富氧条件下温度对煤焦结构中官能团和孔隙结构变化影响的实验研究  

Experimental Study on Effect of Temperature on Changes of Functional Groups and Pore Structure in Coal Char Structure under Oxygen-enriched Condition

作　　者：高晨[1] 鄢晓忠[1] 许龙泉[1] GAO Chen;YAN Xiao-zhong;XU Long-quan(School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China)

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410114

出　　处：《煤炭技术》2018年第7期301-304,共4页Coal Technology

摘　　要：以典型贵阳贫煤为研究对象,利用管式炉获取贵阳煤在富氧条件(氧浓度为24%)燃烧过程中不同温度下的煤焦样,用FTIR方法、氮气低温吸附法和SEM等多种手段研究其在燃烧过程中不同阶段煤焦官能团和孔隙结构的演化情况。结果表明:贵阳煤中存在羟基、脂肪族、含氧官能团等多种基团,随着燃烧温度的上升,煤焦中羟基和脂肪族相对含量降低,含氧官能团中醚键相对含量上升;贵阳煤具有较连续的完整孔系统,在燃烧过程中孔的形状和结构不断变化,煤焦比表面积和小孔数量经历一个先增大后减小的过程。Taking the typical lean coal in Guiyang as the research object, the coal tar samples of Guiyang coal at different temperatures during the oxygen enrichment （oxygen concentration of 24%） were obtained by tube furnace, the FTIR method, nitrogen cryogenic adsorption method and SEM were used to study the evolution of coal-based functional groups and pore structures in different stages of the combustion process. The results showed that there are many groups of hydroxyl, aliphatic and oxygen- containing functional groups in the coal of Guiyang, with the increase of combustion temperature, the relative content of hydroxyl and aliphatic in coke decreased, and the relative content of ether bond in oxygen-containing functional groups increased. Guiyang coal had a continuous complete pore system, the shape and structure of pores changed constantly during combustion, the specific surface area of coal char and the number of pores increased at first and then decreased.

关 键 词：煤焦 FTIR 官能团 燃烧过程 

分 类 号：TQ534.2[化学工程—煤化学工程]