초록 ▼

Both power and H2 are produced from a gaseous mixture, comprising H2 and CO2, using first and second pressure swing adsorption (PSA) systems in series. The gaseous mixture is fed at super-atmospheric pressure to the first PSA system, which comprises adsorbent that selectively adsorbs CO2 at said pre

Both power and H2 are produced from a gaseous mixture, comprising H2 and CO2, using first and second pressure swing adsorption (PSA) systems in series. The gaseous mixture is fed at super-atmospheric pressure to the first PSA system, which comprises adsorbent that selectively adsorbs CO2 at said pressure, and CO2 is adsorbed, thereby providing an H2-enriched mixture at super-atmospheric pressure. A fuel stream is formed from a portion of the H2-enriched mixture, which is combusted and the combustion effluent expanded to generate power. Another portion of the H2-enriched mixture is sent to the second PSA system, which comprises adsorbent that selectively adsorbs CO2 at super-atmospheric pressure, and CO2 is adsorbed, thereby providing a high purity H2 product. In preferred embodiments, the division of H2-enriched mixture between forming the fuel stream and being fed to the second PSA system is adjustable.

대표청구항 ▼

1. A method for concurrently producing power and H2 from a gaseous mixture comprising H2 and CO2, the method comprising: feeding the gaseous mixture at super-atmospheric pressure to a first pressure swing adsorption (PSA) system comprising adsorbent that selectively adsorbs CO2 at said pressure, and

