Techno-economic evaluation of integrated NOx and SOx removal in pressurized flue gas systems for carbon capture applications

This study evaluates the technical and economic performances of an integrated NOx and SOx removal unit in pressurized flue gas systems that are applicable to oxy-fuel and chemical looping combustion plants. The cost is estimated using a bottom-up and discounted cash-flow approach based on a flowsheet model that includes a detailed description of the pH-dependent gasand liquid-phase interactions of nitrogen and sulfur. The results show that the proposed integrated removal process is able to achieve emission control efficiencies comparable to the best-available techniques, albeit at about one-third of the cost for a system involving flue gas desulfurization plus selective catalytic reduction.