Reactivities of Shenfu Chars Toward Gasification with Carbon Dioxide

摘要

Five Shenfu char samples were prepared from Shenfu raw coal at different temperatures (950,1100,1200,1300 and 1400 ℃) using a muffle furnace. Demineralization of the char samples was performed by treating them with 10% nitric acid for 10 min in a CEM Discover microwave reactor. The gasification of the chars,and corresponding demineralized chars,in a carbon dioxide (CO2) atmosphere was conducted in a Netzsch STA 409C131F tempera-ture-programmed thermogravimetry apparatus. The effects of charring temperature and demineralization on the gasi-fication reactivity of chars were systematically investigated. The results show that a char formed at a lower tempera-ture is more reactive except for demineralized char formed at 1100 ℃,which is less reactive than char formed at 1200 ℃. Demineralization decreases the char reactivities toward gasification with CO2 to a small extent.