Working principle and process flow of PSA nitrogen generator

1, Basic knowledge

1. Gas knowledge

Nitrogen, as the most abundant gas in the air, is inexhaustible and inexhaustible. It is colorless, odorless, transparent, belongs to the sub inert gas category, and does not sustain life. High purity nitrogen is often used as a protective gas in places that isolate oxygen or air. The content of nitrogen (N2) in air is 78.084% (the volume composition of various gases in air is: N2: 78.084%, O2: 20.9476%, argon: 0.9364%, CO2: 0.0314%, other gases include H2, CH4, N2O, O3, SO2, NO2, etc., but the content is very small), molecular weight is 28, boiling point: -195.8 ℃, condensation point: -210 ℃.

2. Knowledge of stress

The pressure swing adsorption (PSA) nitrogen production process involves pressure adsorption and atmospheric desorption, and compressed air must be used. The optimal adsorption pressure of the currently used adsorbent - carbon molecular sieve is 0.75~0.9 MPa. The gas in the entire nitrogen production system is under pressure and has impact energy.

2, Working principle of PSA nitrogen production:

CMS pressure swing adsorption nitrogen generator is an automated equipment that uses carbon molecular sieves as adsorbents, and utilizes the principles of pressure adsorption and pressure reduction desorption to adsorb and release oxygen from the air, thereby separating nitrogen gas. Carbon molecular sieve is a cylindrical granular adsorbent made mainly from coal, processed through grinding, oxidation, shaping, carbonization, and special pore processing technology. Its surface and interior are filled with micropores, and it is black in color. The pore distribution is shown in the following figure:

The pore size distribution characteristics of carbon molecular sieves enable them to achieve dynamic separation of O2 and N2. This pore size distribution allows different gases to diffuse into the micropores of the molecular sieve at different rates without repelling any gas in the mixture (air). The separation effect of carbon molecular sieve on O2 and N2 is based on the slight difference in the kinetic diameter of these two gases. The kinetic diameter of O2 molecules is smaller, so they have a faster diffusion rate in the micropores of carbon molecular sieve, while the kinetic diameter of N2 molecules is larger, so the diffusion rate is slower. The diffusion of water and CO2 in compressed air is not much different from that of oxygen, while the diffusion of argon is slower. The final enriched gas from the adsorption tower is a mixture of N2 and Ar.

Suzhou GASPU Gas Technology Co., Ltd. was founded in 2001 in Suzhou Overseas Students Entrepreneurship Park and registered in Suzhou National High Tech Industrial Development Zone. The company has established long-term cooperative relationships with domestic and foreign research and development institutions such as SAES, SEMIGASSYSTEM, BOISTON, AIRTECH, UOP, GARBOTECH, BURKERT, etc., continuously innovating in gas and air purification treatment technologies, and developing leading new technologies and products domestically.

With a group of professional personnel engaged in the research, promotion, and production of pressure swing adsorption technology, and the efforts of all colleagues to explore and adhere to the principle of customer first, GASPU has developed into a professional air separation equipment supplier with a certain scale in China, integrating scientific research and production. It can provide PSA carbon molecular sieve nitrogen production equipment, membrane separation nitrogen production equipment, and ammonia decomposition hydrogen production equipment to a large number of users, Hydrogen purification products, and various gas supply solutions can be provided according to user requirements.

The company has been self-purchasing land in Suzhou High tech Zone since 2003 and owns a professional production base of 8000 square meters for nitrogen generators and ammonia decomposition hydrogen production equipment. The equipment is widely used in industries such as petrochemicals, electronics, pharmaceuticals, food preservation, and new materials, providing overall solutions for industries and fields that require the use of protective atmospheres. Some customers include Ma-steel Hefei, DSM Chemical, BASF Chemical, BP, and CNOOC Zhejiang Wan-Xiang, Jing-Neng Group, Shanghai Electric, China DATANG, State Power Investment Corporation, Shenzhen Foxconn, etc. have stable and safe equipment operation.

Looking forward to GASPU being your better choice!

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