Local Applications Of Superfine Powder Fire Extinguishing Agent

Superfine powder extinguishing agent is a new solid agent which develops based on the ordinary dry powder extinguishing agent. With the continuous improvement of production process and technology, the application scope and application areas of this fire extinguishing agent are increasing. Therefore, it is great significance for the superfine powder extinguishing agent can improve the performance and standardization utilization that researching on the new application mode of this agent.This paper introduces the research on the superfine powder extinguishing agent for local application, including the development history of superfine powder extinguishing agent, application mode, local application research status and feasibility analysis of local application for the fire extinguishing agent, building the fire model, the test results using local application for fire control and extinguishment and the research on the simulation of actual fire test based on the experiments.Through the establishment of superfine powder extinguishing agent for topical application extinguish oil pan fire model test data show that, super fine powder fire extinguishing agent through a certain spray intensity of local application mode, can in 8-10 s time completion of powder injection and in the 4-6s implementation of fire control and eradication. Through test and calculation of the data can be drawn, superfine powder extinguishing agent fire extinguishing efficiency can be reached 0.018 kg/ m~2?s to 0.027kg/ m~2?s, that is half of the general dry powder extinguishing agent effectiveness about 0.05 kg/ m~2?s. That is to say, for the same fire area and in the same injection time, only need to use general dry powder fire extinguishing agent half quality of superfine powder extinguishing agent can achieve very good fire extinguishing effect. At the same time, for the different fire area of the oil pan fires using superfine dry powder extinguishing agent and general dry powder fire extinguishing agent to do the experiment, through the analysis of the test data, superfine powder extinguishing agent fire extinguishing time always than the ordinary dry powder extinguishing agent fire extinguishing time should be small. That is to say in the same fire, the same fire extinguishing device, superfine dry powder extinguishing agent than ordinary dry powder extinguishing agent can quickly put out the flames.The experiment and data of the partial application of the superfine powder fire extinguishing agent to the shelf fire and its data are given for the application of the fire extinguishing agent to the shelf fire. Through the test data and its calculation results can be concluded that the average agent efficiency of the superfine powder fire extinguishing agent is about kg/ m~2?s. This agent efficiency is smaller than the agent efficiency values that be use to the pain fire。The experiment shows that the superfine dry powder fire extinguishing agent can be applied to the solid shelf fire in a local application.According to a local application mode of actual fire simulation test has good fire extinguishing effect, and with ordinary dry powder extinguishing agent for topical application destroy actual fire model data comparison, superfine powder extinguishing agent can not only effectively put out a large fire and the fire extinguishing time is 2 / 3 of the ordinary dry powder extinguishing agent, the application amount of fire extinguishing agent is about 1 / 2 of the general dry powder fire extinguishing agent. And carbon dioxide gas fire extinguishing agent compared, super fine powder fire extinguishing agent, although the in the fire time and fire extinguishing agent does not have a prominent advantages, but because of its low cost, still can as a large fire extinguishing chemical fungicide.Superfine powder extinguishing agent in a local application mode use in class D fire fighting studied respectively oil immersed magnesium chips, metal sodium, aluminium ethide and lithium metal four metals fire. Experiments were carried out by using the same type of fire extinguishing agent to different spray quantities. Through the test data analysis in powder use volume reached more than 12 kg can put out the fire that be caused by 16.2kg dry magnesium chips and 1.8kg cutting oil mixed oil magnesium chips, when the amount reaches 20 kg with fire and anti reflash ideal effect. For the metal sodium fire, used to 10 kg of fire extinguishing agent can achieve the effect of effective control of the fire, and when the use of volume reached 20 kg can very good extinguished and the resurgence of the fire control. In useing to extinguish aluminium ethide fire, when the amount reaches 7.9kg can effectively extinguish the fire. For lithium metal fire test proved that the superfine powder extinguishing agent for topical application to this type of fire can realize put out the fire and prevent the resurgence of the target, especially in the amount of extinguishing agent reached 8.0kg were easy to extinguish fire.Building of the test model, accumulation of the test data and drawing of the test conclusion can widen the use field of superfine powder extinguishing agent, can enhance the performance requirements of superfine powder extinguishing agent. Then at the time of the fire, it will be better to put out the fire and will make contribution to protect life and property safety.The super fine powder fire extinguishing agent for topical application experimental study first demonstrates the extinguishing agent products can be to topically applied to fire fighting; secondly the test data also shows the superfine dry powder extinguishing agent for topical application fire has good fire extinguishing effect and the extinguishing efficiency. The present study can provide theoretical and data support to local application of superfine powder extinguishing agent for fire extinguishing.