Experimental study of NOx correlation for fuel staged combustion using lab-scale gas turbine combustor at high pressure

Han, Dong-Sik; Kim, Gyu-Bo; Kim, Han-Suk; Jeon, Chung-Hwan

doi:10.1016/j.expthermflusci.2014.05.016

Cited by 24 publications

(8 citation statements)

References 24 publications

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“…Swirl and high-pressure operations are widespread applications in the gas turbine industry. Swirl not only contributes to the enhanced mixing of fuel and oxidants but also promotes flame stability and reduces pollutant emissions, while a high-pressure operation has a significant impact on the heat-mass diffusion, flame propagation speed, adiabatic flame temperature, a unit’s single-cycle thermal efficiency, and the pollutant formation mechanism in turbulent flames. − For instance, research on the flame dimensions and pollutant emissions of high-pressure non-premixed swirl combustion was carried out by Xi et al , with experimental measurements, numerical simulations, and theoretical calculations. Yilmaz and Yilmaz performed an experimental study of a pre-mixed syngas combustion profile in a variable geometric swirl number chamber, which indicated the dominant effect of a swirl number on a flashback limit and the non-monotonic evolution of the blow-off and flashback equivalence ratios.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Yuan

et al. 2021

ACS Omega

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The C 1ε = 1.6 standard k – ε equation combined with the steady flamelet model was applied to a methane/dimethyl ether swirl combustion field, and the effects of the dimethyl ether (DME) blending ratio and operating pressure on the flame behavior, including species variation, reaction zone behavior, and flame entrainment, were investigated. The results demonstrated that selected models could better reproduce the trends of the experimental measurements. The downstream reaction zone achieved better calculation accuracy than the outer shear layer of the first recirculation zone. The addition of DME accelerated the accumulation process of H 2 , O, H, and OH radicals. The intermediate radical CH 2 O was rapidly developed by the influence of the H extraction rate under a constant fuel volume flow rate. The reaction zone dimensions were approximately linearly and positively correlated with the DME blending ratio, whereas flame entrainment expressed a lower DME concentration dependence in the high-DME mass-dominated system. The operating pressure significantly impacted the distribution of reactive radicals in the turbulent flame; meanwhile, the flame and reaction zone length showed nonlinear inverse behavior with pressure variation, while the thickness of the reaction zone was always linearly and negatively correlated with pressure. Moreover, the peak flame entrainment rate also experienced a nonlinear decline with pressure elevation; however, the peak positions were not sensitive to pressure fluctuation. Concurrently, the response surface functions for the reaction zone dimensions were established covering the range of 0–1 for the DME blending ratio and 1–5 atm operating pressure, which could provide assistance for combustion condition optimization and combustion chamber design.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Yuan

et al. 2021

ACS Omega

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“…However, owing to experimental difficulties, combustor measurement data under high pressures is extremely limited [3,[5][6][7]. The vast majority of combustion tests were carried out at low pressure levels, and the results obtained then extrapolated to higher pressure levels.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of combustion temperature on NO x is considered by the inclusion of the fuel to air ratio f far . Recently, several correlations were obtained for specific industrial combustors: a correlation for a model combustor of an aero gas turbine by Li et al [28], a correlation for fuel staged combustion employing laboratory-scale gas turbine combustor by Han et al [7], and another correlation for a 10 MW non-premixed gas turbine combustor utilizing high hydrogen fuels by Kroniger and Wirsum [29].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

et al. 2018

Energies

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The behavior of the pollutants NO and CO at elevated combustor pressure are of special importance due to the continuing trend toward developing engines operating at higher pressure ratios to yield higher thermal efficiency. An experiment was performed to examine the NO and CO emissions for a swirl convergent-divergent nozzle at elevated pressure. The NO and CO correlations were obtained. Meanwhile, the flame length, exhaust gas oxygen concentration, exit temperature and global flame residence time were also determined to analyze the NO and CO emission characteristics. The results showed that, with the increase in combustor pressure P, flame length decreased proportionally to P −0.49 ; exit O 2 volume fraction increased and exit temperature was reduced. The global flame residence time decreased proportionally to P −0.43. As pressure increased, the NO and Emission Index of NO (EINO) levels decreased proportionally to P −0.53 and P −0.6 respectively, which is mainly attributed to the influence of global flame residence time; the NO and EINO increased almost proportionally with the increase in global flame residence time. The EINO scaling EINO (ρu e /d) was proportional to Fr 0.42 , which indicated that compared with pure fuel, the fuel diluted with primary air can cause a decrease in the exponent of the Fr power function. At higher pressure, the CO and Emission Index of CO (EICO) decreased proportionally to P −0.35 and P −0.4 , respectively, due to the increased unburned methane and high pressure which accelerated chemical reaction kinetics to promote the conversion of CO to CO 2 .

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“…Specific fuel consumption, turbine inlet temperature, exhaust gas temperature, and emission characteristics were investigated. NOx and CO emission were lowered for butanol-blends compared to those with Jet-A [13][14][15][16][17][18].…”

Section: -Introductionmentioning

confidence: 99%

Numerical Investigation on the Effect of Using Mixtures of Natural Gas and Aviation Fuel on Flame Characteristics of Swirl Gas Turbine Combustor

Farag¹,

Belal

Zeid³

2015

International Conference on Aerospace Sciences and Aviation Tec

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The present paper is directed to study aviation fuel combustion compared to that of natural gas in a gas turbine swirl Combustor. Finite-volume based CFD commercial package ANSYS Fluent 12 is used for the present investigation. The SST k-ω model is used to simulate turbulence. The non-premixed combustion model is used to simulate the reacting flow. Combustion of natural gas is sooty in nature. Thus, soot distribution in the combustor is investigated numerically using the two step soot model. Simple expressions for the soot formation and oxidation rates were employed. The radiation heat transfer equation was solved using the P-1 radiation model. The formation of thermal NO from molecular nitrogen was modeled and the prompt NO was also included in the computations. CFD modeling is validated against experimental temperature measurements for a swirl combustor when firing natural gas as referred to a previous paper. Using the SST-K-ω for predicting gas temperature distributions satisfy reasonable agreement with the experimental temperature measurements, except near the combustor upstream and in the vicinity of the combustor axis.

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Experimental study of NOx correlation for fuel staged combustion using lab-scale gas turbine combustor at high pressure

Cited by 24 publications

References 24 publications

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

Numerical Simulation of Turbulent Non-premixed Combustion Processes for Methane and Dimethyl Ether Binary Fuels

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

Numerical Investigation on the Effect of Using Mixtures of Natural Gas and Aviation Fuel on Flame Characteristics of Swirl Gas Turbine Combustor

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