Thermodynamic analysis of simultaneous CO2/SO2 capture characteristics of CaO-based sorbent

FactSage6.1 thermodynamic simulation software used to simulate a close system(S_O2:0.4v%, CO₂:16v%, N2:75v%, O,: 5v%, Ca/S = 1:1)in all matter well mixing at 873-1073 K and latm pressure. Studied the simultaneous CO₂/SO₂ capture characteristics of CaO-based sorbent in different temperature, different CO₂, SO₂ partial pressure and different oxygen content. The result shows: In absence oxygen system CaO-based sorbent capture CO₂/SO₂ was relate to temperature and partial pressure; CaO-CO₂ reaction was increased with temperature. The highest CaCO₃ content was 0.18mol at 1029 K. Moreover, P_SO2 could change the system compose situation more easy than P_CO2 In present oxygen system CaO-SO₂ reaction product CaSO₄ was the most stable matter so increase P_CO2 having little affect to CaO-SO₂ reaction. When oxygen putted in system step by step, CaSO₂ would have react with oxygen firstly, then direct sulfation was beginning.