文献类型：期刊文献

中文题名：加压条件下褐煤的热解和氧迁移行为研究

英文题名：Study on pyrolysis and oxygen migration behavior of lignite under pressurized conditions

作者：张佩云[1];焉海波[1];王杰[1]

机构：[1]华东理工大学资源与环境工程学院,上海200030

年份：2024

卷号：30

期号：S02

起止页码：141

中文期刊名：洁净煤技术

外文期刊名：Clean Coal Technology

收录：CSTPCD;;北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

语种：中文

中文关键词：褐煤;加压热解;焦油;气体;脱氧

外文关键词：lignite;pressurized pyrolysis;tar;gases;deoxygenation

摘要：利用加压固定床反应器进行了玉溪褐煤和哈密褐煤的慢速热解,考察压力对主要气体释放速率、主要产物分布和焦油组成以及氧迁移的影响。研究发现,在0.1~1 MPa,增大压力使CO_(2)和气态烃产率提高,玉溪褐煤的变化更明显,其主要原因是增大压力能够增强焦油的二次裂解反应,但H_(2)和CO产率下降,其主要原因可能在于增大压力有利于促进体积缩小的加氢和CO积碳反应;二次裂解反应的增强致使焦油产率下降,但焦油中轻质烃类化合物数量和比例增多;升高压力使褐煤中氧元素更多以CO_(2)和水的形式逸出,转移至焦炭和焦油中的氧比例下降。
The slow pyrolysis was carried out by using a pressurized fixed-bed reactor for Yuxi lignite and Hami lignite to investigate the influence of pressure on the release rate of main gases,the distribution of main products,the composition of tar,and the transformation of oxygen element to the main products.Result showed that in the range pressure range of 0.1-1 MPa,elevating pressure promoted the yields of CO_(2)and gaseous hydrocarbons,and this result was more noticeable for Yuxi lignite.The reason for this result was the intensified secondary cracking reactions.But the yields of H_(2)and CO decreased with the elevation of pressure,and this was probably due to the volumeshrinking hydrogenation reaction and carbon deposition reaction of CO favored under elevated pressure.While elevating pressure led to the reduction of tar due to the intensified secondary cracking reactions,the number and proportion of lignite hydrocarbon compounds in the tar increased.Moreover,elevating pressure was beneficial to the deoxygenation of both char and tar,and more oxygen element was liberated in the form of CO_(2)and H_(2)O.