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<p>The use of syngas as a fuel in gas turbines, as an alternative to conventional natural gas, is an appealing option due to the diverse methods of syngas and its clean combustion characteristics. This study compares the effects of two distinct syngas compositions, derived from coal gasification, on the combustion characteristics in a Moderate or Intense Low-oxygen Dilution (MILD) model combustor. The dynamic pressure characteristics and pollutant emissions of CO/H<sub>2</sub>/N<sub>2</sub> mixtures with two different ratios at various adiabatic flame temperatures were experimentally measured under ambient temperature and pressure conditions. Simultaneously, flame images and OH* images captured by an image-enhanced high-speed camera were utilized to characterize the reaction zone within the combustion chamber. The results demonstrate that, under the experimental operating conditions, a wide range of stable combustion can be achieved in the MILD model combustor. Proper Orthogonal Decomposition (POD) analysis of the OH* images uncovered the presence of a motion pattern distinct from that of hydrocarbon fuel combustion. This suggests that the alteration in fuel species induces substantial changes in the flame dynamics, which subsequently influences the flame’s response to the combustion chamber’s acoustic field. Moreover, when the adiabatic flame temperature ranged from 1400 K to 2000 K, the NO<sub><i>x</i></sub> and CO emissions from syngas combustion were maintained below 10×10<sup>−6</sup> @15% O<sub>2</sub>.</p>

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Experimental Study on the Effect of Fuel Component Ratio on the Combustion Characteristics of Syngas in a MILD Model Combustor

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Ningjing Yang,
  • Yan Xiong,
  • Zhigang Liu,
  • Xiang Xu

摘要

The use of syngas as a fuel in gas turbines, as an alternative to conventional natural gas, is an appealing option due to the diverse methods of syngas and its clean combustion characteristics. This study compares the effects of two distinct syngas compositions, derived from coal gasification, on the combustion characteristics in a Moderate or Intense Low-oxygen Dilution (MILD) model combustor. The dynamic pressure characteristics and pollutant emissions of CO/H2/N2 mixtures with two different ratios at various adiabatic flame temperatures were experimentally measured under ambient temperature and pressure conditions. Simultaneously, flame images and OH* images captured by an image-enhanced high-speed camera were utilized to characterize the reaction zone within the combustion chamber. The results demonstrate that, under the experimental operating conditions, a wide range of stable combustion can be achieved in the MILD model combustor. Proper Orthogonal Decomposition (POD) analysis of the OH* images uncovered the presence of a motion pattern distinct from that of hydrocarbon fuel combustion. This suggests that the alteration in fuel species induces substantial changes in the flame dynamics, which subsequently influences the flame’s response to the combustion chamber’s acoustic field. Moreover, when the adiabatic flame temperature ranged from 1400 K to 2000 K, the NOx and CO emissions from syngas combustion were maintained below 10×10−6 @15% O2.