The low prices and its Upcycled Top relatively low carbon intensity of natural gas have encouraged the coal replacement with natural gas power generation.Such a replacement reduces greenhouse gases and other emissions.To address the significant energy penalty of carbon dioxide (CO2) sequestration in gas turbine systems, a novel high efficiency concept is proposed and analyzed, which integrates a flame-assisted fuel cell (FFC) with a supercritical CO2 (sCO2) Brayton cycle air separation.
The air separation enables the exhaust from the system to be CO2 sequestration-ready.The FFC provides the heat required for the sCO2 cycle.Heat rejected from the sCO2 cycle provides the heat required for adsorption-desorption pumping to isolate oxygen via air separation.
The maximum electrical efficiency of the FFC sCO2 turbine hybrid (FFCTH) without being CO2 Kitchen Island sequestration-ready is 60%, with the maximum penalty being 0.68% at a fuel-rich equivalence ratio (Φ) of 2.8, where Φ is proportional to fuel-air ratio.
This electrical efficiency is higher than the standard sCO2 cycle by 6.85%.The maximum power-to-heat ratio of the sequestration-ready FFCTH is 233 at a Φ = 2.
8.Even after including the air separation penalty, the electrical efficiency is higher than in previous studies.