煤热解过程中无机有害元素的变迁规律  

Transformation of Na, K, Pb and Mn During Pyrolysis of 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,太原030001

出　　处：《环境科学》2002年第5期100-104,共5页Environmental Science

基　　金：国家重点基础研究发展规划项目 (G19990 2 2 10 2 ) ;国家杰出青年科学基金项目 (2 972 5 6 14 )

摘　　要：在自行设计的加压密闭快速热解反应器中研究了神华和义马煤中Na、K、Pb和Mn等无机有害元素在氮气条件下随温度 (3 0 0℃～ 70 0℃ )的变化规律 ,进一步考察了热解气氛 (氮气、氢气和二氧化碳 )、压力对神华煤中这4种元素逸出规律的影响 .结果表明 :Na、K、Pb和Mn等元素在半焦中的残留量随温度的升高而减少 ,减少量随煤种而异 ,如在 70 0℃时 ,神华煤中Na、K、Pb和Mn的析出率分别是义马煤的 3、4 2、1 4和 2 4倍 ;低压快速加氢热解有利于这 4种元素的逸出 .Pb是挥发性最强的元素 ,与热力学计算结果一致 .Transformation of Na、K、Pb and Mn in char for Shenhua and Yima coals at pyrolysis temperatures of 300℃～700℃ was reported. Effects of atmosphere (N 2, H 2 and CO 2) and pressure on release of the elements in Shenhua coal were also studied. The pyrolysis experiment was carried out in a closed stainless steal reactor. Results show that the bleeding ratio of Na, K, Pb and Mn varied with coal type but all increased with pyrolysis temperature. For example, the bleeding ratio of Na, K, Pb and Mn at 700℃ for Shenhua coal was 3, 4 2, 1 4, and 2 4 times larger than that of Yima coal. The effect of pressure was small. Among the N 2, H 2 and CO 2 environments, H 2 resulted in the highest bleeding ratio and CO 2 the least bleeding ratio. Thermodynamic calculation shows that Pb was the most volatile element among the four inorganic harmful elements.

关 键 词：煤 热解过程 无机有害元素 变迁规律 

分 类 号：X132[环境科学与工程—环境科学]