Experiments And Research On New Water Mist Fire Supperssion Systems

With the development of our economy and the improvement of the people's life level, there are many new buildings including subways, large underground parking garages, public culture and sport buildings and ultra high-rise buildings that challenge fire control when providing people for conveniences lives .According to The Montreal Protocol on Substances that Deplete the Ozone Layer, Halons that are used widely for fire control are controlled gradually. It is very urgent to find safe extinguishing reagents replacing Halons. Now, FM-200, carbon dioxide, Intergen, Aerosol and SDE are main substitutes used in our country. This thesis indicates that water mist is a very ideal extinguishing reagent through analysis of economy and performances.Now, many investigations on water mist fire suppression systems are conducted in many developed countries and they have got some achievements. The effect of water mist fire suppression systems depends on the performances of nozzles but most market shares of water mist fire suppression systems application are taken by foreign nozzles at present in our country. Now the government has paid more attention to water mist fire suppression systems and the investigation prospect of water mist fire suppression systems technology is very beautiful in our country. This thesis paper detailedly introduces the definition, origin, fire mechanism and application of water mist fire suppression systems. The experimental research platform for water mist fire suppression systems is erected and the self-design fine water mist nozzles are tested through experimental research method. Experiments test the influences of pressure, height, nozzle aperture and frog momentum on the fire control effect of fine water mist. In the experimental fire field, the fire mechanism of fine water mist is detailedly analyzed.Researches indicate that the increase of the work pressure of fine water mist system can decrease particle size of water droplet of fine water mist and enhance the efficiency of fire-extinguishing. With the increase of the work pressure, the flux increases and the efficiency of fire extinguishing is enhanced. The operating height of fine water mist system significantly influences the efficiency of fire extinguishing of fine water mist and the efficiency of fire extinguishing decrease with the increase ofthe height. The frog momentum of fine water mist has main influence on the efficiency of fire extinguishing. It is hoped that my researches can provide some references to others.