Cold Aerosol Fire Extinguishing Agent Applied Basic Research

Ejection rate is an important factor for designing the extinguisher and impacting the fire extinguishing ability of super fine powder extinguishing agent (SFPEA). It is studied in this dissertation that the ejection rate of SFPEA influenced by the extinguisher structure, the fluidity of extinguishing agent, the storage pressure and the nozzle size. It is proved that the fluidity of extinguishing agent takes the strongest effect on ejection rate. The extinguisher structure and the storage pressure take stronger effect on it. The nozzle size almost has no effect. It is also studied that the distribution character of SFPEA in the fire-extinguishing room without fire and the influence of a series of different nozzle hole diameter and ejection pressure by systematically measuring the mass distribution of SFPEA in fire-extinguishing room after ejection. The results show that SFPEA make a regular distribution in fire-extinguishing room and the SFPEA distribution is more homogeneous when the extinguisher is equipped with smaller nozzle size (3. 00mm) or higher pressure (1. 2Mpa). At last, it is studied that the fire extinguishing ability of several SFPEA in different particle size and its extinguishing rate with different ejection conditions. It is proved that the fire extinguishing ability of SFPEA improves with decrease of its particle size. The different ejection conditions have different effect on extinguishing rate. SFPEA was most effective for fire extinguishing only in the proper ejection condition.