Examination of Extinguishment Method with Extinguishing Powder Packed in a Spherical Ice Capsule

In the study, the extinguishment method with an extinguishing powder packed in the hollow capsule made of ice has been proposed and investigated experimentally. If a capsule can be used to deliver an extinguishing powder, it will be possible to transport the agent to the fire area over a long distance. The ice capsule is formed by using the double rotational axis casting machine. The amount of water of 1.8 cm3 is used to make the capsule which has 20 mm in outer diameter. ABC extinguishing powder is filled into the ice capsule. To clarify the characteristics of the ice capsule extinguishment, the extinguishing experiments of a methane-air diffusion flame have been performed, and also the extinguishing process has been observed with a high-speed camera. The ice capsule drops in free fall from the height of 1.8 m, and the impact velocity onto the metal plate, in which the burner is embedded, is 5.8 m/s. The extinguishment of the flame with the extinguishing powder of 3 g filled into the ice capsule has been succeeded, and the maximum effective range of the extinguishing method is 120 mm distance from the burner center to the dropping location of the ice capsule.