Post-combustion CO2 removal from flue gas at power plant via a two-bed CaO-CO2 loop (CaL) with heat provided by in-situ oxy-fuel combustion has been investigated. Based on the principle of chemical reaction engineering

a simple analytical model with one variable N only (solids circulation ratio) has been built and used for analysis of the CaL process systematically

which includes effects from sorbent reactivity

fuel impurity and the utilization of fuel heat to looping. From the model

the minimum heat duty and the looping penalty are obtained. Both of them are impacted by fuel sulfur and ash significantly. The result also indicates that the optimum solids circulation ratio N will be located between the two minimum points. The furnace factor is important

because it can eventually reduce the fuel firing rate

fuel ash and sulfur effect

oxygen requirement and related auxiliary power

and increase steam cycle efficiency. As found

the heat duty approaches to infinite at a critical solids circulation ratio NC

which is a constraint to the operable N and the fuel burned. All of the effects are interconnected by the model.