摘要
在5 kW鼓泡流化床实验装置上,利用床层压差和温度的变化作为判断床层粘结失流的依据,以小麦秸秆成型颗粒作为研究对象,进行了燃烧温度、床料粒径和流化风速对失流时间影响的实验研究。实验结果表明:失流时间随着燃烧温度上升而缩短;流化风速增大,失流时间增长;床料粒径对失流时间影响不明显。对粘结物进行了SEM/EDX和XRF分析,分析结果表明,Si和K元素形成的熔融物对床料的粘结起重要的作用。
Wheat stalk was combusted in a 5 kW fluidized bed combustor to investigate the formation of bed agglomeration. Bed defluidization was determined by on-line measured bed temperatures and pressures. Tests under different combustion conditions were made to study the influence of temperature, gas velocity and bed particle size on agglomeration. Scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM/EDX) and X-ray fuorescence (XRF) were applied to identify agglomerates. The temperature is the most important facts on the agglomeration. The defluidization time is decrease with the temperatures increase; the higher gas velocity can extend the defluidization time; the bed particle size has no influence on the defluidization time. The SEM/EDX and XRF analysis shows that K and Si play the most important roles in bed defluidization by forming low melting point compounds.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第3期511-514,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.50706055)
关键词
秸秆
流态化
粘结
失流
straw
fuidization
agglomeration
defluidization