Effect of ecologically safe gas-aerosol mixtures on the velocity of explosive combustion of n-heptane

Balanyuk, Volodymyr; Ковалишин, В. В.; Kozyar, Nazariy

doi:10.15587/1729-4061.2017.108427

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…In work [7], the effectiveness of the combined impact of the binary mixture of fire-extinguishing aerosol and CO 2 and N 2 gases to reduce the flame rate of the n-heptane-air mixture was substantiated and experimentally proven. Experimentally, it was found that the action of binary mixtures on the n-heptane-air mixture reduces the rate of flame propagation along it by up to 6.5 times compared to the rate of the flame propagation through the stoichiometric mixture.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Reducing the intensity of thermal radiation at the sublayer extinguishing of alcohols by ecologically acceptable aerosols

Balanyuk

Кравченко

Harasymyuk

2021

EEJET

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This paper has theoretically substantiated and experimentally established the intensity of thermal radiation at burning and sublayer extinguishing of alcohols with environmentally acceptable aerosols. An installation has been improved that determines the effectiveness of sublayer extinguishing with fire-extinguishing aerosols; a procedure that has been devised for determining the intensity of thermal radiation implies equipping it with an additional heat flow meter HFM–01 at a distance of 30 and 60 mm. The task to establish the intensity of thermal radiation when burning alcohols and its impact on the process of sublayer extinguishing of alcohols with aerosols has been solved. The dependence of sublayer extinguishing efficiency on thermal radiation implies that the fire extinguishing aerosol completely shields the surface of the combustible liquid against its action. The result of this study has established that the intensity of thermal radiation at a distance of 60 and 30 mm from the surface of an alcohol flame with an area of 234 cm2 ranges from 0.8 to 4.7 kW/m2; the intensity of burning and, accordingly, radiation, maximizes on seconds 30‒40 of burning. It has been found that the intensity of thermal radiation for ethanol decreases with the addition of an aerosol with an intensity of up to 0.2 g/s, and decreases even more at the intensity of supply from 1.2 g/s. With a further increase in the intensity of aerosol supply, the radiation intensity begins to decrease, probably due to a decrease in the rate of combustion. In this case, the flame first decreases in size up to 2 times, and then, after 2‒3 seconds, it goes out. The use of fire-extinguishing aerosol for the sublayer extinguishing of alcohols ensures the effect of several factors that synergize and reduce the intensity of evaporation, burning, and, accordingly, thermal radiation

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Reducing the intensity of thermal radiation at the sublayer extinguishing of alcohols by ecologically acceptable aerosols

Balanyuk

Кравченко

Harasymyuk

2021

EEJET

Self Cite

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“…Виходячи з результатів експериментів можна зазначити, що газоаерозольні суміші з вмістом СО2 є на сьогодні одними з найефективніших вогнегасних агентів для підшарового гасіння, а їхні вогнепригнічувальні якості відповідають умовам сучасного протипожежного захисту від пожеж та вибухів горючих газопароповітряних систем в резервуарах. Це також підтверджують автори робіт [7,8,9], в яких відзначено також високу ефективність таких газоаерозольних бінарних сумішей вогнегасного аерозолю.…”

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Sub-Layer Extinguishing of Alcohols by Binary Mixtures of Fire-Extinguishing Aerosol and Co2

Balanyuk

Kozyar

Кравченко

2020

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Introduction. Now the number of enterprises and technological processes where alcohols and alcohol-containing liquids are used is constantly increasing. Due to the content of carbon, hydrogen and oxygen in the molecule, alcohols have increased flammable properties, namely: high combustion temperature, low lower concentration limit of flame propagation, high evapo-ration rate due to low boiling point and significant explosion pressure. Thus, in order to increase the fire safety of alcohol enterprises, is relevant the search for fire extinguishers that would provide both surface extinguishing and volumetric phlegma-tization of alcohol-air mixtures .The purpose and objectives of the study. The aim of the work is to determine the fire extinguishing factors and the efficiency of sublayer extinguishing by binary mixtures of fire extinguishing aerosol and CO2.Research objectives To establish fire-extinguishing factors of sublayer extinguishing of alcohols by binary mixtures of fire-extinguishing aerosol and CO2. To determine the fire-extinguishing efficiency of sublayer extinguishing of alcohols by binary mixtures of fire-extinguishing aero-sol and CO2.Methods. In the work according to the developed method with the use of metrologically certified equipment and certified measuring instruments, the fire-extinguishing minimum volume concentration of the components of the binary gas-aerosol mixture on the developed installation was determined.6 Пожежна безпека, №36, 2020Results. It was found that the maximum fire-extinguishing intensity of the aerosol formed from aerosol based compound based on sucrose (33%), potassium nitrate KNO3 (67%), is about 6 g / s in the experimental setup. The fire-extinguishing inten-sities of aerosol supply and its binary mixture with CO2 have been experimentally established. It was found that the addition of CO2 to the aerosol reduces the time of emergence of gas aerosol bubbles and quenching to 1.5 times. It was found that the size of the bubbles when adding CO2 is 10 -35% larger than when using CO2 itself.Conclusions. The results of the research showed that binary gas-aerosol mixtures have high fire-extinguishing efficiency with their sublayer supply for extinguishing alcohols and are several times more efficient, cheaper and have several times longer service life compared to traditional fire extinguishers.

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Effect of ecologically safe gas-aerosol mixtures on the velocity of explosive combustion of n-heptane

Cited by 2 publications

References 16 publications

Reducing the intensity of thermal radiation at the sublayer extinguishing of alcohols by ecologically acceptable aerosols

Reducing the intensity of thermal radiation at the sublayer extinguishing of alcohols by ecologically acceptable aerosols

Sub-Layer Extinguishing of Alcohols by Binary Mixtures of Fire-Extinguishing Aerosol and Co2

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