Efficiency of heterogeneous inhibition of active flame centers by fire extinguishing powder particles under non-stationary interaction conditions
The relevance of the work is due to the need to improve the efficiency of powder fire extinguishing systems. The aim of this work is to evaluate the effectiveness of the mechanism of heterogeneous inhibition of active flame centers by particles of fire extinguishing powder under non-stationary conditions of interaction. It was achieved by the method of theoretical modeling. There are obtained theoretical dependences of the reaction rate of heterogeneous inhibition of active flame centers by fire extinguishing powder particles on their dispersed and dynamic characteristics under non-stationary conditions of active particles interaction with the inhibitor surface. The efficiency of heterogeneous inhibition of active flame centers by fire extinguishing powder particles in a non-stationary mode of their interaction was evaluated. Fire fighting with fire extinguishing powder under non-stationary conditions is more effective the smaller the effective size of powder particles, the effective duration of the inhibition reaction and the longer the interaction time of powder particles with active flame centres. It was established that inhibition efficiency depends either on the kinetic parameters of active centers and disperse characteristics of the powder particles or on the ratio of interaction time of powder particles with the active centers as well as the characteristic duration of inhibition reaction. The results obtained allow optimizing the conditions and modes of fire extinguishing powder supply to the combustion zone in order to achieve the maximum effect of fire extinguishing.