Abstract
Thermodynamic modeling of chemical looping gasification (CLG) is carried out using Gibbs free energy minimization approach to, determine the optimal operating condition, analyze the optimal performance and generalize to any feedstock. Optimal operating condition is identified by analyzing the effect of mole Fe2O3/mole C (OC/C) on carbon conversion and Cold Gas Efficiency (CGE). Simulations using four different oxygen carriers (OC) reveal that, CGE shows a maximum with increase in OC/C. The OC/C at which CGE attains a maximum is proposed to be called as the Maximum CGE Point (MCP). It is shown that, unlike conventional gasification, the carbon conversion in CLG is less than 100 % at the point of maximum CGE. MCP is shown to be the optimal operation point since CGE is higher at MCP than that at carbon boundary point. Finally, it has been demonstrated that the optimal performance analysis at MCP can be generalized for feedstock of any H/C and O/C in the form of contour plots.
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