O_2/CO_2气氛下煤焦燃烧过程中碳官能团演化行为研究  

Evolution of Carbon Functionality During Coal Char Combustion in O_2/CO_2 Atmosphere

作　　者：张永春[1] 张军[1] 盛昌栋[1] 刘杨先[1] 赵亮[1] 丁启忠[1] 王坤[1] 

机构地区：[1]东南大学能源与环境学院,江苏省南京市210096

出　　处：《中国电机工程学报》2011年第2期27-31,共5页Proceedings of the CSEE

基　　金：国家自然科学基金国际合作交流项目(507211460649)~~

摘　　要：利用X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)研究大同烟煤及其煤焦中碳的赋存形态;同时对大同煤焦在O2/CO2和O2/Ar气氛下燃烧过程中含碳官能团的演化规律进行研究,揭示燃烧气氛中CO2对碳转化过程的影响。结果表明,大同煤中的碳主要以芳香碳和脂肪碳的形式存在,在热解过程中,其含量降低,而酚碳、羰基和羧基含量增加。O2/CO2煤焦燃烧过程中,芳香碳和脂肪碳含量不断减少,酚碳、羰基和羧基含量则逐渐增加,其中酚碳含量增加最为显著。燃烧气氛中CO2的存在,加快了芳香碳和脂肪碳的减少,促进了酚碳、羰基和羧基的形成。X-ray photoelectron spectroscopy（XPS） was used to investigate the carbon functional forms present in Datong bituminous coal and its chars.The evolution of carbon functionalities during char combustion in O2/CO2 and O2/Ar atmospheres were also studied.Results indicate that aromatic and aliphatic carbon was the dominant carbon functionalities in coal.Coal pyrolysis resulted in decreases in the levels of aromatic and aliphatic species but increases in the levels of phenolic,carbonyl and carboxyl species.During char combustion in O2/CO2 atmosphere the aromatic and aliphatic species decrease with burn-off while phenolic,carbonyl and carboxyl groups increase.The CO2 gasification has an obvious effect on the evolution of carbon functionalities.

关 键 词：煤焦 燃烧 O2/CO2气氛 碳官能团 X射线光电子能谱 

分 类 号：TK16[动力工程及工程热物理—热能工程]