152、analysis of dangerous characteristics of liquid in cryogenic storage tank - doer equipment
classification：forum publishtime：2020-03-20 15:09:42
analysis of dangerous characteristics of liquid in low temperature storage tank
boiling point of liquid in cryogenic storage tank:
boiling point of cryogenic liquid under 101.3kpa pressure: liquid nitrogen is - 196 ℃, liquid oxygen is - 183 ℃ and liquid argon is - 186 ℃. when in contact with human body, it will cause severe frostbite to skin and eyes. when a small amount of low-temperature liquid leaks or leaks inside the pipe valve, it will absorb the heat of the surrounding environment, and the leakage point will quickly form dew and frost, which will freeze in serious cases.
leakage of cryogenic liquid:
in the environment around the cryogenic liquid storage tank, it is easy to form a gas rich area after the leakage and gasification of cryogenic liquid. if the concentration of nitrogen, argon and carbon dioxide is high, it is very easy to cause suffocation injury. in addition, oxygen enrichment injury will also occur when the oxygen concentration is large.
expansibility of cryogenic liquids:
the volume of cryogenic liquid will expand doer to rapid gasification when it receives high heat or a large amount of leakage from the surrounding environment to absorb surrounding energy. at 0 ℃ and 101.3kpa pressure, the gas volume of 1l low-temperature liquid after gasification: 674l nitrogen, 800l oxygen and 780l argon. in a closed container or pipeline, the internal pressure increases doer to the gasification of low-temperature liquid, which is easy to cause overpressure explosion of the container or pipeline.
oxidizability of cryogenic liquids:
oxygen is a strong combustion supporting agent with extremely strong oxidation. liquid oxygen is close to combustibles, which is easy to cause combustion in case of open fire; in contact with combustibles, it is easy to produce detonation doer to vibration, impact, etc; mixed with combustibles, it has potential explosion hazard. liquid oxygen can adhere to clothes and fabrics, which is easy to cause flash combustion and personal injury in case of ignition source.
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