文献类型：期刊文献

中文题名：煤快速热解过程碱及碱土金属释放特性及焦理化结构演变研究

英文题名：Release characteristics of AAEMs and physicochemical structural evolution of char during rapid coal pyrolysis

作者：夏纬栋[1];余俊钦[1];丁路[1];龚岩[1];于广锁[1,2]

机构：[1]华东理工大学洁净煤技术研究所,上海200237;[2]宁夏大学煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021

年份：2022

卷号：50

期号：3

起止页码：268

中文期刊名：燃料化学学报

外文期刊名：Journal of Fuel Chemistry and Technology

收录：CSTPCD;;EI(收录号：20221411877894);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家重点研发计划政府间国际科技创新合作重点专项(2021YFE0108900);国家自然科学基金(21878093),上海市科委“一带一路”国际科技合作项目-“一带一路”青年科学家交流项目(20230742400);上海市浦江人才计划(20PJ1402800)资助。

语种：中文

中文关键词：快速热解;碱及碱土金属;释放特性;结构演变

外文关键词：rapid pyrolysis;alkali and alkaline earth metals;release characteristics;physicochemical structural evolution

摘要：本研究基于高频炉反应器开展准东煤的快速热解实验,探究碱及碱土金属(AAEMs)的释放特性及其与煤焦理化性质演变的关联。热解停留时间、气氛是影响AAEMs迁移特性及煤焦理化性质演变的重要过程参数。研究表明,AAEMs的释放率随热解停留时间的延长而增大,Na、Mg和Ca的最大释放率分别为61.05%、64.47%、44.01%。CO_(3)气氛能显著提高煤热解过程中AAEMs的释放率,CO_(3)对Na释放的促进作用主要发生在快速热解初期,而对Mg和Ca释放的促进作用主要表现在快速热解中后期。CO_(3)气氛促进挥发分释放,加快含氧官能团及脂肪族官能团分解,促进煤焦表面裂纹形成,从而促进煤快速热解过程煤中AAEMs的释放。
Rapid pyrolysis experiment of Zhundong coal was conducted in a high-frequency furnace to investigate release characteristics of alkali and alkaline earth metals(AAEMs)and its correlation with changes of physical and chemical properties of char.Residence time and atmosphere during pyrolysis were important process parameters that affected the migration characteristics of AAEMs and physicochemical structural evolution of char.Experimental results show that the release of AAEMs in coal char increases over time.The maximum release rate of Na,Mg and Ca is 61.05%,64.47%,and 44.01%,respectively.Promoting effect of CO_(3) on release of Na mainly occurs in the initial stage of rapid pyrolysis,nevertheless the promoting effect on release of Mg and Ca mainly is in the middle and late stage.CO_(3) accelerates release of AAEMs by promoting release of volatiles,facilitating decomposition of oxygen-containing functional groups and aliphatic functional groups,and promoting formation of cracks on surface of coal char.