内蒙煤UCG煤焦的物化特性及其对焦化废水的净化

发布时间：2018-03-24 21:45

本文选题：煤炭地下气化　切入点：煤焦　出处：《工程热物理学报》2017年01期

【摘要】：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。
[Abstract]:With the help of the coal underground gasification simulation system, the underground gasification experiment of Inner Mongolia coal was carried out by using the oxygen-enriched air / water vapor two-stage gasification method, and the residual char was obtained. The surface morphology of coal char was obtained by means of SEMX FTIRand low temperature nitrogen physical adsorption instrument. The properties of functional groups and pore structures were characterized and the adsorption of coke to coking wastewater was studied by leaching experiments. The results showed that the surface of residual coke was rough and there were obvious pore cracks after gasification. The specific surface area and pore volume of gasified residual coke were 133.87 mm2 / g and 0.118 cm / g, respectively, which were much larger than those of raw coal (20.19 mg / g and 0.045 cm ~ 3 / g). Gasification of residual coal and coke had certain purifying effect on coking wastewater, and the specific surface area and pore volume of residual coke were 133.87 mm2 / g and 0.118 cm / g, respectively, which were much larger than those of raw coal (20.19 mg / g and 0.045 cm / g). The removal rate of TOC from Inner Mongolia coal increased to 62.8 with the increase of leaching time, while the removal rate of ammonia nitrogen decreased to 23.45.The removal rate of ammonia nitrogen from waste water also decreased with the prolongation of time. However, the removal rate of TOC was over 70% for organic pollutants.
【作者单位】：河南理工大学化学化工学院;平煤神马集团首山焦化有限公司;河南省焦作市环境监测站;
【基金】：国家自然科学基金(No.51174077,No.51404098) 教育部博士学科点专项科研基金(No.20124116110002) 河南省国际科技合作项目(No.152102410047)
【分类号】：TD84;X784

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