Effects of hydrogen addition on the structure and pollutant emissions of a turbulent unconfined swirling flame

Rohani, Behzad; Saqr, Khalid M.

doi:10.1016/j.icheatmasstransfer.2012.03.020

Cited by 32 publications

(13 citation statements)

References 35 publications

(49 reference statements)

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“…Under the experimental conditions, the combustion flame considered is a turbulent diffusion flame. As the simplest “complete models” to predict the turbulent combustion reaction, the realizable k-ɛ model (rkɛ) is widely used in swirl turbulent combustion in the past few years 25,26 and it has been extensively validated for a wide range of flows.…”

Section: Numerical Model and Validationmentioning

confidence: 99%

Fuel prereforming and combustion characteristics study of chemically recuperated gas turbine

Liu

Zheng

Ren

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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The chemically recuperated gas turbine cycle testing platform was designed and built based on theoretical research and experimental study, which included the dual-stage flash evaporation, the diesel steam reformer, and the dual-fuel combustion system. In this paper, an experimental study on the oil (C7H16) prereforming performance is analyzed and the relative increment of the equivalent calorific value is 46.2%. Combustion characteristics are calculated with oil and reformed gas and the results show that main combustion zone temperature drops from 2280 to 1910 K, which leads the ultra-low NO emissions of 1.8 ppm. The flame is stable using reformed gas and the wall temperature is low, but the nonuniformity of outlet is relatively high. Thermal efficiency of combustion is more than 99% even at low load condition.

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Section: Numerical Model and Validationmentioning

confidence: 99%

Fuel prereforming and combustion characteristics study of chemically recuperated gas turbine

Liu

Zheng

Ren

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Since GRI3.0 mechanism includes 325 reactions and 53 species, it is superior to GRI 2.11 in terms of up-todate kinetics and accuracy; thus for developing the flamelet library, GRI3.0 mechanism was employed. Indeed, kinetics related to prompt NO calculation have been improved in this revision [41]. Fenimore NO formation occurs in fuel rich conditions and it was found that the prompt NO formation increases near equivalence ratio of 1.4 [44].…”

Section: Grid Independent Checkmentioning

confidence: 99%

Combustion of Biogas Released from Palm Oil Mill Effluent and the Effects of Hydrogen Enrichment on the Characteristics of the Biogas Flame

Hosseini

Bagheri

Khaleghi

et al. 2015

Journal of Combustion

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Biogas released from palm oil mill effluent (POME) could be a source of air pollution, which has illustrated negative effects on the global warming. To protect the environment from toxic emissions and use the energy of POME biogas, POME is conducted to the closed digestion systems and released biogas is captured. Since POME biogas upgrading is a complicated process, it is not economical and thus new combustion techniques should be examined. In this paper, POME biogas (40% CO2and 60% CH4) has been utilized as a fuel in a lab-scale furnace. A computational approach by standardk-εcombustion and turbulence model is applied. Hydrogen is added to the biogas components and the impacts of hydrogen enrichment on the temperature distribution, flame stability, and pollutant formation are studied. The results confirm that adding hydrogen to the POME biogas content could improve low calorific value (LCV) of biogas and increases the stability of the POME biogas flame. Indeed, the biogas flame length rises and distribution of the temperature within the chamber is uniform when hydrogen is added to the POME biogas composition. Compared to the pure biogas combustion, thermal NOxformation increases in hydrogen-enriched POME biogas combustion due to the enhancement of the furnace temperature.

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“…They found that the C var number was an effective factor that affected the local extinction phenomenon in the steady flamelet model (SFM). A dynamic second-order moment closure combustion model of LES was validated with a CH 4 swirl flame (SM1) by Luo et al, 28 Kashir et al, 29 and Rohani and Saqr 30 numerically presented the combustion characteristics for adding H 2 and varying swirl numbers in the SM1 flame. A conditional moment closure (CMC) model was used by Roy and Sreedhara 31 to evaluate the flame structure and global NO emissions of CH 4 and DME in an exhaust gas recirculation (EGR) environment.…”

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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Effects of hydrogen addition on the structure and pollutant emissions of a turbulent unconfined swirling flame

Cited by 32 publications

References 35 publications

Fuel prereforming and combustion characteristics study of chemically recuperated gas turbine

Fuel prereforming and combustion characteristics study of chemically recuperated gas turbine

Combustion of Biogas Released from Palm Oil Mill Effluent and the Effects of Hydrogen Enrichment on the Characteristics of the Biogas Flame

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

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