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PSA PSA nitrogen principle
Carbon molecular sieve adsorption of oxygen and nitrogen in the air and increases its adsorption capacity also increases with increasing pressure, no significant difference in oxygen and nitrogen equilibrium adsorption capacity under the same pressure. Thus, the mere change in pressure is difficult to complete the effective separation of oxygen and nitrogen. If further consideration adsorption rate can effectively separate oxygen and nitrogen adsorption characteristics. Oxygen molecules diameter smaller than nitrogen molecules, and thus the diffusion rate of several hundred times faster than nitrogen, the speed of the carbon molecular sieve adsorption of oxygen quickly adsorbed about 1 minute more than 90%; only 5% of the amount of nitrogen adsorption left and right, so the adsorption substantially all oxygen, while remaining substantially all nitrogen. Thus, if the adsorption time is controlled within 1 minute, the oxygen and nitrogen can be initially separated, that is, the adsorption and desorption is achieved by the pressure differential adsorption pressure rises, the pressure drop when the desorption. To distinguish between oxygen and nitrogen by both adsorption speed differential is achieved by controlling the adsorption time, the time control is very short, sufficiently adsorbed oxygen, and nitrogen adsorption has not yet had time to stop the adsorption process. Thus PSA Nitrogen should be pressure changes, time should be controlled within 1 minute.
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