Evolution of carbon microstructure and gasification activity during rice husk gasification

In order to investigate the evolution of carbon microstructure and gasification activity during circulating fluidized bed gasification, the simulated circulating gasification of a rice husk was carried out in a laboratory fixed bed reactor, and the pore structure, carbon microstructure and gasification activity of char during gasification were investigated. The results show that the BET surface area of char increases firstly and then decreases with an increase in gasification cycle times, and the surface areas of rice husk chars obtained from circulating gasification process are much higher than that of original char. The I_D1/I_G values of char decrease monotonously with an increase in gasification cycle times, indicating that the graphitization degree of carbon structure in char increases. Meanwhile, the relative content of A_D3+D4 of char decreases firstly and then increases slightly with the progress of circulating gasification, and the relative contents of A_D3+D4 of all chars obtained from a circulating gasification process are lower than that of original char. Moreover, the gasification activity of char increases gradually with an increase in gasification cycle times, and the gasification activity of all chars obtained from a circulating gasification process are higher than that of original char.