Nitrogen making machine is carbon molecular sieve as adsorbent, using pressure adsorption, step-down desorption principle from the air adsorption and release of oxygen, so as to separate the automatic equipment of nitrogen.
Carbon molecular sieve is a kind of coal as the main raw material, after grinding, oxidation, molding, carbonization and through a special hole processing process and become the surface and interior full of micro hole cylindrical granular adsorbent, is black. The pore size distribution of the carbon molecular sieve allows different gases to diffuse into the pores of the molecular sieve at different rates without repelling any of the gases in the mixture (air). The effect of carbon molecular sieve on the separation of O2 and N2 is based on the small difference in the kinetic diameter of the two gases. The kinetic diameter of O2 molecule is smaller, so the diffusion rate in the micropores of carbon molecular sieve is faster. The kinetic diameter of N2 molecule is large, so the diffusion rate is slow. The diffusion of water and CO2 in compressed air is similar to that of oxygen, while argon diffuses slowly. The final concentration from the adsorption column is a mixture of N2 and Ar.
After long-term use, the pore size of carbon molecular sieve will change; If the compressed air contains water and oil, it will also affect the micropore size of carbon molecular sieve, thus affecting the performance of nitrogen production, resulting in the reduction of nitrogen purity.
Therefore, the nitrogen system, especially the compressed air pretreatment system (air compressor, cold and dry machine, three-stage hePA filter, high efficiency oil removal filter, etc.) needs regular maintenance.
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