Ammonium phosphate fire-extinguishing agents are one of the best substitutes for halon in many powder media. Here, 11 micro m\nmedian diameter ammonium phosphate ultrafine dry powder was used as a fire-extinguishing medium. The fire-extinguishing\nperformance of ultrafine powder under different pressures was studied by analyzing fire-extinguishing time, amount of\nextinguishing agent, and temperature during the fire-extinguishing process. The results show that the fire-extinguishing performance\nof the ultrafine powder is improved with increasing injection pressure. Finally, we used FDS software for fire simulation\nto study the influence of injection pressure on the extinguishing agent. The results show that the extinguishing time is shortened\nwith increasing injection pressure. From 0.2 MPa to 1.0 MPa, the extinguishing time decreases from 34 seconds to 4 seconds.
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