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, by combusting a fuel at a pressure higher than atmospheric pressure and in an atmosphere of CO2 and O2, an exhaust gas comprising water vapor and CO2,
• 2) expanding said exhaust gas in a first turbine generating power production, thus obtaining an expanded exhaust gas,
• 3) cooling the expanded exhaust gas in a waste heat recovery unit (WHRU), inside the WHRU, by virtue of heat exchange with a first working fluid is liquid air or oxygen-depleted air which is heated, thus obtaining a partial condensation flow of the water vapor,
• 4) separating, in a first separator, the condensed water vapor and a partially dehydrated exhaust gas,
• 5) compressing said partially dehydrated exhaust gas in a first compressor, thus obtaining a compressed exhaust gas,
• 6) separating a first portion of said compressed exhaust gas and further compressing it in a second compressor, thus obtaining a flow of further compressed exhaust gas,
• 7) returning the flow of further compressed exhaust gas to said combustor,
• 8) cooling a second portion of said compressed exhaust gas in a first exchanger, thus obtaining a second cooled portion,
• 9) separating, in a second separator, a flow of condensed water vapor and a further dehydrated exhaust gas,
• 10) further dehydrating said further dehydrated exhaust gas, thus obtaining an even further dehydrated exhaust gas, and
• 11) liquefying the CO2 contained in said even further dehydrated exhaust gas which comprises a heat exchange between said even further dehydrated exhaust gas and a flow of a second working fluid in a liquefaction unit, thus obtaining a flow mainly composed of liquid CO2 and a flow of the second partially heated working fluid,
• wherein said first working fluid is produced by air liquefaction or air separation,
• wherein said second working fluid is liquid oxygen optionally produced by air liquefaction or air separation, and
• wherein the flow of the second partially heated working fluid is used in step 3) in a further step of heat exchange with the expanded exhaust gas, thus obtaining a further heated flow of said second working fluid.