The fine slag produced from the entrained flow gasifier in coal chemical industry contains a high amount of unburned carbon content, which can reach more than 40%. The coal gasification fine slag is dissipated just by land filling which occupies a lot of land. Consequently, it causes the pollution of soil, water and wastes the combustible carbon in coal gasification fine slag. It is crucial to develop an environmental friendly and economical scheme for the utilization of coal gasification fine slag. To achieve this aim, it is significant to investigate the combustibility of coal gasification fine slag and then propose a comprehensive utilization technology. In this study, the physical and chemical properties of the raw bituminous coal and the produced coal gasification fine slag, including proximate and ultimate analysis, particle size distribution, ash composition, morphology, and specific area were investigated. The combustion and co-combustion characteristics of coal gasification fine slag were analyzed by a thermo-gravimetric analyzer. A drop tube furnace and a fluidized bed reactor were employed to test the combustibility of coal gasification fine slag in a pulverized furnace and a fluidized bed furnace, respectively. Results show that the carbon content in dried coal gasification fine slag is >40% with a heating value > 16 MJ kg⁻¹. Further, thermo-gravimetric analyzer test showed that the combustion property of coal gasification fine slag is worse than that of anthracite and close to that of high ash coal, and there is a non-negligible synergistic effect for raw bituminous coal and coal gasification fine slag co-firing. The combustibility test in drop tube furnace and fluidized bed reactor showed that coal gasification fine slag can be well burned in a pulverized furnace requiring combustion temperature >900 °C and oxygen concentration >10 vol%. However, the fluidized bed furnace was not appropriate for high efficiency coal gasification fine slag burning, because the unburned carbon content of fly ash after coal gasification fine slag combustion is still >14%, even at 900 °C, 21% oxygen concentration and a low fluidization number. It is suggested that coal gasification fine slag will be better to burned it in a pulverized furnace rather than fluidized furnace.

煤化工行业中的气流床气化炉产生的细渣含有大量未燃烧的碳，可达到40％以上。煤气化细渣仅通过占地很多的填埋而被消散。因此，它会污染土壤，水，并浪费煤气化细渣中的可燃碳。开发利用环保，经济的方案来利用煤气化细渣至关重要。为此，研究煤气化细渣的可燃性，提出综合利用技术具有重要意义。在这项研究中，对原始烟煤和所产生的煤气化细渣的物理和化学性质，包括近似分析和最终分析，研究了粒度分布，灰分组成，形态和比表面积。用热重分析仪分析了煤气化细渣的燃烧和燃烧特性。采用滴管炉和流化床反应器分别测试了粉化炉和流化床炉中煤气化细渣的可燃性。结果表明，干气化细渣中的碳含量> 40％，热值> 16 MJ kg 采用滴管炉和流化床反应器分别测试了粉化炉和流化床炉中煤气化细渣的可燃性。结果表明，干气化细渣中的碳含量> 40％，热值> 16 MJ kg 采用滴管炉和流化床反应器分别测试了粉化炉和流化床炉中煤气化细渣的可燃性。结果表明，干气化细渣中的碳含量> 40％，热值> 16 MJ kg^-1。此外，热重分析仪试验表明，煤气化细渣的燃烧性能比无烟煤差，接近高灰分煤，对原始烟煤和煤气化细渣的协同作用不可忽略。共烧。在落管炉和流化床反应器中的可燃性测试表明，煤气化细渣可以在需要燃烧温度> 900°C和氧气浓度> 10 vol％的粉化炉中很好地燃烧。但是，流化床炉不适用于高效煤气化细渣燃烧，因为即使在900°C，21％的氧气浓度和90％的氧气浓度下，煤气化细渣燃烧后的粉煤灰未燃烧碳含量仍> 14％。低流化数。