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借助煤炭地下气化模拟实验系统,采用富氧空气/水蒸气两阶段气化方法完成内蒙煤的地下气化实验,获取残留煤焦。采用SEM、FTIR、低温氮气物理吸附仪对煤焦的表面形貌、官能团和孔结构特性进行表征,通过淋滤实验研究煤焦对焦化废水的吸附,进而考察煤焦的吸附性能。结果表明,气化后残焦表面较为粗糙,有明显的孔隙裂隙,且保留部分含氧官能团;气化残焦的比表面积和孔容积分别达到133.87 m~2/g和0.118 cm~3/g,远大于原煤的20.19 m~2/g和0.045 cm~3/g;气化残留煤、焦对焦化废水均具有一定的净化作用,内蒙煤对TOC的脱除率随淋滤时间延长逐渐增大至62.8%,氨氮脱除率则逐渐减小至23.45%;残焦对废水中氨氮的脱除率也随时间延长而减小,但对有机污染物具有更高的吸附性能,TOC脱除率保持在70%以上。
With the coal underground gasification simulation experimental system, the underground gasification experiment of Inner Mongolia coal was completed by the oxygen-enriched air / steam two-stage gasification method to obtain the residual coal char. The surface morphology, functional groups and pore structure of coal char were characterized by SEM, FTIR and cryogenic nitrogen physical adsorption. The adsorption of coal char on coking wastewater was studied by leaching experiment, and then the adsorption properties of coal char were investigated. The results show that the surface of residual coke after gasification is rough with obvious pore fissures and some oxygen - containing functional groups are retained. The specific surface area and pore volume of gasification residual coke are 133.87 m 2 / g and 0.118 cm 3 / g respectively , Which is much larger than that of raw coal (20.19 m 2 / g and 0.045 cm 3 / g). The residual coal gasification and coke-on-coking wastewater all have a certain purification effect. The removal rate of TOC from coal in Inner Mongolia increases gradually with leaching time To 62.8%, ammonia nitrogen removal rate decreased to 23.45%; residual coke removal of ammonia nitrogen in wastewater also decreased with time, but higher adsorption of organic pollutants, TOC removal Rate remained above 70%.