烘焙木屑与褐煤共热解特性研究

STUDY ON CO-PYROLYSIS CHARACTERISTICS OF TORREFIED SAWDUST AND LIGNITE

褐煤与木屑及在250℃/30 min的条件下烘焙后的木屑进行不同比例的掺混,分别通过热重分析仪和900℃高温热解研究其共热解特性。研究表明,木屑通过烘焙后,初始热解温度升高,热解剩余物增加,更接近褐煤;褐煤掺混的热重分析过程中,两种木屑的添加有利于提高反应物的转化率,但木屑的作用更强;与褐煤的高温共热解过程中,两种木屑的添加有利于提高气体和液体产物产量,烘焙木屑比木屑更有利于气体产生,而木屑更有利于液体产生;两种木屑的添加还有利于H2的产生,但木屑的作用更明显;烘焙木屑和褐煤共热解与两种物质单独热解焦油成分对比得出,共热解有利于使焦油成分变的简单,烘焙木屑与木屑单独热解焦油成分对比得出,烘焙过程可有效减少焦油中的物质。

Lignite was mixed with sawdust and torrefied sawdust at the condition of 250 ℃/30min with different ratios , then the co-pyrolysis characteristics of the mixed material were studied by thermogravimetric analyzer and pyrolysis experiments at high temperature of 900 ℃. The study shows that the initial pyrolysis temperature and the remainder of torrefied sawdust are higher than sawdust, so the characteristics of torrefied sawdust are more close to lignite. The addition of the two kinds of sawdusts has the advantage of enhancing conversion in the study of thermogravimetric analysis of the mixed material. However, the effect of the sawdust is better. The two kinds of sawdusts are good for raising the gaseous and liquid yield of the mixed reactant when co-pyrolyzed at high temperature. The torrefied sawdust is better than sawdust on raising gaseous yield, but the sawdust is more effective on raising liquid yield. The two kinds of the sawdust also have good effect on production of H2 and the sawdust has a better effect. Comparing co-pyrolysis of torrefied sawdust and lignite with mono-pyrolysis of sawdust and lignite, later has more compounds in the tar. Tar analysis of mono- pyrolysis of torrefied sawdust and sawdust shows that torrefaction has positive effect on reducing compounds in the tar.