| 摘要 |
A pressure swing adsorption apparatus (30) to vary selectively the concentration of at least one constituent of a gaseous mixture by sending a gaseous mixture into an adsorber (62) to generate a particular product gas while delivering to another adsorber (60) both a predetermined portion of the product gas to purge the other adsorber and a selected amount of the product gas, independent of the flow rate and in addition to the predetermined portion, to produce a desired relative concentration of the constituents of the product gas selectable from a range of available relative concentrations. |
