Abstract: On the basis of the properties analysis of residue from a 450,000 TPY oil-coal co-processing unit,the residue was separated by solvent extraction into three components: n-heptane soluble(HS),n-heptane insoluble-toluene soluble(HI-TS)and toluene insoluble (TI). The properties of each component were analyzed by infrared spectroscopy and X-ray diffraction,and the pyrolysis performances of residue and coal with different blending rate of residue were studied. Compared with the feed coal, the residue from oil-coal co-processing unit had the characteristics of high ash, high carbon content, high sulfur content and low water content. The contents of HS,HI-TS and TI in the residue were 30.64%,22.61% and 44.19%,respectively. The content of saturated hydrocarbons in the HS was higher, the aromatic structures of the HI-TS were more, and the TI was mainly composed of coke with higher aromatization, unconverted coal, catalysts and additives. There was a certain synergistic effect in the co-pyrolysis of residue and coal. The appropriate blending ratio of the residue was 30%, and under this condition, the yields of tar, semi-coke, pyrolysis water and pyrolysis gas were 13.34%, 74.02%, 4.05% and 8.59%, respectively.    

Key words: oil-coal co-processing, residue, separation, pyrolysis, FT-IR, XRD

摘要： 在对某450 kt/a油煤共炼装置残渣基本性质分析的基础上,采用溶剂抽提法将残渣分离为正庚烷可溶物(HS)、正庚烷不溶物-甲苯可溶物(HI-TS)及甲苯不溶物(TI)3个组分,采用红外光谱、X射线衍射等方法对各组分进行了分析,对不同残渣掺混比例下残渣与煤热解性能进行了探索。结果表明,与原料煤相比,油煤共炼残渣具有高灰分、高碳、高硫、少水等特点,残渣中HS,HI-TS及TI的质量分数分别为30.64%,22.61%,44.19%;HS的饱和烃含量较高,HI-TS的芳香结构较多,TI以芳构化程度较高的焦炭、未转化的煤、催化剂及添加剂为主;残渣与煤进行共热解时表现出一定的协同效应,适宜的残渣掺混比例为30%,此时焦油、半焦、热解水及热解气的产率分别为13.34%,74.02%,4.05%,8.59%。

关键词: 油煤共炼, 残渣, 分离, 热解, 傅里叶变换红外光谱, X射线衍射