Study On Fuel-N Conversion During Rapid Pyrolysis Of Anthracite In Co2 At High Temperature

Here, a study was conducted on fuel-N conversion during anthracite rapid pyrolysis in CO2 at high temperature using a drop-tube furnace (DTF). NO and HCN were the main products in CO2 atmosphere and NO occupied a larger proportion. Due to char-CO2 gasification, more oxygen-derived groups were introduced onto the char surfaces. High temperature enhanced gasification reaction, leading to a more developed pore structure and a larger specific surface area of char, which greatly increased the reaction sites of (-CN) with oxidizing free radicals. More active nitrogen sites were exposed in CO2 atmosphere, promoting char-N release. HCN yield in CO2 atmosphere was lower than that in N-2 atmosphere due to the oxidation of (-CN) by (-O). Gasification reaction promoted the fuel-N release, resulting in HCN maximum yield at a lower temperature. N-2 production increased while char-N yield decreased as temperature was increased from 1173 to 1773 K for anthracite.