不同粒径气化细渣残炭结构及燃烧特性研究  

Study on Structure and Combustion Characteristics of Gasification Fine Slags Carbon Residues with Different Particle Sizes

作　　者：张忠翼 赵代胜 李寒旭[2] 汪伦 Zhang Zhongyi(CHN ENERGY Investment Group Co.,Ltd.,Beijing 100011)

机构地区：[1]国家能源投资集团有限责任公司,北京100011 [2]安徽理工大学化学工程学院,淮南232001

出　　处：《化工设计》2023年第5期14-20,1,共8页Chemical Engineering Design

摘　　要：气流床煤气化技术的广泛应用带来了气化灰渣的大量排放,易引起一系列安全环境问题,细渣中残炭含量较高,造成煤炭的极大浪费,因此,对气化细渣及残炭的详细研究具有十分重要的意义。本文通过粒径筛选和酸洗的方法得到不同粒径级的气化细渣及气化细渣残炭,利用粒度分析仪、SEM-EDS及Raman全面表征不同粒径渣颗粒残炭的形貌及结构特征,采用热重分析研究其燃烧特性。结果表明:细渣的粒度分布具有多峰集聚性,100μm以上的细渣残炭含量最高,因在气化炉内经历不同的气化历程形成了形态各异的细渣颗粒;中间粒径渣颗粒残炭有序度更高,且随着粒径增大,细渣颗粒残炭的着火温度、燃尽温度无较大波动,峰值温度与综合燃烧指数呈先增大后略下降的趋势。本研究为进一步认识细渣残炭、实现细渣残炭回收资源化利用提供理论基础。The widespread application of entrained flow coal gasification technology has led to a large amount of emissions of gasification residue ash,which can easily cause a series of safety and environmental issues.The high content of residual carbon in the fine slag causes great waste of coal.Therefore,detailed research on gasification fine slag and residual carbon is of great significance.This paper uses particle size screening and acid washing methods to obtain gasification fine slag and gasification fine slag residual carbon of different particle sizes.The morphology and structural characteristics of slag particle residual carbon with different particle size are comprehensively characterized by using particle size analyzer,SEM-EDS and Raman.The combustion characteristics are studied by using thermogravimetric analysis.The results indicate that the particle size distribution of the fine slag exhibits multi peak agglomeration,and the content of residual carbon of fine slag above 100μm is the highest,as different forms of fine slag particles are formed through different gasification processes in the gasifier.The degree of order of residual carbon of slag particles in the middle particle size is higher,and as the particle size increases,there is no significant fluctuation in the ignition temperature and burnout temperature of fine particle residual carbon.The peak temperature and comprehensive combustion index show a trend of first increasing and then slightly decreasing.This study provides a theoretical basis for further understanding fine residue and residual carbon,and achieving the recycling and resource utilization of fine residue and residual carbon.

关 键 词：气化细渣 粒径 残炭 燃烧特性 

分 类 号：TQ546[化学工程—煤化学工程]