化工学报 ›› 2003, Vol. 54 ›› Issue (11): 1603-1607.

• 能源和环境工程 • 上一篇    下一篇

热处理条件对大同煤中微量有害元素变迁规律的影响

郭瑞霞;杨建丽;刘东艳;刘振宇   

  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
  • 出版日期:2003-11-25 发布日期:2003-11-25

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

GUO Ruixia;YANG Jianli;LIU Dongyan;LIU Zhenyu   

  • Online:2003-11-25 Published:2003-11-25

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(300~700℃)、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3种元素表现了较强的挥发性.

关键词:

煤, 热解, 微量元素, 反应条件

Abstract: 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℃ ),pressure(0.1—4MPa),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.

Key words:

煤, 热解, 微量元素, 反应条件