Abstract: Multi-agent combined foam fire extinguishing technology is an important development direction to solve the challenges of extinguishing flammable liquid fires, which are characterized by high difficulty and easy reignition. However, efficient and environmentally friendly multi-agent combined fire extinguishing technology still requires further research. In this study, a standard positive-pressure multi-agent foam generating device and compressed air foam extinguishant were employed to conduct 1 m² simulated oil tank fire extinguishing tests. The aim was to investigate the fire extinguishing capability of combined technology utilizing compressed air foam with bromotrifluoropropene (BTP) and perfluorohexanone (1230) for 120# solvent oil as standard fuel. The test results demonstrate that under conditions of a gas-to-liquid ratio of 5：1 and a foam mixture supply intensity of 5 L/(min·m²), compressed air foam can effectively extinguish a 1 m² 120# solvent oil tank fire, with a fire control time of 54 s and a complete extinguishment time of 59 s. No reignition occurred after foam supply cessation. Under conditions of a gas-to-liquid ratio of 3：1 and the same foam mixture supply intensity of 5 L/(min·m²), when 0.17 L/min of BTP was injected through positive-pressure spraying, the BTP-containing compressed air foam achieved a fire control time of only 30 s and an extinguishment time of only 33 s for the 1 m² 120# solvent oil tank fire. When 0.19 L/min of 1230 was injected through positive-pressure spraying, the 1230-containing compressed air foam resulted in a fire control time of 54 s and an extinguishment time of 58 s for the same fire scenario.

Key words: multi-agent combined foam extinguishing agent, efficient and environmentally friendly, BTP, 1230, 120# solvent oil, oil tank fire