Experiment study on the combustion performance of hydrogen-enriched natural gas in a DLE burner

Ge, Bing; Ji, Yongbin; Zhang, Zilai; Zang, Shusheng; Tian, Ye; Yu, Hai; Chen, Mingmin; Jiao, Guangyun; Zhang, Dongfang

doi:10.1016/j.ijhydene.2019.03.257

Cited by 40 publications

(17 citation statements)

References 17 publications

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“…The unforced flames were first generated by setting β = 0 across η H = [0 : 0.2 : 0.8]. These plots are shown in Figure 3, and show that the axial flame length decreases as η H is increased, supporting numerous experimental observations [52]. Subsequently, forcing was introduced.…”

Section: Numerical Solution Methodssupporting

confidence: 67%

The effect of hydrogen enrichment on the forced response of CH4/H2/Air laminar flames

Lim,

Li,

Morgans

2021

Preprint

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Hydrogen-enrichment of conventional natural gas mixtures is an activelyexplored strategy for reducing pollutant emissions from combustion. This study investigates the effect of hydrogen enrichment on the unsteady flame response to perturbations, with a view to understanding the implications for thermoacoustic stability. The Level Set Approach for kinematically tracking the flame front was applied to a laminar conical premixed methane / hydrogen / air flame subjected to 2D incompressible velocity perturbations. For hydrogen enrichment levels ranging from 0% to 80% by volume, the resulting unsteady heat release rate of the flame was used to generate the Flame Describing Functions (FDFs). This was performed across a range of perturbation frequencies and levels at ambient pressure. The mean heat release rate of the flame was fixed at Q = 2.69 kW and the equivalence ratio was set to ϕ = 1.08 for all hydrogen enrichment levels. Hydrogen-enrichment was found to shift the FDF gain drop-off to higher frequencies, which will increase propensity to thermoacoustic instability. It also reduced the effective flame time delay. Sensitivity analyses at ϕ = 0.8 revealed that the changes in FDF were driven predominantly by the flame burning speed, and were insensitive to changes in Markstein length.

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Section: Numerical Solution Methodssupporting

confidence: 67%

The effect of hydrogen enrichment on the forced response of CH4/H2/Air laminar flames

Lim,

Li,

Morgans

2021

Preprint

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“…They also noted, however, that the M-shaped hydrogen flames could still couple with higher frequency modes of the combustor. In contrast to the aforementioned studies, experimental work by Ge et al [80] found that hydrogen-enrichment resulted in a transition from an unstable M-shaped flame to a stable V-shaped flame. The researchers investigated the combustion performance of hydrogen-enriched natural gas at atmospheric pressure conditions using a radially staged, partially-premixed DLE burner with both main and pilot fuel streams operational.…”

Section: Effect On Flame Structure and Flame Positionmentioning

confidence: 85%

Thermoacoustic Instability Considerations for High Hydrogen Combustion in Lean Premixed Gas Turbine Combustors: A Review

et al. 2021

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Hydrogen is receiving increasing attention as a versatile energy vector to help accelerate the transition to a decarbonised energy future. Gas turbines will continue to play a critical role in providing grid stability and resilience in future low-carbon power systems; however, it is recognised that this role is contingent upon achieving increased thermal efficiencies and the ability to operate on carbon-neutral fuels such as hydrogen. An important consideration in the development of gas turbine combustors capable of operating with pure hydrogen or hydrogen-enriched natural gas are the significant changes in thermoacoustic instability characteristics associated with burning these fuels. This article provides a review of the effects of burning hydrogen on combustion dynamics with focus on swirl-stabilised lean-premixed combustors. Experimental and numerical evidence suggests hydrogen can have either a stabilising or destabilising impact on the dynamic state of a combustor through its influence particularly on flame structure and flame position. Other operational considerations such as the effect of elevated pressure and piloting on combustion dynamics as well as recent developments in micromix burner technology for 100% hydrogen combustion have also been discussed. The insights provided in this review will aid the development of instability mitigation strategies for high hydrogen combustion.

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“…Hydrogen injection into conventional gas fuels reduces heat release oscillations and improves flame stability [20][21][22], while enhancing turbulent explosion parameters [21]. It has, indeed, been noticed that with 5% hydrogen, the flame expands greatly, inhibiting combustion instability [23]. All studies highlight that hydrogen concentration is a crucial parameter in all flammability and combustion characteristics [24].…”

Section: Introductionmentioning

confidence: 90%

Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems

et al. 2021

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Biogas is a renewable gas with low heat energy, which makes it extremely difficult to use as fuel in conventional natural gas equipment. Nonetheless, the use of hydrogen as a biogas additive has proven to have a beneficial effect on flame stability and combustion behavior. This study evaluates the biogas–hydrogen combustion in a conventional natural gas burner able to work up to 100 kW. Tests were performed for three different compositions of biogas: BG70 (30% CO2), BG60 (40% CO2), and BG50 (50% CO2). To achieve better flame stability, each biogas was enriched with hydrogen from 5% to 25%. The difficulty of burning biogas in conventional systems was proven, as the burner does not ignite when the biogas composition contains more than 40% of CO2. The best improvements were obtained at 5% hydrogen composition since the exhaust gas temperature and, thus, the enthalpy, rises by 80% for BG70 and 65% for BG60. The stability map reveals that pure biogas combustion is unstable in BG70 and BG60; when the CO2 content is 50%, ignition is inhibited. The properties change slightly when the hydrogen concentrations are more than 20% in the fuel gas and do not necessarily improve.

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Experiment study on the combustion performance of hydrogen-enriched natural gas in a DLE burner

Cited by 40 publications

References 17 publications

The effect of hydrogen enrichment on the forced response of CH4/H2/Air laminar flames

The effect of hydrogen enrichment on the forced response of CH4/H2/Air laminar flames

Thermoacoustic Instability Considerations for High Hydrogen Combustion in Lean Premixed Gas Turbine Combustors: A Review

Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems

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