褐煤与油菜秸秆结构及燃烧特性研究

Study on the structure and combustion characteristics of lignite and rape straw

以褐煤和油菜秸秆为研究对象,通过SEM、FT-IR、XRD、XPS等表征手段分析了二者的结构差异,利用热重分析技术考察了二者的热稳定性和燃烧反应性能,并对其燃烧过程的动力学参数进行了计算。研究结果表明:褐煤呈不规则碎块状结构,而油菜秸秆呈纤维长条状结构;与褐煤相比,油菜秸秆的碳含量低而氧含量高,且羟基、脂肪族基团及碳氧键合结构的含量均高于褐煤,而热稳定性低于褐煤;褐煤在燃烧反应过程中有一个明显的失重温区,而油菜秸秆有两个明显的失重温区,且其最大燃烧反应速率对应的温度分别较褐煤提前106℃和滞后27℃;油菜秸秆的起燃温度、燃尽温度均低于褐煤,而燃烧过程的活化能高于褐煤,且频率因子远高于褐煤。

The structural differences between Lignite and rape straw were analyzed by SEM,FT-IR,XRD,XPS analytical methods.The thermal stability and combustion reaction performance were investigated by thermogravimetric analysis,and the kinetic parameters in the combustion process were calculated.The results showed that the structure of lignite was irregular fragments,while the structure of rape straw was fibrous strip.Compared with lignite,rape straw had lower carbon content and higher oxygen content,and the contents of hydroxyl group,aliphatic group and carbon-oxygen bonding structure were higher than lignite,while the thermal stability was lower than lignite.There was an obvious weight loss zone in the combustion reaction process of lignite,while rape straw had two obvious weight loss zones,and the temperatures corresponding to the maximum combustion reaction rates were 106°C earlier and 27°C later than that of lignite,respectively.The ignition temperature and burnout temperature of rape straw were lower than those of lignite,while the activation energy in the combustion process was higher than that of lignite,and the frequency factor was much higher than that of lignite.