Reforming system for combined cycle plant with partial CO2 capture

A method for producing power and partially capturing carbon dioxide, comprising:

• reforming a mixed fuel stream comprising a first fuel and a steam in a pre-steam-methane-reformer at a temperature of less than about 800 degrees Celsius to produce a first reformate stream comprising hydrogen, carbon monoxide, and steam;
• converting the steam and the carbon monoxide in the first reformate stream to a second reformate stream comprising carbon dioxide and hydrogen in a water-gas-shift reactor;
• removing the carbon dioxide from the second reformate stream in a carbon dioxide removal unit to produce a carbon dioxide stream and a third reformate stream, wherein less than about 50 percent of the carbon contained in the first fuel is recovered as carbon dioxide by the carbon dioxide removal unit;
• combusting a mixture of the third reformate stream and a second fuel stream in a gas turbine unit to generate power and produce an exhaust gas stream;
• and
• utilizing heat in the exhaust gas stream to generate the steam in a heat recovery steam generator, wherein the steam is used to generate power and form the mixed fuel stream with the first fuel.

A combined cycle system comprising:

• a combination unit comprising a heat recovery steam generator, wherein the heat recovery steam generator comprises at least two stages, wherein a first stage comprises a pre-steam-methane-reformer, wherein the pre-steam-methane-reformer is configured to operate at a temperature of less than about 800 degrees Celsius and utilize heat from an hot exhaust gas stream to reform a mixed fuel stream, comprising a first fuel and a steam, to form a first reformate stream, and wherein a second stage utilizes heat from the exhaust gas stream to form the steam;
• a shift reaction unit comprising a water-gas-shift reactor configured to convert carbon monoxide in the first reformate stream to carbon dioxide and form a second reformate stream;
• a carbon dioxide removal unit configured to remove carbon dioxide from the second reformate stream and form a carbon dioxide stream and a third reformate stream;
• wherein less than about 50 percent of the carbon contained in the first fuel is recovered as carbon dioxide by the carbon dioxide removal unit;
• and
• a gas turbine unit configured for receiving a second fuel and the third reformate stream and generating power and the exhaust gas stream.