热解温度对生物质焦理化特性的影响  

Effect of pyrolysis temperature on the chemical physical characteristics of biomass char

作　　者：王学斌[1] 许伟刚[1] 靳维新 张利孟[1] 王新民[1] 谭厚章[1] 

机构地区：[1]西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室,陕西西安710049 [2]新疆西部天富合盛热电有限公司,新疆石河子832000

出　　处：《燃料化学学报》2013年第1期74-78,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(50976086)

摘　　要：利用SEM、BET及TGA对在873、1 073和1 273 K下制得的麦秆焦的理化特性进行分析,进行了用制得的麦秆焦还原NO的实验,同时考虑了焦样及NO初始浓度对该反应的影响,得出了热解温度对麦秆焦的各种物理化学特性及其与NO反应活性的影响。结果表明,1 073 K焦样的孔隙特征最为发达,燃烧活性最高,并对应最高的NO还原效率。焦作用下NO的还原率随着焦样浓度的增大线性升高,而随着初始NO浓度的增大呈幂函数的规律下降。不同热解温度下麦秆焦样与NO的反应均在1 173 K附近存在动力学控制和扩散控制的转折温度;在动力学控制的反应温度范围内,热解温度对麦秆焦与NO反应活化能的影响不大(89.78～95.41 kJ/mol),其中,NO浓度项和焦浓度项的反应级数分别为0.89和1.00。The straw pyrolysis chars obtained at 873, 1 073 and 1 273 K were investigated with SEM, BET and TGA to conduct the characterization. The reduction of NO by different straw chars was investigated, with considering the effects of char concentration Cchar and NO concentration CNO, tO analyze the effect of pyrolysis temperature on the chemical physical characteristics of biomass char. The results show that straw char obtained at 1 073 K holds the most developed pore structure and surface area, the best combustion activity, and the highest NO reduction rate. As the char concentration increases, NO reduction rate linearly increases. As the NO concentration increases, NO reduction rate decreases as a power-function relation. At the transition temperature about 1 173 K the char-NO reaction changes from dynamic-control region to diffusion-control region. In the dynamic-control region, the pyrolysis temperature affects the activation of the char-NO reaction inconspicuously. The reaction orders for NO and straw char are found to be 0.89 and 1.00, respectively.

关 键 词：生物质 焦 热解温度 活化能 

分 类 号：TK6[动力工程及工程热物理—生物能]