Syngas power systems and method for use thereof

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.

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.