燃料化学学报（中英文）2025，Vol.53Issue(6)：848-862,15.DOI:10.3724/2097-213X.2024.JFCT.0034
不同变质程度炼焦煤胶质体结构的演化及其与焦炭热强度的关系
Evolution of the plastic phase structure in metallurgical coals with different metamorphic degrees and its relationship with coke thermal strength
任贺涛 1孔令学 2白进 2李文 2庞亮 3白宗庆 2代鑫 4李东涛 4赵满祥 5侯郁洁 1陈娟 1郭振兴2
作者信息
- 1. 中国科学院山西煤炭化学研究所煤炭高效低碳利用全国重点实验室,山西太原 030001||中国科学院大学,北京 100049
- 2. 中国科学院山西煤炭化学研究所煤炭高效低碳利用全国重点实验室,山西太原 030001
- 3. 迁安中化煤化工有限公司,河北唐山 064400
- 4. 首钢集团有限公司技术研究院绿色可循环钢铁流程北京市重点实验室,北京 100049
- 5. 北京首钢股份有限公司迁顺技术中心,河北唐山 064400
- 折叠
摘要
Abstract
The study on the plastic phase structure during coking process is crucial for a deeper understanding of the relationship between coal quality and coke strength.In this work,a semi-automatic plastic layer analyzer was used to conduct pyrolysis coking experiments.The different plastic stage samples of four metallurgical coals,including Wuguantun(WGT)gas coal,Qianjiaying(QJY)fat coal,Lvjiatuo(LJT)coking coal,and Tangshan(TS)1/3 coking coal were obtained by quenching method.The microscopic structures of plastic phase samples were characterized by the combination of Fourier Transform Infrared Spectroscopy(FT-IR),X-ray Diffraction(XRD),Raman Spectroscopy and Solid-State Nuclear Magnetic Resonance(13CNMR).Based on the microscopic characterization,the relationship between the raw metallurgical coal structure,plastic phase structure and the coke thermal strength was discussed.The results demonstrated that with the generation,developing and solidification of the plastic phase,the length or branching degree of aliphatic side chains(CH2/CH3)decreased,the aromatic hydrogen ratio(fHar)and the degree of aromatic ring condensation(DOC)increased.During the evolution of the plastic phase to coke,the interlayer spacing of graphite(d002,a)gradually decreased,while the stack height(Lca),number of layers(N)and diameter of microcrystalline layers(La)increased.From the viewpoint of carbon skeleton evolution,a decrease in the content of defective carbon(AD1/AG)and an increase in the content of graphite carbon(AG/Aall)were found during coking.The 13CNMR structural parameters indicated a continuous decrease in the content of aliphatic carbon(fal)and the average chain length of methylene(Cn),while the content of aromatic carbon(far)and the content of aromatic bridgehead carbon(xb)continually increased.QJY and TS had longer fatty side chain lengths or shorter branching degrees,moderate DOC and smaller graphite interlayer spacing.At the same time,they had thicker stack heights,smaller microcrystalline layer diameters,lower defect carbon content and high graphite carbon content,lower aliphatic carbon content and higher aromatic carbon content.These two metallurgical coals exhibited continuous changes in various chemical structural parameters during the plastic stage,this means that their molecular functional group structure,microcrystalline structure,graphitized structure,and carbon skeleton structure could maintain stable evolution,which is beneficial for enhancing coke thermal strength.LJT had excessively long fatty side chain lengths(CH2/CH3:2.96)and higher stacking layers(N:6.30),its microcrystalline structure collapsed during the solidification of plastic stage,resulting in a worse coke thermal strength.WGT had a low degree of aromatic ring condensation(DOC:0.07),large graphite interlayer spacing and microcrystalline layer diameter(d002,a:3.82 Å,La:26.26 Å),thin stacking height(Lc,a:20.26 Å)and high defect carbon content(AD1/AG:2.91).Its graphitized structure collapsed during the solidification of the plastic stage,resulting in the lowest thermal strength of its coke.关键词
炼焦煤/胶质体/微观结构/焦炭热强度Key words
metallurgical coal/plastic phase/microstructure/coke thermal strength分类
化学工程引用本文复制引用
任贺涛,孔令学,白进,李文,庞亮,白宗庆,代鑫,李东涛,赵满祥,侯郁洁,陈娟,郭振兴..不同变质程度炼焦煤胶质体结构的演化及其与焦炭热强度的关系[J].燃料化学学报（中英文）,2025,53(6):848-862,15.
