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OALib Journal期刊
ISSN: 2333-9721
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富氧燃烧烟气中石灰石微粒团聚结构稀薄气体效应分析
, PP. 31-36
Keywords: 富氧燃烧,脱硫石灰石,团聚,稀薄气体效应,分形
Abstract:
针对富氧燃烧烟气中石灰石硫化产物层内的稀薄气体效应现象，在低co2浓度低温(750℃)条件下，以平均粒径31.4μm石灰石颗粒为样品，利用tga、sem、压汞仪等设备，采用精密探针进行局部破碎方法，获取石灰石颗粒内部微观结构，研究产物层内的稀薄气体效应及气态反应物的扩散规律。结果表明:石灰石颗粒由大量微粒团聚而成，微粒间孔隙尺寸分布在5～1000nm范围内，且<50nm的孔隙所占比例>75%；理论分析可知，孔隙中稀薄气体效应随温度、压力会发生变化，随着压力增大，气体扩散状态会由自由分子流区向连续介质区过渡；计算得到so2气体分子在石灰石直接硫化产物层内的扩散系数，不同分形维数的孔径对应不同的扩散系数在0.0162～0.1259cm2/min之间。
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