Effect of CO2 dilution on structures of premixed syngas/air flames in a gas turbine model combustor

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2023-09-01 DOI:10.1016/j.combustflame.2023.112912

F. Pignatelli , S. Derafshzan , D. Sanned , N. Papafilippou , R.Z. Szasz , M.A. Chishty , P. Petersson , X.-S. Bai , R. Gebart , A. Ehn , M. Richter , D. Lörstad , A.A. Subash

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引用次数: 0

Abstract

The impact of CO $_{2}$ dilution on combustion of syngas (a mixture of H $_{2}$ , CO, and CH $_{4}$ ) was investigated in a lab-scale gas turbine model combustor at atmospheric pressure conditions. Two mild dilution levels of CO $_{2}$ , corresponding to 15% and 34% of CO $_{2}$ mole fraction in the syngas/CO $_{2}$ mixtures, were experimentally investigated to evaluate the effects of CO $_{2}$ dilution on the flame structures and the emissions of CO and NO $x$ . All experiments were performed at a constant Reynolds number (Re = 10000). High-speed flame luminescence, simultaneous planar laser-induced fluorescence (PLIF) measurements of the OH radicals and particle image velocimetry (PIV) were employed for qualitative and quantitative assessment of the resulting flame and flow structures. The main findings are: (a) the operability range of the syngas flames is significantly affected by the CO $_{2}$ dilution, with both the lean blowoff (LBO) limit and the flashback limit shifting towards fuel-richer conditions as the CO $_{2}$ dilution increases; (b) syngas flames exhibit flame-pocket structures with chemical reactions taking place in isolated pockets surrounded by non-reacting fuel/air mixture; (c) the inner recirculation zone tends to move closer to the burner axis at high CO $_{2}$ dilution, and (d) the NO $x$ emission becomes significantly lower with increasing CO $_{2}$ dilution while the CO emission exhibits the opposite trend. The flame-pocket structure is more significant with increased CO $_{2}$ dilution level. The low NO $x$ emissions and high CO emissions are the results of the flame-pocket structures.

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CO2稀释对燃气轮机模型燃烧室混合气/空气火焰结构的影响

在常压条件下，在实验室规模的燃气轮机模型燃烧室中研究了CO2稀释对合成气(H2、CO和CH4的混合物)燃烧的影响。实验研究了两种轻度稀释水平的CO2，对应于合成气/CO2混合物中CO2摩尔分数的15%和34%，以评估CO2稀释对火焰结构和CO和NOx排放的影响。所有实验均在恒定雷诺数(Re = 10000)下进行。采用高速火焰发光、同时平面激光诱导荧光(PLIF)测量OH自由基和粒子图像测速(PIV)对所得火焰和流动结构进行定性和定量评估。研究结果表明:(a)合成气火焰的可操作性范围受CO2稀释度的显著影响，随着CO2稀释度的增加，贫吹极限和闪回极限都向燃料富集状态转移;(b)合成气火焰表现出火焰袋结构，化学反应发生在被不反应的燃料/空气混合物包围的孤立袋中;(c) CO2稀释度高时，内循环区有向燃烧器轴线靠近的趋势;(d)随着CO2稀释度的增加，NOx排放量显著降低，CO排放量呈相反趋势。随着CO2稀释水平的增加，火焰袋结构更为显著。低NOx排放和高CO排放是火焰袋结构的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.