Impurity Impacts On The Purification Process In Oxy-fuel Combustion Based Co_2 Capture And Storage System

摘要

Based on the requirements of CO_2 transportation and storage, non-condensable gases, such as O_2, N_2 and Ar should be removed from the CO_2-stream captured from an oxy-fuel combustion process. For a purification process, impurities have great impacts on the design, operation and optimization through their impacts on the thermodynamic properties of CO_2-streams. Study results show that the increments of impurities will make the energy consumption of purification increase; and make CO_2 purity of separation product and CO_2 recovery rate decrease. In addition, under the same operating conditions, energy consumptions have different sensitivities to the variation of the impurity mole fraction of feed fluids. The isothermal compression work is more sensitive to the variation of SO_2; while the isentropic compression work is more sensitive to the variation of Ar, In the flash system, the energy consumption of condensation in is more sensitive to the variation of Ar; but in the distillation system, the energy consumption of condensation is more sensitive to the variation of SO_2, and CO_2 purity of separation is more sensitive to the variation of SO_2.