文献类型：期刊文献

中文题名：煤热解及煤焦气化和煤焦低温氧化过程的原位拉曼光谱研究

英文题名：Study on pyrolysis of coal,gasification and low temperature oxidation of coal char by in-situ Raman spectroscopy analysis

作者：余俊钦[1];张铭露[1];胡靖涵[1];王钦超[1];卿海杰[1];韩啸[1];丁路[2];于广锁[2]

机构：[1]中国核动力研究设计院先进核能技术全国重点实验室,成都610213;[2]华东理工大学洁净煤技术研究所,上海200237

年份：2025

卷号：48

期号：3

起止页码：81

中文期刊名：煤炭转化

外文期刊名：Coal Conversion

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金项目(21878093);中国核动力研究设计院技术基础项目(JSZL2021201A001)。

语种：中文

中文关键词：煤气化;热解;低温氧化;原位拉曼光谱;碳结构

外文关键词：coal gasification;pyrolysis;low temperature oxidation;in-situ Raman spectrum;carbon structure

摘要：固体结构表征是揭示煤热化学转化反应机理的重要手段,目前对煤热化学转化过程中固体结构的原位表征研究较为缺乏。采用原位拉曼光谱仪研究了单颗粒煤热解、煤焦气化和煤焦低温氧化过程中碳结构的演变特性。结果表明:在煤热解过程中,煤大分子结构经历裂解和芳环融合两个阶段,裂解阶段大量侧链基团断裂,芳环融合阶段分子尺寸增大。在煤焦气化过程中,煤焦的面积收缩率随粒度增大而减小,煤焦气化导致碳结构的石墨化演变,且石墨化演变随粒度增大而延迟。在煤焦低温氧化过程中,反应前中期(碳转化率X<60%)含氧结构的形成导致煤焦的碳结构有序度降低,随非晶碳结构的消耗,碳基体的碳微晶结构逐渐趋于有序,在反应后期未反应碳形成高度有序的类石墨结构。
Solid structure characterization is an important approach to reveal mechanism of thermochemical conversion of coal.At present,in-situ characterization research on solid structure in thermochemical conversion process of coal is relatively lacking.In this study,carbon structure evolution during pyrolysis of single coal particle,gasification and low temperature oxidation of coal char was studied by the in-situ Raman spectrometer.The results show that macromolecular of coal go through two stages of pyrolysis and aromatic ring fusion during coal pyrolysis.A large number of side chain groups are broken in pyrolysis stage,and molecular size increases in aromatic ring fusion stage.During coal char gasification,area shrinkage ratio of coal char decreases with the increase of particle size.Coal char gasification leads to graphitization evolution of carbon structure,and graphitization evolution is delayed with the increase of particle size.The formation of oxygen-containing structure in early and middle stages of low temperature oxidation of coal char results in the decrease of carbon structure graphitization degree.With consumption of disordered carbon structure,carbon microcrystalline structure of carbon matrix gradually tends to be ordered,and unreacted carbon forms highly ordered graphite-like structure at the late stage.