Absorption of CO2 With Amines in a Semiclosed GT Cycle: Plant Performance and Operating Costs

A CO2 removal system, using aqueous solutions of amines, is applied to a Semi-Closed Gas Turbine/Combined Cycle (SCGT/CC) power plant.The SCGT/CC is interesting because of the possibility of achieving low emissions at the stack, with a decreased overall flow rate, lower NOx concentration and an increased CO2 concentration (over 15% in volume), which facilitates the removal treatment.Several compositions of the absorbing solution have been investigated, by means of simulations with ASPEN PLUS.A 18% DEA + 12% MDEA composition resulted the most convenient in terms of flow rate and energy requirement for the stripping.A cost analysis of the removal plant allows to estimate additional costs for CO2 removal with respect to conventional power plants.© 1998 ASME