The integral part of chemical looping combustion (CLC) and chemical looping with oxygen uncoupling (CLOU) for solid fuels such as biomass consists of an interconnected fluidized air and fuel reactor. The heat recovery/loss in both reactors needs to be analyzed to commercialize these novel fuels based on CLC and CLOU processes. Here, complete process level modelling of CLC and CLOU process is attempted and explored using the ASPEN simulator with sawdust as the biomass. Initially, a benchmarking study of CLC is performed to validate the CO2, CO, and CH4 concentration in the fuel reactor and O2 and CO2 concentrations in the air reactor using 81.1 % Fe2O3 (oxygen carrier) as the reactive component. Thereafter energy analysis is carried out with sawdust biomass using the catalyst combination of 60 % Fe2O3−Al2O3 and 40 % CuO−ZrO2 for CLC and CLOU, respectively. In biomass, for CLOU a 51 % conversion is realized in the fuel reactor and 48 % is realized in the air reactor. The energy analysis gave a difference in energy output between CLC and CLOU of 43 Watts i.e., 201 Watts in CLOU and 158 Watts in CLC.

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Chemical looping combustion (CLC) is a modern technology that enables the mitigation of the CO2 concentration without any expense of energy. Experimental evidence shows that combustion of coal/biomass in CLC technology leads to negative carbon emission by replacing the portion of coal with biomass. In the present work, CLC was simulated using a mixture of coal/biomass in CLC; using their different proportions resulted in enhanced CO and CO2 fractions in the fuel reactor. The carbon capture and oxide oxygen fraction were also found to increase with the enhancement of the fuel reactor’s temperature with different proportions of coal/biomass. Increases in the carbon capture efficiency and oxide oxygen fraction of up to 98.86% and ~98%, respectively, were observed within the experimental temperature range. The simulated results of various parameters were predicted and validated with the published experimental results. The stated parameters were also predicted as a function of the different rates of solid circulation and gasification agents. Higher coal char conversion was confirmed in the fuel reactor with the presence of higher biomass concentrations.