Use of Simulation To Optimize NOx Abatement by Absorption and Selective Catalytic Reduction

This paper describes the development of an ASPEN PLUS simulation model for a commercial NO x abatement system involving both absorption and selective catalytic reduction (SCR). The model helps identify operator guidelines and retrofit options needed to enable the commercial system to operate efficiently during surges in NO x -laden fumes without incurring costly fines. The resulting model applies a reactive-distillation module with a practical reaction set for NO x absorption and implements a kinetic model for SCR. The simulation results agree well with both design specifications and literature data and provide practical insights for optimum operation and economical retrofits of the commercial system.