Integration of low-temperature transcritical CO2 Rankine cycle in natural gas-fired combined cycle (NGCC) with post-combustion CO2 capture

► Process simulation to quantify the efficiency penalty for capture and compression. ► A transcritical CO2 power cycle to recover low-temperature heat and produce power. ► The CO2 power cycle reduces the CO2 capture efficiency penalty by 1.6%-points. ► The method of Lean Vapour Recompression for reducing the heat demand. ► Lean Vapour Recompression reduces the CO2 capture efficiency penalty by 1.8%-points.