S cycle electric power system

Claim 1

A method for generating power which comprises: a) introducing steam, oxygen and coal into a reaction chamber; b) forming a fuel gas in the reaction chamber; c) flowing the fuel gas through a first heat exchanger; d) heating carbon dioxide flowing through the first heat exchanger the carbon dioxide formed in a carbon dioxide source; e) flowing the fuel gas through a second heat exchanger to heat steam flowing through the second heat exchanger, the steam subsequently introduced into the reaction chamber; f) flowing the fuel gas from the second heat exchanger to a first compressor; g) flowing the fuel gas to a first turbine to produce power; h) flowing compressed fuel gas from the first compressor to a first combustor, flowing the carbon dioxide from the first heat exchanger to the first combustor, and flowing oxygen from an oxygen source to the first combustor; i) flowing combustion gases from the first combustor to a first gas turbine to drive the turbine to produce power; j) flowing the expanded fuel gas from the first turbine to a second combustor, flowing oxygen to the second combustor, and flowing the expanded gases from the first gas turbine to the second combustor; k) flowing the combustion gases from the second combustor to a second gas turbine to produce power; l) flowing water through a third heat exchanger to form steam, the steam flowing through the second heat exchanger and then to the reaction chamber; m) flowing water comprising the exhaust from a steam turbine through said third heat exchanger to convert the water flowing therethrough to the steam, the steam turbine producing power; and n) flowing the carbon dioxide from its source to a separation and condensation unit to form liquid carbon dioxide; and o) flowing oxygen formed in the separation and condensation unit through the third heat exchanger and into the second turbine the oxygen expanding through the second turbine, a portion thereof flowing into the reaction chamber and another portion flowing to the second combustor.

Claim 2

A method for generating power which comprises: a) introducing steam, oxygen and coal into a reaction chamber; b) forming a fuel gas in the reaction chamber; c) flowing the fuel gas through a first heat exchanger; d) heating carbon dioxide flowing through the first heat exchanger the carbon dioxide formed in a carbon dioxide source; e) flowing the fuel gas through a second heat exchanger to heat steam flowing through the second heat exchanger, the steam subsequently introduced into the reaction chamber; f) flowing the fuel gas from the second heat exchanger to a first compressor; g) flowing the fuel gas to a first turbine to produce power; h) flowing compressed fuel gas from the first compressor to a first combustor, flowing the carbon dioxide from the first heat exchanger to the first combustor, and flowing oxygen from an oxygen source to the first combustor; i) flowing combustion gases from the first combustor to a first gas turbine to drive the turbine to produce power; j) flowing the expanded fuel gas from the first turbine to a second combustor, flowing oxygen to the second combustor, and flowing the expanded gases from the first gas turbine to the second combustor; k) flowing the combustion gases from the second combustor to a second gas turbine to produce power; l) flowing water through a third heat exchanger to form steam, the steam flowing through the second heat exchanger and then to the reaction chamber; m) flowing water comprising the exhaust from a steam turbine through said third heat exchanger to convert the water flowing therethrough to the steam, the steam turbine producing power; and n) flowing the carbon dioxide from its source to a separation and condensation unit to form liquid carbon dioxide; and o) flowing oxygen formed in the separation and condensation unit through the third heat exchanger and into the second turbine the oxygen expanding through the second turbine, a portion thereof flowing into the reaction chamber and another portion flowing to the second combustor.