Simulation and Optimization of Oxy-Fuel Gas Cycle Power Plant with CO2 Capture

This paper presents a steady-state simulation study of oxy-fuel gas cycle power plant with CO₂ amine absorption process using process software Aspen HYSYS™. The oxy-fuel gas cycle power plant studied was decomposed to four units: the air separation unit (ASU), the gas turbine cycle, the heat recovery steam generator (HRSG) and the CO₂ capture process. Based on the steady-state simulations, the energy performance of the process investigated under different operating conditions. An optimal net efficiency was obtained at about 60% oxygen purity under 90% CO₂ recovery rate and 0.3 CO₂ lean loading in the CO₂ amine absorption. The CO₂ capture process mainly affects net efficiency of power plant in low oxygen purity, and the power requirement of ASU is main factor in high oxygen purity.