Impact of gas composition variations on flame blowout and spectroscopic characteristics of lean premixed swirl flames

Chong, Cheng Tung; Ng, Jo-Han; Aris, Mohd Shiraz; Mong, Guo Ren; Shahril, Norshakina; Ting, Sing Tung; Zulkifli, Meor Faisal

doi:10.1016/j.psep.2019.05.015

Cited by 13 publications

(22 citation statements)

References 22 publications

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“…Lean premixed combustion can achieve higher thermal efficiency and lower NO x emission levels [8,13]. This technology is widely used in land-based power generation gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the premixed syngas swirl flames in a model combustor

Samiran

Chong

et al. 2019

International Journal of Hydrogen Energy

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Experimental and numerical investigations were performed to study the combustion characteristics of synthesis gas (syngas) under premixed swirling flame mode. Four different type of syngases, ranging from low to high H 2 content were tested and simulated. The global flame structures and post emission results were obtained from experimental work, providing the basis of validation for simulations using flamelet generated manifold (FGM) modelling approach via a commercial computational fluid dynamic software. The FGM method was shown to provide reasonable agreement with experimental result, in particular the post-exhaust emissions and global flame shapes. Subsequently, the FGM method was adopted to model the flame structure and predict the radical species in the reaction zones. Simulation result shows that H 2enriched syngas has lower peak flame temperature with lesser NO species formed in the reaction zone.

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“…Lean premixed combustion can achieve higher thermal efficiency and lower NO x emission levels [8,13]. This technology is widely used in land-based power generation gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the premixed syngas swirl flames in a model combustor

Samiran

Chong

et al. 2019

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

“…The gas turbine (GT) is a technology that is relatively adaptable in terms of accepting variations in the quality of the gaseous fuel that it uses [1]. However, a GT constructed and calibrated to run on a specified fuel quality range will always prefer to operate within the tolerance limitations in exchange for reliability and the highest feasible operational efficiency [1]. With that being said, GTs can only withstand minor changes in fuel compositions, depending on the GT design and the configuration of the hardware and controls, and must be configured for a certain fuel composition range [2].…”

Section: Introductionmentioning

confidence: 99%

“…With that being said, GTs can only withstand minor changes in fuel compositions, depending on the GT design and the configuration of the hardware and controls, and must be configured for a certain fuel composition range [2]. The combustion characteristics of a GT combustor are sensitive to the quality of natural gas (NG) delivered by the upstream gas pipeline network [1]. The sensitivity to gas quality is noticeably more apparent in modern dry low NOx (DLN) combustors [1].…”

Section: Introductionmentioning

confidence: 99%

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Reacting Flow Characteristics and Multifuel Capabilities of a Multi-Nozzle Dry Low NOx Combustor: A Numerical Analysis

Rahman

Yasin

Aris

2021

CFDL

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The fluctuating quality of natural gas (NG) in Peninsular Malaysia (PM) makes it challenging for the gas turbine (GT) combustor to meet the combustion performance requirements from the Original Equipment Manufacturer (OEM). Moreover, the gas quality sensitivity is more apparent in modern dry low NOx (DLN) combustors. Many of the prior combustion investigations were conducted on a modest scale in the laboratory. In actuality, combustion characterizations in complicated DLN combustors are more valuable to the power generation sector. Hence, the current numerical analysis utilized the RANS formulation and a detailed chemistry to examine the impact of ethane (C2H6), carbon dioxide (CO2), and nitrogen (N2) proportions in NG on combustion characteristics in a multi-nozzle DLN (MN-DLN) combustor, with the support of Modified Wobbe Index (MWI) calculations. Validations were performed using the combustor outlet temperature (COT) from the power plant where the actual MN-DLN combustor is operated, which revealed less than 10 % discrepancy. Qualitative validations were carried out by comparing the burn trace from the actual combustor wall to the predicted results, revealing an adequate Structural Similarity Index (SSIM) of 0.43. From numerical results of flame fronts and COTs, the addition of 20 % diluents (CO2 and N2) to NG demonstrated the blowoff risk. When MWIs of Kerteh and the JDA (major NG resources) were used as baselines, MWI ranges of all NG compositions under study surpassed the OEM’s ± 5 % limit. The increase in CO2 proportion results in a wide MWI range, especially when Kerteh is used as the baseline. Therefore, any GTs in PM that have previously been calibrated to use Kerteh's NG are more likely to have combustion instabilities if CO2 levels in NG suddenly increase. The higher MWI range backs up the current numerical results that showed the deleterious effects of a high CO2 composition throughout the combustor firing process. However, increasing the amount of C2H6 by up to 20 % is predicted to have minor effects on combustion characteristics. Overall, the validated numerical model of the MN-DLN combustor provided critical information about combustion characteristics and multifuel capabilities in respect to the NG quality in PM.

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“…Natural gas consists of predominantly methane (86-96%) [20], hence for simplicity, the molecular weight of natural gas is approximated as methane for the calculation of the fuel/air ratio [21].…”

Section: Introductionmentioning

confidence: 99%

Dual-Fuel Operation of Biodiesel and Natural Gas in a Model Gas Turbine Combustor

Chong

Chiong

et al. 2020

Energy Fuels

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The dual-fuel combustion characteristics of palm biodiesel/methyl esters (PME) and natural gas (NG) in a model gas turbine swirl flame burner is investigated. The PME is atomised into a spray, while the gaseous NG is premixed with the main bulk swirling air before entering the combustion chamber. The fuels are supplied to the burner outlet at the PME:NG ratio of 90:10, 80:20 and 70:30 by mass. The preheated NG/air mixture flow passes through an axial swirler before mixing with the liquid fuel spray at the burner outlet for ignition. The dualfuel flames are compared with the baseline single fuel operation at the same thermal power output to assess the flame spectroscopic and emissions characteristics. The dual-fuel PME/NG flame structure is similar to the PME, where the sooty flame brush is noticeably absent. The PME and PME/NG flames emit higher peak intensity of OH* and CH* radicals as compared to diesel at the same equivalence ratio. Dual fuel operation results in lower NO but higher CO at  = 0.9 as compared to pure diesel and PME spray flames. The higher CO emission level for dual-fuel is attributed to poor mixing and incomplete combustion as a result of reduced air flow. At leaner operation of  = 0.65, enhanced turbulence due to higher bulk air flow results in improved mixing, lowering the overall CO but increasing the NO emissions due to the more intense flame core. The study shows that optimisation of the multiphase dual-fuel injection system is needed to achieve low emissions in a gas turbine combustor.

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Impact of gas composition variations on flame blowout and spectroscopic characteristics of lean premixed swirl flames

Cited by 13 publications

References 22 publications

Experimental and numerical studies on the premixed syngas swirl flames in a model combustor

Experimental and numerical studies on the premixed syngas swirl flames in a model combustor

Reacting Flow Characteristics and Multifuel Capabilities of a Multi-Nozzle Dry Low NOx Combustor: A Numerical Analysis

Dual-Fuel Operation of Biodiesel and Natural Gas in a Model Gas Turbine Combustor

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