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<p>The coal chemical industry is the promising way to consume the large number of low-rank coal in China, whose by-products are semi-coke and residual carbon (RC) with low volatile and high ash contents. The technique of oxy-fuel co-combustion is the potential way to consume these low-volatile carbon-based solid fuels (LVCSFs), which could promote the large-scale CO<sub>2</sub> reduction and carbon neutrality for coal-fired power plants. However, the co-gasification features of various LVCSF blends at initial stage under oxy-fuel condition are still vague, which are further investigated in the present. Rise of temperature could enhance the fuel-nitrogen release of 50% SMS/50% FRC blend under tiny oxygen condition, and the reducing atmosphere could lead to the decrease of nitrogen gas (X-N) yield in 50% SMS/50% CRC blend. The CH<sub>4</sub> yields of SMS and RCs both increase first and then decline with the increasing residual carbon proportions. The rising O<sub>2</sub> content in O<sub>2</sub>/CO<sub>2</sub> atmosphere could lead to the declines of X-N yields in blends owing to the enhancement of reducing atmosphere. The X-N yields of SMS/CR blends show different trends with the oxygen concentration raised in O<sub>2</sub>/CO<sub>2</sub>/N<sub>2</sub> atmosphere, especially rising firstly and then reducing in SMS/CRC blend with the increased O<sub>2</sub> content. It could be contributed to the ultra-low-volatile content of CRC and its slow release. The NO<sub>2</sub> is the main product of X-N during co-gasification process of blend under the O<sub>2</sub>/CO<sub>2</sub>/N<sub>2</sub> condition.</p>

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Co-gasification characteristics of various low-volatile carbon-based solid fuel blends at initial co-combustion stage under oxy-fuel condition

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Chaowei Wang,
  • Chang’an Wang,
  • Dangqi Xu,
  • Xiaolei Jing,
  • Honggang Liu,
  • Fan Fang,
  • Xiang Ma,
  • Defu Che

摘要

The coal chemical industry is the promising way to consume the large number of low-rank coal in China, whose by-products are semi-coke and residual carbon (RC) with low volatile and high ash contents. The technique of oxy-fuel co-combustion is the potential way to consume these low-volatile carbon-based solid fuels (LVCSFs), which could promote the large-scale CO2 reduction and carbon neutrality for coal-fired power plants. However, the co-gasification features of various LVCSF blends at initial stage under oxy-fuel condition are still vague, which are further investigated in the present. Rise of temperature could enhance the fuel-nitrogen release of 50% SMS/50% FRC blend under tiny oxygen condition, and the reducing atmosphere could lead to the decrease of nitrogen gas (X-N) yield in 50% SMS/50% CRC blend. The CH4 yields of SMS and RCs both increase first and then decline with the increasing residual carbon proportions. The rising O2 content in O2/CO2 atmosphere could lead to the declines of X-N yields in blends owing to the enhancement of reducing atmosphere. The X-N yields of SMS/CR blends show different trends with the oxygen concentration raised in O2/CO2/N2 atmosphere, especially rising firstly and then reducing in SMS/CRC blend with the increased O2 content. It could be contributed to the ultra-low-volatile content of CRC and its slow release. The NO2 is the main product of X-N during co-gasification process of blend under the O2/CO2/N2 condition.