Comparison Tests Determine the Ratio between in the Constituent the Compound Additive and Experimental Study on Fire Extinguishing of Water Mist with this Multi-Component Additive

A new multi-component additive of water mist is produced through physics process, which can change the spray pattern of water by physical methods and the physical and chemical characteristics of water by chemical methods. Aiming at the main additive material (fluorine surfactant and urea), a laboratory-scale water mist system was built and a series of comparison tests were conducted in this system to determine the optimal ratio between in the constituent the compound additive. Then in order to study the effectiveness of the water mist adding this new multi-component additive in fire suppression, a series of tests were conducted for the typical fire (oil pool fires and wood crib fires). The comparison test results reveal that the optimal ratios of fluorine surfactant and urea are both 6%, and fluorine surfactant improves extinguishing performance by changing the physical properties of water mist and urea improves extinguishing performance by thermal decomposition. The experimental results also reveal that the fire suppression effectiveness of water mist is improved greatly by adding the multi-component additive. Finally, the suppression mechanism is discussed simply so as to find out the relationship between the multi-component additive and suppression effectiveness.