With the widely application of entrained-flow coal gasification technology in China's coal chemical industry,the production of coal gasification fine slag is increasing year by year.At present,the resource utilization of gasification fine slag has become one of the difficult problems in the treatment of solid waste in coal chemical industry.In this paper,gasification fine slag with different carbon con-tents and its separated carbon-rich residues were selected as the research objects.The structural parameters such as composition,pore structure and microstructure were analyzed.The gasification reactivity of coal gasification fine slag under CO2 atmosphere was investigated based on thermogravimetric analyzer.The gasification reaction kinetics was analyzed by iso-conversional method,and the internal relation-ship between the structural characteristics of coal gasification fine slags and its carbon-rich residues and their gasification reactivity was re-vealed.The results show that the pore structure is the key factor affecting the gasification reactivity of gasification fine slag and its separa-ted carbon-rich residues,and the samples with developed pore structure have higher gasification reactivity.With the increase of heating rate in gasification process,the gasification reaction range of gasification fine slag and its carbon-rich residues shiftes to high temperature.In addition,the gasification reaction activation energy of gasification fine slag and carbon-rich residues with relatively high fixed car-bon content decreases with the increase of conversion rate,while the gasification reaction activation energy of gasification fine slag and car-bon-rich residues with high ash content of the sample itself increases with the increase of conversion rate.The research results provide the-oretical guidance for the resource utilization of gasification fine slag and its separated carbon-rich residues.
coal gasification fine slagcarbon-rich residuespore structureheating rategasification reactivitykinetic analysis
维普
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