Liquid nitrogen (often written as LN2), nitrogen is formed at low temperature liquid form. Nitrogen boiling point of -196 ° C, the normal atmospheric pressure if the following will form liquid nitrogen; if pressurized, can be higher temperature to get liquid nitrogen. In industry, liquid nitrogen is derived from air fractionation. First air purification, in the pressurized, cooled environment liquefaction, by the air in the different components of the boiling point to be separated. Nitrogen (78.09% of the volume of air) was first vented (and not liquefied), then 0.93% of argon in the air, and finally 20.95% of the oxygen. Liquid nitrogen consumption of natural evaporation every day and night for the 1--1.25 liters, so Sheng liquid nitrogen container should not be too tight to prevent the explosion. Liquid nitrogen tank explosion may be due to high temperature, impact, squeeze. The explosion will occur if the internal pressure increases or the cylinder strength decreases.
  Liquid nitrogen tank explosion causes:
    1. Force causes:
    (1) high temperature and high pressure liquid nitrogen is made by air compression cooling, gasification can be restored to nitrogen. Per liter of liquid nitrogen gasification, the temperature rose 15 ℃, the volume expansion of about 180 times. When the external temperature and pressure beyond the tank should bear the cooling temperature and pressure will occur when the explosion.
     (2) collision vibration liquid nitrogen container tank has a special shock design, in addition to standing storage, but also in the filling state of transport use. But the liquid nitrogen tank in the violent collision and vibration, will cause insulation layer or other parts of the damage, the external environment will directly affect the gasification, causing an explosion.
    (3) poor ventilation ventilation If the use of liquid nitrogen and storage environment ventilation is not good, will cause indoor nitrogen and nitric oxide gas concentration concentration dispersed, to the explosion limit, which led to the explosion.
    2. Quality factors
    (1) improper selection of liquid nitrogen container tank is generally made of pure aluminum foil and stainless steel hot and cold steel plate production, if the main material specifications and quality does not meet the standard requirements, can not meet the conditions of frozen liquid nitrogen, it is likely explosion occurs.
    (2) insulation difference liquid nitrogen tank from the inside and outside the composition of the gallbladder, the appearance of the inner wrapped around the multi-layer insulation, once the reflective material and insulation material off, it will cause the adjacent reflective material and direct contact with the outer bladder, so that the liquid Nitrogen rapidly swells until an explosion occurs.
    (3) valves, instruments and other accessories old aging, self-pressurized liquid nitrogen tank in the long-term use of the process, if the liquid nitrogen tank valves, instruments and other accessories do not pay attention to regular maintenance and replacement, once these accessories aging, The temperature rises or the liquid nitrogen leaks and explodes.
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