松木屑与煤加压热解特性

Pressurized pyrolysis characteristics of pine sawdust and coal

研究松木屑和新疆博斯坦煤的加压单独热解及共热解特性,热解实验在加压热重分析仪上开展,压力为0.1~2.0MPa.通过样品热解失重情况绘制热解失重曲线,对曲线进行失重速率分析和热解动力学分析.结果发现,热解压力升高会抑制样品热解挥发分的析出,使样品主要热解阶段的表观活化能增大56%~85%;松木屑与煤共热解过程不是两者单独热解过程的简单叠加,而是两者协同反应相互促进或抑制的结果,松木屑与煤共热解失重相较计算值在加压条件下提高了8%~23%,在常压条件下降低了6.7%,但不管是常压还是加压共热解,共热解主要热解阶段的表观活化能均较松木屑和煤单独热解降低.

The pressurized individual pyrolysis and co-pyrolysis characteristics of pine sawdust and Xinjiang Bernstein bituminous were analyzed.Pyrolysis experiments were conducted in pressurized thermogravimetric analyzer (PTGA) under 0.1-2.0 MPa.Pyrolysis weight loss curves were drawn according to samples pyrolysis weight loss,and weight loss rate and pyrolysis kinetics of curves were examined.Results show that increased pressure depresses the release of volatiles and increases apparent activation energy of the main pyrolysis stage by 56%-85%. The process of co-pyrolysis is not the accumulation of individual pyrolysis,but is affected by inhibition or acceleration effect of synergistic reaction.The experimental weight loss of co-pyrolysis increases 8%-23% in pressurized condition while decreases 6.7% in atmospheric condition compared to the calculated results.The apparent activation energy of co-pyrolysis in both atmospheric and pressurized condition is lower than that of individual pyrolysis during the main pyrolysis stages.