以煤粉炉、循环流化床(CFB)锅炉和钢铁烧结机3种典型来源的干法脱硫灰为研究对象,采用扫描电子显微镜、全自动色差计、X射线粉末衍射、X射线荧光光谱、热失重分析仪等手段分析其形貌特征、化学组成及热稳定性。结果表明,3种干法脱硫灰是由脱硫反应产物、未反应吸收剂和粉煤灰组成的一类含水率低、粒径小的一般工业固废,与常见的钙类矿物理化特性相近。但3种典型脱硫灰的理化性质也存在明显差异:钢铁烧结机源的脱硫灰粉体松散细腻,白度最高,粒径分布最窄,平均孔径最小,比表面积最大,主要组分为半水亚硫酸钙和碳酸钙;CFB锅炉源脱硫灰粒径分布最广,D₉₀达到了45.80 μm,有更为明显的颗粒触感,吸油值最小;煤粉炉源脱硫灰平均粒径最大,粉煤灰含量最高。这些差异与烟气来源、脱硫工艺密切相关,为干法脱硫灰综合利用的规范化和标准化提供了依据。

Three kinds of typical dry-method desulfurization ash respectively from pulverized coal furnace,circulating fluidized bed boiler and iron/steel sintering machine are studied.Their morphological characteristics,chemical composition and thermal stability are analyzed by means of scanning electron microscope,automatic color difference meter,X-ray powder diffraction,X-ray fluorescence spectrum and thermogravimetric analyzer.It is shown that three kinds of ashes belong to general industrial solid wastes with low moisture content and small particle size,which are composed of desulfurization products,unreacted absorbents and fly ash,and their physical and chemical properties are similar to those of common calcium minerals.There are obvious differences in the physical and chemical properties of three typical desulfurization ashes.The ash from iron/steel sintering machine has the highest whiteness and the narrowest particle size distribution,and its main components are calcium sulfite hemihydrate and calcium carbonate;The ash from circulating fluidized bed boiler has the widest particle size distribution with a D90 of 45.8 μm,more obvious particle touch and the minimum oil absorption value.The ash from pulverized coal boiler source has the largest average particle size,and the highest content of fly ash.These differences are closely related to the source of flue gas and desulfurization process.

陈露露(1995-),女,硕士生,研究方向为固废资源化,1135248737@qq.com