Environmental factors should be based on the principle of not depleting the ozone layer. Use a extinguishing agent with zero ozone depletion potential. Green environmental protection is the theme we advocate today. As everyone knows, because halon fire extinguishing agents have a strong destructive effect on the atmospheric ozone layer, the greenhouse effect brought by it has become a global social problem. Therefore, in the early 1980s, countries took measures to actively implement halon substitutes. Research and development. The ultra-fine dry powder fire extinguishing agent has been tested by the relevant departments to have a zero potential for reducing ozone depletion in the atmosphere and a zero potential for greenhouse effect. It is an ideal fire extinguishing agent to replace halon.
Toxicity: The selection of non-toxic foam fire extinguishing agents is a development trend in the future. It is mainly measured from two aspects. One is the toxicity of the fire extinguishing agent itself and the toxicity of the thermal decomposition products of the fire extinguishing agent at the temperature of the fire site. If the concentration of carbon dioxide is too high, people who fail to evacuate from the protective area during the fire extinguishing process may suffocate to death. The long life span of carbon dioxide generated in the air after fire suppression has a significant impact on the global greenhouse effect. Heptafluoropropane and trifluoromethane fire extinguishing agents generate a large amount of hydrogen fluoride gas under high temperature conditions. After combining with gaseous water, hydrofluoric acid is formed. This is a highly corrosive acid. It is good for skin, leather, paper, glass, precision instruments Has a strong acid etching effect. Ultra-fine dry powder is non-toxic and harmless, non-irritating to human skin, non-corrosive to protective objects, does not decompose, hygroscopic, non-caking under normal conditions, has good fluidity, dispersion and electrical insulation.
Fire extinguishing efficiency: High fire extinguishing efficiency is one of the important factors in selecting a fire extinguishing agent. Among many fire extinguishing agents, there are mainly two ways to extinguish the fire, one is to suffocate the physical way to extinguish the fire by blocking oxygen. The second is the chemical method of making the generated free radicals much smaller than the free radicals by cutting the combustion chain. Although the mixed gas (IG541) performs well in environmental protection, its design volume fraction is 37.5%-42.8%, which is a physical fire extinguishing method. Therefore, the fire extinguishing efficiency is lower than that of halon and haloalkane fire extinguishing systems. Aerosols diffuse much more slowly than gas extinguishants. The fire extinguishing efficiency per unit volume of ultra-fine dry powder is 3--5 times that of halon fire extinguishing agent, 6-10 times that of ordinary dry powder fire extinguishing agent, more than 10 times that of heptafluoropropane, and 15 times that of carbon dioxide.
Engineering cost: The performance and mechanism of various fire extinguishing agents are different. Therefore, the choice of the water-extinguishing agent also determines the cost of the fire extinguishing system. The mixed gas (IG541) fire extinguishing agent is colorless, odorless, non-toxic, does not damage the atmospheric odor, does not have any adverse impact on the environment, is non-conductive, clean during the fire extinguishing process, and leaves no traces of equipment and equipment after the fire extinguishing. However, the fire extinguishing system has strict requirements on the gas proportion of the fire extinguishing agent, storage bottles, pipes, valves, and nozzle storage rooms, as well as the surrounding environment and temperature, and the manufacturing and installation processes of the system equipment are relatively complicated.
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