Chemical looping process CLP using metal oxides
The main components of outlet streams for the combustion of rice husk from the empty bed reactor operated at different temperatures were determined to be CO2 and CO in this study, as illustrated in Fig. 2. High CO2 concentrations (more than 80%) were observed for experiments carried out at different temperatures, and possibly generated from the combustion of carbon and oxygen contained in rice husk (as shown in Table 1). The concentration of CO was increased with increasing operating temperature of the ADMBR, whereas the concentration of CO2 was slightly decreased. Baratieri et al.  analyzed the equilibrium composition of products for PF-04217903 gasification, and also reported that CO2 formation is favored at lower operating temperatures, while CO is dominant for gasification occurred at high temperatures . Based on the carbon balance, the fuel conversion (XC) is defined as:equation(6)XC=FC,consumedFC,biomass=[(FCO2,out+FCO,out+FCH4,out)-(FCO2,in)]FC,biomass×100%where FC,biomassFC,biomass and FC,consumedFC,consumed are the input and consumed molar flow rate of biomass on carbon basis, respectively; FCO2,inFCO2,in is the input molar flow rate of CO2 on carbon basis for biomass gasification; FCO2,out,FCO2,out,FCO,outFCO,out and FCH4,outFCH4,out are the output molar flow rate of CO2, CO, and CH4, respectively, on carbon basis. The fuel conversion of rice husk gasification was enhanced with operating temperature, which was calculated to be about 70% for experiments conducted at 900 °C.