Switching fuels on a dual-fuel boiler burner (e.g., between natural gas and light/heavy oil) generally involves four core steps: shutdown and depressurization, shutting off the current fuel system, activating the new fuel system, and re-ignition/commissioning. While procedures vary slightly by brand, the specific steps are as follows:
1. Shutdown and Depressurization: Gradually reduce the boiler load and close the main valve for the fuel currently in use. The burner automatically purges the furnace to clear residual exhaust gases before the burner system shuts down.
2. Fuel Line Switching: When switching from gas to oil: close the manual gas master valve, open the fuel supply and return valves, and verify that oil pressure and temperature (heavy oil requires preheating) are within normal ranges. When switching from oil to gas: cut off the fuel supply, purge the fuel nozzle (to prevent coking from residual oil), then slowly open the gas master valve and confirm the gas pressure is within the normal range.
3. Control Panel and Program Settings: Use the boiler control cabinet or touchscreen to switch the operating mode from "gas" to "oil" (or vice versa). Verify that the linkage curves for the air damper and fuel/gas valves have correctly switched to the program corresponding to the new fuel.
4. Re-ignition and Testing: Restart the burner and observe the ignition electrode sparking and flame monitoring status. Check the flame combustion characteristics, flue gas temperature, and oxygen content to ensure combustion is stable and complete.
Switching fuels on a dual-fuel boiler burner (e.g., between natural gas and light/heavy oil) generally involves four core steps: shutdown and depressurization, shutting off the current fuel system, activating the new fuel system, and re-ignition/commissioning. While procedures vary slightly by brand, the specific steps are as follows:
1. Shutdown and Depressurization: Gradually reduce the boiler load and close the main valve for the fuel currently in use. The burner automatically purges the furnace to clear residual exhaust gases before the burner system shuts down.
2. Fuel Line Switching: When switching from gas to oil: close the manual gas master valve, open the fuel supply and return valves, and verify that oil pressure and temperature (heavy oil requires preheating) are within normal ranges. When switching from oil to gas: cut off the fuel supply, purge the fuel nozzle (to prevent coking from residual oil), then slowly open the gas master valve and confirm the gas pressure is within the normal range.
3. Control Panel and Program Settings: Use the boiler control cabinet or touchscreen to switch the operating mode from "gas" to "oil" (or vice versa). Verify that the linkage curves for the air damper and fuel/gas valves have correctly switched to the program corresponding to the new fuel.
4. Re-ignition and Testing: Restart the burner and observe the ignition electrode sparking and flame monitoring status. Check the flame combustion characteristics, flue gas temperature, and oxygen content to ensure combustion is stable and complete.