Numerical Study of Radiation and Fuel–Air Unmixedness on the Performance of a Dry Low NOx Combustor

Wiranegara, Raditya Yudha; Igie, Uyioghosa; Ghali, Pierre; Zhao, Rang; Abbott, David; Hamilton, Richard

doi:10.1115/1.4055983

Cited by 5 publications

(8 citation statements)

References 32 publications

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“…Wiranegara et al [19] developed a combustor geometry and CFD model inspired by the M501G1 gas turbine [22]. The study presented here is to evaluate the impact of hydrogen addition on the combustor originally designed for pure natural gas application.…”

Section: Burner Under Investigation and Methodologymentioning

confidence: 99%

“…Wiranegara et al [19] generated the mesh using ICEM-CFD. A combination of tetrahedral and hexahedral meshes was used due to the complexity of the geometry in parts.…”

Section: Burner Under Investigation and Methodologymentioning

confidence: 99%

“…The air mass flow shown here is 1/4 the total air mass flow, given that only one-quarter of the can was considered. Figure 4 shows the work of the authors reported in Wiranegara et al [19] and presents a comparison with the experimental work of Ruan et al [32] on pure methane. The comparison shows radial profiles of temperature and CO2 fractions at different planes, indicating that the flame is stabilized at the CRZ, and the chamber wall is surrounded by film cooling flow.…”

Section: Figure 3 Side View Of Combustor Model With Mesh [19]mentioning

confidence: 95%

“…A commercial CFD software ANSYS Fluent 2021R1 was used for the CFD modelling, with the SIMPLE pressure-velocity coupling scheme. Also, the Realizable K-Epsilon (RKE) turbulence model was selected due to its good performance at simulating swirling flow [19][23]- [24]. GRI-3.0 [25] was adopted as the chemical kinetic mechanism and is typically more suitable for low hydrogen blends (<50vol%).…”

Section: Figure 3 Side View Of Combustor Model With Mesh [19]mentioning

confidence: 99%

“…Progress in increasing the hydrogen capability of existing engines without water of stream injection is promising, yet there is still limited analysis of hydrogen-enriched natural gas flame in practical gas turbine combustors available in the open literature. The present study specifically addresses such a gap by adopting a Mitsubishi technology-inspired combustor developed and validated, as introduced in our earlier work [19] for 100vol% methane. The behaviour of hydrogen-methane blends from 0 to 90vol% hydrogen content at high pressure in a pilot-stabilized flame at a gas turbine scale was explored in the study.…”

Section: Introductionmentioning

confidence: 99%

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Co-Firing of Hydrogen and Natural Gas in a Practical DLN Combustor Model

Zhao,

Igie,

Abbott

et al. 2023

Volume 3B: Combustion, Fuels, and Emissions

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To reduce carbon dioxide emissions, the combustion of natural gas-hydrogen blends in a lean premix gas turbine combustor has been investigated. Previous studies have mostly investigated the fuel blends at relatively low pressure (up to 5 bar) with relatively low hydrogen concentrations (up to 50vol%) on lab-scale or generic burner configurations. However, the influence of higher pressure and higher hydrogen content (over 50vol%) has not been widely studied, particularly on a practical industry-scale lean premixed burner as presented in this study. Such an operation is more challenging as it increases the turbulent flame speed gradient, which is an important factor in determining the likelihood of boundary layer flashback. A preliminary RANS-based Computational Fluid Dynamics (CFD) study has been conducted using ANSYS Fluent 2021R1, employing the Realizable K-Epsilon turbulence model and the Flamelet-Generated Manifold (FGM) combustion model. The combustor consists of a diffusion pilot and premixed main fuel nozzles. Methane-hydrogen blends of up to 90vol% hydrogen were investigated at a fixed fuel energy input. 100vol% methane at 15 bar pressure was taken as the baseline reference case. To investigate the flame characteristics, contour plots of OH mass fraction, equivalence ratios and temperatures (at different planes) are presented. This study shows that the expected reduction in the flame length with increasing hydrogen concentration occurs up to 40vol%. Significantly different flame shapes (as indicated by OH contours) were seen at higher hydrogen content. For this model, the flashback occurred at 90vol% H2 as indicated by a premature development of the flame within the nozzle of the main fuel burner. NOx emissions are shown to progressively rise with increasing hydrogen content up to 60vol% but reduce as the hydrogen content increases to 70vol%. The decrease appears to be related to an improvement in the quality of fuel-air mixing. It is important to note that the apparent rate of increase in NOx with increasing hydrogen is dependent on the reporting approach used. When reporting conventionally (parts per million by volume corrected to 15% O2 on a dry basis) the increase is significantly greater than when reporting on a mass per fuel energy input basis (gram per Joule). Reporting in the conventional manner disadvantages hydrogen because of the impact of oxygen consumption and water production on the corrections.

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Section: Burner Under Investigation and Methodologymentioning

confidence: 99%

“…Wiranegara et al [19] generated the mesh using ICEM-CFD. A combination of tetrahedral and hexahedral meshes was used due to the complexity of the geometry in parts.…”

Section: Burner Under Investigation and Methodologymentioning

confidence: 99%