Ultrafine Particles Extinguishing Agent Cast And Liquidity

The flow ability of superfine particle extinguishant released from a special equipment was studied. The average particle size of the extinguishant is about 6μm , 90% of which is NH4H2PO4 as main ingredient. A releasing equipment employing bursting principle was designed and prepared. In a 10m~3 closed room, the extinguishant particle concentration distribution was tested by a particle concentration-laser measuring system under the alphlogistic condition, and the effect of releasing condition on particle concentration was also studied. The results indicate that the particle concentration in the room was not uniform, and the particle concentration in the corner is less, 0.3 s after extinguishant was released, the effect of airflow force on flow ability disappeared, and then the extinguishant particle flowed and diffused by gravity and other field forces. 2.5s after extinguishant was released, the particle concentration in each position got to the top. 10s after extinguishant was released, the particle concentration dropped apparently beside the mid position, and the variable of concentration in corners and near ground is more. It was found that drive energy of gas-generating agent and size of extinguishant particle have a great effect on the release of extinguishant. The more the drive energy is, the better the releasing effect is; the less the particle size is, the better the releasing effect is.