中文摘要：

摘要通过实验室地下气化模型实验，研究了褐煤及其气化灰渣中Pb和As的含量及其分布，探讨了其在气化过程中的迁移和富集特性。结果表明，两种元素在气化灰渣中都有一定含量的分布，只是迁移规律不同。Pb在气化过程中易富集在灰渣中，而As是挥发性元素，在灰渣中的含量较少。但在三个气化反应区两种元素又有大致相同的分布规律，即温度最低的干馏干燥区两种元素含量均最高.

英文摘要：

The content and distribution of As and Pb in raw coal and gasification residues were studied and the migration and enrichment of them were discussed during the process of underground coal gasification（UCG）. The results showed that there were distribution of As and Pb in the residues of the three reaction zones, but the transformation characteristics of them were different. Pb tended to concentrate in the gasification residues while As was volatile element so the content of it in the residues was far lower than that in raw coal. However, on the whole, the two elements had the similar distribution in the residues of the three reaction zones that was the contents of them were highest in the lowest temperature zone.