| 摘要 |
Method of educing hydrogen from gas mixtures by means of adsorption method PSA in an adsorption installation containing adsorbers filled with solid sorbent or layers of sorbents, operating according to a cyclically repeated schedule including technological operations of adsorption, pressure lowering, sorbent washing and pressure increasing, which are performed by opening cut-off valves according to a specified program, due to which proper gas streams flow in or out of proper adsorbers characterised in that, after the adsorption, the two-stage pressure lowering, cocurrent with respect to the gas flow in the adsorption stage is performed in the adsorber, and the gas from the first stage of cocurrent pressure lowering is used for the first stage counter current pressure increasing in another adsorber, and the gas obtained from the second stage of cocurrent pressure lowering is used for second stage cocurrent pressure increasing in another adsorber, and next, the operation of counter current pressure lowering and counter current sorbent washing in the adsorber with the use of hydrogen obtained during the adsorption stage are successively performed, and received gas streams from such two operations are joined with each other and removed from the installation as the tail gas, and after such operations, the two-stage pressure increasing in the adsorber is performed, successively, the cocurrent one in the second stage and counter current one in the first stage, and final pressure increasing and compensation with respect to the pressure in the adsorption stage is performed by counter current supply to the adsorber of the part of hydrogen obtained during the adsorption stage, and the operations of cocurrent pressure lowering in the adsorber of the first and second stage are coordinated in time with proper operations of the second stage cocurrent pressure increasing and the first stage counter current pressure increasing, both performed in other adsorbers, the operations of counter current sorbent washing with hydrogen and counter current pressure compensation with hydrogen are performed in the installation in an alternate manner during the whole cycle, and adsorption operations performed in consecutive adsorbers are shifted in time by two strokes with respect to each other and the duration of one stroke is 30-90 seconds.
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