摘要
为能更接近实际情况下研究煤粉/玉米芯混燃动力学特性,改造热重分析设备,改变其只能逐步升温的方法,使其具备在指定温度下检测样品反应动力学的功能。研究不同掺混比、不同温度、不同煤种等对煤粉/玉米芯混燃动力学的影响规律。通过可失重额余量随时间的变化曲线,进行燃烧动力学影响因素分析。结果表明:煤粉与玉米芯在恒温条件下混燃不像逐步升温下那样会明显分为4个阶段,而是无明显的阶段性;玉米芯掺混比例越大,活化能越小,燃烧越剧烈,试样的平均失重速率越大,燃烬时刻提前。温度对混燃的影响存在一段作用不明显的温度区间,在此区间外,温度越高,活化能越小,试样失重速率越大,燃烬时刻越提前;不同煤种/玉米芯混燃,呈现出较大差异。玉米芯对含挥发分较少相对难燃的煤种促进燃烧和燃烬的效果较明显,对含挥发分较多相对易燃的煤种促进作用相对较弱。
The combustion kinetics characteristics of pulverized coal/corncob were studied by means of a modified thermogravimetrie analyzer that can permit the samples to be tested at pointed temperatures. The effects of blending ratio, temperature and coals on the kinetics were studied. And, theory analysis and some conclusions were done through curves of sample weight loss. One is not like that happened through method of increased temperature gradually there are four stages exiting, the stages are not clear at isothermal temperature, although the same TGA; the more corncob blending ratios the less activation energy and the greater average weight loss rate and the earlier the burnout time. There is a temperatures range that the effect of temperature on the kinetics characteristics is not obvious, however, the higher the temperature the smaller the activation energy and the earlier the burnout time when temperatures excess this range. Kinds of coal also play an important role in determine the combustion characteristics for coal/corncob blends. The effect of corncob that promotes coal burning and burnout become more obvious with less volatile coal.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2014年第3期413-420,共8页
Acta Energiae Solaris Sinica
基金
中央高校基本科研业务费专项资金(13MS92)
关键词
热重
玉米芯
煤
混燃
动力学
thermogravimetric
corncob
coal
blended combustion
kinetics
