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

中文翻译：

---

不同注射压力下超细粉的灭火效率

磷酸铵灭火剂是许多粉末介质中哈龙的最佳替代品之一。在这里 11μ使用中等直径的磷酸铵铵超细干粉作为灭火介质。通过分析灭火过程中的灭火时间，灭火剂用量和温度，研究了超细粉在不同压力下的灭火性能。结果表明，随着注射压力的增加，超细粉末的灭火性能得到改善。最后，我们使用FDS软件进行火灾模拟，以研究喷射压力对灭火剂的影响。结果表明，随着注射压力的增加，灭火时间缩短。从0.2 MPa降低到1.0 MPa，灭火时间从34秒减少到4秒。