What are the hazards of liquid in the fuel gas?
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The forum searched for answers and compiled them; I would appreciate it if everyone could help me analyze the reasons behind each one, especially points (1) and (3). Harm: (1) Black smoke is emitted from the chimney; the pressure of the fuel gas at the main burner rises sharply, the temperature inside the furnace increases rapidly, and the temperature at the furnace outlet also rises sharply ； (2) There are viewing windows through which oil droplets can be seen ； (3) Positive pressure in the furnace chamber; fire is spraying out from the viewing window ； (4) Black smoke is emitted; in severe cases, the furnace bottom may be damaged.
Fuel gas is generally composed mainly of C1 and C2 compounds; the presence of liquid in it indicates a higher content of C4 and C5 compounds, which results in a higher calorific value. Incomplete combustion leads to black smoke, while complete combustion raises the temperature inside the furnace, potentially exceeding the heat resistance limit of the furnace’s materials and causing damage to its internal components
What was said upstairs is correct; I’ll add some of my own analysis as well, though it may not be accurate. The liquid in the fuel gas stream is generally light and easy to vaporize. Entering the high-temperature furnace, it is possible to undergo rapid vaporization along with intense combustion. The flame may burst out of the furnace.