Power generation process utilizing fuel, liquid air and/or oxygen with zero CO2 emissions

A process for producing power and liquefying a gas, the process comprising:

• 1) producing, in a combustor, an exhaust gas comprising water vapor and CO2,
• 2) expanding said exhaust gas in a first expander generating power, thus obtaining an expanded exhaust gas,
• 3) cooling the expanded exhaust gas in a waste heat recovery unit (WHRU), thus obtaining a cooled exhaust gas and partial condensation of the water vapor,
• 4) separating a portion of condensed water vapor in a first separator, thus obtaining a partially dehydrated exhaust gas,
• 5) pumping the portion of the condensed water vapor separated in the first separator by a first pump and recycling it to said combustor,
• 6) cooling said partially dehydrated exhaust gas in a first heat exchanger, thus obtaining a further cooled exhaust gas,
• 7) separating a second portion of the condensed water vapor in a second separator, thus obtaining a further dehydrated exhaust gas,
• 8) subjecting said further dehydrated exhaust gas to further dehydration, thus obtaining an exhaust gas mainly composed of CO2,
• 9) liquefying the CO2 in said exhaust gas mainly composed of CO2 in a liquefaction unit (LU), thus obtaining a liquefied CO2 flow, and
• 10) separating a portion of said liquefied CO2 flow and recycling it to said combustor,
• wherein, during step 2), the generated power is converted into electrical energy and/or mechanical energy,
• wherein during step 3), inside the WHRU, cooling of the expanded exhaust gas is obtained by heat exchange with a first working fluid pumped from a first working fluid storage tank, and wherein said cooling is obtained by one or a plurality of successive heat exchange steps with the first working fluid, and
• wherein, in step 9), said liquefying is performed using the first working fluid and a second working fluid for heat exchange with the CO2, wherein the second working fluid is oxygen and is pumped from
• a second working fluid storage.