玉米秸秆成型燃料的微观结构观察与分析

Observation and analysis on micro-structure of corn straw briquette fuels

玉米秸秆成型燃料是生物质能利用的主要方式,选取具有代表性的玉米秸秆成型燃料作为试验对象,运用场发射投射电子显微镜(JEM-2100F)对其微观结构进行观察,通过对图像进行分析,压缩后的成型燃料致密程度显著增加,减少的是原生物质的孔隙率,其组织结构变得纵横叠加,且层与层之间的空隙较小,连接物无明显界线,结合紧密,断面的形成有相互牵拉的迹象;通过计算分析,玉米秸秆致密成型燃料的相对孔隙率为22.8%,因此,在燃烧过程中应增加氧气的供应量与燃料强制混合。研究为成型燃料燃烧机理的研究提供实验依据,是成型燃料燃烧设备和加工设备设计的重要理论基础和设计依据。

The corn straw briquette fuel is an important way of biomass energy utilization. This experiment took corn straw as experiment material to find out the micro-mechanism character of biomass briquette fuel, which uses the JEM-2100F Field Emission High Resolution Transmission Electron Microscope（FE-HRTEM） to get the original images for analysis. The analysis of image indicates that compressed briquette density levels increase significantly, reducing the original porosity of biomass, its vertical and horizontal organizational structure change overlay, between layer and layer has the smaller gap, the connecting lines are not significant, the formation of cross-section has signs of pulling. Calculating results show that the relative porosity of the corn straw briquette fuels is 22.8 %. Therefore, in the combustion process excessive of oxygen should be added and the mixture of fuel should be enhanced. The study may provide an experimental basis for the mechanism of the briquettes fuel combustion, and the important theoretical and design basis of the briquettes fuel combustion equipment and processing equipment design.