Cryogenic nitrogen separation:
Nitrogen production by cryogenic air separation is a traditional method of nitrogen production, which has a history of several decades. It is mainly based on air as raw material, after compression, purification, is the use of heat exchange to liquefy air into liquid air. Liquid-air is mainly a mixture of liquid oxygen and liquid nitrogen, using the boiling point of liquid oxygen and liquid nitrogen is different (at 1 atmosphere pressure, the boiling point of the former is -183 ° C, the latter is -196 ° C), through the distillation of liquid-air, so that they are separated to obtain nitrogen. Cryogenic air separation nitrogen machine is more complex, covers a large area, high infrastructure costs, more one-time investment in equipment, high operating costs, slow gas production (12 ~ 24h), high installation requirements, long cycle. Comprehensive equipment, installation and infrastructure factors, equipment below 3500Nm3/h, PSA equipment of the same specification is 20% to 50% lower than cryogenic air separation equipment. The cryogenic air separation nitrogen machine is suitable for large-scale industrial nitrogen production, while the medium and small gauge mold nitrogen is uneconomical.

Membrane air separation nitrogen (hollow fiber membrane separation) :
Using air as raw material, under certain pressure conditions, oxygen and nitrogen gas with different properties in the membrane have different penetration rates to separate oxygen and nitrogen. Compared with other nitrogen machines, it has the advantages of simpler structure, smaller volume, no switching valve, less maintenance, faster gas production (≤3 minutes), convenient capacity increase, etc., it is especially suitable for medium and small nitrogen users with nitrogen purity ≤99.5%, and has the best functional price ratio. When the purity of nitrogen is more than 98%, its price is more than 15% higher than that of the PSA nitrogen maker of the same specification.

Nitrogen production by molecular sieve (PSA or pressure swing adsorption) :
It is very competitive in the nitrogen machine below 3000Nm3/h, and it is more and more welcomed by medium and small nitrogen users, and PSA nitrogen production has become the preferred method for medium and small nitrogen users. Because, with air as the raw material, carbon molecular sieve as the adsorbent, the use of pressure swing adsorption principle, the use of carbon molecular sieve on oxygen and nitrogen selective adsorption and nitrogen separation method, commonly known as PSA nitrogen production. This method is a new nitrogen production technology developed rapidly in the 1970s. Compared with the traditional nitrogen production method, the process is simple, high degree of automation, fast gas production (15 ~ 30 minutes), low energy consumption, product purity can be adjusted in a large range according to the needs of users, easy operation and maintenance, low operating cost, and strong adaptability of the device. Troy New Energy Co., Ltd. uses PSA nitrogen machine, easy to use one-click operation, no personnel on duty!