Abstract: Based on the spill fires test model of rectangular oil tank, a solvent oil flow fire extinguishing test device with adjustable dip angle was designed and built. The effects of slope, leakage flow rate and other factors on spill fires combustion characteristics and AFFF extinguishing performance were studied, which provides the design basis for establishing the extinguishing test method of flammable liquid spill fire. The results show that the steady combustion rate of 120# solvent oil spill fires in 0.6 m rectangular steel oil tank is about 6×10-5 m/s. The parameters of flame front position, steady burning area and steady burning rate increase with increasing of fuel leakage flow. Fire extinguishing time is positively correlated with leakage flow and slope. In different parts of the oil tank, fire extinguishing at the front end is easier, while that at the rear end is the most difficult.

Key words: spill fire, foam fire suppression, slope, leakage