What is the dry powder contained in the dry fire extinguisher?
Superfine extinguishing particles due to large surface area, high activity, can be suspended in the air for several minutes, the formation of relatively stable aerosol, therefore, not only the extinguishing efficiency is high, and the use of methods are completely different from the traditional powder extinguishing agent, which is similar to halon fire extinguishing. For example, KHCO3 aerosol fire extinguishing concentration is only 1301 halon 2% fire extinguishing efficiency is equivalent to that of 50 times, and the sediment is not obvious after the fire, the pollution caused by.KHCO3, NaCl, KCl, little K2SO4, NH4H2PO4, NaHCO3 can be used for the preparation of aerosol fire extinguishing agent of fire aerosol extinguishing agent. The particle size is less than
The fire is the core component of dry powder fire extinguishing agent, can play the role of the fire extinguishing material mainly includes: K2CO3, KHCO3, NaCl, KCl, 2S (NH 4) O 4, N H 4H 2S O N a H C 4, O 3, K4Fe (CN) 6 - 3H2O and Na2CO3, has been at home the production of products: ammonium phosphate, sodium bicarbonate, sodium chloride, potassium chloride powder extinguishing agent. Each type of fire particles have a particle size less than the upper limit, the critical size of particles are on fire extinguishing effect is greater than the critical diameter of the particle extinguishing efficiency decreases sharply, but its momentum, through the air of small particle air dynamics force, forcing small particles followed toward the flame center, but not to the flame by hot air flow blown away, reducing the efficiency of fire. The commonly used powder extinguishing agent particle size between 10~75 m, the particle dispersion is poor, specific surface area is relatively small. Therefore, the quantitative stem The powder has the total surface area is small, the larger single particle mass, sedimentation speed, heat decomposition speed is slow, leading to its ability to capture free radicals is small, so the fire extinguishing ability is restricted to a certain extent limits the scope of use of dry powder fire extinguishing agent powder extinguishing agent. The particle size and the extinguishing efficiency is directly connected the fire was the critical size bigger, better extinguishing effect. Therefore, the preparation of fire in space can be uniformly dispersed, suspension of superfine extinguishing powder, ensure fire extinguishing component particles activity, reduce the unit space amount of extinguishing agent is dry powder fire extinguishing effectiveness is very effective means.
Characteristics of general dry powder fire extinguisherThe ordinary dry powder extinguishing agent is mainly composed of active components, fire extinguishing composition, inert filler composed of hydrophobic, hydrophobic and hydrophobic silicone oil is the main component of white carbon black, inert filler variety, mainly anti vibration, agglomeration, improve the motion performance of dry powder, dry powder, and improve the catalytic polymerization of silicone foam extinguishing agent and so on. This kind of tolerance the ordinary dry powder extinguishing agent at home and abroad has been widely used.
