Abstract The carbon content in fine slag during entrained-flow gasification is very high, at present, most of the fine slag was disposed by landfill. It is expected to provide a favorable technology by adding the fine slag to the circulating fluidized bed boilers to participate in combustion reaction. In this study, the gasification fine slags generated from GE, OMB and GSP gasifier, which are typical gasification processes in Ningdong energy and chemical base, was selected for investigation. The structural features and combustion reactivity of the residual carbon in the gasification fine slag were systematically studied by physical adsorption apparatus, laser Raman spectrum and thermogravimetric analyzer. The results showed that the materials in the original gasification fine slag could be divided into cohesive spherical particles, porous irregular particles and isolated large spherical particles, while the acid-washed gasification fine slag was mostly composed of loose fine particles and porous irregular massive particles. Additionally, the particle size of the residual carbon was clustered to 4–8 nm, and the specific surface area and active sites of that decreased orderly as follows: GE>OMB>GSP. The order degree of the residual carbon structure in GE slag was the lowest, and the amorphous carbon structure in it was the highest, while the case in GSP was the opposite. The combustion rate of the residual carbon in GE slag was the fastest, mainly due to its large specific surface area, more amorphous carbon structure and active site, and the comprehensive combustion index of residual carbon in GE slag was 5.26×10−7 %2/(min2·°C3).

中文翻译：

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气流床气化细渣中残碳的结构特征及燃烧反应性

摘要 气流床气化过程中细渣中的碳含量很高，目前大部分细渣通过填埋处理。将细渣加入循环流化床锅炉参与燃烧反应，有望提供一种有利的技术。本研究选取宁东能源化工基地典型气化工艺GE、OMB和GSP气化炉产生的气化细渣进行调查研究。采用物理吸附仪、激光拉曼光谱和热重分析仪系统研究了气化细渣中残碳的结构特征和燃烧反应性。结果表明，原气化细渣中的物质可分为粘性球形颗粒、多孔不规则颗粒和孤立的大球形颗粒，而酸洗气化细渣主要由疏松细颗粒和多孔不规则块状颗粒组成。此外，残留碳的粒径聚集在4~8 nm，其比表面积和活性位点依次减小，GE>OMB>GSP。GE渣中残余碳结构有序度最低，其中无定形碳结构有序度最高，而GSP则相反。GE渣中残碳的燃烧速度最快，主要是由于其较大的比表面积、较多的无定形碳结构和活性位点，GE渣中残碳综合燃烧指数为5.26×10−7 %2 /(min2·°C3)。