Modelling of CO2 separation from exhaust gases

World tendencies in environmental protection points out necessity of reduction of CO2 emission to atmosphere. The one of main sources of CO2 emission is placed in energy sector where electric energy and heat are produced based on fossil fuels combustion. Therefore, it seems to be necessary to perform research on CO2 emission reduction in this sector. The main aim of work presented in this paper was to analyse and asses influence of CO2 separation unit from flue gases on total efficiency of conventional power station, based on numerical simulations. The analysed separation unit realises mixed PTSA (Pressure-Temperature Swing Adsorption) separation technology which is based on varied with temperature and pressure sorption properties of sorbents. Mathematical model of the process was elaborated and used to formulate simulation model of such unit with use of IPSEpro simulation software by SimTech. Heat for sorbent regeneration is derived from steam bleeding of the supercritical power station which the simulation model, including model of separation unit, was also elaborated with this software. Results obtained from calculations point out that mixed PTSA technology, owing to utilisation of waste heat for sorbent regeneration, is more efficient compared to PSA only. Analysed technology of CO2 separation seems to be promising in spite of meaningful influence on decrease of total energetic efficiency of power Ration, however, it needs more efficient and productive sorbents.