镜质组变质程度对泡沫炭孔结构和抗压强度的影响

发布时间：2018-11-22 10:42

【摘要】：为了研究镜质组富集物的变质程度对泡沫炭孔结构和抗压强度的影响,以气煤、肥煤和焦煤的镜质组富集物为前驱体,采用高压渗氮法制备煤基泡沫炭。利用扫描电子显微镜观察断面形貌,用偏光显微镜统计孔胞直径分布和孔壁厚度分布,采用长春万能材料试验机检测泡沫炭的抗压强度。结果表明:随着镜质组富集物变质程度的提高,泡沫炭的抗压强度增大;气孔率高、孔壁薄、孔壁真密度低,则泡沫炭的抗压强度低。镜质组富集物的胶质层指数和奥亚膨胀度越大,形成泡沫炭孔胞越大,且分布不均匀。镜质组富集物的黏结指数越低及干燥无灰基挥发分越高的镜质组形成的泡沫炭孔壁真密度越低,反之亦然。
[Abstract]:In order to study the influence of metamorphism of vitrinite enrichment on pore structure and compressive strength of foamed carbon, coal-based foamed carbon was prepared by high-pressure nitriding method with vitrinite enrichment of gas coal, fat coal and coking coal as precursor. The section morphology was observed by scanning electron microscope (SEM), the pore cell diameter distribution and pore wall thickness distribution were calculated by polarizing microscope, and the compressive strength of foamed carbon was tested by Changchun universal material testing machine. The results show that the compressive strength of foamed carbon increases with the increase of metamorphic degree of vitrinite enrichment, and the compressive strength of foamed carbon is low with high porosity, thin pore wall and low true density of pore wall. The larger the glial layer index and the degree of Oberon expansion of vitrinite enrichment, the larger the foamed carbon pore cell is and the more uneven the distribution is. The lower the adhesion index of vitrinite enrichment and the lower the wall density of foamed carbon pores formed by vitrinite with higher volatile content of dry ash free group, and vice versa.
【作者单位】：辽宁科技大学化工学院辽宁省先进煤焦化技术及煤资源高效利用工程研究中心;
【基金】：辽宁省自然科学基金(20170540470) 辽宁科技大学专项基金(601009816-30),辽宁科技大学重大科研平台开放课题(USTLKFZD 201638) 大学生创新基金(DC2016117)
【分类号】：TB383.4;TQ127.11

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