Coke gasification

CaSO4 chemical-looping combustion and CaCO3 decomposition were integrated into a CaO regeneration reactor in the simulation performed with Aspen Plus.The effects of temperature(700-1200℃)

pressure(0.1-4 MPa)on the required minimum H2O flow

coke flow

equilibrium product yields

pollution gas emissions

heat transfer between reactors and solids circulation rate were investigated.The minimum H2O flow and coke flow reduced with increasing temperature and the declining pressure.The percentages of H2S in product gases without H2O decreased with increasing temperature and declining pressure

while the percentage of SO2 had a reverse trend.The percentage of H2S+SO2 decreased first then increased with increasing temperature.H2S was the main gas pollutant at a lower temperature and was replaced by SO2 as temperature increased

which was explained by the side reactions of CaSO4.The heat and recycled solids between the reactors decreased while solids circulation rate increased with increasing temperature

but the heat and recycled solids between the reactors increased while solids circulation rate decreased with increasing pressure.