reading in the flue is incorrect and the burner is actually operating in a state of lack of air, it can lead to serious consequences. Check the O2 content measuring instrument to ensure it is functioning properly and has been calibrated in the near future. Check that the sampling pipeline does not leak air, and check for any open fire doors or other openings that can allow air to enter the heating furnace (excluding the air inlet of the burner).
7. The burner nozzle and/or extraction port are partially blocked or damaged
If the burner nozzle and/or extraction port are blocked by foreign objects, it will restrict the flow of fuel and make the burner unstable; If the burner nozzle and/or extraction port are damaged, gas will bypass through the mesh of the nozzle or leak from cracks or threads, making the burner unable to ignite or unstable, and even causing serious damage to the burner components, creating a dangerous situation. At this point, the burner nozzle and/or extraction port must be cleaned or replaced.
8. The burner nozzle is not positioned correctly
If the burner nozzle is not correctly positioned, the ignition hole and stabilizing hole cannot be directly aligned with the ignition source and low-pressure stable zone. Correct positioning must be carried out according to the burner drawings and installation instructions.
9. Fuel gas pressure gauge not installed correctly
Confirm that the pressure gauge is installed as close as possible to the fuel gas connection of the burner, and there is no valve between the pressure gauge and the burner. The pressure shown on the burner performance curve is the fuel gas pressure on the burner, and does not include any pipelines, valves, fittings, etc., nor does it include the system.
10. Incorrect drilling of burner nozzle
Check the orifice of the fire nozzle based on the number and size of orifices given in the data sheet. If the orifice expands due to wear after a period of use, it should be replaced.