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Pufico-China Gas Expert

02/18

2020

Why should the nitrogen generator be maintained? Why does the nitrogen purity of the nitrogen generator decrease?

The principle of pressure adsorption and decompression desorption is an automatic equipment that adsorbs and releases oxygen from the air, thereby separating nitrogen. Carbon molecular sieve is a kind of coal as the main raw material, after grinding, oxidizing, forming, carbonizing and processing through a special hole type treatment process, the surface and the inside of the columnar granular adsorbent with micropores are black, The pore size distribution characteristics of carbon molecular sieve enable it to realize the dynamic separation of oxygen and nitrogen. This pore size distribution allows different gases to diffuse into the pores of the molecular sieve at different rates without repelling any gas in the mixed gas (air). The separation effect of carbon molecular sieve on oxygen and nitrogen is based on the small difference in the dynamic diameter of the two gases. The dynamic diameter of oxygen molecules is small, so there is a faster diffusion rate in the micropores of carbon molecular sieve. The kinetic diameter is larger, so the diffusion rate is slower. The diffusion of water and carbon dioxide in compressed air is not much different from that of oxygen, while the diffusion of argon is slower. The final enrichment from the adsorption tower is a mixture of nitrogen and argon. After long-term use, the micropore diameter of the carbon molecular sieve will change; if the compressed air contains water and oil, the micropore diameter of the carbon molecular sieve will also be affected, thereby affecting the nitrogen production performance and reducing the purity of nitrogen. Therefore, the nitrogen generator needs regular maintenance.

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