Method for the capture and disposal of carbon dioxide in an energy conversion process

An energy conversion process that also exports by-product CO2 at elevated pressure;

• comprising the following steps:
• (a) admixing a second fuel gas feed stream derived from a first fuel gas stream with a reactant stream and where into at least part of, the second fuel gas feed stream, the reactant stream or both, additional CO2 is added through desorption by contacting said stream/streams with a CO2-rich solvent stream in a first stage contactor to produce a mixed feed gas stream and a CO2-lean solvent stream;
• (b) reacting said mixed feed gas stream in a chemical conversion step, where further CO2 is produced;
• (c) chilling at least part of the products of said chemical conversion step, at a pressure of at least 10 bar to liquefy part of the CO2 in said products and thereby produce a CO2-lean gas stream;
• separating said CO2 so liquefied and then heating the liquid CO2 at a pressure of at least 30 bar to produce CO2 suitable for export as a high pressure gas or supercritical fluid and thereby recovering cold from said liquid CO2, to assist said chilling step;
• (d) passing at least part of said CO2-lean gas stream to a second stage contactor where further CO2 is removed, by absorption in a solvent stream lean in CO2 derived from said CO2-lean solvent stream, to produce a product gas stream and a solvent stream rich in CO2 from which said CO2-rich solvent stream is subsequently derived.