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| Transport in Coal Porous Media on Coal Mine Fires |
Karamanov Asqar Narziqul ogli, Miltiqov Zuxriddin Do'smuhammad ogli, Turg'unov Shokhrukh Shavkatovich
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Abstract:
Liquid nitrogen, a safe, highly efficient, clean, easily obtained, and low-temperature refrigerant, has been now widely used in biology, medical treatment, animal husbandry, food, metallurgy, electronics, aerospace and cryogenic industry, and other fields. Liquid nitrogen has the dual role of cooling and inerting; (i) heat absorption of vaporization can make the fuel combustible temperature drop below ignition temperature, and (ii) cryogenic nitrogen after vaporizing expansion could make the oxygen content in the atmosphere significantly reduced. Therefore, liquid nitrogen is a highly efficient fire extinguishing agent. Previous studies showed that liquid nitrogen can rapidly and effectively put out the sodium fire [1], for which water and carbon dioxide extinguishing agents fail to achieve the effect. Liquid nitrogen can also be employed to extinguish isopropanol [2], ethanol, propanol and diesel [3], and other oil pool fires, as well as building fires [4], thus avoiding damage to property caused by water extinguishing agent. However, unlike building or oil pool fire, subsurface fire features a fire source concealed which is difficult to approach or timely detection of fire sources (such as fire areas of goaf). Therefore, it is very difficult to extinguish the fire; causing underground fires may continue for months or even years.
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