Combustion and reaction

Combustion Characteristics and NO Emissions during Co-Combustion of Coal Gangue and Coal Slime in O2/CO2 Atmospheres

  • PENG Hao ,
  • WANG Baofeng ,
  • LI Wenxiu ,
  • YANG Fengling ,
  • CHENG Fangqin
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  • Institute of Resources and Environmental Engineering, Engineering Research Center of CO2 Emission Reduction and Resource Utilization - Ministry of Education of the People’s Republic of China, Shanxi University, Taiyuan 030006, China

Online published: 2023-11-28

Supported by

This work was financially supported by National Natural Science Foundation of China-Shanxi coal based low carbon joint fund (U1610254) and Natural Science Foundation of Shanxi Province (201901D111006). The authors also thank Professor Dongke Zhang of the University of Western Australia.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Abstract

Coal slime has low ash content, and adding coal slime during coal gangue combustion may have influence on combustion character; and at this process, NO will emit, and lead to environmental pollution. O2/CO2 atmosphere is conducive to NO emission reduction. Thus combustion characteristics and NO emissions during co-combustion of coal gangue and coal slime in O2/CO2 atmospheres were studied. The results showed the addition of coal slime increased the combustion activity of the mixed fuels in both air and O2/CO2 atmospheres. During co-combustion, there are synergistic effects between them at the fixed carbon combustion stage, and higher blending ratio of coal slime leads to stronger synergistic effect. Furthermore, this study also showed that with the increasing of coal slime blending ratio, the emission concentration of NO increases gradually; with the increase of temperature and O2 concentration, the NO emission concentration also gradually increases, and higher O2 concentration leads to shorter time required for the complete release of NO. Besides that, the results also demonstrate that the proportion of pyrrole and nitrogen oxide in the ashes increases with the increase of combustion temperature, and pyridine and quaternary nitrogen gradually disappear, while the total nitrogen content in ash decreases with the increase of temperature. The results will contribute to a better understanding of the co-combustion process of coal gangue and coal slime in O2/CO2 atmosphere, and provide basic data for the practical industrial application of coal gangue and slime.

Cite this article

PENG Hao , WANG Baofeng , LI Wenxiu , YANG Fengling , CHENG Fangqin . Combustion Characteristics and NO Emissions during Co-Combustion of Coal Gangue and Coal Slime in O2/CO2 Atmospheres[J]. Journal of Thermal Science, 2023 , 32(1) : 457 -467 . DOI: 10.1007/s11630-022-1742-2

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