热处理条件对大同煤中微量有害元素变迁规律的影响  

INFLUENCE OF THERMAL TREATMENT CONDITIONS ON TRANSFORMATION OF TRACE ELEMENTS IN DATONG COAL

作　　者：郭瑞霞[1] 杨建丽[1] 刘东艳[1] 刘振宇[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《化工学报》2003年第11期1603-1607,共5页CIESC Journal

基　　金：国家重点基础研究发展规划项目(No G19990 2 2 10 2 );国家自然科学基金(No 90 2 10 0 3 4)资助项目~~

摘　　要：在自行设计的加压密闭热解反应器中研究了大同煤中As、Pb、Cr、Cd和Mn等微量有害元素在氮气条件下随温度 ( 30 0～ 70 0℃ )、压力 ( 0 1～ 4MPa)和停留时间的变化规律 ,同时也考察了热解气氛 (氮气和氢气 )的影响 .结果表明 :这 5种元素的析出率均随热解温度的升高而升高 ,随停留时间的延长而增大 ;反应压力的升高抑制了微量元素的释放 ;长停留时间 ,氢气气氛有利于微量元素的挥发 ;热解过程中As和Cd较其他Transformation of As, Pb, Cr, Cd and Mn in Datong coal during pyrolysis was studied. The pyrolysis experiment was carried out in a closed stainless steel reactor. The effects of temperature (300-700°C), pressure (0.1-4 MPa), and residence time under nitrogen atmosphere on the release of the trace elements were investigated. The influence of reaction atmosphere (N2 or H2) on the emission of the trace elements was also investigated. Results showed that the release of As, Pb, Cr, Cd and Mn increased with increasing pyrolysis temperature and residence time. Higher pressure inhibited the release of the trace elements. H2 environment resulted in a higher release of the trace elements. In the temperature range studied, As and Cd showed higher volatility than the other three elements during pyrolysis.

关 键 词：煤 热解 微量元素 反应条件 

分 类 号：TQ530.2[化学工程—煤化学工程]