The effects of fire extinguishment with water mist by adding different additives were studied.Tens of chemical substances (including alkali metal salt,dilution agent and surface active agent) were selected as additives due to their different extinct mechanisms.At first the performance of fire extinguishment with single additive was studied,then the effects of the same kinds of chemical substances under the same mass fraction were compared to study their influences on the fire extinguishment factors,including extinct time,fire temperature and oxygen concentration from which the fire extinct mechanism with additives could be concluded.Based on this the experiments were conducted to study the cooperate effect of the complexity of different additives.It indicated the relations between different firefighting mechanisms and different additives were competitive.From a large number of experiments the extinct mechanism with water mist by adding additives was concluded and an optimal compounding additive was selected.
