木基和竹基生物质燃料燃烧动力学特性研究  

Kinetics study of the fuel combustion of wood and bamboo biomass

作　　者：陈国华[1] 李运泉[1] 彭浩斌 李越胜 江志铭 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]广东省特种设备检测研究院顺德检测院,广东顺德528300

出　　处：《可再生能源》2015年第10期1535-1540,共6页Renewable Energy Resources

基　　金：广东省省部产学研合作专项资金项目(2013B090500111)

摘　　要：选用木基和竹基生物质燃料进行燃烧热重实验，分段推断其燃烧反应机理及拟合计算动力学参数，探究燃烧动力学特胜随温度变化规律。结果表明：木基生物质燃料着火温度、燃尽温度、挥发分析出燃烧最大速率及其对应温度均低于竹基生物质燃料，焦炭燃烧阶段前者的燃烧速率大于后者；木基生物质燃料挥发分析出燃烧初期（260～280℃）和过渡阶段（360～440℃）燃烧反应机理为三维扩散机理（G11），挥发分析出燃烧及焦炭燃烧最大速率前后的机理函数不相一致，竹基生物质燃料整个燃烧反应过程可用同一机理函数描述。挥发分析出燃烧阶段，木基生物质燃料活化能随温度按“增加一下降增加—下降”变化，竹基生物质燃料则先增加至峰值后下降。Combustion mechanisms and kinetic parameters were investigated for wood and bamboo biomass by thermogravimetric analysis. The results of TG analysis have shown that ignition point, burnout temperature, the maximum rate of decomposition and combustion as well as its corresponding temperature of wood biomass are lower than bamboo biomass, and the combustion rates of char for wood samples are higher than bamboo samples. In order to find out the mechanisms responsible for the combustion of these two biomass samples under different temperatures, 15 combustion mechanisms were tested using non-isoconversional method. The results of the non-isoconversional method show that three-dimensional diffusion mechanism （G1 t） is the most effective mechanism for the initial stage （260-280 ℃） and the transition phase （360-440 ℃） of wood biomass, while there is some difference compared to other regions. However, Gl1 mechanism was found to be the main mechanism for all regions of bamboo biomass. The evaluation of the kinetic constants for these samples with application of Coats-Redfern method. The activation energy related to wood samples changed following the rules of increase-down-increase-down as the temperature grown, while declined after reaching a peak for bamboo samples.

关 键 词：木基生物质 竹基生物质 热重分析 燃烧机理 反应动力学 

分 类 号：TK6[动力工程及工程热物理—生物能] S216.2[农业科学—农业机械化工程]