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利用XRD、Raman、XPS和FT-IR表征技术,研究无机酸洗脱(HCl、H2SO4、HCl-HF)处理的胜利褐煤微晶结构的变化,采用自行设计的表面吸附仪-GC联用装置,对样品进行不同温度的低温脉冲氧化实验,考察了煤样在不同温度下氧吸附量的变化规律,通过低温脉冲氧吸附规律与TG/DTG和固定床燃烧实验关联,考察了煤样的自燃倾向。结果表明,无机酸洗脱对矿物质的脱除使得煤结构的有序度增加,石墨化程度提高,无机酸洗脱煤样与原煤相比吸氧量明显下降。随着吸附温度的升高,各煤样吸氧量明显增加,且随着脱除矿物质程度的增加,吸氧量呈减小的趋势,导致自燃倾向降低。
XRD, Raman, XPS and FT-IR characterization techniques were used to study the changes of the microstructure of Shengli lignite treated with inorganic acid (HCl, H2SO4 and HCl-HF). The surface adsorption- The samples were subjected to low temperature pulse oxidation experiments at different temperatures. The variation of oxygen adsorption amount under different temperatures was investigated. Through the correlation between low temperature pulse oxygen adsorption and TG / DTG and fixed bed combustion experiments, the spontaneous combustion tendency . The results show that the removal of minerals by inorganic acid leads to an increase in the degree of ordering of coal structure and the degree of graphitization. The amount of oxygen absorbed by inorganic acid-washed coal samples is significantly lower than that of raw coal. With the increase of adsorption temperature, the oxygen absorption of each coal sample increased obviously, and with the removal of minerals increased, the oxygen absorption decreased with the decrease of spontaneous combustion tendency.