There are two main sources of nitrogen: liquid canned nitrogen, nitrogen generator is used to generate nitrogen (extract nitrogen directly from the total air).

Liquid canned nitrogen (one ton of liquid nitrogen is equivalent to 780m3 of effective nitrogen at room temperature and pressure): Gaseous nitrogen is produced by large-scale nitrogen production equipment, and then treated with ultra-high pressure and ultra-low temperature (usually: 500Mpa, 1800C) to make it Converted into liquid nitrogen; what we use {is inputting nitrogen into the furnace} is gaseous nitrogen, so there must be a gasification process before using liquid nitrogen: decompression, heating, and several curved lines connected to the liquid nitrogen storage tank The outside of the pipeline is full of ice, accompanied by white mist, which is the liquid nitrogen absorbs the temperature around the pipeline during the gasification process.But if it is in the north or in a colder area, in winter, other facilities are needed to assist liquid nitrogen gasification. In addition, the liquid nitrogen in the storage tank needs to be replenished frequently, which also brings trouble and pressure to the procurement and transportation. At the same time, a large amount of liquid nitrogen is used for a long time, and the overall investment is very large.

There are three types of nitrogen generators: membrane separation nitrogen generator, PSA+ purification device nitrogen generator, PSA nitrogen generator:

Membrane separation nitrogen generator: small gas production per unit time (only suitable for supporting a single furnace), and the achievable nitrogen purity is low (99.9%)

PSA+ purification device nitrogen generator (ie "two-step method"): first use PSA to produce low-purity nitrogen (99.9%), and then use "hydrogen deoxygenation" (that is, continuously input hydrogen and burn, and with the oxygen in the low-purity nitrogen The reaction takes place to obtain high-purity nitrogen: H2+202=2H20). This nitrogen production method has a higher failure rate: PSA failure + "hydrogen deoxygenation" failure. The main failure point of "hydrogen deoxygenation": the ignition device, which can not be interrupted and always maintains a stable flow of hydrogen. :::: Oxygen

PSA nitrogen generator (ie "one-step method"): adopts different process technologies to directly generate high-purity nitrogen and charge it into the furnace. Different manufacturers have different technologies. The main differences are as follows: 1.

The purity that can be achieved is very different: 99.9% -99.999%;

2. The failure rate of equipment varies greatly;

3. The difficulty of later maintenance varies greatly. ;

4. The pressure drop is also different (0.1-0.05Mpa);

From the comparison of the economy and convenience of the two nitrogen sources, the nitrogen generators have obvious advantages; the "one-step" PSA nitrogen generator is the first choice.