Ultrafine powder used in places such as the advantages of cable tunnel - ultra-fine powder extinguishing agent, cable tunnels - Fire Industry

Ultrafine powder used in places such as the advantages of cable tunnel - ultra-fine powder extinguishing agent, cable tunnels - Fire Industry

" Halon "Extinguishing agent has been recognized as the world's best fire-fighting agent, but to the eighties of last century, it was recognized that its destruction of atmospheric ozone has a strong role, has threatened the survival of mankind Environment States have taken measures to phase out halon fire extinguishing agents; under the United Nations Environment Programme, "Montreal Agreement" and the Chinese government approved the implementation of the "China to phase out ozone-depleting substances in the State program" provides our country was December 31, 2005 total to stop the production and use of halon 1211, halon 2010 and 1301 completely stop the production and use; thus Dry powder fire Agent of its economic, efficient fire-fighting performance, and has become the main force in the fire extinguishing agent, widely used by the industry, especially in recent years, some scientific research units and Fire Active dry powder extinguishing agent business of new product development and research, so that new times dry out the family, particularly Ultrafine powder Dry powder fire extinguishing agent on behalf of the family of the current highest level, then the fine powder with the performance of dry powder of ordinary difference mainly reflected in what areas? We may wish to apply two products to compare cable gallery and other places.

1, general characteristics of dry powder extinguishing agent

20 30s, the first U.S. company to develop Ansul sodium bicarbonate based dry powder extinguishing agent material. It consists of a fire-fighting effectiveness and small amounts of inorganic salts Additive After drying, grinding, a mixture of fine solid powder (powder of particle size and distribution of fire effects have great impact) composition.

Dry powder fire extinguishing in accordance with the scope can be divided into three categories:

ABC Category: ABC powder extinguishing agent with ammonium salt as the base material, addition of moisture-proof agent, anti-caking agents, flow promoting agent composition. Can be used for fighting flammable liquid, gas and electric equipment, fire and general fire of solid material. BC categories: to sodium bicarbonate, potassium bicarbonate, potassium chloride, sodium chloride-based material, BC class of fire can be extinguished. Applicable to flammable, combustible liquids, gases and electrically charged equipment initial fire, the fire is not suitable for solid substances. D: base material is a ternary eutectic chloride, applied to the fight against K, Na, Mg and other active metals caused the fire burning. (Class D fires eliminate dry powder manufacturers are now less) paper also without consideration of such dry powder extinguishing agent. Only talk about common ordinary dry powder extinguishing agent.

Dry powder fire extinguishing agent and water, foam, carbon dioxide and other extinguishing agent compared to the efficiency of the fire, fire area, the equivalent cost of three fire-fighting units are far superior to the latter. Benefits include: the rapid fire rate, production process is not complicated, wide temperature range, no special requirements on the environment, easy to use, does not require external power, water. And Halon compared to the other it is non-toxic, no pollution, and safety. Overall dry powder extinguishing agent, is "halon" a good substitute. Dry powder fire extinguishing agent is in its economic, efficient fire-fighting performance, and has become the main force in the fire extinguishing agent.

Dry powder extinguishing agent has some flaws. Start talking about the structure of dry powder extinguishing agent: dry powder fire extinguishing agent mainly by the active component, the hydrophobic component, composed of inert filler. Which hydrophobic ingredients are silicone oil and hydrophobic silica, a wide range of inert filler, mainly from the vibration of fact, agglomeration, to improve the performance of dry powder movement, catalytic polymerization and improve dry silicone oil Foam Agents such as the role of content. Silicone oil and hydrophobic silica powder is composed of a hydrophobic component, component particles around the fire formed around the hydrophobic field was superimposed to keep the powder of hydrophobic, moisture. The ratio of silicone oil and carbon black not white, the production process is not good enough closure to make dry powder extinguishing agent exclusion of bad water, easy to absorb moisture. Dry powder particle size and distribution of fire effects have great impact on size large, ordinary dry powder fire extinguishing agent in the powder over a larger than 0.25mm; the powder in the tube in slow motion, will lead to spray powder is not continuous, full of bad flood, with serious impact on the fire performance; water containing the new version of dry powder fire extinguishing agent is not the test of a water ratio, although other indirect detection of the project limited the dry powder moisture content, but many production manufacturers subject to inspection equipment and time constraints, the test only tests hydrophobic when dry and so easy to test several targets, so the powder will happen after a certain period of slight caking, but also affect its performance.

2, ultrafine powder extinguishing agent characteristics and performance

Relatively traditional in terms of ordinary powder, superfine powder dry powder extinguishing agent is currently the home of the latest products, Ministry of Public Security has issued March 1, 2006 GA578-2005 "ultrafine dry powder extinguishing agent" in Technology Standards, local standards promulgated in Hubei Province "ultrafine dry powder fire extinguishing systems without pipe network design, construction, acceptance criteria," in the clear on the concept of ultra-fine powder: "through pressure, jet, resulting in a fire performance of cold aerosol, the average grain diameter less than 5 m solid powder extinguishing agent. "

"Rain God card fine dry powder dry powder fire extinguishing agent is based on the general development of a new fire extinguishing agent, is currently the first under the new standards through the national fixed fire extinguishing systems and fire-resistant components of Quality Supervision and Inspection Center of Fire agent, and its main component is the use of a new fire-fighting material, completely different from other dry powder extinguishing agent. "The major characteristics of natural moisture in it, has a good loose, diffuse, and good electrical insulation and the resurgence of anti-unique properties, especially effective on deep bit of fire; due process do not need to use silicone oil wrapped moisture, which can be processed to have the conditions micron and below, the fire extinguishing efficiency of dry powder on the basis of general increase of nearly 10 times, can quickly control the fire and extinguished the fire, extinguishing the time in seconds to complete, and less susceptible to fire terrain, temperature and other environmental conditions, ultra-fine dry powder fire extinguishing powder successfully extended to the field of automatic fire. Non-toxic or low toxicity to humans and animals, little impact on the environment. According to state information technology department, is the ultra-fine powder fire extinguishing agent fire extinguishing agent in all the world, "the lowest concentration of fire, extinguishing the most efficient, fastest fire" kind.

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