HANGZHOU NUZHUO TECHNOLOGY GROUP CO.,LTD.

In industrial production, laboratory research and development, food processing, electronic manufacturing and other scenarios, nitrogen is widely used as an inert protective gas, purging gas and preservation gas. The current mainstream methods of nitrogen supply can be divided into two categories: the on-site gas production mode represented by PSA pressure swing adsorption nitrogen generators, and the purchased supply mode represented by liquid nitrogen cylinders (Dewar flasks / steel cylinders). These two modes have fundamental differences in nitrogen production principles, cost structure, purity stability, safety performance and scene adaptability, which directly affect the gas usage efficiency and long-term operating costs of enterprises. This article will conduct a systematic comparative analysis from the core dimensions to provide a decision-making basis for gas selection.

The core principle of PSA (Pressure Swing Adsorption) nitrogen generator is to utilize the difference in adsorption rates of oxygen and nitrogen molecules by carbon molecular sieves to achieve nitrogen-oxygen separation. Its working process is as follows: Compressed air is purified and then enters the adsorption tower. Under pressure, the molecular sieve preferentially adsorbs oxygen molecules, while nitrogen molecules pass through the adsorption tower and are output. When the molecular sieve in the adsorption tower is saturated, it is desorbed under reduced pressure to achieve regeneration. The two towers work alternately to continuously produce nitrogen. The core feature of this mode is “on-site gas production and on-demand supply” – simply by connecting to compressed air and power supply, nitrogen can be continuously produced 24 hours a day without relying on external gas source delivery. It is a distributed, self-sufficient gas supply solution.

The nitrogen gas in the liquid nitrogen cylinder originates from a large-scale deep cryogenic air separation unit: After the air is deeply cooled and liquefied, liquid nitrogen is separated through distillation and then filled into Dewar flasks or high-pressure steel cylinders. It is transported to the usage site through logistics. The core feature of this model is “centralized gas production and off-site storage and transportation” – users do not need to build their own gas production equipment, but the nitrogen supply is completely dependent on external procurement and distribution, belonging to a passive and intermittent gas supply scheme.

The PSA Nitrogen Generator has adjustable purity, suitable for various scenarios, and can be flexibly adjusted according to different requirements. For example, it is applicable to high-demand scenarios such as laser cutting, food preservation, metal heat treatment, injection molding anti-oxidation, electronic welding, laser cutting, and laboratory chromatography analysis.

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Elena Liu 

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