水热提质对木屑燃烧特性和热分解特性的影响  

Influence of hydrothermal upgrading on characteristics of combustion and thermal decomposition from sawdust

作　　者：李田[1] 赵培涛[1,2] 黄能[1] 袁隆基[1] 祝飞[1] Li Tian Zhao Peitao Huang Neng Yuan Longji Zhu Fei(Sehool of Eleetrie Power Engineering, China University of Mining and Technology, Xuzhou 221116, China National Engineering Research Center of Coal Preparation and Purification, Xuzhou 221116, China)

机构地区：[1]中国矿业大学电气与动力工程学院,江苏徐州221116 [2]国家煤加工与洁净化工程技术研究中心,江苏徐州221116

出　　处：《可再生能源》2016年第12期1868-1876,共9页Renewable Energy Resources

基　　金：中央高校基本科研业务费专项基金(2015QNA15);江苏省自然科学基金(BK20150174)

摘　　要：水热处理有效解决了其它热转化技术中湿物料的脱水和干燥问题,避免了复杂的干燥和昂贵的分离程序。文章以松木屑为原料,利用水热技术对其进行提质,研究松木屑在不同水热提质温度提质后的燃烧特性和热分解特性。结果表明:随着水热提质温度的升高,燃烧反应的峰值提前,燃烧温度区间变大,燃烧速率变小,热解残留量增多;水热提质温度为260℃时,木屑的平均燃烧反应速率由0.111 min-1降至0.105 min-1,降幅为38.2%;热解残留量为0.54,是原木屑残留量(0.24)的2.25倍。动力学分析表明:水热提质温度低于240℃时,燃烧反应为二级反应;水热提质温度为260℃时,为一级燃烧反应,木屑的燃烧反应趋于简单,活化能显著降低,燃烧性能得以改善;随水热提质温度的升高,热解反应趋于复杂。水热提质有助于稳定木屑燃烧过程,有利于燃烧过程优化控制。文章的研究结果可为高含水、低能量密度生物质的高效利用提供借鉴。The hydrothermal treatment is effective to solve the problems of dehydration and drying of wet materials in other thermal conversion technologies, which avoids the complicated drying and expensive separation process. The pine sawdust was used as raw material to investigate hydrothermal upgrading at different hydrothermal temperatures on the pyrolysis properties and combustion characteristics. The results show that with the increase of hydrothermal temperature, the peak value of combustion reaction advances and combustion temperature range becomes wide, while the combustion reaction rate declines and the yield of pyrolysis residue increases. At a hydrothermal temperature of 260 ℃, the average combustion reaction rate was reduced from 0.111 min^-1 to 0.105 min^-1, decreasing by 38.2%, while the yield of pyrolysis residue was 0.54, which is 2.25 times as much as the yield of original sawdust residue （0.24）. The dynamic analysis shows that at the hydrothermal temperatures below 240 ℃, the combustion could be expressed by the second-order reactions together with Arrhenius equation, whereas when the hydrothermal temperature is 260 ℃, the combustion reaction became simple with lower reaction order and activation energy, implying the improvement of the combustion performance. All the results indicate that the hydrothermal upgrading is beneficial to stabilize the combustion of sawdust and realize the optimization of the combustion process, providing the valuable reference for the efficient utilization of wet and low-energy-density biomass.

关 键 词：生物质 水热提质 热重分析 燃烧特性 热解特性 活化能 

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]