Cryogenic liquefaction and separation of CO2 using nitrogen removal unit cold energy

摘要: Abstract The paper presents the separation of liquid CO2 from flue gases produced by oxy-fuel combustion using a cryogenic method. outlet N2 stream nitrogen removal unit (NRU) is utilized as cold source condenser in liquefaction system. Due to low temperature expanded nitrogen, no external refrigeration cycle required. This heat integration allows resource consumption be reduced and economized. influence selected process parameters (flue gas composition operating pressures) on recovery was analyzed. In this process, 83.07% with 99.17% purity captured. required energy for liquefied carbon dioxide 0.125 kWh/kg (449 kJ/kg CO2). Cryogenic capture often considered an unrealistic technology due expected high cooling costs. So far, duty obtained processes LNG regasification or/and air separation. shows that addition module natural significant reduction consumption. Denitrogenation poorly described literature work provides comprehensive description NRU double columns Newly developed offers unique opportunity produce at moderate conditions. An both technically economically advantageous. A hybrid NRU-CO2 installation innovative concept commercial potential.