淖毛湖煤慢速热解过程官能团相互作用

To study the interaction between functional groups during slow pyrolysis of coal, Naomaohu coal (NMHcoal) sample was pyrolyzed in a drop tube furnace reactor with a short residence time to prepare rapid pyrolysis char (NRPchar) with part remained reactivity of coal but most of the low-temperature crosslinking site precursor eliminated. TG results indicated that the pyrolysis of NMHcoal/NRPchar with a ratio of 5:5 at 500℃ shows a strong negative synergy. The fixed bed pyrolysis results show that some volatiles generated by the pyrolysis of NMHcoal diffused into the NRPchar, which provided more probability and time to the combination of •CH₃ with aromatic carbon radicals and •O. As a result, the structure of naphthalenes and phenols containing methyl groups in tar, and also the alkylated oxyaromatic carbon structure and ether structure in the char increased. The increased release of phenols reduced the oxyaromatic carbon structure in the char. More polycyclic aromatic hydrocarbon precursors are generated in NRPchar, they react with phenolic substances to generate polycyclic aromatic hydrocarbons and CO, which increase the content of 5 and 6 ring compounds in the co-pyrolysis tar, while the other part is retained in the semi-coke to reduce its specific surface area.