Why can nitrogen generators replace traditional methods?

In air, oxygen is an active gas and is quite bulky
.

The remaining gas is trace or inactive
.

But nitrogen is one of the commonly used gases in the laboratory, in the past due to backward technology, laboratories often have to use high-pressure nitrogen cylinders or liquid nitrogen tanks for gas supply, this method has many drawbacks, including: 1.
Frequent ventilation, nitrogen cylinder transportation and replacement trouble; 2.
In the actual experimental operation, there is a large amount of purge work consumption, which will increase the cost; 3.
High-pressure containers, some of which are dangerous, need to be placed in the protective gas cabinet; 4.
If liquid nitrogen leaks, liquid nitrogen is in direct contact with the atmosphere, and the ambient temperature in the atmosphere is much higher than the boiling point of nitrogen, resulting in liquid nitrogen instantly gasifying into atmospheric nitrogen, and the volume expands hundreds of times
.

In such an environment, leaking nitrogen directly dilutes oxygen in the air to less than 1%, causing people near the leak point to suffocate, and excess nitrogen can paralyze nerves
.

The above is the traditional nitrogen production method, and now the use of nitrogen generator as a gas supply equipment, can effectively solve these troubles, the equipment usually has PSA nitrogen production and membrane separation method, the use of detection light cone technology, high sensitivity; Coated auxiliary carrier gas improves detection sensitivity and avoids detection tank pollution; Low temperature atomization and evaporation, simultaneous detection of semi-volatile and non-volatile compounds, but also has good sensitivity to thermally unstable compounds
.

The nitrogen generator has two carbon molecular sieve columns, the pretreated compressed air enters and passes through the carbon molecular sieve column, carbon dioxide, oxygen, water vapor and other impurities are adsorbed by the carbon molecular sieve, only allowing nitrogen to pass through the carbon molecular sieve and enter the internal nitrogen tank
.

After a period of time, the carbon molecular sieve column adsorption saturation, the system will automatically switch to the second carbon molecular sieve column to continue to work, the saturated carbon molecular sieve column after rapid pressure reduction, the adsorption captured oxygen is released into the air, so that it is activated and regenerated
.

The adsorption and purification and regeneration processes of the two carbon molecular sieve columns are carried out alternately, so as to continuously produce clean, dry high-purity nitrogen
.