Effect of torrefaction pretreatment on chemical looping gasification characteristics of microalgae
To address the high water content and low energy density of microalgae,and to enhance its chemical looping gasification characteristics,this study focuses on the microalgae subjected to torrefaction pretreatment at 200℃,250℃,and 300℃.Using thermogravimetric analysis,the chemical looping gasification characteristics of microalgae with Al2O3,Fe2O3,and Ca2Fe2O5 as oxygen carriers are investigated.The effects of torrefaction pretreatment and oxygen carrier on the gasification characteristics and kinetic parameters of microalgae are investigated.The results show that H/C and O/C atomic ratios of microalgae significantly decrease after torrefaction pretreatment,from 1.68 and 0.436 to 1.11 and 0.139,while C content and high calorific value dramatically increase.During chemical looping gasification,both torrefaction pretreatment and the addition of oxygen carriers(Fe2O3,Ca2Fe2O5)can improve the chemical looping gasification reaction rate of microalgae.According to the analysis of reaction kinetics,the activation energy of chemical looping gasification of torrefaction microalgae is lower than that of original microalgae.This indicates that torrefaction pretreatment can improve the chemical looping gasification characteristics of microalgae.
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