太原理工大学学报2025，Vol.56Issue(1)：25-33,9.DOI:10.16355/j.tyut.1007-9432.20230030
水煤浆循环流化床燃烧飞灰特性研究
Characteristics of Fly Ash from Coal Water Slurry Circulating Fluidized Bed Combustion
摘要
Abstract
[Purposes]The content of Al2O3 in the fly ash and slag after combustion of Zhungeer coal is over 45%,which has important value of comprehensive utilization of resources.In order to solve the problems of poor fly ash activity and low Al2O3 extraction efficiency when using Zhungeer coal in conventional circulating fluidized bed boilers,a coal water slurry circulating fluidized bed com-bustion method was proposed to improve the ash characteristics.[Methods]The effects of feed mode,operating oxygen content,bed temperature,and primary air rate on unburned combustible in fly ash were studied by using a 3 MW circulating fluidized bed combustion test facility,the composi-tion and micro-morphology of fly ash with different particle sizes were analyzed by using specific sur-face area and pore diameter analysis apparatus,scanning electron microscope,X-ray fluorescence spetrometer,and X-ray diffractometer(XRD).[Findings]The results show that the unburned com-bustible content in fly ash decreases with the increase of bed temperature,operating oxygen content,and primary air rate,and the unburned combustible content in fly ash in coal water slurry granulated combustion is obviously lower than that in ungranulated combustion.The combustibles in fly ash are mainly below 40 μm,and the unburned combustible content increases with the decrease of fly ash par-ticle size.Most of small fly ash particles were composed of undeveloped pore structure particles with high combustible content.The BET specific surface area and total pore volume decrease with the in-crease of fly ash particle size,while the average pore size increases gradually,and the total pore vol-ume and the average pore size of the slack coal slurry are smaller than those of the clean coal slurry.It can be found that the content of Al2O3 increases with the decrease of particle size,and the content of Al2O3 in fly ash with particle size less than 15 μm is 51.77%.Acctording to the phase retrieval and semi-quantitative analysis of ash samples,the γ-Al2O3 peak with higher activity is gradually weak-ened with the increase of particle size,the mullite content is gradually increased with the increase of particle size,and the aluminum extraction efficiency of fly ash decreases.As a whole,in fly ash with particle size less than 50 μm,the content of Al2O3 is higher and the content of mullite is lower,making it more suitable to be used as raw material for aluminum extraction process.关键词
准格尔煤/水煤浆/循环流化床/灰渣提铝/灰渣综合利用Key words
Zhungeer coal/coal water slurry/circulating fluidized bed/extracting aluminum from ash and slag/comprehensive utilization of ash and slag分类
化学化工引用本文复制引用
张代鑫,张国庆,刘海军,黄涌波,杜善周,樊保国,黄中..水煤浆循环流化床燃烧飞灰特性研究[J].太原理工大学学报,2025,56(1):25-33,9.基金项目
国家能源投资集团科技创新项目 （）
太原市"揭榜挂帅"项目 （）
