UDC 614.842.61
The article proposes a methodology for assessing the extinguishing efficiency of powder fire extinguishing compositions. The peculiarity of the approach under consideration is to ensure the reliability and repeatability of the experimental results to determine the minimum extinguishing concentration of a finely dispersed composition in a volume, to assess the extinguishing efficiency when using fire extinguishing powders at different values of the average volume temperature of the gas environment in the room. The applied installation refers to laboratory equipment, in particular, devices used to determine the fire extinguishing physicochemical properties of finely dispersed (powder) compositions in closed volumes (rooms). This installation for determining the fire extinguishing concentration consists of a combustion chamber, a compressor, a powder supply system (pneumatic sprayer), a model combustion site, and a device for recording the average volume temperature. The powder composition sample is fed into the combustion chamber using a device consisting of an electromagnetic control panel with an electromagnetic valve, a composite tube with a powder sample and a membrane. The technical effect of the proposed approach is that the use of an electromagnetic pneumatic distributor eliminates the operator's influence on the experiment, since its response time is the same (no more than 0.1 s). The powder is supplied from the bottom up, which allows the powder particles to be evenly distributed throughout the entire volume of the chamber. The minimum fire-extinguishing concentration of the powder composition can be estimated at different values of the average volume temperature inside the combustion chamber. Based on the experiment, the parameters for conducting the assessment are substantiated and numerically determined
effektivnost' tusheniya, poroshkovye ognetushaschie sostavy, impul'snaya podacha ognetushaschego veschestva
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