高硫煤与生物质共热解脱有机硫研究

ORGANIC SULFUR REMOVEL FROM HIGH SULFUR COAL DURING CO-PYROLYSIS WITH BIOMASS

选取渭北石炭纪高有机硫煤与小麦秸秆进行共热解实验,采用正交实验考察了热解温度、升温速率、停留时间和煤与生物秸秆的混合比以及煤与生物秸秆成型压力等对热解脱有机硫及有机硫脱除规律的影响.结合FTIR和SEM分析了共热解半焦的结构特征、孔隙结构与发育情况,并讨论了低温溶剂萃取精制对煤与生物质共热解脱硫效果的影响.结果表明,热解温度对脱硫率的影响最显著.共热解制备较高脱硫率半焦所适宜的最佳水平为850℃,15℃/min,5min,1∶4和2MPa.共热解半焦孔结构发育整齐规则,孔壁薄,孔径较大,有利于热解过程中硫的析出与扩散.低温溶剂萃取提高了共热解脱硫率,尤其是热水精制煤与生物秸秆共热解脱硫率约为39%.

The co-pyrolysis of carboniferous high sulfur coal from Weibei with white straw was presented.The effects of the pyrolysis temperature,heating rate,holding time,mix ratio of coal and biomass and pressure on the desulfurization of organic sulfur and its desulfurization law were investigated by the orthogonal test.FTIR and SEM were employed to analyze structure characteristics and pore properties of the semi-coke.The effects of low temperature extractions on the desulfurization of co-pyrolysis with biomass were introduced.The results show that the effect of pyrolysis temperature on desulfurization rate is significant.The best desulfurization conditions are 850℃,15℃/min,15 min,1∶4and 2MPa.Pore structure of co-pyrolysis semicoke presents with a degree of regularity,thin walls,and relative large diameters,which benefits the release and spread of sulfur during co-pyrolysis.The desulfurization rates of co-pyrolysis are increased by low temperature extractions,especially for the hot water refined coal.Its co-pyrolysis desulfurization rate is about 39%.