棉秆结构及热解规律的研究

Research upon the Structure and Pyrolysis of Cotton Stalk

[目的]研究棉秆的结构及热解规律。[方法]采用热重分析法研究了棉秆纵向(棉杆和棉根)及横向(皮层、质层和髓层)的热解特性。[结果]棉秆是一种质地不均匀的材料,其横、纵向各结构存在较大差异,各层成分含量差异明显。棉杆和棉根随升温速率增大反应程度越剧烈,炭得率依次减小,且相同升温速率下,棉杆炭得率高于棉根;皮、芯、髓层炭得率依次减小,皮层反应剧烈程度小于芯和髓层。[结论]该研究为获得棉秆活性碳技术提供了理论依据。

[Objective]To research upon the structure and pyrolysis of cotton stalk.[Method] In this paper thermogravimetric analysis is adopted to study pyrolysis characteristics on the longitudinal direction of cotton stalk（the stick and the root） and on the traverse direction（the cuticle,cortex and medulla）.[Result] Cotton stalk is a material of uneven and irregular texture,and there are great differences in the structure of all these parts on the longitudinal and traverse directions,especially in the contents of different components in each layer.The reaction in the stick and root becomes violent along with the increase in the rising rate of temperature,and carbon yield rate decreases in turn.Besides with the same rising rate of temperature,carbon yield rate of cotton stick is higher than the one of cotton root.Carbon yield rates of cuticle,cortex and medulla decrease in turn while the violence of the reaction in cuticle is less severe than in cortex and medulla.[Conclusion] It has provided theoretical basis for obtaining activated carbon technology of cotton stick.