CO2 Separation Process Using Circulating Fluidized Bed Based on Exergy Recuperation

In this paper, an innovative energy saving CO2 separation process using chemical absorption was proposed from an energy saving point of view. In this process, metal oxide particles were selected as absorbents, which do not require separation energy of liquid/gas. These particles were fluidized by feed gas mixture for increasing segregation effect in the bed and heat transfer rate from chemical reaction to a heat pump system. Heat of absorption was recuperated and supplied as heat of thermal decomposition through a heat pump system based on the principle of exergy recuperation. In addition, some of the heat was circulated with the absorbents. The energy saving performance of the proposed process was evaluated by simulations.