生物质流化床气化反应过程数值模拟  

Numerical Simulation of Biomass Gasification in Fluidized Bed

作　　者：郭飞强[1] 董玉平[1] 景元琢 董磊 

机构地区：[1]山东大学机械工程学院,济南250061 [2]山东百川同创能源有限公司,济南250101

出　　处：《农业机械学报》2013年第4期127-130,183,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：'十二五'国家科技支撑计划资助项目(2011BAD15B05);'十一五'国家科技支撑计划资助项目(2010BAC66B02);山东大学研究生自主创新基金资助项目(31360071613057)

摘　　要：建立了二维生物质流化床气化炉模型,模型包括气相质量、动量和能量守恒,热解过程动力学采用一步反应模型,气固均相与非均相反应采用物质输送模型,重点考察了颗粒在炉内的运动和热解气化过程,分析了温度和当量比对燃气组分的影响,并对模拟结果与实验结果进行对比验证。结果表明:颗粒在炉内的运行时间约为2.15 s,0.8 s左右时颗粒进入稳定的流化环境;CO2和CH4摩尔分数沿y轴方向逐渐将低,而CO和H2摩尔分数沿y轴方向不断增加。在不同温度和当量比条件下,模拟所获得的H2、CO、CH4和CO2摩尔分数与实验结果具有良好的一致性。A 2-D model of fluidized bed was developed to study biomass particles gasification. Mass, momentum and energy conservations of gas were considered. Biomass particles pyrolysis was based on a one-stage mechanism, and species transport mechanism was developed for homogeneous and heterogeneous reactions of gas and solid. The particle motion, gasification and effects of temperature and equivalent ratio on gas composition were investigated, and the results were compared with experimental results. The results showed that the total time of the particles in gasifier was about 2. 15 s, and particles fluidization became stable in 0. 8 s. The mole fractions of CO2 and CH4 decreased along y axial, while CO and H2 had the opposite trend. Under different temperatures and equivalent ratios, the simulation mole fractions of H2 , CO, CH4 and CO2 agreed sufficiently well with the experimental dates.

关 键 词：生物质 颗粒 热解气化 数值模拟 

分 类 号：TK6[动力工程及工程热物理—生物能]