There are many types of extinguishing agents equipped by firefighters, and there are more than ten varieties in five categories. The use must be correctly selected according to the nature, state, burning time, wind direction and wind force of the fire site, and the strength of the supply must be ensured in order to give full play to the effectiveness of the fire extinguishing agent and avoid backfire results and losses caused by blind use of the fire extinguishing agent. No matter which fire extinguishing agent we use, we should consider whether it meets the following principles, namely environmental factors, fire extinguishing efficiency, and project cost.
Fire extinguishing agent manufacturers stated that environmental factors extinguishing agents should be based on the principle of not depleting the atmospheric ozone layer. Use an extinguishing agent with zero ozone depletion potential. Today's green environmental protection is the theme we advocate.
High fire extinguishing efficiency is one of the important factors in choosing fire extinguishing agent. Among many fire extinguishing agents, there are mainly two ways to extinguish fires. One is the physical method of suffocating fire by isolating oxygen. The second is the chemical method of cutting the combustion chain so that the generated free radicals are far smaller than the burning free radicals. Although the mixed gas 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 halon fire extinguishing systems. The diffusion rate of aerosols is much slower than that of gas fire extinguishing agents. The fire extinguishing efficiency per unit volume of 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.
Fire extinguishing agent manufacturers say that the performance and extinguishing mechanism of various extinguishing agents are different. To determine the system that needs to use fire-fighting foam liquid, is the water-based system or the oil-based system. Such as the fermentation industry, it is necessary to use oily fire-fighting foam liquid, such as polyether modified silicon or polyether. Water-based paint industry will need water-based fire-fighting foam liquid, silicone fire-fighting foam liquid.