高碱煤热转化过程中钠的释出特性实验研究
Experimental study on sodium release characteristics during thermal conversion of high-alkali coal
廖伟辉 1饶勇 1吕兴城 1阮志龙 1傅勇强 2李华鸿 2陈端 3马帅 3姚斌 3赵永椿3
作者信息
- 1. 广东红海湾发电有限公司,广东 汕尾 516000
- 2. 湛江中粤能源有限公司,广东 湛江 524000
- 3. 华中科技大学能源与动力工程学院,湖北 武汉 430074
- 折叠
摘要
为研究高碱煤热转化过程中钠的释出特性,采用原煤和水萃取煤分别进行燃烧实验和热解实验来对比分析高碱煤和低碱煤中钠的释出特性,探究不同煤质的煤样在燃烧时煤样中不同赋存形态钠的释出特性变化以及气氛变化对钠释出的影响.结果表明:在进行燃烧实验时,高碱煤在300～500 ℃时钠的释出量增加缓慢,在500～1 100 ℃时钠的释出量增加较快,低碱煤在300～500 ℃时钠的释出量增加较快,在500～1 100 ℃时钠的释出量增加缓慢,由此可知煤质是影响钠释出的主要原因之一,钠的释出特性会因煤质中成分差异而受到较大影响;燃烧和热解2种不同气氛下钠释出特性相似,热解过程中钠释出率变化平缓,且热解过程中钠释出率会比燃烧过程低7.0％左右;有机钠和水溶性钠2种不同赋存形态钠因释出途径不同而导致释出特性有所差异.
Abstract
In order to study release characteristics of sodium during thermal conversion of high-alkali coals,the release characteristics of sodium in high-sodium coal and low-sodium coal were compared and analyzed through combustion experiments and pyrolysis experiments of raw coal and water-washed coal,so as to explore the release law changes of different forms of sodium in coal samples during combustion and the influence of atmosphere changes on sodium release.The results show that,during the combustion experiment,the release of sodium from high-alkali coal increases slowly at 300～500 ℃ and rapidly at 500～1 100 ℃,and the release of sodium from low-alkali coal increases rapidly at 300～500 ℃ and slowly at 500～1 100 ℃.It can be seen that,coal quality is one of the main reasons affecting sodium release,and sodium release will be greatly affected by the difference in coal composition.The release law of sodium during combustion and pyrolysis is basically the same,the sodium release rate changes slowly during the pyrolysis process,and is about 7.0％lower than that of the combustion process.The release characteristics of organic sodium and water-soluble sodium are different due to different release routes.
关键词
高碱煤/钠释出/赋存形态/燃烧/热解Key words
high-alkali coal/sodium release/occurrence form/combustion/pyrolysis引用本文复制引用
基金项目
国家重点研发计划项目(2022YFB4202000)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据