Evaluating the suppression effectiveness of hybrid nitrogen and water mist with a cup burner coflowing flame

Ni, Xiaomin; Zheng, Zhong; Li, Guochun; Wang, Xishi

doi:10.1002/fam.2966

Cited by 4 publications

(2 citation statements)

References 28 publications

(38 reference statements)

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“…This does coincide with the practical data well known from works [17,18], the authors of which, by the way, also associate the elimination of fire with the inhibition of oxidation in the system "combustible substance-oxidizer", or neutralization of high temperature [19]. However, unlike the results of studies published in [4,9], the data obtained on the effect of the amount of nitrogen on the inhibition of combustion, in particular, on quenching, suggest the following:…”

Section: Discussion Of Results Of the Study On The Elimination Of Sun...supporting

confidence: 86%

“…In study [9], it was noted that the efficiency of extinguishing a pure hybrid fire extinguishing agent consisting of nitrogen and water fog was experimentally studied by the method of a cup burner with methane/air flame. A series of hybrid agents with different weight ratios of nitrogen and water fog (average diameter according to Sauter: 12.6 microns) was tested and compared to nitrogen and water fog, which were used separately.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Establishing patterns of nitrogen application for fire safety of sunflower grain storage facilities

Tsapko

Sokolenko

Vasylyshyn

et al. 2022

EEJET

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The issue of using nitrogen to eliminate fires in granaries is related to ventilating the grain mass with nitrogen while it is necessary to take into consideration the change in gas concentration. Therefore, the object of this research was the value of the minimum concentration of nitrogen to eliminate the combustion of sunflower grain. It has been proven that in the process of thermal destruction of sunflower grain, the composition of gaseous products of thermal destruction of sunflower grain contains more than 70 % of combustible gases. Namely: carbon monoxide, over 51 %; hydrogen, about 5.7 %; and hydrocarbons with a total concentration of 13.72 %, which provide fire hazardous properties of organic material. Therefore, it should be noted that the release of the amount of combustible gases during pyrolysis requires a reduction in the amount of oxygen in the gas-air environment to eliminate fire sites. Obviously, such a mechanism for the decomposition of sunflower grain during pyrolysis is a factor in regulating the extinguishing process, due to which the amount of nitrogen to eliminate combustion increases. Comparison of experimental studies on the composition of gaseous products of thermal destruction of sunflower grain and studies to determine the minimum fire extinguishing concentration of nitrogen, at which combustion was stopped, made it possible to justify the use of nitrogen. Based on the study's results on the elimination with nitrogen of fire sites of sunflower grain, the values of the minimum fire extinguishing concentration were revealed at extinguishing, about 33.7 % by volume. At the same time, terminating the combustion of sunflower grain occurs with a decrease in the concentration of oxygen in the gas-air environment of about 14 %. The practical significance is the fact that the results obtained for determining the minimum fire extinguishing concentration of nitrogen make it possible to establish operating conditions for granaries when eliminating fire sites

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