On the controlling parameters of the thermal decomposition of inhibiting particles: A theoretical and numerical study

Dounia, Omar; Jaravel, Thomas; Vermorel, Olivier

doi:10.1016/j.combustflame.2022.111991

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Alkali metal compounds such as (NaHCO 3 )s and (Na 2 CO 3 )s are widely used fire extinguishing agents that can be distributed as powders or aqueous solutions [8]. To this end, analytical expressions for the decomposition position of these inhibitory particles are searched to reveal the influence of flame and powder properties on the problem of thermal decomposition.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Identifying the regularities of n-heptane flame inhibition by inorganic compounds

Tsapko,

Likhnyovskyi

et al. 2024

EEJET

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The task related to using inorganic compounds for extinguishing flames is to enable their inhibitory capacity during operation within wide limits. Therefore, the object of the current research was aqueous solutions of inorganic salts, on which the effectiveness of inhibitory properties during interaction with n-heptane flame was established. It has been proven that increasing the mass flow rate of water by 1.5 mg/s reduces the intensity of OH-radicals radiation from 70 % to 30 % and lowers the flame temperature by 90 °C. However, it was found that when potassium salts are given, the intensity of OH-radicals radiation decreases by more than 6 times, potassium chloride and sulfate reduce the intensity of OH-radicals radiation by more than 2.8 times. Among ammonium salts, salts of dihydrogen phosphate and ammonium hydrogen phosphate reduce the relative intensity of radiation of OH radicals by more than 1.3 times. Sodium salts include nitrates and sodium chloride, which reduce the relative radiation intensity of OH radicals by more than 1.6 times. This is manifested, first of all, in the enrichment of the combustible environment with fuel. When determining the flame temperature of flammable liquids, it was established that n-heptane has the most stable and highest flame temperature, which is 1768 °C. When adding inorganic compounds to the flame of n-heptane, nitrate salt, and potassium chloride, the flame temperature increased by less than 20 °C. However, ammonium salts increased the flame temperature to over 140 °C, despite the presence of water. The practical significance is that the results were taken into account during the design and development of extinguishing agents for extinguishing fires. Therefore, there are reasons to assert the possibility of regulating flame extinguishing processes by using inorganic compounds capable of inhibiting active flame radicals

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Identifying the regularities of n-heptane flame inhibition by inorganic compounds

Tsapko,

Likhnyovskyi

et al. 2024

EEJET

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“…It is an effective means to inhibit the ame by adding inorganic alkali metal salts such as sodium salt or potassium salt (Jiang et al 2019;Sridhar Iya et al 1975;Birchall 1970). The inorganic alkali metal salts decompose into M• radicals during burning and react with H• and OH• radicals in gas, terminating the chain reaction of ame generation (Hindiyarti et al 2006;Babushok et al 2017;Shen et al 1991;Omar et al 2022). However, inorganic alkali metal salts are di cult to decompose and easy to convert into smoke in the burning process.…”

Section: Introductionmentioning

confidence: 99%

Chemical modification of nitrocellulose by grafting sodium carboxymethyl

Liu

Ding

et al. 2022

Cellulose

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Introducing deterrents improves the thermal stability of nitrocellulose of propellant surface, but is accompanied with inevitable problems, such as migration, residue, smoke ame, and so on. In this paper, sodium carboxymethyl function groups were chemically grafted to nitrocellulose molecular chains by reaction of denitration and following etheri cation, which provide thermal stability, ame suppression ion without migration. Various structure characterizations were conducted and con rmed a sodium carboxymethyl-nitrocellulose (CMNC) was prepared successfully. The number of sodium carboxymethyl groups linked to nitrocellulose chains was affected by both denitration and etheri cation. The results showed that the thermal stability of CMNC improved with the increase of bearing sodium carboxymethyl groups and was better than that of original NC sample. Meanwhile, the thermal decomposition behaviors and decomposition products of CMNC are similar to that of NC at temperature of the rst DTG peak T 1 and that of CMC at temperatures of the second DTG peak T 2 . This work provided a way for designing gun propellant with progressive burning, anti-migration and ame suppression simultaneously.

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Effect of initial pressure on methane/air deflagrations in the presence of NaHCO3 particles

Shi

Zheng

Zhang

et al. 2022

Fuel

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On the controlling parameters of the thermal decomposition of inhibiting particles: A theoretical and numerical study

Cited by 5 publications

References 24 publications

Identifying the regularities of n-heptane flame inhibition by inorganic compounds

Identifying the regularities of n-heptane flame inhibition by inorganic compounds

Chemical modification of nitrocellulose by grafting sodium carboxymethyl

Effect of initial pressure on methane/air deflagrations in the presence of NaHCO3 particles

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