A method and apparatus for producing power and hydrogen

摘要

Both power and H 2 are produced from a gaseous mixture, comprising H 2 and CO 2 , using first and second pressure swing adsorption (PSA) systems in series. The gaseous mixture (1) is fed at super-atmospheric pressure to the first PSA system (101) , which comprises adsorbent that selectively adsorbs CO 2 at said pressure, and CO 2 is adsorbed, thereby providing an H 2 -enriched mixture (3) at super-atmospheric pressure. A fuel stream (16) is formed from a portion of the H 2 -enriched mixture, which is combusted and the combustion effluent expanded to generate power. Another portion of the H 2 -enriched mixture is sent to the second PSA system (102), which comprises adsorbent that selectively adsorbs CO 2 at super-atmospheric pressure, and CO 2 is adsorbed, thereby providing a high purity H 2 product (8). In preferred embodiments, the division of H 2 -enriched mixture between forming the fuel stream and being fed to the second PSA system is adjustable.