What to do if the furnace shuts down frequently after switching its fuel gas to natural gas
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The company’s heating furnaces used to burn gas with a heavy composition, which worked well; now they are switching to natural gas, which has a lighter composition. Some burners experience flame failure, and in severe cases, the flames go out entirely. The company’s furnace is a vertical furnace with three burners; each burner consists of a main burner and an auxiliary burner. The auxiliary burner has four nozzles surrounding the main burner, and the nozzle that loses heat is the one located at the center of the furnace. No matter how it’s adjusted now, the furnace doesn’t burn as well as it used to. Why is it difficult to burn natural gas in a burner designed for burning LPG? How should the furnace be modified now?
It is recommended to contact the original furnace manufacturer and provide the composition of the current fuel gas, so that they can determine whether the burner meets the requirements
Find a furnace manufacturer and contact them to report the issue with the burner; make sure to pay attention to the burner’s model, as the burner models of reputable manufacturers are registered with the special inspection agency.
When there are significant changes in the properties of the fuel, the corresponding burner needs to be modified!
The calorific values of gas and natural gas are different; therefore, more natural gas is required compared to gas, and the pressure inside the furnace is also higher with natural gas. To maintain the same furnace pressure will result in flameout. Personally, one could increase the furnace pressure to see if the flame still goes out. If the fire still goes out, contact the furnace manufacturer to replace the burner
Look for burner manufacturers to determine the suitable range of fuel and pressure for the burners, as well as their operational flexibility. If the pressure of natural gas is high and the burner loses ignition, you can ask the manufacturer to check the diameter of the nozzle to see if it can be slightly increased. If there is really no other option, the burner must be modified or replaced.
Then don’t change it; the enthalpy value of natural gas is also low
The burner nozzles must be changed, as the composition of gas differs from that of natural gas.