摘要
为研究炼焦煤焦化过程中碳结构及交联结构的演变机理,选择了观音堂焦煤、马头焦煤、五沟肥煤、萧县肥煤、兖州西气煤5种不同变质程度的煤样进行焦化试验。对制得的煤焦样品按照600、700、800、900、1000℃进行取样,结合XRD、Raman分析手段分析不同温度区间焦化产物的碳结构和交联结构的变化规律以及演变机制。结果表明,平均横向尺寸(L_(a))与芳香度(f_(a))均随温度升高逐渐增大,堆积高度(L_(c))与片层数(N_(ave))随温度升高逐渐减小,层间距(d_(002))逐渐减小,但变化较小。说明炼焦煤微晶结构的演变规律是横向尺寸的伸长和纵向堆叠高度的降低且伴随芳香度升高。发现Raman带面积比A_(D)/A_(G)、A_(D)/A_(all)、A_(S)/A_(G)随温度升高整体增大。A_(D)/A_(G)、A_(S)/A_(G)在900~1000℃下增幅较平缓,A_(GR+VL+VR)/A_(D)随温度升高整体呈下降趋势。相关性分析结果显示L_(a)和A_(D)/A_(all)、A_(S)/A_(G)呈正相关关系,L_(a)与A_(GR+VL+VR)/A_(D)呈负相关关系。说明微晶结构尺寸变化与交联结构形成关系密切。
The evolution mechanism of carbon structure and cross-linking structure during coal coking was investigated.Five coal samples,Guanyintang coking coal,Matou coking coal,Wugou fat coal,Xiaoxian fat coal and Yanzhou West gas coal,were selected for coking experiments.The coking products were sampled according to 600,700,800,900 and 1000℃,and the changes of carbon structure and crosslinking structure of the coking products in different temperature intervals were analyzed by combining XRD and Raman characterization methods.It is found that the average lateral size(L_(a))and aromaticityf_(a)both increased gradually with increasing temperature,the stacking height(L_(c))and the number of layers(N_(ave))decrease gradually with increasing temperature,and the interlayer spacing(d_(002))decreases gradually overall,but the change in value is small.This suggests that the evolution of the coking coal microcrystalline structure is characterized by an increase in lateral size and a decrease in longitudinal stacking height accompanied by an increase in aromaticity.It is found that the Raman band area ratios A_(D)/A_(G),A_(D)/A_(all),A_(S)/A_(G)show an overall increasing trend with increasing temperature.Moreover,A_(D)/A_(G)and A_(S)/A_(G)increase more gently at temperatures from 900℃to 1000℃,and A_(GR+VL+VR)/A_(D)show an overall decreasing trend with increasing temperature.The results of correlation analysis show that L_(a)show positive correlation with A_(D)/A_(all)and A_(S)/A_(G),and L_(a)show negative correlation with A_(GR+VL+VR)/A_(D).This suggests that changes in the size of the microcrystalline structure are closely related to the formation of the cross-linking structure.
作者
戚悦昕
田露
徐秀丽
许恒光
窦金孝
余江龙
QI Yuexin;TIAN Lu;XU Xiuli;XU Hengguang;DOU Jinxiao;YU Jianglong(Key Laboratory for Advanced Coal and Coking Technology of Liaoning Province,University of Science and Technology Liaoning,Anshan 114051,China;Sinosteel Anshan Research Institute of Thermo-Energy Co.,Ltd.,Anshan 114044,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S01期111-119,共9页
Clean Coal Technology
基金
国家自然科学基金资助项目(22078141,22378180)
辽宁省“揭榜挂帅”科技计划(重点)资助项目(2022JH1/10800065)
辽宁省自然科学基金资助项目(2022-MS-354)
关键词
炼焦煤
碳结构
交联结构
相关性分析
coking coal
carbon structure
cross-linking structure
correlation analysis
作者简介
戚悦昕(1999—),男,河北张家口人,硕士研究生。E-mail:a19977277@163.com;通讯作者:窦金孝(1986—),男,山东临朐人,副教授,博士。E-mail:doujx123@163.com;通讯作者:余江龙(1965—),男,安徽安庆人,教授,博士。E-mail:jianglongyu@163.com
