| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve oxygen enriching efficiency by providing an automatic stop valve between an adsorption bed for adsorbing the nitrogen in supply air and a surge tank for storing an oxygen-enriched gas and intermittently opening and closing the valve during the adsorption stage. SOLUTION: Air is supplied from a compressor to an adsorption bed packed with an adsorbent (e.g. molecular sieve zeoplite 5A) capable of adsorbing nitrogen in preference to oxygen. The gas enriched with oxygen in the bed is transferred to a surge tank through a duct provided with an automatic stop valve and stored. In this case, the automatic stop valve is intermittently opened and closed by a control unit while air is supplied to the bed in the adsorption stage. Consequently, the contact time of nitrogen with the adsorbent is prolonged in the adsorption stage, nitrogen is more efficiently adsorbed, and the adsorption equilibrium as the basic performance of the adsorbent is approached sooner. Accordingly, the amt. of oxygen remaining in the gas phase is increased, and the recovery of the oxygen-enriched gas is enhanced.</p> |
