Fire Extinguishing Effect Of Mixed Agents Of Halon 1301 And Inert Gases

Abstract

Multiplier effect of mixed agents of trifluorobromomethane (halon 1301) and inert gases on flame extinction has been investigated, for the purpose of minimizing the use of halons. The inert gases examined are argon, nitrogen and carbon dioxide. The fire-extinguishing efficiency was determined by flame-extinguishing concentrations for n-heptane measured with a cupburner. An additive-property equation was derived by thermodynamic considerations to predict the fire-extinguishng efficiency of mixed agents and used as a measure of multiplier-effect test. The mixed agents of halon 1301 and inert gases showed multiplier effect. There was the optimized mixing ratios of the most effective agents. Flame-extinction temperatures were calculated for the n-heptane flames with the flameextinguishing concentrations of agents. The temperatures suggested that the chemical effect of halon 1301 was enhanced with decreasing the flame temperature by the addition of inert gases. The flame temperature and the concentration of halon 1301 determined strength of the multiplier effect of halon 1301 and inert gas.

Study of fire–extinguishing efficiency of environmentally friendly binary aerosol-nitrogen mixtures

“…As can be seen from the results of the experiment, the action of BANM on the kinetic and diffusion flame does not lead to its strong and sharp cooling and the maximum reduction in temperature was around 230 о С, but the flame was not suppressed. Thus, the action of BANM probably leads to a decrease in heat formation due to the dilution of the atmosphere with nitrogen and agrees well with the results of the authors [29], where they also indicated the reduction in temperature as a result of the influence of the mixture of chladone and carbon dioxide on the hydrocarbon flame. Further increase in the concentration of aerosol and nitrogen leads first to a sharp decrease in temperature, but it is reduced further for 30-40 seconds from taking the burner to the flame, then it stabilizes.…”

The usage of gas and aerosol powder extinguishing mixtures for protection of incendiary mixtures

“…Аналіз загальних закономірностей процесів інгібування показує, що підвищити ефек-тивність інгібувальних засобів можна знизивши вміст окислювача в горючій суміші або в зоні горіння. Відповідно, робить висновок автор [13], газові флег-матизатори, додатково розбавляють, знижують кон-центрацію кисню в горючій системі і тим самим різко підвищують ефективність вогнегасної дії інгібітора. Автори [14] також вказують, що додавання азоту приводить до зменшення в 2,5 рази вогнегасної кон-центрації хладону 114В2 при гасінні н-гептану.…”

Noise Reduction of an Extinguishing Nozzle Using the Response Surface Method

“…However, halon is considered the main factor in ozone depletion; hence, it was banned by the Montreal protocol. As a result, many studies have been conducted to replace halogen agents, and inert gases such as argon, nitrogen, and carbon dioxide are now used [1][2][3][4]. Figure 1 shows the schematic diagram of the gaseous fire-suppression system, which consists largely of storage, operator, controller, valves, pipe, and nozzle.…”