Application of ultra-fine dry chemicals modified by POTS/OBS for suppressing aviation kerosene pool fire

Zhao, Junchao; Lu, Song; Fu, Yangyang; Shahid, Muhammad; Zhang, Heping

doi:10.1016/j.firesaf.2020.103148

Cited by 19 publications

(10 citation statements)

References 25 publications

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“…Due to the smaller particle size, ABC and BC ultrafine dry powders had total flooding fire extinguishing ability ( Zhao et al., 2020a , 2020b ). That means, after injecting, the powders could fill the entire space and inhibit fires and explosions ( Jiang et al., 2019 ; Yu et al., 2016 ).…”

Section: Resultsmentioning

confidence: 99%

A comparative study on the thermal runaway inhibition of 18650 lithium-ion batteries by different fire extinguishing agents

Zhao

Xue

et al. 2021

iScience

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Summary Safety issue of lithium-ion batteries (LIBs) is always a concern. We have studied the inhabitation on thermal runaway (TR) and propagation of 18,650 LIBs in an enclosed space systematically. LIBs at 70% state of charge are chosen for testing. Four fire extinguishing agents are applied on LIB arrays for 20 s, and the inhibiting effects are different. The cooling efficiency varies with the surface temperatures of LIBs. Water spray has the highest cooling efficiency and inhibits the TR propagation among LIB arrays successfully. Three LIBs undergo TR for the releasing of ABC ultrafine dry powder. BC ultrafine dry powder and Novec 1230 are failed to inhibit the TR propagation. Nevertheless, Novec 1230 shows the best on inhibiting fire occurring and the generation of toxic gas. Generally, this study provides valuable information for the choice of fire extinguishing agents.

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Section: Resultsmentioning

confidence: 99%

A comparative study on the thermal runaway inhibition of 18650 lithium-ion batteries by different fire extinguishing agents

Zhao

Xue

et al. 2021

iScience

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“…Besides, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane and sodium perfluorononyloxybenzenesulfonate were used to modify NaHCO 3 , and the modified NaHCO 3 was poor in the activation index (AI) of oil. 14 Acrylate polymer was also used as fluorocarbon surfactant to reduce the surface energy of ammonium polyphosphate coated with silica and the modified ammonium polyphosphate dry powder fire extinguishing agent had excellent hydrophobic and oleophobic properties. 15 However, the hydrophobic and oleophobic modification method of dry powder fire extinguishing agent was more complicated and cannot meet the production requirements.…”

Section: Introductionmentioning

confidence: 99%

“…However, the modified dry powder fire extinguishing agent was not hydrophobic; it easily absorbed moisture and agglomerated; and it had poor spray and flow properties. Besides, 1 H ,1 H ,2 H ,2 H -perfluorooctyltrimethoxysilane and sodium perfluorononyloxybenzenesulfonate were used to modify NaHCO 3 , and the modified NaHCO 3 was poor in the activation index (AI) of oil . Acrylate polymer was also used as fluorocarbon surfactant to reduce the surface energy of ammonium polyphosphate coated with silica and the modified ammonium polyphosphate dry powder fire extinguishing agent had excellent hydrophobic and oleophobic properties .…”

Section: Introductionmentioning

confidence: 99%

Fluorosilane-Modified Antireflash Sodium Bicarbonate Fire Extinguishing Agent with Advanced Hydrophobic and Oleophobic Properties

Guo

Wang

Zhou

et al. 2022

ACS Appl. Eng. Mater.

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The poor antireflash performance of NaHCO3 dry powder fire extinguishing agent in class B fire is the key problem that restricts its application in large oil fires. In this work, the NaHCO3 was surface modified by sol–gel method to introduce functional fluorosilane structure (named FSi-NaHCO3) and enhance the hydrophobic and oleophobic properties. The water contact angle (WCA) and oil contact angle (OCA) of FSi-NaHCO35 are 147.0° and 144.2°, respectively, which means that FSi-NaHCO35 has advanced hydrophobic and oleophobic properties. The hydrophobic and oleophobic ratio of FSi-NaHCO35 are 92.35% and 91.59%, respectively. Furthermore, FSi-NaHCO35 dry powder fire extinguishing agent can extinguish aviation kerosene and n-heptane oil pool fires in 0.15 and 0.18 s, respectively, which is shorter than that of NaHCO3 dry powder fire extinguishing agent. After the secondary ignition, using FSi-NaHCO35 as dry powder fire extinguishing agent, the fire temperature of the aviation kerosene oil is significantly lower, and the full reburning time of the aviation kerosene oil fire is significantly longer than that of NaHCO3 dry powder fire extinguishing agent, which means FSi-NaHCO35 obviously has antireflash performance in an aviation kerosene oil pool fire.

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“…CF 3 Br (halon 1301), which was a commonly used fire extinguishing agent, was restricted due to its high ozone depletion potential 1,2 . The search for alternatives promoted the examination of the effectiveness of several gasses, liquids, and dry powder agents 3–6 .…”

Section: Introductionmentioning

confidence: 99%

Insights into the particle diameter and base chosen for dry powder fire extinguishing agents

Zhao¹,

Xue²,

et al. 2022

Fire and Materials

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Sodium bicarbonate and potassium bicarbonate are commonly used as the bases of dry powder fire extinguishing agents. However, the choices of particle diameter and base are still not obvious, bringing difficulties to the design of fire extinguishing agents. Through the study on thermal decomposition kinetics, it was found that the smaller the particle size, the faster the decomposition rate of dry powder agents. For instance, if the D90 of sodium bicarbonate is reduced from 46.2 to 1 μm, the decomposition rate triples. As determined by thermal decomposition experiments, the residues after a fire could be bicarbonates, carbonates, and mixtures. The residue solutions' pH shows that carbonates are more alkaline than bicarbonates, and potassium salts are more alkaline than sodium salts. The corrosion tests on four common metals reveal that the residues of potassium bicarbonate after a fire could accelerate the electrochemical corrosion of metal surfaces, especially aluminum alloys. This research identifies the ideal particle diameter and supports the choice of alkali metal salts for the design of dry powder agents.

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Application of ultra-fine dry chemicals modified by POTS/OBS for suppressing aviation kerosene pool fire

Cited by 19 publications

References 25 publications

A comparative study on the thermal runaway inhibition of 18650 lithium-ion batteries by different fire extinguishing agents

A comparative study on the thermal runaway inhibition of 18650 lithium-ion batteries by different fire extinguishing agents

Fluorosilane-Modified Antireflash Sodium Bicarbonate Fire Extinguishing Agent with Advanced Hydrophobic and Oleophobic Properties

Insights into the particle diameter and base chosen for dry powder fire extinguishing agents

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