ENERGY-EFFICIENT METHOD FOR PRODUCING COMPRESSED CARBON DIOXIDE SUITABLE FOR ENHANCED OIL OR GAS RECOVERY

摘要

An energy-efficient method for producing purified, compressed carbon dioxide (435) suitable for enhanced oil or gas recovery (EOR/EGR) and electricity from a gaseous hydrocarbon feed (100) using a SOFC system (1), the method comprising inter alia the steps of: introducing the gaseous hydrocarbon feed (100) into the SOFC system (1); adding a recycled anode off gas comprising hot steam (309) to the hydrocarbon feed (100); introducing the hydrocarbon feed ( 100) comprising hot steam into a reformer ( 108) of the SOFC system (1); generating a reformed process gas (109) in the reformer (108); passing the reformed process gas (109)into the solid oxide fuel cell (2); in the solid oxide fuel cell (2), converting hydrogen and carbon monoxide of the reformed process gas (109) into an anode off-gas (301) and into a depleted air (208); separating the anode off-gas (301) into a recycled anode off-gas (304) and a remaining off-gas (320); recycling the recycled anode off-gas (304) above condensation temperature to provide the recycled anode off gas comprising hot steam (309); passing the remaining anode off-gas (320) into a water- gas shift unit (322); in the water-gas shift unit (322) create a shifted anode off-gas (326) and passing the shifted anode off-gas (326) into a separation system (400) to create compressed carbon dioxide (435).