煤炭地下气化残留物中微量元素分布及富集特性  

Distribution and enrichment characteristics of trace elements during underground coal gasification

作　　者：李玉龙[1,2] 梁栋宇 盛训超 王张卿 梁杰[1,2] LI Yulong;LIANG Dongyu;SHENG Xunchao;WANG Zhangqing;LIANG Jie(School of Chemical and Environmental Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining&Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083

出　　处：《化工进展》2018年第4期1590-1598,共9页Chemical Industry and Engineering Progress

基　　金：中央高校基础科研业务费专项基金项目(2012YH01)

摘　　要：煤炭地下气化是把残留物保留在地下的煤炭原位开采技术。本文通过地下气化富氧-水气化工艺模型实验,对不同工艺条件下气化区残留物进行网格采样,并通过离子体质谱仪(ICP-MS)和原子荧光形态分析仪对残留物中的Zn、Cu、As、Pb、Cr、Ni和Hg进行定量分析,最后采用迁移率和相对富集系数对微量元素进行迁移富集特性评价。结果表明,残留物中微量元素的总量随着工艺条件中氧气浓度的增加而减少。在氧化区中Cr、Ni含量最高,Cu、Pb在三区的残留量很少,Zn在三区的残留量最多,随着氧浓度的升高,在三区的残留物呈明显的递减趋势,易于在还原区内残留;As在三区都有富集的趋势,随着氧气浓度的升高,在三区残留物的残留量有递增的趋势;由于出口气温度较高,Hg在三区的残留量最少,没有明显的规律性。气化通道残留物中微量元素Hg、As、Zn、Cr的平均含量比原煤中的含量多,而Ni、Cu、Pb比原煤中的含量少。从相对富集系数与平均残留率综合分析,Cr、Ni、Zn、As、Hg的平均相对富集系数小于1,Zn、As、Hg的残留物大于100%;Cr、Ni残留率在50%~100%。Cu和Pb三区的相对富集系数小于1,残留率小于50%。Underground coal gasification technology is a situ mining technology,leaving the produced pollutants in the ground.The grid-based sampling of gasification zone under different process conditions was carried out by oxygen-water gasification model test.The residue of content of zinc,arsenic,lead,chromium,nickel and mercury was analyzed by inductively coupled plasma mass spectrometry(ICP-MS)and atomic fluorescence spectrometry.Finally,the migration and enrichment coefficients were used to evaluate the migration and enrichment characteristics of trace elements.Results showed that the total amount of trace element residues decreases with the increase of oxygen concentration of the process conditions.In the oxidation zone,the residual amount of chromium and nickel was very high.The residual amount of copper and lead in the three regions was very low.The residual amount of zinc in the three regions was the highest,and the residual amount decreases with the increase of oxygen concentration in the three regions,and is easy to remain in the reducing area.Arsenic is enriched in three regions,and its residuals increase with the incresase of oxygen concentration in three regions.Due to the higer temperature at the outlet,the residual amount of mercury in the three areas was the least,and there was no obvious regularity.The average content of trace elements Hg,As,Zn and Cr in the residue of gasification channel was much higher than that in raw coal,while that of nickel,copper and lead was less than that of raw coal.By the method of the relative enrichment factor and the average residual ratio analysis,it is carried out that the relative enrichment factors of Cr,Ni,Zn,As,Hg are all less than 1.The residual rates of Zn,As and Hg are more than 100%.Cr and Ni are from 50%to 100%.The relative enrichment factors of Cu and Pb in three regions are less than 1.The residual rates are less than 50%.

关 键 词：煤炭地下气化 残留物 微量元素 分布 富集 

分 类 号：TH3[机械工程—机械制造及自动化]