Can Liquid Nitrogen Put Out A Fire? Yes. In fact, ordinary nitrogen could, in theory, put out a fire as it would be possible to spray it on fire to cut off the source of oxygen and as nitrogen does not burn, this extinguishes the fire.
According to previous experience, liquid nitrogen can be used to extinguish underground mine fires. Urban underground utility tunnel belongs to the enclosed underground space, in which a certain fire prevention zone is set up inside. In theory, the liquid nitrogen fire extinguishing system is adapted in utility tunnel.
Can liquid nitrogen freeze fire? – UCSB Science Line
Liquid nitrogen can’t freeze fire, but it can put out a fire. The reason liquid nitrogen can put out the fire may be surprising; It’s not because it’s cold, but rather because it smothers the fire, preventing the fire from getting enough oxygen to continue burning. You can’t freeze fire because fire is made mostly of heat and light, which come from tiny glowing hot particles.
So obviously in a small controlled environment liquid nitrogen which has boiled and produced gaseous nitrogen can under some circumstances put out a fire.
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How does liquid nitrogen extinguish a fire?
Either of those would remove one leg of the heat/fuel/oxygen fire triangle. Liquid nitrogen is heavier than air and will initially stay near the ground or sink to lower levels. After the gas warms to the ambient temperature it becomes slightly lighter than air and will rise.
What is the critical heat flux for liquid nitrogen fire extinguishing?
It can be considered that the flame can be extinguished when the heat flux at 0.2 m from the flame is reduced to 0.20 kW/m 2, that is, the critical heat flux for liquid nitrogen fire extinguishing is 0.20 kW/m 2. 4.3.3. Oxygen index
Could liquid nitrogen be used to suppress wildfires?
At Wildfire Today we have written about many out-of-the-box proposals for suppressing wildfires. Now a new method (to me anyway) is being proposed. Kenn Roberts wrote to us from Whitehorse, Yukon, Canada suggesting that liquid nitrogen could be used to help control the bushfires in Australia.
Is nitrogen flammable?
This is good news given the prevalence of nitrogen in the atmosphere, if it could catch fire every time that someone lit a match, the Earth would never stop burning. Thankfully, for all of us, nitrogen isn’t flammable.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher