Blue Flame
Normal Combustion: When the fuel and air mixture in the burner are properly balanced and combustion is complete, the flame typically appears bright blue. At this point, the fuel reacts fully with oxygen, releasing maximum heat and achieving high combustion efficiency. For example, in a natural gas boiler, when the burner parameters are adjusted correctly and the natural gas and air are mixed and burned in the correct ratio, a blue flame is produced.
Yellow Flame
Insufficient Air: A yellow flame typically indicates insufficient air supply during combustion. This results in incomplete combustion of the fuel, producing incomplete combustion products such as soot, which can cause the flame to appear yellow. For example, in an oil-fired boiler, a clogged fuel injector or a malfunction in the air supply system can cause insufficient air flow, resulting in a yellow flame.
Fuel Problems: Impurities or moisture in the fuel can also cause the flame to appear yellow. Impurities or moisture can affect the combustion of the fuel, causing incomplete combustion and resulting in a yellow flame.
Red Flame
Low Combustion Temperature: When the burner's combustion temperature is low, the flame may appear red. This may be due to insufficient fuel supply, excessive air, or a malfunction in the burner itself, resulting in incomplete combustion and insufficient heat release, causing the flame temperature to drop and the color to turn red.
Foreign matter in the furnace: If foreign matter in the furnace affects the normal propagation and combustion of the flame, it may also cause the flame to appear red. Foreign matter may hinder the mixing of fuel and air or interfere with combustion stability, causing abnormal combustion and a change in flame color.
White flame
Excessive air: When the burner is supplied with excessive air, the flame may appear white. Excessive air lowers the combustion temperature and increases the water vapor content in the flame, causing the flame to appear white.
Steam leak: If there is a leak in the boiler's steam system, steam entering the furnace can also cause the flame to appear white. Steam mixes with the hot gases generated by combustion, changing the flame's color and shape.
Observing the color of the boiler burner flame can provide a preliminary assessment of the burner's operating condition and boiler performance. If the flame color is abnormal, prompt inspection and adjustment should be made to ensure safe and stable operation of the boiler.
Blue Flame
Normal Combustion: When the fuel and air mixture in the burner are properly balanced and combustion is complete, the flame typically appears bright blue. At this point, the fuel reacts fully with oxygen, releasing maximum heat and achieving high combustion efficiency. For example, in a natural gas boiler, when the burner parameters are adjusted correctly and the natural gas and air are mixed and burned in the correct ratio, a blue flame is produced.
Yellow Flame
Insufficient Air: A yellow flame typically indicates insufficient air supply during combustion. This results in incomplete combustion of the fuel, producing incomplete combustion products such as soot, which can cause the flame to appear yellow. For example, in an oil-fired boiler, a clogged fuel injector or a malfunction in the air supply system can cause insufficient air flow, resulting in a yellow flame.
Fuel Problems: Impurities or moisture in the fuel can also cause the flame to appear yellow. Impurities or moisture can affect the combustion of the fuel, causing incomplete combustion and resulting in a yellow flame.
Red Flame
Low Combustion Temperature: When the burner's combustion temperature is low, the flame may appear red. This may be due to insufficient fuel supply, excessive air, or a malfunction in the burner itself, resulting in incomplete combustion and insufficient heat release, causing the flame temperature to drop and the color to turn red.
Foreign matter in the furnace: If foreign matter in the furnace affects the normal propagation and combustion of the flame, it may also cause the flame to appear red. Foreign matter may hinder the mixing of fuel and air or interfere with combustion stability, causing abnormal combustion and a change in flame color.
White flame
Excessive air: When the burner is supplied with excessive air, the flame may appear white. Excessive air lowers the combustion temperature and increases the water vapor content in the flame, causing the flame to appear white.
Steam leak: If there is a leak in the boiler's steam system, steam entering the furnace can also cause the flame to appear white. Steam mixes with the hot gases generated by combustion, changing the flame's color and shape.
Observing the color of the boiler burner flame can provide a preliminary assessment of the burner's operating condition and boiler performance. If the flame color is abnormal, prompt inspection and adjustment should be made to ensure safe and stable operation of the boiler.