Traditional extinguishant and technology of fire extinguishing, according to its mechanism could be divided into physical fire-extinguishing two kinds. Physical fire-extinguishing class extinguisher, including water, carbon dioxide, inert gas and foam, etc. This extinguisher is characterized chiefly by physical suffocation extinguishing, among them the way of water, such as flame retardant, besides having foam suffocation burning effect outside, still have cooling effect. This extinguisher is the advantage of foreign environment effect is small, such as water, basic does not affect and environmental pollution. Its inherent defect, fire extinguishing efficiency is low, slow protection zones technical requirements for higher, Chemical suppressants extinguishing of ABC powder, including heat sol, ha dragon, seven fluorine propane, etc. This fire suppressants using cut off the combustion chain mode extinguishing, which is fast speed, fire extinguishing higher efficiency. Its inherent defect is the environmental impact is bigger. If ha dragon of atmospheric ozone has strong extinguishing of damage, seven fluorine propane at the scene of the fire pyrolysis to protect a hydrofluoric acid content and human body has strong acid erosion, it is strong carcinogen.
Dry powder extinguisher is currently alternative ha dragon latest extinguisher, it will chemical fire-fighting and physical fire-extinguishing two fire-extinguishing mechanism combination, absorbed the advantages of traditional extinguisher, overcome its inherent defect, greatly improving the fire rescue effect. The author can ultrafine powder extinguisher function characteristics of the following analysis.

A, superfine powder burning has strong inhibition

With flame combustion is a chain reaction. Fuel molecules in the combustion temperature or the formation of the energy is smooth in oxygen activation, produced under the existence of free radicals or live gene, and by these to have energy of free radicals reaction, maintain the burning spread continued. Superfine powder extinguisher is a kind of air conditioning sol, at with flame contacts, fire-fighting component quickly capture, burning free radicals, make radical is consumed faster than the rate of production, burning free radicals soon exhausted, the chain reaction process is terminated, the fire quickly snuffed out.

Second, the surface combustion (Yin ran) went role

Superfine powder extinguisher can not only effectively extinguish with flame combustion, still can effectively genernal solid material's surface burn. Superfine powder crystal powder and scorching combustion surface contact, in a series of chemical reaction, part of the reactants in solid surface dissolves in the air, and forming a glass shape layer, this layer of glass surface coverage will solid with surrounding the oxygen in air is separated, make burning suffocate.

Third, the covering of thermal isolation and on combustion zone of oxygen dilute effect

Use dry powder extinguisher extinguish the powder, thick cloud mist and flame, can be effectively combined isolation of combustion flame cover surface radiation. Superfine powder extinguisher in flame temperature of anti-rusty under the action of will in a series of catabolic reactions, these catabolic reactions are generally heat-sink reaction, can absorb the flame of part of heat. These catabolic reactions has some not active body such as carbon dioxide, water vapor, etc, to combustion zone of nitrogen is subsequently jet, further diluted by burning zone of oxygen, make burning stop. The effect is super fine powder fire extinguishing chemical way outside the physical extinguishing method.

Four, fire-fighting way is complete

(1) all the submerged way to extinguish fire

Superfine powder particle size is small, efficient extinguisher because light quality, flow performance is good, can in air suspension certain time, also have hasten thermal, reason can realize full submerged extinguish fire. This is the only way to realize the whole submerged gas dry powder extinguisher.

(2) local protection way to extinguish fire

For some open places of the local extinguishing, superfine powder is very effective. Because of ultrafine powder extinguisher and fire at contact, fire-fighting components can rapid burning free radicals, make free radical is consumed faster than production speed, so as to achieve rapid fire fighting.

At the same time there exist two efficient way is to ultrafine powder fire extinguisher a feature, which is now many other extinguisher beyond what the.