氧体积分数对木质和玉米秸秆燃烧特性的影响  

Effect of volume fraction of oxygen on combustion characteristics of wood pellets and corn stalks

作　　者：彭好义[1] 姚昆[1] 蒋绍坚[1] 王育青[1] 彭福来[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《热科学与技术》2014年第1期61-66,共6页Journal of Thermal Science and Technology

基　　金：中央高校基本科研业务费专项研究资助项目(2010QZZD0106);"可再生能源电力技术"湖南省重点实验室基金资助项目(2011KFJJ002)

摘　　要：采用TG-DTG-DSC联用技术对木质颗粒和玉米秸秆颗粒的燃烧特性进行了实验,考察了在不同含氧气氛中两种生物质的可燃特性、着火特性、燃烧稳定性、燃尽特性及综合燃烧特性的影响,计算了燃烧动力学参数。结果表明:随着氧体积分数的增大,两种生物质的着火温度和燃尽温度降低,燃烧稳定性判别指数、可燃性指数和综合燃烧特性指数增大;木质颗粒的着火温度和前期燃尽指数高于玉米秸秆,后期燃尽指数低于玉米秸秆,木质颗粒比玉米秸秆颗粒更难热分解,氧气体积分数对玉米秸秆颗粒燃烧特性影响要大于木质颗粒;生物质在低温阶段的活化能要大于高温阶段的活化能,两阶段的活化能随着氧气体积分数的增大而减小。Thermo gravimetric experiments of corn stalks and wood pellets were performed by using TG-DTG-DSC thermal analysis technology. The effect of oxygen concentration on combustible characteristics,ignition characteristics,combustion stability characteristics,burn-out characteristics and synthetic combustion characteristics were discussed,and the combustion kinetics parameters were identified.Results show that with increase of oxygen concentration the ignition temperature,burn-out temperature decreased,the j udgement index of combustion stability,the combustible characteristics index and synthetic combustion characteristics index increased;the ignition temperature and the prophase burn-out characteristics index of wood pellets are higher than that of corn stalks,the later burn-out characteristics index is smaller than corn stalks,the wood pellets are more difficult to pyrolysis than corn stalks,the combustion characteristics of corn stalks is evidently affected by oxygen content.The corresponding reaction activation energy is larger at the low temperature phase than that at high temperature phase,the reaction activation energy of two stage decrease with increase of oxygen concentration.

关 键 词：氧气体积分数 生物质 燃烧特性 动力学 

分 类 号：TK6[动力工程及工程热物理—生物能]