1. A method for concurrently producing power and H2 from a gaseous mixture comprising H2 and CO2, the method comprising: feeding the gaseous mixture at super-atmospheric pressure to a first pressure swing adsorption (PSA) system comprising adsorbent that selectively adsorbs CO2 at said pressure, and selectively adsorbing CO2 from the gaseous mixture with said adsorbent and at said pressure, thereby obtaining an H2-enriched mixture at super-atmospheric pressure;forming a fuel stream from a portion of the H2-enriched mixture, combusting said fuel stream and expanding the resulting combustion effluent to generate power;feeding another portion of the H2-enriched mixture at super-atmospheric pressure to a second PSA system comprising adsorbent that selectively adsorbs CO2 at said pressure, and selectively adsorbing CO2 from said portion of the H2-enriched mixture with said adsorbent and at said pressure, thereby obtaining an H2 product;desorbing CO2 from the first PSA system, at a pressure lower than said pressure at which CO2 was selectively adsorbed from the gaseous mixture to form a CO2-enriched mixture; anddesorbing CO2 from the second PSA system, at a pressure lower than said pressure at which CO2 was selectively adsorbed from the H2-enriched mixture, to form an H2 and CO2-containing mixture;wherein all or a portion of the H2 and CO2-containing mixture is used as a purge gas for the first PSA system and/or is compressed and recycled to the first PSA system for further separation. 2. The method of claim 1, wherein the division of H2-enriched mixture between forming the fuel stream and being fed to the second PSA system is adjustable, thereby allowing the proportion of the H2-enriched mixture used to form the fuel stream to be increased by reducing the proportion fed to the second PSA system, and vice-versa, without halting the feed of the gaseous mixture to the first PSA system. 3. The method of claim 1, wherein the gaseous mixture further comprises H2S, and the first PSA system comprises adsorbent that selectively adsorbs CO2 and H2S at the super-atmospheric pressure at which the gaseous mixture is fed to the first PSA system, CO2 and H2S being selectively adsorbed from the gaseous mixture with said adsorbent and at said pressure to thereby obtain the H2-enriched mixture. 4. The method of claim 1, wherein the gaseous mixture comprises: about 30 to 75% mole % H2, about 10 to 60% mole % CO2; and about 0 to 2 mole % H2S. 5. The method of claim 1, wherein the gaseous mixture is fed to the first PSA system at a pressure in the range of about 2-7 MPa (20-70 bar) absolute. 6. The method of claim 1, wherein the CO2 recovery in the H2-enriched mixture is at most about 30%, and the H2 recovery in the H2-enriched mixture is at least about 70%. 7. The method of claim 1, wherein the H2-enriched mixture comprises greater than about 90 mole % H2. 8. The method of claim 1, wherein the H2-enriched mixture is obtained at a pressure which is the same or substantially the same as the super-atmospheric pressure at which the gaseous mixture is fed to the first PSA system. 9. The method of claim 1, wherein the H2-enriched mixture fed to the second PSA system is cooled prior to being introduced into the second PSA system. 10. The method of claim 1, wherein the fuel stream is combusted and combustion effluent expanded in a gas turbine. 11. The method of claim 1, wherein the H2-enriched mixture is combined with N2 and/or steam to form the fuel stream. 12. The method of claim 1, wherein the H2 product comprises at least about 99.9 mole % H2. 13. The method of claim 1, wherein the CO2-enriched mixture contains one or more combustible components, and at least a portion of said mixture is combusted in the presence of O2 to produce a CO2 product comprising combustion products of said combustible components. 14. The method of claim 13, wherein a portion of the H2 and CO2-containing mixture is combusted in the presence of O2 to produce a CO2 product comprising combustion products of H2 and any other combustible components present in said mixture. 15. The method of claim 14, wherein the heat from combustion of said CO2-enriched and H2 and CO2-containing mixtures is used to raise the temperature of the fuel stream formed from the H2-enriched mixture, and/or to generate steam that is fed to a steam turbine to generate further power. 16. The method of claim 1, wherein a portion of the H2 and CO2-containing mixture is compressed and recycled to the second PSA system for further separation. 17. The method of claim 1, wherein a portion of the H2 and CO2-containing mixture is combusted, the resulting combustion effluent combined with the expanded combustion effluent obtained from the fuel stream formed from the H2-enriched mixture, and the combined gases used to generate steam in a heat recovery steam generator. 18. The method of claim 1, wherein a portion of the H2 and CO2-containing mixture is compressed and added to the portion of the H2-enriched mixture used to form the fuel stream. 19. Apparatus for producing power and H2 from a gaseous mixture comprising H2 and CO2, the apparatus comprising: a first pressure swing adsorption (PSA) system, comprising adsorbent that selectively adsorbs CO2 at super-atmospheric pressure;a conduit arrangement for feeding at super-atmospheric pressure the gaseous mixture into the first PSA system;a gas turbine for combusting a fuel stream and expanding the resulting combustion effluent to generate power;a second PSA system, comprising adsorbent that selectively adsorbs CO2 at super-atmospheric pressure;a conduit arrangement for withdrawing at super-atmospheric pressure an H2-enriched mixture from the first PSA system, introducing a fuel stream into the gas turbine formed from a portion of said H2-enriched mixture, and introducing another portion of said H2-enriched mixture into the second PSA system;a conduit arrangement for withdrawing an H2 product from the second PSA system;a conduit arrangement for withdrawing a CO2-enriched mixture from the first PSA system at a pressure lower than said pressure at which CO2 was selectively adsorbed from the gaseous mixture;a conduit arrangement for withdrawing an H2 and CO2-containing mixture from the second PSA system at a pressure lower than said pressure at which CO2 was selectively adsorbed from the H2-enriched mixture; anda conduit arrangement (a) for introducing all or a portion of the H2 and CO2-containing mixture into the first PSA system as a purge gas for the first PSA system and/or (b) for introducing all or a portion of the H2 and CO2-containing mixture into a compressor and for recycling said compressed H2 and CO2-containing mixture to the first PSA system for further separation. 20. An apparatus according to claim 19, wherein said conduit arrangement for withdrawing from the first PSA system the H2-enriched mixture, introducing into the gas turbine a fuel stream formed from a portion thereof, and introducing another portion thereof into the second PSA system, includes a valve system for adjustably controlling the division of the H2 enriched stream between the gas turbine and second PSA system. 21. An apparatus according to claim 20, wherein said valve system is adjustable between a setting whereby all the H2 enriched mixture is sent to the gas turbine and a setting whereby all the H2 enriched mixture is sent to the second PSA system.