摘要
研究相近煤阶中的镜质组在热解过程中的相互作用有利于深入认识煤的炭化成焦机理,可为完善配煤理论和炭化机理提供实验基础和理论依据。选用相近煤阶的唐山和鹤岗1/3焦煤为试样,富集纯化的镜质组按照不同比例混合炼焦,采用TG、XRD、SEM考察所得焦炭气化反应性、微晶结构及表面形貌的变化。研究表明,随着TS镜质组含量的增加,焦炭的最大气化速率(DTG_(max))呈现先降低后增高的趋势,2种镜质组在炭化过程中存在相互作用,基于速率差值提出以交互作用因子(α)表征相互作用的程度(α=4.93%)。XRD和SEM分析结果表明TS∶HG=1∶1配煤时所得焦炭的石墨化程度更高,焦炭表面形貌相对光滑,晶格缺陷较少。2种煤的镜质组在热解中的相互作用可促进焦炭中微晶的生长,焦炭微晶结构更加有序,抵御CO_(2)侵蚀能力更强。
The study on the interaction of vitrinites wth similar coal ranks during the pyrolysis process is beneficial for a better understanding of the coking mechanism of coals,which could provide experimental and theoretical basis for improving coal blending theory and carbonization mechanism.The vitrinites in Tangshan(TS)and Hegang(HG)1/3 coking coals with similar ranks were enriched,and then mixed in different proportions to coking.The gasification reactivity,microcrystalline structure and surface morphology of the coke were investigated by TG,XRD and SEM.The results show that the maximum gasification rate(DTG_(max))of the coke decreases first and then increases with the increase of TS vitrinite content,and the TS an HG vitrinites have interaction with each other during coking process.Based on the difference in the gasification rate,an interaction factor(α)is proposed to characterize the degree of interaction(α=4.93%).The results of XRD and SEM analysis show that the graphitization degree of coke derived from TS∶HG=1∶1 coal blending is higher,and the surface morphology of coke is relatively smooth and the lattice defects are less.Therefore,the interaction between the two vitrinites during pyrolysis processes could promote the growth of microcrystals of coke,and the microcrystalline structure of coke is more orderly,which could lead to the stronger ability to resist CO_(2)erosion for cokes.
作者
罗云红
刘超雷
李金泽
孙章
LUO Yunhong;LIU Chaolei;LI Jinze;SUN Zhang(College of Chemical Engineering,North China University of Science and Technology,Tangshan 063210,China)
出处
《煤质技术》
2025年第3期12-18,共7页
Coal Quality Technology
基金
国家自然科学基金煤炭联合基金资助项目(U1361212)。
关键词
镜质组
成焦过程
石墨化程度
焦炭气化反应性
微晶结构
表面形貌
交互作用因子
vitrinite
interaction
graphitization degree
gasification reactivity
microcrystalline structure
surface morphology
degree of interaction
