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In one embodiment, a power system comprises: a first compressor unit, a syngas generator in fluid communication with a fuel stream and the first compressor unit, a syngas expander unit configured to directly receive the first syngas stream from the syngas generator, a first steam generator, a water

In one embodiment, a power system comprises: a first compressor unit, a syngas generator in fluid communication with a fuel stream and the first compressor unit, a syngas expander unit configured to directly receive the first syngas stream from the syngas generator, a first steam generator, a water gas shift reactor, and a carbon dioxide removal unit. The first compressor unit is configured to compress an air stream and form a first pressurized stream, while the syngas generator is configured to generate a first syngas stream. The syngas expander is configured to reduce the pressure of the first syngas stream. The first steam generator is configured to cool the second syngas stream. The carbon dioxide removal unit configured to remove carbon dioxide from the converted syngas stream.

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What is claimed is: 1. A power system, comprising: a first compressor unit configured to compress an air stream and form a first pressurized stream; a syngas generator in fluid communication with a fuel stream and the first compressor unit and configured to generate a first syngas stream; a syngas

What is claimed is: 1. A power system, comprising: a first compressor unit configured to compress an air stream and form a first pressurized stream; a syngas generator in fluid communication with a fuel stream and the first compressor unit and configured to generate a first syngas stream; a syngas expander unit configured to directly receive the first syngas stream from the syngas generator and to reduce a pressure of the first syngas stream to form a second syngas stream; a first steam generator configured to cool the second syngas stream to a cooled syngas stream; a water gas shift reactor configured to convert carbon monoxide in the cooled syngas stream to carbon dioxide and to form a converted syngas stream; a carbon dioxide removal unit configured to remove carbon dioxide from the converted syngas stream and to form a carbon dioxide stream and a hydrogen stream; and a gas turbine unit configured for receiving the hydrogen stream and for generating power. 2. The power system of claim 1, further comprising a carbon dioxide compressor unit configured to compress the carbon dioxide stream and form a carbon dioxide product stream. 3. The power system of claim 2, wherein the carbon dioxide compressor unit and the syngas expander unit are mechanically connected to a common shaft. 4. The power system of claim 1, wherein the first compressor unit further comprises: a first compressor configured to compress the air stream to produce a first compressed air stream; a first heat exchanger configured to cool the first compressed air stream to a cooled air stream; a cooler configured to further cool the cooled air stream to a cooler air stream; and a second compressor unit configured to compress the cooler air stream to a second compressed air stream, wherein second compressor outlet is in fluid communication with the first heat exchanger that is configured to heat the second compressed air stream and to form the first pressurized stream. 5. The power system of claim 4, wherein the second compressor unit is mechanically connected to the common shaft. 6. The power system of claim 1, further comprising a saturator located upstream of the gas turbine unit, and configured to introduce water vapor to the hydrogen stream. 7. The power system of claim 6, further comprising a heat recovery unit located downstream of the saturator and upstream of the gas turbine unit, and configured to heat the hydrogen stream with heat from the water gas shift reactor. 8. The power system of claim 6, wherein the saturator is in thermal communication with a component selected from the group consisting of a cooler, a carbon dioxide compressor unit, a second compressor unit, and combinations comprising at least one of the foregoing components. 9. The power system of claim 1, further comprising a quench unit located upstream of the water gas shift reactor and configured to introduce water to the cooled syngas stream. 10. The power system of claim 1, further comprising a saturator located upstream of the syngas generator and configured to saturate the first pressurized stream with water vapor. 11. The power system of claim 10, further comprising a carbon dioxide compressor unit configured to compress the carbon dioxide stream and form a carbon dioxide product stream. 12. The power system of claim 11, wherein the carbon dioxide compressor unit and the syngas expander unit are mechanically connected to a common shaft. 13. The power system of claim 10, wherein the first compressor unit further comprises: a first compressor configured to compress the air stream to produce a first compressed air stream; a first heat exchanger configured to cool the first compressed air stream to a cooled air stream; a cooler configured to further cool the cooled air stream to a cooler air stream; and a second compressor configured to compress the cooler air stream to the first pressurized stream. 14. The power system of claim 13, wherein the second compressor unit is mechanically connected to the common shaft. 15. A method for operating a power system, comprising: compressing an air stream to form a first pressurized stream; forming a first syngas stream by reacting the first pressurized stream and a fuel stream; introducing the first syngas stream directly to a syngas expander; generating first power by expanding the first syngas stream to form a second syngas stream; generating steam and cooling the second syngas stream to a cooled syngas stream; converting carbon monoxide in the cooled syngas stream to carbon dioxide and forming a converted syngas stream; removing carbon dioxide from the converted syngas stream and forming a carbon dioxide stream and a hydrogen stream; and introducing the hydrogen stream to a gas turbine unit and generating second power. 16. The method claim 15, further comprising compressing the carbon dioxide stream with a carbon dioxide compressor unit and forming a carbon dioxide product stream. 17. The method of claim 16, operating the carbon dioxide compressor unit with the first power. 18. The method of claim 15, further comprising saturating the first pressurized stream with water vapor prior to forming the first syngas. 19. The method of claim 15, wherein: the first pressurized stream has a pressure of about 60 bar to about 200 bar; the second syngas stream has a pressure of about 20 bar to about 60 bar; and the cooled syngas stream has a temperature of about 150° C. to about 500° C. 20. The method of claim 15, wherein the first syngas is introduced to the syngas expander at a temperature of greater than or equal to about 900° C. 21. The method of claim 20, wherein the temperature is greater than or equal to about 1,050° C. 22. The method of claim 15, further comprising cooling the syngas expander with a coolant selected from the group consisting of recycled syngas, steam, nitrogen, and combinations comprising at least one of the foregoing coolants. 23. The method of claim 15, further comprising introduce water vapor to the hydrogen stream using a saturator prior to introducing the hydrogen stream to the gas turbine unit, wherein the saturator recovers heat from a component selected from the group consisting of a cooler, a carbon dioxide compressor unit, a second compressor unit, and combinations comprising at least one of the foregoing components. 24. A power system, comprising: a first compressor unit configured to compress an air stream and form a first pressurized stream; a syngas generator in fluid communication with a fuel stream and the first compressor unit and configured to generate a first syngas stream; a syngas expander unit configured to receive the first syngas stream at a temperature of greater than or equal to about 900° C., and to reduce the pressure of the first syngas stream to a second syngas stream; a first steam generator configured to cool the second syngas stream to a cooled syngas stream; a water gas shift reactor configured to convert carbon monoxide in the cooled syngas stream to carbon dioxide and to form a converted syngas stream; a carbon dioxide removal unit configured to remove carbon dioxide from the converted syngas stream and to form a carbon dioxide stream and a hydrogen stream; and a gas turbine unit configured for receiving the hydrogen stream and for generating power. 25. The power system of claim 24, wherein the temperature is greater than or equal to about 1,050° C.