Oxy-fuel combustion of methane in a swirl tubular flame burner under various oxygen contents: Operation limits and combustion instability

Li, Bo; Shi, Baolu; Zhao, Xiaoyao; Ma, Kang; Xie, Dingjiang; Zhao, Dan; Li, Junwei

doi:10.1016/j.expthermflusci.2017.09.001

Cited by 77 publications

(33 citation statements)

References 29 publications

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“…This phenomenon is different from the high frequency thermoacoustic oscillation occurred in premixed propane/air tubular flame [5], and partially premixed oxy-methane [18] and hydrogen/air swirl flames [17].…”

Section: Effects Of Acoustic Frequency F0mentioning

confidence: 58%

“…In the premixed propane/air combustion under large flow rates (over 600 m 3 /h) [5], high frequency oscillations were observed, which were identified as the tangential/radial mode acoustic resonant oscillations. In the hydrogen/air combustion [17] as well as lean oxy-fuel combustion of methane [3,18] and propane [19] under high oxygen concentrations (above 0.6), the observed high frequency oscillations were recognized as the axial mode acoustic resonant oscillations. Such instability phenomena severely limit the application of tubular flame to the aforementioned emission reduction, power generation, and flame synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the flame may be susceptible to external perturbations, especially in the direction perpendicular to the tangential jets, i.e., longitudinal excitations. Such a response is of significant interest to predict the flame stability at extreme conditions, such as ultra-lean burning, or pure oxygen combustion with ultrahigh heat release rate [18,19]. Hence, by axially introducing acoustic perturbations, this study experimentally investigated the characteristics of methane/air The high-purity methane and dry air supplied by cylinders were well-premixed and then injected into the combustor through the tangential slits.…”

Section: Introductionmentioning

confidence: 99%

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Response of lean premixed swirl tubular flame to acoustic perturbations

Zhao

et al. 2020

Experimental Thermal and Fluid Science

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This study experimentally examined the response of a lean premixed methane/air swirl tubular flame to the longitudinal acoustic perturbations. Experiments were conducted by varying the acoustic frequency (f0), acoustic power (P0) and inlet air flow rate (QA) to systematically study the acoustic-excited flame dynamics, including the flame stability, flame structure, heat release rate and acoustic pressure fluctuations. The results demonstrated that the lean tubular flame was much sensitive to longitudinal perturbations below 210 Hz. Even at low power of P0, the flame was forced to oscillate intensively when the perturbation was operated in two discontinuous frequency ranges of f0 = 150-200 and f0 = 50-100 Hz, while a weakened oscillation regime was observed in the middle range of f0 =100-150 Hz; a lower frequency (less than 50 Hz) would extinguish the flame. An increase in P0 intensified the flame oscillation under the perturbations of 50-100 Hz, and even resulted in flame lift-off and blow off with f0 between 150 and 200 Hz. In comparison to f0 and P0, the effects of air flow rate (QA) seemed to be weaker. The proper orthogonal decomposition (POD) analysis was performed to interpret the contributions from the mean mode and fluctuating axial and circumferential modes that led to combustion instability. It was found that as the energy fraction of the axial mode exceeded 5.0%, the flame lift-off appeared in the lean swirl tubular configuration.

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Section: Effects Of Acoustic Frequency F0mentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Response of lean premixed swirl tubular flame to acoustic perturbations

Zhao

et al. 2020

Experimental Thermal and Fluid Science

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“…This method is also a promising method for eliminating NOx emissions (Andersson & Johnsson, 2006Habib et al, 2017). The combustion process using CFD (Al-Abbas et al, 2011) is a very important process, since the investigation of the combustion reaction mechanisms and the emission model are very important for accurate prediction of the combustion characteristics (Ditaranto & Oppelt, 2011;Khalil & Gupta, 2017a;Khalil & Gupta, 2017b;Kim et al, 2007;Li, Shi et al, 2018;Smith et al, 1999). However, taking into account the entire combustion process in modeling is currently very resource-intensive and a set of simplified chemical mechanisms is usually used to reduce computational efforts (Andersen et al, 2009;Frassoldati et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

A numerical study for the assessment of air pollutant dispersion with chemical reactions from a thermal power plant

Issakhov

Alimbek

Issakhov

2020

Engineering Applications of Computational Fluid Mechanics

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In this work, a computational simulation of the pollutants spread generated during fuel combustion at Ekibastuz SDPP-1 and their chemical reaction in the atmosphere have been presented. Using the example of a real thermal power plant (Ekibastuz SDPP-1), the dispersion NO, NO 2 , CO and products NO 2 , HNO 3 , CO 2 during a chemical reaction with oxygen was modeled. The numerical method was verified by solving three test problems and the received computational solutions were compared with data from the measurement and the computational data of other authors. The purpose of the work was to investigate the pollution level at various ranges from the source. As a result, the mass fraction of the concentration and product during a chemical reaction were determined. According to the obtained data, with increasing distance from the source, the concentration of pollution spreads more widely under the influence of diffusion. The farther the distance from the chimney, the lower the concentration of the substance and products. Thus, the obtained computational values may allow in the future predicting the optimal distance from residential areas for the construction of thermal power plants, at which the concentration of emissions will remain at a safe level.

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“…2017, Imteyaz et at. 2018and Li et al 2018). These might make ame burning an ideal method for tail gas treatment.…”

Section: Introductionmentioning

confidence: 99%

Study on Pure Oxygen Exhaust Gas Combustion: Key Technology of CO2 Capture for High Temperature Fuel Cell With Coal Syngas

Wang

Lei

et al. 2020

Preprint

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IGFC based on high temperature SOFC coupled with CO2 capture process provides a new technology route of high efficiency and nearly zero CO2 emission power system. Flame burning is an ideal method for tail gas treatment. In this paper, an oxy-combustor for a 10kW IGFC system anode exhaust gas is experimentally and numerically studied. Simulation method is verified by experiments. Key performances of the combustor are studied under different system process design conditions. 315K might be an ideal condensation temperature before burning for flame stability. CO could be almost fully converted under flame burning condition.CO2 concentration after burning is over 0.958 when excess O2 is less than 5%. Overall,5% excess O2 could be recommended for environment consideration. An optimal tangential angle exists around 25°for liner temperature controlling.Systems with anode cycling might release less CO pollutant in theory for no addition of extra H2O. Total fuel utilization percent had better be high enough to make oxygen flame temperature of anode exhaust gas lower than 1800K to make systems environment friendly.The results would be of great value to IGFC and CO2 capture combined system designing.

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Oxy-fuel combustion of methane in a swirl tubular flame burner under various oxygen contents: Operation limits and combustion instability

Cited by 77 publications

References 29 publications

Response of lean premixed swirl tubular flame to acoustic perturbations

Response of lean premixed swirl tubular flame to acoustic perturbations

A numerical study for the assessment of air pollutant dispersion with chemical reactions from a thermal power plant

Study on Pure Oxygen Exhaust Gas Combustion: Key Technology of CO2 Capture for High Temperature Fuel Cell With Coal Syngas

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