摘要
对新疆准东煤水煤浆气化灰渣的热值、烧失量、粒径、化学组成、孔隙结构、微观结构和燃烧特性等进行了研究,结果表明:气化细渣中热值和烧失量明显高于气化粗渣;气化粗渣和气化细渣的d 50分别为338.98μm和126.84μm;气化粗渣和气化细渣的主要化学成分均为SiO 2、Al_(2)O_(3)、CaO和Fe_(2)O_(3),主要矿相都包括非晶态硅铝酸盐和碳,并夹杂着石英、方解石等晶相;气化粗渣和气化细渣的平均孔径分别为5.68 nm和5.56 nm,比表面积分别为85.81 m^(2)/g和202.88 m^(2)/g。采用扫描电子显微镜观察发现,气化粗渣主要由块状颗粒和球状颗粒组成,而细渣主要包括不规则颗粒、球形颗粒和絮团状颗粒,并在絮团状颗粒上附着和包裹球形颗粒,其中不规则颗粒和絮团状颗粒主要由C元素构成,而球形颗粒主要以硅铝酸盐为主。热重分析结果表明,气化粗渣和气化细渣的燃烧失重率为16.81%和35.04%,综合燃烧特性指数分别为7.16×10^(-8)%2/(min^(2)·℃^(3))和1.51×10^(-7)%2/(min^(2)·℃^(3))。
In this paper,the heating value,loss on ignition,the particle size,the chemical composition,pore structure,micro-morphology and combustion characteristics of slag from gasification of Xinjiang Zhundong coal-water-slurry were studied.The results show that the heating value and loss on ignition of fine slag were obvious higher than that of coarse slag.The median diameter(d 50)of coarse slag and fine slag were 338.98μm and 126.84μm.The chemical composition of coarse slag and fine slag are similar,which are SiO_(2)、Al_(2)O_(3)、CaO and Fe_(2)O_(3).The main phase composition of both coarse slag and fine slag were amorphous silicoaluminate and carbon,which is mixed with quartz,calcite and other cystalline phase.The specific surface area and the average pore size of the fine slag were 202.88 m^(2)/g and 5.56nm,while the specific surface area and the average pore size of the coarse were 85.81 m^(2)/g and 5.68 nm.The results of SEM show that the microstructure of coarse slag were composed of blocky and spherical particles,while the microstructure of the fine slag were composed of dense blocky particles,spherical particles and flocculent particles,which the dense blocky particles and flocculent particles are mainly composed of C element,while spherical particles are mainly composed of silicoaluminate.The results of TGA showed that the combustion weight loss rate of coarse slag and fine slag were 16.81%and 34.74%,the comprehensive combustion characteristics index of coarse slag and fine slag were 7.16×10^(-8)%2/(min^(2)·℃^(3))and 1.51×10^(-7)%2/(min^(2)·℃^(3)).
作者
次东辉
CI Dong-hui(National Institute of Clean and Low Carbon Energy,Beijing,102211,China)
出处
《煤炭加工与综合利用》
CAS
2024年第7期86-93,共8页
Coal Processing & Comprehensive Utilization
基金
国家能源集团科技创新项目(GJNY-22-28):大型煤气化系统效能提升共性关键技术研究(水煤浆气化)。
关键词
煤气化
气化细渣
气化粗渣
理化性质
燃烧特性
coal gasification slag
fine slag
coarse slag
chemical compostion
combustion characteristics
