Evaluation, development, and validation of a new reduced mechanism for methane oxy-fuel combustion

Hu, Fan; Li, Pengfei; Guo, Junjun; Wang, Kai; Liu, Zhaohui; Chen, Zheng

doi:10.1016/j.ijggc.2018.08.018

Cited by 38 publications

(24 citation statements)

References 44 publications

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“…Figure 7 shows S L for a CH 4 /air flame and a CH 4 /CO 2 -A r -O 2 flame at a range of equivalence ratios. As far as the flame speed is concerned (the only parameter obtained from GRI-Mech 3.0 and used in this paper), its prediction was validated for oxyfuel combustion as reported by [28]. In addition, other studies [29][30][31][32] have used GRI-MECH 3.0 to predict laminar flame speed.…”

Section: Damköhler Number and Borghi Analysesmentioning

confidence: 93%

Planar Laser-Induced Fluorescence and Chemiluminescence Analyses of CO2-Argon-Steam Oxyfuel (CARSOXY) Combustion

et al. 2021

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Strict regulations and acts have been imposed to limit NOx and carbon emissions. The power generation industry has resorted to innovative techniques to overcome such a low level of tolerance. Amongst those in the literature, CO2-argon-steam oxyfuel (CARSOXY) gas turbines have theoretically been proven to offer an economically sustainable solution while retaining high efficiency. Although theoretical studies have characterized CARSOXY, no experimental evidence has been provided in the literature. Therefore, this paper attempts to experimentally assess CARSOXY in comparison to a CH4/air flame. OH* chemiluminescence integrated with OH Planar Laser-Induced Fluorescence (PLIF) imaging has been utilized to study flame stability and flame geometry (i.e., the area of highest heat intensity (AOH¯Max center of highest heat intensity (COH¯Max)) over a range of working fluid Reynolds’ numbers and oxidizing equivalence ratios. In addition, the standard deviation of heat release fluctuations (σOH*/OH¯) has been utilized as the base-criteria to compare the stability performance of CARSOXY to CH4/air combustion. Moreover, turbulence-chemistry interactions have been described using Damköhler numbers and by plotting Borghi regime diagrams. This paper suggests a modified numerical approach to estimate Damköhler numbers and plot regime diagrams for non-premixed combustion by utilizing the Buckingham π theorem based on experimental observations and results. CARSOXY flames showed lower flame intensity than that of the CH4/air flame throughout the entire Re interval by approximately 16%, indicating higher heat release. The Damköhler numbers of the CARSOXY flame were also greater than those of the CH4/air flame in all conditions, indicating more uniform CARSOXY flames. It was found that the tendency of the CARSOXY flame of approaching the concentrated reaction zone is greater than that of the CH4/air flame.

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Section: Damköhler Number and Borghi Analysesmentioning

confidence: 93%

Planar Laser-Induced Fluorescence and Chemiluminescence Analyses of CO2-Argon-Steam Oxyfuel (CARSOXY) Combustion

et al. 2021

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“…The computational domain is carried out strictly according to the experimental size. A detailed mechanism for methane 21 that contains the main species of CH 4 , O 2 , CH 3 , CH 2 , OH, CO, H 2 , CO 2 , and H 2 O is employed in this investigation. The calculation model has been verified in our previous works 16‐18 .…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Stabilization performances and mechanisms of a diffusion‐like vortex‐tube combustor foroxygen‐enrichedcombustion

et al. 2020

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Summary The stabilization performance and mechanisms in a diffusion‐like vortex‐tube combustor is investigated for oxygen‐enriched combustion. The stability limit, flame configuration, and pressure fluctuation are investigated under various conditions. Results show that a diffusion‐like flame structure is established in the combustor and the nonpremixed peculiarity becomes more prominent with the increase of oxygen mole fraction. The steady combustion can be achieved in the range of global equivalence ratio 0.01 to 1.0 with a low‐pressure fluctuation amplitude always less than 1300 Pa, indicating a good combustion stability of this combustor. Additionally, the stabilization mechanism is discussed from the time matching and velocity matching. Based on the axial fuel entry method, the Damköhler number (Da) is always less than 1.0 as a whole, which is the principal reason for the tubular flame shape and the steady combustion procedure in this vortex‐tube combustor. The intensified combustion under oxygen‐enriched combustion can increase the flame speed, and subsequently reduce the mixing quality and make the yellow flame more visible. Besides, the temperature distribution and the flow field structure can explain the corrugation and deformation of the flame front under oxygen‐enriched conditions.

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“…In oxy-fuel combustion method, the fuel is burned in oxygen instead of air (Dwivedi et al, 2018). The cooled flue gas is re-circulated and then injected into the combustion chamber to limit the resultant flame temperature up to the levels of conventional combustion (Hu et al, 2018). The flue gas consists of mainly carbon dioxide and water vapor, where the latter is condensed through cooling (Leffler et al, 2017).…”

Section: Oxy-fuel Combustionmentioning

confidence: 99%

System of Adsorption of CO2 in Coalbed

Klunk

Dasgupta

Das

et al. 2018

SBJC

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Carbon capture and storage (CCS) has been observed as an alternative measure to mitigate emissions from greenhouse gases. CCS systems separate CO2 during the process of converting fuel and transport to the facilities where they are stored, e.g., under geological formation conditions. Capture and sequestration technologies are now widely used in different industries. CO2 capture is currently a costly and energy-consuming technology. The costs obviously depend on the size of the plant and the type of fuel used. Generally, capture systems are categorized into three categories: pre-combustion, post-combustion, and oxy-fuel combustion. The saline aquifer, depleted oil, and gas fields are large-capacity storage sinks. The coalbeds also provide as a substitute to geological storage. One of the main advantages of coal storage is renewable methane fuel and coal desulfurization. The studied coal reserves are located in Candiota, State of Rio Grande do Sul, Brazil. These are the largest coal deposits in the country, with a reserve of 1 billion tons. This work will represent a study on CO2 storage in Candiota coalbed system. The use of a synthetic CO2 cylinder with a flow of 0.2 L /min varies the time of contact with the coalbed. The results from the volatile matter increase by 11%. The results of the ultimate analysis exhibited an 8% increase for carbon and oxygen after 60 minutes of CO2 flow in the coalbed. On the other hand, there was a reduction of 32% for sulfur. The resultant phenomena occur due to the adsorption capacity of CO2, where the compounds are released from the pores of coal

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Evaluation, development, and validation of a new reduced mechanism for methane oxy-fuel combustion

Cited by 38 publications

References 44 publications

Planar Laser-Induced Fluorescence and Chemiluminescence Analyses of CO2-Argon-Steam Oxyfuel (CARSOXY) Combustion

Planar Laser-Induced Fluorescence and Chemiluminescence Analyses of CO2-Argon-Steam Oxyfuel (CARSOXY) Combustion

Stabilization performances and mechanisms of a diffusion‐like vortex‐tube combustor foroxygen‐enrichedcombustion

System of Adsorption of CO2 in Coalbed

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